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ca3co4o9/bi2ca2co2oy composite thermoelectric material and preparation method thereof

A technology of thermoelectric materials and composite particles, which is applied in the directions of thermoelectric device junction lead-out materials, thermoelectric device manufacturing/processing, etc., can solve the problem that ZT is not effectively improved.

Inactive Publication Date: 2018-03-02
XIHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] There are related data reports, so that Bi 2 o 3 As co-solvent, Ca grown by optical floating zone method 3 co 4 o 9 / Bi 2 Ca 2 co 2 o y The composite thermoelectric material has good orientation characteristics, and its power factor can reach 0.3, but the thermal conductivity κ has also been significantly improved, and ZT has not been effectively improved

Method used

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  • ca3co4o9/bi2ca2co2oy composite thermoelectric material and preparation method thereof
  • ca3co4o9/bi2ca2co2oy composite thermoelectric material and preparation method thereof
  • ca3co4o9/bi2ca2co2oy composite thermoelectric material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0051] Ca 3 co 4 o 9 / Bi 2 Ca 2 co 2 o y Preparation method of composite thermoelectric material:

[0052] The first step: the Ca synthesized by the cosolvent method 3 co 4 o 9 Bi synthesized by powder and solid state reaction method 2 Ca 2 co 2 o y Mix according to the mass ratio of 40:60, and ball mill for 30 minutes. The ball milling process parameters are: ball to material ratio 5:1, speed 300r / min.

[0053] The second step: hot pressing at 600°C and 80MPa into a sheet of ф12.7×(4-5)mm, holding time for 10min, then sintering at 820°C for 20h and cooling with the furnace.

[0054] Step 3: After taking out the flake material and pulverizing it, ball mill it again for 30 minutes. The process parameters of the ball mill are still: the ratio of ball to material is 5:1, the speed is 300r / min, and it is hot pressed again at 600°C and 80MPa to form ф14×(14-15)mm The block was kept under pressure for 10 minutes, sintered at 820°C for 20 hours, and cooled with the furnac...

Embodiment 2

[0058] Ca 3 co 4 o 9 / Bi 2 Ca 2 co 2 o y Preparation method of composite thermoelectric material:

[0059] The first step: the Ca synthesized by the cosolvent method 3 co 4 o 9 Bi synthesized by powder and solid state reaction method 2 Ca 2 co 2 o y Weigh according to the amount of substance ratio 60:40, the weighed Bi 2 Ca 2 co 2 o y Divide into 4 equal portions. First the weighed Ca 3 co 4 o 9 Powder and 1 part Bi 2 Ca 2 co 2 o y Mix and ball mill for 30 minutes, the ratio of ball to material is 5:1.

[0060] Step 2: Then hot press at 700°C and 100MPa to form a sheet of ф12.7×(4-5)mm, hold the pressure for 3min, sinter at 900°C for 10h, and cool with the furnace. Take out the flake material, crush it, and add 1 more weighed part of Bi 2 Ca 2 co 2 o y , ball milled for 30min, the ratio of ball to material is still 5:1, hot pressed at 700℃ and 100MPa into a sheet of ф12.7×(4-5)mm, holding time for 3min, sintered at 900℃ for 10h, and cooled with the...

Embodiment 3

[0065] Ca 3 co 3.9 Cu 0.1 o 9 / Bi 2 Ca 2 co 1.9 Cu 0.1 o y Preparation method of composite thermoelectric material:

[0066] The first step: the Ca synthesized by the cosolvent method 3 co 3.9 Cu 0.1 o 9 Bi synthesized by powder and solid state reaction method 2 Ca 2 co 1.9 Cu 0.1 o y Mix according to the mass ratio of 35:65, and ball mill for 30 minutes. The ball milling process parameters are: the ball-to-material ratio is 5:1, and the speed is 300r / min.

[0067] The second step: hot pressing at 650°C and 90MPa into a sheet of ф12.7×(4-5)mm, holding time for 3min, then sintering at 820°C for 15h and cooling with the furnace.

[0068] Step 3: After taking out the flake material and pulverizing it, ball mill it again for 30 minutes. The ball milling process parameters are still: ball-to-material ratio 5:1, speed 300r / min, heat press again at 650°C and 90MPa into ф14×(14-15)mm The block was kept under pressure for 3 minutes, sintered at 820°C for 15 hours, and...

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Abstract

The invention provides a Ca3Co4O9 / Bi2Ca2Co2Oy composite thermoelectric material and a preparation method thereof. It is composed of multiple composite particles, each of which is alternately connected by Ca3Co4O9 particles and Bi2Ca2Co2Oy particles; the composite particles contain multiple Ca3Co4O9 particles, and the angle between the ab planes of multiple Ca3Co4O9 particles is ≤10°, each Each Ca3Co4O9 particle is connected to the ab surface of the adjacent Bi2Ca2Co2Oy particle along its ab plane, and the angle between the ab plane of each Ca3Co4O9 particle and the ab plane of the adjacent Bi2Ca2Co2Oy particle is ≤10°. The composite material provided by the invention has higher electrical conductivity, larger Seebeck coefficient and lower thermal conductivity, and the thermoelectric performance of the single Ca3Co4O9 material is significantly improved.

Description

technical field [0001] The invention relates to the field of thermoelectric material engineering, in particular to a Ca 3 co 4 o 9 / Bi 2 Ca 2 co 2 o y Composite thermoelectric material and its preparation method. Background technique [0002] Thermoelectric materials are a class of functional materials that can realize the direct conversion of thermal energy and electrical energy. The performance of thermoelectric materials is expressed by the dimensionless thermoelectric figure of merit ZT: The larger the ZT value, the better the thermoelectric performance of the material. where S is the Seebeck coefficient of the material, σ is the electrical conductivity of the material, κ is the thermal conductivity, and T is the absolute temperature. PF=S 2 σ is called the power factor of the material. [0003] Ca 3 co 4 o 9 It is an oxide thermoelectric material with a layered structure. It has a large electrical conductivity in the ab plane parallel to the layer, and a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L35/14H01L35/18H01L35/34H10N10/851H10N10/01H10N10/853
CPCH10N10/851H10N10/853H10N10/01
Inventor 金应荣贺毅龚鹏冯宁博苏敏刘旭冉李树艳鲁云栾道成吴晓春
Owner XIHUA UNIV