Abstract

Since its commercial introduction in the early 1980s, it has been known that HVOF spraying can produce layers with low oxide levels, high toughness, and excellent adhesive strength. Compared to low-pressure plasma and vacuum plasma spraying, the HVOF process is based on different melting dynamics, which do not require the use of a controlled atmosphere. As a result, the original oxygen content of the wettable powder plays a significant role with regard to the layer quality. In this paper, the oxygen content of normal MCrAlY powder is varied and its influence on the quality of the sprayed coating is examined. It is concluded that, by controlling and limiting the initial oxygen content in the spray powder, better layer qualities with lower oxide proportions and higher density can be achieved. Paper includes a German-language abstract.

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