Ta-W-Al-Al2O3 alloy rod and preparation method thereof

An alloy bar, al2o31%-4% technology, applied in the field of Ta-W-Al-Al2O3 alloy bar and its preparation, can solve the problems of restricting the application of tantalum-tungsten alloys, the decrease of high-temperature strength of tantalum-tungsten alloys, and limited prospects. Achieve excellent high temperature tensile strength and oxidation resistance, good room temperature plasticity and tensile strength

Inactive Publication Date: 2019-01-18
XIAN HUASHAN METAL PROD CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, when the service temperature exceeds 1200°C, the high-temperature strength of tantalum-tungsten alloys decreases significantly. Adding alloying elements to tantalum can form a tantalum alloy with high alloy concentration, which has significantly improved high-temperature mechanical properties and good processing performance, so it is used as a high-temperature alloy. Structural materials, although the high-temperature mechanical properties of tantalum alloys can be improved to a certain extent through alloying modification, but the prospect of greatly improving its mechanical properties and making it applicable in ultra-high temperature and harsh environments is limited
At the same time, the preparation method of tantalum-tungsten alloy is generally electron bombardment smelting method, and the tantalum alloy ingot grain obtained by electron bombardment smelting method is coarse, reaching an average of 3-5mm, which is not good for the mechanical properties of the material.
In addition, tantalum-tungsten alloys are easily oxidized by oxygen absorption when exposed to air above 300°C, which also limits the application of tantalum-tungsten alloys.

Method used

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  • Ta-W-Al-Al2O3 alloy rod and preparation method thereof

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preparation example Construction

[0022] A kind of Ta-W-Al-Al 2 o 3 The preparation method of alloy bar, its preparation steps are:

[0023] (1) W, Al, Al 2 o 3 and Ta are placed in a ball mill, and ball milled and mixed evenly under the protection of an argon atmosphere to obtain a mixed powder;

[0024] (2) Compressing the mixed powder to obtain a billet;

[0025] (3) Put the blank into the shell, vacuumize the shell, and seal the shell after the air in the shell is evacuated;

[0026] (4) Place the billet sealed in the shell in a hot isostatic pressing furnace, heat isostatic pressing and sintering at a temperature of 1500°C-1700°C and a pressure of 160MPa-200MPa for 1h-3h, and remove it after natural cooling Shell, get Ta-W-Al-Al 2 o 3 Alloy sintered body;

[0027] (5) the Ta-W-Al-Al 2 o 3 The alloy sintered body is extruded at an extrusion temperature of 1400°C-1600°C and an extrusion ratio of 6-10, and then peeled off after natural cooling to obtain Ta-W-Al-Al 2 o 3 Alloy bars.

[0028] It i...

Embodiment 1

[0033] Embodiment 1: a kind of Ta-W-Al-Al 2 o 3 Alloy rods, made of the following raw materials in mass percentages: W 10%, Al 4%, Al 2 o 3 2.5%, the balance is Ta, wherein said W, Al, Al 2 o 3 , Ta are powder raw materials, W powder and Al powder particle size is not greater than 30μm, Al 2 o 3 The particle size of the powder is not greater than 10 μm, and the particle size of Ta powder is not greater than 50 μm; the W powder, Al powder and Al powder 2 o 3 The mass purity of the powder is not less than 99.9%, and the mass purity of Ta powder is not less than 99.5%.

[0034] The Ta-W-Al-Al 2 o 3 The preparation steps of the alloy bar are:

[0035] (1) Place tantalum powder, tungsten powder, aluminum powder and aluminum oxide powder in a ball mill, and ball mill and mix them uniformly under the protection of an argon atmosphere to obtain a mixed powder, wherein the ball mill speed of the ball mill is 300r / min, the The time of ball milling is 8h;

[0036] (2) Compres...

Embodiment 2

[0042] Embodiment 2: a kind of Ta-W-Al-Al 2 o 3 Alloy rods, made of raw materials with the following mass percentages: W 5%, Al2%, Al 2 o 3 1%, the balance is Ta, wherein said W, Al, Al 2 o 3 , Ta are all powder raw materials, the particle size of W powder and Al powder is not more than 30μm, Al 2 o 3 The particle size of the powder is not greater than 10 μm, and the particle size of Ta powder is not greater than 50 μm; the W powder, Al powder and Al powder 2 o 3 The mass purity of the powder is not less than 99.9%, and the mass purity of Ta powder is not less than 99.5%.

[0043] The Ta-W-Al-Al 2 o 3 The preparation steps of the alloy bar are:

[0044] (1) Place tantalum powder, tungsten powder, aluminum powder and aluminum oxide powder in a ball mill, and ball mill and mix them uniformly under the protection of an argon atmosphere to obtain a mixed powder, wherein the ball milling speed of the ball mill is 200r / min, said The time of ball milling is 6h;

[0045] (...

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Abstract

The invention discloses a Ta-W-Al-Al2O3 alloy rod and a preparation method thereof, and relates to the technical field of alloy rods. The alloy rod is prepared from the following raw materials by masspercent: 5%-15% of W, 2%-6% of Al, 1%-4% of Al2O3, and the balance of Ta. The preparation method is characterized in that place tantalum powder, tungsten powder, aluminum powder and aluminium oxide powder in a ball mill, and perform ball mill mixing under the protection of an argon atmosphere to obtain a mixed powder; press to obtain a billet; place the billet in an enclosure, and seal the enclosure after vacuuming; perform high temperature isostatic pressing to obtain a sintered body of Ta-W-Al-Al2O3 alloy; perform thermal extrusion to obtain a Ta-W-Al-Al2O3 alloy rod. The alloy rod preparedby the invention has good room temperature plasticity and tensile strength, as well as excellent high temperature strength and oxidation resistance, and can be used in an air environment of 1,500 DEGC.

Description

technical field [0001] The present invention relates to the technical field of alloy rods, in particular to a Ta-W-Al-Al 2 o 3 Alloy bar and its preparation method. Background technique [0002] Tantalum alloy has the advantages of high density, high temperature resistance, high strength, good processing performance, fracture toughness, corrosion resistance, etc. It is an indispensable and important material in the fields of aviation, aerospace, chemical industry, nuclear industry, high temperature technology, etc. Application prospects. Tantalum-tungsten alloys are mostly used in ultra-high temperature structural parts in extreme environments such as ultra-high temperature, ultra-high pressure, high-speed airflow erosion, rapid cooling and rapid heating, such as high-temperature structural materials for rocket engines, heat-resistant skins for hypersonic re-entry vehicles , Thermal protection of space shuttles, nuclear fuel cladding materials, anti-ablation rudders, supe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/10B22F3/10B22F3/15B22F3/20C22C1/05C22C27/02
CPCB22F3/10B22F3/15B22F3/20C22C1/05C22C27/02
Inventor 常喜周刚王占锋张力力卢成成梁宏裕
Owner XIAN HUASHAN METAL PROD CO LTD
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