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

doi:10.15541/jim20150524

Abstract

Abstract:

TiB₂-TiC composite powders were prepared at low temperature in the Ti-B system with the PTFE polytetrafluoroethylene (polytetrafluoroethylene) as a chemical activator. Reaction temperature, phase composition and morphology were measured via differential thermal analysis, X-ray diffraction and field emission scanning electron microscopy (FESEM) in order to explore the reaction mechanism, respectively. Actual solid-state reaction synthesis experiments 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 differential 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 energy triggers the solid-state reaction between titanium and boron particles to form TiB₂.

Key words: TiB₂-TiC, solid-state synthesis, PTFE, reaction mechanism

CLC Number:

TQ174

YU Yin-Hu, WANG Tao, LIAO Qiu-Ping, MIAO Run-Jie, PAN Jian-Feng, ZHANG Du-Bao. Low-temperature Solid-state Synthesis of Nanometer TiB₂-TiC Composite Powder[J]. Journal of Inorganic Materials, 2016, 31(3): 324-328.

Figures/Tables 5

Fig. 1 DTA curves of the Ti-B mixtures with (a) 0wt%, (b) 1wt%, (c) 3wt%, (d) 5wt%, (e) 8wt%, (f) 10wt%, and (g) 12wt% PTFE

Fig. 2 XRD patterns of the Ti-B mixtures with (a) 0wt%, (b) 1wt%, (c) 3wt%, (d) 5wt%, (e) 8wt%, (f) 10wt%, and (g) 12wt% PTFE after reactions in argon atmosphere at 550℃

Fig. 3 XRD patterns of the Ti-B mixtures with (a) 0wt%, (b) 1wt%, (c) 3wt%, (d) 5wt%, (e) 8wt%, (f) 10wt%, and (g) 12wt% PTFE after reactions in argon atmosphere at 1300℃

Fig. 4 Morphologies and EDS results of the product of Ti-B system with (a) 10wt% PTFE and (b) 12wt% after reactions in argon atmosphere at 550℃

Fig. 5 DTA curves of (a) PTFE, (b) B-PTFE and (c) Ti-PTFE at a heating rate of 10℃/min in argon atmosphere

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

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