Plasma spray method for applying a coating utilizing particle kinetics
US6861101B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 19, 2002 |
| Grant date | Mar 1, 2005 |
| Priority date | — |
| Expiry date | Apr 10, 2023 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C4/134
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A method of operation of a plasma torch. A cold high pressure carrier gas containing a powder material is injected into a cold main high pressure gas flow and then this combined flow is directed coaxially around a plasma exiting from an operating plasma generator and converging into the hot plasma effluent, mixing with the effluent to form a gas stream with a net temperature, based on the enthalpy of the plasma stream and the temperature and volume of the cold high pressure converging gas, such that the powdered material will not melt. The combined flow with entrained is directed through a supersonic nozzle accelerating the flow to supersonic velocites sufficient that the particles striking the workpiece achieve kinetic energy transformation into elastic deformation of the particles as they impact the workpiece forming a cohesive coating.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.