A kind of preparation method of functional gradient thermoelectric material
A technology of functional gradient and thermoelectricity, which is applied in the field of thermoelectricity, can solve the problems of reduced electrical performance, poisoning of thermoelectricity, and influence on reliability, so as to improve thermoelectric performance and performance stability, high electrical performance, and small overall resistance. Effect
Inactive Publication Date: 2014-10-15
CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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Problems solved by technology
Although this method realizes the integration of different materials, it produces brazing contact resistance between different component materials, which in turn causes the overall resistance of the prepared functionally gradient material to increase and the electrical properties to decrease. Moreover, the use of solder may also affect the temperature difference. The performance itself is poisoned, which affects the reliability of its long-term work
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[0020] The present invention will be further described in detail below through specific examples. The following examples are only descriptive, not restrictive, and cannot limit the protection scope of the present invention.
[0021] A method for preparing a functionally gradient thermoelectric material, the steps are:
[0022] Step (1): respectively smelting the PbSnTe alloy material 5 and the GeTe alloy material 3 in the intermediate frequency furnace;
[0023] Step: crush the PbSnTe and GeTe alloy materials in (1) into powder, and sieve with a 120-mesh sieve;
[0024] Step (3): select part of the sieved PbSnTe and GeTe powders in (2) and mix them at a mass ratio of 1:1, and use a mortar to mix into a uniform mixed powder as transition material 4;
[0025] Step (4): PbSnTe powder after sieving in (2), transition layer in (3) and GeTe powder after sieving in (2) are sequentially put into graphite mold 7 from bottom to top;
[0026] Step ⑸: Put the graphite mold in ⑷ into the...
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The invention relates to a preparation method of a functional gradient thermoelectric material, comprising the steps of: (1) respectively smelting two kinds of alloy materials with the approximate melting points in an intermediate frequency furnace; (2) crushing the two kinds of alloy materials in the step (1) into powder, sieving with a 80-240 mesh sieve; (3) selecting parts of the two kinds of powders after sieving in the step (2) and mixing according to a mass ratio of 1:1, mixing in a mortar into uniformly mixed powder as a transitional powder; (4) adding the transitional powder in the step (3) between the two kinds of powders after sieving in the step (2), and placing into a graphite mold; (5) performing hot press or plasma spark sintering on the graphite mold in the step (4); and (6) after pressing is finished, taking out the mold after the temperature of a hot pressing furnace drops to room temperature, and demolding with a jack to take out the material, namely the functional gradient thermoelectric material. The functional gradient thermoelectric material has the characteristics of low overall resistance, high electrical property, no toxicity of thermoelectric property and reliability of long term operation.
Description
technical field [0001] The invention belongs to the technical field of thermoelectrics, and in particular relates to a preparation method of a functionally gradient thermoelectric material. Background technique [0002] A thermoelectric battery is an energy conversion device that can directly convert electrical energy into thermal energy, consisting of a heat source and a thermoelectric power generation device. The battery has the characteristics of compact structure, no moving parts, high reliability, and is not affected by environmental conditions. Scientists at home and abroad are working to further improve the thermoelectric conversion efficiency of the battery, and the most important way to improve the conversion efficiency of the battery is to improve the thermoelectric properties of the thermoelectric materials used, that is, to keep each material at the optimal temperature as much as possible. The thermoelectric material is at the optimum value in the whole working ...
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IPC IPC(8): B22F3/105B22F3/14
Inventor 张丽丽任保国阎勇
Owner CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST