Magnetic disk substrate and method of manufacturing the same

Details Magnetic disk substrate and method of manufacturing the same Magnetic disk substrate and method of manufacturing the same

C - Chemistry, Metallurgy

22

C

75/51, 148/35.7

C22C 14/00 (2006.01) C22F 1/18 (2006.01) G11B 5/62 (2006.01) G11B 5/73 (2006.01) G11B 5/82 (2006.01) G11B 5/84 (2006.01)

Patent

CA 2018915

Abstract of the Disclosure A magnetic disk substrate comprising 0.5 wt% to 1.0 wt% of Mo, 0.03 wt% to 0.5 wt% of O + 2N + 0.75C, and a balance of Ti. The alloy plate having a com- position of above range is cold-rolled at a rolling ratio of 30% or more to form a magnetic disk substrate material, and the material is thermal-flattened under the following condition: 500 ? T ? -(150/11)?t + 7850/11 1 ? t where T represents a thermal-flattening temperature (°C), and t represents a thermal-flattening time (houre), thereby obtaining a magnetic disk substrate having the average grain size of 30 µm or less.

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