高择优取向P型Bi_(2)Te_(3)基材料制备及性能  

Preparation and properties of P-type Bi_(2)Te_(3)-based materials with high preferred orientation

作　　者：苏紫珊 蔡新志 熊平尚 童培云 朱刘 SU Zishan;CAI Xinzhi;XIONG Pingshang;TONG Peiyun;ZHU Liu(Vital Thin Film Materials(Guangdong)Co.,Ltd.,Qingyuan 511517,China;National Engineering and Technology Research Center for Rare Metals of Guangdong Vital Material Co.,Ltd.,Qingyuan 511517,China)

机构地区：[1]先导薄膜材料(广东)有限公司,清远511517 [2]广东先导稀材股份有限公司国家稀散金属工程技术研究中心,清远511517

出　　处：《粉末冶金技术》2025年第1期79-85,共7页Powder Metallurgy Technology

摘　　要：以Bi_(0.4)Sb_(1.6)Te_(3)+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Bi_(2)Te_(3)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Bi_(2)Te_(3)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44.5μW·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Bi_(2)Te_(3)基热电材料制备提供了方向。Using the Bi_(0.4)Sb_(1.6)Te_(3)+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 Bi_(2)Te_(3)-based alloy powders were obtained by grinding and sieving the alloy ingots with hammer.The P-type Bi_(2)Te_(3)-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 44.5μW·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 Bi_(2)Te_(3)-based thermoelectric materials.

关 键 词：Bi_(2)Te_(3) 择优取向 磁悬浮熔炼 水冷铜 热电材料 

分 类 号：TF125[冶金工程—粉末冶金] TB34[冶金工程—冶金物理化学]