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Preparation method of bismuth telluride thermoelectric material containing graphene
The invention provides a preparation method of a graphene-containing bismuth telluride thermoelectric material, which comprises the following steps: adding graphene into bismuth telluride alloy powder, carrying out ball milling and uniform mixing, carrying out vacuum pressure sintering to obtain a block material, and carrying out variable-diameter hot extrusion to obtain a graphene-containing bismuth telluride thermoelectric rod. By doping the graphene material, an additional transmission channel can be provided for current carriers, the current carrier mobility of the material is improved, and the electrical property is optimized; the size of the material can be effectively reduced, the scattering of phonons is enhanced, and the lattice thermal conductivity of the bismuth telluride-based thermoelectric material is reduced; the mechanical property of the bismuth telluride-based material can be effectively improved. Meanwhile, high-energy ball milling, vacuum hot pressing sintering and variable-diameter hot extrusion processes are combined, under comprehensive regulation and control of electrical, thermal and mechanical properties, the thermoelectric figure of merit (ZT) of the bismuth telluride-based thermoelectric material is greatly improved, the mechanical properties of the bismuth telluride-based thermoelectric material are greatly optimized, and the application prospect of the bismuth telluride-based thermoelectric material is effectively widened through collaborative optimization.
本发明提供了一种含石墨烯的碲化铋热电材料的制备方法，将石墨烯添加至碲化铋合金粉末中，球磨混合均匀后经真空加压烧结成块体材料，然后经变径热挤压得到含石墨烯的碲化铋热电棒材。通过石墨烯材料的掺入，能够为载流子提供额外的传输通道，提高材料的载流子迁移率，优化电学性能；能够有效降低材料的尺寸，增强对声子的散射，降低碲化铋基热电材料的晶格热导率；能够有效提高碲化铋基材料的力学性能。同时采用高能球磨、真空热压烧结和变径热挤压工艺相结合，在电、热和力学性能综合调控下，该碲化铋基热电材料热电优值(ZT)得到较大提高，其力学性能得到大幅度优化，这些协同优化有效拓宽了碲化铋热电材料的应用前景。
Preparation method of bismuth telluride thermoelectric material containing graphene
The invention provides a preparation method of a graphene-containing bismuth telluride thermoelectric material, which comprises the following steps: adding graphene into bismuth telluride alloy powder, carrying out ball milling and uniform mixing, carrying out vacuum pressure sintering to obtain a block material, and carrying out variable-diameter hot extrusion to obtain a graphene-containing bismuth telluride thermoelectric rod. By doping the graphene material, an additional transmission channel can be provided for current carriers, the current carrier mobility of the material is improved, and the electrical property is optimized; the size of the material can be effectively reduced, the scattering of phonons is enhanced, and the lattice thermal conductivity of the bismuth telluride-based thermoelectric material is reduced; the mechanical property of the bismuth telluride-based material can be effectively improved. Meanwhile, high-energy ball milling, vacuum hot pressing sintering and variable-diameter hot extrusion processes are combined, under comprehensive regulation and control of electrical, thermal and mechanical properties, the thermoelectric figure of merit (ZT) of the bismuth telluride-based thermoelectric material is greatly improved, the mechanical properties of the bismuth telluride-based thermoelectric material are greatly optimized, and the application prospect of the bismuth telluride-based thermoelectric material is effectively widened through collaborative optimization.
本发明提供了一种含石墨烯的碲化铋热电材料的制备方法，将石墨烯添加至碲化铋合金粉末中，球磨混合均匀后经真空加压烧结成块体材料，然后经变径热挤压得到含石墨烯的碲化铋热电棒材。通过石墨烯材料的掺入，能够为载流子提供额外的传输通道，提高材料的载流子迁移率，优化电学性能；能够有效降低材料的尺寸，增强对声子的散射，降低碲化铋基热电材料的晶格热导率；能够有效提高碲化铋基材料的力学性能。同时采用高能球磨、真空热压烧结和变径热挤压工艺相结合，在电、热和力学性能综合调控下，该碲化铋基热电材料热电优值(ZT)得到较大提高，其力学性能得到大幅度优化，这些协同优化有效拓宽了碲化铋热电材料的应用前景。
Preparation method of bismuth telluride thermoelectric material containing graphene
含石墨烯的碲化铋热电材料的制备方法
ZHOU SHUAI (author) / HE XIANHAN (author) / WU YANQING (author)
2024-03-29
Patent
Electronic Resource
Chinese
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