Tribophysical Properties of Polycrystalline Bulk Ti3AlC2


  • M. Barsoum—contributing editor

  • Supported by the 863 Program of China under Grant No. 2003AA332080, the National Science Foundation of China (NSFC) under Grant No. 50472045, and the Science Developing Foundation of Beijing Jiaotong University.

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A nearly pure, dense, polycrystalline bulk Ti3AlC2 sample was prepared by reactively hot pressing the element titanium, aluminum, and graphite powders. The tribophysical properties were investigated by sliding a Ti3AlC2 block dryly against a low-carbon steel disk. It was found that the friction coefficient is as low as ∼0.1, and the wear rate of Ti3AlC2 is only ∼2.5 × 10−6 mm3/N·m for the highest sliding speed of 60 m/s and the largest normal pressure of 0.8 MPa. These unusual properties are attributable to the presence of a compact self-generating film, which covers uniformly over the friction surface of Ti3AlC2 with a thickness of ∼0.5 μm.