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Tungsten-zirconium carbide-rhenium alloy with high-temperature stability and preparation method thereof

A zirconium carbide and rhenium alloy technology, which is applied in the field of tungsten-zirconium carbide-rhenium alloy and its preparation, can solve the problems of no obvious increase in recrystallization temperature and low elongation, and achieve high recrystallization temperature and low ductile-brittle transition temperature , the effect of high temperature strength and plasticity

Inactive Publication Date: 2015-09-02
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It plays the role of dispersion strengthening and grain refinement by distributing zirconium carbide at the grain boundary of tungsten. Although it can improve the high temperature strength of the alloy, its recrystallization temperature (1200°C) is lower than that of pure tungsten. The crystallization temperature (1100°C) is not significantly increased, and its ductile-brittle transition temperature (600°C) is not significantly lower than that of pure tungsten (700°C), and its elongation is also low (<10%)

Method used

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  • Tungsten-zirconium carbide-rhenium alloy with high-temperature stability and preparation method thereof
  • Tungsten-zirconium carbide-rhenium alloy with high-temperature stability and preparation method thereof
  • Tungsten-zirconium carbide-rhenium alloy with high-temperature stability and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0025] The concrete steps of preparation are:

[0026] Step 1. Put metal tungsten powder, zirconium carbide powder and rhenium powder in a protective atmosphere (or vacuum or Alcohol) mixed evenly; Among them, the particle size of metal tungsten powder is 0.6μm, the particle size of zirconium carbide powder is 10-50nm, the particle size of rhenium powder is 1-2um, 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 h...

Embodiment 2

[0033] The concrete steps of preparation are:

[0034] Step 1. Put metal tungsten powder, zirconium carbide powder and rhenium powder in a protective atmosphere (or vacuum or Alcohol) mixed evenly; Among them, the particle size of metal tungsten powder is 0.6μm, the particle size of zirconium carbide powder is 10-50nm, the particle size of rhenium powder is 1-2um, 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 h...

Embodiment 3

[0041]The concrete steps of preparation are:

[0042] Step 1. Put metal tungsten powder, zirconium carbide powder and rhenium powder in a protective atmosphere (or vacuum or Alcohol) mixed evenly; Among them, the particle size of metal tungsten powder is 0.6μm, the particle size of zirconium carbide powder is 10-50nm, the particle size of rhenium powder is 1-2um, and the protective atmosphere is hydrogen (or vacuum The vacuum degree is ≤100Pa), and the mixed powder is obtained.

[0043] 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 at 1850°C;

[0044] 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;

[0045] Alternatively, place the mixed powder in a hydrogen atmosphere (or a vac...

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Abstract

The invention discloses a tungsten-zirconium carbide-rhenium alloy and a preparation method thereof. The alloy mainly comprises metal tungsten, wherein the alloy also includes 0.2wt percent to 1.0wt percent of zirconium carbide, and 0.5wt percent to 3.0wt percent of rhenium. The preparation method comprises the following steps of putting metal tungsten powder, zirconium carbide powder and rhenium powder in a protective atmosphere or a vacuum or alcohol in proportion to be mixed uniformly for obtaining mixed powder, first putting the mixed powder under pressure of 200MPa to 600MPa to press for obtaining a green compact, afterwards, putting the green compact in the protective atmosphere or the vacuum, and sintering and molding the green compact at a temperature of 1500 DEG C to 2200 DEG C to prepare a target product. The tungsten-zirconium carbide-rhenium alloy prepared by the invention has excellent performances of higher high-temperature strength and plasticity and a high recrystallization temperature.

Description

technical field [0001] The invention relates to an alloy and a preparation method thereof, in particular to a tungsten-zirconium carbide-rhenium alloy and a preparation method thereof. Background technique [0002] Metal tungsten is a rare metal with a high melting point. Its chemical properties are stable, it does not react with air and water at room temperature, and it is insoluble in hydrochloric acid, sulfuric acid, nitric acid and alkaline solutions. However, the recrystallization temperature of tungsten is low, recrystallization embrittlement is easy at high temperature, and the high temperature strength is low; in addition, due to the high ductile-brittle transition temperature of tungsten, it is difficult to process tungsten. Recently, people have made some attempts and efforts to improve the performance of metal tungsten. The article in Volume 51 of "Int. Journal of Refractory Metals and Hard Materials" in 2015 disclosed a tungsten alloy strengthened by the second p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C27/04C22C1/05
Inventor 杨晓东谢卓明张涛王先平方前锋刘长松苗澍
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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