Method for brazing dissimilar materials through assistance of carbon nano tube sponge middle layer
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A technology of carbon nanotube sponge and dissimilar materials, applied in auxiliary devices, welding equipment, manufacturing tools, etc., can solve problems such as low strength, achieve the effects of enhancing the performance of brazing joints, inhibiting formation and agglomeration, and avoiding agglomeration
Active Publication Date: 2021-02-26
HARBIN INST OF TECH
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[0004] In order to solve the problem of low strength of brazing joints between existing metal materials and dissimilar materials, the present invention proposes a method for assisting brazing of dissimilar materials with a carbon nanotube sponge intermediate layer
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specific Embodiment approach 1
[0027] Specific Embodiment 1: In this embodiment, the method for assisting the brazing of dissimilar materials by the carbon nanotube sponge intermediate layer is carried out according to the following steps:
[0028] Step 1, mixing the carbon nanotube powder with a strong acid solution, and then performing ultrasonic cleaning at a constant temperature of 60°C to obtain a suspension;
[0029] Step 2, disperse the suspension obtained in step 1 into deionized water to obtain a mixed solution, then vacuum filter the mixed solution to obtain a filter cake, then continue to wash the filter cake, and finally peel off the filter cake and filter membrane;
[0030] Step 3, ultrasonically dispersing the obtained filter cake in step 2 into absolute ethanol, centrifuging, and retaining the supernatant;
[0031] Step 4, vacuum filter the supernatant obtained in step 3, peel off to obtain a filter cake, and finally dry to obtain a carbon nanotube sponge;
[0032] Step 5, setting brazing fi...
specific Embodiment approach 2
[0042] Embodiment 2: This embodiment differs from Embodiment 1 in that: the carbon nanotube powder in Step 1 is single-wall carbon nanotubes, double-wall carbon nanotubes or multi-wall carbon nanotubes.
specific Embodiment approach 3
[0043]Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the ratio of the mass of the carbon nanotube powder described in step one to the volume of the strong acid solution is (10-200) mg: (10-30) mL .
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Abstract
The invention relates to a method for brazing dissimilar materials, in particular to a method for brazing dissimilar materials through assistance of a carbon nano tube sponge middle layer and aims atsolving the problem that an existing metal material and dissimilar material brazed joint is low in strength. The method comprises the following steps that carbon nano tubes are mixed with a strong acid solution for ultrasonic cleaning, the obtained solution is dispersed into deionized water, suction filtration is conducted, an obtained filter cake is ultrasonically dispersed into absolute ethyl alcohol, centrifuging is conducted, and a supernatant is obtained; then suction filtration and drying are conducted, and finally brazing is conducted on the dissimilar materials. Or the carbon nano tubes are mixed with the strong acid solution for ultrasonic cleaning, then the obtained solution is dispersed into the deionized water, suction filtration is conducted, the filter cake is ultrasonicallydispersed into the absolute ethyl alcohol, centrifuging is conducted, and the supernatant is obtained; and brazing filler metal powder is added into the supernatant, then suction filtration and dryingare conducted, and finally brazing is conducted on the dissimilar materials. The preparation method of carbon nano tube sponge is simple and low in cost, agglomeration of the carbon nano tubes in thebrazing process can be avoided, and interface structure regulation and control, brazing seam performance enhancement, joint residual stress relief and joint strength improvement are facilitated. Themethod is suitable for brazing the dissimilar materials.
Description
technical field [0001] The invention relates to a method for brazing dissimilar materials. Background technique [0002] The reliable connection of dissimilar materials has always been a hot research direction. The components prepared by multiple materials can realize the complementary advantages of materials, give full play to their respective advantages and performance, and better meet the production needs of modern industry, especially the metal materials and other materials. The welding of dissimilar materials, other dissimilar materials such as ceramics, composite materials, etc., the welding of metal materials and other dissimilar materials can selectively realize the high temperature resistance, wear resistance, corrosion resistance, wave permeability and filter performance of components, thermal conductivity and electrical conductivity sexual performance. However, due to the difference in physical and chemical properties of the base metal to be welded, there will be...
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