Protective coating for thermoelectric material or thermoelectric device

A technology of thermoelectric devices and thermoelectric materials, applied to thermoelectric devices, coatings, and layered products that only use the Peltier or Seebeck effect, can solve problems such as migration and coating microcracks, and achieve good compatibility and protection , the effect of low thermal conductivity

Active Publication Date: 2015-09-09
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the difference in thermal expansion coefficient between the composite coating and the thermoelectric base material, thermal stress and strain will be generated during use, which may cause defects such as microcracks in the coating, and the low melting point glass frit will open at high temperature. The network structure may lead to the migration of easily sublimable elements such as Sb between the matrix thermoelectric material and the glass phase

Method used

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  • Protective coating for thermoelectric material or thermoelectric device
  • Protective coating for thermoelectric material or thermoelectric device
  • Protective coating for thermoelectric material or thermoelectric device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0095] Take 15.00 g of methyltrimethoxysilane, 5.00 g of ethanol, and 5.01 g of water, adjust the pH to 3-4 with nitric acid, and bathe in oil at 60°C for 10 minutes to obtain component A. Glass powder (nominal chemical composition: 10 parts by weight of Na 2 O, 20 parts by weight of K 2 O, 10 parts by weight of TiO 2 , 10 parts by weight of BaO, 50 parts by weight of SiO 2 ) and silica sol at a ratio of 1:1 (parts by weight) to obtain component B. Blend B and A at a ratio of 1:5 (parts by weight), and stir evenly to obtain the desired slurry. Apply the slurry on the surface of the skutterudite-based thermoelectric material that has been sandblasted (the π-type device is polished to 400 mesh), ultrasonically cleaned, and dried at 80°C, and cured once in a vacuum drying oven at 100°C×2 hours at a low temperature to obtain a coating.

Embodiment 2

[0097] Preparation of ceramic composite bottom layer:

[0098] Preparation of Component A: Blend 13.61 grams of methyltrimethoxysilane with 5.4 grams of deionized water adjusted to pH 4-5 with nitric acid, and stir in a water bath at 60°C for 20 minutes to obtain Component A, which is Hydrolyzed polymer product of methyltrimethoxysilane;

[0099] The preparation of component B: with glass powder (nominal chemical composition: the Na of 10 parts by weight 2 O, 20 parts by weight of B 2 o 3 , 5 parts by weight of MgO, 10 parts by weight of TiO 2 , 10 parts by weight of ZnO, 45 parts by weight of SiO 2 ) 4.99 g and 5.09 g of silica sol are blended, adding an appropriate amount of dispersant and other additives, and ball milling at 206 rpm for 5 hours to obtain component B. Then add component A to component B, the mass ratio of component A to component B is 2.5:1. Ball mill at 150 rpm for 20 minutes to obtain organic-inorganic composite slurry. Coat it on the surface of the ...

Embodiment 3

[0104] Preparation of Component A: Mix 14.96 grams of methyltrimethoxysilane with 5.94 grams of deionized water adjusted to a pH value of 4-5 with nitric acid in a three-necked flask. Stir for 20 minutes to obtain Component A, which is a hydrolysis polymerization product of methyltrimethoxysilane;

[0105] The preparation of component B: with glass powder (nominal chemical composition: the Na of 10 parts by weight 2 O, 15 parts by weight of B 2 o 3 , 10 parts by weight of P 2 o 5 , 10 parts by weight of CaO, 55 parts by weight of SiO 2 ) 12.16 g was blended with the same quality of silica sol, added an appropriate amount of dispersant and other additives, and ball milled at 500 rpm for 7 hours and 20 minutes;

[0106] Add component A to component B, the mass ratio of component A to component B is 4:1, and ball mill at 500 rpm for 20 minutes to obtain a composite slurry. It is coated on the surface of the skutterudite-based thermoelectric material that has been sandblaste...

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Abstract

The invention relates to a protective coating for a thermoelectric material or thermoelectric device. The protective coating comprises a ceramic composite bottom layer and a glass surface layer that are applied to the surface of the thermoelectric material or thermoelectric device in order. The thickness of the ceramic composite layer is 10-500micrometers, and the thickness of the glass surface layer is 10-1000micrometers. The glass surface layer can seal the defects of the ceramic composite bottom layer, ensure the coating integrity and avoid failure in high temperature and thermal cycle service process. Therefore, compared with single ceramic composite coating, the protective coating provided by the invention has better heat resistant durability.

Description

technical field [0001] The invention belongs to the technical field of thermoelectric power generation, and relates to a multi-layer or gradient protective coating material, in particular to the protection of thermoelectric materials and devices. More specifically, the present invention provides a protective coating applied to skutterudite-based thermoelectric materials or thermoelectric devices. Background technique [0002] As a functional material that directly converts thermal energy and electrical energy, thermoelectric materials use Seebeck effect and Peltier effect to directly convert thermal energy and electrical energy. Thermoelectric power generation and refrigeration devices have the advantages of small size, light weight, no mechanical transmission parts, and no noise during operation. It has a broad application prospect. At present, aerospace thermoelectric power sources have been applied. How to further break down the barriers to the application of thermoele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B18/00B32B17/06B32B3/24C09D1/00C09D7/12H01L35/32
Inventor 陈立东董洪亮廖锦城李小亚
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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