High-Temperature Friction and Wear Properties of X-BaSO₄ (X: Al₂O₃, NiAl) Composites Prepared by Spark Plasma Sintering

Abstract

X-BaSO₄ (X: Al₂O₃, Ni-Cr alloy and NiAl) composites were prepared by spark plasma sintering, and their friction and wear properties were investigated from at temperatures ranging from room temperature to 1073 K in air. The friction coefficients of the Al₂O₃-50 mass% BaSO₄ composites varied from 0.2 to 0.4 at the temperature range. The NiAl-50 mass% BaSO₄ composites and Ni-Cr alloy-based composites containing 50 mass% BaSO₄ showed low friction coefficients at temperatures over 873 K, although their friction coefficients were higher than 0.5 at 473 K and 673 K. The wear rates of the Al₂O₃-50 mass% BaSO₄ composites were much higher than those of the NiAl-50 mass% BaSO₄ composites and Ni-Cr alloy-based composites containing 50 mass% BaSO₄ at room temperature. In order to improve the wear resistance of the Al₂O₃-50 mass% BaSO₄ composites, it would be necessary to use fine Al₂O₃ and BaSO₄ powders and to add some sintering additives to the composites.