| 摘要 |
PURPOSE:To improve high temp. strength or a spalling resistance by mixing a specified coarse aggregate and magnesia.carbon refractories compound containing MgO, a phenolic binder, etc., forming and heat treating. CONSTITUTION:5-15wt.% carbon, 2-10wt.% at least a kind of Al, Mg, Ca and Se or its alloy and a phenolic binder are blended to MgO, kneeded, formed, heat treated and ground to obtain a coarse aggregate (A) having 10-40mm particle size. Then, 10-30wt.% carbon, 2-7wt.% at least a kind of Al, Mg, Ca and Si or its alloy, and a phenolic binder are blended with MgO to obtain magnesia.carbon refractories compound (B). Moreover, A and B compounds are mixed at 10-40wt.% of A compound, formed, dried and hardening treated to produce a coarse aggregate blended magnesia.carbon refractories. |
