A method for assisting brazing of carbon nanotube reinforced three-dimensional structure intermediate layer

A technology of carbon nanotubes and three-dimensional structures, applied in the field of brazing ceramics and metals, can solve problems such as insufficient high-temperature performance and large residual stress, and achieve the effects of improving high-temperature performance, relieving residual stress, and relieving residual stress

Inactive Publication Date: 2019-02-19
哈尔滨工大特种连接高新科技发展股份有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to solve the problems of relatively large residual stress and insufficient high-temperature performance in the brazing connection of existing ceramic materials and metals, and provides a method for assisting brazing of a carbon nanotube-reinforced three-dimensional structure intermediate layer

Method used

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  • A method for assisting brazing of carbon nanotube reinforced three-dimensional structure intermediate layer

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specific Embodiment approach 1

[0022] Embodiment 1: A method for assisting brazing of a carbon nanotube-reinforced three-dimensional structure intermediate layer described in this embodiment is carried out in accordance with the following steps:

[0023] 1. Wash the metal foam with hydrochloric acid, acetone, absolute ethanol and deionized water with a concentration of 1mol / L-3mol / L for 10 minutes, and then dry it naturally to obtain the pretreated metal foam. Add the catalyst to the In water ethanol, obtain the dehydrated ethanol solution of the catalyst with the concentration of 0.001mol / L~1mol / L, impregnate the foam metal after pretreatment in the dehydrated ethanol solution of the catalyst with the concentration of 0.001mol / L~1mol / L , let stand for 1h, and then dry naturally to obtain the foamed metal after soaking;

[0024] 2. Place the soaked metal foam in a plasma-enhanced chemical vapor deposition vacuum device, evacuate until the pressure is below 20Pa~100Pa, pass in hydrogen gas, adjust the flow r...

specific Embodiment approach 2

[0036] Embodiment 2: This embodiment is different from Embodiment 1 in that the metal foam described in step 1 is copper foam or nickel foam. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0037] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the catalyst described in step 1 is nickel nitrate hexahydrate, iron nitrate, cobalt nitrate, nickel sulfate, iron sulfate or cobalt sulfate. Others are the same as in the first or second embodiment.

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Abstract

The invention discloses a method for assisting brazing by a carbon nanotube reinforced type three-dimensional middle layer, and relates to a method for brazing ceramic and metal, which aims at solving the problems of larger residual stress and insufficient high-temperature property in the existing ceramic and metal brazing connection process. The method comprises the following steps of 1, preparing soaked foam metal; 2, putting the soaked foam metal into a plasma reinforced type chemical vapor depositing vacuum device, and increasing temperature at certain pressure and hydrogen atmosphere; 3, preparing nanotube reinforced type foam metal; 4, preparing surface impurity-removed metal, surface impurity-removed brazing material foil and surface impurity-removed ceramic; 5, sequentially overlapping the surface impurity-removed to-be-brazed metal, the carbon nanotube reinforced type foam metal, the surface impurity-removed brazing material foil and the surface impurity-removed ceramic, so as to obtain a to-be-brazed part; brazing the to-be-brazed part, and cooling to room temperature. The method disclosed by the invention is used for assisting the brazing by the carbon nanotube reinforced type three-dimensional middle layer.

Description

technical field [0001] This invention relates to methods of brazing ceramics and metals. Background technique [0002] Ceramic materials are currently the materials with the best rigidity and highest hardness among engineering materials. At the same time, the coefficient of linear expansion of ceramics is lower than that of metals. When the temperature changes, ceramics have good dimensional stability; ceramic materials generally have high melting points (mostly at Above 2000℃), it is not easy to oxidize at high temperature, and has good corrosion resistance to acid, alkali and salt, has stable corrosion resistance, and its thermal conductivity is lower than that of metal materials, it is a good heat insulation material, ceramics have Many excellent high temperature performance. Ceramics can be divided into a variety of functional ceramics according to their production methods, and have been widely used in aerospace, energy transportation, power electronics, biomedicine, ch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K1/20B23K1/008
CPCB23K1/008B23K1/20B23K1/206
Inventor 亓钧雷霸金王毅恒林景煌金宇鹏冯吉才
Owner 哈尔滨工大特种连接高新科技发展股份有限公司
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