Preparation and properties of P-type Bi2Te3-based materials with high preferred orientation
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摘要:
以Bi0.4Sb1.6Te3+3%Te（质量分数）熔炼晶棒为原料，利用水冷铜坩埚磁悬浮熔炼技术制备出取向性非常好的合金铸锭，将合金铸锭锤磨破碎筛分，得到P型Bi2Te3基合金粉体，采用真空热压烧结技术制备沿（00l）晶面择优取向的P型Bi2Te3基热电材料，研究铸锭、合金粉体和热压烧结块体的微观形貌和择优取向，以及粉体粒径对烧结块体电性能的影响。结果表明，经过急冷破碎筛分后的粉体沿（00l）晶面具有高择优取向。使用100～200目粒度的粉体在500 ℃、40 MPa烧结条件下制备样品，其功率因子达到44.5 μW·cm−1·K−2，可切割厚度为0.3 mm的薄片，合格率超过90%。与区熔N型匹配常规127对4 cm×4 cm半导体致冷器，型号为TEC1-
12706 器件的最大温差可达70 ℃，为高性能Bi2Te3基热电材料制备提供了方向。Abstract:Using the Bi0.4Sb1.6Te3+3%Te (mass fraction) melting crystal rods as the raw materials, the alloy ingots with good orientation were prepared by water-cooled copper crucible maglev melting technology. The P-type Bi2Te3-based alloy powders were obtained by grinding and sieving the alloy ingots with hammer. The P-type Bi2Te3-based thermoelectric materials with the preferred orientation along the (00l) crystal face were prepared by vacuum hot pressing sintering technology. The micro-morphology and preferred orientation of the ingots, alloy powders and hot pressed sintered blocks were studied, as well as the effect of particle size on the electrical properties of the sintered blocks. The results show that the powders after quenching, crushing, and screening are highly oriented along the (00l) crystal face. The blocks prepared by using 100~200 mesh size powders sintered at 500 ℃ and 40 MPa have the power factor of 44.5 μW·cm−1·K−2, which can cut the thin slices with the thickness of 0.3 mm, with the pass rate of more than 90%. Matching the conventional 127 pair 4 cm×4 cm thermoelectric cooler (TEC) with the zone melting N-type, the maximum temperature difference of the model TEC1-
12706 devices can reach 70 ℃, providing the preparation direction of the high-performance Bi2Te3-based thermoelectric materials. -
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图 3 不同粒径粉体的粒度分布
Figure 3. Particle size distribution of the powders in different particle size
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图 4 不同粒径粉体样品的显微形貌：（a）100～200目；（b）200～325目；（c）325目筛下物；（d）100目筛下物
Figure 4. SEM images of the powders in different particle size: (a) 100～200 mesh; (b) 200～325 mesh; (c) under 325 mesh screen; (d) under 100 mesh screen
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图 7 不同粒径粉体的烧结块体断口形貌：（a）100～200目；（b）200～325目；（c）325目筛下物；（d）100目筛下物
Figure 7. Fracture morphology of the sintered billets prepared by the powders in different particle size: (a) 100～200 mesh; (b) 200～325 mesh; (c) under 325 mesh screen; (d) under 100 mesh screen
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图 8 烧结块体样品的电学性能：（a）电导率；（b）Seebeck系数；（c）功率因子
Figure 8. Electrical properties of the sintered bulk samples: (a) electrical conductivity; (b) Seebeck coefficient; (c) powder factor
表 1 不同粒径粉体沿（00l）方向的取向因子
Table 1 Orientation factor of the powders in different particle size along (00l) direction
样品 取向因子，F 100目筛下物 0.15 100～200目 0.35 200～325目 0.45 325目筛下物 0.13 
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表 2 烧结块体样品沿（00l）方向的取向因子
Table 2 Orientation factor of the sintered billets along (00l) direction
样品 取向因子，F 100目筛下物 0.26 100～200目 0.28 200～325目 0.30 325目筛下物 0.45
下载: 导出CSV
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