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Controllable preparation method of P-type (Bi, Sb) 2Te3-based porous thermoelectric material
The invention discloses a controllable preparation method of a P-type (Bi, Sb) 2Te3-based porous thermoelectric material, and belongs to the technical field of thermoelectric materials. The invention particularly relates to the control of the structure and performance of the porous thermoelectric material. The preparation method comprises the following steps: weighing and mixing block (Bi, Sb) 2Te3, alkali chloride, sulfate, carbonate, nitrate and strong alkali powder according to a molar ratio of 1: 0-1: 2; the raw materials are subjected to particle refinement through ball milling, a mixed material obtained after ball milling is subjected to compression molding, synthesis is conducted on a two-sided top high-pressure press, the synthesis pressure ranges from 2 GPa to 5 GPa, and the temperature ranges from 500 K to 800 K; and carrying out ultrasonic cleaning and constant-temperature drying on the high-pressure synthesized block, and finally constructing a submicron and nano hole structure in the (Bi, Sb) 2Te3 matrix. The preparation method of the (Bi, Sb) 2Te3-based porous thermoelectric material provided by the invention has the advantages of simple and convenient process, high efficiency and cost saving, the porosity and aperture size of the porous material can be effectively regulated and controlled, the thermal conductivity of the material can be remarkably reduced, the thermoelectric performance of the porous material is effectively improved, and the optimal working temperature range of the thermoelectric material is expanded.
一种P型(Bi,Sb)2Te3基多孔热电材料的可控制备方法，属于热电材料技术领域。特别涉及到多孔热电材料的结构和性能的控制。本发明将块体(Bi,Sb)2Te3和碱金属氯化物，硫酸盐，碳酸盐，硝酸盐，强碱粉末分别按摩尔比为1:0～1:2进行称量混料；通过球磨对原料进行颗粒细化，将球磨后的混料模压成型并在两面顶高压压机进行合成，合成压力为2～5GPa，温度为500～800K；高压合成的块体经过超声波清洗，恒温烘干，最终在(Bi,Sb)2Te3基体中构造出亚微米和纳米孔洞结构。本发明提出的(Bi,Sb)2Te3基多孔热电材料制备方法具有工艺简便、高效、节省成本的优点，还可有效调控多孔材料的孔隙率和孔径尺寸，能够显著降低材料的热导率，有效提升多孔材料的热电性能，拓展热电材料的最佳工作温区。
Controllable preparation method of P-type (Bi, Sb) 2Te3-based porous thermoelectric material
The invention discloses a controllable preparation method of a P-type (Bi, Sb) 2Te3-based porous thermoelectric material, and belongs to the technical field of thermoelectric materials. The invention particularly relates to the control of the structure and performance of the porous thermoelectric material. The preparation method comprises the following steps: weighing and mixing block (Bi, Sb) 2Te3, alkali chloride, sulfate, carbonate, nitrate and strong alkali powder according to a molar ratio of 1: 0-1: 2; the raw materials are subjected to particle refinement through ball milling, a mixed material obtained after ball milling is subjected to compression molding, synthesis is conducted on a two-sided top high-pressure press, the synthesis pressure ranges from 2 GPa to 5 GPa, and the temperature ranges from 500 K to 800 K; and carrying out ultrasonic cleaning and constant-temperature drying on the high-pressure synthesized block, and finally constructing a submicron and nano hole structure in the (Bi, Sb) 2Te3 matrix. The preparation method of the (Bi, Sb) 2Te3-based porous thermoelectric material provided by the invention has the advantages of simple and convenient process, high efficiency and cost saving, the porosity and aperture size of the porous material can be effectively regulated and controlled, the thermal conductivity of the material can be remarkably reduced, the thermoelectric performance of the porous material is effectively improved, and the optimal working temperature range of the thermoelectric material is expanded.
一种P型(Bi,Sb)2Te3基多孔热电材料的可控制备方法，属于热电材料技术领域。特别涉及到多孔热电材料的结构和性能的控制。本发明将块体(Bi,Sb)2Te3和碱金属氯化物，硫酸盐，碳酸盐，硝酸盐，强碱粉末分别按摩尔比为1:0～1:2进行称量混料；通过球磨对原料进行颗粒细化，将球磨后的混料模压成型并在两面顶高压压机进行合成，合成压力为2～5GPa，温度为500～800K；高压合成的块体经过超声波清洗，恒温烘干，最终在(Bi,Sb)2Te3基体中构造出亚微米和纳米孔洞结构。本发明提出的(Bi,Sb)2Te3基多孔热电材料制备方法具有工艺简便、高效、节省成本的优点，还可有效调控多孔材料的孔隙率和孔径尺寸，能够显著降低材料的热导率，有效提升多孔材料的热电性能，拓展热电材料的最佳工作温区。
Controllable preparation method of P-type (Bi, Sb) 2Te3-based porous thermoelectric material
一种P型(Bi,Sb)2Te3基多孔热电材料的可控制备方法
DING ZHANHUI (Autor:in) / ZHAO HAO (Autor:in) / XUE YANFENG (Autor:in) / LI YONGFENG (Autor:in) / YAO BIN (Autor:in)
12.04.2022
Patent
Elektronische Ressource
Chinesisch
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