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Welding integration technology of medium- and high-temperature thermoelectric power generation devices and manufacturing tool

A technology for thermoelectric power generation and welding tools, which is applied in the manufacture/processing of thermoelectric devices, manufacturing tools, welding equipment, etc., can solve the problems of poor dimensional consistency of formed devices, excessive processing tolerances, and low local welding strength, and achieve simplification. The complexity of assembly and the difficulty of positioning, reducing the welding integration temperature, and ensuring the effect of dimensional accuracy

Pending Publication Date: 2022-01-25
SHENZHEN INST OF ADVANCED ELECTRONICS MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the solid-state diffusion welding process puts forward high requirements on the processing and assembly accuracy of the device. If the processing tolerance of the material party is too large, it will easily lead to too low local welding strength, or poor dimensional consistency of the formed device; at the same time, the solid-state soldering piece The efficiency of positioning and assembly is also very low, which cannot meet the requirements of industrial mass production
In addition, in the integration of multi-level structure devices, due to the great difference in the temperature tolerance of different materials, the solid-state diffusion welding process cannot meet the simultaneous integration welding of multi-level heterogeneous interfaces at the same time.

Method used

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  • Welding integration technology of medium- and high-temperature thermoelectric power generation devices and manufacturing tool
  • Welding integration technology of medium- and high-temperature thermoelectric power generation devices and manufacturing tool
  • Welding integration technology of medium- and high-temperature thermoelectric power generation devices and manufacturing tool

Examples

Experimental program
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Effect test

Embodiment 1

[0051] The N-type and P-type skutterudite materials were hot-pressed and sintered at 650°C and 550°C, respectively, with a pressure of 60MPa, kept for 30 minutes and sintered densely, and the sintered density was 95%; then the double-sided surfaces were thinned and polished to a thickness of 8mm. After dilute hydrochloric acid corrosion, sputter Nb and Ni metal connection layers in sequence under magnetron sputtering, with a thickness of 3 microns and 5 microns respectively, and then cut them into thermoelectric particles 7 with a size of 4mm*4mm*8mm; prepare CuAgZn solder paste until the viscosity is 800Kcps, using a steel sheet with a thickness of 0.01mm, the solder paste is evenly applied to the aluminum oxide substrate with a size of 20mm*20mm by screen printing to obtain the upper substrate 8( Figure 3b Shown is the stencil used for screen printing on the upper substrate 6) and the lower substrate 6 ( Figure 3a Shown is the stencil mesh used for screen printing of the l...

Embodiment 2

[0058] N-type Zr 0.5 f 0.5 NiSn 0.98 Sb 0.02 and P-type Nb 0.8 Ti 0.2 The FeSb material was sintered by spark plasma at 850°C and 850°C respectively, the pressure was 60MPa, and the temperature was kept for 15 minutes for sintering and density, and the sintering density was 95%. 2 microns and 5 microns, and then cut into thermoelectric particles of 4mm*4mm*12mm; the CuAgTi solder paste was adjusted to a viscosity of 1600Kcps, and it was printed on a stencil with a thickness of 0.3mm to a nitrided particle with a size of 20mm*20mm. On the aluminum substrate, the thermoelectric particles are positioned and brazed under pressure at 850°C with a pressure of 5MPa to obtain a half-Heusler power generation device in the high temperature region.

[0059] The structure and installation of the welding tool in this embodiment are the same as those in Embodiment 1.

[0060] For the power generation performance data of the high-temperature region half-Heusler power generation device ...

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Abstract

The invention discloses a welding integration technology of medium- and high-temperature thermoelectric power generation devices and a manufacturing tool and belongs to the technical field of thermoelectric power generation device integration. The welding integration technology comprises the following steps of material sintering, surface treatment, connecting layer deposition, particle cutting, silk-screen printing, positioning assembly and welding. According to the welding integration technology and manufacturing tool of the invention, the screen printing technology is adopted to coat high-temperature soldering paste on the substrate electrode of a high-temperature thermoelectric device or the end face of the electrode of a thermoelectric material, and the vacuum welding process is also adopted, so that batch integrated development of the medium-and high-temperature thermoelectric devices is realized; on one hand, high-precision self-adhesion of the soldering paste can be achieved, the assembling complexity degree and the positioning difficulty are simplified, meanwhile, full contact between thermoelectric blocks and electrode bonding pads and between heterogeneous materials can be achieved through the soldering paste, and the welding quality at the high temperature and the size precision of the whole device are guaranteed; and on the other hand, the integration efficiency of the medium- and high-temperature thermoelectric devices is greatly improved.

Description

technical field [0001] The invention relates to the technical field of integration of thermoelectric power generation devices, in particular to a welding integration technology and tooling for medium and high temperature thermoelectric power generation devices. Background technique [0002] The implementation of the current carbon neutralization and carbon peaking strategy puts forward higher requirements for the efficient recycling of energy, and the thermoelectric power generation technology based on semiconductor materials is a static energy conversion technology with high reliability, long life, and miniaturization. It has a very broad application prospect in the field of low-grade waste heat recovery. [0003] At present, thermoelectric power generation devices are mainly divided into low-temperature devices, medium-temperature devices and high-temperature devices according to the working temperature. Among them, low-temperature devices usually use bismuth telluride mat...

Claims

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Application Information

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IPC IPC(8): H01L35/34B23K1/00
CPCB23K1/0008H10N10/01
Inventor 刘睿恒刘欢冯江河孙蓉
Owner SHENZHEN INST OF ADVANCED ELECTRONICS MATERIALS
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