Quality of Al2O3 of alumina, structural formula, opposite element 101. 9, melting point 2050 ℃ , hardness 9, true density is 3.99 ~ 4. The normal temperature of alumina of 0lg/ Cm3 agglomeration is fought fold intensity to be 250MPa, there still is 156MPa in 1000 ℃ , intensity of normal temperature compression is 2000MPa above, microcrystalline alumina (corundum) in 5000MPa. Loading bate temperature (loading 0.2MPa) 1850T, tall limit uses temperature to be able to amount to 1950^ . Coefficient of expansion of oxidation aluminum steel (℃ of 20 ~ 1000) it is on average 8. 6 X 10-6 is 16.55mm/m in the crucial linear expansion when ℃ of 20 ~ 1800. The thermal conductance of 1500 ℃ is 5.8w/(m · K) . The resistor rate of 100 ℃ is 2 × 1015, the resistor rate of 1500 ℃ is 3 X102. Cm.
Alumina belongs to neuter (bisexual) oxide material, have to material of acerbity, alkaline, salt fight aggressivity very well. Chemical stability is very tall, comfortable use at be below atmosphere of oxidation, reductive, protection and vacuum condition.
The breed of fireproof material has alumina particular kind: Advanced and refractory products, ceramic, small qualitative adiabatic products, fiber and indeterminate form product, its basically apply limits to have:
(Furnace of 1) superhigh temperature kiln uses; of lining construction material
(The crucible; that the smelt such as alloy of tall pure metal, high temperature, rare precious metal, extract uses 2)
(The; such as lukewarm insulation of pipe of heat of heat of 3) high temperature, thermocouple canal, Zuo
(The kiln with high temperature resistant 4) is provided, spacer, pressure club and pressure piece wait for;
(5) is petro-chemical industrial high temperature resistant, fight corrode lining material;
(Pottery and porcelain of 6) transparent alumina can do; of glass of viewport of cover of high-pressured natrium tube, microwave, high temperature
(7) makes electric bed in electronic industry piece, the; such as cover of antennae of envelope of pottery and porcelain of electronic socket, high pressure, radar, sparkplug
(8) is ground provide and abrasive, be like emery wheel piece, cut piece, porcelain of the model that pull silk, cone pulliy that pull silk, spin, bearing of wear-resisting of gush arenaceous mouth, high temperature and the; such as all sorts of cutting tool
(9) chemical industry is industrial component of force plunger pump, the; such as seal ring
(Fluid of frit of metal of industry of 10) metallurgy, coloured carries pipeline;
(Effect of the high temperature of department of 11) each industry, Zuo , energy-saving material, if alumina is hollow fiber of beard of ball, alumina brilliant, alumina reach its goods.
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