RAW MATERIAL FOR SINTERED BLACK MULLITE, SINTERED BLACK MULLITE AND ITS PRODUCTION

摘要

PURPOSE:To provide a sintered black mullite having remarkably improved problems of swell (blister), color shade (stain) and foreign matters. CONSTITUTION:The objective raw material for sintered black mullite contains 100 pts.wt. of mullite powder and 2-8 pts.wt. of a black-coloring agent consisting of 20-30wt.% of iron oxide, 15-33wt.% of cobalt oxide, 10-30wt.% of manganese oxide and 15-40wt.% of chromium oxide.