Protective coating for thermoelectric material or thermoelectric device

Abstract

The invention relates to a protective coating for thermoelectric materials or thermoelectric devices, which includes a ceramic composite bottom layer and a glass surface layer that are sequentially coated on the surface of the thermoelectric material or thermoelectric device. The thickness of the ceramic composite bottom layer is 10 to 500 μm; The thickness of the glass surface layer is 10-1000 μm. The glass surface layer can seal defects in the ceramic composite bottom layer, ensuring the integrity of the coating and avoiding failure during high temperature and thermal cycle service. Therefore, compared with a single ceramic composite coating, the protective coating of the present invention has better heat resistance and 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...

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