| 摘要 |
Dense fused cast product and fused grain product of material whose microstructure consists essentially of at least 70 volume % chrome-containing corundum solid solution crystal phase, at least about 5 volume % oxidic secondary crystal phases mainly comprising chrome-containing alkaline earth hexaluminate solid solution, and less than 10 volume % metal phase. Analytical composition of material, by weight, consists essentially of at least 90% Al2O3+Cr2O3, 20-60% Cr2O3, 1-4% MO where M is Ca, Ba, Sr, Mg, Fe and mixtures thereof, 0.4-3.5% CaO, BaO, SrO and mixtures thereof, not greater than 3% MgO, not greater than 3.5% FeO, <5% SiO2, up to 0.5% fluorine, <1.5% R2O wherein R is Li, Na, K, Rb, Cs and mixtures thereof, up to 2% TiO2 and up to 3% ZrO2. Resistant to corrosion by soda-lime and borosilicate glasses. Notable electrical resistivity with SiO2 <1% by weight. |
