Method of regulating water-lubricated friction coefficient

Abstract

The application relates to a method for regulating the friction coefficient of water lubrication, which is used for regulating the friction coefficient between a second contact member and a first contact member made of photosensitive material, and comprises the following steps: contacting the first contact member and the second contact member; running-in the second contact member and the first contact member in a sulfuric acid solution with a preset pH value; after flushing the friction surface of the first contact member for contacting the second contact member, irradiating the friction surface with ultraviolet light; and adding deionized water at the friction surface. The method for regulating the friction coefficient of water lubrication makes the second contact member and the first contact member run-in in the sulfuric acid solution with the preset pH value, flushes the friction surface of the first contact member for contacting the second contact member after the running-in, and irradiates the friction surface with ultraviolet light before adding the deionized water at the friction surface. Since the first contact member is made of the photosensitive material, the surface wetting characteristics of the first contact member are adjusted by irradiating the friction surface with the ultraviolet light.

Description

Technical Field

[0001] This application relates to the field of friction and lubrication technology, and in particular to a method for controlling the coefficient of friction of water lubrication. Background Technology

[0002] The force that hinders the relative motion between the contact surfaces of two objects is called friction. Friction often causes wear and tear on objects. To reduce energy consumption and equipment damage caused by friction and wear, adding an appropriate lubricant to lower the coefficient of friction is crucial. Deionized water (pure water), as the purest and most uncontaminated lubricating medium, has very low viscosity and low internal shear force. Adding deionized water can reduce friction. However, the coefficient of friction cannot be significantly changed when deionized water is added for lubrication. Summary of the Invention

[0003] Therefore, it is necessary to provide a method for controlling the friction coefficient of water lubrication under pure water lubrication.

[0004] A method for controlling the coefficient of friction of water lubrication, used to control the coefficient of friction between a second contact and a first contact made of a photosensitive material, the method comprising:

[0005] Make the first contact and the second contact contact;

[0006] The second contact and the first contact are run-in in a sulfuric acid solution with a preset pH value.

[0007] After rinsing the friction surface on the first contact member that is in contact with the second contact member, the friction surface is irradiated with ultraviolet light;

[0008] Add deionized water to the friction surface.

[0009] In one embodiment, after light exposure, the coefficient of friction between the first contact and the second contact is increased by increasing the volume of the added deionized water;

[0010] After exposure to light, the coefficient of friction between the first contact and the second contact is reduced by decreasing the volume of the added deionized water.

[0011] In one embodiment, the method for increasing the coefficient of friction between the first contact and the second contact includes adding deionized water in the range of 25-75 μL after light irradiation.

[0012] A method for reducing the coefficient of friction between the first contact and the second contact and placing it within the range of 0-0.01 includes adding a volume of deionized water less than or equal to 1 μL after light irradiation.

[0013] In one embodiment, running-in the second contact and the first contact in a sulfuric acid solution with a preset pH value includes:

[0014] Rotate the first contact relative to the second contact;

[0015] During rotation, the load is 1N-8N and the speed is 30-180mm / s.

[0016] In one embodiment, the run-in time is 10-15 minutes.

[0017] In one embodiment, the preset pH value for the running-in is in the range of 1-3.

[0018] In one embodiment, after adding 25-75 μL of deionized water, the speed of the first contact element is in the range of 0.1-0.3 m / s, and the load is greater than 20 MPa.

[0019] In one embodiment, after the volume of added deionized water is less than or equal to 1 μL, the speed of the first contact is greater than 0.08 m / s, and the load range is 14-28 MPa.

[0020] In one embodiment, the conditions for ultraviolet light irradiation include:

[0021] Irradiation intensity is 60-110 mW / cm 2 The irradiation time is greater than 60 minutes, and the irradiation time is shorter as the irradiation intensity increases.

[0022] In one embodiment, the wavelength of the ultraviolet light is 200-400 nm.

[0023] The above-mentioned method for controlling the water-lubricated friction coefficient involves first bringing the second contact element into contact with the first contact element, then running the second contact element and the first contact element in a sulfuric acid solution with a preset pH value. After running-in, the friction surface on the first contact element that is in contact with the second contact element is rinsed. Before adding deionized water to the friction surface, the friction surface is irradiated with ultraviolet light. Because the first contact element is made of photosensitive material, the surface wetting characteristics of the friction surface are adjusted by irradiating the friction surface with ultraviolet light, thereby achieving the control of the water-lubricated friction coefficient of the first contact element surface. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the device for adjusting the coefficient of friction of water lubrication provided in this application.

[0025] Figure 2 The flowchart for adjusting the coefficient of friction of water lubrication provided in this application.

[0026] Figure 3 The graph provided in this application shows the trend of friction coefficient relative to time as the friction coefficient increases.

[0027] Figure 4 The graph showing the trend of relative velocity of friction coefficient as the friction coefficient increases is provided in this application.

[0028] Figure 5 The graph provided in this application shows the trend of friction coefficient relative to load when the friction coefficient is increased.

[0029] Figure 6 The graph showing the trend of friction coefficient relative to time when the friction coefficient is reduced is provided in this application.

[0030] Figure 7 for Figure 6 A magnified view of a portion of the image.

[0031] Figure 8 The graph showing the trend of relative velocity of friction coefficient as the friction coefficient decreases, provided in this application.

[0032] Figure 9 The graph provided in this application shows the trend of friction coefficient relative to load when the friction coefficient is reduced.

[0033] In the picture:

[0034] 100. First contact element;

[0035] 200. Second contact element;

[0036] 300. Deionized water;

[0037] 400. Rotary table;

[0038] 500. Lighting components;

[0039] 600. Mechanical sensors. Detailed Implementation

[0040] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0041] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0042] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0043] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0044] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0045] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0046] This application provides a method for controlling the coefficient of friction of water lubrication, used to control the coefficient of friction between a second contact 200 and a first contact 100 made of a photosensitive material, such as... Figure 1 and Figure 2 As shown, methods for adjusting the coefficient of friction in water lubrication include:

[0047] Make the first contact element 100 and the second contact element 200 come into contact;

[0048] The second contact 200 and the first contact 100 are run-in in a sulfuric acid solution with a preset pH value.

[0049] After rinsing the friction surface on the first contact member 100 that is in contact with the second contact member 200, the friction surface is irradiated with ultraviolet light.

[0050] Add 300 ml of deionized water to the friction surface.

[0051] The above-described method for controlling the water-lubricated friction coefficient involves first bringing the second contact 200 and the first contact 100 into contact, then running the second contact 200 and the first contact 100 in a sulfuric acid solution with a preset pH value. After running-in, the friction surface on the first contact 100 that is in contact with the second contact 200 is rinsed. Before adding deionized water 300 to the friction surface, the friction surface is irradiated with ultraviolet light. Because the first contact 100 is made of photosensitive material, the surface wetting characteristics of the friction surface are adjusted by irradiating it with ultraviolet light, thereby achieving the control of the water-lubricated friction coefficient of the surface of the first contact 100.

[0052] Specifically, such as Figure 1 and Figure 2As shown, during adjustment, the first contact 100 is connected to the rotary table 400, and the second contact 200 can contact the first contact 100. A light-emitting component 500 is positioned above the contact surface, emitting ultraviolet light that illuminates the friction surface of the first contact 100 that contacts the second contact 200. When adjusting the friction coefficient, a sulfuric acid solution with a preset pH value is first added to the friction surface of the second contact 200 and the first contact 100. The rotary table 400 rotates the first contact 100, allowing them to run-in. After running-in, the friction surface is rinsed, and then the friction surface is illuminated using the light-emitting component 500. Finally, deionized water 300 is added to the friction surface. By illuminating the friction surface with the light-emitting component 500, the wetting characteristics of the friction surface are adjusted, thereby adjusting the water-lubricated friction coefficient.

[0053] Specifically, such as Figure 1 As shown, a mechanical sensor 600 is provided to detect the tangential frictional force of the second contact 200 and the longitudinal applied load.

[0054] Specifically, the second contact 200 is made of silicon nitride, and the first contact 100 is made of titanium dioxide. The second contact 200 is made of silicon nitride, such as ceramic, while titanium dioxide is a type of photosensitive material. The first contact 100 is made of titanium dioxide. The second contact 200 and the first contact 100 can move relative to each other, generating friction. Therefore, the coefficient of friction between the first contact 100 and the second contact 200 can be adjusted by ultraviolet light irradiation.

[0055] More specifically, such as Figure 1 As shown, the second contact 200 is a silicon nitride sphere, and the first contact 100 is a titanium dioxide disk. It is understood that in other embodiments, the shapes of the second contact 200 and the first contact 100 can be arbitrary, as long as the second contact 200 is made of silicon nitride and the first contact 100 is made of titanium dioxide.

[0056] Furthermore, the conditions for running-in the second contact 200 and the first contact 100 in a sulfuric acid solution with a preset pH value include:

[0057] Rotate the first contact relative to the second contact;

[0058] During rotation, the load is 1N-8N and the speed is 30-180mm / s.

[0059] By limiting the running-in conditions and satisfying the control conditions, the friction coefficient between the first contact 100 and the second contact 200 can be increased or decreased by an order of magnitude in the final control.

[0060] It should be noted that the load refers to the force exerted by the second contact member 200 on the first contact member 100. The speed refers to the rotational speed of the first contact member 100 relative to the second contact member 200. If the first contact member 100 is fixedly connected to the rotary table 400, it can also be understood as the speed of the rotary table 400.

[0061] Specifically, the running-in time is 10-15 minutes. A sulfuric acid solution with a preset pH value is used for running-in, and the running-in time is controlled within 10-15 minutes. If the running-in time is too short, the required control requirements will not be met. If the running-in time is too long, it may damage the second contact 200 or the first contact 100, affecting the accuracy of control.

[0062] Specifically, the preset pH range for the running-in is 1-3. By limiting the pH of the sulfuric acid solution during the running-in, the running-in process can be controlled to meet the required parameters.

[0063] More specifically, the pH value is 1, meaning that a sulfuric acid solution with a pH value of 1 is used during the running-in process.

[0064] Furthermore, the conditions for ultraviolet light irradiation include: ultraviolet light wavelength of 200-400 nm and intensity of 60 mW / cm². 2 The irradiation time is 60-120 minutes. By limiting the wavelength, intensity, and irradiation time of ultraviolet light, the coefficient of friction of water lubrication can be controlled.

[0065] Furthermore, after light irradiation, the coefficient of friction between the first contact 100 and the second contact 200 can be controlled by adjusting the volume of the added deionized water 300. After light irradiation, increasing the volume of added deionized water 300 increases the coefficient of friction between the first contact 100 and the second contact 200; conversely, decreasing the volume of added deionized water 300 decreases the coefficient of friction. Therefore, the coefficient of friction between the first contact 100 and the second contact 200 can be controlled by increasing or decreasing the volume of added deionized water 300 after light irradiation.

[0066] Specifically, after light exposure, the method for increasing the coefficient of friction between the first contact 100 and the second contact 200 includes adding deionized water in the range of 25-75 μL; after light exposure, the method for decreasing the coefficient of friction between the first contact 100 and the second contact 200 to a range of 0-0.01 includes adding deionized water in a volume less than or equal to 1 μL. When the volume of deionized water 300 added to the friction surface is in the range of 25-75 μL, the coefficient of friction between the first contact 100 and the second contact 200 can increase by an order of magnitude; when the volume of deionized water 300 added to the friction surface is less than or equal to 1 μL, the coefficient of friction between the second contact 200 and the first contact 100 can decrease, and super-lubricity can be achieved between the second contact 200 and the first contact 100, wherein the super-lubricity coefficient of friction range is 0-0.01.

[0067] Experiments revealed that after light exposure, when the volume of deionized water 300 added to the friction surface is within the range of 25-75 μL, the friction coefficient between the first contact 100 and the second contact 200 can increase from 0.05 to 0.7; when the volume of deionized water 300 added to the friction surface is less than or equal to 1 μL, the friction coefficient between the first contact 100 and the second contact 200 can decrease from 0.02 to 0.005. That is, as long as the volume of deionized water 300 added to the friction surface is within the range of 25-75 μL, the friction coefficient between the first contact 100 and the second contact 200 can increase from 0.05 to 0.7. When the volume of deionized water 300 added is greater than 75 μL, the friction coefficient between the first contact 100 and the second contact 200 will decrease back to the level after running-in, approximately 0.05-0.07. The method for controlling the friction coefficient of water lubrication provided in this application can significantly change the friction coefficient under the premise of water lubrication. In actual production, water lubrication can not only reduce costs but also reduce pollution. This application adjusts the surface wetting characteristics of the friction surface by irradiating it with light, and by controlling the volume of the added deionized water 300, the water lubrication friction coefficient of the first contact 100 surface can be increased or decreased by an order of magnitude.

[0068] Furthermore, after adding deionized water to the friction surface, the first contact 100 and the second contact 200 are further rotated relative to each other. By limiting the speed and load of the first contact 100 after adding deionized water, the effect of regulating the coefficient of friction is achieved.

[0069] Specifically, when the volume of added deionized water 300 is 25-75 μL (i.e., sufficient water lubrication), the speed range of the first contact 100 is 0.1-0.3 m / s, and the load is greater than 20 MPa; when the volume of added deionized water 300 is less than or equal to 1 μL (i.e., micro-water lubrication), the speed of the first contact 100 is greater than 0.08 m / s, and the load range is 14-28 MPa.

[0070] Specifically, when it is necessary to increase the friction coefficient between the first contact 100 and the second contact 200, the speed of the first contact 100 should be within the range of 0.1-0.3 m / s, and the load should be greater than 20 MPa; when it is necessary to decrease the friction coefficient between the first contact 100 and the second contact 200, the speed of the first contact 100 should be 0.08 m / s, and the load should be within the range of 14-28 MPa. By limiting the rotational speed and load of the first contact 100 after adding deionized water 300, the friction coefficient can be controlled.

[0071] In summary, the method for adjusting the coefficient of friction of water lubrication provided in this application is as follows:

[0072] The second contact 200 and the first contact 100 are brought into contact, wherein the second contact 200 is made of silicon nitride material and the first contact 100 is made of titanium dioxide material;

[0073] A sulfuric acid solution with a pH of 1 is selected and dripped onto the friction surfaces of the second contact 200 and the first contact 100. The second contact 200 and the first contact 100 are then run-in for a preset time, wherein the preset run-in time is 10-15 minutes, the load during the run-in is 1N-8N, and the speed is 30-180mm / s.

[0074] After rinsing the friction surfaces between the second contact 200 and the first contact 100, the friction surfaces are irradiated with ultraviolet light, wherein the wavelength of the ultraviolet light is 200-400nm and the intensity is 60-110mW / cm². 2 The irradiation time is greater than 60 minutes;

[0075] After irradiation, deionized water 300 is added to the friction surface. By adjusting the volume of the added deionized water 300, the friction coefficient between the first contact 100 and the second contact 200 can be further changed. Increasing the volume of added deionized water 300 increases the friction coefficient between the first contact 100 and the second contact 200; decreasing the volume of added deionized water 300 decreases the friction coefficient between the first contact 100 and the second contact 200. Specifically, when the volume of added deionized water 300 is in the range of 25-75 μL, the friction coefficient can be increased by an order of magnitude. When the volume of added deionized water 300 is less than or equal to 1 μL, the friction coefficient can be decreased by an order of magnitude.

[0076] In summary, this application describes the various conditions for using the method of adjusting the coefficient of friction of water lubrication, wherein,

[0077] Second contact 200 material: silicon nitride;

[0078] Material of the first contact element 100: photosensitive material, such as titanium dioxide;

[0079] Ultraviolet light irradiation conditions: 200-400nm, 60-120min, 60mW / cm² 2 ;

[0080] Lubricant: 300 ml deionized water

[0081] Running-in conditions: load 1-8N, sulfuric acid solution pH=1, 30-180mm / s;

[0082] Increase the coefficient of friction: Deionized water 300 volume: 25-75μL, the speed range of the first contact element 100 is: 0.1-0.3m / s, and the load range of the first contact element 100 is: >20MPa;

[0083] Reduce friction coefficient: Deionized water 300 volume: less than or equal to 1 μL, the speed range of the first contact 100 is: >0.08 m / s, and the load range of the first contact 100 is: 14-28 MPa.

[0084] It should be noted that after adding deionized water, it is necessary to further rotate the first contact 100 and the second contact 200.

[0085] Based on the above method for adjusting the coefficient of friction of water lubrication, this application provides Embodiment 1 and Embodiment 2. In Embodiment 1:

[0086] Using 50 μL of pure water for lubrication, and after irradiating the friction surfaces with ultraviolet light, the coefficient of friction between the first contact 100 and the second contact 200 increased from 0.05 to 0.7, achieving a dramatic increase in the coefficient of friction. The experimental conditions were: irradiation time of 120 min, and a running-in time of 900 s using a sulfuric acid solution with pH=1.

[0087] In Example 2:

[0088] Using 1 μL of pure water for lubrication, after irradiating the friction surfaces with ultraviolet light, the coefficient of friction between the first contact 100 and the second contact 200 decreased from 0.019 to 0.0051, achieving superlubricity. The experimental conditions were: irradiation time of 120 min, and a running-in time of 600 s using a sulfuric acid solution with pH=1.

[0089] By implementing the detection, this application also concludes that Figures 3 to 5 The trend chart shows that when it is necessary to increase the friction coefficient, the volume of deionized water 300 added is 25-75μL, and after adding deionized water 300, the speed range of the first contact 100 is 0.1-0.3m / s, and the load is greater than 20MPa.

[0090] It should be noted that the first contact 100 and the second contact 200 remain relatively stationary when exposed to light and water.

[0091] in, Figure 3 The graph showing the change in friction coefficient relative to time as the friction coefficient increases is provided in this application, where the speed is 56.5 mm / s and the load is 3 N. (The last sentence appears to be incomplete and possibly refers to a different application.) Figure 3 It can be concluded that during the running-in process, the coefficient of friction between the first contact 100 and the second contact 200 gradually decreases from 0.3 as the running-in time increases. When the friction surface is not irradiated with ultraviolet light and plasma water is added directly (i.e., the control group), the coefficient of friction between the first contact 100 and the second contact 200 eventually fluctuates around 0.05. When the friction surface is irradiated with ultraviolet light and then plasma water is added (i.e., the light-irradiated group), and the volume of deionized water 300 added is in the range of 25-75 μL, the coefficient of friction between the first contact 100 and the second contact 200 increases, eventually fluctuating around 0.7.

[0092] Figure 4 This application provides a graph showing the trend of relative velocity variation of the friction coefficient as the friction coefficient increases, where the load is 3N and the velocity is less than or equal to 300mm / s. Figure 4It can be concluded that when the speed is less than 300 mm / s and the friction surface is not irradiated with ultraviolet light, but plasma water is added directly (i.e., the control group), the friction coefficient between the first contact 100 and the second contact 200 gradually decreases with the increase of speed, and the maximum friction coefficient of the first contact 100 is 0.05; when the speed is less than 300 mm / s and the friction surface is irradiated with ultraviolet light and then plasma water is added (i.e., the light-irradiated group), the friction coefficient between the first contact 100 and the second contact 200 increases, fluctuating around 0.7.

[0093] Figure 5 This application provides a graph showing the trend of friction coefficient relative to load as the friction coefficient increases. The graph shows a speed of 56.5 mm / s. Figure 5 It can be concluded that when the load is ≥3N (corresponding to a pressure of about 21MPa), and the friction surface is not irradiated with ultraviolet light, but plasma water is added directly (i.e., the control group), the friction coefficient between the first contact 100 and the second contact 200 does not change significantly; however, when the load is ≥3N (corresponding to a pressure of about 21MPa), and the friction surface is irradiated with ultraviolet light and then plasma water is added (i.e., the light-irradiated group), the friction coefficient between the first contact 100 and the second contact 200 increases, eventually fluctuating at around 0.7.

[0094] By implementing the detection, this application also concludes that Figures 6 to 9 The trend graph shows that when it is necessary to reduce the coefficient of friction, that is, the volume of deionized water 300 added is less than or equal to 1 μL, and after adding deionized water 300, the speed of the first contact 100 is 0.08 m / s, and the load is in the range of 14-28 MPa.

[0095] in, Figure 6 This application provides a graph showing the trend of friction coefficient change over time when the friction coefficient is reduced. Figure 7 for Figure 6 A partially enlarged view shows the first contact element 100 with a velocity of 56.5 mm / s and a load of 3 N. (The last sentence appears to be incomplete and possibly refers to a different image or diagram.) Figure 6 and Figure 7 It can be concluded that during the running-in process, the coefficient of friction between the first contact 100 and the second contact 200 gradually decreases from 0.3 as the running-in time increases. When the friction surface is not irradiated with ultraviolet light and plasma water is added directly (i.e., the control group), the coefficient of friction between the first contact 100 and the second contact 200 eventually fluctuates around 0.019. When the friction surface is irradiated with ultraviolet light and then plasma water is added (i.e., the light-irradiated group), and the volume of the added deionized water 300 is less than or equal to 1 μL, the coefficient of friction between the first contact 100 and the second contact 200 decreases and eventually fluctuates around 0.0051.

[0096] Figure 8 This application provides a graph showing the change in relative velocity of the friction coefficient as the friction coefficient decreases, where the load is 3N. (The graph is presented in the original text.) Figure 8 It can be concluded that the coefficient of friction between the first contact 100 and the second contact 200 gradually decreases with increasing speed. At a speed of 40-80 mm / s, without ultraviolet light irradiation of the friction surface and with plasma water added directly (i.e., the control group), the coefficient of friction between the first contact 100 and the second contact 200 does not reach the super-lubricated range. However, after ultraviolet light irradiation of the friction surface followed by the addition of plasma water (i.e., the irradiated group), the coefficient of friction between the first contact 100 and the second contact 200 reaches the super-lubricated range, where the coefficient of friction is 0-0.01. Therefore, the method for controlling the coefficient of friction of water lubrication provided in this application can quickly bring the coefficient of friction to and stabilize it within the super-lubricated range.

[0097] Figure 9 The graph provided in this application shows the trend of friction coefficient relative to load when the friction coefficient is reduced, where the velocity is 56.5 mm / s. (By...) Figure 9 It can be concluded that when the load is in the range of 2-4N (corresponding to a pressure of 14-28MPa), without ultraviolet light irradiation of the friction surface and instead directly adding plasma water (i.e., the control group), the friction coefficient between the first contact 100 and the second contact 200 does not reach the super-lubricated range. However, after ultraviolet light irradiation of the friction surface followed by the addition of plasma water (i.e., the irradiated group), the friction coefficient between the first contact 100 and the second contact 200 reaches the super-lubricated range, where the friction coefficient is 0-0.01. Therefore, the method for controlling the water-lubricated friction coefficient provided in this application can quickly bring the friction coefficient to and stabilize it within the super-lubricated range.

[0098] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0099] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A method for controlling the coefficient of friction of water lubrication, used to control the coefficient of friction between a second contact and a first contact made of a photosensitive material, characterized in that, The method for adjusting the coefficient of friction of water lubrication includes: Make the first contact and the second contact contact; The second contact and the first contact are run-in in a sulfuric acid solution with a preset pH value. After rinsing the friction surface on the first contact member that is in contact with the second contact member, the friction surface is irradiated with ultraviolet light; Add deionized water to the friction surface; After exposure to light, the coefficient of friction between the first contact and the second contact increases by increasing the volume of the added deionized water. After exposure to light, the coefficient of friction between the first contact and the second contact is reduced by decreasing the volume of the added deionized water. A method for increasing the coefficient of friction between the first contact and the second contact includes adding deionized water in the range of 25-75 μL after light irradiation. A method for reducing the coefficient of friction between the first contact and the second contact and placing it within the range of 0-0.01 includes adding a volume of deionized water less than or equal to 1 μL after light irradiation.

2. The method for adjusting the coefficient of friction of water lubrication according to claim 1, characterized in that, Running the second contact and the first contact in a sulfuric acid solution with a preset pH value includes: Rotate the first contact relative to the second contact; During rotation, the load is 1N-8N and the speed is 30-180mm / s.

3. The method for adjusting the coefficient of friction of water lubrication according to claim 1, characterized in that, The break-in time is 10-15 minutes.

4. The method for adjusting the coefficient of friction of water lubrication according to claim 2 or 3, characterized in that, The preset pH value for the running-in process is in the range of 1-3.

5. The method for adjusting the coefficient of friction of water lubrication according to claim 1, characterized in that, After adding 25-75 μL of deionized water, the speed of the first contact element is 0.1-0.3 m / s, and the load is greater than 20 MPa.

6. The method for adjusting the coefficient of friction of water lubrication according to claim 1 or 5, characterized in that, When the volume of added deionized water is less than or equal to 1 μL, the speed of the first contact element is greater than 0.08 m / s, and the load range is 14-28 MPa.

7. The method for adjusting the coefficient of friction of water lubrication according to claim 1, characterized in that, The conditions for ultraviolet light irradiation include: Irradiation intensity is 60-110 mW / cm 2 The irradiation time is greater than 60 minutes, and the irradiation time is shorter as the irradiation intensity increases.

8. The method for adjusting the coefficient of friction of water lubrication according to claim 7, characterized in that, The wavelength of the ultraviolet light is 200-400nm.

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