| 摘要 |
PROBLEM TO BE SOLVED: To improve sliding durability by forming a protective layer from carbon-based or oxide ceramic materials and forming a lubricant layer of a mixture of first and second fluorine-contg. compds. expressed by specified formulae on the protective film layer. SOLUTION: A Ni-P plating film is formed on an aluminum alloy substrate, and then successively a base film, magnetic recording layer and protective film layer are deposited thereon. A fluorine-contg. compd. expressed by formula I having 500 to 5000 number average mol.wt. and a second fluorine-contg. compd. expressed by formula II having 500 to 5000 number average mol.wt. are mixed by 25 to 400wt.% proportion to obtain a lubricant and to prepare a coating compsn. In formulae I, II, (p) and (q) are integers. The obtd. compsn. is applied to 20Åfilm thickness by dipping method on the surface of the protective film layer. Thereby, the obtd. medium shows excellent lubricating property and wear resistance, chemical stability even at high temp. for a long time, and improved reliability. |
