Method of forming semis from titanium alloy bt6

FIELD: process engineering.

SUBSTANCE: invention relates to metallurgy, particularly, to forming semis from titanium alloy BT6 and may be used in machine building, aircraft engineering and medicine. Proposed method comprises annealing at 850°C with holding for an hour in furnace to create globular (α+β)-structure and multipass rolling combined with affecting semis to pulsed electric current with density of 50-200 A/mm2, frequency of 830-1000 Hz, pulse duration of 100-120 ms to ensure total true strain degree of e>1 and to form nanocrystalline structure in semi. Note that, after every pass, semi is water cooled. Higher forming capacity of alloy is provided for.

EFFECT: higher strength at optimum ductility.

5 cl, 1 dwg, 1 tbl, 1 ex

 

The invention relates to metallurgy, in particular to a method of forming blanks of titanium alloy VT6 for a homogeneous ultrafine-grained structure, and can be used in the manufacture of semi-finished products for critical applications in engineering, aircraft engine industry and medicine.

Known methods of processing titanium alloys to improve their properties, in particular, to obtain ultrafine-grained structures for the improvement of physical-mechanical characteristics. These methods can be combined intensive plastic deformation and thermomechanical processing.

For example, the use of methods of intensive plastic deformation, such as equal channel angular pressing, forging multilateral, screw extrusion, leads to the refinement of the structure of alloy VT6 and considerable improvement in mechanical and operational properties [1].

A method of processing large components of (α+β)-titanium alloys to obtain a homogeneous fine-grained microstructure by deformation at temperatures below the temperature of complete polymorphic transformation [2].

There is also known a method of manufacturing products of titanium-aluminium-vanadium alloy, including the hot pressure treatment to make the alloy microstructure suitable for x is cold deformation, and cold pressure treatment. The invention is aimed at reducing the loss of finished products, reducing energy consumption for thermal processing of the alloy to improve such indicators in the manufacture of products, as the yield stress in tension and ultimate tensile strength [3].

There is also known a method of processing ultrafine-grained billets of titanium alloys, including multiple comprehensive forging with the change of the axes of deformation, thermomechanical processing with step by lowering the temperature in various combinations: forging with hood, rolling, drawing, with the relative degree of deformation can reach up to 98% with preservation of the stock of plasticity. The invention allows to obtain in conditions of industrial production of ultrafine-grained billet of titanium alloys with a wide range of geometrical parameters with high physical-mechanical properties [4].

There is also known a method of producing sheets of titanium alloy Ti-6A1-4V method roll rolling [5]. The method includes pre-processing of the ingot, plate cutting and finishing operations. Pre-processing of the ingot consistently hammering or die-stamping ingot in β or α+β domains with the receipt of the slab. The slab is rolled in the roughing and finishing mills with obtaining and strip her with odoi roll followed by etching and annealing. This is followed by cold rolling of the strip for a few cycles to get stripe of specified thickness and microstructure with winding it into a roll, followed by annealing and etching. The technical result - obtaining a given microcrystalline structure, which provides high strength characteristics.

The known method of machining titanium billets repeated rolling or extrusion, to provide significant improvement in mechanical properties due to the creation of the material substructure [6].

The disadvantages of the known methods are low productivity and energy efficiency, the need for a large number of intermediate operations, high internal stresses in the products, weak refinement of the structure, the use of small and medium degrees of deformation, and therefore cannot use this method for machining thin-section, the release of a large amount of pollutants in the production process.

The closest to the invention is a method for rolled titanium alloys [7], which includes heating the workpiece to a temperature of 20-60°C below the temperature of complete polymorphic transformation and mnohaproudou rolling at a constant speed of rotation of the rolls in the steady state deformirovny the Oia, moreover, the compression in each pass is prescribed depending on the value of reducing the temperature of the rolled metal. This method and sequence of treatments have been successfully used on the alloy VT6 to effectively obtain fine-grained equiaxial semi-finished products with high anisotropy of mechanical properties.

The disadvantages of the method are relatively low degree of deformation (e<1), weak dispersion patterns, the need for intermediate annealing during multi-pass rolling, not allowing to achieve high performance properties, performance and energy saving, and low technological plasticity, which is a limitation for the formation of nanocrystalline structure and, accordingly, the possibility of simultaneous improvement of the mechanical (strength and plastic) characteristics.

The invention is directed to the development of a method of processing semi-finished products made of titanium alloy VT6 order to obtain thin and super-thin wires, sheets and strips (thickness less than 1.0 mm) with improved performance characteristics by increasing the deformability and the formation of a nanocrystalline structure.

The task is solved in that in the method of processing semi-finished products made of titanium alloy VT6 apply annealing and multi-pass rolling with getting long the dimensional workpieces, while the annealing of semi-finished products is carried out at a temperature of 850°C and aged for one hour in a furnace with the formation of globular (α+β)-structure, and in the process of a multi-pass rolling is formed in the material of the nanocrystalline structure with the influence of pre-pulsed electric current density between 50 and 200 A/mm2frequency 830-1000 Hz, pulse duration 100-120 ISS and ensuring total true strain e>1, with each turn of the rolling of the semi-finished product is cooled in water. Pulse electric current acting directly on the zone of deformation in the direction of rolling. The degree of deformation of the alloy regulate by changing the density of the pulse current. Also regulate the curvature of the semi-finished product by changing the direction of rolling. When the rolling is performed with the use of rectifying prefabricated snap.

The proposed method can be used to obtain semi-thin section of the nanostructured alloy VT6 when multi-pass rolling step, the deformation of which is several times higher compared to rolling without current. The density of the pulse current during rolling is an important technological parameter and allows you to adjust the deformability of the alloy by controlling the processes of hardening and razor is Chania. Grinding grains to 100 nm is achieved by slicing and partial recrystallization structure.

Thus, the proposed set of features of the process allows to obtain long ultrafine-grained nanostructured thin workpiece cross-section, as well as reduce the effort into the mill by 20-30% and to eliminate costly operations intermediate annealings at improving product quality. In addition, the process electroplastic rolling characterised by local exposure to the elements of the fine structure, high efficiency and environmental friendliness.

The proposed invention is illustrated in the following drawing,

where 1 is a diagram of the tensile alloy VT6 in the initial state (1) and after electroplastic rolling (2) to the degree of deformation e=1.5.

The method is as follows.

The source of the workpiece, in particular strip size (1÷2)×10×100 mm3alloy VT6 (containing, wt.%: Al - 6,5; V - 5,1; Zr - 0,3; Fe - 0,3; 0,2; C - 0,1; N - 0,05; N - 0,015, Ti - else), is subjected to isothermal annealing at 850°C for the formation of a globular structure with exposure for one hour with the oven. This heat treatment showed the best combination of plastic and strength properties (table). Next, the samples are subjected to a multi-pass rolling in the longitudinal direction at p is okaton mill, equipped with a pulse current generator. For example, put it in the cage mill and carry out multiple rolling with the current, for the purpose of accumulating a high degree of true strain e>1. The direction of the current must coincide with the direction of rolling. To summarize and removal of current uses sliding contact (negative pole) to the deformation zone and one of the rolls (positive pole). To prevent the strong curvature of the samples used special equipment. After each step of rolling the samples are cooled in water. The temperature of the sample subjected to the transmission of electric pulse current maximum density should not exceed 150°C. For a short time pulses of the metal is not heated and, unlike electrocontact heating, by Epps electric current is passed mainly through the zone of deformation. Depending on the desired objectives of the study, the properties of the structure and its defects, the size of the workpiece before and after compression is taken or that the degree of accumulated true strain.

For regulating the degree of true strain, strength characteristics and microhardness of alloy VT6 used pulsed current density of 50-200 A/mm2frequency 830-1000 Hz, pulse duration 100-120 ISS. The effect of the pulse current is markedly reduced at a density less than the 50 A/mm 2. To increase the homogeneity of the structure after rolling is annealed at a temperature of 450-600°C.

The research results show that when rolling with the current (j=50 A/mm2first cracks appear when e≤0.05 and destruction was observed at e=0.25. The maximum deformation capacity and at the same time the maximum hardening effect showed flat samples after rolling when j=175 A/mm2. For samples of circular cross - case j=120 A/mm2.

All samples of titanium alloy VT6 obtained by this method had a higher strength properties in comparison with the same cold rolling.

In this way were processed samples of flat and round (diameter 7 mm) section. Some of the processing modes, the results of the mechanical tests and for determining the microhardness of samples are shown in the table.

Example.

The source material is a strip size (1÷2)×10×100 mm3cut from gorjachekatanyh blanks standard for VT6 chemical composition. The maximum degree of deformation e=2,3 provided the following mode. Pre-annealed at 850°C. the strip was subjected to rolling with the current in step-by-step mode single-compression thickness of 25 μm at room temperature, speed 60 mm/s to a final thickness of 0.2 mm by following the parameters of the pulse current: pulse duration τ=120 μs, the frequency F=830 Hz and a current density of j=175 A/mm2.

As shown by the results obtained, rolling with the current contributes to the refinement of the structure of alloy VT6 and reduce the grain size of 500 nm by fragmentation and formation of partially recrystallized structure, while improving the hardness and strength characteristics (figure 1), while maintaining sufficient plasticity.

Thus, the proposed processing method allows to obtain the prefabricated thin section with its geometric dimensions without intermediate annealing, to reduce the grain size in the structure, thereby significantly improve the mechanical properties of the processed material, and use it for the production of critical parts in mechanical engineering, aerospace and medicine.

The list of references

1. Valiev R.Z., Alexandrov I.V. Nanostructured materials from severe plastic deformation. - M.: Logos, 2000. - 272 S.

2. Patent No. 2196189, IPC C22F 1/18, 10.01.2003.

3. Patent No. 2339731, IPC C22F 1/18, 05.05.2004.

4. Patent No. 2364660, IPC C22F 1/18, 20.08.2009.

5. Patent No. 2381296, IPC C22F 1/18, 07.05.2008.

6. Zwicker U. Titanium and its alloys. Berlin-New York. 1974. TRANS. with it. - M.: Metallurgy. 1979. S.

7. Patent No. 2175581, IPC B21 EOI/00, 10.11.2001.

1. The method of processing semi-finished products made of titanium alloy VT6, including annealing and mnogonado the second rolling with obtaining long workpieces, characterized in that the annealing of semi-finished products is carried out at a temperature of 850°C and aged for one hour in a furnace with the formation of globular (α+β)-structure, and in the process of a multi-pass rolling is formed in the material of the nanocrystalline structure with the influence of pre-pulsed electric current density between 50 and 200 A/mm2frequency 830-1000 Hz, pulse duration 100-120 ISS and ensuring total true strain e>1, with each turn of the rolling of the semi-finished product is cooled in the water.

2. The method according to claim 1, characterized in that the pulsed electric current acting directly on the zone of deformation in the direction of rolling.

3. The method according to claim 1 or 2, characterized in that the degree of deformation of the alloy regulate by changing the density of the pulse current.

4. The method according to claim 1 or 2, characterized in that regulate the curvature of the semi-finished product by changing the direction of rolling.

5. The method according to claim 1 or 2, characterized in that the rolling is performed with the use of rectifying prefabricated snap.



 

Same patents:

FIELD: process engineering.

SUBSTANCE: invention relates to metallurgy, particularly, to plastic deformation of metals, namely, to production of thin sheets from (α-β)-, pseudo-β, β-titanium alloys. Proposed method comprises preparing stack consisting of the main and clad layers for rolling, assembling said stack, welding, degassing, hot rolling of clad sheet, subsequent rolling and thermal treatment, and surface finishing. Said stack is assembled of the main layer composed of large-size blank from difficult-to-deform titanium alloy and two clad layers from unalloyed titanium used as temporary layers. Clad sheet is rolled in several passes at temperature above and below that of polymorphic transformation Tpt. Note here that after rolling said clad layers are removed in surface finishing.

EFFECT: production of thin high-surface-finish sheets from ((α-β)-)-, pseudo-β, β-titanium alloys.

2 dwg, 4 tbl, 1 ex

FIELD: metallurgy.

SUBSTANCE: beta-titanium alloy with ultrafine-grained structure consists of beta-phase gains with mean size not exceeding 0.5 mcm, precipitations of secondary alpha-phase particles of spherical shape and mean size not exceeding 0.5 mcm and volume fraction in the structure making at least 40%. Proposed method comprises intensive plastic deformation and thermal treatment. Thermal treatment is carried out before deformation by heating to temperature exceeding that of polymorphic conversion by 5-15°C for, at least, one minute for 1 mm of diameter cross-section and quenching in water. Intensive plastic deformation is performed by equal-channel angular pressing with changing deformation direction through 90 degrees after every deformation cycle at (T"пп"-200…T"пп"-150)°C with total accumulated deformation e≥3.5 and subsequent quenching in water.

EFFECT: higher strength and fatigue characteristics of alloys.

2 cl, 1 tbl, 1 ex

FIELD: nanotechnologies.

SUBSTANCE: invention relates to the field of superconductivity and nanotechnologies, namely, to the method for production and processing of composite materials on the basis of high-temperature superconductors (HTSC), which may be used in devices of energy transmission, for development of current limiters, transformers, powerful magnetic systems. The method to process a high-temperature superconductor representing a composite structure made of a substrate material with applied buffer layers of metal oxides, a layer of a superconducting material of metal oxides, above which a protective layer of silver is applied, consists in radiation of the specified structure with an ion beam of heavy noble gases with energy from 48 to 107 MeV with a flux of 2×1010 - 5×1010 ion/cm2 and density of ion flux of 2.6×10-8 - 6.5×10-8 A/cm2 maintaining temperature from 30°C to 100°C, with provision of relief of internal elastic stresses in the composite structure.

EFFECT: improved characteristics.

3 dwg, 1 tbl

FIELD: metallurgy.

SUBSTANCE: invention is related to the treatment method of titanium-nickel alloys with nickel content of 49-51 at % with shape memory effect and reversible shape memory effect (versions). The above method involves thermomechanical treatment combining deformation and annealing after deformation in the temperature range of 350-500°C till the accumulated deformation degree of 25-40% annealing after deformation in the temperature range of 350-500°C is obtained; thermomechanical guiding of shape memory effect (SME) and reversible shape memory effect (RSME) the annealing after deformation is performed during 1.5-10 h, and guiding of SME and RSME is performed by means of loading of the alloy as per the bending pattern with deformation of 12-20% at temperature Ak -10 ≤ T ≤ Ak +10, exposure at that temperature during 0.25-5 minutes, cooling to the end temperature of martensitic transformation; after that, alloy is unloaded and thermally cycled in the temperature range of Ak to -196°C with exposures during 0.25-5 minutes. According to the second version of the method, after the deformation is completed, first, recrystallisation annealing is performed at the temperature of 700°C during 0.20-120 minutes, and then, annealing after deformation is performed.

EFFECT: improving functional properties of the alloy.

2 cl, 1 dwg, 3 ex

FIELD: metallurgy.

SUBSTANCE: unit for heat treatment and painting of multiple bent surgical needles includes the following: conveyor for transfer of needles from source of bent surgical needles to receiver, housing located near conveyor, where housing has the first end, the second end and the hole from the first to the second ends, heat source located inside the housing to heat multiple needles at their transfer by means of conveyor from the first end to the second end of the housing, and system for provision of gas mixture containing partial oxygen concentration for oxidation and painting of needle surfaces at their passage through the housing. Needle heat treatment and painting method involves the following: needle transfer from source of bent surgical needles to receiver, heating of needles to the temperature below recrystallisation temperature at their passage from source of bent surgical needles to receiver, provision of gas mixture containing partial oxygen concentration and needle surface painting during heating at their passage through gas mixture.

EFFECT: needles have painted surface, are characterised by increase in rigidity and plastic bending moment of bent surgical needles.

19 cl, 9 dwg, 4 ex

FIELD: metallurgy.

SUBSTANCE: method of thermomechanical treatment of workpieces from two-phase titanium alloys involves multi-stage severe plastic deformation with cumulative logarithmic deformation degree of not less than two and ageing. Severe plastic deformation of workpieces is performed with step-by-step temperature decrease at the interval of 0.99-0.3 of temperature of polymorphic transformation of alloy; at that, at the last stage of deformation the workpiece obtains the final shape. Prior to ageing the workpieces are heated up to temperature of 0.99-0.85 of temperature of polymorphic alloy transformation at the rate of not less than 50°C per minute and hardened.

EFFECT: increasing strength characteristics of two-phase titanium alloys and treatment process effectiveness.

3 cl, 1 tbl

FIELD: process engineering.

SUBSTANCE: invention relates to metal forming and may be used in hot working of intermediate blanks of titanium alloys. Blank produced by hot working after ingot heating to some 100°C - 200°C above polymorphic conversion temperature to make square cross-section blank. Straining is performed after heating the blank to 20°C - 60°C below polymorphic conversion temperature. Then, blank is recrystallised by heating to 50°C - 100°C above polymorphic conversion temperature and face upsetting with 1.3-1.4 forging reduction followed by cooling in water. Final straining is performed in several passes with single forging reduction making 1.5-2.0 after heating the blank to 20°C - 60°C below polymorphic conversion temperature. Total forging reduction in final straining makes 5.0-6.0.

EFFECT: uniform specified structure, reduced costs, power savings.

1 ex, 1 tbl

FIELD: metallurgy.

SUBSTANCE: alloy containing titanium, 38-46 at % of aluminium and 5-10 at % of niobium and having the structure including composite plates containing alternatively formed B19-phase and β-phase at their volumetric ratio of 0.05:1 to 20:1, enveloped with plate-like structures of γ-TiAl type in quantity of more than 10 volume percents of the volume of the whole alloy; at that, plate-like structures of γ-TiAl type include α2-Ti3Al phase the quantity of which constitutes up to 20 volume percents of the volume of the whole alloy. Method for obtaining titanium-containing alloy involves provision of intermediate product with the alloy composition containing 38 to 46 at % of aluminium and 5 to 10 at % of niobium, and heat treatment of intermediate product by heating at temperature of above 900°C during more than sixty minutes and further cooling at the rate of more than 0.5°C per minute.

EFFECT: alloys are characterised with high strength and creep strength at high ductility and crack resistance.

20 cl, 4 dwg, 1 ex

FIELD: metallurgy.

SUBSTANCE: method for obtaining products of "blisk" structure from heat-resistant titanium alloys having blade and disc zones is proposed. Method involves treatment of initial workpiece by deformation in β-zone, cooling, deformation of blade zone in (α+β)-zone and heat treatment of the product. Deformation in β-zone is performed at temperature of T"пп"+(10-30)°C in a closed die by pressing of metal out of disc zone to blade zone with deformation degree of not less than 50% so that shaped workpiece is obtained. Deformation of blade zone in (α+β)-zone is performed with deformation degree of not less than 45%.

EFFECT: obtaining the product of blisk structure with high metal use coefficient; formation in disc zone of the product of plate-type recrystallised microstructure with size of β-grain of 50-150 mcm, and in blade zone - globular plate-type, which provide optimum level of mechanical properties.

2 cl, 1 dwg, 1 tbl, 4 ex

FIELD: metallurgy.

SUBSTANCE: invention refers to heat treatment of high-strength (α+β)-titanium alloys and can be used in aerospace equipment during manufacture of power parts of structures. Heat treatment method of high-strength (α+β)-titanium alloys is proposed. Heating is performed over temperature of polymorphic transformation, exposure at that temperature, cooling to temperature of 680-630°C at the rate of not less than 18°C/min with further exposure during 1-3 h, heating to temperature of 720-780°C and exposure at that temperature during 2-3 h, cooling to temperature of 520-480°C at the rate of not less than 12°C/min. Then, heating is performed to ageing temperature, exposure at that temperature and cooling in the air. Alloys are characterised with high mechanical properties.

EFFECT: improving reliability of products of aerospace equipment owing to achieving higher level of mechanical properties.

1 tbl, 4 ex

FIELD: medicine.

SUBSTANCE: invention refers to medicine and veterinary medicine, namely to neurosurgery, and may be used for targeted drug delivery into the central nervous system of a living body. That is ensured by making a surgical approach to a segment of the central nervous system specified for local administration of the drug. Further, a drug source is placed therein. The drug source is a block of carbon composite - nanodiamond graphite-like carbon of the diamond content of 50-95 wt % and the porosity of 40-75 vol % pores of which are filled with the drug. The ratio of the block volume to its outer surface is 10-1000 mcm.

EFFECT: method provides a simplified and accurate targeted drug delivery to the specified region of the central nervous system.

2 cl, 2 ex

Light source // 2479064

FIELD: physics.

SUBSTANCE: in a light source, having a vacuum envelope inside of which there are cathodic electrodes in form of extended surfaces, having an emitter layer in form of a coating of nano-sized current-conducting structures and anodic electrodes having a phosphor layer, the emitter layer is in form of a heterogeneous structure in which there are additional electrostatic field concentrators in form of a set of nano-sized and/or micro-sized dielectric structures, wherein there are nano-sized gaps between the surfaces of the nano-sized current-conducting structures and the nano-sized dielectric structures.

EFFECT: providing activation of existing and formation of additional autoemission centres on conducting nano-structured particles of the emitter layer, reduced intensity of loading emitting nano-sized structures, eliminating criticality of the autoemission structure of the light source to the dimensional scatter of the nano-sized current-conducting structures and improved consumer properties of the light source, simplification of technological processes of making said light source.

4 cl, 5 dwg

FIELD: metallurgy.

SUBSTANCE: brass target coated by carbon nanotubes is processed in air by continuous radiation of ytterbium fiber laser in the presence of electrostatic filed of 250-750 V/m intensity ordering zinc and oxygen ion motion and accelerating it toward reaction area. Changing electric field parameters in said range allows producing blocks of zinc oxide 50-400 nm-dia whiskers including vertically ordered crystals.

EFFECT: production of crystals without catalysts or crystallisation chambers.

2 dwg

FIELD: nanotechnology.

SUBSTANCE: invention can be used in electronics, medicine and chemistry. In the volume of the reaction chambers 412 and 414 the vapors of catalyst material are obtained by evaporation of partially melted electrodes 435 and 445, made in the form of a reservoir filled with a metal containing catalyst. The electric arc discharge 450 is formed between the electrodes 435 and 445 in the discharge channel 405. Through the inlet 418 the plasma-forming gas is fed and in the vortex chamber 405 its vortex flow is obtained. During condensation of the resulting catalyst vapors the nanoparticles of the catalyst are formed, on which gaseous hydrocarbons are decomposed fed through the inlets 432 and 434. The products of decomposition of hydrocarbons in the form of carbon nanotubes, formed on the surface of the nanoparticles of the catalyst, are withdrawn through the outputs 442 and 444. According to another version, the reactor for obtaining carbon nanotubes comprises one reaction chamber and the second electrode may be solid, made of graphite or refractory metal. According to the third version, the reactor for obtaining carbon nanotubes comprises three reaction chambers.

EFFECT: combination of obtaining the catalyst and nanotubes in one reactor exception of complex, expensive and multi-stage process of manufacturing the catalyst.

20 cl, 8 dwg, 2 ex

FIELD: chemistry.

SUBSTANCE: invention can be used in motorcar, chemical, electronic and electrochemical industry. Graphite nanofibres with diameter of up to 50 nm, length of about 5 mcm and specific surface area of about 200 m2/g, which contain about 1 wt % catalyst nanoparticles with size of 10-30 nm are put into a container and held in a helium current at 773 K for pre-treatment. The catalyst used is one of the metals which dissociatively adsorb hydrogen - Pd, Pt, Ni, Ti, Fe, Co, Nb, Mo, Ta, W, Rh, Ru, Os, Ir, La, Mg and/or alloys thereof. The fibres are then hydrotreated at hydrogen pressure of 11 MPa and temperature of 298 K for 24 hours. A layer of chemisorbed hydrogen with thermal desorption activation energy of about 1.2 eV is formed in the surface regions of the nanofibres and a layer of chemisorbed hydrogen with thermal desorption activation energy of about 2.5 eV is formed on the inner surfaces of the nanofibres. Highly compact molecular hydrogen with density of up to 0.7 g/cm3 is intercalated in slit-like nanocavities in amount of about 10 wt %. Hydrogen is removed from the slit-like nanocavities by sharply reducing pressure and then annealing the sample at 295 K for 10 minutes. Chemisorbed hydrogen with thermal desorption activation energy of about 1.2 eV is removed by annealing at 800 K for 3 hours. The obtained nanofibres consist of multilayer fragments of graphane - polygraphane, in form of dark strips which are separated into separate nano-regions by slit-like nanocavities in form of light strips.

EFFECT: invention simplifies the process by excluding steps which are complex and not practically feasible.

2 cl, 7 dwg, 1 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a carbon nanocluster sulpho-adduct which is the polar solvent soluble fraction of the product of a reaction between ground coal-tar pitch and sulphuric acid, followed by washing the unreacted acid with water. The obtained product can be used for low-temperature carbonisation when filling porous bodies and modifying carbon fibres and fabric and as a concrete plasticiser modifier.

EFFECT: improved plasticising and water-reducing properties, powerful antiviral properties.

13 cl, 1 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a carbon nanocluster sulpho-adduct which is the polar solvent soluble fraction of the product of a reaction between ground coal-tar pitch and sulphuric acid, followed by washing the unreacted acid with water. The obtained product can be used for low-temperature carbonisation when filling porous bodies and modifying carbon fibres and fabric and as a concrete plasticiser modifier.

EFFECT: improved plasticising and water-reducing properties, powerful antiviral properties.

13 cl, 1 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a carbon nanocluster sulpho-adduct which is the polar solvent soluble fraction of the product of a reaction between ground coal-tar pitch and sulphuric acid, followed by washing the unreacted acid with water. The obtained product can be used for low-temperature carbonisation when filling porous bodies and modifying carbon fibres and fabric and as a concrete plasticiser modifier.

EFFECT: improved plasticising and water-reducing properties, powerful antiviral properties.

13 cl, 1 ex

FIELD: chemistry.

SUBSTANCE: thermoplastic foam material consists of expandable thermoplastic particles containing a polymer matrix which consists of a styrene polymer, polyolefin and a hydrogenated or non-hydrogenated styrene-butadiene block copolymer, which form a continuous phase rich in the styrene polymer and a dispersed phase rich in polyolefin. The foam material has cells with average size ranging from 50 mcm to 250 mcm. The cladding of the cells has a nano-cellular structure with pore diameter of 100-500 nm. The method of producing thermoplastic foam materials from said particles consists of the following steps: a) obtaining a polymer matrix by mixing said thermoplastic polymers, b) the obtained polymer matrix is saturated with a foaming agent and granulated to obtain expandable thermoplastic polymer particles, c) the expandable thermoplastic polymer particles are pre-foamed to obtain particles of foam material, and d) the pre-foamed particles of foam material are welded in a mould under the action of hot air or steam to obtain moulded articles from foam material consisting of particles at operating pressure which is set sufficiently low in order to preserve the nano-cellular structure in the cladding of the cells.

EFFECT: design of a method and obtaining expandable thermoplastic polymer particles with low loss of the foaming agent and high expandability, which can be processed to obtain foam materials made of particles with high flexural rigidity and good elasticity at the same time.

5 cl, 4 tbl, 2 dwg, 13 ex

FIELD: chemistry.

SUBSTANCE: invention can be used in motorcar, chemical, electronic and electrochemical industry, as well as hydrogen power engineering. First, nanoparticles of a metal catalyst - Pd, Pt, Ni, Ti, Fe, Co, Nb, Mo, Ta, W, Rh, Ru, Os, Ir, La, Mg and/or alloys thereof are placed in inter-fragment regions of carbon nanomaterial - graphite nanofibres or carbon nanotubes. The carbon nanomaterial is then cleaned from attached oxide-type functional groups by burning in an inert gas at 773 K. A layer of chemisorbed hydrogen with thermal desorption activation energy of about 1.2 eV is then formed on the inter-fragment surfaces and a layer of chemisorbed hydrogen with thermal desorption activation energy of about 2.5 eV is formed on graphene inner surfaces by holding the carbon nanomaterial in a current of gaseous molecular hydrogen at temperature of 773 K. Final hydrogenation of the carbon nanomaterial is carried out in a container at pressure, temperature and time of not more than 300 bar, 1000 K and 300 h, respectively, until obtaining 10 wt % or more of highly compact hydrogen with density in the order of 1 g/cm3 which is intercalated in the carbon nanomaterial.

EFFECT: invention reduces the pressure and temperature when producing highly compact hydrogen, enables to use simple, available and low power consumption equipment, and provides prolonged storage of hydrogen at room temperature.

2 cl, 3 dwg, 1 ex

FIELD: process engineering.

SUBSTANCE: proposed device comprises guide blocks 2 arranged in area of working roll pad height area 3, 3' on both sides in opening of every stand bed 1 to transmit force of bending and equalising cylinders 5 to working roll pads shifted axially and vertically. Expanded roll adjustment range is ensured by dividing guide blocks into top and bottom guide blocks 2, 2', fitting top guide blocks 2 to displace in stand bed opening 1, fixing bottom guide blocks 2' in said opening or fitting them to displace vertically. Every said block accommodates bending and equalising cylinder engaged with top and bottom pads of working rolls.

EFFECT: higher efficiency of adjustment at quarto stand.

4 cl, 4 dwg

Up!