A light-controlled friction experimental device and friction coefficient control method

Abstract

The present invention discloses a light-controlled friction experimental device and a friction coefficient control method. During the friction process, the device uses laser light to illuminate the friction contact point through a grinding ball to achieve active control of the friction coefficient, that is, to achieve light-controlled friction. The light-controlled friction experimental device includes: a lower friction unit for supporting and placing a sample to be rubbed and controlling the rotation of the sample to be rubbed as needed, and an upper friction unit for rubbing the sample to be rubbed; the lower friction unit includes: a rotating table driven to rotate by a drive motor, and the sample to be rubbed; the upper friction unit includes: grinding balls, grinding ball caps, fixed rods and cantilever beams. In addition, there is a real-time controllable laser above the upper friction unit. The present invention can reduce the friction coefficient of diamond-like carbon film and quartz by 60%. The present invention provides a device and method for achieving real-time laser control of the friction coefficient, which can achieve active control of the friction behavior by controlling the laser.

Description

Technical Field

[0001] The present invention relates to the technical field of friction devices, in particular to a light-controlled friction experimental device. Background Art

[0002] Active friction control has long been a sought-after technology. Currently, some applications require this capability. Extensive research has been conducted on the friction properties of various solid lubricants under varying electric, thermal, and magnetic fields.

[0003] However, there is still little research on the friction characteristics of solid lubricating materials under light fields, especially the lack of exploration on the influence of laser directly irradiating the friction contact points during the friction process on the friction behavior.

[0004] Therefore, the existing technology still needs to be improved and developed. Summary of the Invention

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a light-controlled friction experimental device and a friction coefficient control method. The present invention has a simple structure and is easy to assemble. The present invention can realize active regulation of the laser on the friction behavior by irradiating the friction contact points through the grinding balls during the friction process.

[0006] The technical solutions of the present invention are as follows:

[0007] A light-controlled friction experimental device, comprising:

[0008] A lower friction unit for supporting and placing a sample to be rubbed and controlling the rotation of the sample to be rubbed as needed, an upper friction unit disposed above the lower friction unit for rubbing the sample to be rubbed, and a real-time adjustable laser disposed on the upper friction unit for controlling the friction coefficient of the sample to be rubbed;

[0009] The upper friction unit is fixedly provided with a transparent friction member for rubbing the sample to be rubbed;

[0010] The lower friction unit includes: a rotating table driven by a driving motor, the rotating table is used to place the sample to be rubbed, and drives the sample to be rubbed to rotate as needed according to the driving motor; the driving motor drives the rotating table to rotate the sample to be rubbed to achieve grinding with the transparent friction part, and the friction coefficient is actively controlled by controlling the laser focal length, power, and irradiation time.

[0011] The light-controlled friction experimental device, wherein the rotating table is provided with a fixing fixture for fixing the sample to be rubbed; the rotating table fixes the sample to be rubbed through the fixing fixture; the sample to be rubbed is a thin film or a block sample.

[0012] The light-controlled friction experimental device, wherein the transparent friction member is a hard transparent grinding ball;

[0013] The upper friction unit includes: hard transparent grinding balls for contacting and rubbing with the sample to be rubbed, a grinding ball cap connected to the grinding ball for fixing the grinding ball, a fixing rod connected to the grinding ball cap for fixing the grinding ball cap, and a cantilever beam fixedly connected to the fixing rod.

[0014] The light-controlled friction experimental device, wherein the upper friction unit further comprises:

[0015] A weight tray is arranged on the cantilever beam corresponding to the upper portion of the fixing rod, and a loading weight is detachably arranged above the weight tray.

[0016] In the light-controlled friction experimental device, the weight tray and the fixing rod are fixed to the cantilever beam by screws.

[0017] A threaded through hole is provided inside the fixing rod, and the fixing rod is fixedly connected to one end of the cantilever beam by a screw;

[0018] The top of the grinding ball cap is provided with an internal thread which is threadedly connected to the lower end of the fixing rod, and the bottom of the grinding ball cap is provided with a groove through hole for fixing and installing the grinding balls.

[0019] The light-controlled friction experimental device further comprises a strain gauge provided at the other end of the cantilever beam for monitoring the friction coefficient.

[0020] The light-controlled friction experimental device is described, wherein the laser is arranged above the loading weight, the loading weight is hollow in the middle, the weight tray is hollow in the middle, the screw is hollow in the middle, and the fixing rod is hollow in the middle; the laser light of the laser sequentially passes through the hollow of the loading weight, the hollow of the weight tray, the hollow of the screw, the hollow of the fixing rod and the transparent grinding ball, and finally passes through the grinding ball to irradiate the surface of the sample to be rubbed, so as to control the friction coefficient between the surface of the sample to be rubbed and the grinding ball.

[0021] A method for controlling the friction coefficient of the light-controlled friction experimental device according to any one of the above items, comprising the steps of:

[0022] Preparing a sample to be rubbed, and placing the prepared sample to be rubbed on a rotating table of a light-controlled friction experimental device, corresponding to the bottom of the transparent friction member;

[0023] Place a hollow weight on the weight tray and use the mass of the weight to apply load to the friction unit below;

[0024] The friction operation is started by controlling the upper friction unit to remain stationary, while the rotating table of the lower friction unit is driven by the driving motor to rotate in a circular motion, and the sample to be rubbed is fixed on the rotating table. The rotating table rotates in a circular motion to drive the sample to be rubbed to rotate and to perform a grinding operation with the transparent friction member;

[0025] The laser is controlled to turn on and the friction coefficient is actively regulated by controlling the laser focal length, power and irradiation time.

[0026] The friction coefficient control method, wherein the step of preparing the sample to be rubbed includes: preparing a sample carbon film as the sample to be rubbed, and the step of preparing the sample carbon film includes:

[0027] Deposit the required sample carbon film using the ECR plasma nanosurface processing system;

[0028] The step of placing the prepared sample to be rubbed on the rotating table of the light-controlled friction experimental device, corresponding to the bottom of the transparent friction member, further includes:

[0029] The sample carbon film is in contact with the grinding ball and the cantilever is kept horizontal.

[0030] The friction coefficient control method, wherein:

[0031] The steps of controlling the laser to turn on and actively regulating the friction coefficient by controlling the laser focal length, power, and irradiation time include:

[0032] Controlling the application of a normal load of 2 to 20 N to the sample to be rubbed, and performing a friction motion on the surface of the sample to be rubbed using the transparent friction member;

[0033] During the friction movement, a laser with a power of 0 to 50 W is applied to the transparent friction member to control the friction coefficient between the transparent friction member and the sample to be rubbed.

[0034] Compared with the prior art, the embodiments of the present invention have the following advantages:

[0035] The present invention provides an experimental device and method for achieving laser-controlled friction. The device has a simple structure and is easy to assemble. By irradiating the friction contact points of the grinding balls with laser light during the friction process, active control of the laser's friction behavior can be achieved. This method is direct and efficient. During the friction between a sample and a transparent grinding ball, the laser light irradiates only the friction contact points on the sample surface through the grinding balls and does not affect other non-friction areas of the sample surface. Compared to a method in which no laser light is applied to the friction contact points between the transparent grinding balls and the sample, the device significantly reduces the coefficient of friction between the transparent friction member and the sample, achieving low friction. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0037] Figure 1 Schematic diagram of the structure of the light-controlled friction experimental device of Example 1 of the present invention.

[0038] Figure 2 Schematic diagram of the structure of the light-controlled friction experimental device of Example 2 of the present invention.

[0039] Figure 3 Schematic diagram of the structure of the light-controlled friction experimental device of Example 3 of the present invention.

[0040] Figure 4 Schematic diagram of the flow of Example 1 of the friction coefficient control method of the light-controlled friction experimental device according to an embodiment of the present invention.

[0041] Figure 5 Schematic diagram of the flow of Example 2 of the friction coefficient control method of the light-controlled friction experimental device according to an embodiment of the present invention.

[0042] Figure 6a and Figure 6b This is a comparison diagram of friction coefficient curves of the friction between a quartz ball and a carbon film with and without laser irradiation when the normal load is 2N according to the friction coefficient control method of the light-controlled friction experimental device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0043] In order to enable those skilled in the art to better understand the solutions of the present invention, the following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0044] Active friction control has long been a sought-after technology. Currently, some applications require this capability. Extensive research has been conducted on the friction properties of various solid lubricants under varying electric, thermal, and magnetic fields.

[0045] The inventors have discovered that lasers, due to their high directivity, monochromaticity, and high energy, produce varying thermal, photochemical, and electromagnetic effects on different materials. These effects, coupled together, can alter the surface structure of materials and influence frictional properties. However, research on the effects of laser-induced surface structural changes on friction remains limited, particularly regarding the effects of lasers directly irradiating the friction contact points during the friction process.

[0046] Therefore, the present invention provides an experimental device and method for achieving laser-controlled friction. This method actively controls the laser's friction behavior by illuminating the friction contact points of the grinding balls during the friction process. This method is direct and efficient. During the friction between the sample and the transparent grinding balls, the laser irradiates only the friction contact points on the sample surface through the grinding balls and does not affect other non-friction areas of the sample surface. Compared to a method in which no laser is applied to the friction contact points between the transparent grinding balls and the sample, the present invention significantly reduces the coefficient of friction between the transparent friction member and the sample, achieving low friction.

[0047] Specifically, if Figure 1 As shown, Figure 1 This is a schematic diagram of the structure of a light-controlled friction experimental device according to Example 1 of the present invention. In one embodiment of the present invention, a light-controlled friction experimental device is disclosed. The light-controlled friction experimental device comprises: a lower friction unit 200 for supporting and controlling the rotation of a sample to be rubbed; an upper friction unit 100 disposed above the lower friction unit for rubbing the sample to be rubbed; and a real-time controllable laser 11 disposed on the upper friction unit for controlling the friction coefficient of the sample to be rubbed. The upper friction unit 100 is fixedly provided with a transparent friction member for rubbing the sample to be rubbed 2. Preferably, in this embodiment, the transparent friction member is a hard, transparent grinding ball 3; the hard, transparent grinding ball 3 can be made of quartz (a non-metallic silicate material) or sapphire (aluminum oxide). The sample to be rubbed 2 is a thin film or a bulk sample.

[0048] The lower friction unit 200 comprises a rotating platform 1 and a sample 2 to be rubbed, which is placed above the rotating platform. The rotating platform 1 rotates the sample 2 as needed; the sample 2 can be a thin film or a block. The rotating platform 1 is driven by a drive motor located below the rotating platform.

[0049] In an embodiment of the present invention, the lower friction unit is provided to include: a rotating table driven by a driving motor, the rotating table is used to place the sample to be rubbed, and drives the sample to be rubbed to rotate as needed according to the driving motor; the rotating table is driven by the driving motor to rotate the sample to be rubbed to achieve grinding with the transparent friction part, and the friction coefficient is actively controlled by controlling the focal length, power and irradiation time of the laser.

[0050] Further, if Figure 1 As shown, the upper friction unit 100 includes: a hard transparent grinding ball 3 for contacting and rubbing with the sample 2 to be rubbed, a grinding ball cap 4 connected to the grinding ball 3 for fixing the grinding ball 3, a fixing rod 5 connected to the grinding ball cap 4 for fixing the grinding ball cap 4, and a cantilever beam 10 fixedly connected to the fixing rod 5.

[0051] A threaded through hole is provided inside the fixing rod 5 , and the fixing rod 5 is fixedly connected to one end of the cantilever beam 10 by a screw.

[0052] The lower end of the fixing rod 5 is provided with an external thread, the top of the grinding ball cap 4 is provided with an internal thread that is threadedly connected to the lower end of the fixing rod 5, and the bottom of the grinding ball cap 4 is provided with a groove through-hole for fixing and mounting the counter-grinding balls 3. The counter-grinding ball cap 4 is screwed to the external thread at the lower end of the fixing rod 5 via the internal thread of the counter-grinding ball cap 4 and the external thread at the lower end of the fixing rod 5, thereby fixing the counter-grinding balls 3 below the fixing rod 5.

[0053] In an embodiment of the present invention, the upper friction unit further comprises: a weight tray disposed on the cantilever beam corresponding to the upper portion of the fixing rod, and a loading weight detachably disposed above the weight tray. Figure 1 As shown, a weight tray 6 and a hollow loading weight 7 are provided on the cantilever beam 10 corresponding to the upper side of the fixing rod 5; a loading weight 7 of a determined mass can be placed on the weight tray 6 as required to provide a normal load to the sample to be rubbed.

[0054] In the embodiment of the present invention, the weight tray 6 and the fixing rod 5 are fixed on the cantilever beam 10 by screws, corresponding to the upper end of the fixing rod 5. The function of the screws is to fix the tray 6 and the fixing rod 5 to the cantilever beam 10.

[0055] Furthermore, the optically controlled friction experimental device of the embodiment of the present invention further comprises: a strain gauge for monitoring the friction coefficient provided at the other end of the cantilever beam. Figure 1As shown, a strain gauge 9 is provided at the other end of the cantilever beam 10. The present invention uses the strain gauge 9 to connect to a signal processing system, and monitors the friction coefficient by converting the force signal of the strain gauge 9 into an electrical signal, which can easily monitor the friction coefficient. A strain gauge is an element composed of a sensitive grid and other components for measuring strain. The working principle of a resistance strain gauge is based on the strain effect, that is, when a conductor or semiconductor material undergoes mechanical deformation under the action of an external force, its resistance value changes accordingly. This phenomenon is called the "strain effect."

[0056] Furthermore, the optically controlled friction experimental device of an embodiment of the present invention is further provided with a real-time adjustable laser 11 for controlling the friction coefficient by irradiating the sample to be rubbed with laser light. Preferably, the laser 11 can be aligned with the sample to be rubbed and activated as needed. For example, the laser 11 can be positioned above the loading weight 7, wherein the loading weight 7 has a hollow center, the weight tray 6 also has a hollow center, the screw also has a hollow center, and the fixing rod 5 also has a hollow center. The laser light from the laser 11 sequentially passes through the hollow center of the loading weight 7, the hollow center of the weight tray 6, the hollow center of the screw, the hollow center of the fixing rod 5, and the transparent grinding ball 3, and finally shines through the grinding ball 3 onto the surface of the sample to be rubbed 2. This is used to control the friction coefficient between the surface of the sample to be rubbed and the grinding ball; irradiation by the laser 11 can reduce friction on the surface of the sample to be rubbed. In specific implementation, the laser 11 of the present invention can be controlled in real time, including changing the laser focal length (mm), power (W), irradiation time (s), light density (J / mm^2), wavelength (nm), etc.

[0057] In this embodiment of the present invention, the fixing rod 5 has a threaded through-hole within it for light transmission and connection with a screw. For hard, transparent grinding balls 3, the through-hole is narrower than their diameter. This dual positional restraint of the grinding ball cap 4 and the through-hole of the fixing rod 4 keeps the grinding balls stationary, ensuring a more secure frictional operation.

[0058] The light-controlled friction experimental device of the embodiment of the present invention is as follows: Figure 1 As shown, during the friction process, the upper friction unit 100 remains stationary, while the rotating table 1 of the lower friction unit 200 is driven by a drive motor 201 to rotate in a circular motion. The sample 2 to be rubbed is fixed on the rotating table 1. The rotating table 1's circular motion drives the sample 2 to rotate and rub against the grinding balls 3. The friction speed between the sample 2 and the grinding balls 3 is controlled by the speed of the drive motor 201.

[0059] In the present invention, the grinding balls 3 are in contact with the surface of the sample 2 to be rubbed, and the contact interface is point-to-surface contact. The contact point is a friction contact point, so as to achieve friction on the surface of the sample 2 to be rubbed.

[0060] The grinding ball cap 4 is connected to the fixing rod through an internal thread, and fixes the grinding ball 3 below the fixing rod 5.

[0061] In this embodiment of the present invention, the laser 11 is placed above the loading weight 7. The laser light sequentially passes through the hollow space of the loading weight 7, the hollow space of the weight tray 6, the hollow space of the screw, the hollow space of the fixing rod 5, and the transparent grinding ball 3, ultimately passing through the grinding ball and irradiating the sample surface. By adjusting the laser in real time, such as by changing the laser focal length (mm), power (W), irradiation time (s), light intensity (J / mm²), wavelength (nm), etc., the friction coefficient of the friction area of ​​the sample to be rubbed can be controlled.

[0062] Furthermore, in this embodiment of the present invention, strain gauges 9 are attached to both sides of cantilever beam 10 to collect lateral friction force signals. The rotational motion of the lower friction unit 200 rubs against the upper friction unit, inducing strain deformation in the cantilever beam. The friction force signals are then analyzed and recorded using a friction signal amplification device connected to the strain gauges.

[0063] As can be seen from the above, the present invention discloses a light-controlled friction experimental device, which can realize active regulation of the friction coefficient by irradiating the friction contact points through the grinding balls during the friction process, that is, realizing light-controlled friction.

[0064] The cantilever beam 10 in the embodiment of the present invention is supported by a balancing device. There are many types of balancing devices, such as Figure 2 FIG. 1 is an example of an embodiment.

[0065] A further preferred embodiment of the present invention is as follows Figure 2 As shown, Figure 2 This is a schematic structural diagram of the light-controlled friction experimental device provided in Example 2 of the present invention. Figure 2 The embodiment shown is Figure 1 The structures of the embodiments shown are basically the same, the difference is that the optical friction experimental device of the embodiment of the present invention installs the cantilever beam 10 on a balance support device 300, such as Figure 2 As shown, a balancing support device is connected to the right end of the cantilever beam 10 to keep the cantilever beam in a horizontal state under different loads.

[0066] In a further embodiment, the light-controlled friction experimental device of embodiment 3 of the present invention is as follows: Figure 3 As shown, a fixing fixture 209 for fixing the sample 2 to be rubbed can also be provided on the rotating table 1; the rotating table 1 fixes the sample 2 to be rubbed via the fixing fixture 209. In this way, the sample 2 to be rubbed can be conveniently fixed on the rotating table 1 for rubbing operation.

[0067] Based on the above embodiments of the light-controlled friction experimental device, the present invention also provides a method for controlling the friction coefficient of the light-controlled friction experimental device as described in any one of the above embodiments. Figure 4 As shown, the friction coefficient control method of the light-controlled friction experimental device provided in Example 1 of the present invention includes the following steps:

[0068] Step S10: preparing a sample to be rubbed, and placing the prepared sample to be rubbed on a rotating table of the light-controlled friction experimental device, corresponding to the bottom of the transparent friction member;

[0069] In an embodiment of the present invention, the step of preparing the sample to be rubbed includes: preparing a sample carbon film as the sample to be rubbed, and the step of preparing the sample carbon film includes: depositing the required sample carbon film using an ECR plasma nano-surface processing system.

[0070] The embodiment of the present invention, as Figure 1 and Figure 2 As shown, the sample carbon film is brought into contact with the grinding ball and the cantilever is kept horizontal.

[0071] Step S20: placing a hollow weight on the weight tray, and applying a load to the friction unit below using the mass of the weight;

[0072] Step S30: Control and start the friction operation. The upper friction unit remains stationary, and the rotating table of the lower friction unit is driven by the driving motor to rotate in a circular motion. The sample to be rubbed is fixed on the rotating table. The rotating table rotates in a circular motion to rotate the sample to be rubbed and to perform a grinding operation against the transparent friction member.

[0073] In the embodiment of the present invention, Figure 2 As shown, the rotating table 1 is driven by a driving motor, and the sample 2 to be rubbed is fixed on the rotating table 1. The rotating table 1 rotates in a circle to drive the sample 2 to be rubbed, such as a thin film sample, to rotate and rub against the grinding ball 3.

[0074] Step S40: Control the laser to turn on, and actively adjust the friction coefficient by controlling the laser focal length, power, and irradiation time.

[0075] In the present invention, the steps of controlling the laser to turn on and actively regulating the friction coefficient by controlling the laser focal length, power, and irradiation time include:

[0076] Controlling the loading of the loading weight 7 onto the weight tray 6 to apply a normal load of 2 to 20 N to the sample to be rubbed, and performing a friction motion on the surface of the sample to be rubbed using the transparent friction member;

[0077] During the friction movement, a laser with a power of 0 to 50 W is applied to the transparent friction member to control the friction coefficient between the transparent friction member and the sample to be rubbed.

[0078] The following is a detailed description of the method of the present invention through a specific application example: Figure 4 As shown, a specific application embodiment of the present invention provides a method for controlling the friction coefficient of the above-mentioned light-controlled friction experimental device, including the following steps:

[0079] S100, preparation of carbon film;

[0080] In this embodiment of the present invention, the friction sample 2 is a carbon film. This step prepares the sample carbon film. The carbon film sample is deposited using an ECR plasma nanosurface processing system. The experimental apparatus is assembled, ensuring that the carbon film sample is in contact with the grinding ball and the cantilever beam is horizontal.

[0081] S200, applying a normal load of 2 to 20 N to the carbon film, and performing friction motion on the surface of the carbon film using the transparent friction member;

[0082] Specifically, a hollow weight is placed on the weight tray, using its mass to apply load to the friction unit below. The motor is then activated, and the rotating table rotates the carbon film sample to achieve grinding against the grinding balls. During the friction process, a laser is placed above the weight, shining through the transparent grinding balls onto the friction contact points on the carbon film surface. The laser power is 0-50W.

[0083] For example, the laser can be turned on and the friction coefficient can be actively controlled by controlling the laser focal length, power, and irradiation time.

[0084] In this specific application embodiment, during the friction movement, a laser with a power of 0 to 50 W is applied to the transparent friction member, which effectively reduces the friction coefficient between the transparent friction member and the carbon film.

[0085] In one embodiment, the preparation of the carbon film of the sample 2 to be rubbed in step S100 specifically includes:

[0086] S101: Prepare a silicon wafer substrate with a length and width of 25×25 mm, clean it, and fix it on the substrate holder of the electron cyclotron resonance (ECR) plasma nano-surface processing system. Then, evacuate the load chamber and open the gate valve to transfer the substrate holder into the main vacuum chamber.

[0087] Among them, the ECR plasma nano-surface processing system is a thin film manufacturing equipment that can provide the required carbon film.

[0088] S102, wait until the gas in the main vacuum chamber is reduced to 8×10-5 Pa, turn on the circulating cooling water and then introduce argon gas with a flow rate of 13sccm to make the working gas pressure about 0.1Pa, set the currents of magnetic coils 1, 2, and 3 to 40, 40, and 48A respectively, and the microwave power to 500W. After the plasma is stable, set the substrate bias to -50V, use the argon ions in the plasma to clean the substrate for about 3 minutes, close the substrate baffle and open the carbon target, set the carbon target voltage to -500V, use plasma to clean the carbon target for about 3 minutes, open the substrate baffle and start depositing the carbon film.

[0089] Furthermore, the step S200 specifically includes:

[0090] S201, installing the optically controlled friction experimental device according to an embodiment of the present invention, making the carbon film sample contact the grinding ball 3 and ensuring that the cantilever beam is in a horizontal state;

[0091] S202, placing a hollow weight on the weight tray, and applying a load to the friction unit below using the mass of the weight;

[0092] S203, the driving motor is started, and the rotating table drives the carbon film sample to rotate to achieve grinding with the grinding balls;

[0093] In one embodiment, step S300 specifically includes:

[0094] S301, place the laser 11 above the weight and align it with the screw hole for fixing the weight plate and the fixing rod 5. Turn on the laser 11, and the laser passes through the transparent grinding ball 3 to irradiate the surface of the carbon film sample (sample to be rubbed 2).

[0095] The present invention is described in detail below by taking specific data as an example: for example, the friction parameters are determined as follows: the normal load of the transparent quartz friction part is 2N, the friction radius is 1.4μm, the sliding speed is 180 rpm, the laser wavelength is 450nm, and the laser power is 10W.

[0096] After installing the optically controlled friction experimental device according to an embodiment of the present invention, the prepared sample 2 to be rubbed, such as a diamond-like carbon film (DLC) sample, is fixedly placed on the rotating table 1. Clean the transparent quartz grinding ball (i.e., grinding ball 3) and place it under the fixed rod 5, and clamp it with the grinding ball cap 4. Connect the fixed rod 5, cantilever beam 9, and weight plate 6 with screws. Place a loading weight 7 with a mass of 200g on the weight plate 6 to make the grinding ball 3 contact with the carbon film sample (sample to be rubbed). Further, turn on the drive motor to start rotating the rotating table 1, turn on the laser 11, and start rubbing the carbon film sample (sample to be rubbed) and the grinding ball 3 under laser irradiation.

[0097] The friction test results of the present invention are as follows Figure 6a and Figure 6b As shown, Figure 6a and Figure 6b The friction coefficient curve comparison chart ( Figure 6b For 10W laser irradiation), in the absence of laser irradiation, the friction coefficient of the diamond-like carbon film and the quartz grinding ball is about 0.15. Under laser irradiation, the friction coefficient of the diamond-like carbon film and the quartz grinding ball is about 0.06. This shows that the friction coefficient between the diamond-like carbon film and quartz can be reduced by laser control in an atmospheric environment. Therefore, the method of the embodiment of the present invention can be used to control and reduce the friction coefficient of the diamond-like carbon film. The present invention provides a method for realizing real-time laser control of the friction coefficient, which can realize active regulation of the friction behavior of the laser. The method of the present invention can reduce the friction coefficient of the diamond-like carbon film and quartz by 60%.

[0098] Compared with the prior art, the embodiments of the present invention have the following advantages:

[0099] The present invention provides an experimental device and method for achieving laser-controlled friction. The device has a simple structure and is easy to assemble. By irradiating the friction contact points of the grinding balls with laser light during the friction process, active control of the laser's friction behavior can be achieved. This method is direct and efficient. During the friction between a sample and a transparent grinding ball, the laser light irradiates only the friction contact points on the sample surface through the grinding balls and does not affect other non-friction areas of the sample surface. Compared to a method in which no laser light is applied to the friction contact points between the transparent grinding balls and the sample, the device significantly reduces the coefficient of friction between the transparent friction member and the sample, achieving low friction.

[0100] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0101] It should be understood that the present invention is not limited to the exact construction described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

[0102] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A light-controlled friction experimental device, characterized in that: include: A lower friction unit for supporting and placing a sample to be rubbed and controlling the rotation of the sample to be rubbed as needed, an upper friction unit disposed above the lower friction unit for rubbing the sample to be rubbed, and a real-time adjustable laser disposed on the upper friction unit for controlling the friction coefficient of the sample to be rubbed; The upper friction unit is fixedly provided with a transparent friction member for rubbing the sample to be rubbed; The lower friction unit includes: a rotating table driven by a driving motor, the rotating table is used to place the sample to be rubbed, and the driving motor drives the sample to be rubbed to rotate as needed; the driving motor drives the rotating table to rotate the sample to be rubbed to achieve grinding against the transparent friction member, and the friction coefficient is actively regulated by controlling the laser focal length, power, and irradiation time; The laser is arranged above the loading weight, the loading weight is hollow in the middle, the weight tray is hollow in the middle, the screw is hollow in the middle, and the fixing rod is hollow in the middle; the laser light of the laser sequentially passes through the hollow of the loading weight, the hollow of the weight tray, the hollow of the screw, the hollow of the fixing rod, and the transparent grinding ball, and finally shines through the grinding ball to the surface of the sample to be rubbed, so as to control the friction coefficient between the surface of the sample to be rubbed and the grinding ball; Laser irradiation can reduce friction on the surface of the sample to be rubbed. The laser can be controlled in real time, including changing the laser focal length, power, irradiation time, light density, and wavelength. The steps of controlling the laser to turn on and actively adjust the friction coefficient by controlling the laser focal length, power, and irradiation time include: Controlling the application of a normal load of 2 to 20 N to the sample to be rubbed, and performing a friction motion on the surface of the sample to be rubbed using the transparent friction member; During the friction movement, a laser with a power of 0 to 50 W is applied to the transparent friction member to control the friction coefficient between the transparent friction member and the sample to be rubbed; A strain gauge for monitoring the friction coefficient is provided at the other end of the cantilever beam; The strain gauge is connected to the signal processing system, and the friction coefficient is monitored by converting the force signal of the strain gauge into an electrical signal. It is very convenient to monitor the friction coefficient. The strain gauge is a component used to measure strain, including a sensitive grid component; The transparent friction member is a hard transparent grinding ball; The upper friction unit includes: hard transparent grinding balls for contacting and rubbing with the sample to be rubbed, a grinding ball cap connected to the grinding ball for fixing the grinding ball, a fixing rod connected to the grinding ball cap for fixing the grinding ball cap, and a cantilever beam fixedly connected to the fixing rod.

2. The light-controlled friction experimental device according to claim 1, characterized in that: The rotating table is provided with a fixing fixture for fixing the sample to be rubbed; the rotating table fixes the sample to be rubbed through the fixing fixture; the sample to be rubbed is a film or a block sample.

3. The light-controlled friction experimental device according to claim 1, characterized in that: The upper friction unit further comprises: A weight tray is arranged on the cantilever beam corresponding to the upper portion of the fixing rod, and a loading weight is detachably arranged above the weight tray.

4. The light-controlled friction experimental device according to claim 3, characterized in that: The weight tray and the fixing rod are fixed to the cantilever beam by screws; A threaded through hole is provided inside the fixing rod, and the fixing rod is fixedly connected to one end of the cantilever beam by a screw; The top of the grinding ball cap is provided with an internal thread which is threadedly connected to the lower end of the fixing rod, and the bottom of the grinding ball cap is provided with a groove through hole for fixing and installing the grinding balls.

5. A friction coefficient control method based on the light-controlled friction experimental device according to any one of claims 1 to 4, characterized in that: Including steps: Preparing a sample to be rubbed, and placing the prepared sample to be rubbed on a rotating table of a light-controlled friction experimental device, corresponding to the bottom of the transparent friction member; Place a hollow weight on the weight tray and use the mass of the weight to apply load to the friction unit below; The friction operation is started by controlling the upper friction unit to remain stationary, while the rotating table of the lower friction unit is driven by the driving motor to rotate in a circular motion, and the sample to be rubbed is fixed on the rotating table. The rotating table rotates in a circular motion to drive the sample to be rubbed to rotate and to perform a grinding operation with the transparent friction member; Control the laser to turn on and actively adjust the friction coefficient by controlling the laser focal length, power and irradiation time; The steps of controlling the laser to turn on and actively regulating the friction coefficient by controlling the laser focal length, power, and irradiation time include: Controlling the application of a normal load of 2 to 20 N to the sample to be rubbed, and performing a friction motion on the surface of the sample to be rubbed using the transparent friction member; During the friction movement, a laser with a power of 0 to 50 W is applied to the transparent friction member to control the friction coefficient between the transparent friction member and the sample to be rubbed; A strain gauge for monitoring the friction coefficient is provided at the other end of the cantilever beam; The strain gauge is connected to the signal processing system, and the friction coefficient is monitored by converting the force signal of the strain gauge into an electrical signal. It is very convenient to monitor the friction coefficient. The strain gauge is a component used to measure strain, including a sensitive grid component; The transparent friction member is a hard transparent grinding ball; The upper friction unit includes: hard transparent grinding balls for contacting and rubbing with the sample to be rubbed, a grinding ball cap connected to the grinding ball for fixing the grinding ball, a fixing rod connected to the grinding ball cap for fixing the grinding ball cap, and a cantilever beam fixedly connected to the fixing rod.

6. The friction coefficient control method according to claim 5, characterized in that: The step of preparing the sample to be rubbed includes: preparing a sample carbon film as the sample to be rubbed, and the step of preparing the sample carbon film includes: Deposit the required sample carbon film using the ECR plasma nanosurface processing system; The step of placing the prepared sample to be rubbed on the rotating table of the light-controlled friction experimental device, corresponding to the bottom of the transparent friction member, further includes: The sample carbon film is in contact with the grinding ball and the cantilever is kept horizontal.

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