Low-temperature Solid-state Synthesis of Nanometer TiB2-TiC Composite Powder

TiB2-TiC composite powders were prepared at low temperature in the Ti-B system with the PTFE polytetra- fluoroethylene (polytetrafluoroethylene) as a chemical activator. Reaction temperature, phase composition and mor- phology were measured via differential thermal analysis, X-ray diffraction and field emission scanning electron mi- croscopy (FESEM) in order to explore the reaction mechanism, respectively. Actual solid-state reaction synthesis ex- periments were carried out for the same composition in an argon atmosphere furnace. It was found that TiB2-TiC composite powder could be synthesized successfully at 550℃ by adding 10wt% PTFE into the initial reactant Ti-B mixture. The FESEM image showed that the average size of the product was smaller than 400 nm. According to dif- ferential thermal analysis results, the combustion synthesis mainly includes two reaction processes: firstly, the initial reaction between titanium and PTFE particles resulting in great amounts of heat release; subsequently, the released en- ergy triggers the solid-state reaction between titanium and boron particles to form TiB2.

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