The effect of short carbon fibers on the thermoelectric and mechanical properties of p-type CeFe4Sb12 skutterudite composites
The effect of short carbon fibers on the thermoelectric and mechanical properties of p-type CeFe4Sb12 skutterudite composites
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DOI：
10.1016/j.matdes.2014.11.050
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发表时间：
2015-02
影响因子：
8.4
通讯作者：
S. Wan;Xiangyang Huang;P. Qiu;S. Bai;Lidong Chen
中科院分区：
文献类型：
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作者：
S. Wan;Xiangyang Huang;P. Qiu;S. Bai;Lidong Chen
采用熔融-退火结合放电等离子烧结工艺制备了短碳纤维增强的p型Skutterudite CeFe4Sb12复合材料，研究了碳纤维对复合材料热电性能和力学性能的影响，阐明了复合材料的微观结构与力学性能之间的关系。结果表明，碳纤维均匀分布于整个基体中，并与CeFe4Sb12颗粒紧密接触，没有中间层。碳纤维的加入提高了CeFe4Sb12的抗弯强度和断裂韧性。综合考虑材料的热电性能和力学性能，最佳的碳纤维含量为1%。当纤维体积分数为1%时，复合材料的弯曲强度提高了53%，而断裂韧性和ZT值基本不变。
Short carbon fiber-reinforced p-type skutterudite CeFe4Sb12composites were fabricated by a melting-annealing process combined with spark plasma sintering, the effect of carbon fibers on the thermoelectric and mechanical properties were investigated, and the relationship between the microstructure and the mechanical properties of the composites were elucidated. The results indicate that the carbon fibers were well distributed throughout the matrix and were in intimate contact with the CeFe4Sb12grains without interlayers. Both the flexural strength and the fracture toughness of CeFe4Sb12were enhanced with the addition of the carbon fibers. Considering the tradeoff between the thermoelectric and mechanical properties, the optimal carbon fiber content was found to be 1 vol.%. The flexural strength of the composite containing 1 vol.% fiber was improved by 53%, whereas the fracture toughness andZTvalue remained nearly unchanged.