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采用熔体旋甩(MS)结合放电等离子体烧结法(SPS),制备了具有层状纳米结构的n型Bi2Te3基热电材料。对薄带和SPS烧结后块体材料的相组成和微结构进行了分析和表征,在300—420 K的温度范围内测量了电导率(σ)和Seebeck系数(α)。结果表明:得到的带状产物接触面是等轴状晶粒而自由面是枝状晶,铜辊转速从10 m/s增加到30 m/s时带状产物接触面和自由面的等轴状及枝状晶的尺寸明显减小,烧结块体的晶粒尺寸及层状厚度也明显减小,材料功率因子在300 K从1.7×10-3W/(mK2)增大到了3.1×10-3W/(mK2)。
An n-type Bi2Te3-based thermoelectric material with layered nanostructures was prepared by melt spinning (MS) combined with spark plasma sintering (SPS). The phase composition and microstructure of the bulk material after ribbon and SPS sintering were analyzed and characterized. Conductivity (σ) and Seebeck coefficient (α) were measured over the temperature range of 300-420 K. The results show that the contact surface of the ribbon product is equiaxed and the free surface is dendritic. When the rotation speed of copper roller increases from 10 m / s to 30 m / s, the equiaxed And the size of dendrites decreased obviously, while the grain size and the thickness of lamellae decreased obviously. The power factor increased from 1.7 × 10-3W / (mK2) to 3.1 × 10-3W / (mK2).