초록

A refractory that is highly resistant to sequential steam oxidation and molten alkali attack is formed by reaction nitriding a mixture of silicon carbide grain, silicon metal and aluminum metal. The refractory is suitable as a blast furnace lining.

대표청구항 ▼

A bonded silicon carbide article consisting essentially of granular silicon carbide and a bond phase, said article being made by a process consisting essentially of: (a) forming a uniform mixture consisting essentially of from about 4 to about 8 percent aluminum powder, from about 10 to about 16 per

A bonded silicon carbide article consisting essentially of granular silicon carbide and a bond phase, said article being made by a process consisting essentially of: (a) forming a uniform mixture consisting essentially of from about 4 to about 8 percent aluminum powder, from about 10 to about 16 percent silicon powder and the remainder being granular silicon carbide and optionally, a temporary binder; (b) shaping the mixture into a green compact in the form of the article; (c) firing the green compact in a non-oxidative nitrogeneous atmosphere at a temperature in excess of 1300°C. until substantially all of the silicon and aluminum is combined with nitrogen to complete formation of the article; wherein the bond phase comprises from about 50 to 80 weight percent Si－Al－O－N, and contains from about 1½to about 6½weight percent oxygen based on the total weight of bond phase, and from about 6 to about 20 weight percent aluminum based on the total weight of bond phase.