Titanium discs useful for magnetic discs

Details Titanium discs useful for magnetic discs Titanium discs useful for magnetic discs

1994-06-06

1995-12-26

Zimmerman, John

Stock material or miscellaneous articles

All metal or with adjacent metals

Microscopic interfacial wave or roughness

428660, 428687, 428928, 428694SG, G11B 582

Patent

active

054786576

ABSTRACT:
The object of the present invention is to provide titanium discs to be used as high-density read-while-write magnetic discs. Further object of the present invention is to provide said titanium discs coated with a non-magnetic plated layer.
Titanium discs to be used as magnetic discs which satisfy the above object have the following structures: A titanium disc to be used as magnetic disc having the mean height of the peaks from the center line, R.sub.a, of 0.0002 .mu.m to 0.0060 .mu.m and pits on its surface of 25 .mu.m or less in diameter or 5 .mu.m or less in depth. Further, said titanium disc to be used as a magnetic disc is coated with a non-magnetic plated layer with a thickness of 0.09 .mu.m to 5 .mu.m. Moreover, a titanium disc that is most suitable to be used as a magnetic disc is the titanium disc provided with a plated layer of 30/100 or less in a knife-cut peeling test.

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Hirayama, Metal Surface Technology, 38:378-385 (1987) no month.
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Fukuni, eta l., 79th Seminar Report of Surface Technology Association, pp. 230-231 (1989) no month.

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