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以单质Sb,Te粉末为原材料,采用真空电弧等离子体蒸发法对原材料进行加热、蒸发、气化并在收集体表面进行化学反应形成粉末,从而合成Sb2Te3热电粉末材料。研究了电弧电流和氩气压力对合成Sb2Te3热电粉末材料的平均粒径和生产率的影响,并通过场发射扫描电镜表征了Sb2Te3热电粉末材料的微观结构。结果表明,在100～175 A,随着电弧电流增大,粉末的平均粒径和生产率增加。在2～8 kPa的氩气压力下,随着气体压力增大,粉末的平均粒径和生产率增大,粉末团聚较明显。
Using Sb and Te powders as raw materials, the raw materials are heated, evaporated and gasified by the vacuum arc plasma evaporation method to form powders by the chemical reaction on the surface of the collected materials to synthesize Sb2Te3 thermoelectric powder materials. The effects of arc current and argon pressure on the average particle size and productivity of Sb2Te3 thermoelectric powder were investigated. The microstructure of Sb2Te3 thermoelectric powder was characterized by field emission scanning electron microscopy. The results show that at 100-175 A, the average particle size and productivity increase with the increase of arc current. Under the argon pressure of 2 ~ 8 kPa, with the increase of gas pressure, the average particle size and productivity of the powder increase, the powder agglomeration is more obvious.