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Method for improving friction performance of graphite material and preparation process

A technology for friction performance and graphite materials, which is applied in the field of improving the friction performance of graphite materials, can solve problems such as poor friction performance and complicated graphite impregnation process, and achieve the effects of improving temperature resistance, reducing friction coefficient and improving mechanical properties

Pending Publication Date: 2021-09-17
BEIJING UNIV OF CHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the shortcomings of the existing graphite impregnation process complex and poor friction performance in high temperature environment, to provide an economical and simple preparation method for improving the friction performance of graphite materials at high temperature

Method used

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  • Method for improving friction performance of graphite material and preparation process
  • Method for improving friction performance of graphite material and preparation process
  • Method for improving friction performance of graphite material and preparation process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Prepare boric acid impregnation solution. The solution can be distilled water, absolute ethanol, etc., preferably absolute ethanol. The mass ratio of boric acid powder to absolute ethanol is 1:5, and it is configured as a boric acid-absolute ethanol supersaturated solution as an impregnation solution;

[0030] (2) Pretreatment of graphite flakes. Clean the surface of the graphite flakes, and dry the graphite flakes in an incubator at a drying temperature of 80°C for 2 hours;

[0031] (3) Impregnated graphite flakes. Place the pretreated graphite flakes in the impregnation kettle, and then pour the boric acid-absolute ethanol supersaturated impregnation solution into the impregnation kettle, so that the graphite flakes are completely submerged. After stirring evenly, keep the distance between the graphite flakes at 5 More than mm, impregnated for 24h;

[0032] (4) Evaporate the impregnation solution. Under normal pressure, keep the temperature in the kettle at 55...

Embodiment 2

[0035] (1) Prepare boric acid impregnation solution. The solution can be distilled water, absolute ethanol, etc., preferably absolute ethanol. The mass ratio of boric acid powder to absolute ethanol is 1:5, and it is configured as a boric acid-absolute ethanol supersaturated solution as an impregnation solution;

[0036] (2) Pretreatment of graphite flakes. Clean the surface of the graphite flakes, and dry the graphite flakes in an incubator at a drying temperature of 80°C for 2 hours;

[0037] (3) Impregnated graphite flakes. Place the pretreated graphite flakes in the impregnation kettle, and then pour the boric acid-absolute ethanol supersaturated impregnation solution into the impregnation kettle, so that the graphite flakes are completely submerged. After stirring evenly, keep the distance between the graphite flakes at 5 More than mm, impregnated for 24h;

[0038] (4) Evaporate the impregnation solution. Under normal pressure, keep the temperature in the kettle at 55...

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Abstract

The invention discloses a method capable of improving the friction and wear performance of a graphite material, especially the high-temperature friction and wear performance. According to the technical scheme, the boric acid impregnant is fully impregnated into pores of the graphite material by using the cheap deionized water or the alcohol solution as the dispersion liquid, so that the structural strength and the impact resistance of the graphite material are improved, and the tribological performance is greatly improved. The impregnation process is economical and simple in impregnation process, can be carried out at normal temperature and normal pressure, has low requirements on equipment and has a better multi-time impregnation effect. Compared with non-impregnated graphite, the one-time impregnated graphite has the advantages that the grinding crack width is reduced by 6.5%, and the friction coefficient is reduced by 13.5%; compared with industrial impregnated resin graphite M106K, the grinding crack width of the three-time impregnated graphite is reduced by 36.8%, and the friction coefficient is reduced by 41.6%; and compared with industrial impregnated antimony graphite M106D, the grinding crack width of the three-time impregnated graphite is slightly increased, but the friction coefficient is reduced by 32.3%. Compared with a traditional impregnation process, the method provided by the invention is more economical and simpler, is reliable in friction performance, and can be applied to mechanical sealing in the fields of spaceflight, chemical engineering, ships and the like.

Description

technical field [0001] The invention belongs to the technical field of chemical engineering, and in particular relates to a method for improving the friction performance of graphite materials and a preparation method thereof. Background technique [0002] Graphite is used as a sealing ring material in mechanical seals due to its close-packed space structure, low density, high temperature resistance, self-lubrication, and corrosion resistance. The mechanical seal is a rotary face seal, which is widely used in various rotating equipment such as pumps, compressors, and kettles. The sealing end face has relative friction while performing the sealing function, and due to different application occasions, the frictional conditions of the sealing end face are also complex and changeable, such as high temperature and high load conditions. At the same time, the friction of the mechanical seal ring of rotating shaft equipment is very frequent, and the friction performance of the end f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/85
CPCC04B41/85C04B41/5006C04B41/009C04B41/4535C04B41/0072C04B35/522
Inventor 赵军刘登宇李双喜何永勇刘益江陈潇竹
Owner BEIJING UNIV OF CHEM TECH