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US 8,507,826 B2Granted
Microplasma spray apparatus and method for coating articles using same
AssigneeUnited Technologies Corporation
InventorsDonn R. Blankenship, Paul H. Zajchowski, Gary C. Shubert
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Abstract
A microplasma spray coating apparatus includes a microplasma apparatus with an anode, cathode, and an arc generator for generating an electric arc between the anode and cathode. An arc gas emitter injects inert gas through the electric arc. The electric arc is operable for ionizing the gas to create a plasma gas stream. A powder injector nozzle extends through the anode and injects powdered material into the plasma stream for transfer to the workpiece.
Claims18
A plasma spray apparatus for coating a workpiece, comprising:
- an anode, a cathode, and an arc generator generating an electric arc between the anode and cathode;
- a nozzle to emit arc gas into the electric arc, the electric arc operable for ionizing the gas to create a plasma gas stream;
- a powder hopper for holding the powdered material prior to the powdered material being injected into the plasma gas stream;
- a feeder extending through the anode to provide powdered material into the plasma gas stream, wherein the feeder uses a carrier gas to entrain the powdered material through a powder injector nozzle.
1 more element
Dependencies are inferred from the claim text.