Memory disk sheet stock and method
US5554428A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 1, 1994 |
| Grant date | Sep 10, 1996 |
| Priority date | — |
| Expiry date | Sep 1, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31678
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
There is disclosed an improved memory disk stock comprised of an alloy composition which includes: about 1-11 wt. % magnesium, preferably between about 2-7 wt. % Mg; up to about 0.3 wt. % zirconium, preferably about 0.02-0.25 wt. % Zr; up to about 0.2 wt. % iron, up to about 0.2 wt. % silicon, and about 0.05-1 wt. % of a dispersoid-forming element selected from scandium, erbium, thulium, lutetium, ytterbium, hafnium and yttrium, the balance aluminum and incidental elements and impurities. With preferably about 0.1-0.45 wt. % of scandium added to such compositions, these disk stocks exhibit a two- to three-fold increase in strength over the same compositions without any scandium added. They result in magnetic media recording devices having improved temperature resistance with average yield strengths of 30 ksi or more. There is also claimed an improved method for making such memory disk devices.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.