| 摘要 |
PROBLEM TO BE SOLVED: To obtain an excellent service life by compounding refractory aggregate contg. agalmatolite, SiC and alumina, volatile silica, metallic fibers consisting of steel and/or stainless steel and a binder. SOLUTION: The refractory aggregate contg. 12 to 60wt.% (hereafter %) agalmatolite, 3 to 40% SiC and 10 to 85% alumina selected from sintered alumina, bauxite, etc., is used. Next, 100% refractory aggregate, outer 1 to 6% volatile silica, such as silica flowers, outer 1 to 5% metallic fibers consisting of the steel fibers or stainless steel contg. about 0.5 to 5% Al and having about 0.1 to 2mm diameter and about 5 to 40mm length and the binder selected from alumina cement, silica gel, etc., are compounded. If necessary, a hardener, a dispersant, such as condensed phosphate, dry crack preventive agent, such as Al powder, and carbon selected from petroleum pitch, natural or artificial graphite, etc., are compounded at outer 10% therewith. The prepared unshaped refractories for lining of the vessel for molten iron for preventing the occurrence of crack and peeling are thus obtd. |
