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PbTe powde material formation preparing method

A powder material and compression molding technology, which is applied in the field of thermoelectric material manufacturing, can solve the problems of material thermoelectric and mechanical properties reduction, material multi-void, affecting the efficiency and life of thermoelectric generators, etc., to improve mechanical properties and improve thermoelectric properties Effect

Inactive Publication Date: 2007-06-13
CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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Problems solved by technology

[0003] The currently known method of pressing PbTe thermoelectric materials is the powder metallurgy cold pressing method, and its disadvantages are: the demoulding process is difficult in the pressing process, cracks appear in the PbTe material after sintering; there are many voids in the pressed material, etc. It leads to the reduction of the thermoelectric and mechanical properties of the material, which directly affects the efficiency and life of the thermoelectric generator

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Embodiment Construction

[0011] In order to further understand the invention content, characteristics and effects of the present invention, the following embodiments are enumerated hereby, and detailed descriptions are as follows in conjunction with the accompanying drawings:

[0012] Graphite crucibles are pre-cleaned and treated at high temperature. Before each use, brush the inner surface of the crucible with a stainless steel brush, then wipe it with alcohol cotton, and let it dry. 99.999% raw materials are high-purity lead, tellurium, tin and superior pure lead iodide PbI 2 , according to PbTe+0.3(wt)Pb+0.08(wt)PbI 2 The formula, taking the PbTe material size as Φ40×15.5mm as an example, calculates the required PbTe powder 160g, and according to the proportion, calculates the content of each component as Pb: 99.50g, Te60.98g, pbI 2 0.128g, weigh out the amount of each component, put it into a clean graphite crucible, put it into an intermediate frequency furnace, heat it to 950°C for melting, ke...

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Abstract

The present invention belongs to a PbTe powder material press-forming preparation method. It is characterized by that it uses mould to make PbTe powder material be press-formed. Its preparation process includes the following steps: (1) according to the formula of PbTe+0.3 (wt)Pb+0.08 (wt)PbI2 weighting materials and placing said materials into a graphite crucible; (2) placing said graphite crucible into a vacuum mid-frequency induction smelting furnace, heating and smelting; (3) using ball grinding mill to pulverize the smelted alloy and sieving; (4), cleaning mould and making high-temperature treatment; (5), placing said mould into a thermal pressure furnace, evacuating, introducing hydrogen gas and nitrogen gas; (6) heating thermal pressure furnace, applying pressure and cooling with furnace; (7) placing the hot-pressed material into an annealing furnace and annealing, taking out so as to obtain the invented formed PbTe material.

Description

technical field [0001] The invention belongs to the technical field of thermoelectric material manufacturing, and in particular relates to a molding preparation method of PbTe powder material. Background technique [0002] PbTe thermoelectric material is a typical and excellent material to realize the mutual conversion between heat energy and electric energy. The generator made of this thermoelectric material has small volume, no moving parts, no noise, no pollution, no wear, and reliable operation. And other outstanding advantages, has a wide range of use value; PbTe thermoelectric material processing process directly affects the performance of PbTe thermoelectric material, and ultimately determines the quality of the generator made of it. [0003] The currently known method for pressing PbTe thermoelectric materials is the powder metallurgy cold pressing method, which has the disadvantages of: difficult demoulding during the pressing process, cracks appear in the PbTe mate...

Claims

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Application Information

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IPC IPC(8): B22F3/14H01L35/34
Inventor 龙春泉任保国王泽深张建中魏增
Owner CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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