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Method for efficiently preparing graphene-reinforcing copper-based composite brazing filler metal at low temperature

A copper-based composite and graphene technology, applied in manufacturing tools, welding equipment, metal processing equipment, etc., can solve the problems of poor graphene dispersion, high preparation temperature, and many surface defects, achieve uniform quality dispersion, and reduce preparation temperature. , the effect of the simple method

Active Publication Date: 2014-05-28
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention solves the problems of poor graphene dispersion, many surface defects, high preparation temperature and low efficiency when preparing graphene-reinforced cop

Method used

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  • Method for efficiently preparing graphene-reinforcing copper-based composite brazing filler metal at low temperature
  • Method for efficiently preparing graphene-reinforcing copper-based composite brazing filler metal at low temperature
  • Method for efficiently preparing graphene-reinforcing copper-based composite brazing filler metal at low temperature

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Example Embodiment

[0019] Specific implementation manner 1: The method for preparing graphene-reinforced copper-based composite brazing filler metal at low temperature and efficiently described in this embodiment is specifically performed according to the following steps:

[0020] 1. Place the copper powder in a plasma-enhanced chemical vapor deposition vacuum device, evacuate to a pressure below 5Pa, and pass hydrogen gas at a gas flow rate of 18sccm-22sccm, adjust the vacuum speed to put the plasma-enhanced chemical vapor deposition vacuum device The pressure is controlled at 190Pa~210Pa, and the temperature is raised to 500℃~700℃ within 40min under the pressure of 190Pa~210Pa and hydrogen atmosphere, and the temperature is 500℃~700℃ for 25min~35min;

[0021] 2. Pass in argon and carbon source gas, adjust the hydrogen gas flow rate to 40sccm, argon gas flow rate to 80sccm, and carbon source gas gas flow rate to 1sccm~8sccm, and adjust the vacuuming speed to make the plasma enhanced chemical vapor de...

Example Embodiment

[0027] Specific embodiment two: this embodiment is different from specific embodiment one in that the purity of the copper powder described in step one is 99%-99.99%, and the particle diameter is 100nm-100μm. Others are the same as the first embodiment.

Example Embodiment

[0028] Specific embodiment three: This embodiment is different from one of specific embodiments one or two in that the carbon source gas described in step two is methane. Others are the same as the first or second embodiment.

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Abstract

The invention relates to a method for preparing graphene-reinforcing copper-based composite brazing filler metal, in particular to a method for efficiently preparing the graphene-reinforcing copper-based composite brazing filler metal at a low temperature. The method aims to solve the problems that during preparation of the graphene-reinforcing copper-based composite brazing filler metal through a traditional method, the dispersibility of graphene is poor, the number of surface defects is large, the preparation temperature is high, and efficiency is low. The method comprises the steps that firstly, copper powder is placed in a plasma-reinforcing chemical vapor deposition vacuum device, hydrogen is fed into the vacuum device, and the temperature is maintained at a high temperature; secondly, argon and carbon source gas are fed into the vacuum device for deposition, and after deposition is over, feeding of the carbon source gas is stopped; finally, cooling is conducted until the temperature reaches the room temperature, so that grapheme/copper composite powder is obtained, next, metal powder or alloy power is evenly mixed with the grapheme/copper composite powder, and then the graphene-reinforcing copper-based composite brazing filler metal is obtained. The method is used for efficiently preparing the graphene-reinforcing copper-based composite brazing filler metal at a low temperature.

Description

technical field [0001] The invention relates to a method for preparing graphene-reinforced copper-based composite solder. Background technique [0002] Brazing is one of the three major welding methods (fusion welding, pressure welding, and brazing). It mainly uses metal materials with a lower melting point than the base metal as the solder, and heats the weldment and the solder to a temperature higher than the melting point of the solder. Below the melting temperature of the base metal, the liquid solder is used to wet the base metal, fill the joint gap and diffuse with the base metal to realize the connection of the weldment. It is widely used in many fields such as machinery, electrical machinery, instrumentation, and electronic technology. The strength, hardness, heat resistance, corrosion resistance and other performance indicators of the brazed joint are directly related to the solder. Adding reinforcements such as particles, fibers, and layers to the solder can effec...

Claims

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Application Information

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IPC IPC(8): B23K35/40
CPCB23K35/0244B23K35/302C23C16/26C23C16/4417
Inventor 亓钧雷张天琪张丽霞曹健冯吉才
Owner HARBIN INST OF TECH
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