1. Tungsten (W) is the metal with the highest melting point, its melting point is up to 3380 ℃, and its boiling point is 5927 ℃. At 2000 ℃ - 2500 ℃, the vapor pressure is still very low. Tungsten has high hardness, high density and high temperature strength.
2. Tungsten was first used to make incandescent filaments, while tungsten was mostly used to produce ferrotungsten carbide. The heat-resistant alloy composed of tungsten, chromium, molybdenum and cobalt is used to make tools, metal surface hardening materials, gas turbine blades and combustion tubes. Tungsten and tantalum, niobium, molybdenum and other refractory alloys. Tungsten copper and tungsten silver alloys are used as electrolytic contact materials. High density tungsten nickel alloy is used as a radiation protection screen. The wires, rods and pieces of tungsten metal are used to make parts of electric light bulbs and electronic tubes and electrodes for arc welding. Tungsten powder shall be able to be sintered into filters with various porosity. Some compounds of tungsten can be used as fluorescent agents, pigments, dyes, tanning and fireproof fabrics.
3. Modern super hard alloys are produced by sintering of tungsten carbide and carbides of some other elements. It is made by mixing hard particles of carbide of refractory metals (tungsten, tantalum, titanium, molybdenum, etc.) with powder of one or several iron group elements (cobalt, nickel or iron), pressing and forming, and then sintering.