悬浮熔炼制备Half-Heusler合金Zr1-xTixNiSn0.975Sb0.025及其热电性能

采用悬浮熔炼法合成了Zr1-xTixNiSn0.975Sb0.025(x = 0, 0.15, 0.25, 0.5)基Half-Heusler热电材料,X射线衍射结果表明所制备合金为单相.相对于常规方法,悬浮熔炼显著缩短了制备Half-Heusler合金的时间.同时研究了Ti取代及不同热压条件对材料热电性能的影响.结果表明:ZrNiSn0.975Sb0.025合金进行A位取代可降低材料的热导率,而不会明显影响其热电性能.致密度可以影响材料的热电性能,适当的热压条件可以使合金的ZT值达到最大,约为0.45.

Suspension Melting Preparation of Zr1-xTixNiSn0.975Sb0.025 Half-Heusler Alloy and Its Thermoelectric Properties

Zr1-xTixNiSn0.975Sb0.025 (x=0, 0.15, 0.25, 0.5) based Half-Heusler thermoelectric materials were synthesized by suspension melting. X-ray diffraction results show that the obtained alloy was single phase compound. Compared with conventional melting methods, the suspension melting markedly reduced the preparation duration. Meanwhile the effects of Ti substitution and different hot-pressing conditions on thermoelectric properties of the materials were also studied. Results show that the Ti substitution for the A site of ZrNiSn0.975Sb0.025 can reduce the thermal conductivity but does not affect its thermoelectric properties obviously. The density can affect the thermoelectric properties. Proper hot-pressing condition can make ZT values reach the maximum of about 0.45.