ungsten alloy

Tungsten-based alloy of tungsten is added to the other elements of the alloy. In metals, the highest melting point of tungsten, high temperature strength and creep resistance and thermal conductivity, electrical conductivity and electron emission properties are better than the material, in addition to a large number of alloys for the manufacture of additives for carbide and tungsten and its alloys are widely used electronics, electric light industry, but also aerospace, casting, weaponry and other sectors for the production of rocket nozzles, die casting mold, penetrator, contacts, heating elements and insulation screens.The earliest for the production of incandescent tungsten filament. 1909 U.S. Kuli Ji (WDCoolidge) using tungsten powder pressing, remelting, swaging, made of tungsten wire drawing process, from tungsten wire production has been growing rapidly. 1913 Langmuir (I.Langmuir) and Rogers (W.Rogers) found thorium tungsten wire (also known as thorium tungsten filament) electron emission performance than pure tungsten, start using thorium tungsten wire, is still widely used. 1922 developed with excellent anti-sagging properties of tungsten wire (called doping does not sag tungsten or tungsten), which is the study of tungsten significant progress. Does not sag tungsten filament is excellent and widely used cathode material. 50 to 60 years, for tungsten alloy conducted extensive exploration and research, hopes to develop in 1930 ~ 2760 ℃ working tungsten alloy, used for making high-temperature aerospace industry components. Tungsten-rhenium alloy which more research. Tungsten smelting and processing forming technology also carried out research, using consumable arc and electron beam melting tungsten ingot obtained and processed by extrusion and plastic products made from certain; but smelt ingots coarse grains, poor plasticity , processing difficulties, finished product rate, thereby melting - plastic processing technology does not become the main means of production. In addition to chemical vapor deposition (CVD method), and plasma spraying can produce very few products, made of tungsten powder metallurgy products are still the primary means.