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Graphite/Cu alloy connector and preparation method thereof

A technology of alloy and graphite, which is applied in the field of graphite/Cu alloy joints and its preparation, can solve problems such as poor wettability, achieve enhanced compatibility, be beneficial to industrial applications, and have good economic benefits

Inactive Publication Date: 2017-11-24
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The connecting layer of the graphite / Cu alloy joint has a good bonding interface, and its preparation method not only improves the problem of poor wettability of the copper alloy on the graphite surface, but also alleviates the residual thermal stress caused by the large difference in thermal expansion coefficient between graphite and copper alloy , and the preparation process is simple

Method used

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  • Graphite/Cu alloy connector and preparation method thereof
  • Graphite/Cu alloy connector and preparation method thereof
  • Graphite/Cu alloy connector and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Using Cu-TiH 2 -Ni / Cu / Ag-Cu composite solder to prepare graphite / CuCrZr alloy joints, the specific steps are as follows:

[0036] 1. Weigh Cu and TiH with a mass ratio of 60:30:10 2 , Ni three powders, and mix them evenly, add alcohol and grind until the alcohol is completely volatilized, and Cu-TiH 2 -Ni mixed powder solder.

[0037] 2. Sand the Ag-Cu foil with a thickness of 100 μm (the mass percentage of Ag is 72%, and the mass percentage of Cu is 28%) and Cu foil with sandpaper to remove the oxide on the surface, and then put it into alcohol for ultrasonic Wash for 30 minutes.

[0038] 3. Grind the end faces of graphite and CuCrZr alloy to be connected step by step with metallographic sandpaper, then put them into an ultrasonic cleaning machine for cleaning for 30 minutes, and then dry them with a hair dryer for later use.

[0039] 4. Take an appropriate amount of Cu-TiH prepared in step 1 2 -Ni mixed powder solder, add a small amount of absolute ethanol and gl...

Embodiment 2

[0050] To prepare graphite / copper joints, the specific steps are as follows:

[0051] 1. Weigh Cu and TiH with a mass ratio of 70:22:8 2 , Ni three powders, and mix them evenly, add alcohol and grind until the alcohol is completely volatilized, and Cu-TiH 2 -Ni mixed powder solder.

[0052] 2. Sand the Ag-Cu foil with a thickness of 100 μm (the mass percentage of Ag is 72%, and the mass percentage of Cu is 28%) and Cu foil with sandpaper to remove the oxide on the surface, and then put it into alcohol for ultrasonic Wash for 30 minutes.

[0053] 3. Grind the end faces of graphite and copper to be connected step by step with metallographic sandpaper, then put them into an ultrasonic cleaning machine for cleaning for 30 minutes, and then dry them with a hair dryer for later use.

[0054] 4. Take an appropriate amount of Cu-TiH prepared in step 1 2 -Ni mixed powder solder, add a small amount of absolute ethanol and glycerol to make a viscous paste solder, then evenly coat the...

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Abstract

The invention discloses a graphite / Cu alloy connector and a preparation method thereof. A connection layer of the graphite / Cu alloy connector is of a sandwich type composite structure and comprises a Cu-TiH2-Ni layer connected with graphite, an Ag-Cu layer connected with Cu alloy, and a Cu layer located between the Cu-TiH2-Ni layer and the Ag-Cu layer. The preparation method of the graphite / Cu alloy connector comprises the following steps that (1) Cu powder, TiH2 powder and Ni powder are uniformly mixed and added with ethyl alcohol to be ground, so that Cu-TiH2-Ni mixed powder solder is obtained; (2) an appropriate amount of the Cu-TiH2-Ni mixed powder solder is taken and added with a little of absolute ethyl alcohol and glycerol drop by drop, so that thick cream solder is prepared; and (3) the cream solder is evenly smeared on the surface of the graphite, then, Cu foil and Ag-Cu foil are put on the cream solder in sequence, finally the Cu alloy is put, the mixture is overall put into a mold, and the connector is obtained after brazing. The graphite / Cu alloy connector prepared through the method is good in interface bonding and high in connection strength, and the problems that the wettability of copper on the surface of the graphite is poor, and residual thermal stress occurs due to the large thermal expansion coefficient difference between the graphite and the copper alloy are solved.

Description

technical field [0001] The invention belongs to the technical field of connection of dissimilar materials, and relates to a graphite / Cu alloy joint and a preparation method thereof. Background technique [0002] In recent years, in order to reform the energy structure and control vehicle emission pollution, my country has promoted the use of ethanol gasoline for vehicles. However, ethanol gasoline will accelerate the corrosion of the copper surface in contact with the brushes in the car commutator, which will reduce the service life of the fuel pump. Therefore, the automobile industry urgently needs to develop a commutator suitable for use in ethanol gasoline. Carbon materials have the advantages of stable chemical properties, high self-lubricating coefficient, small frictional resistance, high strength at high temperatures, and are not prone to electric sparks. They can effectively slow down friction loss and corrosion when used in the parts of the commutator that are in c...

Claims

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Application Information

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IPC IPC(8): B23K1/00B23K1/20B23K1/19
Inventor 毛样武彭少学彭良荥段煜邓泉荣
Owner WUHAN INSTITUTE OF TECHNOLOGY
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