Preparation method of silicon-germanium alloy material
A technology of silicon-germanium alloy and germanium sheet, which is applied in the field of thermoelectric material preparation, can solve problems that are difficult to completely eliminate, affect thermoelectric performance, and small interdiffusion, etc., and achieve the effects of easy control of process parameters, uniform composition, and simple preparation process
Inactive Publication Date: 2009-10-07
有研科技集团有限公司
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Problems solved by technology
However, the interdiffusion of silicon and germanium atoms is small, and after the segregation is formed, it is difficult to completely eliminate it even after a long time of high-temperature heat treatment, which affects its thermoelectric properties to a certain extent.
Method used
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[0023] Example: Synthesis of P-type Si 8 Ge 2 B 0.05 Silicon-germanium alloy material (silicon and boron pre-smelting)
[0024] The silicon and germanium materials are crushed and finely ground respectively, and passed through a 200-mesh sieve to obtain silicon powder and germanium powder, and another commercial boron powder is taken for later use; 8 B 0.05 The stoichiometric ratio of silicon powder and boron powder is fully mixed, and then it is pressed into a disc with a tablet machine; the silicon powder sheet doped with boron is packaged in a quartz tube under a vacuum condition of 8 B 0.05 -Ge 2 Mix the boron-containing silicon powder and germanium powder in the previous step with a ball mill for 0.5h, and add ethanol as a protective agent during the ball milling process to prevent the sample from oxidation, and then use a tablet machine to press it into a disc; then place it in the Vacuum packaged in a quartz tube under a vacuum of 8 Ge 2 B 0.05 sample, its X-ray ...
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The invention relates to a preparation method of a silicon-germanium alloy material. The method comprises the following steps: (1), the silicon, the germanium and other dopants are mashed and finely ground as the raw materials or the commercial silicon, the commercial germanium and other dopant fines are directly selected as the raw materials; (2), the silicon powder or the germanium powder is fully and evenly mixed with the dopant fines, and then the mixture is tableted and smelted in a protective atmosphere; and (3), the silicon or the germanium block obtained by smelting and containing dopant is manufactured into fine powder and then is fully and evenly mixed with the other powder in the silicon powder and the germanium powder without dopant, and the mixture is tableted and processed by solid-phase reaction in the protective atmosphere at the temperature being close to the solidus of the silicon-germanium alloy to obtain silicon-germanium alloy. The invention provides a process for synthesizing silicon-germanium alloy with uniform components, no aliquation or less aliquation. The invention has the advantages of simple preparation process, easily controlled process parameter and good application prospect.
Description
technical field [0001] The invention relates to a method for preparing a thermoelectric material, in particular to a method for preparing a silicon germanium-based thermoelectric material. Background technique [0002] Silicon-germanium alloys have low thermal conductivity, high thermal stability and low density, and can be used as thermoelectric materials for high-temperature thermoelectric generators above 700K. Thermal energy can be directly converted into electrical energy by using thermoelectric materials, and the power generation system made is small in size and light in weight; it has no mechanical transmission parts, no noise during operation, does not cause any environmental pollution, has a long service life, and is easy to control. Very ideal energy conversion method, especially suitable for applications in special fields such as aerospace and military affairs. [0003] The current silicon-germanium alloy is generally prepared by melting method. Since silicon-ger...
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Inventor 王忠成艳褚颖朱磊简旭宇陈晖尉海军蒋利军
Owner 有研科技集团有限公司