Fabricating method of Mg base thermoelectricity material
A technology of thermoelectric materials and preparation steps, which is applied in the field of preparation of magnesium-based thermoelectric materials, can solve problems such as poor tissue uniformity, complicated experimental procedures, and long time consumption, and achieve the effects of improving performance and shortening the process flow
Inactive Publication Date: 2010-01-20
UNIV OF SCI & TECH BEIJING
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Problems solved by technology
Although this experiment successfully prepared Ag-doped Mg2Si-based thermoelectric materials, it took a long time, the experimental process was complicated, and the thermoelectric properties of the samples were poor. At 513K, the ZT value was only 0.01
[0004] No matter it is solid-phase synthesis method or smelting method, there are disadvantages such as long preparation time, easy introduction of impurities in the preparation process, and poor uniformity of structure, which directly lead to low performance of magnesium-based thermoelectric materials.
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[0016] Weigh the raw materials according to the chemical ratio of Mg2SixSn1-x (x=0, 0.2, 0.4, 0.6, 0.8, 1.0) solid solution, and then use a vibrating mixer to mix for 20-30 minutes to fully mix the raw materials evenly. The raw materials are high-purity Mg powder (purity: 99.9%, melting point: 648.8°C), high-purity Si powder (purity: 99.99%), high-purity Sn powder (purity: 99.9%), and the average particle size is less than 75 μm.
[0017] Then put the uniformly mixed raw materials into the corundum crucible, compact it, cover the KCl dissolved salt, and put it into the well-type resistance furnace. The furnace temperature is 500°C, and high-purity argon gas is introduced in advance to exhaust the air in order to minimize the oxidation and dissipation of magnesium.
[0018] Raise the temperature to 857°C and keep it warm for 1h to make the raw materials react.
[0019] After the heat preservation, continue to heat up to 1050 ° C, stay for 10 minutes, then take it out of the re...
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Abstract
The invention provides a preparation method of a magnesium-based thermoelectric material. A method which combines a semisolid preparation with a discharge plasma sintering and forming is adopted, and the powders of magnesium, and silicon and stannum with high purity are taken as the raw material and heated to the semisolid area of an alloy; in the solidification process of the alloy, a strong mixing is achieved before a fast cooling is carried out. The magnesium-based thermoelectric material after composition is broken and ground into powder, and finally sintered and formed by the discharge plasma. The invention is characterized in that the process is simple and convenient, the composition time is short, and the prepared magnesium-based thermoelectric material has excellent thermoelectric performance, uniform tissue, fine crystal grain and without dendritic segregation.
Description
technical field [0001] The invention belongs to the field of new energy materials and relates to a preparation method of a magnesium-based thermoelectric material. Background technique [0002] At present, the most common preparation methods of magnesium-based thermoelectric materials are smelting method and solid-state synthesis method. The smelting method is mainly to mix the raw materials according to the ratio, and then rise above the melting point of the alloy to synthesize the target compound. Although this method can prepare oriented single crystal materials, the oxidation and volatilization of magnesium are very serious during the smelting process. Due to the different specific gravity, the raw materials are prone to delamination in the molten state, and impurities are easily introduced into the product, and the uniformity of the structure is not good. High brittleness, poor machinability, and thermoelectric performance is only superior in one direction. [0003] A...
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IPC IPC(8): B22F9/04H01L35/34
Inventor 宋仁伯杜大伟刘娜娜
Owner UNIV OF SCI & TECH BEIJING