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Method for improving Ag-Pb-Sb-Te pyroelectric material performance

A thermoelectric material, ag-pb-sb-te technology, applied in the field of thermoelectric conversion functional materials and its preparation, can solve the problems of special material preparation technology, and achieve the effects of easy mass production, improved thermoelectric performance, and increased stability

Active Publication Date: 2009-10-21
TSINGHUA UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

In recent years, Ag-Pb-Sb-Te quaternary compound thermoelectric materials have attracted widespread attention because of their excellent thermoelectric properties. K.F.Hsu et al. (Science, 303, 2004, 818) first reported the quaternary compound thermoelectric materials , but the material preparation technology used is quite special

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  • Method for improving Ag-Pb-Sb-Te pyroelectric material performance
  • Method for improving Ag-Pb-Sb-Te pyroelectric material performance
  • Method for improving Ag-Pb-Sb-Te pyroelectric material performance

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Embodiment Construction

[0018] (1) Mechanical alloying treatment: high-purity Ag (99.9%, 150 μm), Pb (99.9%, 75 μm), Sb (99.9999%, 150 μm) and Te (99.999%, 150 μm) powder are pressed into Ag 0.8 Pb 22.5 SbT 20 The metering ratio is weighed, the total amount is about 20g, put into a stainless steel ball mill jar, add stainless steel grinding balls, and the ball-to-material ratio is about 20:1. Then the ball mill jar is sealed, vacuumized and filled with Ar+5at%H 2 Mixed gas to inhibit the oxidation of raw materials during ball milling. Put the ball mill jar on the QM-2L planetary ball mill, and mill it at a speed of about 350rpm / min for 4 hours for mechanical alloying treatment. After the mechanical alloying is completed, the sample is taken out, and the XRD characterization results are as follows: figure 1 As shown in (a), it can be seen that the sample powder obtained by mechanical alloying is a β-PbTe phase with a face-centered cubic structure and a small amount of Pb elemental substance.

[0...

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Abstract

The invention relates to a method for improving Ag-Pb-Sb-Te thermoelectric material property, which belongs to the technical field of new energy material and the preparation thereof. The method comprises the following steps: firstly, weighing high-purity Ag powder, Pb powder, Sb powder and Te powder according to the stoichiometric ratio, evenly mixing, placing into a ball grinding tank to do mechanical alloy treatment, putting power which is got from ball grinding into a graphite mold to do spark plasma sintering, sintering, cleaning and drying the surface of the sinter lump body after polishing, and placing into a glass tube to anneal, wherein annealing temperature is 370-390 DEG C, and annealing time is 3-30 days. The method has the advantages of achieving the purpose of greatly improving thermoelectric properties of the material and obtaining thermoelectric material for high-performance medium-temperature thermoelectric generation when 700K dimensionless figure of merit ZT reaches 1.5.

Description

technical field [0001] The invention belongs to the technical field of thermoelectric conversion functional materials in new energy materials and their preparation, and particularly relates to a method for improving the performance of Ag-Pb-Sb-Te thermoelectric materials, including mechanical alloying, discharge plasma sintering and annealing processes. Background technique [0002] Thermoelectric materials are a new type of energy materials that directly convert thermal energy and electrical energy based on the Seebeck effect and the Peltier effect. Thermoelectric devices made of thermoelectric materials have the characteristics of small size, simple structure, no moving parts, no noise, long life and high reliability, no emission of pollutants, and wide applicable temperature range. It is an environmentally friendly energy conversion technology. In recent years, with the increasingly severe environmental and energy problems, the application of thermoelectric devices has be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/04B22F3/105C22F1/00
Inventor 李敬锋周敏
Owner TSINGHUA UNIV