Synthesis of Ti3AlC2 Powders Using Sn as an Additive


  • R. Koc—contributing editor

  • Supported by “863” program under Grant no. 2003AA332080, the National Science Foundation of China (NSFC) under Grant no. 50472045, and the Science Developing Foundation of BJTU.

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Nearly pure Ti3AlC2 powders have been synthesized by calcining a mixture of titanium, aluminum, and graphite powders using tin powders as additives. Four recipes with different mole ratios of Ti:Al:C:Sn were examined at calcining temperatures from 1300° to 1500°C. The addition of Sn effectively inhibited the generation of thermal explosion when the volume of the starting materials is larger, and considerably reduced the lower-limit calcining temperature. The nearly pure Ti3AlC2 powders can be obtained reliably on a large scale by calcining the starting materials with a mole ratio of 3Ti:1Al:1.8C:0.2Sn at temperatures from 1350° to 1500°C.