论文部分内容阅读
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。
Nanocomposite can effectively improve the thermoelectric properties of the cubic cobaltite thermoelectric material by reducing the thermal conductivity and also can effectively enhance its mechanical properties. The flexural strength and fracture toughness of nanocomposite skutterudites at different temperatures are introduced and their mechanical failure mechanisms are analyzed. CoSb3 + x% TiN (volume fraction x = 0.0-1.0) was prepared by solid-state reaction of cobaltite CoSb3 with ultrasonic dispersion, ball milling and spark plasma sintering. TiN nanoparticles were introduced with CoSb3 as matrix )material. The structure and morphology of the samples were characterized by X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM). The samples were tested at room temperature to 500 ℃ mechanical properties. The results show that the failure mode of the cobaltite is brittle failure, and the overall mechanical properties increase with the increase of the content of nano-TiN composite, and decrease with the increase of the temperature.