Treatment method of thermoelectric materials before welding

Abstract

The invention relates to a treatment method of thermoelectric materials before welding. The treatment method is characterized by including steps of alkali wash and acid wash of a thermoelectric material sheet, coarsening of the thermoelectric material sheet, chemical nickel plating and soldering flux immersing. According to the treatment method, sodium hypophosphite is added into a solution which is subjected to chemical nickel plating, the temperatures are kept to be 85-95 DEG C, and a P-Ni alloy nickel layer which is high in binding forces, excellent in weldability and uniform in thickness is formed on the surface of the thermoelectric material sheet and used as a transition layer. When a thermoelectric refrigeration assembly manufactured by the thermoelectric material sheet and formed by welding thermoelectric elements works in the temperature environment of (-55) DEG C-115 DEG C, the thermoelectric elements can not fall off, space resistant radiation is 300 Krad (Si), and the failure rate is 200 fit. The service life of the thermoelectric refrigeration assembly can reach 15 years in the working environment, and the thermoelectric refrigeration assembly can be widely applied to electrical devices with high reliability and long service life.

Description

technical field [0001] The invention belongs to the technical field of manufacturing thermoelectric refrigeration components, and in particular relates to a treatment method for thermoelectric materials before welding. Background technique [0002] At present, the surface treatment process of the thermoelectric material sheet used in the production of thermoelectric cooling components is mostly: cleaning the cut thermoelectric material sheet, dipping the cleaned thermoelectric material sheet into tin with a common and mature process technology, and finally passing The mature process technology welds the BiSn solder with the highest melting point temperature ≤ 138 ℃ on the thermoelectric material sheet after tin immersion, and finally makes the thermoelectric cooling component. [0003] With the continuous expansion of the application range of thermoelectric cooling components, the application environment is more complex. When the working environment temperature of thermoelec...

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Problems solved by technology

[0003] With the continuous expansion of the application range of thermoelectric cooling components, the application environment is more complex. When the working environment temperature of thermoelectric cooling components is ≥ 100 ° C, due to the low temperature of the BiSn solder on the thermoelectric material sheet, the thermoelectric cooling components made It is easy to cause the thermoelectric element to fall off in the cooling component, which reduces the reliability and life of the thermoelectric cooling component. Therefore, the thermoelectric cooling component prepared by conventional low-temperature solder cannot be widely used, which limits the thermoelectric cooling component. Application range of refrigeration components

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