Sleeve forging and pressing preparation method of bismuth-telluride-base thermoelectric material

The invention relates to a sleeve forging and pressing preparation method of a bismuth-telluride-base thermoelectric material, which comprises the following steps: (1) material preparation: smelting raw materials to obtain a bismuth telluride base block material, pulverizing, grinding and screening to obtain powder; (2) sleeve filling: filling the powder into an aluminum sleeve, putting the aluminum sleeve in a cold-press die, and compacting the powder with a pressing machine to obtain a block blank; (3) presintering: heating to 300-580 DEG C, and keeping the temperature for 3 minutes to 1 hour; (4) forging and pressing: forging the bismuth telluride base block alloy thermoelectric material with the aluminum sleeve under the forging and pressing pressure of 20-900MPa until the die cavity is fully filled, and maintaining or not maintaining the pressure; and (5) sleeve removal: removing the aluminum sleeve to obtain the required bismuth telluride base block thermoelectric material. The invention has the followi