Magnetic disk substrate and method of manufacturing the same
US5120615A · kind A · utility
3Cited by
1References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 12, 1990 |
| Grant date | Jun 9, 1992 |
| Priority date | — |
| Expiry date | Jun 12, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/73919
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic disk substrate composition 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 sheet having a composition 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: EQU 500.ltoreq.T.ltoreq.-(150/11).multidot.t+7850/11 EQU 1.ltoreq.t where T represents a thermal-flattening temperature (.degree.C.), and t represents a thermal-flattening time (houre), thereby obtaining a magnetic disk substrate having the average grain size of 30 .mu.m or less.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.