Alloy for hydrogen absorption and desorption
SUBSTANCE: alloy contains, wt %: titanium 46.3-49.0; copper 0.14-4.5; aluminium 0.15-4.7; calcium 0.03-1.0; magnesium 0.03-0.9; iron - the rest.
EFFECT: increased activity of alloy and its sorption capacity.
The invention relates to the field of metallurgy, in particular to compositions of alloys based on titanium used for the absorption and desorption of hydrogen, for the purpose of its application in energy devices that consume hydrogen, and chemical processes.
Promising a battery and a source of hydrogen among base alloys titanium is an intermetallic compound TiFe, characterized by the availability and low cost [1, p. 259, 265].
The disadvantage of this alloy is that it shows very low activity at the initial stage of hydrogenation, which makes it necessary to conduct complex degassing of the alloy are Present prior to hydrogenation reaction.
The prior art discloses a degassing treatment consists of heating the alloy at 350aboutWith or at even higher temperatures for several hours; while, in the working chamber, where degassing is carried out, must be created in a vacuum with a residual pressure of ~ 0,133 PA (10-3mm Hg. calendar) or at even lower residual pressure.
In addition, even if the hydrogenation starts, TiFe alloy exhibits a very slow rate of reaction with hydrogen, and it can take from 3 to 10 weeks to complete the reaction of hydrogenation .
Known alloy based on intermetallic compound TiFe with copper, the composition of which is described by the formula TiFeFor 0.9CuA 0.1. Ibid wook�ivalsa, what this alloy is considerably improved as compared with TiFe more rapid achievement of the early hydrogenation and greater speed of reaction with hydrogen. The chemical composition of the alloy TiFeFor 0.9CuA 0.1adopted for the prototype, the following, wt. %: titanium 45,8-45,9; copper 6,0-6,1; iron - the rest. Its sorption capacity for hydrogen desorption (400C) is - 0,938 wt. % H2[3, p. 186], which corresponds to the volume of the hydrogen - 106 DM3N2/kg of the alloy.
Alloy TiFeFor 0.9CuA 0.1(prototype) has a very low sorption capacity, as also indicated in the patent .
The object of the invention is the determination of the activation time of the alloy and increase its sorption capacity.
The technical result is achieved in that the alloy containing titanium, iron and copper, additionally contains aluminum, calcium and magnesium in the following ratio of components, wt. %: titanium 46,3-49,0; copper 0,14-4,5; aluminum 0,15-4,7; calcium 0,03-1,0; magnesium 0,03-0,9; iron - the rest.
Was previously made by the ligature, which was fully included aluminum, copper, calcium and magnesium. The proposed alloy can be expressed by the formula TiFe1-XAndX, where A is the alloy having the following composition of components, wt. %: copper 40-42; 8-10 calcium; magnesium 8-9; aluminium - the rest; X=0.01-0.3 to.
The table shows the composition of the alloy and sorbtion� properties.
|Components||The composition of the alloy, wt. %|
|Activation time, h||70||64||58|
|Absorptive capacity, sup> 3N2/kg alloy||201||211||216|
|The desorption capacity, DM3N2/kg alloy||172||157||145|
To increase the sorption capacity of the alloy is carried out by introducing into the alloy in a strong hydride forming components such as calcium and magnesium.
The alloy compositions were prepared by melting the starting components, including the ligature, in an electric arc furnace with a nonconsumable tungsten electrode in an atmosphere of pre-purified argon at a residual pressure of 30 - 40 kPa.
Immediately before the activation and hydrogenation of the pieces of the alloy was crushed to pieces the size of 0.5 - 3.0 mm, and then loaded into the reactor.
Activation of the alloy consisted in holding it in an atmosphere of hydrogen filed with the rector, for the hydrogenation under a pressure of 3 MPa and a temperature of 20aboutC. the Activation period was defined by the time from the start of processing of the alloy by hydrogen to heat the reactor.
To determine the amounts of absorbed hydrogen at 20aboutWith used the method of direct absorption of hydrogen under which these quantities are determined by the equation of state of gas, depending on the change in his blood pressure�I in the system of known volume. Means of measuring pressure was exemplary manometer type MO model 1231 (accuracy class - 0,4). To determine the gas flow rate during desorption of hydrogen (50about(C) were used drum gas meter type GSB-400 (accuracy class - 1,0). This means that the pressure was measured with allowable error of less than ± 0.4%, and the gas flow rate with an error of less than ± 1,0%.
Sources of information
1. A. S. Chernikov, V. N. Fadeev, V. I. Savin. Hydride materials as a hydrogen storage //Atomic-hydrogen energy and technology. - Vol. 3. - M.: Atomizdat, 1980, 272.
2. U.S. Patent 4370163, SS 14/00, 1983. Moriwaki et al. Hydrogen storage alloy and process for making same.
3. Alloys-hydrogen accumulators. Ref. ed.: B. A. Kolachev, R. E. Shalin, A. A. Ilyin. - M.: Metallurgy, 1995. - 384 p.
Alloy based on titanium containing copper and iron, characterized in that it additionally contains aluminum, calcium and magnesium in the following ratio of components, wt. %:
|Magnesium||Of 0.03 to 0.9|
SUBSTANCE: proposed composition contains the following substances, in wt %: tungsten - 28-32, aluminium - 28-32, titanium making the rest.
EFFECT: uniform distribution of tungsten and other dopants to prevent chemical composition liquation, better strength and temperature resistance.
SUBSTANCE: titanium alloy contains, wt %: platinum metal 0.01-0.15, rare-earth metal 0.001-0.10 and Ti and impurity - the rest. The titanium alloy preferably includes Co as partial replacement of Ti amounting 0.05-1.00 wt %.
EFFECT: alloy is characterised by high corrosion resistance, good workability.
7 cl, 9 dwg, 4 tbl, 2 ex
SUBSTANCE: mixture is prepared containing maximum 65 wt % of powder produced by plasma spraying of the titanium alloy VT-22, at least 30 wt % of mixture of technical powders of titanium PTM and nickel PNK in ratio 1:1, and 3-5 wt % of received by electrolysis copper powder PMS-1 with size 50 mcm. The produced mixture is pressed at pressure 800-1000 MPa, then sintering in vacuum at temperature at least 900°C for over 1 h is performed.
EFFECT: material production on basis of titanium with high strength.
1 tbl, 1 ex
FIELD: technological processes.
SUBSTANCE: invention relates to rolling and may be used in manufacturing of armoured sheets from (α+β)-titanium alloy. The method to manufacture armoured sheets from (α+β)-titanium alloy includes preparation of charge, melting of a bar with the following composition, wt %: 3.0-6.0 Al; 2.8-4.5 V; 1.0-2.2 Fe; 0.3-0.7 Mo; 0.2-0.6 Cr; 0.12-0.3 O; 0.010-0.045 C; <0.05 N; <0.05 H;<0.15 Si; <0.8 Ni; balance - titanium. Further the bar is shaped into a slab, which is mechanically processed and rolled for semi-finished rolled products, the semi-finished rolled products are cut into stocks and rolled in stages for sheets, and then thermal treatment is carried out.
EFFECT: sheets are characterised by high strength and ballistic properties.
3 cl, 2 dwg, 3 tbl
SUBSTANCE: invention refers to metallurgy, particularly to titanium alloys with enhanced ballistic and mechanical properties. Titanium alloy includes mainly the following components, wt %: aluminium 4.2-5.4, vanadium 2.5-3.5, iron 0.5-0.7, oxygen 0.15-0.19, and the rest is titanium.
EFFECT: titanium-based alloy obtained from recycled materials shows minimum ballistic limit V50 of ca 1848 ft/sec, and high characteristics of yield strength, tensile strength and elongation.
23 cl, 6 dwg, 4 tbl, 1 ex
SUBSTANCE: invention relates to metallurgy, in particular to welded Ti based cast alloys, and intended for manufacturing of the shaped castings of valves, pumps, bodies used in shipbuilding, chemical and other industries. Ti based alloy contains in wt %: 3.0-4.5 Al, 0.02-0.14 C, 0.05-0.14 O, 0.02-0.25 Fe, 0.02-0.12 Si, 0,02-0,15 W, 0.001-0.005 B, Ti and admixtures - rest. Ratios are met: C+O2 ≤ 0.20, 2(V+Fe+Si)/Al ≤ 0.20.
EFFECT: alloy is workable, has good cast properties and set of mechanical properties ensuring operation reliability.
2 tbl, 1 ex
SUBSTANCE: invention relates to metallurgy, namely to titanium materials with high strength and processibility. Titanium material contains iron 0.60 wt % or less and oxygen 0.15 wt % or less, titanium and inevitable impurities are the rest. Material has a non-recrystallised structure formed by processing accompanied by plastic deformation and a recrystallised structure formed by annealing after the above treatment; average size of recrystallised α-grains is 1 mcm or more and 5 mcm or less, and surface area of the non-recrystallised part in a cross section of titanium material is more than 0 to 30%.
EFFECT: material is characterised by high strength and processibility.
2 dwg, 2 tbl, 45 ex
FIELD: process engineering.
SUBSTANCE: invention relates to production of long articles from titanium or its alloy or blanks of such articles. Proposed method consists in preparation of titanium or titanium alloy mix (10), melting said mix by electric arc at scull melting (20), casting of one or several ingots, primarily cylindrical in shape, in diameter smaller than 300 mm from said fused mix (30). Then, said ingots are drawn at 800-1200°C at draw bench (40) for application in, for example, aircraft engineering.
EFFECT: higher quality, simplified production.
13 cl, 3 dwg
SUBSTANCE: alloy contains the following, wt %: titanium 46.3-48.8; aluminium 0.14-2.87, calcium 0.06-1.24; magnesium 0.08-1.61; and iron is the rest.
EFFECT: reducing activation time and increasing alloy sorption capacity.
SUBSTANCE: method to produce titanium blanks involves placement of titanium sponge particles in a press chamber, compaction of the sponge particles to produce a blank, its pressing, removal of dirt from the pressed blank surface, its covering with grease and following rolling. Prior to placing the titanium sponge particles in the press chamber they are heated in a vacuum heating furnace up to the temperature of 700-800°C, alloyed by hydrogen up to the concentration of 0.1-0.9 wt %, then the temperature in the furnace is reduced to the temperature not lower than 300°C, compaction is carried out under the temperature of 300-700°C, compacted blanks are pressed by semicontinuous method via a matrix under the temperature of not more than 700°C with reduction ratio of maximum two and then under the temperature of not more than 700°C and the reduction ratio of maximum three, the blanks are rolled under the temperature of not more than 700°C, with following annealing in vacuum under the temperature of not less than 700°C.
EFFECT: possibility to process hardly deformable titanium under lower temperatures, improved mechanical properties of produced blanks.
FIELD: mechanical engineering; piston internal combustion engines.
SUBSTANCE: invention relates to valve of internal combustion engine, method of its manufacture and heat-resistant titanium alloy used for manufacture of valve consisting of following components, mass %: aluminum 7.5-12.5; molybdenum 1.6-2.6; zirconium 1.4-2.4; silicon 0.1-0.2' yttrium 0.005-0.1; titanium - the rest. It has α+α2+β phase composition with intermetallide α2 phase on Ti3Al base dispersed in α phase. Proposed method includes forming of valve from cylindrical blank by deformation machining with preliminary heating and subsequent heat treatment. Preliminary heating of part of blank related to rod done to temperature 5-20oC lower than temperature of complete polymorphic transformation of alloy, and its deformation machining is carrying out by wedge cross rolling. Deformation machining of part of blank related to head is done by forging with preliminary heating to temperature 5-50oC higher than temperature of complete polymorphic transformation of alloy corresponding to beginning of forging, and forging is finished at temperature lower than complete polymorphic transformation of alloy to form plate head of valve and transition section provided smooth changing of head into rod. Invention provides designing of valve, method of its manufacture and heat-resistant alloy used in manufacture of valve making it possible to operate valve within operating temperature range owing to increased long-term strength and creep resistant of valve head material and increased strength, modulus of elasticity and hardness of valve rod material.
EFFECT: improved quality of valve and increased reliability in operation.
16 cl, 3 tbl, 1 ex, 15 dwg
FIELD: powder metallurgy, namely sintered titanium base alloys used as constructional materials.
SUBSTANCE: sintered titanium base alloy contains, mass. %: aluminum, 5.5 - 7.0; zirconium, 1.4 -2.5; molybdenum,, 0.5 - 1.8; vanadium,, 0.8 -2.3; titanium, the balance. Alloy is prepared of powder of said content with particle size in range 0.5 - 3.0 micrometers. Structure of particles includes martensite α - phase and ω-phase with coherent dissipation range 300 - 600 Å. Percentage density of alloy - 99.6%. In structure of alloy there is no α2 - phase. Alloy is prepared by compacting under pressure 1200 Mpa, sintering at 1523 K for 3 hours in vacuum 0.0133 Mpa, annealing at 723 - 823 K for 1.5 hours and cooling together with furnace until room temperature.
EFFECT: enhanced mechanical properties of alloy.
FIELD: metallurgy, namely processes for forging titanium alloys and blank of such alloy suitable for forging.
SUBSTANCE: method comprises steps of preparing blank and forging it. Forging is realized at providing mechanical hardening factor equal to 1.2 or less and at difference of hardness values between central (along width) zone and near-surface zone equal to 60 or less by Vickers. Factor of mechanical hardening is determined as HV(def)/HV(ini), where HV(ini) - hardness of titanium alloy blank before forging; HV(def) -hardness of titanium alloy blank after forging at forging reduction 20%. Forging may be realized at deformation rate from 2 x 10 -4 s -1 to 1s-1 while keeping relations (T β - 400)°C ≤ Tm ≤ 900°C and 400°C ≤ Td ≤ 700°C, where Tβ (°C) -temperature of β-phase transition of titanium alloy, T m(°C) - temperature of worked blank; Td(°C) - temperature of die set. Blank has factor of mechanical hardening 1.2 or less and difference of hardness values between central (along width) zone and near-surface zone equal to 60 or less by Vickers.
EFFECT: possibility for forging titanium alloy blanks at minimum difference of material properties along depth, simplified finishing of blank surface after forging, reduced cracking of blank material, good workability of blank with favorable ductility and fatigue properties.
8 cl, 5 tbl, 6 dwg, 4 ex
SUBSTANCE: invention proposes titanium-base alloy and article made of thereof. Alloy comprising aluminum, molybdenum, vanadium, chrome, iron, zirconium, oxygen, carbon, hydrogen, nitrogen, copper and nickel comprises additionally silicon and tungsten in the following ratio of components, wt.-%: aluminum, 2.0-6.8; molybdenum, 1.0-3.5; vanadium, 3.0-6.0; chrome, 0.4-1.6; iron, 0.2-1.2; zirconium, 0.01-0.3; oxygen, 0.04-0.14; carbon, 0.02-0.1; hydrogen, 0.003-0.02; nitrogen, 0.005-0.05; copper, 0.001-0.1; nickel, 0.001-0.01; silicon, 0.02-0.15; tungsten, 0.001-0.03, and titanium, the balance. Invention provides the development of titanium alloys designated for making plane stringers, ribs, frames, fuselage, wings and engines and for applying as material for welding. Invention provides enhancing strength and crack-resistance of the basic alloy and welding joints and reducing article mass.
EFFECT: improved properties and quality of alloy.
3 cl, 2 tbl, 3 ex
FIELD: non-ferrous metallurgy; methods of titanium alloy bricks production.
SUBSTANCE: the invention is pertaining to the field of non-ferrous metallurgy, in particular, to the brick made out of α+β titanium alloy and to a method of its manufacture. The offered brick consists of the following components (in mass %): aluminum - 4-5, vanadium - 2.5-3.5, iron - 1.5-2.5, molybdenum - 1.5-2.5, titanium - the rest. At that the alloy out of which the brick is manufactured, contains - 10-90 volumetric % of the primary α-phase. The average grain size of the primary α-phase makes 10 microns or less in a cross-section plain parallel to the brick rolling direction. Elongation of grain of the primary α -phase is the four-fold or less. The offered method of manufacture of the given brick includes a stage of a hot rolling. At that before the stage of the hot rolling conduct a stage of the alloy heating at the surfaces temperature (Tβ-150)- Tβ°C. During realization of the stage of the hot rolling the surface temperature is kept within the range of (Tβ-300)-( Tβ -50)°C, and the final surface temperature, that is a surface temperature directly after the last rolling, makes (Tβ-300)-( Tβ-100)°C, where Tβ is a temperature of α/β-transition. The technical result of the invention is formation of a brick out of the high-strength titanium alloy having a super pliability, excellent fatigue characteristics and moldability.
EFFECT: the invention ensures production of a brick out of the high-strength titanium alloy having a super pliability, excellent fatigue characteristics and moldability.
7 cl, 7 dwg, 21 tbl, 2 ex
FIELD: nonferrous metallurgy; aircraft industry; mechanical engineering; development of alloys on the basis of titanium.
SUBSTANCE: the invention is pertaining to the field of nonferrous metallurgy, in particular, to development of alloys on the base of titanium, working at the heightened temperatures. It may be used in an aircraft industry for manufacture of components, for example, disks, vanes, rings, and also in mechanical engineering. The invention presents an alloy based on titanium and a hardware product produced out of it. The alloy contains aluminum, zirconium, stannum, niobium, a molybdenum, silicon, carbon and oxygen. At that it in addition contains tungsten and iron, at the following ratio of components (in mass %): aluminum 5.8 - 6.6, zirconium 2.0 - 4.0, stannum - 2.5 - 4.5, niobium - 0.8-2.5, molybdenum - 0.8- 1.5, silicon - 0.25-0.45, carbon - 0.05-0.1, oxygen -0.05-0.12, tungsten - 0.35-0.8, iron - 0.06-0.13, titanium - the rest. The technical result is a development of an alloy having the lower weight at the given short-time strength and a specific low-cycle fatigue, that increases an operational life and reliability of the components of the hot tract of aero-engines.
EFFECT: the invention ensures development of an alloy with the lower weight at the given short-time strength and a specific low-cycle fatigue with increased operational life and reliability.
2 cl, 2 tbl, 3 ex
FIELD: medicine; instrument-making industry; radio industry; production of materials with a memory effect of the form.
SUBSTANCE: the invention is pertaining to the materials with a memory effect of the form and with the modified surface, which may be used as implants in medicine and as the temperature sensors, thermo-sensitive and executive elements and designs in instrument-making industry, the radio industry. The offered material consists of a base made out of a titanium nickelide of the following composition (in at. %): titanium - 49-51, nickel - the rest, and the surface layer modified by alloying elements. The modified surface layer is formed by irradiation with a low-energy high-current electronic beam and has a depth of 1000-2500 nanometers and the dimensions of the crystal grains of no more than 30 nanometers. In the capacity of the alloying elements it contains oxygen and carbon at the following ratio of components (in at. %): oxygen - 10-20, carbon - 10-15, titanium - 40-50, nickel - the rest. The technical result of the invention is production of the materials with an effect of memory of the form and a high degree capability of the form restoration both at a low and high deforming loadings.
EFFECT: the invention ensures production of the materials with an effect of memory of the form and a high degree capability of the form restoration both at a low and high deforming loadings.
1 tbl, 1 ex
FIELD: metallurgy, in particular, titanium-based materials resistant to change of color.
SUBSTANCE: construction material of pure titanium contains, wt%: Fe 0.08 or less; Nb 0.02 or less; Co 0.02 or less, and is provided with surface oxide film having thickness of 170Å or less. Method involves producing material from pure titanium; etching and heating to temperature X( C) within the range of from 130 C to 280 C for time T (min) satisfying condition of T≥239408xX-2,3237.
EFFECT: increased resistance to change of color for prolonged time as compared to traditional materials.
3 cl, 2 dwg, 4 tbl, 3 ex
SUBSTANCE: invention relates to titanium-base alloys used in making high-strength and high-efficient articles. Titanium-base alloy consists of aluminum, vanadium, molybdenum, iron and oxygen. Components of alloy are taken in the following ratio, wt.-%: aluminum, 3.5-4.4; vanadium, 2.0-4.0; molybdenum, 0.1-0.8; iron, max 0.4; oxygen, max 0.25, and titanium, the balance. Invention provides the development of universal alloy for large-sized forged pieces and stamps, thin-sheet roll and foil possessing the necessary strength and plastic indices and structure.
EFFECT: improved and valuable properties of alloy.
FIELD: metallurgy; high-strength alpha-beta alloys.
SUBSTANCE: Specification gives versions of titanium-based alpha-beta alloys. The proposed alloy contains the following components: aluminum, 4.5-5.5; vanadium, 3.0-5.0; molybdenum, 0.3-1.8; iron, 0.2-0.8; oxygen, 0.12-0.25; by-elements and admixtures, lesser than 0.1 each; total amount of by-elements and admixtures is lesser than 0.5; the remainder being titanium.
EFFECT: high strength of alloy, good workability and ballistic properties.
4 cl, 5 tbl, 3 ex