Plasma gun apparatus for forming dense, uniform coatings on large substrates
US5679167A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 18, 1994 |
| Grant date | Oct 21, 1997 |
| Priority date | — |
| Expiry date | Aug 18, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C4/137
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A plasma system forms a dense, uniform coating of metallic oxide or other material on a relatively large substrate of metal foil or other composition located a substantial distance from the plasma gun so that the plasma stream covers the entire width of the substrate. A large pressure differential between the pressure inside the plasma gun and the ambient pressure outside of the plasma gun creates a shock pattern within the exiting plasma-stream so as to disperse the plasma stream and maintain a high energy level therein, as well as thoroughly mixing a coating material introduced into the plasma stream within the gun. Mixing of the coating material within the plasma stream is further enhanced by introducing the coating material into the plasma stream in the form of very small particles. In one arrangement, the plasma stream is delivered in a long, narrow configuration across the width of the substrate by a nozzle with a slit-like opening at the lower end of the plasma gun. In still other arrangements, a plasma stream of elongated configuration is provided by a plasma gun of elongated configuration having an elongated cathode assembly disposed within the hollow interior of an elonga…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.