February 2010

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Applied Technology

Progress Made in Friction and Wear of Ti3SiC2

A study by researchers from the State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, CAS on the friction and wear of thermal oxidation-treated Ti3SiC2 showed that thermal oxidation-treated Ti3SiC2 has excellent friction and wear properties. Ti3SiC2 was thermally oxidized under 1000 for 10 hours and an oxide scale about 25m thick was formed, which was composed of two sub-layers with different composition and microstructure. The micro-hardness of thermal oxidation-treated Ti3SiC2 reached as high as 10.28GPa. The tribological behavior of Ti3SiC2 and thermal oxidation-treated Ti3SiC2 sliding against Si3N4 at 25 and 600 C was investigated. Results indicated that at both 25 and 600 C, the tribological behavior of thermal oxidation-treated Ti3SiC2 is better than that of Ti3SiC2. Researchers found that the tribological behavior of thermal oxidation-treated Ti3SiC2 is controlled by two competing wear mechanisms, which are the fracture and spalling of Ti3SiC2 grains and friction-induced oxidation. The oxide scale formed after thermal oxidation significantly improved the tribological performance of Ti3SiC2. This research result was published in Tibol. Lett. (Tribol. Lett. (2010) 37:59C67recently.

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