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Preparation method of bismuth telluride-based thermoelectric material
The invention relates to the technical field of thermoelectric material preparation, in particular to a preparation method of a bismuth telluride-based thermoelectric material. The preparation method includes the following steps: mixing three simple substance raw materials of Sb, Bi and Te, performing vacuum melting to obtain an alloy ingot, crushing the mixture, and performing ball milling to obtain bismuth telluride-based powder; then performing spark plasma sintering on the bismuth telluride-based powder to obtain a bismuth telluride-based block material; and pressing the bismuth telluride-based block material in an equal channel angular extrusion die to obtain the bismuth telluride-based thermoelectric material. According to the invention, the bismuth telluride-based material is prepared by using vacuum melting, ball milling and spark plasma sintering methods, then the bismuth telluride-based material is subjected to secondary processing through an equal channel angular extrusion process; and finally, the material is greatly deformed and the internal structure of the material is changed through multi-pass extrusion operation, so that the electrical properties of the material are further optimized.
本发明涉及热电材料制备技术领域，具体涉及一种碲化铋基热电材料的制备方法；包括以下步骤：将Sb、Bi和Te三种单质原料混合后经真空熔融得到合金铸锭后破碎、球磨得到碲化铋基粉末；碲化铋基粉末经过放电等离子烧结得到碲化铋基块体材料；碲化铋基块体材料置于等径角挤压模具中挤压得到碲化铋基热电材料；本发明利用真空熔融、球磨和放电等离子烧结法制得碲化铋基材料，之后通过等径角挤压工艺对其进行二次加工，通过进行多道次的挤压操作，使材料产生大量形变，改变其内部结构，从而进一步优化其电学性能。
Preparation method of bismuth telluride-based thermoelectric material
The invention relates to the technical field of thermoelectric material preparation, in particular to a preparation method of a bismuth telluride-based thermoelectric material. The preparation method includes the following steps: mixing three simple substance raw materials of Sb, Bi and Te, performing vacuum melting to obtain an alloy ingot, crushing the mixture, and performing ball milling to obtain bismuth telluride-based powder; then performing spark plasma sintering on the bismuth telluride-based powder to obtain a bismuth telluride-based block material; and pressing the bismuth telluride-based block material in an equal channel angular extrusion die to obtain the bismuth telluride-based thermoelectric material. According to the invention, the bismuth telluride-based material is prepared by using vacuum melting, ball milling and spark plasma sintering methods, then the bismuth telluride-based material is subjected to secondary processing through an equal channel angular extrusion process; and finally, the material is greatly deformed and the internal structure of the material is changed through multi-pass extrusion operation, so that the electrical properties of the material are further optimized.
本发明涉及热电材料制备技术领域，具体涉及一种碲化铋基热电材料的制备方法；包括以下步骤：将Sb、Bi和Te三种单质原料混合后经真空熔融得到合金铸锭后破碎、球磨得到碲化铋基粉末；碲化铋基粉末经过放电等离子烧结得到碲化铋基块体材料；碲化铋基块体材料置于等径角挤压模具中挤压得到碲化铋基热电材料；本发明利用真空熔融、球磨和放电等离子烧结法制得碲化铋基材料，之后通过等径角挤压工艺对其进行二次加工，通过进行多道次的挤压操作，使材料产生大量形变，改变其内部结构，从而进一步优化其电学性能。
Preparation method of bismuth telluride-based thermoelectric material
一种碲化铋基热电材料的制备方法
LI RUSONG (author) / KONG DONG (author) / KUANG ZHIXIANG (author) / XU CHENHUI (author)
2021-12-03
Patent
Electronic Resource
Chinese
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