CN112875676B - Method for inducing low friction and abrasion of amorphous carbon film by horizontal electrons - Google Patents
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Abstract
The invention discloses a method for horizontally electronically inducing low friction and wear of an amorphous carbon film, which comprises the following steps: friction movement is carried out on the surface of the amorphous carbon film by adopting a friction piece; applying an electric field parallel to a surface of the amorphous carbon film during the rubbing movement to reduce rubbing abrasion of the amorphous carbon film; wherein the direction of the rubbing movement has a component parallel to the direction of the electric field. By applying an electric field parallel to the surface of the amorphous carbon film and performing friction motion on the surface of the amorphous carbon film, a small amount of graphene nanocrystals are formed in a grinding mark area on the surface of the amorphous carbon film, the resistance of the grinding mark area is reduced, and the conductivity is increased, so that electrons are converged to the grinding mark area to form large graphene nanocrystals which are parallel to the friction direction, the friction coefficient of the grinding mark area is reduced by one order of magnitude, and meanwhile, the maintenance time of the low friction characteristic of the graphene nanocrystals is longer, so that the graphene nanocrystals have good wear resistance.
Description
Technical Field
The invention relates to the field of nano tribology, in particular to a method for inducing low friction and abrasion of an amorphous carbon film by horizontal electrons.
Background
With the development of thin film technology and nano tribology technology, tribological properties of nano carbon films with amorphous and graphene nanocrystalline structures have been widely studied by students at home and abroad, wherein the amorphous carbon film is a very commonly used solid lubricating coating material, because it has excellent mechanical, electrical, magnetic and tribological properties, especially the tribological properties of high hardness and low friction coefficient, have been successfully applied to working surfaces of parts such as pantographs, magnetic disk protection and cutters. In recent years, the basic research on the low friction of amorphous carbon film surfaces has been greatly advanced, and low friction coefficient levels of 0.01-0.001 have been achieved in special environments (vacuum, inert gas) or under ideal conditions (sliding between scanning probe and two-dimensional layered structure material). However, in the atmospheric environment, it is also difficult to achieve low friction between the amorphous carbon film and the metal or ceramic interface. Although many domestic and foreign scientists have conducted scientific experiments and researches to find some effective methods for manually controlling friction and wear, such as controlling friction and wear by means of voltage, different magnetic field conditions, different atmosphere working environments, changing materials in contact with each other, etc., it is difficult to realize a method having both low friction coefficient and high wear resistance.
Accordingly, the prior art is still in need of improvement and development.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, it is an object of the present invention to provide a method for horizontal electron-induced low friction wear of an amorphous carbon film, which aims to simultaneously reduce the friction coefficient and wear of the amorphous carbon film during friction.
The technical scheme of the invention is as follows:
a method of horizontal electron induced low friction wear of an amorphous carbon film, comprising:
friction movement is carried out on the surface of the amorphous carbon film by adopting a friction piece;
applying an electric field parallel to a surface of the amorphous carbon film during the rubbing movement to reduce rubbing abrasion of the amorphous carbon film;
wherein the direction of the rubbing movement has a component parallel to the direction of the electric field.
The horizontal electron induces low friction and abrasion of the amorphous carbon film, wherein the direction of the current of the electric field is parallel to the direction of the friction movement.
The method for horizontally inducing the low friction and abrasion of the amorphous carbon film by electrons comprises the following steps of applying an electric field parallel to the surface of the amorphous carbon film to the amorphous carbon film:
preparing an amorphous carbon film on an insulating substrate, and cleaning the surface of the amorphous carbon film;
preparing a first electrode and a second electrode at two ends of the surface of the amorphous carbon film after the cleaning treatment;
and determining an electric field parameter, and electrically connecting the first electrode with the second electrode according to the electric field parameter so as to apply an electric field parallel to the surface of the amorphous carbon film.
The method for inducing low friction and abrasion of the amorphous carbon film by the horizontal electrons comprises the step of adjusting the electric power of the amorphous carbon film through the electric field parameters, wherein the electric field parameters are the voltage value and/or the current value of the amorphous carbon film.
The horizontal electron induces the low friction and wear of the amorphous carbon film, wherein the electric power of the amorphous carbon film is not more than 5.5W.
The horizontal electron induced amorphous carbon film low friction abrasion method comprises the step of forming an insulating substrate, wherein the insulating substrate is a silicon oxide substrate.
The horizontal electron induced amorphous carbon film low friction wear method, wherein the material of the friction piece is selected from one of metal materials or ceramic materials.
The method for inducing the low friction and abrasion of the amorphous carbon film by the horizontal electrons comprises the following steps of:
cleaning the friction piece, and fixing the cleaned friction piece on a friction device;
and determining a friction motion parameter, and controlling the friction device according to the friction motion parameter to enable the friction piece to perform friction motion on the surface of the amorphous carbon film.
The horizontal electron induced amorphous carbon film low friction wear method is characterized in that the friction motion parameters are sliding speed, friction stroke and friction piece load.
The horizontal electron induced amorphous carbon film low friction wear method is characterized in that the friction piece load is 1-5N, the sliding speed is 0-120 mm/s, and the friction stroke is 0-50 mm.
The beneficial effects are that: the invention provides a method for horizontally electronically inducing low friction and wear of an amorphous carbon film, which comprises the following steps: friction ball is adopted to carry out friction movement on the surface of the amorphous carbon film; applying an electric field parallel to a surface of the amorphous carbon film during the rubbing movement to reduce rubbing abrasion of the amorphous carbon film; wherein the direction of the rubbing movement has a component parallel to the direction of the electric field. By applying an electric field parallel to the surface of the amorphous carbon film and performing friction motion on the surface of the amorphous carbon film, a small amount of graphene nanocrystals are formed in a grinding mark area on the surface of the amorphous carbon film, the resistance of the grinding mark area is reduced, and the conductivity is increased, so that electrons are converged to the grinding mark area to form large graphene nanocrystals which are parallel to the friction direction, the friction coefficient of the grinding mark area is reduced by one order of magnitude, and meanwhile, the maintenance time of the low friction characteristic of the graphene nanocrystals is longer, so that the graphene nanocrystals have good wear resistance.
Drawings
FIG. 1 is a schematic flow chart of a method for horizontal electron induced low friction and wear of amorphous carbon films according to the present invention.
FIG. 2 is a schematic diagram of a horizontal electron induced low friction wear of amorphous carbon films according to the present invention.
Fig. 3 is a schematic structural view of the friction device of the present invention.
Fig. 4 is a graph showing the change of friction coefficient corresponding to different levels of electric power.
Fig. 5 is a graph showing a change in friction coefficient after 2000 cycles of friction movement at electric powers of 0W and 3.6W.
FIG. 6 is a Raman spectrum of the wear scar region of the amorphous carbon film before and after rubbing.
Detailed Description
The invention provides a method for inducing low friction and abrasion of an amorphous carbon film by horizontal electrons, which is used for making the purposes, technical schemes and effects of the invention clearer and more definite, and is further described in detail below. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1 to 3, the present invention provides a method for low friction and wear of a horizontal electron-induced amorphous carbon film 11, comprising:
s10, friction movement is carried out on the surface of the amorphous carbon film 11 by adopting a friction piece;
s20, applying an electric field parallel to the surface of the amorphous carbon film 11 to reduce friction and abrasion of the amorphous carbon film 11 during the friction and movement process; wherein the direction of the rubbing movement has a component parallel to the direction of the electric field.
Specifically, referring to fig. 2, by applying an electric field parallel to the surface of the amorphous carbon film 11 and performing a rubbing motion on the surface of the amorphous carbon film 11, the present invention induces the conversion of sp3 bonds in the carbon film to sp2 bonds, so that a small amount of graphene nanocrystals are formed at the grinding mark region on the surface of the amorphous carbon film 11, the resistance of the grinding mark region is reduced, the conductivity is increased, and thus electrons are converged to the grinding mark region, the electron density of the grinding mark region is increased, so that the grinding mark region forms large sheets and the graphene nanocrystals parallel to the rubbing direction, and the friction coefficient is reduced. In addition, if the friction direction is completely perpendicular to the electric field direction, electrons directly pass through the grinding mark area and cannot be converged, the electron density of the grinding mark area is not changed, and the grinding mark area cannot form large graphene nanocrystalline, so that the effect of reducing the friction coefficient of the grinding mark area is not achieved, and therefore, the direction of friction movement needs to have a component parallel to the electric field direction. The friction method of the invention can reduce the friction coefficient of the grinding mark area from 0.19 to 0.02 when the power is not applied initially, and the friction coefficient is reduced by an order of magnitude. The running-in period is tens of cycles, and the running-in period is shorter. When the amorphous carbon film 11 with the thickness of 50nm is adopted for friction, the number of friction turns (one friction back and forth) can at least reach 2000 turns when the low friction characteristic is stably maintained, the maintenance time of the low friction characteristic is long, and the friction stability and the high wear resistance are good. By adopting the adjustment of the horizontal current intensity and the adjustment of the power of horizontal electrons, the low friction and abrasion of the amorphous carbon film 11 are further realized, and the method has important significance for the application of the amorphous carbon film 11 in tribology.
In one embodiment, the direction of the current of the electric field is parallel to the direction of the rubbing movement. The current direction of the electric field is parallel to the friction movement direction, that is, the movement direction of electrons is parallel to the friction movement direction, so that more electrons are gathered in a grinding mark area, the electron density in the grinding mark area is high, more graphene nanocrystals are formed, and the graphene nano-crystal has better low friction coefficient and high wear resistance.
In one embodiment, step S10 specifically includes:
s11, preparing an amorphous carbon film 11 on an insulating substrate 12, and cleaning the surface of the amorphous carbon film 11;
s12, preparing a first electrode 13 and a second electrode 14 at two ends of the surface of the amorphous carbon film 11 after the cleaning treatment;
s13, determining an electric field parameter, and electrically connecting the first electrode 13 with the second electrode 14 according to the electric field parameter so as to apply an electric field parallel to the surface of the amorphous carbon film.
Specifically, in order to ensure that current flows only through the amorphous carbon film 11 during application of an electric field to the amorphous carbon film 11, an insulating substrate 12 is employed as a substrate supporting the amorphous carbon film 11, and preferably, the insulating substrate 12 may be, but is not limited to, a silicon oxide substrate. After the carbon film is prepared, the surface of the carbon film is cleaned, so that the surface of the carbon film is ensured to be clean. Then, a first electrode 13 and a second electrode 14 are respectively prepared at both ends of the surface of the amorphous carbon film 11, and the first electrode 13 and the second electrode 14 are each selected from one of, but not limited to, a copper electrode, a silver electrode, an iron electrode, a titanium electrode, and a platinum electrode. The parameters of the electric field to be applied are determined, and the first electrode 13 and the second electrode 14 are electrically connected by using an electric wire and a power source according to the parameters of the electric field.
In one embodiment, the electric power of the amorphous carbon film is adjusted by the electric field parameter, which is a voltage value and/or a current value of the amorphous carbon film.
Since the resistances of the amorphous carbon films 11 of different sizes or thicknesses are different, in order to achieve the optimal friction effect, the current value required for the small resistance is large, and the current value required for the large resistance is small, but when the friction effect is optimal, the electric power of the amorphous carbon films 11 is uniform, the condition that the amorphous carbon film 11 of any size can achieve the optimal friction effect can be determined by determining the electric power of the amorphous carbon film 11, and the electric power of the amorphous carbon film can be adjusted by adjusting the voltage value and/or the current value of the amorphous carbon film, thereby achieving the optimal friction effect. Further, the electric power of the amorphous carbon film 11 is not more than 5.5W, and if the electric power is too large, the heat applied to the amorphous carbon film is too large to damage the carbon film, and preferably the electric power of the amorphous carbon film is 3 to 4.3W, and the friction coefficient can be reduced to 0.02 in this electric power range.
In one embodiment, the friction member 24 is made of a material selected from one of a metallic material and a ceramic material. The present invention is suitable for friction of amorphous carbon film with metal material or ceramic material, and the friction member 24 may be made of metal material, such as copper, iron, carbon steel, etc., or ceramic material, such as alumina ceramic, silicon nitride ceramic, silicon carbide ceramic, etc. The friction member 24 of the present invention may be spherical or polyhedral, that is, the friction contact between the friction member 24 and the amorphous carbon film 11 may be point-to-surface contact or surface-to-surface contact.
In one embodiment, step S20 specifically includes:
s21, cleaning the friction piece 24, and fixing the cleaned friction piece 24 to a friction device;
s22, determining friction motion parameters, and controlling the friction device according to the friction motion parameters to enable the friction piece 24 to perform friction motion on the surface of the amorphous carbon film 11.
Specifically, the friction device adopted by the invention is a reciprocating friction and wear testing machine, and other friction devices can be adopted as long as the effect of the invention can be achieved. Referring to fig. 3, the reciprocating frictional wear testing machine includes: the device comprises a cantilever beam 21, a friction assembly arranged at the lower part of the first end of the cantilever beam 21, and an insulating base 16 arranged at the lower end of the friction assembly and used for fixing the amorphous carbon film 11. The friction assembly comprises a friction piece 24 and a friction piece clamp for fixing the friction piece 24, the friction piece clamp comprises a fixed sleeve 23 with internal threads and an insulating fixed seat, the insulating fixed seat comprises a fixed base 22 and a fixed column (not shown in the figure) with external threads, the fixed column is connected with the fixed base 22, the fixed base 22 is fixedly connected with the cantilever beam 21, the fixed sleeve 23 is sleeved on the fixed column, and the fixed column is matched and screwed up through the matching of the internal threads and the external threads; the surface of the fixed column far away from the fixed base 22 is provided with a groove capable of accommodating the friction piece 24, a through hole for the friction piece 24 to pass through is formed at the opposite position of the bottom of the fixed sleeve 23 and the groove, and the width of the through hole is smaller than the maximum width of the friction piece 24 in the horizontal direction. When the friction member 24 is fixed to the friction device, a part of the friction member 24 is located at the groove, and another part of the friction member 24 passes through the through hole to be located outside the fixing sleeve 23 and protrudes at a certain height with respect to the bottom of the fixing sleeve 23 so as to be in contact with the amorphous carbon film 11. A loading table 25 is provided at an upper portion of the first end of the cantilever beam 21 for adding a weight such as a load 26 (e.g., a weight) to adjust the load of the friction member 24. The parameters of the frictional movement refer to parameters related to the frictional movement, and the parameters of the frictional movement to be determined by the present invention include the sliding speed, the frictional travel, the frictional member load, etc. Further, the friction member has a load of 1 to 5N, the sliding speed of 0 to 120mm/s, and the friction stroke of 0 to 50mm.
The invention is illustrated in more detail by the following examples:
example 1
(1) Preparation of amorphous carbon film 11 with electrodes in horizontal direction
The amorphous carbon film 11 with the electrodes in the horizontal direction is mainly composed of a silicon oxide wafer on which the amorphous carbon film 11 is deposited, an insulating glass plate, conductive silver paste, copper electrodes (copper tape), and copper wires. Firstly, lightly wiping the surface of an amorphous carbon film 11 deposited on a silicon oxide wafer by using acetone, then, coating a layer of conductive silver paste on the surfaces of two sides of the carbon film in the horizontal direction, simultaneously setting a copper wire at the conductive silver paste on the carbon film, placing the amorphous carbon film 11 on a heating table for heating for 30min, and sticking a copper tape on the wire after the copper wire and the conductive silver paste are completely solidified, thus obtaining a first electrode and a second electrode. Next, the amorphous carbon film 11 was fixed on the insulating glass plate 15 with double-sided tape, the insulating glass plate 15 was fixed on the insulating base 16, and the position reference mark paper was stuck on one side of the sample, and finally the surface of the carbon film was lightly wiped with acetone to complete the preparation of the sample of the amorphous carbon film 11 with electrodes in the horizontal direction.
(2) The frictional wear characteristics of the amorphous carbon film 11 were tested.
Firstly, the steel balls meeting the roughness requirement are respectively cleaned by absolute ethyl alcohol, acetone and deionized water for 10 minutes by ultrasonic waves, and are dried by an electric hair drier, then the steel balls are placed into the fixed sleeve 23, the fixed sleeve 23 is fixed on the fixed column of the insulating fixed seat, and the screw threads are screwed to ensure that the fixed sleeve 23 and the fixed column are in close contact with the steel balls, so that the steel balls are fixed. After confirming under an optical microscope that the area to be rubbed is clean, respectively lightly wiping the surface of the steel ball by alcohol and acetone, and finally fixing the insulating fixing seat on a reciprocating friction and wear testing machine.
Next, an insulating base 16 of the amorphous carbon film 11 with electrodes in the horizontal direction is fixed on a displacement table, wires of electrodes at two ends of the amorphous carbon film 11 are connected to the positive electrode and the negative electrode of a direct current power supply, and then the surface of a sample is gently rubbed by an ear cleaning ball, so that dust absorption is avoided.
And a strain gauge 27 (used for acquiring friction data) is arranged on the cantilever beam 21, the strain gauge 27 is connected with a strain amplifier, the cantilever beam 21 is in a horizontal balance state before no load is applied, the friction device is connected with a displacement table, the displacement table in the z direction (vertical direction) is manually adjusted to enable the steel ball to slowly approach and contact the surface of the amorphous carbon film 11, the displacement table in the y direction (direction perpendicular to the current direction) is manually adjusted, the steel ball is moved to an area where a friction experiment is required to be carried out, the friction piece load in a constant normal direction is 2N, the constant sliding speed is set to be 5mm/s, the friction stroke is set to be 20mm, the initial temperature is 20.5 ℃, the humidity is 50%, the friction motion parameter is determined, then a reciprocating friction wear tester, the strain gauge amplifier (connected with the strain gauge), the signal collector (connected with the strain gauge amplifier) is used for collecting friction data), the switch of a direct current power supply is manually cleared, then the control program and data acquisition software of the linear motor on the displacement table are manually cleared, the sampling frequency of the signal collector is set to be 100Hz, and the sampling frequency of the direct current output of the signal collector is set to be 0.02W, and the corresponding power of the direct current output of the carbon film is set to be 0.02.
And finally, clicking a collection button of the data collection software, clicking a direct current power supply output (output) button and a Start button of a control program of the linear motor at the same time, performing a friction test, manually adjusting a z-direction displacement table after the friction motion lasts for 2.5h (1000 circles) to enable the steel ball to leave the surface of the amorphous carbon film 11, stopping the linear motor control program, the direct current output and friction data collection, and storing friction data. The friction test was repeated 5 times, and the average friction coefficient of the carbon film for 5 times was measured to be 0.19.
Example 2
The friction test procedure was the same as in example 1, except that the current intensity of the output of the direct current power supply was set to 0.04A, the electric power of the corresponding amorphous carbon film 11 was 1.3W, and the average friction coefficient of the carbon film 5 times was measured to be 0.17.
Example 3
The friction test procedure was the same as in example 1, except that the current intensity of the dc power supply output was set to 0.06A, the electric power of the corresponding amorphous carbon film 11 was 2.0W, and the average friction coefficient of the carbon film was measured 5 times to be 0.17.
Example 4
The friction test procedure was the same as in example 1, except that the current intensity of the dc power supply output was set to 0.08A, the electric power of the corresponding amorphous carbon film 11 was 3.0W, and the average friction coefficient of the carbon film was measured 5 times to be 0.02.
Example 5
The friction test procedure was the same as in example 1, except that the current intensity of the output of the direct current power supply was set to 0.1A, the electric power of the corresponding amorphous carbon film 11 was 4.3W, and the average friction coefficient of the carbon film was measured 5 times to be 0.02.
Example 6
The friction test procedure was the same as in example 1, except that the current intensity of the output of the direct current power supply was set to 0.12A, the electric power of the corresponding amorphous carbon film 11 was 5.5W, and the average friction coefficient of the carbon film was measured 5 times to be 0.03.
Comparative example 7
The friction test procedure was the same as in example 1, except that the current intensity outputted from the direct current power supply was set to 0A, the electric power of the corresponding amorphous carbon film 11 was 0W, and the average friction coefficient of the carbon film was measured 5 times to be 0.19.
The data of examples 1 to 6 and comparative example 1 were made into line graphs of the change in friction coefficient with electric power as shown in fig. 4, and it can be seen that the friction coefficient of the wear scar region was minimum when the electric power was controlled between 3 and 4.3W.
Example 8
The friction test procedure was the same as in example 1, except that the current intensity of the dc power supply output was set to 0.09A, the electric power of the corresponding amorphous carbon film 11 was 3.6W, the friction movement was continued for 4.5h (2000 cycles), the friction coefficient test result was as shown in fig. 5, after repeating the friction test 5 times, according to the test result of 5 times, it was found that the low friction characteristic of the carbon film of 50nm thickness could be maintained stably for at least 2000 cycles, the average friction coefficient of the friction test repeated 5 times could also be maintained at 0.02 or less, indicating that it had not only the low friction coefficient but also the high wear resistance. The raman spectra of the abrasion mark region before and after abrasion are shown in fig. 6, and fig. 6 shows that graphene nanocrystals are formed in the abrasion mark region after horizontal electron induced abrasion.
In summary, the present invention provides a method for low friction and wear of an amorphous carbon film by horizontal electron induction, comprising: friction ball is adopted to carry out friction movement on the surface of the amorphous carbon film; applying an electric field parallel to a surface of the amorphous carbon film during the rubbing movement to reduce rubbing abrasion of the amorphous carbon film; wherein the direction of the rubbing movement has a component parallel to the direction of the electric field. By applying an electric field parallel to the surface of the amorphous carbon film and performing friction motion on the surface of the amorphous carbon film, a small amount of graphene nanocrystals are formed in a grinding mark area on the surface of the amorphous carbon film, the resistance of the grinding mark area is reduced, and the conductivity is increased, so that electrons are converged to the grinding mark area to form large graphene nanocrystals which are parallel to the friction direction, the friction coefficient of the grinding mark area is reduced by one order of magnitude, and meanwhile, the maintenance time of the low friction characteristic of the graphene nanocrystals is longer, so that the graphene nanocrystals have good wear resistance.
It is to be understood that the invention is not limited in its application to the examples described above, but is capable of modification and variation in light of the above teachings by those skilled in the art, and that all such modifications and variations are intended to be included within the scope of the appended claims.
Claims (8)
1. A method of horizontal electron induced low friction wear of an amorphous carbon film, comprising:
friction movement is carried out on the surface of the amorphous carbon film by adopting a friction piece;
applying an electric field parallel to a surface of the amorphous carbon film during the rubbing movement to reduce rubbing abrasion of the amorphous carbon film;
wherein the direction of the rubbing motion has a component parallel to the direction of the electric field; the application of an electric field parallel to the surface of the amorphous carbon film on the amorphous carbon film specifically includes: preparing an amorphous carbon film on an insulating substrate, and cleaning the surface of the amorphous carbon film;
preparing a first electrode and a second electrode at two ends of the surface of the amorphous carbon film after the cleaning treatment;
determining an electric field parameter, and electrically connecting the first electrode and the second electrode according to the electric field parameter so as to apply an electric field parallel to the surface of the amorphous carbon film;
the electric power of the amorphous carbon film is not more than 5.5W.
2. The method of claim 1, wherein the direction of the current of the electric field is parallel to the direction of the rubbing motion.
3. The method of claim 1, wherein the electric power of the amorphous carbon film is adjusted by the electric field parameter, and the electric field parameter is a voltage value and/or a current value of the amorphous carbon film.
4. The method of claim 1, wherein the insulating substrate is a silicon oxide substrate.
5. The method for horizontal electron induced low friction wear of amorphous carbon film according to claim 1, wherein the material of the friction member is selected from one of a metal material or a ceramic material.
6. The method for horizontally electron-induced low friction wear of an amorphous carbon film according to claim 1, wherein the friction member is used for friction movement on the surface of the amorphous carbon film, specifically comprising:
cleaning the friction piece, and fixing the cleaned friction piece on a friction device; and determining a friction motion parameter, and controlling the friction device according to the friction motion parameter to enable the friction piece to perform friction motion on the surface of the amorphous carbon film.
7. The method of claim 6, wherein the tribo-kinetic parameters are sliding speed, friction stroke and friction member load.
8. The method of low friction wear of a horizontal electron induced amorphous carbon film according to claim 7, wherein the sliding speed is 0 to 120mm/s and the friction stroke is 0 to 50mm at the friction member load is 1 to 5N.
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| CN102128345A (en) * | 2010-12-17 | 2011-07-20 | 清华大学 | Method for reducing friction coefficient through controlling near wall surface liquid crystal arrangement by external electric field |
| CN107655823A (en) * | 2017-10-23 | 2018-02-02 | 深圳大学 | A kind of reciprocating friction generating output performance and coefficient of friction synchronous testing device |
| CN108593541A (en) * | 2018-03-22 | 2018-09-28 | 深圳大学 | A kind of rubbing device and its test method of extra electric field induction |
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| US7537835B2 (en) * | 2001-09-27 | 2009-05-26 | Kabushiki Kaisha Toyota Chuo Kenkyusho | High friction sliding member |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102128345A (en) * | 2010-12-17 | 2011-07-20 | 清华大学 | Method for reducing friction coefficient through controlling near wall surface liquid crystal arrangement by external electric field |
| CN107655823A (en) * | 2017-10-23 | 2018-02-02 | 深圳大学 | A kind of reciprocating friction generating output performance and coefficient of friction synchronous testing device |
| CN108593541A (en) * | 2018-03-22 | 2018-09-28 | 深圳大学 | A kind of rubbing device and its test method of extra electric field induction |
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