THE EFFECT OF SOLID LUBRICANTS ON THE TRIBOLOGICAL BEHAVIOUR OF ZIRCONIA AT HIGH TEMPERATURES UP TO 600 DEGREES-C

摘要

The tribological properties of TZP ceramics under solid lubrication up to 600 degrees C have been investigated in this paper. The use either of graphite or of MoS2 can reduce the friction coefficient and rate of wearing of TZP/Si3N4 sliding couples from 25 to 600 degrees C. However, their lubricating characteristics can deteriorate due to the oxidation of these lubricants at excessively high temperatures. Using CeO2 and Cu can reduce the rate of wearing of TZP ceramics, but they have no apparent influence on the friction coefficient. CeF3 exhibits good lubricating properties above 400 degrees C, which is due to its complete crystallization and orientation along the (002) plane. [References: 17]