Abstract

Cr-Si intermetallic compound coatings were coated on an austenitic stainless steel SUS310S substrate by pulsed electric current sintering process to improve its wear and oxidation resistances. The coating was carried out for 0.6-10.8 ks at 1073-1323 K at a coating pressure of 60 MPa. As a result of pin-on-disk wear test, the wear property of the coatings was more excellent than that of the substrate. The tensile strength of the coatings was 10-20 MPa. These coatings fractured at the interface between the coatings and the substrate during tensile test. As a result of hot hardness test, the coatings showed higher hardness than the substrate, even at high temperature. Hardness of the coatings fell gradually up to the transition temperature of 870 K and decreased rapidly on further heating. As a result of oxidation-testing for 700 ks at 1123 K, the mass increase of the coatings after oxidizing was less than that of the substrate. These results indicate that wear resistance and strength at elevated temperature could be given to the substrate without deteriorating oxidation resistance.

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