| 摘要 |
PURPOSE:To obtain a porous plug having corrosion resistance as well as desired gas permeability and a uniform structure by heat treating spherical granules consisting of alumina and zircon, and using the resulting spherical alumina-zircon granules as aggregate. CONSTITUTION:A finely powdered mixture consisting of 80-95wt% alumina and 5-20wt% zircon is granulated by rolling with sodium polyalkylallylsulfonate or the like. The resulting spherical granules are heat treated at 1,600-1,900 deg.C in a gas oven or the like to form spherical alumina-zircon aggregate. The aggregate granules are blended with phenol resin, kneaded, and molded, and the molded body is calcined to obtain a porous plug. To the aggregate granules may be added spherical alumina granules. |
