| 摘要 |
PROBLEM TO BE SOLVED: To provide a spinel structure which is free from a distortion, a deformation and cracks and is of a uniform quality and a high mechanical stability and further maintains its use strength and withstands a temperature change, and especially a method for manufacturing the spinel structure. SOLUTION: A composition for molding which contains a spinel powder and, together with it, an extrusion assistant, a stabilizing agent, a shrinkage reducing agent and a foaming agent or a mixture of the former or which does not contain the described components, is extruded. Next, these extrusion moldings are dried and baked to obtain the spinel extrusion moldings. The composition for molding contains an aluminum oxide or an aluminum oxide hydrate and a metallic nitrate. |
