Method of electrolytic texturing and electrolytic liquid slurry
US6287449A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 16, 1999 |
| Grant date | Sep 11, 2001 |
| Priority date | — |
| Expiry date | Nov 16, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/8404
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
An electrolytic liquid slurry containing pure water, abrading particles and nitric acid, boric acid, alkanol amine, sodium sulfite, sodium chloride, ammonium chloride, sodium phosphate, potassium phosphate, sodium silicate, aluminum phosphate, ammonium phosphate, diethanolamide borate, amine borate, sodium metaborate, propylene glycol or their liquid mixture is supplied to the surface of a magnetic hard disk substrate or the surface of a tape. The tape is pressed against the surface of the disk substrate and a voltage difference is applied between an electrode disposed in contact with the electrolytic liquid slurry and the disk substrate which serves as another electrode. Since texturing and electrolytic processes are thus carried out simultaneously, the stock removal can be increased and the throughput can be improved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.