Abstract

Coatings that are thermally sprayed at high speed are used to improve wear resistance. The Center for Thermal Spraying at the University of Barcelona has developed a special process. This process enables the molded parts to be manufactured using high velocity oxygen fuel injection molding. A number of thermally sprayed cermet materials have already been developed. The novel system consists of a mechanically mixed chromium(III) oxide-NiCr-NiCrBSi alloy. This paper includes the characterization of the structure, the evaluation of the wear resistance, and the corrosion behavior of layers with 20, 40, and 60% NiCrBSi volume fraction. The structure is characterized using a light microscope and a scanning electron microscope (SEM). The phase determination and distribution is carried out using an image analysis and an X-ray phase analysis. The wear behavior is investigated with ball-on-disc (ASTM G65-91), SEM, and SLWI. The corrosion behavior is characterized with electrochemical analysis and SEM-EDS. Paper includes a German-language abstract.

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