High velocity thermal spray gun for spraying plastic coatings
AssigneeThe Weidman Company, Inc.
InventorLarry G. Weidman
Life of this patent
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Abstract
A high velocity, oxygen fuel ("HVOF") thermal spray gun for spraying a melted powder composition of, for example, thermoplastic componds, thermoplastic/metallic composites, or thermoplastic/ceramic composites onto a substrate to form a coating thereon. The gun includes an HVOF flame generator for providing an HVOF gas stream to a fluid cooled nozzle. A portion of the gas stream is diverted for preheating the powder, with the preheated powder being injected into the main gas stream at a downstream location within the nozzle. Forced air and vacuum sources are provided in a shroud circumscribing the nozzle for cooling the melted powder in flight before deposition onto the substrate.
Claims35
A thermal spray apparatus for spraying molten substrate coatings, comprising:
- high velocity oxygen fuel ("HVOF") generating means;
- an elongated nozzle downstream from and in flow communication with said HVOF generating means for receiving an HVOF stream therefrom, said elongated nozzle including a fluid cooled barrel therein, said barrel having a central bore therethrough with an inlet opening and an outlet opening;
- means for the introduction of a feed substrate into said HVOF stream at a point within said nozzle downstream from said inlet opening;
- means for circulating cooling gas exteriorly of and around said nozzle;
- and,
- means for preheating said feed substrate to a preselected temperature prior to introduction into said HVOF stream.
Dependencies are inferred from the claim text.