Thermoelectric element, preparation method of thereof, and thermoelectric device
A thermoelectric element and thermoelectric layer technology, applied in the manufacture/processing of thermoelectric devices, thermoelectric device node lead-out materials, etc., can solve the problems of thermoelectric material matrix and barrier layer diffusion, thermoelectric device performance degradation, and affect the performance of thermoelectric materials , to achieve the effect of maintaining thermoelectric conversion efficiency and stability, high thermal conductivity and electrical conductivity, and improving service life
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[0047] Example 1
[0048] Step 1: Follow Mg 2 Ge 0.25 Sn 0.73 Bi 0.02 Measure each metal source (accurate to 4 decimal places) according to the stoichiometric ratio, weigh the elemental elements required by the thermoelectric material into a graphite crucible, put the graphite crucible into a quartz tube, and then evacuate to 5×10 -3 Mpa, filled with protective gas argon, and then began to smelt the sample at a current of 220A until each metal source material melted into a liquid state. In order to ensure uniform smelting, after melting into a liquid state, continue to maintain the current at 250A for 1 min until a vortex is formed, then perform water cooling, and then seal the smelted sample. The ingot is placed in a vacuum quartz tube for annealing; the annealing temperature is 550°C and the time is 24h. The sample was then quenched with liquid nitrogen, and the bulk sample was manually ground into powder in a mortar to obtain Mg 2 Ge 0.25 Sn 0.73 Bi 0.02 Thermoelec...
Example Embodiment
[0050] Example 2
[0051] Mg is sequentially charged into the graphite mold 2 Ge 0.25 Sn 0.75 Powder, aluminum alloy bulk (containing 1% nickel), copper-nickel mixed powder, according to Mg 2 Ge 0.25 Sn 0.75 The powder, the aluminum alloy block, and the copper-nickel mixed powder are sequentially loaded into the graphite mold. The vacuum degree is 1.3×10 -3 MPa, the sintering pressure is 27Mpa, and the temperature is raised to 430°C at a rate of 35°C / min for SPS hot pressing sintering for 10min, thereby producing a thermoelectric element. The thermoelectric element has Mg 2 Ge 0.25 Sn 0.75 Thermoelectric layer, aluminum alloy barrier layer and copper-nickel electrode layer. Mg was found after testing 2 Ge 0.25 Sn 0.75 The thickness of the thermoelectric layer is 8 mm, the thickness of the aluminum alloy barrier layer is 0.15 mm, and the thickness of the copper-nickel electrode layer is 1 mm, and there is no crack or obvious diffusion between the interfaces.
Example Embodiment
[0052] Example 3
[0053] The silicon-germanium alloy block, aluminum flakes, and copper powder are sequentially loaded into the graphite mold, and the silicon-germanium alloy block, aluminum flake, and copper powder are sequentially loaded into the graphite mold. The vacuum degree is 1.3×10 -3MPa, the sintering pressure is 29Mpa, and the temperature is raised to 430°C at a rate of 35°C / min for SPS hot pressing sintering for 13min, thereby producing a thermoelectric element. The thermoelectric element has a silicon germanium alloy thermoelectric layer, an aluminum barrier layer and a copper electrode layer. After testing, it was found that there were no cracks and obvious diffusion between the interfaces.
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