zirconium boride

zirconium boride

[‚zər′kō·nē·əm ′bȯr‚īd]
(inorganic chemistry)
ZrB2 A hard, toxic, gray powder that melts at 3000°C; used as an aerospace refractory, in cutting tools, and to protect thermocouple tubes. Also known as zirconium diboride.
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2] 7 820 Quartz (silicone dioxide-silica) Similar to tool steels -- 935 Chromium -- 1,160 Zirconia -- 1,250 Beryllia 8 1,340 Topaz (hydrous aluminum fluorosilicate) -- 1,360 Garnet -- 1,400- Tungsten carbide alloy 1,800 -- 1,550 Zirconium boride 9 -- Corundum Ruby or sapphire (aluminum fluorosilicate) aluminum oxides 9 1,800 Titanium nitride -- 1,880 Tungsten carbide -- 2,000 Tantalum carbide -- 2,100 Zirconium carbide -- 2,100 Alumina -- 2,410 Beryllium carbide -- 2,470 Titanium carbide -- 2,480 Silicone carbide -- 2,500 Aluminum boride -- 2,750 Boron carbide 10 7,000 Diamond (carbon) Table 4--hardness of fillers mixed in batch mixers (ref.