Method of manufacturing a magnetic disk substrate

Metal treatment – Process of modifying or maintaining internal physical... – Utilizing disclosed mathematical formula or relationship

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148504, 148505, 148670, C21D 1100

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051886774

ABSTRACT:
A method of manufacturing a titanium alloy magnetic disk substrate comprising (a) cold-rolling an alloy plate at a rolling ratio of no less than 30%, the alloy plate comprising 0.5 wt. % to 1.0 wt. % of Mo and containing oxygen, nitrogen and carbon in amounts such that O+2N+0.75C is from 0.03 wt. % to 0.5 wt. % of the titanium alloy, and the balance being Ti, wherein O is the wt. % of oxygen, N is the wt. % of nitrogen and C is the wt. % of C to form a magnetic disk substrate material and then (b) thermal-flattening the magnetic substrate material from step (a) under a condition defined as follows:

REFERENCES:
patent: 4886559 (1989-12-01), Shindo et al.
patent: 4908072 (1990-03-01), Taki et al.
patent: 4990362 (1991-02-01), Kibe et al.
Kyuzo Nakamura, "Metals & Technology", No. 1986, pp. 38-43.
Masahiro Saito et al, "Jitsumu Hyomen Gijutsu", vol. 35, No. 6, 1988, Practical Surface Technology, pp. 6-11.
Hiroyoshi Ishizaki, "Kogyo Zairyo", vol. 35, No. 5 pp. 89-95, Engineering Materials.
Denshi Zairyo Hyomen Shori Gijutsu, Jul. 1987, (Electronic Material Surface Treatment Technology).

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