| 摘要 |
PURPOSE:To produce high alumina castable refractory to be hardly cracked, having high heat shock resistance by contg. a specified amt. of beta-alumina in high alumina refractory. CONSTITUTION:The high alumina castable refractory contains 5-70wt.% beta- alumina. As beta-alumina raw material above-mentioned, beta-alumina contg. about 92-95wt.% Al2O3 and about 4-7wt.% Na2O, can be used. As the refractory raw material other than the beta-alumina, the substance having high alumina content such as fused alumina, sintered alumina, is used. As a binder, any kind of alumina cement and hydraulic alumina are pref. The castable refractory above-mentioned is required to have >= about 90wt.% alumina content and that having alumina content smaller than about 90wt.% is undesirable, because of lowering corrosion resistance thereof. |
