Nanostructure tungsten alloy and preparation method thereof

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...

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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 high temperature of the product is improved. strength, but the toughness of the product has not been improved compared with metal tungsten; secondly, the preparation method cannot obtain a product with improved high temperature strength and toughness.

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