| 摘要 |
PURPOSE:To obtain the carbon-contg. refractories having excellent thermal impact resistance by compounding aluminous refractory raw materials contg. aluminous fibers, silicon carbide base refractory raw materials and graphite. CONSTITUTION:The refractory raw materials for the above refractories consist of 65 to 85wt.% aluminous refractory raw materials, 5 to 15wt.% silicon carbide base refractory raw materials and 10 to 20wt.% graphite, in which 3 to 20wt.% of the aluminous refractory raw materials are the aluminous fibers. The refractories having the extremely outstanding thermal impact resistance are obtd. by adding the fibers to the carbon-contg. refractories in such a manner. The refractories having the extremely outstanding mechanical impact resistance and thermal impact resistance are obtd. by adding the aluminous fibers and metallic powder in combination with the refractories in such a case. The crack generated by the thermal stress arising from a temp. fluctuation in the carbon-contg. refractories incorporated with the aluminous fibers progresses by drawing the aluminous fibers and, therefore, the resistance to the progression of the crack is increased and the improvement in the thermal impact resistance are resulted. |
