Friction and Wear Characteristics of BaCrO Ceramics at Elevated Temperatures in Sliding Against Sintered Alumina Ball.

In this article, friction and wear characteristics of BaCrO ceramics have been investigated using a high-temperature friction and wear tester from room temperature to 800 °C in dry sliding against sintered alumina ball. At room temperature, the friction coefficient and wear rate of BaCrO ceramics are quite high. BaCrO ceramics exhibit low friction coefficients and small wear rates with temperature increasing up to 400-600 °C. The oxidation reaction of BaCrO during high-temperature wear tests is responsible for the tribological properties. The oxidized product of BaCrO is BaCrO, which forms a smooth self-lubricating film on the worn surface to effectively reduce friction and wear. However, at 800 °C, severe oxidation reduces the relative density of sintered BaCrO ceramics, and further expedites the materials removal process. [ABSTRACT FROM AUTHOR]