Method of producing coating using negative DC pulses with specified duty factor
US5192578A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 14, 1990 |
| Grant date | Mar 9, 1993 |
| Priority date | — |
| Expiry date | Nov 14, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C14/325
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
For coating workpieces having basic bodies (3), with a ceramic, electrically non-conducting material, during the coating process a pulsating dc voltage is applied to the basic bodies (3) or their holders (36). Preferably the pulse height is changed during vaporization used for the coating process, from high negative values to smaller negative values. A further layer can be applied onto the workpieces coated in this way whereby these work-pieces, due to their excellent corrosion resistance, are suited as pieces of jewelry which can be exposed in particular to ocean water and body perspiration, as rolling bodies in which the use of oil or grease as corrosion protection can be dispensed with, and as separating and cutting tools for organic materials.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.