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Preparation method of bismuth-tollurium base thromoelectric alloy

A tellurium-based, thermoelectric material technology, applied in the field of thermoelectric alloys and their preparation, to achieve large aspect ratio, good mechanical properties, and improve the effect of orientation

Inactive Publication Date: 2006-04-12
BEIJING CISRI GAONA TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is the same as the sintering technology of CN1488572A with the above-mentioned Chinese published patent number, therefore also has the same shortcoming

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0029] Bi powder and Te powder with a purity of 99.999%, according to Bi 2 Te 3 The ratio of the chemical formula is mixed, put into a quartz tube, and sealed after vacuuming, the vacuum degree is 1×10 -3 Pa.

[0030] Place the quartz tube loaded with raw materials in a resistance furnace for melting at a melting temperature of 500°C, keep it warm for 10 hours, turn it every two hours to make the melting even, take it out for rapid cooling and quick quenching. Rapid quenching cooling rate is 1×10 5 °C / sec.

[0031] The amorphous flaky strips obtained by smelting and quenching are smashed in a mortar, and then put into a ball mill for ball milling. Using ceramic pots and ceramic balls, the ball-to-material ratio is 5:1, and the ball milling time is 3 hours. The powder was rinsed with alcohol and dried under vacuum.

[0032] Put the prepared powder into a graphite mold, then place it in a sintering furnace, and carry out secondary sintering on the prepared powder by vacuum ...

Embodiment 2

[0034] Purity is 99.999% Bi powder, Te powder, Sb powder, according to chemical formula (Bi 2 Te 3 ) 0.2 (Sb 2 Te 3 ) 0.8 The atomic percentages are mixed, packed into a quartz tube, filled with inert gas Ar and sealed.

[0035] The quartz tube with sealed raw materials is placed in a resistance furnace for smelting. The smelting temperature is 670°C, and the temperature is kept for 15 hours. Turn it over every two hours to make the smelting even. 5 °C / sec.

[0036] The amorphous flaky strips obtained by smelting and quenching were smashed in a mortar, and then put into a ball mill for ball milling. Using ceramic pots and ceramic balls, the ball-to-material ratio was 7:1, and the ball milling time was 3.2 hours. The powder was rinsed with alcohol and dried under vacuum.

[0037]Put the prepared powder into a graphite mold, then place it in a sintering furnace, and carry out secondary sintering on the prepared powder by vacuum hot pressing. The hot pressing temperature i...

Embodiment 3

[0039] Purity is 99.999% Bi powder, Te powder, Se powder, according to the chemical formula (Bi 2 Te 3 ) 0.975 (Bi 2 Se 3 ) 0.025 The atomic percentage ratio is mixed, packed into a quartz tube, sealed after vacuuming, and the vacuum degree is 1×10 -3 Pa.

[0040] The quartz tube with sealed raw materials is placed in a resistance furnace for smelting, the melting temperature is 730°C, and the temperature is kept for 12 hours. Turn it over every two hours to make the smelting even. 5 °C / sec.

[0041] The amorphous flaky strips obtained by smelting and quenching are smashed in a mortar, and then put into a ball mill for ball milling. Using ceramic pots and ceramic balls, the ball-to-material ratio is 10:1, and the ball milling time is 20 hours. The powder was rinsed with alcohol and dried under vacuum.

[0042] Put the prepared powder into a graphite mold, then place it in a sintering furnace, and carry out secondary sintering on the prepared powder by vacuum hot pressi...

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Abstract

A process for preparing the BiTe-based electrothermal material includes such steps as proportionally mixing raw materials, vacuum smelting for alloying, quick cold quenching for non-crystalline treating, breaking, ball grinding, vacuum drying, hot pressing or hot shear extruding and machining. Its advantages are high density, thermoelectric performance, and machinability and low cost.

Description

technical field [0001] The invention belongs to the field of thermoelectric materials, and relates to a thermoelectric alloy and a preparation method thereof. Background technique [0002] Thermoelectric materials are functional materials that can convert heat and electricity into each other. The discovery of the Seebeck effect and the Peltier effect provides a theoretical basis for the application of thermoelectric energy converters and thermoelectric refrigeration. The performance of thermoelectric materials is mainly characterized by the thermoelectric figure of merit Z, which is defined by the following formula: Z=α 2 σ / k, where α is the Seebeck coefficient, σ is the electrical conductivity, and k is the thermal conductivity. The larger the Z value, the higher the thermoelectric conversion rate of the material. Therefore, an ideal thermoelectric material should be an alloy material with as high a Seebeck coefficient as possible, high electrical conductivity, and low the...

Claims

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Application Information

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IPC IPC(8): C22C1/04C22C29/00B22F3/14B22F9/00
Inventor 任卫柳学全王晓林糜家铃李红云张瑞勇任勃
Owner BEIJING CISRI GAONA TECH
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