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Ta-Hf-Zr-ZrB2 alloy bar and preparation method thereof

An alloy bar and raw material technology, which is applied in the field of Ta-Hf-Zr-ZrB2 alloy bar and its preparation, can solve the problem of not being able to greatly improve mechanical properties, achieve good high-temperature oxidation resistance, improve room temperature plasticity, and inhibit crystallinity. The effect of grain growth

Active Publication Date: 2021-01-29
西安鑫昌机电设备有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the high-temperature mechanical properties and fatigue strength of tantalum alloys can be improved to a certain extent by adding alloying, their mechanical properties cannot be greatly improved.

Method used

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  • Ta-Hf-Zr-ZrB2 alloy bar and preparation method thereof

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Comparison scheme
Effect test

Embodiment 1

[0024] In this embodiment Ta-Hf-Zr-ZrB 2 Alloy rods are made of raw materials with the following mass percentages: Hf 6%, Zr 6%, ZrB 2 5%, the balance is Ta and unavoidable impurities; the raw materials are all powdery raw materials, that is: Hf is Hf powder with a particle size not greater than 20 μm, Zr is Zr powder with a particle size not greater than 20 μm, ZrB 2 ZrB with a particle size not greater than 10 μm 2 Powder, Ta is Ta powder with a particle size not greater than 10 μm, of which Hf powder, Zr powder and ZrB powder 2 The mass purity of Ta powder is not less than 99.0%, and the mass purity of Ta powder is not less than 99.9%.

[0025] In this embodiment Ta-Hf-Zr-ZrB 2 The preparation method of alloy bar comprises the following steps:

[0026] Step 1, weighing each raw material according to the mass percentage, and then ball milling and mixing the weighed raw materials evenly under the protection of argon to obtain a mixed powder;

[0027] Step 2, using a hydr...

Embodiment 2

[0034] In this embodiment Ta-Hf-Zr-ZrB 2 Alloy rods are made of raw materials with the following mass percentages: Hf 6%, Zr 6%, ZrB 2 5%, the balance is Ta and unavoidable impurities; the raw materials are all powdery raw materials, that is: Hf is Hf powder with a particle size not greater than 20 μm, Zr is Zr powder with a particle size not greater than 20 μm, ZrB 2 ZrB with a particle size not greater than 10 μm 2 Powder, Ta is Ta powder with a particle size not greater than 10 μm, of which Hf powder, Zr powder and ZrB powder 2 The mass purity of Ta powder is not less than 99.0%, and the mass purity of Ta powder is not less than 99.9%.

[0035] In this embodiment Ta-Hf-Zr-ZrB 2 The preparation method of alloy bar comprises the following steps:

[0036] Step 1, weighing each raw material according to the mass percentage, and then ball milling and mixing the weighed raw materials evenly under the protection of argon to obtain a mixed powder;

[0037] Step 2, using a hydr...

Embodiment 3

[0043] In this embodiment Ta-Hf-Zr-ZrB 2 Alloy rods are made of raw materials with the following mass percentages: Hf 6%, Zr 6%, ZrB 2 5%, the balance is Ta and unavoidable impurities; the raw materials are all powdery raw materials, that is: Hf is Hf powder with a particle size not greater than 20 μm, Zr is Zr powder with a particle size not greater than 20 μm, ZrB 2 ZrB with a particle size not greater than 10 μm 2 Powder, Ta is Ta powder with a particle size not greater than 10 μm, of which Hf powder, Zr powder and ZrB powder 2 The mass purity of Ta powder is not less than 99.0%, and the mass purity of Ta powder is not less than 99.9%.

[0044] In this embodiment Ta-Hf-Zr-ZrB 2 The preparation method of alloy bar comprises the following steps:

[0045] Step 1, weighing each raw material according to the mass percentage, and then ball milling and mixing the weighed raw materials evenly under the protection of argon to obtain a mixed powder;

[0046] Step 2, using a hydr...

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Abstract

The invention provides a Ta-Hf-Zr-ZrB2 alloy bar. The Ta-Hf-Zr-ZrB2 alloy bar is prepared from the following raw materials in percentage by mass: 3-9% of Hf, 4-8% of Zr, 3-7% of ZrB2, and the balanceTa and inevitable impurities. The invention further provides a method for preparing the alloy bar. The method comprises the following steps that: (1) all the raw materials are weighed according to themass percentages, and are ball-milled and uniformly mixed under argon protection to obtain mixed powder; (2) the mixed powder is pressed to obtain a blank; (3) the blank is put in a shell; and the shell is sealed after vacuumizing; (4) the hot isostatic pressing sintering is performed to obtain a Ta-Hf-Zr-ZrB2 alloy sintered body; and (5) the hot extrusion is performed to obtain the Ta-Hf-Zr-ZrB2alloy bar. The alloy bar is excellent in high-temperature oxidation resistance, room-temperature plasticity and tensile strength and excellent in fatigue strength, high-temperature strength and superplasticity, and can be applied to high-temperature structural parts.

Description

technical field [0001] The invention belongs to the technical field of alloy rods, in particular to a Ta-Hf-Zr-ZrB 2 Alloy bar and method for its preparation. Background technique [0002] Tantalum alloys have been extensively studied as candidate materials for aerospace, nuclear engineering and aircraft engines since the 1950s. Although tantalum alloys are attractive in terms of room temperature plasticity, formability, corrosion resistance, and melting point, their poor fatigue strength has become a major obstacle for their application as high-temperature structural materials. At the same time, when the service temperature exceeds 1100°C, the creep resistance of tantalum alloys decreases significantly. Adding W, Hf, Zr and other 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 structural materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C27/02C22C32/00C22C1/05B22F3/15B22F3/20
CPCC22C27/02C22C32/0073C22C1/05B22F3/15B22F3/20B22F2003/208
Inventor 倪明田小军
Owner 西安鑫昌机电设备有限责任公司
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