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nature : with a high hardness, brittleness, and the heat of formation, low vapor pressure, evaporation rate, excellent chemical resistance to corrosive and special electromagnetic and temperature above 1500 ° C compounds. Most of them can be divided into two categories : (1) refractory metal compounds, metals and non-metallic compounds of elements, such as tungsten, molybdenum, tantalum, niobium, vanadium, chromium, titanium, zirconium and other refractory metals and scandium, cerium, lanthanum, yttrium and other rare earth boride, carbide and nitride , silicide, phosphorous and sulfide; (2) refractory non-metallic compounds, namely non-metallic compounds of elements, such as boron carbide, silicon carbide, boron nitride, silicon nitride, boron phosphate, boron and silicon phosphating silicon alloy. Refractory compounds have a very important purposes : (1) high temperature refractory materials, such as the crucible, mold, nozzle, high temperature thermocouple casing; (2) chemical corrosion-resistant materials, such as transportation acid and alkali solution of structural components, mixers, filters, etc.; (3) Heat materials such as rocket components of the structure, nuclear engineering, materials, heating element; (4) rigid materials such as hard metal cutting tools, abrasive, bit; (5) electrical materials, such as high temperature thermocouple, Ignition () very, automatic control elements.
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