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Progress in Plasma Processing of Materials, 1997

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Underwater-Plasma Spraying - new developments in plasma spray processes and powder treatment under water

Erick Lugscheider
Werkstoffwissenschaften Lehr und Forschungsgebeit der RWTH Jiilicher Sir. 342-352 52070 Aachen; Surface Engineering Institute (IOT), RWTH University of Technology Aachen, Augustinerbach 4-22, 52066 Aachen, Germany

H. Reymann
Materials Science Institute, University of Technology Aachen

I. Rass
EUROMAT GmbH, Huckelhoven


Modern coating techniques offer the possibility of corresponding to the increased requirements on component surfaces by the application of thin, high property functional coatings. Thermal sprayed coatings are produced in air (APS), vacuum (VPS) and inert atmospheres (IPS). Underwater plasma spraying (UPS) is an addition to these process variants which completely operates under water. Up to now a lot of different materials including carbides, oxides and other materials such as MCrAlY, cermets and nickel based hard alloys have been processed under water. Dense coatings with thicknesses up to 0,2 mm/layer have been achieved. An autoclave allows spraying at increased pressure levels simulating greater water depths up to 30 m. This publication reveals the technology of underwater plasma spraying used for the production of coatings and powder treatment.