Nanostructure tungsten alloy and preparation method thereof

A nanostructure and tungsten alloy technology, which is applied in the field of nanostructure tungsten alloy and its preparation, can solve the problems of improving toughness, inability to obtain high temperature strength and toughness, etc., and achieve the effect of improving strength, small size, and easy large-scale industrial production

Active Publication Date: 2014-04-23
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

However, there are deficiencies in both the product and its preparation method. First, although the yttrium oxide particles distributed at the grain boundaries of metal tungsten play a role in dispersion strengthening and refining tungsten grains, the

Method used

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  • Nanostructure tungsten alloy and preparation method thereof
  • Nanostructure tungsten alloy and preparation method thereof
  • Nanostructure tungsten alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The concrete steps of preparation are:

[0035] Step 1, first prepare ammonium paratungstate, rare earth metal nitrate, citric acid and deionized water into a transparent mixed solution, and then place it at 50°C to stir and react to obtain a gel; wherein, the ammonium paratungstate, rare earth metal nitrate in the mixed solution The molar ratio with citric acid is 1:0.08:24, and the rare earth metal nitrate is yttrium nitrate. Then the gel is heated and dried and then calcined at 400°C for 3 hours; wherein, the temperature of the gel is heated and dried at 100°C for 20 hours to obtain a mixed powder of tungsten oxide and rare earth metal oxide.

[0036]Step 2, first place the mixed powder of tungsten oxide and rare earth metal oxide in a hydrogen atmosphere, and conduct a reduction reaction at a temperature of 500° C. for 3 hours to obtain a mixed powder of nanometer-sized metal tungsten and rare earth metal oxide. Then mix nano-sized metal tungsten and rare earth met...

Embodiment 2

[0042] The concrete steps of preparation are:

[0043] Step 1, first prepare ammonium paratungstate, rare earth metal nitrate, citric acid and deionized water into a transparent mixed solution, then place it at 61°C to stir and react to obtain a gel; wherein, the ammonium paratungstate, rare earth metal nitrate in the mixed solution The molar ratio with citric acid is 1:0.12:18, and the rare earth metal nitrate is yttrium nitrate. Then heat and dry the gel and place it at 500° C. for 2.5 hours for calcination; wherein, the temperature of the gel is heated and dried at 138° C. for 15 hours to obtain a mixed powder of tungsten oxide and rare earth metal oxide.

[0044] Step 2, first place the mixed powder of tungsten oxide and rare earth metal oxide in a hydrogen atmosphere, and conduct a reduction reaction at a temperature of 600° C. for 2.5 hours to obtain a mixed powder of nanometer-sized metal tungsten and rare earth metal oxide. Then mix nano-sized metal tungsten and rare ...

Embodiment 3

[0050] The concrete steps of preparation are:

[0051] Step 1, first prepare ammonium paratungstate, rare earth metal nitrate, citric acid and deionized water into a transparent mixed solution, then place it at 73°C to stir and react to obtain a gel; among them, the ammonium paratungstate, rare earth metal nitrate in the mixed solution The molar ratio with citric acid is 1:0.04:13, and the rare earth metal nitrate is yttrium nitrate. Then heat and dry the gel and place it at 600° C. for 2 hours for calcination; wherein, the temperature of the gel is heated and dried at 175° C. for 10 hours to obtain a mixed powder of tungsten oxide and rare earth metal oxide.

[0052] Step 2, first place the mixed powder of tungsten oxide and rare earth metal oxide in a hydrogen atmosphere, and conduct a reduction reaction at a temperature of 700° C. for 2 hours to obtain a mixed powder of nanometer-sized metal tungsten and rare earth metal oxide. Then, the mixed powder of nano-sized metal tu...

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Abstract

The invention discloses nanostructure tungsten alloy and a preparation method thereof. The alloy mainly comprises tungsten, and also comprises 0.05 to 1.0wt percent of zirconium and 0.2 to 2.0wt percent of rare-earth metal oxide particles, wherein the rare-earth metal oxide particle adopts yttrium oxide particles, lanthanum oxide particles or cerium oxide particles distributed in tungsten crystal particle. The method comprises the steps of firstly preparing ammonium paratungstate, rare-earth metal nitrate, citric acid and deionized water into transparent mixed liquor, stirring the transparent mixed liquor, obtaining gel after reaction, heating and drying the gel, then calcining the gel, so as to obtain a mixed powder of tungsten oxide and rare-earth metal oxide, putting the mixed powder into hydrogen atmosphere, so as to obtaining a mixed powder of tungsten and rare-earth metal oxide after reduction reaction, mixing the mixed powder with zirconium and zirconium hydride powder, so as to obtain a mixed powder of tungsten, zirconium, or zirconium hydride, and rare-earth metal oxide, and finally performing compaction and sintering to the mixed powder, so as to obtain the nanostructure tungsten alloy. The nanostructure tungsten alloy can be applied to fields of lighting, high-temperature components, aerospace devices, high temperature resistance containers and the like.

Description

technical field [0001] The invention relates to a tungsten alloy and a preparation method thereof, in particular to a nanostructured tungsten alloy and a preparation method thereof. Background technique [0002] Metal tungsten, which has the advantages of high melting point, high sputtering threshold, low thermal expansion coefficient, low vapor pressure, and good corrosion resistance, can be widely used in high-temperature components, electron tubes, X-ray targets, lighting, etc. Candidate wall materials for fusion reactors. However, in addition to the disadvantages of low-temperature brittleness and recrystallization brittleness, metal tungsten also has the disadvantages of grain growth at high temperatures and resulting in recrystallization brittleness, low high-temperature strength, and due to the high hardness and high toughness of tungsten. Brittle transition temperature makes it difficult to process defects. Recently, people have made some attempts and efforts to im...

Claims

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Application Information

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IPC IPC(8): C22C27/04C22C32/00C22C1/05
Inventor 刘瑞谢卓明方前锋王先平
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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