High pressure method for preparing Bi-Te alloy series thermoelectric material
A technology of thermoelectric materials and alloys, which is applied in the field of high-voltage preparation of bismuth-tellurium alloy series thermoelectric materials, can solve the problems of high brittleness, low thermoelectric conversion efficiency, low strength, etc., and achieve good matching, high thermoelectric performance and machinability and work The effect of stability
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Embodiment 1
[0022] (1) Powder metal bismuth, antimony selenium and tellurium and dopant Bi or SbI are mixed according to the stoichiometric ratio 3 Put it into a nylon mixing tank and mix it by ball milling for 10 hours to fully mix it.
[0023] (2) The mixture obtained in the previous step was dried at 100°C for 10 hours, then cold-pressed at 20MPa, and then placed in a vacuum furnace at a constant temperature of 420°C for 4 hours in Ar gas, so that the raw materials could be fully reacted and synthesized.
[0024] (3) The above-mentioned synthesized samples are crushed by a vibrating crusher until the particle size is below 77 μm.
[0025] (4) The crushed product is cold-pressed at 20 MPa according to the size requirements of the ultra-high pressure mold.
[0026] (5) Put the molded product into a mold for ultra-high pressure sintering, and sinter at 410° C. for 2 minutes under 1.5 GPa.
Embodiment 2
[0028] (1) Powder metal bismuth, antimony selenium and tellurium and dopant Bi or SbI are mixed according to the stoichiometric ratio 3 Put it into a nylon mixing tank and mix it by ball milling for 10 hours to fully mix it.
[0029] (2) The mixture obtained in the previous step was dried at 100°C for 10 hours, then cold-pressed at 20MPa, and then placed in a vacuum furnace at a constant temperature of 460°C for 3 hours in Ar gas, so that the raw materials could be fully reacted and synthesized.
[0030] (3) The above-mentioned synthesized samples are crushed by a vibrating crusher until the particle size is below 77 μm.
[0031] (4) The crushed product is cold-pressed at 20 MPa according to the size requirements of the ultra-high pressure mold.
[0032] (5) Put the molded product into a mold for ultra-high pressure sintering, and sinter at 420° C. for 1.5 minutes under 3 GPa.
Embodiment 3
[0034] (1) Powder metal bismuth, antimony selenium and tellurium and dopant Bi or SbI are mixed according to the stoichiometric ratio 3 Put it into a nylon mixing tank and mix it by ball milling for 10 hours to fully mix it.
[0035] (2) The mixture obtained in the previous step was dried at 100°C for 10 hours, then cold-pressed at 20 MPa, and then placed in a vacuum furnace at a constant temperature of 500°C for 2 hours in Ar gas, so that the raw materials could be fully reacted and synthesized.
[0036] (3) The above-mentioned synthesized samples are crushed by a vibrating crusher until the particle size is below 77 μm.
[0037] (4) The crushed product is cold-pressed at 20 MPa according to the size requirements of the ultra-high pressure mold.
[0038] (5) Put the formed product into a mold for ultra-high pressure sintering, and sinter at 410° C. for 1 minute under 6 GPa.
[0039] The electrical conductivity, Seebeck coefficient, power factor, dimensionless figure of meri...
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Abstract
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