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采用熔体旋甩法结合放电等离子烧结技术(MS-SPS)制备了p型填充式方钴矿化合物Ce0.3Fe1.5Co2.5Sb12,研究了熔体旋甩工艺对微结构以及热电性能的影响规律.结果表明,较高的铜辊转速和较低的喷气压力有利于提高熔体的冷却速率,使带状产物晶粒细化.薄带经SPS烧结后得到致密、基本单相、晶粒尺寸均匀细小(150—300nm)的块体.与传统方法制备的试样相比,MS-SPS试样虽然电导率有所降低,但因具有较大的Seebeck系数而获得了相对较高的功率因子.更为重要的是,由于MS-SPS样品中的纳米结构,样品晶格热导率较传统方法制备的Ce0.3Fe1.5Co2.5Sb12降低约30%,因此MS-SPS工艺制备的试样的无量纲热电性能指数ZT与传统方法制备的样品相比有所提高,750K时达到0.55左右.
The p-type filled skutterudite compound Ce0.3Fe1.5Co2.5Sb12 was prepared by melt spinning method combined with spark plasma sintering (MS-SPS). The influence of melt spinning process on microstructure and thermoelectric properties was studied The results show that the higher copper roller speed and lower jet pressure are beneficial to increase the cooling rate of the melt and refine the grain size of the ribbon product.After SPS sintering, the strip is compact, the basic single phase, the grain size Uniform and small (150-300nm) blocks.Compared with the traditional method, the MS-SPS sample has lower electric conductivity, but has a larger Seebeck coefficient to obtain a relatively higher power factor More importantly, due to the nanostructures in the MS-SPS samples, the lattice thermal conductivity of the sample is reduced by about 30% compared to that of Ce0.3Fe1.5Co2.5Sb12 prepared by the conventional method. Therefore, the sample prepared by the MS-SPS process The dimensionless thermoelectric performance index ZT increased compared with the sample prepared by the traditional method, reaching about 0.55 at 750K.