Abstract
An investigation was conducted on the possible beneficial synergistic effects of multiple additives in self-lubricating composites for use in high temperature friction and wear applications. The sliding friction and wear rates of NiAl based self-lubricating composites with different solid lubricant additions (PbO, Ti3SiC2–MoS2, Ti3SiC2–WS2) were obtained from room temperature to 800°C with a pin-on-disc configuration. Dry sliding wear tests against Si3N4 balls (the pin specimens) were run using a constant load of 10N and a constant speed of 0.2m/s. The results showed that the composites with Ti3SiC2–MoS2 exhibited excellent self-lubricating and anti-wear properties over a wide temperature range. MoS2 lubricated better at low temperatures, while Ti3SiC2 lubricated better at high temperatures. The Ti3SiC2–MoS2 binary lubricant presented the best synergetic lubricating effect of the three candidate compositions.
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