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Method for reducing friction coefficient by surface finishing

A friction coefficient and surface modification technology, applied in the direction of engine lubrication, engine components, mechanical equipment, etc., can solve the problems of reducing friction coefficient, low silane graft density, thin coating, etc., to achieve good wear reduction effect and practicality strong effect

Inactive Publication Date: 2012-07-25
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Foreign researchers have used the method of modifying the polymer brush on the surface of the friction pair, which can effectively reduce the friction coefficient, but because the preparation of the polymer brush is relatively complicated, the practicability of this method faces some challenges
In addition, some researchers use silane to modify the surface of the friction pair. After the friction pair is cleaned, it is directly modified with silane. Since the surface of the friction pair has not been activated and there are fewer chemical groups available for reaction, the silane modified by this method The grafting density is low, and the coating is thin, which can only reduce the friction coefficient in a short time (about 10min), which limits the practicality

Method used

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  • Method for reducing friction coefficient by surface finishing
  • Method for reducing friction coefficient by surface finishing

Examples

Experimental program
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Effect test

Embodiment 1

[0018] The friction pair was ultrasonically cleaned with acetone, tetrahydrofuran, N,N-dimethylformamide and distilled water for 15 minutes each, and then dried. Then irradiated with ultraviolet for 1.5 h, and applied 10 wt% ethanol solution of perfluorooctyltrichlorosilane to the friction pair and dried at 60°C. Using pure water as lubricant, start the main engine, and the friction pair starts to work. Under the contact pressure of 400MPa, the measured friction coefficient is 0.12 (such as figure 1 In the curve B), and can be maintained for about 3.5 hours. Under the same working conditions, the friction coefficient of the friction pair not modified by this method is 0.65 (such as figure 1 shown in curve A).

Embodiment 2

[0020] The friction pair was ultrasonically cleaned with acetone, tetrahydrofuran, N,N-dimethylformamide, and distilled water for 25 minutes each, and then dried. Then treated with oxygen plasma for 1 h, 5wt% ethanol solution of perfluorooctyltrichlorosilane was coated on the first friction body, and dried at 60°C. , 8 wt% ethanol solution of decyl trichlorosilane was coated on the second friction body, and dried at 40 °C, and the coating was repeated 6 times to make the coating thickness reach 120 nm. Using oil as lubricant, start the main engine, and the friction pair composed of the first friction body and the second friction body starts to work. Under the contact pressure of 340MPa, the measured friction coefficient is 0.03 (such as figure 1 shown in the middle curve C). , and can be maintained for about 5 hours. Under the same working conditions, the friction coefficient of friction pair not modified by this method is 0.73. (such as figure 1 shown in curve A).

Embodiment 3

[0022] The friction pair was ultrasonically cleaned with acetone, tetrahydrofuran, N,N-dimethylformamide, and distilled water for 30 minutes each, and then dried. Then treated with oxygen plasma for 2 hours, 7wt% dodecyltrichlorosilane solution in toluene was coated on the first friction body, and dried at 50°C, and the coating was repeated 4 times to make the coating thickness reach 82nm. The ethanol solution of 10 wt % propyltrichlorosilane was coated on the second friction body, and dried at 40° C., and the coating was repeated 5 times to make the coating thickness reach 114 nm. Using liquid paraffin as lubricant, start the main engine, the friction pair composed of the first friction body and the second friction body starts to work, and the friction coefficient is measured to be 0.05 under the contact pressure of 600MPa (such as figure 1 shown in the middle curve C), and can be maintained for about 7 hours. Under the same working conditions, the friction coefficient of th...

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Abstract

The invention discloses a method for reducing friction coefficient by surface finishing, which belongs to the technical fields of organic chemical grafting finishing and friction-pair surface modification treatment. The method includes: performing surface activating treatment for a friction pair by ultraviolet irradiation or plasmas, coating silane solution on the surface of the friction pair for multiple times for chemical finishing; disposing the friction pair into lubricants required by different working conditions so that the finished friction pair can be lubricated sufficiently; and enabling the friction pair to start operating. The friction coefficient can be simply and conveniently reduced by about one order of magnitude from the original friction coefficient by the method, and further, the fine friction reduction effect in a long time is achieved, and the method can be applied to various friction pair surfaces requiring friction reduction.

Description

technical field [0001] The invention belongs to the technical field of organic chemical graft modification and friction pair surface modification treatment, and particularly relates to a method for reducing friction coefficient through surface modification. Specifically, it involves modifying a coating with a high graft density and a certain thickness on the surface of the friction pair, thereby reducing the friction coefficient by an order of magnitude on the original basis, and helping to reduce the friction between the friction pairs in mechanical motion. technical background [0002] Under the same working conditions, reducing the friction force between the friction pairs during the mechanical movement process, that is, reducing the friction coefficient between the surfaces of the friction pairs, and improving their lubricating performance have always been a concern. The surface property of the friction pair is one of the main factors affecting the friction performance. ...

Claims

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Application Information

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IPC IPC(8): F16N15/00
Inventor 张扬雒建斌
Owner TSINGHUA UNIV
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