Method and apparatus for thermal spraying of metal coatings using pulsejet resonant pulsed combustion
AssigneeThe United States of America as represented by the Administrator of the National Aeronautics and Space Administration
InventorDaniel E. Paxson
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Abstract
An apparatus and method for thermal spraying a metal coating on a substrate is accomplished with a modified pulsejet and optionally an ejector to assist in preventing oxidation. Metal such as Aluminum or Magnesium may be used. A pulsejet is first initiated by applying fuel, air, and a spark. Metal is inserted continuously in a high volume of metal into a combustion chamber of the pulsejet. The combustion is thereafter controlled resonantly at high frequency and the metal is heated to a molten state. The metal is then transported from the combustion chamber into a tailpipe of said pulsejet and is expelled therefrom at high velocity and deposited on a target substrate.
Claims14
An apparatus for thermally spraying a metal coating comprising:
- a pulsejet having a combustion chamber producing resonant pulsed combustion and a tail pipe;
- a metal-feeder supplying metal wire into said combustion chamber of said pulsejet where said metal wire is heated to a molten state;
- and
- wherein thermally spraying a metal coating is accomplished by transporting the molten metal from the combustion chamber into the tail pipe and expelling the molten metal at high velocity onto a target substrate.
Dependencies are inferred from the claim text.