Oxygen Interception for Air Plasma Spray Processes
OwnerAndrei V. Ivanov, Daming Wanginventors
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Abstract
The present invention generally relates to an atmospheric spray process for producing a controlled conical shrouded oxygen gas stream designed to intercept a plasma effluent stream to inject and mix oxygen with powder particles contained in the plasma effluent prior to the molten power particles entrained in the plasma effluent solidifying on a substrate.
Claims15
A method of injecting oxygen into a plasma effluent during production of a coating, comprising:
- introducing one or more process gases into an air plasma spray torch to generate a plasma;
- introducing a flow of powder particles with a carrier gas into the plasma or in close proximity thereto to produce the plasma effluent,
- forming an oxygen gas stream;
- and
- intercepting the plasma effluent with the oxygen gas stream.
A method of injecting oxygen into a plasma effluent during production of a coating, comprising:
- positioning an air plasma spray torch at a predetermined standoff distance, said predetermined standoff distance measured as an axial distance from a front surface of the air plasma spray torch to a substrate;
- introducing one or more process gases into the air plasma spray torch to generate a plasma;
- introducing a flow of powder particles with a carrier gas into the plasma or in close proximity thereto to produce a plasma effluent,
- forming a conical shrouded oxygen gas stream around a portion of plasma effluent;
- and
- intercepting the plasma effluent with the conical shrouded oxygen gas stream at an apex point of the conical shrouded gas stream.
A method of injecting oxygen into a plasma effluent during production of a coating, comprising:
- positioning an air plasma spray torch at a predetermined standoff distance, said predetermined standoff distance measured as an axial distance from a front surface of the air plasma spray torch to a substrate;
- introducing one or more process gases into an air plasma spray torch to generate a plasma;
- introducing a flow of powder particles with a carrier gas into the plasma or in close proximity thereto to produce a plasma effluent;
- and
- forming multiple conical shrouded oxygen gas streams around a portion of the plasma effluent;
- wherein each of said multiple conical shrouded gas streams intercepts the plasma effluent at a corresponding interception point, said corresponding interception point located along a corresponding apex of each of said multiple conical shrouded oxygen gas streams.
Dependencies are inferred from the claim text.