Abstract
Cavitation erosion tests were carried out for Ti-Ni shape memory alloy solid and coating using stationary specimen method of vibratory apparatus. The alloy coating was made by sputter deposition and was heat-treated at 300, 500 and 700°C. The coatings without heat treatment and with treatment at 300°C were completely peeled off after reaching the substrate due to cavitation, and the coatings heated at 500 and 700°C were strong enough to have high resistance of the erosion. A transition of mass loss rate was observed against the temperature of heat treatment. The mass loss rate changes from high to low at 400°C, because of the crystallization at this temperature. The mass loss rate of the coatings heat treated at 500 and 700°C corresponds well with that of the alloy solid. It was concluded that the erosion resistance in Ti-Ni shape memory alloy coating is about 20 times superior to that of stelite 6B.
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