Preparation method for nano skutterudite compound pyro electric material

A thermoelectric material and skutterudite technology, applied in the field of preparation of nanometer skutterudite compound thermoelectric materials, can solve problems such as difficulty in preparing nanocrystalline thermoelectric materials, and achieve simple preparation process, easy large-scale industrial production, and particle distribution. narrow effect

Inactive Publication Date: 2005-03-16
WUHAN UNIV OF TECH
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Problems solved by technology

Most of the thermoelectric materials obtained by the current preparation technology are microcrystalline thermoelectric materials, and it is difficult to prepare nanocrystalline thermoelectric materials.

Method used

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  • Preparation method for nano skutterudite compound pyro electric material
  • Preparation method for nano skutterudite compound pyro electric material
  • Preparation method for nano skutterudite compound pyro electric material

Examples

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Embodiment 1

[0045] The invention adopts a tungsten carbide ball mill jar, the ball mill medium is tungsten carbide balls, and the diameters of the balls are 10mm and 5mm respectively. During the experiment, it was found that the ball milling effect was the best when the material-ball ratio was 1:7. Table 1 shows the effect of ball size on the particle size of powder after ball milling. The particle size of the powder obtained by ball milling for 24 hours under different grading ratios with a feed-to-ball ratio of 1:7, a rotational speed of 300r / min, and a ball milling time of 24 hours. The table lists the corresponding relationship between the powder particle size and its percentage. It can be seen that the impact of medium gradation on particle size and distribution range is significant. On the one hand, the mass of large balls is large, and the addition of large balls is beneficial to the minimum particle size of powder particles. When the mass percentage of large balls reaches 20%, th...

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Abstract

The invention relates to nanometer skutterudite compound thermoelectric material preparation method, i.e. combining high-energy ball milling method with discharging plasma sintering for preparing nanometer skutterudite compound thermoelectric material. Cobalt powder and antimony powder available in the market are used as material, and skutterudite compound CoSb#-[3] is manufactured by solid phase reaction method, then high-energy ball wet milling is adopted, controlling material ball ratio, ball diameter grading, ball mill rotate speed and time, obtaining average grain diameter 50nm powder thermoelectric material, at last nano powder obtained is poured into mould, which is placed in discharging plasma sintering apparatus, obtaining mean crystalline grain size 100nm, high compactness degree,high performance CoSb#-[3] nanocrystalline thermoelectric material. The inventive method adopts nano powder as sintering material, and the discharge plasm sintering temperature is low, which is energy-saving and time-saving, being suitable for industrialized production.

Description

technical field [0001] The invention relates to a preparation method of a nano-skutterudite compound thermoelectric material, belonging to the field of new energy materials. Background technique [0002] The skutterudite compound CoSb 3 It is a medium-temperature thermoelectric material with excellent performance. It has large carrier mobility and high electrical conductivity. It is expected to be widely used in thermoelectric power generation and has broad application prospects in military, medical, and civil applications. Especially with the increasingly serious environmental and energy problems, thermoelectric materials show great potential in the conversion and utilization of solar energy. However, due to the high thermal conductivity of skutterudite compounds, their thermoelectric performance index and thermoelectric conversion efficiency are relatively low. Studies have shown that nanotechnology is expected to increase the Seebeck coeffi...

Claims

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Application Information

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IPC IPC(8): C22C1/04C22C12/00C22C19/07
Inventor 唐新峰余柏林祁琼宋波张清杰
Owner WUHAN UNIV OF TECH
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