Powder metal process for preparing computer disk substrates
US4569822A · kind A · utility
Inventors
Key dates
| Filing date | May 11, 1984 |
| Grant date | Feb 11, 1986 |
| Priority date | — |
| Expiry date | May 11, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/73919
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method is provided for preparing computer disk substrates having low surface amplitude which comprises: (a) forming a liquid suspension containing aluminum powder, an aluminum alloying element and a borate composition by initially admixing the borate composition with a volatile liquid medium to obtain a borate solution and thereafter admixing the aluminum powder and aluminum alloying element with the borate solution to produce the liquid suspension; (b) heating the liquid suspension to remove the liquid medium and to obtain a dry aluminum powder composition; (c) isostatically pressurizing the dry aluminum powder composition and roller compacting the same into sheet form; (d) heating and sintering the sheet form in a non-oxidizing atmosphere; and (e) cutting and compressing the sintered sheet into computer disk substrate configuration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.