| 摘要 |
PURPOSE:To prevent the corrosion of magnetic films arising from the elution of ions by providing coating layers essentially consisting of amorphous silica on the surfaces of glass and roughening the surfaces of the coating layers by a mechanical method, then baking said layers. CONSTITUTION:A disk 1 consisting of soda lime silica glass is immersed into a coating liquid prepd. by hydrolysis and condensation of ethyl silicate, then pulling up to form the coating layers 2. After the coating layers are air dried, lapping tapes are pressed to the glass for 1min from both faces thereof at a speed of 10cm per minute while the glass is rotated by using the tapes to form concentrical ruggedness on the surface of the coating layers. The disk is subjected to spraying of pure water for the purpose of cooling at this time and is then subjected to ultrasonic cleaning followed by vapor cleaning with isopropanol and drying. The magnetic films and protective films are formed thereon by a sputtering method after the coating layers are baked by heating at 200 deg.C in the atm. The magnetic film consists of an underlying Cr layer of 1,500Angstrom and a Co-Ni layer of 600Angstrom and the protective layer consists of carbon of 300Angstrom . The elution of the ions is thereby prevented and the durability in corrosive environment is obtd.
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