Ceramic-Ceramic Composite Materials with Improved Friction and Wear Properties
Dry friction and wear tests were performed with self-mated couples of SiC with 50% TiC, Si3N4-BN, SiC-TiB2 and Si3N4 with 30 % TiN at room temperature and 400°C or 800°C.
Under room temperature conditions the friction coefficient of the couple SiC-TiC/SiC-TiC is only half of that of the couple SiC/SiC and the wear is one order of magnitude smaller. At 400°C it exceeds the friction coefficient of SiC/SiC except at the highest sliding velocity of 3 m/s. At lower sliding velocities the wear coefficient of SiC-TiC/SiC-TiC is lower than that of SiC/SiC.
The couple Si3N4-TiN/Si3N4-TiN exhibits high friction coefficients with all test conditions. At room temperature the wear volume of the self-mated couples of Si3N4 and Si3N4-TiN after a sliding distance of 1000 m is similar, but Si3N4-TiN shows a running-in behaviour. At 800°C the wear coefficient of Si3N4- TiN/Si3N4-TiN is approximately two orders of magnitude smaller than that of Si3N4/Si3N4 and equal to those at room temperature.
At 22°C the addition of BN reduces the friction of Si3N4. The wear coefficient is independent of sliding velocity and the selfmated couples showing running-in. Friction and wear increase with increasing temperature.
The wear coefficient of SiC-TiB2 above 0.5 m/s at 400°C is advantageously near 10-6 mm3/(Nm). With the other test conditions the wear behaviour is similiar to SSiC.
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