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Rapid diffusion welding connection method for skutterudite thermoelectric material and electrode

A technology of thermoelectric materials and connection methods, which is applied in welding equipment, non-electric welding equipment, welding/welding/cutting items, etc., can solve the problems of element volatilization and element diffusion, and achieve high strength, reduce element diffusion, and high-efficiency connection methods Effect

Active Publication Date: 2020-04-17
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problems of Sb element volatilization and element diffusion when the existing skutterudite thermoelectric material is connected to the electrode, the present invention proposes a fast diffusion welding connection method for the skutterudite thermoelectric material and the electrode

Method used

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  • Rapid diffusion welding connection method for skutterudite thermoelectric material and electrode
  • Rapid diffusion welding connection method for skutterudite thermoelectric material and electrode
  • Rapid diffusion welding connection method for skutterudite thermoelectric material and electrode

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specific Embodiment approach 1

[0023] Specific embodiment one: this embodiment is used for the rapid diffusion welding connection method of skutterudite thermoelectric material and electrode is carried out according to the following steps:

[0024] Step 1. Take the electrode and clean the surface to be welded;

[0025] Step 2, electroplating an alloy barrier layer on the surface of the electrode to be welded after the treatment in step 1;

[0026] The temperature of the electroplating is 40-65°C, the current is 0.5-1.5A, and the time is 15-120min;

[0027] Step 3, the surface of the skutterudite thermoelectric material to be welded is cleaned;

[0028] Step 4. Stack the electrode obtained in step 2 and the skutterudite thermoelectric material. The alloy barrier layer of the electrode faces the surface of the skutterudite thermoelectric material to be welded to form a weldment, perform diffusion welding, and cool down to room temperature after diffusion welding, that is Finish;

[0029] The process of dif...

specific Embodiment approach 2

[0034] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the method for cleaning the surface of the electrode to be welded in step 1 is: successively use No. 600, No. 1000, No. 2000, No. 3000, and No. 5000 water abrasive paper to polish step by step The surface of the electrode to be welded is then polished, and finally ultrasonically cleaned; the cleaning of the electrode to be welded can remove the oxide film and oil. Other steps and parameters are the same as those in the first embodiment.

specific Embodiment approach 3

[0035] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the electrode in step 1 is a copper-based electrode; the material of the copper-based electrode is Cu-Mo alloy, Cu-W alloy, Cu-Mo alloy, Cu-Cr alloy, Cu-V alloy, Cu-Ni alloy, Cu-A1 alloy or pure Cu, etc. Other steps and parameters are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a rapid diffusion welding connection method for a skutterudite thermoelectric material and an electrode, and relates to a diffusion welding connection method. The method aims to solve the problems of Sb element volatilization and element diffusion when the existing skutterudite thermoelectric material is connected with an electrode. The method comprises the steps of takingan electrode, cleaning a to-be-welded surface, electroplating an alloy barrier layer on the surface of the to-be-welded surface of the electrode, cleaning the to-be-welded surface of the skutteruditethermoelectric material, and performing diffusion welding. The barrier layer is prepared on the electrode side through an electroplating method, diffusion welding is achieved between the barrier layerand the skutterudite thermoelectric material under the relatively low pressure and at the relatively low temperature, element diffusion of weld joint elements and skutterudite does not exist in the process, and Sb element volatilization and element diffusion can be prevented. The method is suitable for welding the skutterudite thermoelectric material and the electrode.

Description

technical field [0001] The invention relates to a diffusion welding connection method. Background technique [0002] Sutterudite is currently one of the thermoelectric materials with the best thermoelectric properties in the medium temperature range (500°C-550°C). As the most common medium temperature thermoelectric material, skutterudite not only has good mechanical properties and reliability, but also has excellent economy and environmental friendliness. In the preparation of thermoelectric devices, p-type thermoelectric materials and n-type thermoelectric materials need to be connected in series to form a closed loop. However, due to the existence of problems such as contact resistance, diffusion problems, and thermal expansion coefficients, it is of great significance to achieve a reliable connection between skutterudite thermoelectric materials and electrodes. [0003] The operating temperature of skutterudite thermoelectric materials is 25 ° C ~ 550 ° C. At present, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/00B23K20/24B23K103/18
CPCB23K20/001B23K20/24B23K2103/18
Inventor 耿慧远冯杭彬张丽霞冯吉才
Owner HARBIN INST OF TECH
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