Preparation of a TiB 2 –ZrB 2 composite assisted by mechanical alloying

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Abstract

A TiB 2 –ZrB 2 composite was synthesized by 20-h mechanical alloying (MA) of a mixture of Zr, Ti, and B powders in a planetary ball mill (Zr:Ti:B molar ratio = 1:1:4; ball-to-powder weight ratio = 20:1). Milling was performed at 500 rpm in an argon atmosphere using a ZrO 2 vial and balls and was followed by pressureless sintering at 1230 °C. The effect of milling time on MA-induced phase changes was investigated by X-ray diffraction, and the microstructure development of powder mixtures and the TiB 2 –ZrB 2 composite was monitored by field emission scanning electron microscopy and transmission electron microscopy. MA reduced the activation energy for the transformation of the above powder mixture, allowing its complete conversion into TiB 2 and ZrB 2 at 1230 °C. Cold processing and sintering produced relatively dense TiB 2 –ZrB 2 composites wherein ZrB 2 was dispersed in the TiB 2 matrix.

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Luo, P., Xiong, C., Xiao, Y., Li, Z., Qin, F., Wang, C., … Dong, S. (2017). Preparation of a TiB 2 –ZrB 2 composite assisted by mechanical alloying. Journal of Asian Ceramic Societies, 5(4), 397–401. https://doi.org/10.1016/j.jascer.2017.08.004

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