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Description:Tungsten has the highest melting point and the best high temperature strength of the four common refractory metals. Tungsten has been used for many years in the lamp industry for filaments. It has gained wide acceptance as an essential material in electrical contacts, glass-to-metal seals, support and electrodes. The demand for tungsten is increasing because the growing technology in electronics, nucleonics, and aerospace demands increased materials performance and reliability at higher and higher temperatures.
Fabricability of tungsten is no longer the critical problem that it was a few years ago. Engineered reproducible tungsten products coupled with newly developed tools and techniques have minimized or eliminated fabrication problems.
Application
Tungsten is used because of its: exceptional strength and stiffness at high temperatures, good thermal conductivity, low thermal expansion and emissivity in many electronic applications; strength, stiffness, thermal expansion, low vapor pressure, electrical resistivity, emissivity, ductility, and fabricability in high temperature furnace applications; strength, erosion resistance, corrosion resistance, resistance to thermal shock, and fabricability for nozzle and other hardware in aerospace application; resistance to thermal shock and erosion in die casting applications.
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