专利名称：PRODUCTION OF NONMAGNETIC
CERAMICS FOR MAGNETIC HEAD
发明人：KOZUKA YOSHINARI,TSUJI HIROYASU 申请号：JP4850288
申请日：19880301
公开号：JPH0513107B2
公开日：
unequal
19930219
专利内容由知识产权出版社提供
摘要：PURPOSE:To produce the nonmagnetic ceramics for magnetic heads which has a high density and high mechanical strength, is free from unequal colors, and has high mass productivity by mixing and molding ceramics raw material compsns., then calcining the mixture in a specific oxygen-contg. atmosphere. CONSTITUTION:The ceramics raw material compsns. such as BaO-TiO2 and CaO-TiO2 are mixed and molded and thereafter, the molding is calcined in the oxidative atmosphere contg. at least 80vol.% oxygen. The nonmagnetic ceramics for magnetic heads which has the high density of about >=99% sintering density, the high deflection strength, is free from unequal colors and is adequate for magnetic core materials such as Mn-Zn ferrite and Ni-Zn ferrite is obtd. in this way. The ceramics free from unequal colors is obtd. by holding the ceramics with which the unequal colors are formed by the high-temp. calcination at about 900-1100 deg.C in the atmosphere contg. >=80vol.% oxygen to eliminate the reduction color.
申请人：NGK INSULATORS LTD
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