2024年4月11日发(作者：)

专利内容由知识产权出版社提供

专利名称：Nonmagnetic substrate material and

magnetic head

发明人：NITSUTA HIDEO,新田 英雄,YAMADA

NOBUYUKI,山田 信行

申请号：JP特願平7-179943

申请日：19950717

公开号：JP第2721320号B2

公开日：19980304

摘要：PROBLEM TO BE SOLVED: To obtain a nonmagnetic base material by adding a

specific material to La2 O3 , CoO and NiO and baking, having magnetic head

characteristics as a magnetic thin film, suitable as a material requireng a high thermal

expansion and to improve environmental resistance, fine processability and reliability.

SOLUTION: La2 O3 in an amount of 15-35mol% calculated as LaO3/2 , 40-60mol% of CoO,

15-35mol % of NiO and 0.1-20mol % of one or more of Al2 O3 , Y2 O3 , SiO2 , ZrO2 and

TiO2 are weighed as raw materials, mixed by a wet ball mill, dried, and calcined at 700-

1,000C. The prepared calcined material is ground, mixed with about 1 % of a PVA-based

organic binder and granulated to give a compact. The compact is sintered in the

atmosphere, in nitrogen or in their mixed atmosphere at 1,200-1,400 deg.C, further

subjected to hot isostatic pressing (HIP) treatment at about 1,250 deg.C under 1,000-

1,500 atmospheric pressure to give a nonmagnetic bases material having 140-200×10<-

7> / deg.C coefficient of thermal expansion, 500-1,200kgf/mm<2> Vickers hardness and

<=5mm crystal grain diameter. The nonmagnetic material is used to give a magnetic

head.

申请人：HITACHI KINZOKU KK,日立金属株式会社

地址：東京都千代田区丸の内2丁目1番2号

国籍：JP

代理人：大場 充

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