Method for actively controlling friction coefficient of metal friction pair in aqueous solution of surfactant

A surfactant and friction coefficient technology, used in non-electric variable control, friction lining, control/regulating systems, etc., can solve the problems of large electric power and lubricant consumption, difficult to meet engineering applications, and achieve the effect of avoiding electrolysis

Inactive Publication Date: 2011-06-22
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But there are also some limitations, including the material of the friction pair is limited to the combination of metal and ceramics, the lubricating fluid is limited to the saturated microemulsion of stearate, the main problem is: the applied voltage is high, reaching 10- 20 volts, which exceeds the electrolysis voltage of the aqueous solution, will cause hydrogen evolution reaction, resulting in a large consumption of electric energy and lubricating fluid. At the same time, the response time of the friction coefficient with the voltage change is tens of seconds, which is difficult to meet the requirements of engineering applications.

Method used

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  • Method for actively controlling friction coefficient of metal friction pair in aqueous solution of surfactant
  • Method for actively controlling friction coefficient of metal friction pair in aqueous solution of surfactant
  • Method for actively controlling friction coefficient of metal friction pair in aqueous solution of surfactant

Examples

Experimental program
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Effect test

example 1

[0042] figure 1 It is a schematic diagram of a friction coefficient active control test device. The graphic marks are described as follows:

[0043] (1) metal disk, (2) ceramic ball, (3) graphite electrode, (4) lubricating fluid, (5) solution tank, (6) angular contact ball bearing, (7) force sensor, (8) electrochemical workstation (DC power supply), (9) adjustable speed motor, (10) lever, (11) weight

[0044] figure 1 The device shown is loaded by means of levers, and can be used for friction and wear tests in the form of ball / disk contact. One side of the friction pair (upper specimen) is ceramic balls (such as silicon nitride, zirconia, alumina) or metal balls 2 (such as Steel ball), the other side is metal (as stainless steel, aluminum alloy, titanium alloy, copper alloy etc.) disc 1. The friction pair is placed in an aqueous solution containing surfactants (such as sodium lauryl sulfate, potassium oleate, sodium stearate, sodium perfluorohexyl sulfonate, cetyltrimethyl...

example 2

[0064] In Example 2, the response of the friction coefficient of the zirconia ceramic / stainless steel friction pair to the control voltage was investigated by means of two electrodes.

[0065] Figure 4 is the experimental result of the friction coefficient changing with the cell voltage under a square wave control voltage. Figure 4 The response of the coefficient of friction of the zirconia / stainless steel friction pair in a two-electrode system to cell voltage control in 1 mM sodium dodecyl sulfate solution is shown. The results show that using the two-electrode control method can obtain similar effects to the three-electrode control method, which can simplify the composition of the control system.

example 3

[0066] Example 3 investigated the response of the coefficient of friction of the zirconia ceramic / stainless steel friction pair along with the series of square wave control potentials (such as Figure 5 shown), the specific implementation steps of the test are as follows:

[0067] The device and method of this group of experiments are the same as those in Example 1, except that the way of applying the control potential is changed to a series of square waves. Figure 5 It shows the response of the friction coefficient of zirconia / stainless steel friction pair to the change of the series square wave control potential in 0.5mM sodium dodecyl sulfate solution. The test results show that the rise and fall of the friction coefficient are almost the same as the change of the control potential Synchronous, its response and recovery time are within 0.5 seconds, which shows that the friction coefficient can follow the continuously changing square wave potential very well.

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Abstract

The invention discloses a method for actively controlling a friction coefficient of a metal friction pair in aqueous solution of a surfactant. A metal side of a sliding friction pair is provided with a working electrode; an inert material with proper area is arranged nearby the friction pair to serve as an auxiliary electrode; the required friction coefficient is controlled actively and acquired by applying a corresponding control electric potential to the sliding friction pair; the sliding friction pair consists of a metal material and a ceramic or metal material; and a lubricant is the aqueous solution of the surfactant. The range and the size of a voltage applied in the method for actively controlling the friction coefficient of the metal friction pair in the aqueous solution of the surfactant can be determined according to a relationship between an electrode electric potential of the working electrode and a bath voltage. The method for actively controlling the friction coefficient of the metal friction pair in the aqueous solution of the surfactant is widely applicable to a friction-driven and friction-braked device and provides technical guarantee for the reliability and the controllability of the device.

Description

technical field [0001] The invention belongs to the field of electromechanical technology, and in particular relates to an active control method for the friction coefficient of a metal friction pair in an aqueous surfactant solution. Background technique [0002] The traditional technology of friction control is mainly realized through the reasonable compatibility and lubrication of friction pair materials. In recent years, some technologies using surface coating and surface topography have also appeared. The limitation of these technologies is that measures can only be taken in the design and manufacturing stages of the friction pair, trying to achieve the expected goal of the actual operation of the friction pair, and cannot realize the real-time and online control of the friction coefficient of the friction pair under the actual working condition. Passive Control Friction Technology. [0003] In order to control the magnitude of the friction coefficient more directly and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16N39/00F16D69/00G05D15/01
Inventor 孟永钢贺四清田煜
Owner TSINGHUA UNIV
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