Method for connecting high-strength graphite with copper alloy

A technology of high-strength graphite and connection method, applied in welding medium, welding equipment, metal processing equipment, etc., can solve the problems of sample size limitation, high connection temperature, expensive equipment, etc., to achieve low connection cost, high strength, and easy implementation. Effect

Inactive Publication Date: 2013-07-31
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantages of solid phase diffusion connection are high connection strength, good air tightness of joint, small shrinkage and deformation, and easy control of size. Specimen size is limited

Method used

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  • Method for connecting high-strength graphite with copper alloy
  • Method for connecting high-strength graphite with copper alloy
  • Method for connecting high-strength graphite with copper alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Apply the method provided by the invention to connect high-strength graphite (its bending strength is 40MPa) and CuCrZr alloy

[0034] Due to the poor wettability of CuCrZr alloy with high-strength graphite at high temperature, the preparation of joints is difficult.

[0035] The connection process of the high-strength graphite provided by the invention and the copper alloy is as follows:

[0036] (A) pretreatment of the connection end face of high-strength graphite 1 and CuCrZr alloy 2;

[0037] Grind and polish the connection end face of high-strength graphite and CuCrZr alloy, clean it with ultrasonic waves for 20 minutes, then dry it for use;

[0038] (B) Preparation of solder;

[0039] Selecting Cu powder and Ti powder with a particle diameter of micron order, the particle diameters of the Cu powder and Ti powder are both 15-50 μm, mixing the Cu powder and the Ti powder, wherein the mass percentage of the Ti powder is 45%; The mixed powder was mixed in alcohol w...

Embodiment 2

[0047] Application of the method provided by the present invention to prepare high-strength graphite and red copper connectors in the new commutator of automobiles

[0048] The connection process of the high-strength graphite provided by the invention and the red copper is as follows:

[0049] (A) Pretreatment of high-strength graphite and copper connection end faces;

[0050] Grind and polish the connecting end face of high-strength graphite and copper, clean it with ultrasonic waves for 25 minutes, then dry it for use;

[0051] (B) Preparation of solder;

[0052] Selecting Cu powder and Ti powder with a particle diameter of micron order, the particle diameters of the Cu powder and Ti powder are both 15-50 μm, mixing the Cu powder and the Ti powder, wherein the mass percentage of the Ti powder is 50%; The mixed powder was mixed in alcohol with ultrasonic vibration for 30min. In order to avoid stratification due to different powder densities, it should be stirred at any time ...

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Abstract

The invention relates to a method for connecting high-strength graphite with copper alloy. The method comprises the steps as follows: (A) grinding and buffing the connection end surfaces of the high-strength graphite and the copper alloy, ultrasonically cleaning, and drying for use; (B) mixing Cu powder with Ti powder to obtain mixed powder, mixing by ultrasonic vibration in alcohol, stirring at any time, drying, and pouring into a mortar for grinding; and (C) carrying out cold pressure forming on the mixed powder on a sheet pressing machine to obtain welding flux pressed blanks, placing the welding flux pressed blanks on the connection end surfaces or directly applying the mixed powder prepared from the step (B) onto the connection end surfaces, stacking the two connection end surfaces, placing the stacked connection end surface into a vacuum furnace, applying a pressure, heating, cooling to room temperature along with the furnace, taking out, and finishing the connection between the high-strength graphite and the copper alloy. The method has the following main advantages: (1) the obtained connector is high in strength; (2) the method has the advantages of simplicity for operation, high possibility of implementation and the like; and (3) the method is low in connection cost.

Description

technical field [0001] The invention belongs to the technical field of carbon-based materials, and relates to a connection method of high-strength graphite and copper alloy, in particular to an effective connection method for preparing high-strength graphite and copper alloy connectors. Background technique [0002] Graphite materials, especially high-strength graphite, have the characteristics of light weight, high specific strength, heat resistance, corrosion resistance, good electrical and thermal conductivity, and excellent thermal shock resistance, and are widely used in the aerospace industry and the nuclear industry. When high-strength graphite is used as a plasma-facing material in nuclear fusion, it needs to be connected with a high thermal conductivity copper heat sink to conduct the heat deposited on its surface. In addition, it is also necessary to connect graphite and copper in the new commutator of automobiles. [0003] At present, the connection technologies ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/008B23K1/19B23K35/24
Inventor 毛样武聂敦伟晏倩
Owner WUHAN INSTITUTE OF TECHNOLOGY
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