High-Temperature Tribological Properties of Al₂O₃-X (X: BaCrO₄, BaSO₄ and CaSO₄) Spark-Plasma-Sintered Composites Containing Sintering Additives

Abstract

Composites of Al₂O₃-X (X: BaCrO₄, BaSO₄ and CaSO₄) systems were prepared by spark plasma sintering, and their friction and wear properties were evaluated from room temperature to 1073 K. With the addition of Na₂SiO₃, SiO₂ and Ag to the Al₂O₃-BaCrO₄ composites exhibited improved densification. In particular, the wear rates of the Al₂O₃-BaCrO₄ composites were notably reduced from room temperature to 1073 K with the addition of SiO₂. Al₂O₃-BaSO₄ composites, both with and without SiO₂ as a sintering additive, showed friction coefficients as low as 0.5 from room temperature to 1073 K, while the friction coefficients of the Al₂O₃-50CaSO₄-5SiO₂ (mass%) composites were as high as 1.2 at 473 K.