Niobium-base alloy for forming 3d-products of complex shape and coatings
SUBSTANCE: composite niobium-based alloy, using for forming of 3d-products of complex shapes and the thermal barrier coatings contains wt %: zirconium: 1.36-2.04, vanadium: 2.64-3.96, indium: 1.0-1.6, cerium: 0.3-0.6, yttrium: 0.3-0.6, lanthanum: 0.3-0.6, tungsten carbide: 3.0-5.0, niobium - others. The alloy is obtained by introducing vanadium and zirconium in the form of intermetallic V2Zr in the amount of 4-6 wt %: indium - in the form of intermetallide InNb3 in the amount of 5.0-8.0 wt %, and tungsten carbide has fraction of 30-100 nm.
EFFECT: the alloy is characterized by high microhardness, which provides high durability in a wide temperature range, in particular from positive to negative temperatures.
2 cl, 1 tbl, 2 ex
SUBSTANCE: proposed alloy comprises inclusions of intermetallide phases Al3X, AlX, AlX3, where X is Ti, Zr, V, Fe, Ni sized to <10 mcm in amount of 5-20 vol. %, high-strength endogenous ceramic nano-sized particles of TiB2, TiC, Al2O3 sized to <50 nm obtained in adding them to the melt in amount of 0.1-2.0% of its weight and reinforcing discrete ceramic particles with average size of 14 mcm obtained in adding them to the melt in amount of 1-5% of its weight. Proposed method comprises mixing the powders of initial components to form in interaction one with another and with matrix aluminium melt the endogenous intermetallide and ceramic nano-sized particles and process additives represented by cryolite Na3AlF6 in amount of 0.1-0.2% and aluminium powder in amount of up to 30% of mix weight, pelletising the obtained composite mix, heating the pellets to 300±10°C, introducing them in matrix melt at 850-900°C and holding the melt before filling for 15-20 min.
EFFECT: improved tribological behavior at higher temperatures.
3 cl, 2 tbl
SUBSTANCE: proposed composition contains the following components in wt %: phosphorus copper - 0.5-2.0, titanium intermetallide Al3Ti - 0.5-2.0, aluminium making the rest.
EFFECT: decreased linear expansion factor, higher quality of castings.
FIELD: power engineering.
SUBSTANCE: charge for composite production contains the following components, wt %: aluminium 87-90; alkali 4-5; activating additive - 4-5; metal hydride 2-3.
EFFECT: using the proposed charge makes it possible to produce a composite with pores produced as a result of decomposition of magnesium hydride, which results in faster reaction of hydrogen production when using a composite.
SUBSTANCE: invention refers to wear-, erosion- and chemically resistant material on base of tungsten alloyed with carbon; also carbon in terms of total weight of material amounts from 0.01 wt % to 0.97 wt %. Material contains a matrix of tungsten with dispersed nano-particles of tungsten carbide of dimension not more, than 50 nm, mainly not more, than 10 nm. Material is produced by chemical sedimentation from gas phase onto a substrate. The substrate is arranged in the reactor of chemical sedimentation from the gas phase. The substrate is heated in a mixture of gases containing hexafluoride of tungsten, hydrogen, gas containing carbon, and, not necessary, inert gas. Also carbon containing gas is preliminary actuated by heating to temperature 500-850°C. Further, the substrate is cooled till there is formed a layer consisting of tungsten alloyed with carbon and fluorine.
EFFECT: high hardness and impact resistance.
37 cl, 10 dwg, 1 tbl, 9 ex
FIELD: manufacture of products made from structural metal materials reinforced with carbides.
SUBSTANCE: proposed method is performed by means of standard liquid metallurgy of finished parts or their blanks in form of castings, ingots, square blanks and slabs from Fe-based alloys, Ni-based alloys and Co-based alloys which are reinforced microstructurally by particles of complex molybdenum-titanium carbide added to molten alloy in melting furnace. After hardening of alloy, these particles are distributed inside grains of base metallic matrix, enhancing its mechanical properties both at room and an high temperature.
EFFECT: enhanced efficiency.
SUBSTANCE: invention relates to metallurgy, in particular to niobium-based eutectic composite materials strengthened by niobium silicides, intended for the production of heat-loaded articles and can be used in the aircraft and power industry. The niobium-based composite material strengthened by niobium silicides contains, at %: silicon 15.0-17.0; titanium 12.0-16.0; hafnium 2.5-5.5; aluminium 2.0-4.0; chrome 3.0-5.0; zirconium 4.0-6.0; molybdenum 8.0-12.0; yttrium 0.5-2.0; niobium - the rest. The composite material may contain niobium silicide Nb5Si3 and/or niobium silicide Nb3Si.
EFFECT: material is characterised by high values of short-term strength.
5 cl, 1 tbl, 1 ex
SUBSTANCE: heat-resistant material based on niobium and methods for its obtaining are proposed; the invention refers to metallurgy and can be used for production of parts of aerospace equipment operating at high temperatures. Heat-resistant material based on niobium is made in the form of alternating layers of solid solution of aluminium or silicon in niobium and layers of corresponding intermetallic compounds of niobium Nb3Al or Nb3Si, the thickness of which does not exceed 50 mcm. Method for obtaining heat-resistant material based on niobium involves assembly of a pack with alternation of niobium foil and aluminium foil and heat treatment of pack until layers of intermetallic compound Nb3Al are obtained or assembly of pack of niobium foil with one-sided coating of Si-powder. Besides, heat treatment is performed under pressure of 5-15 MPa in vacuum of 10-2-10-4 mmHg till layers of intermetallic compound Nb3Al and Nb3Si respectively are formed.
EFFECT: increasing strength owing to creating additional boundary lines in material.
5 cl, 8 dwg, 4 ex
SUBSTANCE: invention can be used for manufacture of parts of aerospace equipment, which operate at temperatures of up to 1600°C. Heat-resistant disperse strengthened alloy based on niobium and methods for its obtaining are described. Alloy contains niobium matrix inside which there located are disperse escapes of Al2O3 with diameter of up to 10 mcm at the following component ratio, wt %: Al - 0.1-20, O2 - 0.05-10, Fe, Cr, Cu, Ni, Ti, Cr, Mn - not more than 2.5 in total, Nb - the rest. Method for obtaining heat-resistant alloy based on niobium as per it. 1, which involves crushing of powder mixture, contains the following, wt %: Al - 0.1-20, Fe, Cr, Cu, Ni, Ti, Cr, Mn not more than 2.5 in total and niobium is the rest; first, in dry condition during 14-16 hours, and then in presence of acetone during 4-6 hours at ratio of weight of powders to weight of grinding balls of 1 : (8.5-11.5) till supersaturated solid solution Nb(Al) is formed; after that, the obtained mixture is compacted and sintered at temperature of 1650-1750°C during 20-60 minutes. Besides, sintering can be carried out in vacuum of 0.13-0.01 Pa or at pressure of 13.33-1.33 Pa in CO environment.
EFFECT: increasing ductility from room temperature to high temperatures and manufacturability of the material.
6 cl, 6 dwg, 6 ex
SUBSTANCE: manufacturing method of cast target for magnetron sputtering from tantalum-based alloy and target obtained using the above method is proposed. Method involves obtaining of an ingot of alloy on the basis of tantalum. First, tantalum ingot of high purity degree is obtained by means of deep vacuum refining by electron-beam drip re-melting of a workpiece made by pressing of high-purity tantalum powders; besides, ingots of intermetallic compounds TaFe2 and YFe3 are obtained by melting of tantalum with iron and yttrium with iron; after that, arc vacuum remelting of high-purity tantalum ingot with ingots of intermetallic compounds TaFe2 and YFe3 is performed at their ratio, wt %: TaFe2 3.0-10.0, YFe3 0.3-3.0, Ta - the rest; ingot of tantalum-based alloy with composition of Ta + 1 wt % Fe + 0.1 wt % Y is obtained and subject to machining.
EFFECT: improving the quality of sputtered targets in order to increase the yield ratio of thin-film capacitors.
2 cl, 1 tbl, 1 ex
FIELD: non-ferrous metallurgy.
SUBSTANCE: invention refers to the area of non-ferrous metallurgy and can be used for titanium alloys production. It claims the ligature for titanium alloys. The ligature contains % w/w: niobium 60.0-70.0, aluminum 27.0-38.0, carbon 1.0-3.0, admixtures - the rest. The admixtures of ligature include, % w/w: iron ≤0.18, silicon ≤0.19, oxygen ≤0.07%.
EFFECT: decrease of melting temperature and density of ligature for ensuring its physical characteristics close to titanium as well as increase of its workability including crushing capacity.
1 dwg, 1 tbl, 1 ex
SUBSTANCE: there is prepared mixture of niobium and silicon powders which is successively compressed. Compressed mixture is adjoined to an electrode containing niobium. During following vacuum-arc re-melting the mixture is merged with the electrode. The melted electrode is cooled and there is formed an ingot of alloy. The ingot is thermo-mechanically processed and annealed at 950-1150 °C facilitating at least 75 % of re-crystallisation. The ingot can be produced by melting niobium, by introduction from 0.1 to 100 ppm (part per million) of silicon into melt and by melt cooling. Cups of deep drawing and targets of ion sputtering are produced from this ingot.
EFFECT: fabrication of totally re-crystallised semi-finished product of niobium with fine and uniform by size grain.
22 cl, 11 dwg, 1 tbl, 1 ex
SUBSTANCE: invention refers to metallurgy and can be implemented for fabricating items operating under conditions of mechanical stresses at higher temperatures. To upgrade strength of alloy under conditions of higher temperatures the alloy has the following composition, wt %: molybdenum 8.5-9.5; zirconium 2.0-3.0; carbon 0.01-0.03; nitrogen 0.05-0.1; lanthanum 0.1-0.15; rhenium 1.3-1.7; boron 0.005-0.01; niobium- the rest. Ultimate stress of alloy at 1200°C is 23-24 kg/mm2.
EFFECT: upgraded strength of alloy.
SUBSTANCE: high temperature durable niobium wire, alloyed by 50-2000 microgram /g phosphor, is received by means of elongation of niobium alloy. Niobium alloy addition by phosphor or phosphor-bearing ligature is implemented at melting or by sintering of niobium with phosphor. Wire also can be elongated from material, received by sintering of provisionally alloyed by phosphor niobium powder. In wire structure it is kept stability of grain size at temperature higher than 1400°C.
EFFECT: high strength characteristics of material, electrical properties of material comparable to properties of absolute niobium.
9 cl, 3 dwg, 1 tbl, 1 ex
FIELD: manufacture of parts operating at mechanical loads and elevated temperatures, for example parts of engines.
SUBSTANCE: niobium alloy contains next components, mass.%: molybdenum, 8.5 - 12.5; zirconium, 2.0 - 4.0; carbon, 0.1 - 0.3; nitrogen, 0.05 - 0.1; lanthanum, 0.03 - 0.05; hafnium, 10.0 - 15.0; ruthenium, 0.05 - 0.15; niobium, the balance.
EFFECT: improved strength of alloy in condition of elevated temperatures.
FIELD: manufacture of parts of engines, furnaces and other articles operating in condition of elevated temperature at high mechanical loads.
SUBSTANCE: alloy contains next components, mass.%: molybdenum, 8.5 - 12.5; carbon, 0.1 - 0.3; nitrogen, 0.05 - 0.1; lanthanum, 0.03 - 0.05; chrome, 4.0 - 5.0; rhenium, 4.0 - 5.0; rhodium, 0.1 - 0.2; niobium, the balance.
EFFECT: improved strength of alloy at elevated temperatures.
FIELD: metallurgy, aluminothermic process, in particular manufacturing of refractory metal-based addition alloys for doping of titanium-based alloys.
SUBSTANCE: claimed batch contains refractory metal high oxides, aluminum powder, calcium oxide and fluoride-based fluxing agents, refractory metal low oxides and ballast additives if form of addition alloy and/or titanium powder or sponge waste returns. Vanadium trioxide and/or molybdenum dioxide are used as refractory metal low oxides. According to this invention, it is made possible to increase recovery degree of valuable components by 1.5-2.0 % and decrease refractory metal oxide content in dross. Utilization of addition alloy crumb returns makes it possible to increase the ingot-to-product yield by 2-4 %.
EFFECT: addition alloys with improved quality.
2 cl, 4 ex, 3 tbl