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A method for brazing dissimilar materials assisted by three-dimensional negative expansion network composite interlayer material

A technology of network compounding and dissimilar materials, applied in welding equipment, welding/welding/cutting items, manufacturing tools, etc., can solve problems such as large differences in thermal expansion coefficients, large residual stress in joints, enhanced phase agglomeration content, etc., to achieve reduction Thermal expansion coefficient, relief of residual stress, good effect of joint structure

Active Publication Date: 2022-05-03
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention solves the problem that the residual stress of the joint is too large due to the large difference in the thermal expansion coefficients of the existing ceramic and metal materials, and solves the existing method of introducing a reinforcement phase to reduce the residual stress of the ceramic and metal materials, which has the problem of easy agglomeration of the reinforcement phase and low content to provide a three-dimensional negative expansion network composite interlayer material-assisted method for brazing dissimilar materials

Method used

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  • A method for brazing dissimilar materials assisted by three-dimensional negative expansion network composite interlayer material
  • A method for brazing dissimilar materials assisted by three-dimensional negative expansion network composite interlayer material
  • A method for brazing dissimilar materials assisted by three-dimensional negative expansion network composite interlayer material

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specific Embodiment approach 1

[0025] Specific Embodiment 1: In this embodiment, a method for assisting brazing of dissimilar materials by a three-dimensional negative expansion network composite intermediate layer material is carried out according to the following steps:

[0026] 1. Preparation of three-dimensional negative expansion network composite interlayer material precursor:

[0027] Under the condition of ultrasonic water bath, add cationic metal salt and anionic metal salt to deionized water, stir until they are uniformly dispersed to obtain a mixed solution, put the mixed solution in a reaction kettle, and then impregnate the foam metal in the mixed solution, at a temperature of Under the condition of 100 ℃ ~ 180 ℃, hydrothermal reaction for 2h ~ 12h, and then naturally cooled to room temperature to obtain the precursor, the precursor was washed and dried to obtain the precursor of the three-dimensional negative expansion network composite intermediate layer material;

[0028] The anion metal sal...

specific Embodiment approach 2

[0044] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that in step 1, the precursor is washed and dried according to the following steps: the precursor is alternately washed three times with deionized water and absolute ethanol, and then Dry for 3 hours to 24 hours at a temperature of 60°C to 120°C. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0045] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that the cationic metal salt in step 1 is scandium nitrate, scandium chloride, yttrium nitrate or yttrium chloride. Others are the same as in the first or second embodiment.

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Abstract

The invention relates to a method for assisting brazing of dissimilar materials by a three-dimensional negative expansion network composite intermediate layer material, which relates to a method for assisting brazing of dissimilar materials. The present invention solves the problem that the residual stress of the joint is too large due to the large difference in the thermal expansion coefficients of the existing ceramic and metal materials, and solves the existing method of introducing a reinforcement phase to reduce the residual stress of the ceramic and metal materials, and there is a reinforcement phase that is easy to agglomerate and has a low content The problem. The preparation method: 1. preparing the precursor of the three-dimensional negative expansion network composite intermediate layer material; second, preparing the three-dimensional negative expansion network composite intermediate layer material; third, brazing. The invention is used for three-dimensional negative expansion network composite intermediate layer material to assist brazing of dissimilar materials.

Description

technical field [0001] The invention relates to a method for assisting brazing of dissimilar materials. Background technique [0002] Ceramic materials have low density, high strength and high hardness, corrosion resistance, excellent high temperature resistance and thermal shock resistance, and are widely used in aerospace, nuclear power, automobile, and electronics fields. However, due to the high brittleness of ceramic materials, it is difficult to process them into complex structures, and it is usually necessary to connect ceramic materials with metal heterogeneously to meet actual needs. Brazing is an effective means to realize the connection of dissimilar materials. Brazing can be widely used in the connection of dissimilar materials because it is simple to operate, low in cost, and does not need to melt the base metal and has little effect on the properties of the base metal. However, due to the large performance difference between ceramic materials and metal materia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K1/19B23K1/008B23K1/20
CPCB23K1/19B23K1/008B23K1/20B23K2103/52
Inventor 亓钧雷王鹏程刘雪峰曹健冯吉才
Owner HARBIN INST OF TECH
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