纳米复合方钴矿材料高温力学性能实验研究  

Experimental Investigation on Mechanical Properties of Nanocomposites Skutterudite at Different Temperature

作　　者：刘姿[1] 李瑶[1,2] 段波[1,2] 翟鹏程[1,2] 

机构地区：[1]武汉理工大学理学院,武汉430070 [2]武汉理工大学材料复合新技术国家重点实验室,武汉430070

出　　处：《武汉理工大学学报》2015年第8期1-5,共5页Journal of Wuhan University of Technology

基　　金：国家自然科学基金(11572050;51302205);武汉理工大学自主创新基金(155214007)

摘　　要：纳米复合能通过降低热导率有效提高方钴矿热电材料热电性能,也能有效增强其力学性能。介绍不同含量纳米复合方钴矿材料在不同温度下的弯曲强度,断裂韧性,分析其力学破坏机制。采用固相反应合成方钴矿CoSb3材料,结合超声分散,球磨技术和放电等离子烧结,以CoSb3为基体引入TiN纳米颗粒,制备TiN颗粒弥散分布的CoSb3＋x%TiN（体积分数x=0.0～1.0）材料。采用X射线衍射（XRD）、场发射扫描电镜（FESEM）技术对样品结构和形貌进行表征。对样品进行常温到500℃下的力学性能测试。结果表明,方钴矿破坏形式为脆性破坏,总体力学性能随纳米TiN复合含量的增加而增强,随温度的升高而降低。Nanoparticle can enhance the thermoelectric performance and mechanical properties of skutterudites compounds by decreasing thermal conductivity.The flexural strength and fracture toughness of skutterudites with different TiN contents at different temperatures were studied.Moreover,its destruction mechanisms were also discussed.Skutterudite compounds were synthesized by solid-state reaction.Nano-TiN dispersed skutterudite composites CoSb3＋x%TiN（x=0.0～1.0）were prepared by ultrasonic dispersion,ball milling methods and spark plasma sintering（SPS）technology.The samples＇ phase compositions and microstructure were characterized by power X-ray diffractometry（XRD）and field emmitted scanning electron microscopy（FESEM）.The mechanical properties were tested from room temperature to500℃.Brittle failure happened.It is shown that the increasing temperature can bring out weakness of mechanical properties of skutterudites,and the introduction of TiN particles can increase the service reliability of thermoelectric modules.

关 键 词：方钴矿 纳米复合 高温力学性能 

分 类 号：TB321[一般工业技术—材料科学与工程]