Finishing of tungsten carbide surfaces
US6004189A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 15, 1997 |
| Grant date | Dec 21, 1999 |
| Priority date | — |
| Expiry date | Sep 15, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C30/00
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A tungsten carbide surface is finished to an RMS surface roughness of about 25 nm (1.0 microinch) or less by abrasion using diamond grit particles. The tungsten carbide surface is abraded by a sequence of grit particle-containing abrasive members, such as abrasive films, pastes, or slurries, at least one of the members having an average grit particle diameter of about 2 .mu.m or less. The finish is enhanced by oscillating the abrasive member back and forth over the tungsten carbide surface. A different speed is used for at least two consecutive films in the series, thereby generating scratches at different angles which can be distinguished. A superfinish, corresponding to a lack of visible scratches at 100X magnification, can be obtained by abrading the tungsten carbide surface with a diamond slurry or paste having grit particles with an average diameter of about 1 .mu.m or less.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.