透光性多結晶アルミナの焼結(<小特集>セラミック材料小特集)

概要

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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 ester process. (2) The preferred additives are Y_2O_3 or HfO_2 in addition to MgO. (3) The preferred manufacturing conditions are the molding pressure higher than 700 kg/cm^2, calcination at 1 000 to 1 100℃ in air, and firing at 1 800 to 1 820℃ for 1 hour in vacuum (1×10^<-4>-10^>-5<mmHg).
社団法人日本材料学会の論文
1982-10-15