| 摘要 |
PURPOSE:To obtain a core material, having excellent thermal conductivity, electrical insulating properties and dimensional accuracy, by blending alumina powder with a flux consisting of CaO, MgO and SiO2, molding the resultant blend and firing the molded product. CONSTITUTION:A core material consisting of an alumina based sintered compact obtained by adding and blending a flux having a composition consisting of 2-20wt.% CaO, 2-30wt.% MgO and 50-80wt.% SiO2 in an amount of 2-10wt.% based on alumina powder therewith, molding the resultant blend and firing the molded product. The above-mentioned alumina based sintered compact is normally produced by sufficiently kneading alumina powder having 1-10mu average particle diameter and the flux components with other additives, such as binder or dispersing agent, extrusion molding the obtained kneaded material into the form of a core material using an extrusion molding machine, placing each or plural resultant molded products on a setter having the cross section constituting the form of V or setter constituting a semicircle and sintering the molded product. |
