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Tungsten and tantalum carbide alloy and preparation method thereof

A tantalum carbide and alloy technology, applied in the field of tungsten-tantalum carbide alloy and its preparation, can solve the problems of low room temperature strength, difficult processing of tungsten alloy, no obvious improvement in plasticity, etc., and achieves simple preparation method and high recrystallization temperature. , the effect of low cost

Inactive Publication Date: 2015-07-01
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It plays the role of dispersion strengthening and refining tungsten grains by distributing yttrium oxide at the grain boundary of metal tungsten. Although it can improve the high temperature strength of the alloy, it makes the room temperature strength of the alloy lower than that of pure tungsten. , the plasticity has not been significantly improved, and the problem of difficult processing of tungsten alloys has not been solved from the root.

Method used

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  • Tungsten and tantalum carbide alloy and preparation method thereof
  • Tungsten and tantalum carbide alloy and preparation method thereof
  • Tungsten and tantalum carbide alloy and preparation method thereof

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Effect test

Embodiment 1

[0025] The concrete steps of preparation are:

[0026] Step 1, according to the ratio of 99.8wt% by weight: 0.2wt%, put metal tungsten powder and tantalum carbide powder in a protective atmosphere (or vacuum or alcohol) and mix evenly; wherein, the particles of metal tungsten powder The diameter is 0.6μm, the particle size of tantalum carbide powder is 10-100nm, and the protective atmosphere is hydrogen atmosphere (or the vacuum degree of vacuum is ≤100Pa), and the mixed powder is obtained.

[0027] Step 2, first press the mixed powder under a pressure of 200MPa to form a green body, then place the green body in a hydrogen atmosphere (or a vacuum with a vacuum degree of ≤100Pa), and sinter and shape it at 1500°C;

[0028] Alternatively, place the mixed powder in a hydrogen atmosphere (or a vacuum with a vacuum degree of ≤100Pa), and sinter it by hot isostatic pressing at a pressure of 100MPa and a temperature of 1500°C;

[0029] Alternatively, place the mixed powder in a hydr...

Embodiment 2

[0033] The concrete steps of preparation are:

[0034] Step 1, according to the ratio of 99.5wt% by weight: 0.5wt%, put metal tungsten powder and tantalum carbide powder in a protective atmosphere (or vacuum or alcohol) and mix evenly; wherein, the particles of metal tungsten powder The diameter is 0.6μm, the particle size of tantalum carbide powder is 10-100nm, and the protective atmosphere is hydrogen atmosphere (or the vacuum degree of vacuum is ≤100Pa), and the mixed powder is obtained.

[0035] Step 2, first press the mixed powder under a pressure of 300MPa to form a green body, then place the green body in a hydrogen atmosphere (or a vacuum with a vacuum degree of ≤100Pa), and sinter and shape it at 1675°C;

[0036] Alternatively, place the mixed powder in a hydrogen atmosphere (or a vacuum with a vacuum degree of ≤100Pa), and sinter it by hot isostatic pressing at a pressure of 130MPa and a temperature of 1625°C;

[0037] Alternatively, place the mixed powder in a hydr...

Embodiment 3

[0040] The concrete steps of preparation are:

[0041]Step 1, according to the ratio of 99.2wt% by weight: 0.8wt%, put the metal tungsten powder and tantalum carbide powder in a protective atmosphere (or vacuum or alcohol) and mix evenly; wherein, the particles of the metal tungsten powder The diameter is 0.6μm, the particle size of tantalum carbide powder is 10-100nm, and the protective atmosphere is hydrogen atmosphere (or the vacuum degree of vacuum is ≤100Pa), and the mixed powder is obtained.

[0042] Step 2, first press the mixed powder under a pressure of 400MPa to form a green body, then place the green body in a hydrogen atmosphere (or a vacuum with a vacuum degree of ≤100Pa), and sinter and shape it at 1850°C;

[0043] Alternatively, place the mixed powder in a hydrogen atmosphere (or a vacuum with a vacuum degree of ≤100Pa), and sinter it by hot isostatic pressing at a pressure of 150MPa and a temperature of 1750°C;

[0044] Alternatively, place the mixed powder in...

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Abstract

The invention discloses a tungsten and tantalum carbide alloy and a preparation method thereof. The alloy mainly comprises metallic tungsten and contains 0.2 to 0.8 percent by weight of tantalum carbide. The preparation method comprises the following steps of feeding a metallic tungsten powder body and a tantalum carbide powder body according to a proportion in a protective atmosphere or vacuum or alcohol and uniformly mixing to obtain a mixed powder body; firstly, feeding the mixed powder body to be under pressure of 200 to 600MPa and pressing to form a green body; secondly, feeding the green body in the protective atmosphere or vacuum and sintering and forming the green body at the temperature of 1,500 to 2,200DEG C to obtain a target product. The tungsten and tantalum carbide alloy prepared by the preparation method disclosed by the invention has the advantages of good room temperature strength and plasticity and excellent properties of higher high-temperature strength and plasticity as well as high recrystallization temperature.

Description

technical field [0001] The invention relates to an alloy and a preparation method thereof, in particular to a tungsten-tantalum carbide alloy and a preparation method thereof. Background technique [0002] Metal tungsten is a rare metal with a high melting point. Its chemical properties are very stable. It does not react with air and water at room temperature, and is insoluble in hydrochloric acid, sulfuric acid, nitric acid and alkali solutions. However, the recrystallization temperature of pure tungsten is low, and it is prone to grain growth at high temperature, which leads to recrystallization embrittlement, and the high temperature strength is low; in addition, due to the high hardness and high ductile-brittle transition temperature of tungsten, it is difficult to Processing and forming. Recently, people have made some attempts and efforts to improve the properties of metal tungsten. An oxide dispersion-strengthened tungsten alloy is disclosed in an article in Volume ...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C27/04
Inventor 苗澍谢卓明张涛王先平方前锋刘长松
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI