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a kind of ceo 2 Modified nano ag whisker doped graphene film and preparation method thereof

A graphene thin film and nano technology, applied in the direction of metal material coating process, coating, surface pretreatment, etc., can solve the problems of graphene unsuitable for application, poor resistance to arc ablation, decreased hardness and wear resistance, etc. , to achieve excellent electrical conductivity, improve electrical and thermal conductivity and high temperature wear resistance, improve the effect of ablation resistance

Active Publication Date: 2021-02-26
NANJING INST OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the poor microstructure stability of the Ag whiskers and the film layer at high temperatures, the hardness and wear resistance decrease rapidly, and a series of shortcomings such as poor arc ablation resistance under the condition of carrying current.
Therefore, the existing Ag whiskers and film-doped graphene are not suitable for use in high-speed train motor rotor friction discs

Method used

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  • a kind of ceo <sub>2</sub> Modified nano ag whisker doped graphene film and preparation method thereof
  • a kind of ceo <sub>2</sub> Modified nano ag whisker doped graphene film and preparation method thereof
  • a kind of ceo <sub>2</sub> Modified nano ag whisker doped graphene film and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] a CeO 2 The preparation method of modified nano Ag whisker-doped graphene film, comprises the following steps:

[0035] In step (1), the copper alloy used for high-speed train carbon brushes and motor rotor friction discs is used as the substrate and pretreated, and then surface pretreatment is carried out. The surface pretreatment includes removal of oxide film, metallographic grinding, polishing and cleaning; cleaning After finishing, the surface is dried for standby; the cleaning is to adopt ultrasonic cleaning, the cleaning time is 20min, and the cleaning medium is acetone; the method for removing the oxide film is the method of using a grinder; the metallographic polishing is to use multiple metallographic sandpaper Grinding; the polishing agent used during the polishing is a nano-diamond paste;

[0036] Step (2), take by weighing 1 weight part of cerous nitrate, add to the deionized water of 100 weight parts, obtain solution, then add citric acid complexing agent...

Embodiment 2

[0042] a CeO 2 The preparation method of modified nano Ag whisker-doped graphene film, comprises the following steps:

[0043] In step (1), the copper alloy used for high-speed train carbon brushes and motor rotor friction discs is used as the substrate and pretreated, and then surface pretreatment is carried out. The surface pretreatment includes removal of oxide film, metallographic grinding, polishing and cleaning; cleaning After finishing, the surface is dried for later use; the cleaning is ultrasonic cleaning, the cleaning time is 40min, and the cleaning medium is acetone; the method for removing the oxide film is a cutting method; the metallographic grinding is for grinding with multiple metallographic sandpaper; The polishing agent used during the polishing is a nano-diamond paste;

[0044] Step (2), take by weighing 5 parts by weight of cerous nitrate, add to the deionized water of 120 parts by weight, obtain solution, then add citric acid complexing agent and polyeth...

Embodiment 3

[0050] a CeO 2 The preparation method of modified nano Ag whisker-doped graphene film, comprises the following steps:

[0051] In step (1), the copper alloy used for high-speed train carbon brushes and motor rotor friction discs is used as the substrate and pretreated, and then surface pretreatment is carried out. The surface pretreatment includes removal of oxide film, metallographic grinding, polishing and cleaning; cleaning After the surface is dried, it is ready for use;

[0052] Step (2), take by weighing 1 weight part of cerous nitrate, add to the deionized water of 120 weight parts, obtain solution, then add citric acid complexing agent and polyethylene glycol dispersant, the mol ratio of citric acid and Ce ion The molar ratio of polyethylene glycol to Ce ions is 1:1, and the molar ratio of polyethylene glycol to Ce ions is 2:1. After stirring and dissolving, fully stir and mix in a water bath at 90°C to form a gel;

[0053] In step (3), 20 parts by weight of nano-Ag ...

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Abstract

The invention discloses a CeO 2 The preparation method of modified nano-Ag whisker-doped graphene film comprises the following steps: step (1), pretreatment of substrate; step (2), preparation of cerous nitrate gel; step (3), containing nitrite Preparation of cerium and nano-Ag whisker gel suspension; step (4), CeO 2 Preparation of modified nano-Ag whisker porous membrane; step (5), CeO 2 Reduction preparation of modified nano-Ag whisker-doped graphene oxide composite film; step (6), heat treatment of graphene film. The invention also discloses the CeO obtained by the above preparation method 2 Modified nano-Ag whiskers doped graphene films. The present invention introduces CeO on the surface of high-speed train carbon brushes and motor rotor copper alloy friction discs 2 Rare earth oxide-modified Ag whisker-doped graphene film not only maintains the excellent electrical and thermal conductivity of the friction disc, but also improves its resistance to current-carrying wear and arc ablation.

Description

technical field [0001] The present invention relates to a CeO 2 A modified nano-Ag whisker-doped graphene film and a preparation method thereof belong to the field of material technology. Background technique [0002] At this stage, high-speed trains have become the mainstream of the railway industry, and high-power electric traction systems have become the driving force of high-speed trains. The industries related to high-speed rail are developing rapidly and growing stronger day by day. As the key parts of the high-speed train traction motor rotor friction disc parts, the localization has been gradually realized. In the traction transmission system, the carbon brushes of high-speed trains and the friction discs of motor rotors are mainly made of copper alloys with good electrical conductivity and wear resistance. However, the carbon brushes and motor rotor friction discs of high-speed trains will produce serious heating and arc ablation when they work under long-term cur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B05D7/14B05D7/24B05D5/08B05D5/12B05D3/00B05D3/02C23C18/12
CPCB05D3/002B05D3/007B05D3/0209B05D3/0272B05D5/08B05D5/12B05D7/14B05D7/24B05D2202/45C23C18/1216C23C18/1254C23C18/127
Inventor 张保森张超王章忠朱帅帅巴志新陶学伟巨佳卢镔卢稳舟
Owner NANJING INST OF TECH
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