发明授权
- 专利标题： Recording disk substrate members and process for producing same
- 专利标题（中）： 记录盘基片及其制造方法
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申请号： US759366申请日： 1985-07-26
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公开(公告)号： US4690846A公开(公告)日： 1987-09-01
- 发明人: Toshiaki Wada , Yoshiaki Katsuyama , Junichi Nakaoka
- 申请人： Toshiaki Wada , Yoshiaki Katsuyama , Junichi Nakaoka
- 申请人地址： JPX Osaka
- 专利权人： Sumitomo Special Metals Co., Ltd.
- 当前专利权人： Sumitomo Special Metals Co., Ltd.
- 当前专利权人地址： JPX Osaka
- 优先权： JPX59-169409 19840815
- 主分类号： G11B5/82
- IPC分类号： G11B5/82 ; G11B5/73 ; G11B5/84 ; H01F10/02 ; B05D1/38 ; B32B7/02
摘要：
A substrate member for recording disk characterized in that a glass coating film is provided on an alumina base ceramic material having micropores of no larger than 5 microns and a relative theoretical density of no less than 96%, said glass coating film having a surface roughness of no more than 80 angstroms, being substantially pore-free and strain-free on the surface, and having a thickness of 0.3 to 200 microns and a relative difference of no more than 10.sup.-6 /deg in the coefficient of thermal expansion with respect to said base material.
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