High-temperature friction and wear properties of X-BaSO 4 (X: Al 2O 3, NiAl) composites prepared by spark plasma sintering

Abstract

X-BaSO 4 (X: Al 2O 3, 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 Al 2O 3-50mass% BaSO 4 composites varied from 0.2 to 0.4 at the temperature range. The NiAl-50 mass% BaSO 4 composites and Ni-Cr alloy-based composites containing 50 mass% BaSO 4 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 Al 2O 3-50 mass% BaSO 4 composites were much higher than those of the NiAl-50 mass% BaSO 4 composites and Ni-Cr alloy-based composites containing 50mass% BaSO 4 at room temperature. In order to improve the wear resistance of the Al 2O 3-50mass% BaSO 4 composites, it would be necessary to use fine Al 2O 5 and BaSO 4 powders and to add some sintering additives to the composites. © 2005 The Japan Institute of Metals.