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研究了TiNiSn基Half-Heusler热电化合物的机械合金化(MA)结合放电等离子体烧结(SPS)制备工艺。实验以Ti、Ni、Sn单质粉末为原料,研究了MA和SPS过程中的化学反应与相组成的变化以及所制备的块体材料的电学性能,获得以下主要结果:(1)MA处理后的粉末经过SPS固化后可转变为TiNiSn化合物,但是MA难以直接合成TiNiSn化合物粉末,其原因在于Ni和Sn在球磨过程中较容易生成化合物Ni3Sn4;(2)优化MA时间和适量增加Ti的含量有利于提高SPS样品中的TiNiSn化合物含量,本研究获得的TiNiSn相纯度高达90%;(3)最佳条件下制备的TiNiSn化合物块体材料呈n型,测试范围内其功率因子最高可达到1380μW/m.K2。
The preparation of TiNiSn based Half-Heusler thermoelectric compounds by mechanical alloying (MA) combined with spark plasma sintering (SPS) was studied. In the experiment, the chemical reaction and the phase composition in the MA and SPS process and the electrical properties of the prepared bulk materials were studied using Ti, Ni and Sn as the raw materials. The main results are as follows: (1) However, it is difficult for MA to synthesize TiNiSn compound powders directly. The reason is that it is easier for Ni and Sn to form compound Ni3Sn4 during ball milling. (2) Optimizing MA time and increasing Ti content are favorable The content of TiNiSn in SPS samples was increased, and the purity of TiNiSn phase in this study was as high as 90%. (3) The bulk material of TiNiSn prepared under optimal conditions was n-type, and the maximum power factor was 1380μW / m .K2.