Creep-resistant aluminium alloy for multilayer tubes

FIELD: metallurgy.

SUBSTANCE: invention relates to articles made from aluminium alloy having high internal pressure resistance at high temperatures and can be used in multilayer tubes used as sanitary pipes or heating pipes. The multilayer tube has a tube wall comprising a core layer made from a rolled aluminium alloy product, and an inner and an outer layer made from plastic. The aluminium alloy in the core layer contains the following, wt %: Si from 0.2 to 1.4, Fe+Mn from 1.1 to 1.8, Cu from 0.15 to 0.5, Mg <0.2, Ti <0.2, Zn <1.5, impurities <0.05 each, total <0.2, and the balance being aluminium.

EFFECT: longer service life of flexible multilayer tubes.

13 cl, 1 dwg, 4 tbl, 1 ex

 

The technical field to which the invention relates

The invention relates to a product made of aluminum alloy with low creep, in particular to multilayer pipes. More specifically, the present invention relates to an aluminum alloy with high resistance to fracture creep (long durability), i.e. high resistance to the internal pressure at elevated temperature. Therefore, this aluminum alloy is particularly suitable for use in multilayer pipes, which can be used as plumbing pipes, heating pipes, etc. in installations of buildings. The invention also relates to a multilayer tube having inner and outer layers, made of plastic (polymer), and a core layer made of an aluminum alloy (so-called metal-plastic pipes), as well as to a method for manufacturing products from such aluminum alloy and the use of such aluminum alloy in multilayer pipes.

Background of the invention

In the description below, in the absence of other indications, designations of alloys and status designations are in accordance with designations of the Aluminum Association (Aluminum Association) Standards and data on aluminium and registration data (Aluminum Standards and Data and the Designation Records), published by the Aluminum Association the 2006

Unless otherwise stated, for any description of alloy compositions or preferred alloy compositions, all references to percentages are given in percent by mass.

Multilayer pipes, consisting of a conjunction of extruded polyethylene or polypropylene pipes with metal core, have found numerous applications in the construction industry, such as plumbing pipes, heating pipes, gas pipes, etc. as well as in other industries, such as pharmaceutical, chemical or food industry. Compared with plastic pipes, multilayer pipes, having a core layer of aluminum alloy that is impervious to oxygen, have high strength and heat resistance, and low coefficient of expansion. Such multilayer pipes are easy to install because they can be bent and cut to the desired length on site. They are also preferred in relation to pipes made from metal, as plastic inner and outer layers improve corrosion resistance and serve as a noise barrier. They also give savings in weight and have better formability.

Such multilayer pipes have an outer plastic layer, the inner plastic layer and the aluminum layer of the core d is I the mechanical strength and long-term operation. The inner and outer plastic layers are typically associated with aluminum core through the outer and inner adhesive layer, respectively.

The most critical property of multilayer pipes with their applications in heating systems and sanitary-technical equipment is resistant to permanent and current a long time the internal pressure at elevated temperatures. It is usually checked by means of standardized tests internal pressure ASTM-F1281, ASTM-F1282 or DVGW W542, during which the tube is maintained at 30 bar and 95°C prior to its destruction. From time to fracture is possible to extrapolate the expected service life of the pipe when the conditions encountered, for example, in the sanitary system of the building, i.e. a temperature of 70°C at 20 bar. High resistance to current a long time the internal pressure is especially important if the metal layer of the core must be kept thin as possible and in the case of pipes with large diameters.

Aluminum alloys currently used as a core layer in multilayer pipes are aluminum alloys series AA and AA.

Aluminum alloy AA has the following chemical composition in wt.%:

Si <0,6
Fe<0,7
Cufrom 0.05 to 0.20
Mnfrom 1.0 to 1.5
Zn<0,10
impurities<0.05 for each,
just <0,15,
aluminumrest

This aluminum alloy has been used previously in multilayer pipes, because it is relatively inexpensive and has sufficient strength. However, it shows not enough good results when tested on prolonged exposure to pressure.

In EP-1323839-A1 described aluminum hard solder, suitable as the material of the sheets in the roll having the following composition in wt.%: Si from 0.7 to 1.2, Mn from 0.7 to 1.2, Mg <0,2, Fe <0.8, the Zn <3,0, Ni <1,5, Cu <0.5, and optionally one or more elements selected from the group comprising (Ti <0,20, In <0,20, Zr <0,25, V <0.25 in, Sn <0,25, Cr <0,25), impurities <0.05 for each, just <0,15, the rest is aluminum. This composition was chosen due to its improved to 0.2%final conditional yield strength after brazing compared to traditional hard alloys. This aluminum alloy has good corrosion resistance and elevated stage the RCM of impurity elements. The resistance of this alloy to the current a long time the pressure required for welded multilayer pipes, not tested and were not considered.

There is therefore a need for an aluminum alloy for use in multilayer pipes, which has increased resistance to permanent and current a long time the internal pressure, ideally at a high temperature component, for example, 95°C.

Description of the invention

The purpose of the present invention is to offer a product made of aluminum alloy with high resistance to current a long time the internal pressure compared to conventional aluminum alloys used in multilayer pipes. Another objective of the present invention is to provide an improved multi-layer tube having made of plastic outer and inner layers and is made of aluminum alloy layer of the core.

These and other objectives and additional advantages are achieved or exceeded by the present invention, in which the proposed product is made of aluminum alloy, ideally in the form of rolled products for welded pipes, such aluminum alloy contains, in wt.%:

Siabout the 0,2 to 1,4
Fe+Mnfrom 1.1 to 1.8
Cufrom 0.15 to 0.5
Mg<0,20
Ti<0,20
Zn<1,5

and other impurities or incidental elements <0.05 for each, just <0.2 and the rest is aluminum.

Such aluminum alloy showed excellent resistance to current a long time pressure, because it has not collapsed in the creep testing ASTM-F1281 after more than 100 hours at 95°C. and the internal pressure of 30 bar. This aluminum alloy also has considerable tolerance to impurities. For purposes of this invention, the product of this aluminum alloy has no metallic layers.

The present invention also found that the creep can be minimized, and therefore, significantly increased resistance to current a long time the pressure, if the grain size is small and a large number of elements present in solid solution.

Compared with the alloy AA the content of Si may be relatively high in order to achieve the desired resistance to creep. The preferred lower limit of the content of Si which leaves approximately 0.85%, to and more preferred is 0.95 percent.

However, the content of Si should not be too high, so that the solidus was not too much reduced and was still possible to homogenization to reduce the final size of the grains. This serves to minimize creep, as well as increasing formemost products and, therefore, flexion artificial multilayer pipes with the core layer made from such products of aluminum alloy. Therefore, the upper limit for Si is 1.4%, preferably 1.2%, and more preferably of 1.05%. Requirements for weldability can also affect the choice of a particular Si content.

The content of Cu is also higher compared with the alloy A and serves to improve the resistance to current a long time pressure. It is well known that Cu reduces corrosion resistance. However, this does not pose a threat to the present invention, as the product of the aluminum alloy is preferably used as the core layer in the multilayer pipe and therefore will be protected from corrosion inner and outer plastic layers. The lower limit for Cu is 0.15%, and more preferably about 0.20 per cent, and the upper limit is preferably of 0.30%.

Fe and Mn are also supported at a relatively high level, namely at least 1.1 percent, but not too high to avoid PR is devrekani crystallization of large particles during casting, therefore, the sum of Fe and Mn should be limited to 1.8%. The exact content of Fe and Mn picked based on the requirements of a particular application to formemost, corrosion resistance and weldability.

In one embodiment, the Fe and Mn content of Fe is, for example, in the range from 0.20 to 0.8%, and preferably in the range from 0.30 to 0.45%. With the high Fe content of Mn is preferably in the range from 0.7 to 1.15%, and more preferably in the range from 0.90 to 1.15%. A more preferable upper limit of the Mn content is 1.10%.

In another embodiment, Fe and Mn content of Fe is in the range from 0.90 to 1.30%, and preferably in the range from 0.90 to 1.20%, while the content of Mn is preferably in the range from 0.20 to 0.50%, and preferably in the range from 0.30 to 0.50%.

Mg can also be added in order to improve such properties of aluminum alloy, as elongation at break and tensile strength, and its content should be less than 0.2%. The Mg content is preferably in the range from 0.05 to 0.10%.

Ti can also be added to improve strength and corrosion resistance and is preferably in quantities of from 0.11 to 0.16%.

Pb and Bi may also be present as impurity elements. The upper limit on the amount of Pb+Bi is preferably lt; to 0.05%, and more preferably <0,02%.

The content of Zn is substantially less than known from the prior art aluminum solid solder described in EP-1323839-A1. The present invention provides an upper limit of 1.5%, preferably 0.50%, more preferably of 0.20%.

Zr is preferably not added to the aluminum alloy according to the invention, but is present as an unavoidable impurity element at the level <0,05%and preferably <0,02%. Thus, the aluminum alloy may preferably be essentially free from Zr.

Cr is preferably not added to the aluminum alloy according to the invention, but is present as an unavoidable impurity element at the level <0,05%and preferably <0,02%. Thus, the aluminum alloy may preferably be essentially free from Cr.

According to another aspect of the invention it relates to a flexible multi-layer pipe having a core layer made of the above-described and claimed in the claims of aluminum alloy, is made of plastic inner layer and is made of plastic outer layer. The inner and/or outer layers are preferably made of polyethylene (PE), polypropylene or cross-linked polyethylene (PEX). Can also be used any other commercially available plastics (plastics)suitable for use is of flexible pipes. The range of thickness of the aluminum alloy core is usually from about 0.1 to 1.0 mm, preferably from about 0.15 to 0.6 mm For the purposes of this invention the product of the aluminum alloy has no metallic layers; (s) metal(s) layer (s) is usually applied, among others, in the sheet of brazing in order to enhance corrosion characteristics by providing cathodic protection alloy core and/or to provide a filler metal, usually an alloy AlSi, for the operation brazing.

Ideally, the aluminum layer of the core is made in the form of a rolled sheet product, which(th), then subjected to bending in the shape of a tube and then welding the seam. The metal core may be subjected to welding a lap joint or butt welding. Welding can be done in various methods of welding, including welding, ultrasonic welding, TIG (tungsten inert gas) welding with a laser.

The product of the aluminum alloy according to the invention can be obtained by casting an ingot; homogenising and/or pre-heating the ingot after casting; hot rolling the ingot; cold rolling to a final thickness; annealing the cold-rolled product at a temperature of from about 250°C to 550°C, preferably at a temperature of p is IMEMO from 300°C to 400°C; optional stretching and/or aging of the final product.

The invention also relates to the use of the above-described aluminum alloy in a flexible multilayer pipe having made of plastic outer and inner layers and a core layer made of products of aluminum alloy. This pipe preferably is a sanitary pipe or tube heating buildings. In such multilayer pipe can be bent, so it is very flexible and has a length of several meters, for example from 4 to 50 meters or more in length.

Figure 1 is a view in perspective of the end portion of the multilayer pipe 4 according to the present invention having an aluminum layer 10 of the core, the inner layer 20 and outer layer 30. According to this invention, the aluminum alloy core has no(s) metal(s) layer(s).

Hereinafter the invention will be illustrated by the following non-limiting example.

Example

Tests were subjected to five alloys listed in table 1. The alloy But is an alloy of AU, the alloy is an alloy AU, and alloys C-E represent the alloys according to the invention. The main differences alloy from alloys a and b lie in the increased content of Si, Cu, Zn, and Ti. Alloy D is, in particular, high soderzhanie compared to alloy A. Alloy E has, in particular, high concentrations of Si and Cu compared to alloy B. Samples of welded pipes was prepared as follows.

Alloys a-E with the chemical composition given in table 1, were cast into ingots with a thickness of 500 mm in the traditional way of casting in a mold with direct cooling. Then the ingots are homogenized and optional pre-heated to temperatures shown in table 2. Thereafter, the ingots were subjected to hot rolling to a thickness after hot rolling 3 mm, hot-Rolled products were subjected to cold rolling to the final thickness of 0.25 mm Before final annealing the cold rolled product was subjected to alkaline degreasing (alkali). Cold rolled coils were annealed at a temperature of 400°C. or 350°C. Then the rolls are cut into strips of a width of 66 mm and made of them a welded tube with an inner diameter of 16 mm, the Seam was welded butt (alloys C, D, E) or folding (alloys a and b).

Then made so the pipes were tested on prolonged exposure to pressure in accordance with ASTM-F1281. In this test, the sample was kept at a constant temperature of 95°C. and the internal pressure of 30 bar. The results are presented in table 3. Alloys C, D and E were also tested at a higher internal pressure, and the obtained results are presented in table 4.

In table 3, t is the train presents the results of the other tests, namely, the limit of the tensile strength (TS), yield strength (YS) and elongation at break A50 mm, measured according EN1002.

As is shown in the table 3 results, the alloy according to the invention showed unexpectedly much longer service life test internal pressure ASTM-F1281. Its lifetime is more than 100 times greater than that of the alloy constituting the alloy AA, which already works better than the alloy And constituting the alloy AA.

The ultimate tensile strength of the alloy is also higher than that of each of the alloys a and b, and its yield strength is higher than that of alloy And, although not as high as alloy Century

Alloy E is due to a lower content of Si lower yield strength that is best for formemost, for example, the profiling roller Lotoshino car. However, it also has a slightly lower elongation.

As is shown in the table 4 results, alloys C, D and E are also advantageous over a long service life at higher pressures compared with the internal pressure of 30 bar, are presented in table 3.

It was also found that the content of Si plays an important role in the weldability of aluminum alloys. The alloy has a relatively high content of Si and was very well welded PR is the connection lapped and when welding with a laser at a high speed blending of the weld. Alloys D and E, in contrast, have a relatively low content of Si in comparison with the alloy, and these alloys are ideally suited for laser welding at low speed blending of the weld and TIG welding.

Such high mechanical property, good formability and weldability and high resistance to fracture of creep, i.e. high resistance to internal pressure at high temperature, making aluminum alloy according to the invention an ideal candidate for application in flexible multilayer pipes.

Table 1
The alloy compositions in wt.% the rest is aluminum and inevitable impurities
AlloyAlloying element
SiFeCuMnMgTiZn
A0,190,490,071,080,010,020,01
B0,13of 1.340,020,390,010,020,02
C0,980,430,251,100,060,110,10
D0,210,570,181,020,030,010,02
E0,331,270,250,370,070,010,04

Table 2
The process parameters
AlloyHomogenization/pre-hydrated heatingThe start of hot rolling TThe end of the hot car and T The final annealing
A600°C/14 h + 500°C/5 h480°C310°C400°C
B480°C/6 h440°C310°C400°C
C600°C/14 h + 500°C/5 h480°C310°C350°C
D600°C/14 h + 500°C/5 h480°C310°C350°C
E600°C/14 h + 500°C/5 h480°C310°C350°C

Table 3
The results of the tests
AlloyProperty
TS (MPa)YS (MPa)A50 (%)Service life ASTM-F1281 The grain size (microns)
A11546335-15 min100
B13180310.3 to 3 h100
C13756261150 h100
D1265430>280 h-
E1215720--

Table 4
Life according to ASTM-F1281 at 95°C for different internal pressures
AlloyService life depending on the internal pressure
35 bar37 bar42 bar
C160 h--
D-->1 hour
E->24 h-

After studying all the above description of the invention, an ordinary person skilled in the art it will be obvious that it may be subject to many changes and modifications without changing the essence or scope of the invention described here.

1. Multilayer pipe having a pipe wall comprising a core layer of aluminum alloy, made of rolled sheet products made of plastic inner layer and is made of plastic outer layer and the core layer is an aluminum alloy containing, by weight.%:

Siof 0.2-1.4
Fe+Mn1,1-1,8/td>
Cu0,15-0,5
Mg<0,20
Ti<0,20
Zn<1,5

and other impurities or incidental elements <0.05 for each, just <0.2 and the rest is aluminum.

2. Multilayer pipe according to claim 1, in which the core layer is subjected to bending in the shape of a tube and welding it to the seam.

3. Multilayer pipe according to claim 1, in which the core layer further comprises Pb and/or Bi, with Pb+Bi<0,05%.

4. Multilayer pipe according to claim 1, in which the Si content in the core layer is from 0.85 to 1.4%, and preferably from 0.85 to 1.2%.

5. Multilayer pipe according to claim 1, in which the Fe content in the core layer is from 0.20 to 0.8%, and preferably from 0.30 to 0.45%, and the content of the MP is from 0.90 to 1.15%.

6. Multilayer pipe according to claim 1, in which the content of mn in the core layer is from 0.20 to 0.50%, and preferably from 0.30 to 0.50%and the Fe content is from 0.90 to 1.30%.

7. Multilayer pipe according to claim 1, in which the Cu content in the core layer is from 0.15 to 0.30%, and preferably from 0.20 to 0.30%.

8. Multilayer pipe according to claim 1, in which the Mg content in the core layer is from 0.05 to 0.10%.

9. Multilayer pipe according to claim 1, in which the content is of Zn in the core layer is the greater of 1.0%, preferably at most 0.5%, and more preferably at most 0.20 per cent.

10. Multilayer pipe according to claim 1, in which the content of Ti in the core layer is from 0.11 to less than 0,20%, and preferably from 0.11 to 0.16%.

11. Multilayer pipe according to claim 1, in which the core layer has a thickness of from 0.1 to 1.0 mm, and preferably from 0.15 to 0.6 mm

12. Multilayer pipe according to claim 1, and this pipe has a resistance to current a long time pressures without failure for more than 100 h at 95°C. when the internal pressure of 30 bar in accordance with the creep testing ASTM F 1281.

13. Multilayer pipe according to claim 1, which is a multilayer pipe is a sanitary pipe or tube heating in buildings.



 

Same patents:

FIELD: metallurgy.

SUBSTANCE: invention refers to metallurgy, and namely to processing of aluminium-bearing slags, as well as to obtaining of alloys on aluminium basis by electrolysis of melts. Aluminium-bearing slag is subject to deep processing involving crushing and pulverisation to fraction size of 0.064-2 mm, water leaching of slag at water flow of 1.05-2.5 l/kg during 20-60 min in reactor with mechanical mixing, pulp filtration and evaporation of saline solution so that ready covering flux with humidity of 0.5-5% is obtained. Oxide deposit is subject after drying to electrolysis in fluoride-chloride melt at temperature of 910-990°C and cathodic current density of 0.55-1.2 A/cm2 so that aluminium-based alloy is obtained.

EFFECT: invention allows full extraction of metallic aluminium from slag, reduction of amount of waste at its processing and obtaining of covering fluxes and alloys on aluminium basis for steel deoxidation and manufacture of branded alloys on aluminium basis.

2 cl, 1 ex

FIELD: metallurgy.

SUBSTANCE: molten aluminium is prepared and heated above liquidus temperature. Perforated fire-resistant melting pot with titanium sponge is introduced to melting pot with molten aluminium, which is covered with flux. Size of holes of perforated melting pot is smaller than size of titanium sponge. Perforated melting pot is located so that its edge is located above mirror of metal in melting pot. After that, titanium sponge is molten using concentrated heating source - electric arc or compressed electric arc or laser.

EFFECT: invention allows reducing the time required for titanium dilution in molten aluminium owing to using concentrated heating source, which improves the efficiency of preparation process of aluminium alloy combinations and reduces labour intensity.

FIELD: metallurgy.

SUBSTANCE: according to the method aluminium is molten in the form of electrotechnical aluminium waste, the melt of which includes silicone in the form of waste of crystalline silicone with fraction size of 2 to 10 mm in quantity of 40÷45% of introduced silicone weight at melt temperature which is higher by 10÷20°C than liquidus temperature for obtaining the melt at crystallisation interval of not less than 30°C. Melt is cooled to solid-liquid state and the second portion of silicone of the same fraction is introduced in quantity of 40÷45% of the introduced silicone weight, mixed and exposed at temperature of introduction of the second silicone portion during 15÷20 minutes. The third portion of silicone with fraction size of less than 2 mm is introduced in quantity of 5÷15% of the weight of introduced silicone at temperature which is higher than solidus temperature by 20÷40°C, mixed and exposed till complete dilution of silicone.

EFFECT: invention allows obtaining microcrystalline structure of alloy combination owing to using pulverised silicone addition and due to high crystallisation speed.

1 tbl, 1 dwg

FIELD: metallurgy.

SUBSTANCE: aluminium-based cast alloy has the following chemical composition, in wt %: Cu 3.5-6.0, Mg 0.2-0.9, Ti 0.1-0.4, Zr 0.1-0.5, Mn 0.2-1.2, Zn 0.5-2.5, Sc 0.15-0.5, Al making the rest.

EFFECT: reduced metal consumption, higher reliability in operation.

2 tbl

FIELD: metallurgy.

SUBSTANCE: aluminium-based cast alloy has the following chemical composition, in wt %: Cu 3.5-6.0, Mg 0.2-0.9, Ti 0.1-0.4, Zr 0.1-0.5, Mn 0.2-1.2, Zn 0.5-2.5, Sc 0.15-0.5, Al making the rest.

EFFECT: reduced metal consumption, higher reliability in operation.

2 tbl

FIELD: metallurgy.

SUBSTANCE: aluminium-based cast alloy has the following chemical composition, in wt %: Cu 3.5-6.0, Mg 0.2-0.9, Ti 0.1-0.4, Zr 0.1-0.5, Mn 0.2-1.2, Zn 0.5-2.5, Sc 0.15-0.5, Al making the rest.

EFFECT: reduced metal consumption, higher reliability in operation.

2 tbl

FIELD: metallurgy.

SUBSTANCE: proposed alloy contains the following components, in wt %: copper 3.50-4.50, magnesium 1.20-1.60, manganese 0.30-0.60, zirconium 0.01-0.15, silver 0.01-0.50, iron 0.01-0.12, silicon 0.01-0.08, titanium 0.01-0.06, scandium 0.01-0.20, calcium 0.001-0.05, at least, one element from the GROUP including nickel 0.005-0.05, hafnium 0.01-0.10. Note here that total amount of Fe+Si≤0,15 at Fe/Si≥1.2, aluminium making the rest.

EFFECT: higher strength, crack resistance and fatigue strength.

2 tbl

FIELD: metallurgy.

SUBSTANCE: aluminium is molten, molten metal is brought to overheated homogeneous state at temperature of 1150°C. Stannum, indium and bismuth is added; melt temperature is brought to temperature of up to 1150°C; exposure is performed at this temperature. Then, lead and copper is added so that alloy can be obtained with the composition, wt %: lead 13.5, stannum 4.5, copper 0.5, indium 1.0, bismuth 1.3, aluminium 79.2 or with the following composition, wt %: lead 15.4, stannum 5.0, copper 1.0, indium 0.5, bismuth 1.0, aluminium 77.1 or with the following composition, wt %: lead 13.2, stannum 5.5, copper 1.4, indium 1.5, bismuth 0.5, aluminium 77.9, melt is mixed and exposed at temperature of 1150°C. After that, melt is drained to spray-type melting pot and sprayed with argon till the powder that is compacted and rolled till the plate is produced is obtained, and sputtering target is made from it.

EFFECT: producing the target allowing to obtain thin working layers on treated items and providing improved running-in ability and scoring resistance of working layers without reducing the strength and wear resistance.

1 tbl, 1 ex

FIELD: metallurgy.

SUBSTANCE: aluminium is molten, and then the melt is brought to overheated state at temperature of 1100°C. After that, lead, stannum, copper and silicium is introduced subsequently so that alloy can be obtained either with the following composition, wt %: lead 7.4, stannum 0.9, copper 0.4, silicium 3.4, aluminium 87.9, or with the following composition, wt %: lead 9.1, stannum 2.1, copper 1.6, silicium 4.6, aluminium 82.6; the melt is mixed, exposed at overheat temperature of 1100°C and drained to horizontal flat mould. The melt hardening in the mould is treated with electric and magnetic crossed fields and cast sputtering target is manufactured.

EFFECT: producing the target allowing to obtain thin working layers on treated items and providing improved running-in ability and scoring resistance of working layers without reducing the strength and wear resistance.

1 tbl, 1 ex

FIELD: metallurgy.

SUBSTANCE: aluminium-based alloy contains the following components, wt %: copper 0.9-1.9, manganese 1.0-1.8, zirconium 0.2-0.64, scandium 0.01-0.12, iron 0.15-0.4, silicium 0.05-0.15, aluminium is the rest; at that, alloy contains zirconium and scandium in its structure in the form of nanoparticles of phase Al3(Zr, Sc) with average size of not more than 20 nm and with crystal latitude L12; at that, alloy conductivity exceeds 53% IACS, and ultimate strength (σult) after heating during 100 hours at 300°C exceeds 320 MPa. Method for obtaining deformed semi-finished product from the above alloy involves preparation of the melt of the above alloy at the temperature exceeding liquidus temperature not less than by 50°C; obtaining cast workpiece by means of melt crystallisation, deformation of cast workpiece at the temperature not exceeding 350°C; intermediate annealing of deformed workpiece at 300-455°C; deformation of the annealed workpiece at room temperature and annealing at 300-350°C so that the deformed semi-finished product is obtained.

EFFECT: obtaining alloy and semi-finished products from it, which have high mechanical and electrical properties.

7 cl, 2 dwg, 7 tbl, 6 ex

FIELD: process engineering.

SUBSTANCE: invention relates to production of composite materials, particularly, to two-layer sheet material and to method of its fabrication. Two-layer sheet material comprises metal substrate from aluminium and layer of PTFE. Metal substrate is made from aluminium powder and bonded with the layer of PTFE powder layer over the entire surface of contact by blast extrusion to produce wavy surface of bond. Proposed method comprises producing metal substrate, applying polymer coat from PTFE and thermal treatment. Aluminium powder is used as substrate material. Application of polymer coat is accompanied by blas extrusion using sliding shock wave at the pressure of 0.5-0.7 GPa and with shock pulse duration of, at least, 35 mcs while thermal treatment is performed at 400°C and 0.6-0.7 MPa.

EFFECT: higher adhesion due to PTFE blast shock wave effects.

2 cl, 3 dwg, 1 tbl, 1 ex

FIELD: paint-and-varnish industry.

SUBSTANCE: this invention covers application methods of decorative coatings, and lamination of a decorative film from resin-base material covered with a decorative metal film. Polymer leveling film is laminated at resin-base material by precipitation polymerization method, and then the decorative metal film is laminated at the leveling film.

EFFECT: perfect adhesion of a resin-base material, and a glaze for a decorative metal film.

6 cl, 2 dwg

FIELD: construction.

SUBSTANCE: invention refers to a structural part that comprises a metal component and a plastic component, which are connected to each other by means of a linkage system that may withstand long-term load of connection between part components, and to the method for manufacturing of such a structural part. The linkage system that connects the metal component and the plastic component comprises a binding substance based on plastic or a binding substance based on plastic in combination with a primer. At the same time the plastic-based binding substance is an epoxide modified by means of covalent attachment of 1,3-diene. Besides, the binding substance contains a hardener.

EFFECT: manufactured structural parts have high bending strength and torsional stiffness, are able to withstand dynamic and static load, may be applied in corrosion media.

23 cl, 1 dwg, 1 tbl

FIELD: process engineering.

SUBSTANCE: invention relates to laminar material made from metal sheets and polymer layer reinforced by fibers and bonded therewith, to be used in aircraft or aerospace engineering. Laminar material comprises at least one first metal layer of invariable thickness of at least 1.5 mm and at least one second of invariable thickness of at least 1.5 mm. Said first and second layers are bonded together by polymer layer reinforced by fibers, volume content of fibers not exceeding 45%. Aforesaid polymer layer comprises reinforcing fibers laid in polymer matrix and selected from the group including fiber glass, carbon fibers, drawn thermoplastic fibers, natural fibers and combinations thereof. Said fibers are impregnated by polymer matrix in partially hardened state.

EFFECT: hardened, high fatigue strength material.

17 cl, 6 dwg

FIELD: process engineering.

SUBSTANCE: set of inventions relates to plain bearing and method of its production. Proposed plain bearing comprises metal base, intermediate layer applied thereon and antifriction layer applied on said intermediate layer. Said intermediate layer comprises at least one thermoplastic polymer containing functional groups of the formula

.

Note here that R stands for cyclic or linear organic radicals with 1-20 carbon atoms. Note also that functional groups are implanted into thermoplastic polymer by adding at least one modifying agent, namely, toxilic acid and its derivatives, in particular its anhydride and or itaconic acid and its derivatives, particularly, its anhydride, and/or citraconic acid and its derivatives, particularly, its anhydride.

EFFECT: bearing that requires no servicing.

24 cl, 2 dwg

FIELD: chemistry.

SUBSTANCE: coating composition contains a polyvinyl chloride polymer, an acrylic resin which is preferably a polymer obtained from monomer acrylates or methacrylates, such as acrylic acid, methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, pentyl acrylate, hexyl acrylate, methacrylic acid, methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, pentyl methacrylate, hexyl methacrylate resins, copolymer resins of said components or mixtures thereof, a cross-linking agent which is obtained from phenol, para-tert-butylphenol, xylenol or mixture thereof, and formaldehyde, an additive, a dye and a solvent component, and the composition essentially does not contain bisphenol A diglycidyl ether (BADGE) and bisphenol A resin. The coatings are suitable for containers made from three parts, as well as for metal cans made through deep-drawing. The coatings are particularly useful for covers which are torn in order to open due to their unusual flexibility and resistance to sterilisation.

EFFECT: composition provides coatings for metal cans which have suitable flexibility, resistance to scratching, adhesion and sterilisation during processing while in contact with food.

18 cl

FIELD: process engineering.

SUBSTANCE: invention relates to sensor foil and sensor switch made thereof. Sensor foil is made up of multiple superimposed layers. Note that carrier second conducting layer 2 is arranged above first carrier layer 1, while second carrier layer 3 coated by paint 4 is arranged on conducting later 2. First carrier layer 1 provided with conducting layer 2 and second carrier layer 3 with pint coat 4 are glued together by adhesive layer 5. Device assembled of said layers 1 - 5 is glued to carrier layer 7 by adhesive 6 made, for example, from glass.

EFFECT: possibility to use in household electrical appliances, eg furnaces.

7 cl, 2 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to coat and method of coating outer surfaces. Proposed method of coating pipeline outer surfaces by polymer capable of forming cross-links under action of water comprises the following stages: a) pipeline outer surface is coated by, at least, one polymer that forms cross-links under action of water. Note here that said polymer represents HDPE grafted by alkoxy silane. b) Polymer is cross linked on subjecting it to water at increased temperature to produce cross-linked polymer layer unless cross linking degree makes ≥30% to ≤80%. c) Polymer is cross linked that can form cross links under action of water at ≥50°C to ≤350°C, preferably at ≥150°C to ≤300°C, more preferably at ≥200°C to ≤260°C. Note here that during these stages, pipeline is heated to ≥170°C to ≤230°C, preferably to ≥180°C to ≤220°C, more preferably to ≥190°C to ≤210°C. Powder ionic spraying method is used epoxy resin layer is applied with thickness of ≥0.08 to ≤0.16 mm, preferably of ≥0.10 to ≤0.13 mm, more preferably, 0.125 mm. Method of envelopment extrusion is used to apply a layer of glue with thickness of ≥0.15 mm to ≤0.30 mm, preferable of ≥0.22 mm to ≤0.27 mm, more preferably of 0.25 mm. By method of extrusion, applied is upper layer of HDPE with thickness of ≥2.8 mm to ≤3.2 mm, preferably of ≥2.9 mm to ≤3.1 mm, more preferably of 3 mm. Extrusion is used to apply layer of HDPE cross linked by silane with thickness of ≥0.8 mm to ≤1.2 mm, preferably of ≥0.9 mm to ≤1.1 mm, more preferably of 1 mm. Now, pipeline is treated by water with temperature of ≥10°C to ≤40°C, preferably of ≥20°C to ≤30°C, more preferably of 25°C. Coat is made as described above. Invention covers also coated pipeline.

EFFECT: improved operating performances and expanded applications.

11 cl, 2 tbl, 3 dwg, 2 ex

FIELD: process engineering.

SUBSTANCE: invention relates to multilayer metallised biaxially-oriented polypropylene films used for food packing and to method of their production. Said film comprises main layer A made from crystalline home- or copolymers of propylene comprising bonds C2-C10 of alpha-olefine, one top layer B made from propylene copolymer containing 3 to 6 wt % of the bonds of linear C4-C10-1-alkene, and metal layer M applied on the surface of top layer B. Propylene copolymer of layer B has fraction soluble in xylene at 23°C, less than 4.0 wt %, Vick softening point above 135°C indenter depth in Vick test smaller than or equal to 0.05 mm at 120°C. Method of film production comprises co-extrusion of layers A and B, biaxial orienting of co-extruded layer A and B, treatment of top layer B surface and metal deposition on said layer.

EFFECT: multilayer metallised biaxially-oriented polypropylene films with high oxygen and steam barrier properties.

FIELD: process engineering.

SUBSTANCE: invention relates to multilayer metallised biaxially-oriented polypropylene films used for food packing and to method of their production. Said film comprises main layer A made from crystalline home- or copolymers of propylene comprising bonds C2-C10 of alpha-olefine, one top layer B made from propylene copolymer containing 3 to 6 wt % of the bonds of linear C4-C10-1-alkene, and metal layer M applied on the surface of top layer B. Propylene copolymer of layer B has fraction soluble in xylene at 23°C, less than 4.0 wt %, Vick softening point above 135°C indenter depth in Vick test smaller than or equal to 0.05 mm at 120°C. Method of film production comprises co-extrusion of layers A and B, biaxial orienting of co-extruded layer A and B, treatment of top layer B surface and metal deposition on said layer.

EFFECT: multilayer metallised biaxially-oriented polypropylene films with high oxygen and steam barrier properties.

FIELD: shaping or joining of plastics.

SUBSTANCE: method comprises applying adhesive polymeric composition on the metallic surface, molding a plastic covering on the metallic surface, and heating and pressing the metallic surface. The surface is pressed during five seconds or less, the pressure ranging from 0.01 MPa to 5 MPa.

EFFECT: enhanced adhesion between the polymeric and metallic surfaces.

4cl, 2 ex

Up!