Tribological evaluation of PS300: A new chrome oxide-based solid lubricant coating sliding against Al2O3 from 25 degrees to 650 degrees C

This paper presents the tribological characteristics of Al2O3 sliding against PS300, a chrome oxide-based self-lubricating coating. Al2O3 pins were slid against PS300-coated superalloy disks in air under a 4.9 N load at velocities of 1 to 8 m/s. At a sliding velocity of 1 m/s, friction ranged from 0.6 at 25 degrees C to 0.2 at 650 degrees C. Wear factors for the Al2O3 pins were in the 10(-7) mm(3)/N-m range and in the 10(-5) mm(3)/N-m range for the PS300 coating. The test results suggest that increased surface temperature resulting from either functional heating, generated by increased sliding velocity, or ambient heating caused a reduction in friction and wear of the sliding couple. Based upon these results, the tested material combination is a promising candidate for high temperature wear applications.