A kind of preparation method of copper-graphite-polytetrafluoroethylene composite material

A technology of polytetrafluoroethylene and composite materials, which is applied in the field of powder metallurgy, can solve problems such as limited application range, shallow penetration depth, and poor penetration resistance, and achieve the effects of reducing friction coefficient, increasing service life, and increasing impregnation speed

Active Publication Date: 2020-02-21
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing copper-graphite material impregnating agent is mainly resin, but the range of use of resin-impregnated copper-graphite material is still limited, it cannot be applied to the conditions of strong alkali and strong oxidizing acid, and there are complex processes, shallow penetration depth, and poor permeability resistance And other issues

Method used

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  • A kind of preparation method of copper-graphite-polytetrafluoroethylene composite material
  • A kind of preparation method of copper-graphite-polytetrafluoroethylene composite material
  • A kind of preparation method of copper-graphite-polytetrafluoroethylene composite material

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Embodiment 1

[0036] The invention provides a kind of preparation method of copper-graphite-polytetrafluoroethylene composite material, comprises the following steps:

[0037] (1) be that the purity of 65% is 99.9%, the particle size is less than 300 mesh graphite powder, the volume fraction 30% purity is 99.5%, the particle size is less than 400 mesh electrolytic copper powder, the forming agent (stearin) of volume fraction 5%. Zinc acid) mixed evenly, and then pressed, sintered, and cut to prepare a 20mm×20mm×20mm (length×width×height) copper graphite matrix (Cu-C), figure 1 It is the SEM image of the copper-graphite matrix;

[0038] (2) Put the copper-graphite matrix in acetone and absolute ethanol in turn for 15 minutes and place it in a vacuum drying oven at 80° C. for 0.5 hours, and cool it down to room temperature naturally to obtain a pretreated copper-graphite matrix;

[0039] (3) Put the pretreated copper-graphite matrix into the reaction kettle, add polytetrafluoroethylene dispe...

Embodiment 2

[0044] The invention provides a kind of preparation method of copper-graphite-polytetrafluoroethylene composite material, comprises the following steps:

[0045] (1) be that the purity of 55% by volume fraction is 99.9%, particle size is less than 300 purpose graphite powder, the purity of volume fraction 41% is 99.5%, the particle size is less than 400 purpose electrolytic copper powder, the forming agent (stearin) of volume fraction 4% Zinc acid) mixed uniformly, then pressed, sintered and cut to prepare a 20mm×20mm×20mm (length×width×height) copper-graphite matrix;

[0046] (2) Put the copper-graphite matrix in acetone and absolute ethanol in turn for 15 minutes and place it in a vacuum drying oven at 60° C. for 4 hours, and cool it down to room temperature naturally to obtain a pretreated copper-graphite matrix;

[0047] (3) Put the pretreated copper graphite matrix into the reaction kettle, add polytetrafluoroethylene dispersion, control the liquid level to be 10-20mm highe...

Embodiment 3

[0051] The invention provides a kind of preparation method of copper-graphite-polytetrafluoroethylene composite material, comprises the following steps:

[0052] (1) be that the purity of 56% is 99.9%, particle size is less than 300 mesh graphite powder, the purity of volume fraction 40% is 99.5%, the particle size is less than 400 mesh electrolytic copper powder, the forming agent (stearin) of volume fraction 4% acid zinc) mixed evenly, and then through pressing, sintering, and cutting to prepare a 20mm×20mm×20mm (length×width×height) copper-graphite substrate, image 3 It is the XRD pattern of the copper-graphite matrix. It can be seen from the figure that the copper-graphite matrix only contains Cu phase and C phase, without other impurity phases, and the crystallinity is good;

[0053] (2) Put the copper-graphite substrate in acetone and absolute ethanol in turn for 15 minutes and place it in a vacuum drying oven at 70° C. for 1 hour, and cool it down to room temperature n...

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Abstract

The invention discloses a preparation method of a copper-graphite-polytetrafluoroethylene composite material, and belongs to the technical field of powder metallurgy. The preparation method comprisesthe following steps: (1) a copper graphite substrate is prepared; (2) the copper graphite substrate is sequentially put into acetone and absolute ethyl alcohol for ultrasonic treatment, and after drying, a pretreated copper graphite substrate is obtained; (3) under the high temperature and high pressure, the pretreated copper graphite substrate is immersed into a polytetrafluoroethylene dispersionliquid; and (4) the immersed copper graphite substrate is plasticized at the high temperature, and the copper-graphite-polytetrafluoroethylene composite material is obtained. A polytetrafluoroethylene immersed layer can protect the copper graphite substrate against being corroded and oxidized at the room temperature and in a working state, due to the abrasion resistance and self-lubrication characteristics of polytetrafluoroethylene, a friction coefficient between contact surfaces during workpiece working can be decreased, the abrasion loss is reduced, and the service life of a workpiece is prolonged. The immersing speed of the polytetrafluoroethylene can be increased through high-temperature and high-pressure immersing, multi-time immersing is not needed, one-step in place is achieved, the preparation cycle is shortened, and the production efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and in particular relates to a preparation method of a copper-graphite-polytetrafluoroethylene composite material. Background technique [0002] Copper-graphite composite materials can often be used to manufacture brushes and sliders, mainly used in low-voltage DC motors for automobiles, aviation, and electrical industries, collector rings and commutators for AC asynchronous motors, etc. The carbon brushes and slip rings of the generator are one of the important parts of the motor, and are the key channels for the excitation current of the generator. If they fail, the operation of the entire generator set will be endangered. [0003] In the brush of copper-graphite composite material, the matrix copper and graphite phase play the roles of conducting electricity and improving wear resistance respectively, but in the traditional powder metallurgy process, there is a contradiction between ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L27/18C08K3/04C08K3/08C22C1/05C22C9/00
Inventor 邹俭鹏高杉
Owner CENT SOUTH UNIV
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