CoSb_3/BN复合材料的制备和性能

Preparation and properties of CoSb_3/BN composite material

利用固相反应和SPS(放电等离子体烧结)技术烧结了CoSb3+BN块体材料。X射线衍射(XRD)测试表明,两者没有发生固溶或者化学反应,成功制备了CoSb3/BN复合材料。扫描电子显微镜(SEM)表征发现BN(氮化硼)均匀地分散在CoSb3基体中。测试了复合材料的电导率和热导率随温度的变化。在室温时BN的引入同时降低了电导率和热导率,而在高温时,对电导率的影响减弱,但仍然有效地降低晶格热导率。

CoSb3/BN composite materials were prepared by solidstate reaction and spark plasma sintering(SPS) processes. The constituent phases of the samples were determined by XRD. The SEM observation shows that BN particle disperses in CoSb3 matrix uniformly. The thermal conductivity and electrical conductivity of the composite material in the temperature range from 300 K to 800 K were measured. The results show that both the thermal conductivity and electrical conductivity are decreased by the introduction of BN at room temperature. However, at high temperature, the effect of BN on electrical conductivity is weak whereas that on decreasing lattice thermal conductivity is still great. The effect of particle distribution on properties of skutterudites is also discussed.