Abstract
Ni-SiC composite coatings were obtained on mild steel substrates by a sediment codeposition technique. The bond strength and surface roughness of the coatings (before and after heat treatment at 800 and 1000 °C) were measured with an Elcometer (adhesion tester) and C5D perthometer respectively. The structure of the coatings was examined by optical and scanning electron microscopy. The results of the investigations reveal that heat treatment improved the bond strength of the coatings although there was a decrease in their hardness after heat treatment. There was no marked change in surface roughness of the heat-treated samples. SiC is unstable with the nickel matrix at 800 °C and above.
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