透光性多結晶アルミナの焼結
Sintering of Translucent Polycrystalline Alumina

Hiroshi SENO, Kiichi MINAI, Kikuo WAKINO
1982 Journal of the Society of Materials Science Japan  
Translucent polycrystalline alumina is very useful as a material for trimmer capacitors in microwave tele-communication systems because of its excellent electrical and mechanical properties. In this paper, raw materials for alumina, additives, and manufacturing conditions were investigated for the improvement in properties of capacitors. The followings are the main conclusions. (1) The preferred raw materials for alumina are aluminium sulfate, ammonium salt, and hydrated alumina from the methyl
more » ... ester process. (2) The preferred additives are Y2O3 or HfO2 in addition to MgO. (3) The preferred manufacturing conditions are the molding pressure higher than 700kg/cm2, -10-5mmHg).
doi:10.2472/jsms.31.949 fatcat:vwz6st5onbcpfethlskr5egmhm