Nanostructured powder wire
SUBSTANCE: on the external and/or internal surface of the metal shell of power wire there is a nanocomposite coating in the form of a metal matrix with a mixture of nanosize particles of metal fluoride and rare earth metals distributed in it. The charge placed in the cavity of the shell comprises slag-generating, gas-generating, ionising and alloying components. The specified coating has the following ratio of volumes of the matrix and nanosize particles, %: metal matrix 55-98, nanosize particles of metal fluoride 1-30, nanosize particles of rare earth metals 1-15.
EFFECT: wire has good welding-technological properties, makes it possible to improve atomised transition of electrode metal and makes it possible to improve mechanical properties of welded connections.
2 cl, 2 tbl, 1 dwg
The present invention relates primarily to mechanical engineering and can be used in arc welding and cladding of metal parts.
Known welding electrode wire (Paton, B. E., N. Voropai.M., Nikiforov, B. A. and other Welding electrode wire. UK 35/06, 35/10. USSR author's certificate No. 1696231 from 09.02.1987, bull. No. 45 dated 07.12.1991 year). This wire consists of a metal rod with the internal channel, the cavity of which is filled with slag-forming and alloying components, and the external and internal surfaces of the rod applied metal coating. This wire improves droplet transfer of electrode metal, but it is not in the composition of the activating flux and is not able to increase the depth of penetration of the metal. In addition, the wire has no gas-forming components and may only be used when welding in shielding gases, and its production has a high complexity, which increases the cost of the wire.
Known wire for welding (N. Voropai.M., Buchinskaya C. N., Kosteniuk N. And. and other Wire for welding. UK 35/08, USSR Author's certificate No. 916191 from 02.02.1980, bull. No. 12 of 30.03.1982 g) having an inner cavity filled with activating flux, which is surrounded by two metal shells. This wire improves droplet transfer e is estradiolo metal and is able to increase the depth of penetration of the metal. However, this wire also has no slag-forming and gas-forming components and may only be used when welding in shielding gases, and its production has a high complexity, which increases the cost of the wire.
Known composite electrode wire for welding and surfacing (Parshin S. G., Parshin S. C. Composite electrode wire. IPC WC 35/368, WK 35/10. RF patent №2355543 from 09.07.2007 g), which was adopted for the prototype. This wire consists of a metal tube placed in the cavity of the charge of a mixture of slag-forming and gas-forming components. On the surface of the metal tube is coated with a composite coating of a metal matrix with distributed it dispersed phase of the activating flux. This wire allows you to increase the depth of penetration of the metal and to improve drip transfer of electrode metal in the weld pool.
However, the wire on the prototype is not in the charge of ionizing and alloying components, resulting in poor arc stability and mechanical properties of the weld metal. For the deposition of composite coatings for prototype use fine activating flux with particle size greater than 50 microns, which contains hygroscopic chlorides and bromides, which degrades the durability of the coating and uvelichenie is its roughness. In addition, this wire is made from a solid metal tube, which increases the complexity and cost of manufacture of the wire.
The technical result of the invention is the improvement of droplet transfer of electrode metal and the mechanical properties of weld metal due to the introduction of the charge of ionizing and alloying components, and applying to the surface of the wire nanocomposite coatings containing nano-sized particles of a fluoride, and rare earth metals.
The essence of the invention lies in the fact that the flux-cored wire shell place nanocomposite coating, and in the cavity of the shell powder mixture, of a mixture of mineral components and ferroalloys. Unlike the prototype, flux-cored wire is made of steel strip, which is bent in the form of a closed hollow section circular cross-section, which has a longitudinal seam edges. The cavity profile, fill with a mixture of slag-forming mixture, the gas, ionizing and alloying components, and on the surface of the shell is applied nanocomposite coating consisting of a metal matrix nano-sized particles of metal fluoride and a rare earth metal with a particle size less than 1000 nm.
As the metal matrix used is copper, Nickel, titanium. These metals have high plasticity, which is characterized by relative elongation tensile metal: copper (about 45%), Nickel (about 40%), titanium (about 40%). High plasticity of these metals allows for the electrochemical machining to form a metal rod dense nanocomposite coating with high adhesion by reducing internal stresses and obtain a fine-grained microstructure.
As the metal fluoride used fluoride salts of alkali and alkaline earth metals, such as CsF, LiF, KF, NaF, CaF2, MgF2, SrF2, BaF2. When welding fluoride salts decompose with the release of significant amounts of fluoride, which promotes intensive metallurgical reactions by binding of molecules, atoms and ions of hydrogen with the formation of gaseous hydrogen fluoride HF, which reduces the residual level of diffusible hydrogen, the formation of defects and improves the quality of welded joints. Formed by the decomposition of alkaline and alkaline-earth metals have low ionization potentials: Cs (3,88 eV), Li (lower than the 5.37 eV), K (4,32 eV), Na (5,12 eV), CA (6,09 eV), Mg (to 7.61 eV), Sr (5,67 eV), BA (5,19 eV), which improves the arc stability and reduces the arc voltage.
In addition, the fluorides of alkali and alkaline-earth metals to reduce the surface of the ing the tension of the molten metal, which contributes to size reduction of the droplets of the metal electrode during welding (see Lepinski B. M., Manakov, A. I. Physical chemistry of the oxide and akceptowalnym melts. M.: Nauka, 1977. - 192 S.).
Nanocomposite coating has the following volume ratio of the matrix and nano-particles in the coating, %:
Metal matrix - 55-98;
Nanosized particles of metal fluoride - 1-30;
Nano-sized particles of rare earth metals - 1-15.
When the amount of fluoride less than 1% no impact composite coating on the process of droplet transfer and destruction of hydrogen, while increasing the amount of more than 30% reduced arc stability. When the amount of rare earth metals is less than 1% reduced the influence of the coating on the processes of modification and improvement of the microstructure of the weld metal, while increasing the volume more than 15% deterioration in the mechanical properties of the weld metal and the electrical conductivity of the composite coating.
This combination of known and new features can improve drip transition, arc stability and mechanical properties of the weld metal. This is possible because when heated, the mixture of slag-forming and gas-forming components of the slag and carbon dioxide, which push the air of the atmosphere and prevent its penetration in C is well-welding. Contained in the charge ionizing components, for example potassium carbonate, lithium carbonate, sodium carbonate increase the degree of ionization of the arc, and the stability of combustion. The alloying components of the charge, such as ferroalloys, FeMn, FeSi, FeTi, promote alloying the weld pool manganese, silicon, titanium, which increases the strength and ductility of the weld metal.
Nanocomposite coating consisting of a metal matrix and nano-sized particles of a fluoride, and rare earth metals improves drip transition by reducing the interfacial tension of the molten shell. Fluoride binding molecules, atoms and ions of hydrogen with the formation of hydrogen fluoride HF, which reduces the formation of defects and improves the mechanical characteristics of the welded joints.
Nano-sized particles of rare-earth metals are transferred from the coating to the weld pool, and help to get fine-grained microstructure, which increases the ductility and impact toughness of welded joints.
The present invention is illustrated in the drawing, which shows a view of nanostructured cored wire with nanocomposite coating and the charge of slag-forming mixture, the gas, ionizing and alloying components, see figure 1. We offer wire sostoi the metal shell 1 to junction 2, the cavity of which is filled with mixture 3. On the surface of the shell are external and internal nanocomposite coatings 4, 5, consisting of a metal matrix 6 distributed by volume of the matrix with nanosized particles of fluoride metal and rare-earth metals 7.
The purpose of the invention is achieved in that on the surface of the cored wire is placed nanocomposite coating consisting of a metal matrix and nano-sized particles of a fluoride, and rare earth metals with particle size less than 1000 nm, and the cavity of the shell is filled with a batch of slag-forming mixture, the gas, ionizing and alloying components.
During melting of the slag coating film of fluoride, which helps to reduce the interfacial tension of the molten metal (see Lepinski B. M., Manakov, A. I. Physical chemistry of the oxide and akceptowalnym melts. M.: Nauka, 1977. - 192 S.). As a result of this reduced diameter drops and increases the frequency of droplet transfer.
Contained in the charge ionizing components, for example potassium carbonate, lithium carbonate, sodium carbonate increase the degree of ionization of the arc, and the stability of combustion. The alloying components of the charge, such as ferroalloys, FeMn, FeSi, FeTi, promote alloying the weld pool manganese, kremna is, titanium, participate in reactions of reduction, removal of oxides, associated impurities of sulfur and phosphorus. These processes lead to an increase in the strength and ductility of the weld metal (see Petrov, L. Welding materials. M: mechanical engineering, 1972 - 280 C.).
The introduction of rare earth metals (REM) - cerium, yttrium, lanthanum, scandium improves the mechanical properties of weld metal by microalloying and modification of the microstructure. Nanoparticles of rare-earth metals have a large specific surface area, which promotes intensive metallurgical refining reactions by binding the residual gases, sulfur, phosphorus refractory compounds (see Kachanov E. B. State and prospects of development of heat-resistant alloys for turbine blades. The technology of light alloys, 2005, No. 1-4, S. 10-17).
Production technology, we offer wire based on using known industry methods. For the manufacture of flux-cored wire used for plastic deformation of the metal strip in a rolling mill with simultaneous filling of the charge to bend the tape, followed by compression to the formation of a closed shell with a longitudinal seam edges. Then the semi-finished product with the charge is subjected to drawing to reduce the outer diameter of the wire (see pokhodnya, I. K., and etc. welding of the powder provoloka is. - Kiev: Naukova Dumka, 1972, 224 S.).
For the deposition of nanocomposite coatings using the method of electrochemical deposition of composite coatings from an electrolyte containing colloidal nano-sized particles (see Saifullin R. C. Composite electrochemical coatings and materials. M. Chemistry, 1972, 168 S. and Poole Am, Owen F. Nanotechnology. transl. from the anl. M: Technosphere, 2005. - 336 S.). Purified after drawing cored wire is immersed in the electrolytic bath, which contains colloidal electrolyte solution, with nanosized particles of size less than 1000 nm in the desired concentration. Cored wire is connected to the negative pole of the power source. When the action electropolymerization forces on the wire surface are deposited nano-sized particles of a fluoride, and rare earth metals, which sarasaviya positive ions recovered from the electrolyte of the metal. For uniform distribution of nano-particles in the volume of the electrolyte bath rinsed with argon. As a result, the wire is formed nanocomposite coating thickness of 1-100 μm with evenly distributed over the volume of the matrix of the nanosized particles. Internal nanocomposite coating is applied before surgery plastic deformation on the steel tape on the similar technology.
As an example, note the measures proposed nanostructured cored wire can result in mechanized welding of plates of steel st3sp thickness of 4; 6 mm
As the basis for the manufacture of the shell of the wire used has a very mild cold-rolled steel tape thickness 0.4 mm width 10 mm of steel 08KP according to GOST 3560-73. The steel was placed in a rolling mill, comprising a rotating blocks with the profile surface. A mixture consisting of slag-forming, gas-forming, ionizing, the alloying components of the system: CaF2-Caso3-K2CO3-FeMn fell asleep in the deformable ribbon and formed a closed shell of circular cross section with a longitudinal seam edges with a diameter of 4.5 mm, Then the semi-finished product of the metal shell with the mixture was subjected to the repeated drawing through a system of carbide dies. The result was cored wire with a diameter of 1.6 mm After degreasing cored wire was placed in an electrolytic bath containing a colloidal solution of a copper-containing electrolyte and nano-sized particles of lithium fluoride LiF and yttrium oxide Y2O3. If the shutter speed wire within 5 minutes on the surface of the formed composite coating thickness of 10 μm, consisting of a copper matrix and nano-sized particles. Nanostructured cored wire was tested in mechanized welding in carbon dioxide plates of steel SP size of 150×300 mm thick 4; 6 mm with the use of semiautomatic PDG-312-4 source p is Tania EDC-303 and torch ESAB-PSF.
Studies drip transition produced when welding on a rotating tube with a camera "PCI 8000S Motion Scope" lens "Lens-18-108" with imaging frequency 2000 Hz, the light emitter of the lamp HBO-200V OSRAM and convex lens, see table 1. Mechanical testing of samples was performed on a tensile testing machine "Zwick SM ZO50/TH3S" with the help of the software TestXpert V 10.0", see table 2.
Thus, the proposed nanostructured cored wire provides a technical effect, which is reflected in the improvement drip transition and mechanical properties of welded joints can be made and applied using means known in the art, therefore, it has industrial applicability.
1. Flux cored wire for welding and surfacing consisting of a metal shell with a nanocomposite coating, made in the form of a metal matrix with distributed it with a mixture of nanoscale particles in the cavity where the mixture of slag-forming and gas-forming components, wherein the mixture further comprises ionizing and alloying components, and the nanocomposite coating includes nano-sized particles of metal fluoride, and rare earth metals in the following ratio of volumes Matri is s and nanoscale particles in the coating,
|Nanosized particles of metal fluoride||1-30|
|Nano-sized particles of rare-earth metals||1-15|
2. Flux cored wire under item 1, wherein the nanocomposite coating deposited on the outer and/or inner surface of the metal shell.
SUBSTANCE: method of obtaining biodiesel fuel includes preparation of vegetable oil with heating to temperature 80°C, carrying out alkaline ethanolysis by means of potassium hydroxide with obtaining ether-glycerol mixture, which is separated with obtaining two fractions of glycerol and mixture of ethers, mixture of ethers is subjected to filtration, sorption purification and dehydration, obtained biodiesel fuel is stored. Filtration, sorption purification and dehydration are performed in two stages, at the first stage mixture of ethers is placed into centrifuge, rotated at angular velocity 0.5-0.7 rev/min for 0.5-0.6 hour, with mixture being separated into light and heavy fractions, heavy fraction is drained, at the second stage light fraction is placed into another centrifuge, charge, consisting in wt % of carbon nanomaterial "Taunit" - 1-1.5% and natural bentonite material - the remaining part, is added into it with volume ratio 1:10, centrifuge is rotated at angular velocity 1.1-1.3 rev/min for 1.0-1.2 hour, with removal of heavy fraction remains.
EFFECT: application of two-stage filtration of mixture of ethers with charge makes it possible to increase quality of biodiesel fuel, output, prolong resource of engine operation with reduction of harmful emissions into atmosphere and economical consumption of fuel resources.
SUBSTANCE: nanocomposite material contains, wt %: mineral binder 83.7-83.9, mineral filler 2.1-2.3, fraction of carbon nanoparticles 0.00002, distilled water 13.79998-14.19998.
EFFECT: improvement of material characteristics, providing protection from neutron radiation flows, provision of technological mobility of working mixture in the process of pouring construction elements.
SUBSTANCE: nanocomposite coating including a metal matrix with nanosize particles of metal fluoride and rare earth metals distributed in it is electrolytically applied onto a metal rod of the electrode. The specified coating has the following ratio of volumes of the matrix and nanosize particles, %: metal matrix 55-96, nanosize particles of metal fluoride 3-30, nanosize particles of rare earth metals 1-15. An additional composite coating may be applied onto the surface of the coating, which is made of metal matrix with nanosize particles of metal fluoride distributed in it.
EFFECT: welding wire has good welding-technological properties, makes it possible to improve drop transition of electrode metal and mechanical properties of welded connections.
2 cl, 1 dwg, 2 tbl
SUBSTANCE: coating in the form of electrolytically produced nanocomposite is applied onto a metal rod, including a metal matrix with nanosize particles of activating flux evenly distributed in it, containing fluoric compounds, and nanosize particles of carbide or a mixture of carbides. The coating has the following ratio of volumes of the matrix and nanosize particles, %: metal matrix 30-92, nanosize particles of activating flux 3-5, nanosize particles of carbide 5-65. Carbide or a mixture of carbides are selected from the following group: tungsten carbide, chrome carbide, molybdenum carbide, vanadium carbide, titanium carbide, niobium carbide, hafnium carbide, tantalum carbide, boron carbide, zirconium carbide.
EFFECT: wire has good welding-technological properties, provides for atomised transition of electrode metal and makes it possible to increase hardness of a wear resistant layer aimed at surface of parts working under intensive impact-abrasive wear.
2 cl, 1 dwg, 1 tbl
SUBSTANCE: invention relates to bio-compatible conjugated polymer nanoparticle, dicarbonyl-lipid compound, compound in form of vesicles, micelles or liposomes, containing multitude of nanoparticles, including said dicarbonyl-lipid compound, method of treating cancer or metastases, biocompatible polymer, as well as to conjugate. Biocompatible conjugated polymer nanoparticle includes main chain of copolymer, with at least one polymer monomer containing two side chains, selected from the group, consisting of carboxylic acid, amide and ester, and sad side chains are separated from each other by 1-1- carbon atoms, oxygen atoms or sulphur atoms, or their any combinations. Said nanoparticle further contains multitude of side chains, covalently bound with said main chain, with said side chains being selected from the group, consisting of monosaccharides, dicarboxylic acids, polyethyleneglycol and their combinations; and multitude of platinum compounds, dissociatedly bound with said main chain. Multiple platinum compounds are connected with said main chain via at least one coordination bond between carbonyl oxygen of carbonyl or amide group of main chain and platinum atom of platinum compound. Said platinum compound is selected from Pt(II) compounds, Pt(IV) compounds and any their combinations. Invention is also aimed at dicarbonyl-lipid compounds, in which platinum compound is dissociatedly bound with dicarbonyl compound. Invention is also aimed at method of treating cancer and metastases. Methods include selection of subject, requiring treatment of cancer or metastases, and introduction to subject of effective amount of nanoparticles, compounds or compositions of the invention.
EFFECT: obtaining biocompatible conjugated polymer nanoparticles for chemotherapeutic platinum-based preparation.
40 cl, 1 tbl, 29 dwg, 12 ex
SUBSTANCE: invention refers to biotechnology, particularly to a microorganism test in various objects and media. The method provides conjugating electrically Fe0, MgFe2O4 or Fe3O4 labelled bacteria in an aqueous medium at specified parameters. Unbounded nanoparticles are separated with using a magnetic field, and a working electrode made of gold, platinum or graphite-bearing materials and having a surface pre-modified by antibodies specific to a bacterial strain to be tested is immersed into an analysed solution. The electrode is kept at the specified parameters to form an immune complex on its surface and washed in a buffer solution containing normal horse serum and Tween-20. The electrode is removed from the solution and placed into a cell containing LiClO4, dissolved in acetonitrile, dimethyl formamide or dimethyl sulphoxide; the bacterial count is determined by a value of analytical oxidation of the nanoparticles localised in the immune complex on the surface of the working electrode.
EFFECT: invention enables providing higher analysis sensitivity, better output and simplified analysis procedure.
7 dwg, 6 ex
SUBSTANCE: method of obtaining of nano-dispersed nickel-plated powders in a flow of low-temperature nitric plasma includes placing into the batcher of piston type of powdered initial reagent and its feeding by pneumatic current into the evaporator chamber, treatment in the evaporator chamber by low-temperature nitric plasma, refrigeration of the evaporation product in the nitrogen flow in water-cooled hardening chamber located in the bottom part of the evaporator, and its trapping with the filter. The initial reagent is a mix of carbide or vanadium nitride and metal nickel taken in the ratio, by wt %: carbide or vanadium nitride - 50÷75, metal nickel - 25÷50. Meanwhile the plasma temperature in the evaporator chamber is equal to 4000-6000°C, plasma flow rate is 50-55 m/s, and initial reagent is supplied with the flow rate 150-200 g/h.
EFFECT: obtaining of heterogeneous nano-dispersed nickel-plated powders of carbide or vanadium nitride, with the size of particles less than 100 nm.
6 dwg, 2 ex
SUBSTANCE: aluminium or aluminium-magnesium alloy is molten in a melt of halides of alkali and/or alkali-earth metals, which contains 0.4 to 30 wt % of carbides of metals or non-metals with particle size of 100 nm to 200 mcm, during 0.5-5 h at the temperature of 700-750°C.
EFFECT: invention allows obtaining a homogeneous composite material having low porosity and good sintering ability at reduction of temperature of the process.
FIELD: physics, optics.
SUBSTANCE: invention relates to optoelectronic engineering and can be used to form an active layer of thin-film solar cells based on hydrogenated silicon with stable parameters relative to light stimulus, particularly solar radiation. The invention consists in a method of forming films of amorphous hydrogenated silicon with a small fraction of silicon nanocrystals (volume ratio of the crystalline phase to the amorphous phase of less than 15%), uniformly distributed in the film and having a size of not more than 10 nm. The method includes depositing the amorphous silicon films by plasma-chemical deposition from a gaseous mixture of silicon tetrafluoride and hydrogen at high pressure in a reaction chamber in conditions which enable to form silicon nanocrystals in the glow-discharge plasma. The presence of a small fraction of uniformly distributed nanocrystalline inclusions in the amorphous matrix markedly improves the stability of electrical, optical and photoelectric properties of the obtained material.
EFFECT: high efficiency and longer service life of thin-film solar converters when an active layer of the material obtained using the said method is used on the said converters.
2 dwg, 1 tbl
FIELD: process engineering.
SUBSTANCE: invention relates to material crushing means. Proposed method implemented in this device comprises the step that follow. Material is mixed with water and placed into dispersion chamber. The latter is sealed to feed 5-30 atm of static pressure therein. Contents of said chamber is processes with ultrasound vibrations at insonation density of at least 50 W/cm2 to bring sound pressure to said mix of material with water that is higher than said static pressure 2 to 3 times.
EFFECT: homogeneous particles in the range of tens of nm.
10 cl, 2 dwg
SUBSTANCE: charge in wire steel cover contains the following component ratio, wt %: rutile concentrate 25-37; calcium fluoride 8-17; iron powder 32-45; ferromanganese 5-9; nickel 1-3; alkaline metal carbonate 3-7, alkaline metal complex fluoride 3-13.
EFFECT: wire has good welding processing characteristics, it provides microdrop transfer of molten metal, arc stability and better formation of welded seal and quality of welded joints due to active metallurgic reactions on binding of water with hydrogen.
3 cl, 1 tbl
SUBSTANCE: charge in steel cover contains the following component ratio, wt %: rutile concentrate 23-42; ruddle 18-27; iron powder 28-42; ferromanganese 3-8; nickel 3-5; alkaline metal complex fluoride 5-18.
EFFECT: wire has good welding processing characteristics, it provides microdrop transfer of molten metal, arc stability and higher quality of welded joints due to active metallurgic reactions on binding of water vapour with hydrogen.
2 cl, 1 tbl
FIELD: process engineering.
SUBSTANCE: invention relates to metallurgy, particularly, to powder wire for making of heat-resistant coating by arc metallisation for parts operated at high-temperature gaseous corrosion. Powder wire for application of said coatings on said parts composed of steel shell and core. To up heat-resistance of applied coatings the core is made of the charge containing the following elements in wt %: aluminium powder "ПА4" 3-7%, metal chromium "Х99Н1" 23-27%, ferrotitanium "ФТи70С05" 0.5-1.2%, ferrosilicum "ФС90" 0.8-1%.
EFFECT: higher heat resistance.
1 tbl, 1 ex
SUBSTANCE: invention relates to surfacing by submerged arc for recovery of worn-out parts and production of protective coating at equipment operated at compression and abrasion loads at 600°C. Proposed composition contains the following substances, in wt %: steel shell - 67.0-68.0, ferrotungsten - 10.0-13.75, ferromanganese - 0.76-1.41, ferrosilicum - 0.26-1.34, ferrochromium - 3.38-5.38, ferrovanadium - 0.4-1.0, nickel - 0.1-1.0, carbon-fluoride-bearing powder of electric precipitator of aluminium production - 0.80-2.58, iron powder making the rest.
EFFECT: higher wear resistance and hardness, stable arc, improved formation of built-up metal.
SUBSTANCE: invention relates to surfacing by submerged arc for recovery of worn-out parts and production of protective coating at equipment operated at compression and abrasion loads at 600°C. Proposed composition contains the following substances, in wt %: steel shell - 67.0-68.0, ferromanganese - 0.50-1.2, ferrosilicium - 1.0-1.75, ferrochromium - 7.2-9.1, ferromolybdenum - 1.5-2.3, ferrovanadium - 0.6-0.8, carbon-fluoride-bearing powder of electric precipitator of aluminium production - 0.70-1.20, iron powder making the rest.
EFFECT: higher wear resistance and hardness, ruled out cold cracking decreased hydrogen content in built-up metal, extra gas protection.
SUBSTANCE: invention relates can be used for arc surfacing of equipment and tools operated at thermomechanical cyclic loading of, for example, the parts of copper teeming machines, hot forming machines, hot rolling rolls, etc. Powder wise consists of low-carbon steel shell made of Armco-iron and powder sharge. Proposed wire contains components in the following ratio in wt %: chromium - 15-18; molybdenum - 3-5.5; nickel - 2-6; manganese - 2-4; ferrosilicon - 0.8-2.5; ferrovanadium - 1.5-3.5; titanium - 0.5-1.0; aluminium - 0.5-1.0; boron carbide - 0.3-0.8; titanium diboride - 1.0-2.0; zirconium diboride - 0.5-1.5; sodium fluorosilicate - 0.5-1.0; iron powder - 0,5-7,5, steel shell making the rest. Surfacing by powder with above described charge can be performed in argon or by hidden arc welding.
EFFECT: higher hardness and longer life of tools operated at thermomechanical cyclic loading.
2 dwg, 2 tbl
FIELD: process engineering.
SUBSTANCE: invention relates to welding wire from stainless steel with flux core for welding zinc-coated steel sheet. Said wire comprises shell from stainless steel filled with flux. Total content of elements introduced in the form of metals or alloys into said shell and said flux, relative to total weight of welding wire, makes, in wt %: C - 0.01-0.05, Si - 0.1-1.5, Mn - 0.5-3.0, Ni - 7.0-10.0, Cr - 26.0-30.0, Fe and unavoidable impurities making the rest. Magnitude F defined the formula given below makes 30-50, F = 3×[Cr%] + 4.5×[Si%]-2.8×[Ni%]-84×[C%]-1.4[Mn%]-19.8 , where [Cr%], [Si%], [Ni%], [C%] and [Mn%], respectively, define total content of Cr, Si, Ni, C and Mn in wire shell and welding wire relative to total weight of the wire. Note here that said flux comprises the following slag-forming materials in wt % with respect to wire total weight: TiO2 - 3.8-6,8%, SiO2 - 1.8-3.2%, ZrO2 - 1.3% or smaller, including 0%, Al2O3 - 0.5% or less, including 0% and total content of said slag-forming materials makes 7.5-10.5%, note here that content of TiO2 makes 50-65% with respect to total weight of slag-forming materials.
EFFECT: ruled out cracking of weld seam, higher hardness and elasticity.
5 cl, 6 dwg, 5 tbl, 2 ex
FIELD: process engineering.
SUBSTANCE: invention relates to welding. Welding electrode comprises metallic electrode part and flux part adjacent thereto. Self-protected welding electrode comprises rare-earth aluminide in said flux and/or electrode part in amount of about 0.5 wt % to 15 wt % of flux part. Said aluminide is selected from the group consisting of cerium aluminide, lanthanum aluminide, neodymium aluminide and cerium-iron aluminide and combinations thereof. Presence of rare-earth aluminide inhibits an ingress of oxygen and nitrogen into weld seam metal and does not notably affect phase changes in metal.
EFFECT: better performances.
13 cl, 3 dwg
FIELD: process engineering.
SUBSTANCE: invention relates to arc surfacing of tools and part operated at high specific pressures and increased temperatures. Powder wire consists of low-carbon steep shell and powder fusion mix at the following ratio of components in wt %: chromium - 20.0-23.0, nickel - 6.0-8.0, ferromolybdenum - 8.0-9.0, ferrotitanium -0.2-0.6, nitrided chromium - 2.0-3.0, ultrafine powder of titanium carbonitride - 0.2-0.6, sodium fluorosilicate - 0.8-1.0, iron -1.3-9.3, shell low-carbon steel making the rest. Said ultrafine powder of titanium carbonitride features particle size of 0.01-0.1 mcm.
EFFECT: higher heat resistance of built-up metal, reduced resource intensity of building up.
2 dwg, 2 tbl, 1 ex
FIELD: process engineering.
SUBSTANCE: invention relates to arc deposition of wear resistant alloys and may be used for increasing durability of parts operated at friction in contact with aggressive media. Proposed powder wire consists of low-carbon steel shell and powder mix including the following ratio of components in wt %: chromium 14-18; nickel 2-4; manganese 2-3; ferroniobium 1-2; molybdenum 3-5; ferrotitanium 1.5-3; ferrosilicon 1-2; boron carbide 0.6-1; sodium fluorosilicate 0.5-1; iron powder 4.2-18.7, and steel shell making the rest.
EFFECT: higher durability of parts operated at friction in contact with aggressive media.
1 dwg, 3 tbl
FIELD: restoration of worn parts of low carbon and low alloy steels operating in condition of abrasive wear and impact loads, applying of wear resistant coating.
SUBSTANCE: power wire includes steel envelope and powder like charge having components taken at next relation, mass %: ferrotitanium, 1 - 3; metallic chrome, 6 - 7; ferrosilicon, 0.3 - 0.5; ferromanganese, 1.5 - 2.5; graphite, 0.3 - 0.5; molybdenum, 0.8 - 1.5; fluorspar, 2.0 - 4.5; fieldspar, 0.3 -1.5; hematite, 0.3 - 1.0; steel envelope, the balance. Such wire allows to surface thin and small-size parts in shops, in field and installation condition at lower and vertical positions without using shield gas.
EFFECT: enhanced quality of surfaced parts.