Plasma spray method for applying a coating utilizing...

Details Plasma spray method for applying a coating utilizing... Plasma spray method for applying a coating utilizing...

2005-03-01

2005-03-01

Bareford, Katherine (Department: 1762)

Coating processes

Spray coating utilizing flame or plasma heat

Metal or metal alloy coating

C427S446000, C427S447000, C427S452000, C427S453000, C427S456000

Reexamination Certificate

active

06861101

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.

REFERENCES:
patent: 4916273 (1990-04-01), Browning
patent: 5302414 (1994-04-01), Alkhimov et al.
patent: 6139913 (2000-10-01), Van Steenkiste et al.
patent: 20020168466 (2002-11-01), Tapphorn et al.
U.S. Provisional Application 60/286,256, filed Apr. 24, 2001.

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