Abstract

Cost-efficient techniques that make economic use of raw materials must be found for the wear and corrosion protection of all parts for high performance applications. “Compound construction” offers an excellent means of meeting these stipulations by the use of a simple base material with a thin coating of hard material powder or hard alloy powder applied by thermal spraying. A full range of metallic and non-metallic hard material powders and a large number of hard alloy powders are available for plasma spraying and plasma welding processes. New powder grades are constantly under development. The deposition method most suited to hard material powders is non-transferred-arc plasma spraying, whereas transferred-arc plasma welding is preferable for hard alloy powders. This paper reviews the metallic and non-metallic hard materials and hard alloys and some recent developments relating to those powders which are important for the plasma process.

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