Device and method for dynamically monitoring wear state of coating

Abstract

The invention provides a device and method for dynamically monitoring the wear state of a coating. The apparatus includes: a loading unit including a pin sample having a surface coated with a coating; the disc sample unit comprises a disc sample coated with a coating on the surface, the disc sample and the pin sample form a friction pair, and the disc sample and the pin sample are rubbed through rotation or reciprocating motion; the resistance measuring unit is used for dynamically measuring and recording the change rule of the resistance value of the coating between the disc sample and the pin sample along with time in real time in the friction process of the disc sample and the pin sample, and analyzing to obtain the wear state information of the coating in real time; the coating wear state information at least comprises a coating wear rate, a coating thickness, whether the coating is worn through or not, coating wear uniformity and whether abrasive wear exists or not. Compared with the prior art, the method has dynamic performance in measurement, and the abrasion state of the coating in the friction process can be monitored in real time; the result is rich, and various information of the coating state can be given.

Description

Technical Field

[0001] This disclosure relates to the field of coating wear analysis and friction performance testing technology, and more specifically, to an apparatus and method for dynamically monitoring the wear state of coatings. Background Technology

[0002] Friction and wear are significant forms of material and component failure. To reduce the damage caused by friction and wear, coatings are often applied to the surfaces of materials and components to increase their wear resistance and lubricity. Common coating materials include DLC, nitrides, and molybdenum disulfide. During service, under the influence of friction, the coating material gradually wears away until it fails. Coating failure will adversely affect mechanical equipment and components, causing serious consequences such as damage. Therefore, measuring the wear condition of coatings is of great importance.

[0003] Resistance is an inherent physical property of coating materials, and its measurement is simple. Therefore, characterizing the wear state of a coating through resistance is a direct and convenient method. Currently, some technologies exist for measuring coating resistance, but these technologies also have some limitations. For example, coating resistance measurements lack real-time capability, the coating wear state needs to be pre-correlated with the resistance value, and some only focus on whether the coating has penetrated through.

[0004] Measuring coating wear condition requires real-time measurement. If the mechanical equipment and components are stopped before assessing the coating wear condition using various methods, the results are delayed and inefficient. Coating materials are diverse; if the measurement requires pre-correlating the material wear condition with electrical resistance, this method has limited applicability. The coating wear process involves many changes, such as coating thickness and uniformity. Focusing solely on whether the coating is worn through provides a single evaluation metric and fails to assess the changes during the coating wear process.

[0005] In summary, there is an urgent need for a dynamic monitoring technology for coating wear state based on resistance measurement, which can realize real-time in-situ measurement, be universally applicable to different coating materials, and have a wealth of coating wear state evaluation indicators. Summary of the Invention

[0006] (a) Technical problems to be solved

[0007] In view of this, the main objective of this disclosure is to provide an apparatus and method for dynamically monitoring the wear state of a coating, so as to achieve real-time, universal, and comprehensive characterization of the wear state of the coating through a convenient resistance measurement method.

[0008] (II) Technical Solution

[0009] To achieve the above objectives, this disclosure provides an apparatus for dynamically monitoring the wear state of a coating, the apparatus comprising:

[0010] Loading unit 1 includes a pin sample 11 with a surface coating;

[0011] The disc sample unit 2 includes a disc sample 21 with a surface coating, and the disc sample 21 and the pin sample 11 form a friction pair. The disc sample 21 and the pin sample 11 are rubbed by rotation or reciprocating motion.

[0012] The resistance measurement unit 3 is used to dynamically measure and record the change law of the coating resistance value between the disc sample 21 and the pin sample 11 over time during the friction process, and to analyze and obtain coating wear state information in real time. The coating wear state information includes at least the coating wear rate, coating thickness, whether the coating is worn through, coating wear uniformity, and whether there is abrasive wear.

[0013] In the above scheme, the loading unit 1 further includes a weight load 12, a sample rod 13, a first terminal block 14, a first nut 15, and a second nut 16, wherein: the pin sample 11 is fixed to one end of the sample rod 13, and the other end of the sample rod 13 is equipped with the first terminal block 14, which is used to connect to the resistance measuring unit 3; the sample rod 13 has a thread in the middle, and the first nut 15 and the second nut 16 tighten and fix the weight load 12 to the sample rod 13 at the thread.

[0014] In the above scheme, the first terminal 14 is connected to the pin sample 11 and the sample rod 13 by a wire, so that the first terminal 14, the sample rod 13 and the pin sample 11 are at the same potential.

[0015] In the above scheme, the disk sample unit 2 further includes a motion mechanism 22 and a second terminal 23. The disk sample 21 with a surface coating is fixed on the motion mechanism 22. The motion mechanism 22 is capable of reciprocating or rotating, so that the disk sample 21 rubs against the pin sample 11. The second terminal 23 is installed on the motion mechanism 22 and is used to connect to the resistance measuring unit 3.

[0016] In the above scheme, the second terminal 23 is connected to the disk sample 21 by a wire, so that the disk sample 21 and the second terminal 23 are at the same potential.

[0017] In the above scheme, the resistance measuring unit 3 includes a digital multimeter 31 and two terminals 32. The digital multimeter 31 is connected to the first terminal 14 and the second terminal 23 respectively through the two terminals 32 and cables. The resistance measurement unit 31 measures and records the change of the coating resistance value between the disc sample 21 and the pin sample 11 over time using the resistance test range.

[0018] In the above scheme, the two terminals 32 are at the same potential as the pin sample 11 in the loading unit 1 and the disk sample 21 in the disk sample unit 2.

[0019] In the above scheme, the coatings applied to the surfaces of the pin sample 11 and the disc sample 21 are insulating coatings or semiconductor coatings.

[0020] To achieve the above objectives, this disclosure also provides a method for dynamically monitoring the wear state of a coating, using the aforementioned apparatus for dynamically monitoring the wear state of a coating, the method comprising:

[0021] A coating is applied to the surface of either the disc sample or the pin sample, and the disc sample and the pin sample are rubbed together by rotation or reciprocating motion.

[0022] Real-time dynamic measurement and recording of the change in coating resistance between the disc sample and the pin sample over time; and

[0023] The coating resistance value is analyzed in real time to obtain coating wear status information, which includes at least the coating wear rate, coating thickness, whether the coating is worn through, coating wear uniformity, and whether abrasive wear exists.

[0024] In the above scheme, in order to characterize the coating wear rate, coating thickness, and whether the coating has worn through in real time, the method includes:

[0025] After applying a coating to the surface of either the disc sample or the pin sample, the total coating thickness d is measured. 10 ;

[0026] Under a defined load and at rest, the pin specimen is brought into contact with the disc specimen, and the coating resistance value R between the disc specimen and the pin specimen is measured. 10 ;

[0027] The motion mechanism is activated to cause friction between the disc sample and the pin sample, and the coating resistance value R between the disc sample and the pin sample is continuously and in real time measured. 11 The time corresponding to each measurement is recorded as t. 11 ;

[0028] Calculate t 11 The wear rate of the coating at any given time is defined as (R 10 -R 11 ) / R 10 ×100%;

[0029] Calculate t 11 Coating thickness d at any time 11 Defined as R 11 / R 10 ×d 10 ;

[0030] Set the coating wear-through threshold resistance R 12 When R 11 ≤R 12 When, it is considered that the coating is in t 11 Time has worn it down.

[0031] In the above scheme, in order to characterize the coating wear uniformity and the presence of abrasive wear in real time, the method includes:

[0032] Start the motion mechanism to make the disc sample rub against the pin sample, continuously and in real time measure the coating resistance value between the disc sample and the pin sample, and record the resistance value and the corresponding time for each measurement.

[0033] Select a certain time period t 21 To t 22 Calculate the average resistance of all measured values ​​within this time period as R. 21 The standard deviation is R 22 ;

[0034] Calculate the time period t 21 To t 22 The relative standard deviation R of the coating resistance 22 / R 21 ×100% is the wear uniformity coefficient; the smaller the coating wear uniformity coefficient, the more uniform the coating wear and the smaller the coating undulation.

[0035] Select a certain time period t 23 To t 24 Calculate the average resistance of all measured values ​​within this time period as R. 23 The standard deviation is R 24 ;

[0036] For time period t 23 To t 24 At any time t 25 Its resistance value is denoted as R. 25 ;

[0037] Calculate any time t 25 The abrasive wear condition determination coefficient is defined as |R 25 -R 23 |;

[0038] Let the threshold be 2×R 24 When the abrasive wear condition determination coefficient is higher than the set threshold, the coating is considered to be at time t. 25 Abrasive wear exists.

[0039] (III) Beneficial Effects

[0040] As can be seen from the above technical solutions, the device and method for dynamically monitoring the wear state of coatings provided in this disclosure have at least the following beneficial effects:

[0041] 1. Compared with traditional coating resistance measurement methods, the device and method for dynamically monitoring coating wear state provided in this disclosure are dynamic and real-time, and can monitor coating wear state in real time during coating friction without stopping operation to perform measurement.

[0042] 2. Compared with traditional coating resistance measurement methods, the device and method for dynamically monitoring coating wear state provided in this disclosure have material universality, the coating material is applicable to semiconductor and insulating materials, and there is no need to determine the relationship between coating wear state and resistance value in advance, nor is there a need for prior calibration.

[0043] 3. Compared with traditional coating resistance measurement methods, the device and method for dynamically monitoring coating wear status provided in this disclosure have a rich variety of indicators. In addition to the common question of whether the coating is worn through, it can also obtain various coating wear status information such as coating wear rate, coating thickness, coating wear uniformity, and whether abrasive wear exists.

[0044] 4. Compared with traditional qualitative coating resistance measurement methods, the device and method for dynamically monitoring coating wear state provided in this disclosure offer a quantitative measurement method. Attached Figure Description

[0045] The foregoing contents, as well as other objects, features, and advantages of this disclosure, will become clearer from the following description of embodiments with reference to the accompanying drawings, in which:

[0046] Figure 1 This is a schematic diagram of an apparatus for dynamically monitoring the wear state of a coating according to an embodiment of the present disclosure.

[0047] Figure 2 The graph shows the measurement results of coating wear rate, coating thickness, and whether the coating is worn through, according to the embodiments of this disclosure.

[0048] Figure 3 It is a real-time change curve of the friction coefficient and the corresponding resistance value according to the embodiments of this disclosure. Detailed Implementation

[0049] The embodiments of the present disclosure will now be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the disclosure. In the following detailed description, numerous specific details are set forth to provide a thorough understanding of the embodiments of the present disclosure for ease of explanation. However, it will be apparent that one or more embodiments may be practiced without these specific details. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concepts of the present disclosure.

[0050] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this disclosure. The terms “comprising,” “including,” etc., as used herein indicate the presence of the stated features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0051] All terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein are to be interpreted in a manner consistent with the context of this specification, and not in an idealized or overly rigid way.

[0052] To achieve real-time in-situ measurement, be universally applicable to different coating materials, and have a wealth of coating wear condition evaluation indicators, this disclosure provides a device for dynamically monitoring coating wear condition.

[0053] like Figure 1 As shown, Figure 1 This is a schematic diagram of an apparatus for dynamically monitoring the wear state of a coating according to an embodiment of the present disclosure. The apparatus includes a loading unit 1, a disc sample unit 2, and a resistance measurement unit 3. The loading unit 1 includes a pin sample 11 with a surface coating, and the disc sample unit 2 includes a disc sample 21 with a surface coating. The disc sample 21 and the pin sample 11 form a friction pair, and friction is generated between them through rotation or reciprocating motion. The resistance measurement unit 3 is used to dynamically measure and record the change in coating resistance between the disc sample 21 and the pin sample 11 over time during the friction process, and to analyze and obtain coating wear state information in real time. This coating wear state information includes at least the coating wear rate, coating thickness, whether the coating is worn through, coating wear uniformity, and the presence of abrasive wear.

[0054] Please refer to Figure 1The loading unit 1 further includes a weight load 12, a sample rod 13, a first terminal block 14, a first nut 15, and a second nut 16. The pin sample 11 is fixed to one end of the sample rod 13, and the other end of the sample rod 13 is fitted with the first terminal block 14, which is used to connect to the resistance measuring unit 3. The pin sample 11 may or may not be coated and forms a friction pair with the disc sample 21 in direct contact. The coating on the surface of the pin sample 11 is an insulating coating or a semiconductor coating. The weight load 12 is one or more metal weight plates with a defined weight. The sample rod 13 has threads in its middle, and the first nut 15 and the second nut 16 tighten the weight load 12 to the sample rod 13 at the threads. The first terminal block 14 is connected to the pin sample 11 and the sample rod 13 via a wire, ensuring that the first terminal block 14, the sample rod 13, and the pin sample 11 are at the same potential.

[0055] Preferably, to avoid wire entanglement during sample rotation, the connection between the first terminal 14 and the sample rod 13 can be changed from a direct connection to a connection via a conductive slip ring. The first terminal 14 is connected to the sample rod 13 and the pin sample 11 via wires, so that the first terminal 14, the sample rod 13, and the pin sample 11 are at the same potential.

[0056] More preferably, the sample rod 13 can be processed into a hollow structure to accommodate the wires connecting the first terminal 14, the sample rod 13, and the pin sample 11.

[0057] Please refer to Figure 1 The disc sample unit 2 further includes a motion mechanism 22 and a second terminal 23. The disc sample 21 is made of metal and coated with an insulating or semiconductor coating. The disc sample 21 is fixed to the motion mechanism 22; the disc sample 21 and the pin sample 11 form a friction pair, and the motion mechanism 22 can reciprocate or rotate, causing the disc sample 21 to rub against the pin sample 11; the second terminal 23 is mounted on the motion mechanism 22 and is used to connect to the resistance measuring unit 3. The second terminal 23 is connected to the uncoated metal substrate of the disc sample 21 via a wire, ensuring that the disc sample 21 and the second terminal 23 are at the same potential. Preferably, to avoid wire entanglement during the rotation of the disc sample 21, the connection between the second terminal 23 and the disc sample 21 can be changed from a direct wire connection to a connection via a conductive slip ring. The second terminal 23 is connected to the resistance measuring unit 3 via a wire.

[0058] Please refer to Figure 1The resistance measuring unit 3 includes a digital multimeter 31 and two terminals 32. The digital multimeter 31 is connected to the first terminal 14 and the second terminal 23 respectively via the two terminals 32 and a cable 33. It measures and records the change in coating resistance between the disc sample 21 and the pin sample 11 over time using the resistance test setting. The two terminals 32 are at the same potential as the pin sample 11 in the loading unit 1 and the disc sample 21 in the disc sample unit 2. The coatings on the surfaces of the pin sample 11 and the disc sample 21 are insulating or semiconductor coatings.

[0059] based on Figure 1 The schematic diagram shown is of an apparatus for dynamically monitoring the wear state of a coating according to an embodiment of the present disclosure. The following describes in detail a method for dynamically monitoring the wear state of a coating using this apparatus, which includes:

[0060] Step S1: Apply a coating to the surface of either the disc sample or the pin sample, and rotate or reciprocate to make the disc sample rub against the pin sample.

[0061] In this step, an insulating or semiconductor coating is applied to the surface of the disc sample 21 in disc sample unit 2 and / or the pin sample 11 in loading unit 1; the weight of the weight load 12 is determined, and the pin sample 11 and the weight load 12 are connected and fixed to the sample rod 13; the disc sample 21 is fixed to the motion mechanism 22; the sample rod 13 is fixed so that the pin sample 11 and the disc sample 21 are in contact and form a friction pair; the cables and terminals (such as 14, 23, 32, 33) are connected; the resistance value of the digital multimeter 31, i.e., the static resistance value of the coating, is measured when the motion mechanism 22 is not started; the motion mechanism 22 is started, and the disc sample 21 and the pin sample 11 are rubbed together by rotation or reciprocating motion.

[0062] Step S2: Measure and record the change in coating resistance between the disc sample and the pin sample over time in real time.

[0063] This step involves using a digital multimeter 31 to measure the dynamic resistance of the coating and recording the value over time.

[0064] Step S3: Analyze the change of coating resistance value over time in real time to obtain coating wear status information. This coating wear status information includes at least the coating wear rate, coating thickness, whether the coating is worn through, coating wear uniformity, and whether abrasive wear exists.

[0065] Example 1:

[0066] This embodiment 1 provides a method for dynamically monitoring the wear state of a coating, which can characterize the coating wear rate, coating thickness, and whether the coating has worn through in real time. The measurement results are as follows: Figure 2 As shown.

[0067] The pin sample material is 0Cr13Ni8Mo2Al, and the disc sample material is 05Cr17Ni4Cu4Nb. A MoS2 coating is applied to the surface of both the pin and disc samples, with a total coating thickness of approximately 20 μm.

[0068] The experimental setup was configured with a weight load of 1500g, a rotation mechanism with a rotation speed of 100rpm, and a distance of 4mm between the pin sample and the center of the disc sample.

[0069] Under a defined load and at rest, the pin specimen is brought into contact with the disc specimen, and the coating resistance between the disc specimen and the pin specimen is measured to be 6 × 10⁻⁶. 5 Ω.

[0070] The motion mechanism is activated to cause friction between the disc sample and the pin sample, and the coating resistance value and time between the disc sample and the pin sample are continuously and in real time measured.

[0071] Taking the moment 20 minutes after the motion mechanism is started as an example, the coating resistance at this moment is 1.8 × 10⁻⁶. 5 Ω, then the coating wear rate can be calculated [(6×10 5 Ω-1.8×10 5 Ω) / 6×10 5 Ω]×100%=70%;

[0072] Taking the moment 20 minutes after the motion mechanism is started as an example, the coating thickness at this moment can be calculated as (1.8 × 10⁻⁶). 5 Ω) / (6×10 5 Ω)×20μm=6μm;

[0073] The coating wear-through threshold resistance is set to 100Ω. If the coating resistance is less than 100Ω 155 minutes after the motion mechanism is started, the coating is considered to have worn through 155 minutes after the motion mechanism is started.

[0074] Example 2:

[0075] This embodiment 1 provides a method for dynamically monitoring the wear state of a coating, which can characterize the wear uniformity and the presence of abrasive wear in real time. The measurement results are as follows: Figure 3 As shown.

[0076] The pin sample material is TC16, and the disc sample material is TC4. Both the pin sample and the disc sample have a pulsed anodized layer with a total thickness of about 20 μm.

[0077] The experimental setup was configured with a weight load of 250g, a rotation mechanism with a rotation speed of 100rpm, and a distance of 4mm between the pin sample and the center of the disc sample.

[0078] The motion mechanism is activated to cause friction between the disc sample and the pin sample, and the coating resistance value and time between the disc sample and the pin sample are continuously and in real time measured.

[0079] Selected time period 1: 1 minute to 2 minutes after the motion mechanism is started, the average resistance of all measured values ​​during this period is calculated to be 3.1 × 10⁻⁶. 6 Ω, with a standard deviation of 1.9 × 10 6 Ω;

[0080] The relative standard deviation of the coating resistance from 1 min to 2 min after the start of the motion mechanism is calculated as the wear uniformity coefficient, i.e., (1.9 × 10⁻⁶). 6 Ω) / (3.1×10 6 Ω) × 100% = 61%;

[0081] Selected time period 2: 3 to 4 minutes after the motion mechanism is started, the average resistance of all measured values ​​during this period is calculated to be 1.5 × 10⁻⁶. 6 Ω, with a standard deviation of 0.4 × 10 6 Ω;

[0082] The relative standard deviation of the coating resistance from 3 to 4 minutes after the start of the motion mechanism is calculated as the wear uniformity coefficient, i.e., (0.4 × 10⁻⁶). 6 Ω) / (1.5×10 6 Ω) × 100% = 27%;

[0083] Compared to time period 1, the coating wear in time period 2 is more uniform and the coating undulations are smaller.

[0084] Selected time period 3: 7 min to 7.5 min after the motion mechanism is started, calculate the average resistance of all measured values ​​during this period as 2.5 × 10⁻⁶. 4 Ω, with a standard deviation of 2.3 × 10 4 Ω;

[0085] At 7.1 minutes after the motion mechanism was started within time period 3, its resistance value was 9.3 × 10⁻⁶. 4 Ω;

[0086] The abrasive wear condition determination coefficient was calculated at 7.1 minutes after the start of the motion mechanism, and it was |9.3×10 4 Ω-2.5×10 4 Ω|=6.8×10 4 Ω;

[0087] At this point, the abrasive wear condition determination coefficient is higher than the set threshold (e.g., 2×2.3×10). 4 Ω=4.6×10 4 (Ω), which can be considered as the coating experiencing abrasive wear at this moment.

[0088] Therefore, compared with traditional coating resistance measurement devices and methods, the device and method for dynamically monitoring coating wear state provided in this disclosure are dynamic and real-time, capable of monitoring coating wear state in real time during coating friction without requiring a shutdown for measurement. The device and method for dynamically monitoring coating wear state provided in this disclosure have material universality; the coating materials are applicable to semiconductors and insulating materials, and there is no need to pre-determine the relationship between coating wear state and resistance value, nor is pre-calibration required. The device and method for dynamically monitoring coating wear state provided in this disclosure offer a rich set of indicators; in addition to the common question of whether the coating is worn through, it can also obtain information on coating wear rate, coating thickness, coating wear uniformity, and the presence of abrasive wear, among other coating wear state information. The device and method for dynamically monitoring coating wear state provided in this disclosure offer a quantitative measurement method.

[0089] Those skilled in the art will understand that the features described in the various embodiments of this disclosure can be combined and / or combined in various ways, even if such combinations or combinations are not explicitly described in this disclosure. In particular, the features described in the various embodiments of this disclosure can be combined and / or combined in various ways without departing from the spirit and teachings of this disclosure. All such combinations and / or combinations fall within the scope of this disclosure.

[0090] The embodiments of this disclosure have been described above. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of this disclosure. Although various embodiments have been described above, this does not mean that the measures in the various embodiments cannot be used advantageously in combination. Various substitutions and modifications can be made by those skilled in the art without departing from the scope of this disclosure, and all such substitutions and modifications should fall within the scope of this disclosure.

Claims

1. A device for dynamically monitoring the wear state of a coating, characterized in that, The device includes: The loading unit (1) includes a pin sample (11) with a surface coating. The disc sample unit (2) includes a disc sample (21) with a surface coating, and the disc sample (21) and the pin sample (11) form a friction pair, and the disc sample (21) and the pin sample (11) are rubbed by rotation or reciprocating motion. The resistance measurement unit (3) is used to measure and record the change law of the coating resistance value between the disc sample (21) and the pin sample (11) over time during the friction process, and analyze the coating wear status information in real time. The coating wear status information includes at least the coating wear rate, coating thickness, whether the coating is worn through, coating wear uniformity, and whether there is abrasive wear.

2. The device for dynamically monitoring coating wear status according to claim 1, characterized in that, The loading unit (1) further includes a weight load (12), a sample rod (13), a first terminal block (14), a first nut (15), and a second nut (16), wherein: The pin sample (11) is fixed to one end of the sample rod (13), and the other end of the sample rod (13) is equipped with a first terminal (14), which is used to connect to the resistance measuring unit (3). The sample rod (13) has a thread in the middle, and the first nut (15) and the second nut (16) tighten and fix the weight load (12) to the sample rod (13) at the thread.

3. The device for dynamically monitoring coating wear state according to claim 2, characterized in that, The first terminal (14) is connected to the pin sample (11) and the sample rod (13) by a wire, so that the first terminal (14), the sample rod (13) and the pin sample (11) are at the same potential.

4. The device for dynamically monitoring coating wear status according to claim 1, characterized in that, The disc sample unit (2) also includes a motion mechanism (22) and a second terminal block (23). The disk sample (21) with the surface coating is fixed on the motion mechanism (22); The motion mechanism (22) is capable of reciprocating or rotating motion, causing the disc sample (21) to rub against the pin sample (11); The second terminal (23) is mounted on the motion mechanism (22) for connection to the resistance measuring unit (3).

5. The device for dynamically monitoring coating wear state according to claim 4, characterized in that, The second terminal (23) is connected to the disc sample (21) by a wire, so that the disc sample (21) and the second terminal (23) are at the same potential.

6. The device for dynamically monitoring coating wear state according to claim 1, characterized in that, The resistance measuring unit (3) includes a digital multimeter (31) and two terminals (32). The digital multimeter (31) is connected to the first terminal (14) and the second terminal (23) respectively through the two terminals (32) and cables. The resistance test range is used to measure and record the change law of the coating resistance value between the disc sample (21) and the pin sample (11) over time.

7. The device for dynamically monitoring coating wear state according to claim 6, characterized in that, The two terminals (32) are at the same potential as the pin sample (11) in the loading unit (1) and the disc sample (21) in the disc sample unit (2).

8. The device for dynamically monitoring coating wear state according to claim 1, characterized in that, The coatings applied to the surfaces of the pin sample (11) and the disc sample (21) are insulating coatings or semiconductor coatings.

9. A method for dynamically monitoring the wear state of a coating, using the apparatus according to any one of claims 1 to 8, characterized in that, The method includes: A coating is applied to the surface of either the disc sample or the pin sample, and the disc sample and the pin sample are rubbed together by rotation or reciprocating motion. Real-time dynamic measurement and recording of the change in coating resistance between the disc sample and the pin sample over time; and The coating resistance value is analyzed in real time to obtain coating wear status information, which includes at least the coating wear rate, coating thickness, whether the coating is worn through, coating wear uniformity, and whether abrasive wear exists.

10. The method for dynamically monitoring the wear state of a coating according to claim 9, characterized in that, To characterize coating wear rate, coating thickness, and whether the coating has worn through in real time, the method includes: After applying a coating to the surface of either the disc sample or the pin sample, the total coating thickness d is measured. 10 ; Under a defined load and at rest, the pin specimen is brought into contact with the disc specimen, and the coating resistance value R between the disc specimen and the pin specimen is measured. 10 ; The motion mechanism is activated to cause friction between the disc sample and the pin sample, and the coating resistance value R between the disc sample and the pin sample is continuously and in real time measured. 11 The time corresponding to each measurement is recorded as t. 11 ; Calculate t 11 The wear rate of the coating at any given time is defined as (R 10 -R 11 ) / R 10 ×100%; Calculate t 11 Coating thickness d at any time 11 Defined as R 11 / R 10 ×d 10 ; Set the coating wear-through threshold resistance R 12 When R 11 ≤R 12 When, it is considered that the coating is in t 11 Time has worn it down.

11. The method for dynamically monitoring the wear state of a coating according to claim 9, characterized in that, To characterize the coating wear uniformity and the presence of abrasive wear in real time, the method includes: Start the motion mechanism to make the disc sample rub against the pin sample, continuously and in real time measure the coating resistance value between the disc sample and the pin sample, and record the resistance value and the corresponding time for each measurement. Select a certain time period t 21 To t 22 Calculate the average resistance of all measured values ​​within this time period as R. 21 The standard deviation is R 22 ; Calculate time period t 21 To t 22 The relative standard deviation R of the coating resistance 22 / R 21 ×100% is the wear uniformity coefficient; the smaller the coating wear uniformity coefficient, the more uniform the coating wear and the smaller the coating undulation. Select a certain time period t 23 To t 24 Calculate the average resistance of all measured values ​​within this time period as R. 23 The standard deviation is R 24 ; For time period t 23 To t 24 At any time t 25 Its resistance value is denoted as R. 25 ; Calculate any time t 25 The abrasive wear condition determination coefficient is defined as |R 25 -R 23 |; Let the threshold be 2×R 24 When the abrasive wear condition determination coefficient is higher than the set threshold, the coating is considered to be at time t. 25 Abrasive wear exists.

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