A method for evaluating the abrasibility of an oil and gas seal coating used in conjunction with a gauze

Abstract

The present application belongs to the technical field of aerospace abradable seal coating, and particularly relates to a kind of oil and gas seal coating abradability evaluation method matched with a labyrinth, comprising: installing a simulated labyrinth sample and an oil and gas seal coating sample after installation; the simulated labyrinth sample and the oil and gas seal coating sample are heated to a set temperature, the wheel disc reaches a set rotating speed and is stably operated, then the platform drives the oil and gas seal coating sample to move to the wheel disc at a set feed rate to a set feed depth, and stops feeding to make the labyrinth tip penetrate into the coating; the abradability grade under each working condition is determined according to the observation results, the abradability grade is filled in the grade evaluation table, and the applicable working condition range of the oil and gas seal coating is determined according to the summary results. The present application combines the grade evaluation method and the width comparison method to comprehensively evaluate the abradability of the coating, which can economically evaluate the matching of the labyrinth-coating system and provide prospective technical guidance for the part material selection and size gap design of the labyrinth seal device.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of aerospace abradable seal coating, and particularly relates to a method for evaluating the abradability of oil and gas seal coating matched with a labyrinth. BACKGROUND

[0002] Turbomachinery has a relatively perfect gas path and oil path sealing system, and a small leakage loss can reduce the gas leakage loss, improve the overall efficiency, and reduce the oil consumption rate. Labyrinth sealing devices are widely used in the gas path and oil path sealing system of turbomachinery due to their simple structure, easy maintenance, low cost, and high reliability, etc. For example, bearing cavities and cooling flow path systems.

[0003] The oil system of turbomachinery usually adopts a labyrinth sealing device as a sealing component to seal the oil pool of the lubricated bearing, thereby ensuring that the turbomachinery does not have a large oil leakage during operation. The labyrinth sealing device mainly uses the clearance throttling between the labyrinth tooth tip and the sealing stator and the vortex in the tooth cavity to increase the flow resistance of the channel to limit the leakage of the fluid, thereby playing a role in gas path and oil path sealing. As shown in Figure 1 The typical labyrinth sealing structure mainly consists of a stator with an abradable sealing coating and a rotor with a labyrinth structure (the black position in the figure is the sealing coating). The labyrinth, as a rotating part, forms a friction pair with the stator case to jointly play a role in oil and gas sealing. The sealing coating prepared on the surface of the stator case can better control the gap between the rotor (labyrinth) and the stator (case) and improve the oil and gas sealing effect by being ground against the labyrinth.

[0004] Because the turbomachinery has extremely harsh requirements for sealing loss, the labyrinth tooth tip throttling gap is also continuously reduced, and the rotor part is operated for a long time under high speed, high temperature, high pressure, and multi-state cycle conditions. The collision and grinding between the rotor and stator parts are inevitable. Therefore, the abradable sealing coating coated on the surface of the stator part is very important. After the turbomachinery has been operated for a period of time, the abradable sealing coating may have wear grooves or peeling, and these coating abnormalities are directly related to the performance of the labyrinth sealing device. The abradable sealing coating, which is generally a metal matrix composite, is composed of a metal phase, a non-metal phase, and a pore. Good abradability is an important performance of the abradable sealing coating. When the abradable sealing coating is applied to turbomachinery, the coating should be preferentially abraded when the rotor labyrinth collides with the coating; secondly, the coating scratches should be smooth and in proportion to the shape of the labyrinth, so that the rotor labyrinth and the stator coating maintain a small gap to achieve the purpose of gas path or oil path sealing; finally, the coating abrasive generated by the scratches should be small and loose, and should not damage the downstream components or bearings.

[0005] Currently, the abradability evaluation of the abradable sealing coating is all for the coating-blade friction pair (such as Figure 2The performance evaluation is shown in the figure, and the evaluation method mainly includes IDR (high wear ratio), IQR (deep wear ratio), deep contrast method and other indexes. SUMMARY

[0006] In view of the deficiencies of the prior art, the present application provides an oil and gas sealing coating wearability evaluation method matched with a labyrinth, which adopts a combination of grade evaluation method and width contrast method to comprehensively evaluate the wearability of the coating, can economically evaluate the matching of the labyrinth-coating system, and provides prospective technical guidance for the selection of part materials and the design of size gaps of the labyrinth sealing device.

[0007] The specific technical solutions are as follows: An oil and gas sealing coating wearability evaluation method matched with a labyrinth, comprising the following steps: Step S1, installing a simulated labyrinth sample on the outer edge of a high-speed rotatable wheel disc, and installing an oil and gas sealing coating sample on a platform capable of advancing and retreating relative to the wheel disc; Step S2, heating the simulated labyrinth sample and the oil and gas sealing coating sample to a set temperature, and controlling the wheel disc to rotate at a set wheel disc speed and stably run; Step S3, after the wheel disc reaches the set speed and stably runs, the platform drives the oil and gas sealing coating sample to move towards the wheel disc at a set feed rate, and when the feed movement reaches a set feed depth, the feed is stopped, so that the labyrinth tip penetrates into the coating, and high-speed collision and abrasion of the simulated labyrinth sample and the oil and gas sealing coating sample are formed; Step S4, observing the surface state of the oil and gas sealing coating after collision and abrasion, determining the wearability grade under each working condition according to the observation results, filling the wearability grade under each working condition into a grade evaluation table, and determining the applicable working condition range of the oil and gas sealing coating according to the summary results in the grade evaluation table.

[0008] The grade evaluation table includes a plurality of working condition combinations, and a wearability grade corresponding to each working condition combination, respectively; The working condition combination includes at least three parameter dimensions of linear speed, feed depth and test temperature, and each parameter dimension is provided with a plurality of levels.

[0009] The determination of the wearability grade under each working condition in step S4 includes the following steps: Step S4.1, formulating a wearability performance grade, which is divided into a plurality of grades according to the wearability, and each grade corresponds to a different wearability degree; Step S4.2, carrying out a collision and abrasion test for each group of working condition combinations, and adopting a width contrast method to compare the abrasion mark morphology of the coating sample surface after collision and abrasion with a preset standard comparison template; Step S4.3, determining the abradability grade of the oil and gas sealing coating corresponding to the current working condition combination based on the comparison result of the width contrast method.

[0010] The preset standard comparison template comprises a main abrasion runway, a coating crushing area and an un-abraded area. The main abrasion runway corresponds to the position of the abrasion trace formed by the collision and abrasion between the simulated baffle tooth tip and the oil and gas sealing coating. The coating crushing area corresponds to the position of the crushing area formed by the collision and abrasion between the simulated baffle tooth tip and the oil and gas sealing coating. The un-abraded area corresponds to the position of the coating surface which does not collide and abrade with the simulated baffle tooth tip. The preset standard comparison template is further provided with a middle line between adjacent main abrasion runways.

[0011] The abradability grade comprises an unqualified grade, a qualified grade and an excellent grade. The unqualified grade is that the coating surface crushing area after collision and abrasion exceeds the middle line between adjacent main abrasion runways and is connected with the adjacent main abrasion runway; or the coating peels off and cannot show the main abrasion runway. The qualified grade is that the coating surface crushing area after collision and abrasion exceeds the middle line between adjacent main abrasion runways but is not connected with the adjacent main abrasion runway. The excellent grade is that the coating surface crushing area after collision and abrasion does not exceed the middle line between adjacent main abrasion runways.

[0012] The material of the simulated baffle sample is high-temperature alloy, and the top end of the simulated baffle sample is provided with not less than 3 levels of baffle teeth.

[0013] The top end of the simulated baffle sample is provided with a tooth end platform.

[0014] Each level of the simulated baffle sample is provided with a chamfer on both sides.

[0015] The material of the oil and gas sealing coating sample is high-temperature alloy or titanium alloy, and the coating thickness is greater than 0.5 mm.

[0016] The linear velocity of the baffle tooth tip is calculated according to the rotating speed of the wheel disc, and the linear velocity of the baffle tooth tip is taken as the working condition of this collision and abrasion test.

[0017] The beneficial effects of the present application are: the prior art can only evaluate the matching of the turbine blade and the sealing coating to the grinding situation, and cannot evaluate the matching of the turbine oil and gas sealing position screen and the sealing coating, the oil and gas sealing coating wearability evaluation method matched with the screen can comprehensively evaluate the wearability of the coating by combining the grade evaluation method and the width comparison method, the grade evaluation table containing multiple linear velocities, feed depths and test temperatures is constructed, the wearability grade of the oil and gas sealing coating under different working condition combinations can be comprehensively reflected, and prospective technical guidance is provided for the part material selection and size gap design of the screen sealing device; meanwhile, the present application can be implemented only by using conventional high-speed impact test equipment, and the test does not need to be carried out in the turbine whole machine state, so that the coating experiment cost is greatly reduced, the matching of the screen-coating system is economically evaluated, and an evaluation method close to the working condition is provided. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a schematic diagram of the screen-abradable sealing coating friction pair structure. Figure 2 It is a schematic diagram of the blade-abradable sealing coating friction pair structure. Figure 3 It is a schematic diagram of the simulated screen sample profile structure in the present application. Figure 4a It is a schematic diagram of the simulated screen sample top end structure in the present application Figure 1 . Figure 4b It is a schematic diagram of the simulated screen sample top end structure in the present application Figure 2 . Figure 5 It is an abradable wearability width comparison method evaluation diagram of the oil and gas sealing coating matched with the screen in the present application. Figure 6a It is a real object diagram before the abradable test of the GH4169 simulated screen in the embodiment of the present application. Figure 6b It is a real object diagram before the abradable test of the plasma sprayed silver copper oil and gas sealing coating in the embodiment of the present application. Figure 6c It is a real object diagram after the abradable test of the GH4169 simulated screen and the plasma sprayed silver copper oil and gas sealing coating in the embodiment of the present application. Figure 7 It is a measured diagram of the grade 1 in the width comparison method in the embodiment of the present application. Figure 8 It is a measured diagram of the grade 0.5 in the width comparison method in the embodiment of the present application. Figure 9 It is a measured diagram of the grade 0 in the width comparison method in the embodiment of the present application Figure 1 . Figure 10The measured width contrast method of the embodiment of the present application is used for the grade 0 Figure 2 ; In the figure, 1, chamfer; 2, simulated grate sample; 3, clamping position. DETAILED DESCRIPTION

[0019] In order to better explain the present application, the technical solutions and effects of the present application are described in detail in the specific embodiments below, combined with the drawings, so as to be better understood.

[0020] The embodiment discloses a method for evaluating the abradability of an oil and gas sealing coating used in combination with a grate, comprising the following steps: Step S1, installing a simulated grate sample on the outer edge of a high-speed rotatable wheel disc, and installing an oil and gas sealing coating sample on a platform that moves forward and backward relative to the wheel disc; Step S2, heating the simulated grate sample and the oil and gas sealing coating sample to a set test temperature, rotating the wheel disc at a set wheel disc rotating speed and stably operating, and determining the set wheel disc rotating speed according to the set linear speed of the tooth tip of the grate sample.

[0021] Step S3, after the wheel disc reaches the set rotating speed and stably operates, the platform drives the oil and gas sealing coating sample to move towards the wheel disc at a set feeding rate, and stops feeding when the feeding movement of the platform reaches a set feeding depth, so that the tooth tip invades the inside of the coating and forms high-speed collision and abrasion of the simulated grate sample and the oil and gas sealing coating sample. Step S4, observing the surface state of the oil and gas sealing coating after collision and abrasion, determining the abradable grade under each working condition according to the observation results, filling the abradable grade under each working condition into a grade evaluation table, and determining the applicable working condition range of the oil and gas sealing coating according to the summary results in the grade evaluation table.

[0022] In the embodiment, the feeding rate, the feeding depth and the wheel disc rotating speed are controlled by a stepping motor.

[0023] The high-temperature high-speed impact test of the abradable coating is carried out, the simulated labyrinth test sample 2 is clamped on the outer edge of the wheel disc which can rotate at high speed, the oil and gas sealing coating sample is clamped on the platform which can move forward and backward relative to the wheel disc, the oil and gas sealing coating sample and the simulated labyrinth test sample 2 can be heated to the set test temperature, under the condition that the wheel disc rotates at the set speed and is stable, the platform drives the oil and gas sealing coating sample to move to the wheel disc at the set feed rate, so as to realize the high-temperature high-speed impact of the simulated labyrinth test sample 2 and the oil and gas sealing coating sample. In the test, the feed depth is controlled by controlling the feed rate and the feed time, and the feed rate is generally controlled by a stepping motor; and the feed time needs to be accurately obtained to realize accurate control, and the impact zero point refers to the position of the initial contact between the simulated labyrinth test sample 2 and the oil and gas sealing coating sample, which is determined by a contact type mechanical sensor, and the contact type sensor is electrically connected with the PLC; when the sensor value reaches 1N, the PLC determines that the labyrinth test sample and the oil and gas sealing coating sample are in initial contact.

[0024] The material of the simulated labyrinth test sample is a high-temperature alloy, and the top end of the simulated labyrinth test sample is provided with no less than three levels of labyrinths. In this embodiment, the material of the simulated labyrinth test sample is a high-temperature alloy, as shown in FIG. 1, the top end of the simulated labyrinth test sample has at least three levels of labyrinths, and the number of levels can be increased according to the working conditions. More than three levels of labyrinths are more close to the actual labyrinth sealing device structure of the turbine machinery, and can more truly simulate the impact process of the labyrinth and the oil and gas sealing coating under the actual working condition. At the same time, there are narrow gaps between the multiple labyrinths, which can effectively evaluate the abradability of the oil and gas sealing coating in the extrusion state, and more comprehensively evaluate the abrasion of the coating under the actual condition. The feed rate, the penetration depth and the wheel speed are controlled by a stepping motor in the test, and the precision meets the test requirements. Figure 3

[0025] The top end of the simulated labyrinth test sample is provided with a tooth end platform. Each level of the simulated labyrinth test sample is provided with a chamfer 1 on both sides. The top end labyrinth structure of the simulated labyrinth test sample and the clamping position 3 at the bottom end can be adaptively adjusted according to different test machines. In this embodiment, as shown in FIG. 1, the top end of the simulated labyrinth test sample is provided with a tooth end platform with a width of 0.3 mm, and the width of the tooth end platform can be set to other widths according to actual test requirements. At the same time, each level of the simulated labyrinth test sample is provided with a chamfer 1 on both sides. By providing the tooth end platform at the top end of the simulated labyrinth test sample and the chamfers 1 on both sides, the simulated labyrinth test sample can be abraded with the oil and gas sealing coating, and the sharp labyrinth sharp corners are prevented from scratching the coating, so that the impact form between the actual labyrinth and the coating can be more truly simulated. Figure 4a Figure 4b

[0026] The material of the oil and gas sealing coating sample is a high-temperature alloy or a titanium alloy, and the thickness of the coating is greater than 0.5 mm. The coating can be prepared by a thermal spraying method, or can be prepared by other methods, and the types of the coating are generally silver-copper coating, aluminum-silicon polyphenyl ester coating and nickel-coated graphite coating. ​​​

[0027] High temperature in the present application refers to the heating temperature of the to-be-tested seal coating and the simulation blade, which is room temperature to 600 DEG C, and the temperature range corresponds to the working temperature of the oil-gas sealing position. The tip line speed of the simulation blade is 100 m / s-450 m / s, and the speed range corresponds to the line speed when the oil-gas sealing position works. The feed depth is 0.1 mm-0.8 mm, and the feed depth range corresponds to the depth of the baffle when the oil-gas sealing position works.

[0028] The oil-gas seal coating wearability evaluation method used in combination with the baffle in the present application adopts a combination of grade evaluation method and width comparison method, which is different from the IDR comparison method (high wear ratio) and the IQR comparison method (depth wear ratio) evaluation methods used in the existing blade-coating system. In the baffle-coating wear system, the baffle generally needs to be high-strength high-temperature alloy material, and the coating worn with the baffle is soft metal material. In the baffle-coating system, the baffle will not be worn, but the coating will be worn. Therefore, in the baffle-coating wear scenario, the wear amount of the baffle is zero, and the wear height or wear depth should not be used to evaluate whether the coating is excellent, but the wear morphology of the coating should be evaluated to determine whether the coating matches the baffle. Therefore, the present application adopts a combination of grade evaluation method and width comparison method, and comprehensively evaluates the wear morphology of the coating to more accurately determine the matching of the coating and the baffle.

[0029] The grade evaluation table includes a plurality of working condition combinations, and a wearability grade corresponding to each working condition combination; The working condition combination includes at least three parameter dimensions of line speed, feed depth and test temperature, and each parameter dimension is provided with a plurality of levels.

[0030] Specifically, in the present embodiment, the line speed is set to 100 m / s, 150 m / s and 200 m / s, respectively corresponding to Table 1, Table 2 and Table 3. Different feed depths and test temperatures are set under each line speed condition to obtain a plurality of different working condition combinations, and the wearability grade under the set line speed, feed depth and test temperature conditions is evaluated.

[0031] Table 1 Oil-gas seal coating wearability grade evaluation table under 100 m / s line speed (example)

[0032] Table 2 Oil-gas seal coating wearability grade evaluation table under 150 m / s line speed (example)

[0033] Table 3 Oil-gas seal coating wearability grade evaluation table under 200 m / s line speed (example)

[0034] In step S4, determining the wearability grade under each working condition includes the following steps: Step S4.1: Determine the abrasion performance level. The level is divided into several levels according to the quality of abrasion, and each level corresponds to a different degree of abrasion. Specifically, wearability grades are defined, with three values: 0, 0.5, and 1.

[0035] Step S4.2: Conduct impact abrasion tests for each set of working conditions, and use the width comparison method to compare the abrasion morphology of the coating sample surface after impact abrasion with the preset standard comparison template. Specifically, the width comparison method is used, that is, the actual wear test results of "flanged teeth-coating" are compared with the evaluation chart, as shown in the evaluation chart. Figure 5 As shown.

[0036] Figure 5 In the middle, the black stripe represents the main wear track, which is a clear trace of wear formed between the tip of the comb and the oil-gas sealing coating. Figure 5 In the middle, the gray area represents the coating breakage zone, which is a simulated breakage zone formed by the coating and tooth tip rubbing against each other during the wear process of the comb tooth tip and the oil and gas sealing coating. This mark is irregular in shape. If the coating has good abrasion resistance, the breakage zone is small. If the coating has poor abrasion resistance, the coating is very easy to crack or peel off. Figure 5 In the diagram, the white area represents the unworn coating. Due to the small size of the tooth tips, most of the oil and gas sealing coating tested did not rub against the teeth.

[0037] Figure 5 In the middle, the dotted line is the center line between adjacent main wear tracks.

[0038] Step S4.3: Based on the comparison results of the width comparison method, determine the wear resistance level of the oil-gas sealing coating under the current operating condition combination; specifically as follows: 1) Grade 0: After testing with simulated toothed teeth, if the broken area of ​​the oil-gas sealing coating exceeds the center line of the adjacent main wear track and the broken area of ​​the coating is connected to the adjacent main wear track, it means that the wearability of the coating is unqualified under the test conditions and the grade is 0.

[0039] In addition, if the coating peels off from the substrate during the test and the main wear track cannot be displayed, the abrasion resistance is also deemed unqualified, with a grade of 0. 2) Grade 0.5: After testing with simulated toothed grates, if the broken area of ​​the oil-gas sealing coating exceeds the center line of the adjacent main wear track, but the broken area of ​​the coating is not connected to the adjacent main wear track, it indicates that the wearability of the oil-gas sealing coating is qualified under the test conditions, and the grade is 0.5. 3) Grade 1: After testing with simulated toothed teeth, if the broken area of ​​the oil-gas sealing coating does not exceed the center line of the adjacent main wear track, it indicates that the oil-gas sealing coating has excellent wearability under the test conditions and is grade 1.

[0040] The abrasion resistance level of a certain oil-gas sealing coating under various test conditions is entered into a rating table to obtain the abrasion resistance level distribution of the coating under each test condition. This allows for the analysis of the applicable operating conditions range of a certain oil-gas sealing coating, providing technical guidance for the design clearance control of oil-gas sealing locations and the selection of coating materials.

[0041] Application examples: like Figure 6a , Figure 6b as well as Figure 6c As shown, the plasma-sprayed silver-copper oil-sealing coating after undergoing an abrasion test with a GH4169 simulated grating (the simulated grating sample is made of GH4169 high-temperature alloy material) is as follows: Figure 7 As shown, if the broken zone does not exceed the "middle line" of the adjacent main wear track after the test, the coating is judged to be qualified and excellent under the test conditions, with a grade of "1".

[0042] like Figure 8 As shown, after testing with the GH4169 simulated ferrule, the broken zone of the silver-copper oil-gas sealing coating exceeds the "middle line" of the adjacent main wear track, but the broken zone is not connected to the adjacent main wear track. Therefore, the wearability of the oil-gas sealing coating is deemed qualified under the test conditions, with a grade of "0.5".

[0043] like Figure 9 As shown, after testing with the GH4169 simulated tooth, the silver-copper oil-gas sealing coating has a broken zone that exceeds the "middle line" of the adjacent main wear track, and the broken zone is connected to the adjacent main wear track. Therefore, the oil-gas sealing coating is deemed to be unqualified in terms of wearability under the test conditions, with a grade of "0".

[0044] like Figure 10 As shown, the silver-copper oil-gas sealing coating peeled off directly from the substrate after being tested with the GH4169 simulated ferrule, and the wearability was deemed unqualified, with a grade of "0".

[0045] The table below shows the test and evaluation results of the abrasion performance of plasma-sprayed silver-copper coating and GH4169 simulated grating teeth. Before the test, considering the operating conditions of the parts, a linear velocity of 100 m / s was designed. At this velocity, four temperature points were set: room temperature, 200℃, 400℃, and 600℃, and four feed depths were set: 0.2 mm, 0.4 mm, 0.6 mm, and 0.8 mm. After experimental testing, the abrasion grades were entered into the grade evaluation table. The results show that the suitable operating range for the silver-copper oil-gas sealing coating is room temperature to 400℃, with an optimal feed depth of 0.2 mm. Therefore, in actual design, the gap between the grating teeth and the silver-copper oil-gas sealing coating should be sufficiently large to avoid abnormal abrasion between the coating and the grating teeth.

[0046] Table 4. Plasma-sprayed silver-copper oil-gas sealing coating under a linear velocity of 100 m / s. Abrasion grade evaluation table .

Claims

1. A method for evaluating the wearability of an oil-gas sealing coating used in conjunction with a toothed comb, characterized in that, Includes the following steps: Step S1: The simulated tooth sample is mounted on the outer edge of a high-speed rotating wheel, and the oil and gas sealing coating sample is mounted on a platform that can move forward and backward relative to the wheel. Step S2: Heat the simulated tooth sample and the oil-gas sealing coating sample to the set temperature, and control the wheel to rotate at the set wheel speed and run stably; Step S3: After the wheel reaches the set speed and runs stably, the platform drives the oil and gas sealing coating sample to move towards the wheel at the set feed rate. When the platform feeds to the set feed depth, the feed stops, allowing the tip of the grating tooth to penetrate into the coating, forming a high-speed collision between the simulated grating tooth sample and the oil and gas sealing coating sample. Step S4: Observe the surface condition of the oil-gas sealing coating after impact abrasion, determine the abrasion grade under each working condition based on the observation results, fill in the abrasion grade under each working condition into the grade evaluation table, and determine the applicable working condition range of the oil-gas sealing coating based on the summary results in the grade evaluation table.

2. The method for evaluating the wearability of an oil-gas sealing coating used in conjunction with a sieve according to claim 1, characterized in that: The rating table includes multiple working condition combinations and the wearability rating corresponding to each working condition combination. The operating condition combination includes at least three parameter dimensions: linear velocity, feed depth, and test temperature, with each parameter dimension having several levels.

3. The method for evaluating the wearability of an oil-gas sealing coating used in conjunction with a toothed grating, as described in claim 1, is characterized in that: Step S4, which involves determining the wearability grade under each working condition, includes the following steps: Step S4.1 Define the abrasion performance level, which is divided into several levels according to the quality of abrasion, and each level corresponds to a different degree of abrasion. Step S4.2: Conduct impact abrasion tests for each set of working conditions, and use the width comparison method to compare the abrasion morphology of the coating sample surface after impact abrasion with the preset standard comparison template. Step S4.3: Based on the comparison results of the width comparison method, determine the wearability level of the oil-gas sealing coating under the current working condition combination.

4. The method for evaluating the wearability of an oil-gas sealing coating used in conjunction with a toothed grating, as described in claim 3, is characterized in that: The preset standard comparison template includes the main wear track, the coating breakage zone, and the unweared zone; The main wear track corresponds to the location of the wear marks formed by the collision between the tip of the simulated comb and the oil-gas sealing coating; The coating breakage zone corresponds to the location of the breakage area formed by the collision and friction between the simulated comb tooth tip and the oil and gas sealing coating; The unworn area corresponds to the coating surface position that did not come into contact with the simulated tooth tip; The preset standard comparison template also has a center line between itself and the adjacent main wear track.

5. The method for evaluating the wearability of an oil-gas sealing coating used in conjunction with a toothed grating according to claim 1, characterized in that: The wearability grades include unqualified, qualified, and excellent grades; The non-compliance level is as follows: after abrasion, the broken area on the coating surface exceeds the center line of the adjacent main wear track and is connected to the adjacent main wear track; or the coating peels off and the main wear track cannot be displayed. The qualified level is: after impact abrasion, the broken area of ​​the coating surface exceeds the center line between adjacent main wear tracks but is not connected to the adjacent main wear tracks; The excellent grade is defined as follows: after impact abrasion, the broken area on the coating surface does not exceed the center line of the adjacent main wear track.

6. The method for evaluating the wearability of an oil-gas sealing coating used in conjunction with a toothed grating, as described in claim 1, is characterized in that: The simulated tooth sample is made of high-temperature alloy, and the top of the simulated tooth sample is provided with no less than 3 levels of teeth.

7. The method for evaluating the wearability of an oil-gas sealing coating used in conjunction with a toothed grating according to claim 1, characterized in that: The simulated toothed sample has a tooth end platform at its top.

8. The method for evaluating the wearability of an oil-gas sealing coating used in conjunction with a toothed grating according to claim 1, characterized in that: Each simulated tooth sample has chamfers on both sides.

9. The method for evaluating the wearability of an oil-gas sealing coating used in conjunction with a toothed grating according to claim 1, characterized in that: The oil and gas sealing coating sample is made of high-temperature alloy or titanium alloy, and the coating thickness is greater than 0.5 mm.

10. The method for evaluating the wearability of an oil-gas sealing coating used in conjunction with a toothed grating according to claim 1, characterized in that: The linear velocity of the tooth tip is calculated based on the set rotation speed of the wheel, and the linear velocity of the tooth tip is used as the working condition for this impact-grind test.

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