Cu1.8S-based polycrystalline block thermoelectric material and preparation method thereof
A thermoelectric material, cu1.8s technology, applied in thermoelectric device node lead-out materials, nanotechnology for materials and surface science, nanotechnology, etc., can solve problems such as reducing thermal conductivity and reducing electrical conductivity of matrix materials , to achieve the effect of reducing thermal conductivity, maintaining grain morphology, and improving thermoelectric performance
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[0024] Cu according to the present invention 1.8 The preparation method of S-based polycrystalline bulk thermoelectric material comprises the following steps:
[0025] 1) Preparation of Cu using mechanical alloying method 1.8 For S powder, first weigh Cu and S elemental powder respectively according to the stoichiometric ratio. Under a protective atmosphere, perform ball milling to prepare Cu 1.8 S powder, then add formula ratio X 2 Y 3 Powders are mixed;
[0026] 2) Place the mixed powder in a graphite mold to prepare Cu by spark plasma sintering 1.8 S-based polycrystalline bulk thermoelectric materials.
[0027] The purity of the Cu and S elements described in step (1) is >99.5%, and the protective atmosphere is 5% H 2 +95% Ar, the ball-to-material ratio of the ball milling process is 20~50:1, the speed is 300~450rpm, and the ball milling time is 1~6 h.
[0028] The mixing described in step (1) is manual grinding, ball milling or ultrasonic dispersion.
[0029] The s...
Embodiment 1
[0031] The present invention Cu 1.8 S+1wt%In 2 S 3 Preparation method and performance characterization of polycrystalline bulk thermoelectric materials.
[0032] 1. Powder preparation
[0033] According to the stoichiometric ratio, 4g of Cu elemental powder and 1.12g of S elemental powder with a purity>99.5% were weighed respectively; 2 Under the protection of the atmosphere of +95% Ar, according to the ball-to-material ratio of 20:1, the rotation speed was controlled at 450 rpm, and the ball milling time was 3h, Cu 1.8 S powder. Weigh the In prepared by solid phase sintering method 2 S 3 Powder 0.0512g, and with Cu 1.8 The S powders were mixed and ground for 30 minutes by hand to obtain a mixed powder.
[0034] 2. Preparation of bulk materials
[0035] Pour the powder prepared in step 1 into a graphite mold with a diameter of 15mm, and sinter at 450°C for 5min under a pressure of 50MPa.
[0036] 3. Characterization of thermoelectric properties
[0037] The block ob...
Embodiment 2
[0039] The present invention Cu 1.8 S+2wt%In 2 S 3 Preparation method and performance characterization of polycrystalline bulk thermoelectric materials.
[0040] 1. Powder preparation
[0041] According to the stoichiometric ratio, 4g of Cu elemental powder and 1.12g of S elemental powder with a purity>99.5% were weighed respectively; 2 Under the protection of the atmosphere of +95% Ar, according to the ball-to-material ratio of 20:1, the rotation speed was controlled at 450 rpm, and the ball milling time was 3h, Cu 1.8 S powder. Weigh the In prepared by solid phase sintering method 2 S 3 Powder 0.1024g, and with Cu 1.8 The S powders were mixed and ground for 30 minutes by hand to obtain a mixed powder.
[0042] 2. Preparation of bulk materials
[0043] Pour the powder prepared in step 1 into a graphite mold with a diameter of 15mm, and sinter at 450°C for 5min under a pressure of 50MPa.
[0044] 3. Characterization of thermoelectric properties
[0045] The block ob...
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