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专利名称：Method and apparatus for coating a
substrate
发明人：STEPHEN L. THALER申请号：AU2112797申请日：19970124公开号：AU2112797A公开日：19980818
摘要：A method and apparatus for coating the surface of a substrate suspends acoating material above the surface of the substrate and irradiates both the coatingmaterial and the underlying surface of the substrate. By irradiating both the coatingmaterial and the underlying surface of the substrate, a first portion of the coatingmaterial is melted to form an at least partially molten droplet of coating material. Inaddition, at least a second portion of the coating material is ablated to thereby create anablation plume which propels the at least partially molten droplet of coating materialtoward the substrate. In addition, the portion of the substrate toward which the at leastpartially molten droplet of coating material is propelled is simultaneously heated, suchthat the at least partially molten droplet coating material adheres to the heatedsubstrate, thereby coating the surface of the substrate. Thus, a metallic powder can besuspended within a carrier and can be directed along the substrate so as to be irradiatedby a pulse of laser energy. The ablation of the coating material also forms at least asecond portion of the coating material into a plasma which is deposited within and atleast partially fills the depressions or voids within the coating of the substrate followingthe adherence of the at least partially molten droplet of coating material to the surface
of the substrate. Thus, a relatively continuous, smooth coating can be deposited uponthe surface of a substrate.
申请人：MCDONNELL DOUGLAS CORPORATION
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