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Effect of gas corrosion on the character of phase boundaries in Ni3Al / WC composite

Fraś E., Janas A., Kolbus A., Olejnik E.

Archives of Foundry Engineering

2009

Vol. 9, iss. 2

87-92

In view of quite specific physico-chemical and performance properties, the composite based on an intermetallic Ni3Al compound reinforced with tungsten carbides (WC) was selected for investigations. The said composite is characterised by very good mechanical and tribological properties within a wide range of temperatures, combined with good corrosion resistance. In fabrication of the Ni3Al/WC composite, a modified variant of the SHS process was applied. It is the SHSB process, i.e. the Self-Propagating High-Temperature Synthesis in Bath. The said method enables obtaining pure products of reaction, unoxidised and free from the precipitates of alien phases. The main goal of this study has been determination of the susceptibility of the Ni3Al/WC composite to gas corrosion. To examine the microstructure and chemical composition of both the composite and the scale, the metallographic and structural examinations were made, using optical and scanning microscopy.