Device and method for testing erosion performance of thermal barrier coating

Abstract

The invention provides a device and a method for testing the erosion performance of a thermal barrier coating, relates to the technical field of thermal barrier coating testing, and aims to solve the problem of insufficient temperature and speed simulation of an existing gas spray gun type device. Comprising a workbench, a main air supply pipeline, a first branch and a second branch, an outlet of the first branch is connected to a particle feeding device, and an outlet of the particle feeding device is connected with a particle feeding pipe; the second branch is provided with a mass flow controller, an outlet of the second branch is connected to a gas heater, an outlet of the gas heater is provided with a nozzle with a downward spraying opening, the periphery of the nozzle is wrapped with an auxiliary heater, the side wall of the nozzle is communicated with an inclined material guide pipe, and an outlet of the particle feeding pipe is connected to the material guide opening; the workbench is located below the nozzle, used for bearing a sample and provided with a heating furnace used for heating the sample. The device can simulate the erosion test at high temperature and high speed.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal barrier coating testing, and in particular, to an erosion performance testing device and method for thermal barrier coatings. Background Art

[0002] The working temperatures of aero-engines and gas turbines tend to rise with the increase of the thrust-to-weight ratio. Setting thermal barrier coatings on the outer surfaces of corresponding components of aero-engines and gas turbines is currently the most practical way to increase their working temperatures. However, during the service of aero-engines and gas turbines, volcanic ash, sand and gravel in the environment, as well as high-melting-point particles with incomplete combustion in fuel, will cause erosion damage to the thermal barrier coatings, thus seriously affecting their working efficiency and service life. This requires testing the erosion performance of thermal barrier coatings. However, the method of directly conducting tests on actual machines not only has a long test cycle, but also consumes a large amount of material and human resources.

[0003] Existing erosion performance testing devices for thermal barrier coatings are mainly divided into three types: high-enthalpy wind tunnels, burner devices, and gas spray gun-type devices. Among them, high-enthalpy wind tunnels and burner devices have high costs and long test cycles. The maximum heating temperature of the gas spray gun-type device is limited, and the maximum speed of the solid particles that can be simulated is also limited, resulting in problems of insufficient simulation of both temperature and speed during the testing of the erosion performance of thermal barrier coatings. At the same time, due to nozzle wear and the influence of the test environment on particle speed, the particle ejection speed also changes during each test, resulting in a decrease in test accuracy. Summary of the Invention

[0004] The first object of the present invention is to provide an erosion performance testing device for thermal barrier coatings to solve the technical problem of insufficient simulation of both temperature and speed existing in existing gas spray gun-type devices.

[0005] The erosion performance testing device for thermal barrier coatings provided by the present invention includes a workbench, a main gas supply pipeline, and a first branch and a second branch connected in parallel at the end of the main gas supply pipeline. Among them, the main gas supply pipeline is used to provide a gas source; the outlet of the first branch is connected to a particle feeding device, and the outlet of the particle feeding device is connected to a particle feeding pipe; the second branch is provided with a mass flow controller, and the outlet of the second branch is connected to a gas heater. The outlet of the gas heater is provided with a nozzle with a downward jet, the nozzle extends in the up and down direction, an auxiliary heater is arranged on the outer periphery of the nozzle, an inclined material guiding pipe is communicated with the side wall of the nozzle, the material guiding port of the material guiding pipe is obliquely upward, and the outlet of the particle feeding pipe is connected to the material guiding port; the workbench is located below the nozzle, the workbench is used to carry a sample, and the workbench is provided with a heating furnace for heating the sample.

[0006] Further, the workbench is provided with a bracket, and the sample is fixedly arranged on the bracket, wherein the angle of the bracket around the horizontal axis is adjustable.

[0007] Further, the thermal barrier coating erosion performance testing device further includes a speed measuring device and a moving guide rail. The moving guide rail is fixedly installed on the workbench, and the speed measuring device, the bracket and the heating furnace are all slidably arranged on the moving guide rail. The moving guide rail is configured to position the speed measuring device below the nozzle or the sample below the nozzle; the speed measuring device is used to measure the ejection speed of the particles through the nozzle.

[0008] Further, the thermal barrier coating erosion performance testing device further includes a lifting table. The lifting table is slidably installed on the moving guide rail, and the speed measuring device, the bracket and the heating furnace are all installed at the lifting end of the lifting table.

[0009] Further, the speed measuring device includes an upper disk and a lower disk that are opposite and spaced apart in the up and down direction, and a driving motor. The housing of the driving motor is fixedly arranged on the lifting table, the motor shaft of the driving motor extends axially upward, and the upper disk and the lower disk are both fixedly sleeved on the motor shaft; the upper disk is provided with a speed measuring hole, the speed measuring hole is an eccentric hole, and the speed measuring hole penetrates the upper disk in the up and down direction.

[0010] Further, the nozzle includes a converging section, a throat and a diverging section arranged in sequence along the gas flow direction. The converging section is in an inverted conical shape, the large-diameter end of the converging section faces the gas heater, and the small-diameter end of the converging section is connected to the throat; the auxiliary heater is coated on the throat and the diverging section, and the feed pipe is connected to the diverging section; and / or, the outer periphery of the auxiliary heater is coated with heat-insulating cotton; and / or, the gas heater is equipped with a first thermocouple; and / or, the heating furnace is equipped with a second thermocouple; and / or, the thermal barrier coating erosion performance testing device further includes an infrared thermometer, and the infrared thermometer is used to measure the heating temperature of the auxiliary heater.

[0011] Further, the thermal barrier coating erosion performance testing device further includes a test chamber. The workbench is arranged inside the test chamber, and the nozzle extends into the test chamber.

[0012] Further, the main gas supply pipeline includes an air compressor, a gas storage tank, a ball valve, a pressure stabilizing valve, a filter and a first solenoid valve arranged in sequence along the gas flow direction; and / or, the first branch includes a second solenoid valve and a first proportional valve arranged in sequence along the gas flow direction; and / or, the second branch further includes a third solenoid valve and a second proportional valve, wherein the third solenoid valve, the second proportional valve and the mass flow controller are arranged in sequence along the gas flow direction.

[0013] The beneficial effects brought by the erosion performance test device for thermal barrier coatings of the present invention are as follows:

[0014] By providing an erosion performance test device for thermal barrier coatings mainly composed of a workbench, a main gas supply pipeline, a first branch and a second branch, when it is necessary to test the erosion performance of a sample, the sample can be placed below the nozzle. The main gas supply pipeline supplies gas to the first branch and the second branch respectively. Among them, the gas in the first branch will enter the particle feeding device to control the feeding pressure of the particle feeding device, so that the particles can enter the nozzle through the guide pipe at a certain pressure to ensure the feeding speed of the particles. At the same time, after the gas in the second branch is adjusted in mass flow by the mass flow controller, it enters the gas heater, and is heated by the gas heater to form high-temperature gas with a certain pressure. Then, this part of the gas enters the nozzle.

[0015] After the above process, the particles that originally have a certain injection pressure enter the nozzle through the diversion pipe. As the gas with a certain pressure obtained by being heated by the gas heater flows in the nozzle, it will re-pressurize the particles flowing out of the guide pipe, so that the above particles can be sprayed onto the sample at a higher speed. Moreover, the particles entering the nozzle through the diversion pipe can not only be heated by the auxiliary heater wrapped around the outer periphery of the nozzle, but also be reheated by the high-temperature gas obtained by being heated by the gas heater, so that the ejected particles have a higher temperature. At the same time, by setting a heating furnace on the workbench, the heating of the sample can also be realized.

[0016] It can be seen that this erosion performance test device for thermal barrier coatings uses the heat superposition of the gas heater and the auxiliary heater to make the ejected particles have a higher temperature. And it also uses the heating furnace to heat the sample, so that the sample can realize the simulation test at a higher temperature. At the same time, the gas heated by the gas heater can also be superposed with the original injection pressure of the particles, so that the ejected particles have a higher speed, thus effectively solving the problem of insufficient temperature and speed simulation existing in the existing gas spray gun type devices.

[0017] In addition, in this erosion performance test device for thermal barrier coatings, by making the nozzle orifice face downward, the ejection direction of the particles is also made consistent with the direction of their gravity, thus avoiding the interference of gravity on the air flow and particles during the test process due to the inconsistent ejection direction and gravity direction.

[0018] The second object of the present invention is to provide a method for testing the erosion performance of thermal barrier coatings to solve the technical problems of insufficient temperature and speed simulation existing in the existing gas spray gun type devices.

[0019] The erosion performance test method for thermal barrier coatings provided by the present invention uses the above-mentioned erosion performance test device for thermal barrier coatings to test the erosion performance of the thermal barrier coatings on the sample, and includes the following steps:

[0020] The main gas supply pipeline supplies gas to the first branch and the second branch;

[0021] Use the speed measuring device to measure the ejection speed of the particles through the nozzle;

[0022] Adjust the pressure of the second branch to 0.2 - 0.5 MPa, adjust the gas flow rate of the mass flow controller to 130 - 350 L / min, adjust the heating temperature of the gas heater to the target temperature, and turn on the auxiliary heater and the gas heater. Among them, the target temperature is between 25 - 900 °C, and the heating temperature of the auxiliary heater is between 0 - 1200 °C;

[0023] Adjust the pressure of the first branch to 0.1 - 0.2 MPa, adjust the feeding rate of the particle feeding device to 1 - 10 g / min, and turn on the particle feeding device;

[0024] Adjust the sample erosion angle to the target angle, adjust the sample erosion distance to the target erosion distance, and heat the sample to the set temperature using the heating furnace. Among them, the target angle is between 10 - 90 °C, the target erosion distance is between 10 - 100 mm, and the set temperature is between 25 - 1200 °C;

[0025] Conduct the test within the set time range.

[0026] Furthermore, the step of using the speed measuring device to measure the ejection speed of the particles through the nozzle includes:

[0027] Move the speed measuring device to the position where the speed measuring hole on the upper disc is opposite to the nozzle, so that the particles ejected from the nozzle pass through the speed measuring hole and are ejected onto the lower disc, leaving a first mark on the lower disc, and stop the ejection;

[0028] The driving motor drives the upper disc and the lower disc to rotate coaxially, so that the particles ejected from the nozzle pass through the speed measuring hole again and are ejected onto the lower disc, leaving a second mark on the lower disc;

[0029] Calculate the particle speed. Among them, the calculation formula for the particle speed is: V = 2πRnL / S, where V represents the particle speed; R represents the radius of the lower disc; n represents the rotation speed of the lower disc; L represents the distance between the upper disc and the lower disc; S represents the arc length between the first mark and the second mark.

[0030] The beneficial effects brought by the erosion performance test method for thermal barrier coatings of the present invention are:

[0031] The erosion performance test method of the thermal barrier coating can achieve temperature simulation from 0 to 1200 °C and particle velocity simulation of 300 m / s. The erosion test can be carried out under temperature and velocity conditions extremely close to the actual use environment, and the erosion test can be carried out at different temperatures and different velocities, improving the multiplicity of test parameters, which is conducive to exploring the failure modes of the thermal barrier coating under different working conditions and providing good guidance for improving the erosion resistance and extending the service life of the thermal barrier coating.

[0032] In addition, in this test method, the ejection velocity of the particles is measured before the erosion test, and then the sample is subjected to the erosion test, improving the test accuracy. Description of the Drawings

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0034] Figure 1 It is a schematic structural diagram of the erosion performance test device for the thermal barrier coating provided by the embodiment of the present invention;

[0035] Figure 2 It is a schematic structural diagram of the nozzle of the erosion performance test device for the thermal barrier coating provided by the embodiment of the present invention;

[0036] Figure 3 It is a schematic structural diagram of the velocity measuring device of the erosion performance test device for the thermal barrier coating provided by the embodiment of the present invention.

[0037] Description of the reference numerals:

[0038] 1 - Air compressor; 2 - Gas storage tank; 3 - Ball valve; 4 - Pressure stabilizing valve; 5 - Filter; 6 - First solenoid valve; 7 - Second solenoid valve; 8 - First proportional valve; 9 - Particle feeding device; 10 - Particle feeding pipe; 11 - Nozzle; 12 - Third solenoid valve; 13 - Second proportional valve; 14 - Mass flow controller; 15 - Gas heater; 16 - Auxiliary heater; 17 - Particles; 18 - Infrared thermometer; 19 - Lifting platform; 20 - Sample; 21 - Heating furnace; 22 - Second thermocouple; 23 - Starter; 24 - First thermocouple; 25 - Control cabinet; 26 - Test chamber; 27 - Collector; 28 - Heat insulation cotton; 29 - Velocity measuring device; 30 - Moving guide rail; 31 - Feeding pipe;

[0039] 111 - Converging section; 112 - Throat; 113 - Diverging section;

[0040] 291 - Driving motor; 292 - Lower disk; 293 - Upper disk; 294 - Speedometer hole. Specific embodiments

[0041] To make the above - mentioned objects, features, and advantages of the present invention more obvious and understandable, the following will describe in detail the specific embodiments of the present invention with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0042] Figure 1 It is a schematic structural diagram of the thermal barrier coating erosion performance test device provided for this embodiment. As Figure 1 shown, this embodiment provides a thermal barrier coating erosion performance test device, including a workbench, a main gas supply pipeline, and a first branch and a second branch connected in parallel at the end of the main gas supply pipeline. Among them, the main gas supply pipeline is used to provide a gas source; the outlet of the first branch is connected to the particle feeding device 9, and the outlet of the particle feeding device 9 is connected to the particle feeding pipe 10; the second branch is provided with a mass flow controller 14, and the outlet of the second branch is connected to the gas heater 15. The outlet of the gas heater 15 is provided with a nozzle 11 with a downward - facing nozzle. The nozzle 11 extends in the up - down direction. The outer periphery of the nozzle 11 is covered with an auxiliary heater 16. The side wall of the nozzle 11 is communicated with an inclined material guiding pipe 31. The material guiding port of the material guiding pipe 31 is obliquely upward. The outlet of the particle feeding pipe 10 is connected to the material guiding port; the workbench is located below the nozzle 11. The workbench is used to carry the sample 20, and the workbench is provided with a heating furnace 21 for heating the sample 20.

[0043] When it is necessary to test the erosion performance of the sample 20, the sample 20 can be placed below the nozzle 11. The main gas supply pipeline is used to supply gas to the first branch and the second branch respectively. Among them, the gas in the first branch will enter the particle feeding device 9 to control the feeding pressure of the particle feeding device 9, so that the particles 17 can enter the nozzle 11 through the material guiding pipe 31 at a certain pressure to ensure the feeding speed of the particles 17; at the same time, the gas in the second branch enters the gas heater 15 after the mass flow is adjusted by the mass flow controller 14, and is heated by the gas heater 15 to form a high - temperature gas with a certain pressure. Then, this part of the gas enters the nozzle 11.

[0044] After the above process, the particles 17 that originally had a certain injection pressure enter the nozzle 11 through the diversion pipe. As the gas with a certain pressure obtained by being heated by the gas heater 15 flows in the nozzle 11, it will form a re-pressurization of the particles 17 flowing out of the material guiding pipe 31, so that the above-mentioned particles 17 can be injected into the sample 20 at a higher speed. Moreover, the particles 17 entering the nozzle 11 through the diversion pipe can not only be heated by the auxiliary heater 16 wrapped around the outer periphery of the nozzle 11, but also be reheated by the high-temperature gas obtained by being heated by the gas heater 15, so that the ejected particles 17 have a higher temperature. At the same time, by setting a heating furnace 21 on the workbench, the heating of the sample 20 can also be realized.

[0045] It can be seen that this thermal barrier coating erosion performance test device utilizes the heat superposition of the gas heater 15 and the auxiliary heater 16 to make the ejected particles 17 have a higher temperature. Moreover, it also uses the heating furnace 21 to heat the sample 20, so that the sample 20 can realize a simulation test at a higher temperature. At the same time, the gas heated by the gas heater 15 can also be superposed with the original injection pressure of the particles 17, so that the ejected particles 17 have a higher speed, thus effectively solving the problem of insufficient temperature and speed simulation existing in the existing gas spray gun type devices.

[0046] In addition, in this thermal barrier coating erosion performance test device, by making the nozzle of the nozzle 11 face downward, the injection direction of the particles 17 is also made consistent with the direction of their gravity, thus avoiding the interference of gravity on the air flow and the particles 17 during the test due to the inconsistent injection direction and the gravity direction.

[0047] It should be noted that in this embodiment, the pressure of the gas heater 15 can be set to be 0.1 MPa greater than the pressure of the particle feeding device 9. This setting can prevent the gas from being sucked back into the gas heater 15, thus ensuring the safety of the test process.

[0048] Please continue to refer to Figure 1 , in this embodiment, the workbench is provided with a bracket, and the sample 20 is fixedly arranged on the bracket, wherein the angle of the bracket around the horizontal axis is adjustable.

[0049] The above-mentioned setting of the bracket can realize the adjustment of the angle of the sample 20, so as to simulate the influence of different erosion angles on the service life of the thermal barrier coating.

[0050] Among them, the adjustment angle of the bracket for the sample 20 is between 10 and 90 °C. The specific structure of the bracket can refer to the prior art, and this embodiment does not make any improvements to it, so it will not be described in detail.

[0051] Please continue to refer to Figure 1, in this embodiment, the thermal barrier coating erosion performance testing device may further include a speed measuring device 29 and a moving guide rail 30. Among them, the moving guide rail 30 is fixedly installed on the workbench, and the speed measuring device 29, the bracket and the heating furnace 21 are all slidably arranged on the moving guide rail 30. The moving guide rail 30 is configured to place the speed measuring device 29 below the nozzle 11 or place the sample 20 below the nozzle 11; the speed measuring device 29 is used to measure the ejection speed of the particles 17 through the nozzle 11.

[0052] When it is necessary to measure the ejection speed of the nozzle 11, the speed measuring device 29 can be slid to below the nozzle 11 to measure the ejection speed of the particles 17 through the nozzle 11; after the measurement of the above ejection speed is completed, the speed measuring device 29 can be moved away, and the bracket fixed with the product can be moved to below the nozzle 11 to simulate the erosion at the ejection speed.

[0053] The setting of the speed measuring device 29 enables the ejection speed of the particles 17 to be measured before the erosion test, and then the sample 20 to be subjected to the erosion test, improving the test accuracy.

[0054] Please continue to refer to Figure 1 , in this embodiment, the thermal barrier coating erosion performance testing device may further include a lifting platform 19. Specifically, the lifting platform 19 is slidably installed on the moving guide rail 30, and the speed measuring device 29, the bracket and the heating furnace 21 are all installed at the lifting end of the lifting platform 19.

[0055] The setting of the above-mentioned lifting platform 19 enables the speed measuring device 29 and the sample 20 to be raised and lowered according to the required erosion distance during the erosion test of the thermal barrier coating, so as to realize the erosion test at the required height position.

[0056] Figure 2 It is a schematic structural diagram of the nozzle 11 of the thermal barrier coating erosion performance testing device provided in this embodiment. Please continue to refer to Figure 1 , and in combination with Figure 2 , in this embodiment, the nozzle 11 may include a converging section 111, a throat 112 and a diverging section 113 arranged in sequence along the gas flow direction. Among them, the converging section 111 is in an inverted conical shape, the large diameter end of the converging section 111 faces the gas heater 15, and the small diameter end of the converging section 111 is connected to the throat 112; the auxiliary heater 16 is coated on the throat 112 and the diverging section 113, and the feed pipe 31 is connected to the diverging section 113.

[0057] The above-mentioned nozzle 11 is arranged such that the gas flowing out of the gas heater 15 reaches a high-speed state after passing through the converging section 111 and the throat 112. At the same time, the particles 17 sent out by the particle feeding device 9 enter the diverging section 113 through the guide pipe 31, so that the high-temperature and high-speed gas flowing out of the throat 112 can carry the above-mentioned particles 17 and pass through the diverging section 113 at a high speed and be sprayed onto the surface of the sample 20.

[0058] It can be seen that this arrangement form of the nozzle 11 can realize the re-acceleration of the particles 17 sent out by the particle feeding device 9, thereby further increasing the spraying speed of the particles 17.

[0059] Please continue to refer to Figure 1 , in this embodiment, the outer periphery of the auxiliary heater 16 is coated with heat insulation cotton 28.

[0060] This arrangement can reduce the heat dissipation of the auxiliary heater 16 to the outside, so that the heat of the auxiliary heater 16 can be concentrated at the position of the nozzle 11 as much as possible, which is beneficial to improving the heating efficiency of the nozzle 11.

[0061] Figure 3 It is a schematic structural diagram of the speed measuring device 29 of the thermal barrier coating erosion performance testing device provided in this embodiment. As Figure 3 shown, in this embodiment, the speed measuring device 29 may include an upper disk 293 and a lower disk 292 that are opposite and spaced apart in the up-down direction, and a driving motor 291. Among them, the housing of the driving motor 291 is fixedly arranged on the lifting table 19, the motor shaft of the driving motor 291 extends axially upward, and both the upper disk 293 and the lower disk 292 are fixedly sleeved on the motor shaft; the upper disk 293 is provided with a speed measuring hole 294, the speed measuring hole 294 is an eccentric hole, and the speed measuring hole 294 penetrates through the upper disk 293 in the up-down direction.

[0062] When it is necessary to measure the ejection speed of the nozzle 11, the speed measuring device 29 can be first moved to a position where the speed measuring hole 294 of its upper disk 293 is directly opposite to the nozzle 11, so that the particles 17 ejected by the nozzle 11 pass through the speed measuring hole 294 and are sprayed onto the lower disk 292, leaving a first mark on the lower disk 292, and then stop spraying; afterwards, the driving motor 291 drives the upper disk 293 and the lower disk 292 to rotate coaxially, so that the particles 17 ejected by the nozzle 11 pass through the speed measuring hole 294 again and are sprayed onto the lower disk 292, leaving a second mark on the lower disk 292; then, the ejection speed of the nozzle 11 can be measured by using the formula V = 2πRnL / S, where V represents the particle speed; R represents the radius of the lower disk 292; n represents the rotation speed of the lower disk 292; L represents the distance between the upper disk 293 and the lower disk 292; S represents the arc length between the first mark and the second mark.

[0063] This double-disk speed measuring device 29 not only has a simple structure, but also has a simple speed measuring process, which is beneficial to improving the test efficiency of the erosion performance of thermal barrier coatings.

[0064] Please continue to refer to Figure 1 , in this embodiment, a first thermocouple 24 is installed on the gas heater 15.

[0065] The setting of the above-mentioned first thermocouple 24 can realize the real-time detection of the gas flowing out of the gas heater 15, so as to facilitate the timely regulation of the heating temperature of the gas heater 15.

[0066] Please continue to refer to Figure 1 , in this embodiment, a second thermocouple 22 is installed on the heating furnace 21.

[0067] The setting of the above-mentioned second thermocouple 22 can realize the real-time detection of the heating temperature of the heating furnace 21, so as to facilitate the timely regulation of the heating temperature of the heating furnace 21.

[0068] Please continue to refer to Figure 1 , in this embodiment, the thermal barrier coating erosion performance test device may further include an infrared thermometer 18, wherein the infrared thermometer 18 is used to measure the heating temperature of the auxiliary heater 16.

[0069] The setting of the above-mentioned infrared thermometer 18 can realize the real-time detection of the heating temperature of the auxiliary heater 16, so that the tester can regulate the heating temperature of the auxiliary heater 16 according to the test requirements.

[0070] Please continue to refer to Figure 1 , in this embodiment, the thermal barrier coating erosion performance test device may further include a test chamber 26, wherein the workbench is arranged inside the test chamber 26, and the nozzle 11 extends into the test chamber 26.

[0071] By setting the test chamber 26, the test process of the sample 20 can be carried out in a relatively enclosed space. On the one hand, it can reduce the interference of the external environment on the test process. On the other hand, it can also avoid damage to the surrounding components and personnel caused by the ejection of the particles 17 and high-temperature gas.

[0072] In this embodiment, the infrared thermometer 18 is located inside the test chamber 26 and is installed on the side wall of the test chamber 26.

[0073] Please continue to refer to Figure 1 , in this embodiment, a control cabinet 25 is installed outside the test chamber 26. By using the control cabinet 25, it is convenient to centrally control the corresponding components in the thermal barrier coating erosion performance test device.

[0074] Please continue to refer to Figure 1, in this embodiment, the heating furnace 21 is connected to a start-stop controller 23, and the start-stop controller 23 is electrically connected to the control cabinet 25.

[0075] Please continue to refer to Figure 1 , in this embodiment, a collector 27 is provided inside the test chamber 26. Among them, the collector 27 is located below the workbench, and a particle collection port is provided at the top of the collector 27.

[0076] The above-mentioned setting of the collector 27 can effectively collect the particles 17 after the erosion test, thereby avoiding the pollution of the surrounding environment by the particles 17.

[0077] Please continue to refer to Figure 1 , in this embodiment, the main air supply pipeline includes an air compressor 1, an air storage tank 2, a ball valve 3, a pressure stabilizing valve 4, a filter 5, and a first solenoid valve 6 arranged in sequence along the air flow direction.

[0078] The main air supply pipeline uses the air compressor 1 to provide air source. When the compressed air source provided by the air compressor 1 enters the air storage tank 2, a stable air flow can be formed; when the above air flow passes through the pressure stabilizing valve 4, the air pressure can be kept stable; subsequently, the above gas passes through the filter 5 for filtration and drying, so that the gas finally entering the first branch and the second branch is clean gas. Among them, the first solenoid valve 6 can be used to control the on-off of the main air supply pipeline.

[0079] Please continue to refer to Figure 1 , in this embodiment, the first branch includes a second solenoid valve 7 and a first proportional valve 8 arranged in sequence along the air flow direction.

[0080] By setting the second solenoid valve 7 in the first branch, the on-off control of the first branch can be realized; by setting the first proportional valve 8 in the first branch, the feed pressure of the particle feeding device 9 can be adjusted.

[0081] Please continue to refer to Figure 1 , in this embodiment, the second branch further includes a third solenoid valve 12 and a second proportional valve 13. Among them, the third solenoid valve 12, the second proportional valve 13, and the mass flow controller 14 are arranged in sequence along the air flow direction.

[0082] By setting the third solenoid valve 12 in the second branch, the on-off control of the second branch can be realized; by setting the second proportional valve 13 in the second branch, the gas pressure entering the gas heater 15 can be adjusted.

[0083] The working principle of the erosion performance test device for the thermal barrier coating is as follows: The air compressor 1 provides the air source, a stable air flow is formed in the air storage tank 2, the air flow pressure is kept stable by the pressure stabilizing valve 4, and then the above gas is filtered and dried by the filter 5; The gas that has completed filtration and drying is divided into two paths and enters the first branch and the second branch respectively. Among them, the first branch controls the feeding pressure of the particle feeding device 9 through the first proportional valve 8, and the second branch controls the gas pressure and flow rate entering the gas heater 15 through the second proportional valve 13 and the mass flow controller 14; The temperature of the gas when it enters the nozzle 11 is controlled by the first thermocouple 24, the temperature of the auxiliary heater 16 is controlled by the infrared thermometer 18, and the auxiliary heater 16 is used to further heat the eroding gas and particles 17, so that the hot gas flow carrying the particles 17 impacts the surface of the sample 20 heated by the heating furnace 21 after accelerating through the nozzle 11, completing the test process.

[0084] Among them, before the erosion test of the sample 20, the ejection speed of the nozzle 11 is measured by the speed measuring device 29.

[0085] In addition, this embodiment also provides a method for testing the erosion performance of the thermal barrier coating, which uses the above-mentioned erosion performance test device for the thermal barrier coating to test the erosion performance of the thermal barrier coating of the sample 20, including the following steps: The main air supply pipeline supplies air to the first branch and the second branch; The ejection speed of the particles 17 passing through the nozzle 11 is measured by the speed measuring device 29; Adjust the pressure of the second branch to 0.2 - 0.5 MPa, adjust the gas flow rate of the mass flow controller 14 to 130 - 350 L / min, adjust the heating temperature of the gas heater 15 to the target temperature, and turn on the auxiliary heater 16 and the gas heater 15. Among them, the target temperature is between 25 - 900 °C, and the heating temperature of the auxiliary heater 16 is between 0 - 1200 °C; Adjust the pressure of the first branch to 0.1 - 0.2 MPa, adjust the feeding rate of the particle feeding device 9 to 1 - 10 g / min, and turn on the particle feeding device 9; Adjust the erosion angle of the sample 20 to the target angle, adjust the erosion distance of the sample 20 to the target erosion distance, and heat the sample 20 to the set temperature by the heating furnace 21. Among them, the target angle is between 10 - 90 °C, the target erosion distance is between 10 - 100 mm, and the set temperature is between 25 - 1200 °C; Conduct the test within the set time range.

[0086] This method for testing the erosion performance of the thermal barrier coating can achieve temperature simulation from 0 to 1200 °C and particle speed simulation of 300 m / s. The erosion test can be carried out under temperature and speed conditions extremely close to the actual use environment, and can conduct erosion tests at different temperatures and different speeds, improving the diversity of test parameters, which is conducive to exploring the failure modes of the thermal barrier coating under different working conditions and provides a good guiding role for improving the erosion resistance and extending the service life of the thermal barrier coating.

[0087] In addition, in this test method, the ejection speed of the particles 17 is measured before the erosion test, and then the sample 20 is subjected to the erosion test, which improves the test accuracy.

[0088] In the following text, the steps of the test method for the erosion performance of the thermal barrier coating will be described with a specific embodiment.

[0089] Step 1: Open the ball valve 3, adjust the pressure stabilizing valve 4, set the compressed gas pressure at 0.7 - 0.8 MPa to keep the gas pressure in the main supply pipeline stable, open the first solenoid valve 6, and let the above gas flow into the first branch and the second branch;

[0090] Step 2: Open the second solenoid valve 7, the first proportional valve 8, and the particle feeding device 9 to control the gas pressure and flow rate in the first branch; open the third solenoid valve 12, the second proportional valve 13, and the mass flow controller 14 to control the gas pressure and flow rate in the second branch; move the speed measuring device 29 to a position where the speed measuring hole 294 on the upper disk 293 is directly opposite to the nozzle 11, open the particle feeding device 9, so that the erosion particles 17 pass through the speed measuring hole 294 to leave a first mark on the lower disk 292, and stop the spraying; then, start the driving motor 291 to drive the upper disk 293 and the lower disk 292 to rotate coaxially, and continue the erosion to leave a second mark on the lower disk 292, and calculate the particle speed. The formula for the particle speed is: V = 2πRnL / S, where V represents the particle speed; R represents the radius of the lower disk 292; n represents the rotation speed of the lower disk 292; L represents the distance between the upper disk 293 and the lower disk 292; S represents the arc length between the first mark and the second mark; among them, the rotation speed of the lower disk 292 is also the rotation speed of the driving motor 291;

[0091] Step 3: Open the second solenoid valve 7, adjust the first proportional valve 8 according to the target particle feeding pressure and feeding rate, so that the pressure in the first branch is 0.1 - 0.2 MPa; adjust the feeding rate of the particle feeding device 9 to 1 - 10 g / min, and open the particle feeding device 9;

[0092] Step 4: Open the third solenoid valve 12, adjust the second proportional valve 13 and the mass flow controller 14 according to the target speed requirement, control the gas pressure at 0.2 - 0.5 MPa, and the gas flow rate at 130 - 350 L / min; adjust the heating temperature of the gas heater 15 to the target temperature, and open the auxiliary heater 16 and the gas heater 15. Among them, the temperature of the gas heater 15 is 25 - 900 °C, and the heating temperature of the auxiliary heater 16 is 0 - 1200 °C;

[0093] Step 5: Adjust the erosion angle of the sample 20 to the target angle, adjust the erosion distance of the sample 20 to the target erosion distance, and heat the sample 20 to the set temperature using the heating furnace 21, where the target angle is between 10 and 90 °C, the target erosion distance is between 10 and 100 mm, and the set temperature is between 25 and 1200 °C;

[0094] Step 6: Set the test time. After the gas temperature, the temperature of the nozzle 11, and the temperature of the sample 20 reach the target set conditions, start the test; after the test time is up, the test is completed;

[0095] Step 7: Turn off the particle feeding device 9, the gas heater 15, and the heating furnace 21, cool to room temperature, and the test ends.

[0096] In summary, the present invention heats the sample 20 through the high-temperature gas heater 15, the auxiliary heater 16, and the heating furnace 21, and can achieve temperature simulation from 0 to 1200 °C. The three-stage nozzle 11 structure can achieve particle velocity simulation of 300 m / s. The erosion experiment can be carried out under temperature and velocity conditions extremely close to the actual use environment. The device has a compact structure, is easy to operate, convenient to maintain, and relatively low in cost, facilitating researchers to study the erosion resistance of the coating under actual working conditions and ensuring the safety of test personnel and equipment.

[0097] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be subject to the scope defined by the claims.

[0098] Finally, it should also be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article, or device. Without further limitation, an element defined by the statement "comprising a..." does not exclude the existence of additional identical elements in the process, method, article, or device comprising the element.

[0099] In the above embodiments, descriptions of orientations such as "upper", "lower", "side", etc. are all based on the drawings shown.

[0100] The foregoing description of the disclosed embodiments enables those skilled in the art to practice or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A thermal barrier coating erosion performance testing device, characterized in that, It includes a workbench, a main air supply pipeline, and a first branch and a second branch which are arranged in parallel at the end of the main air supply pipeline. Among them, the main air supply pipeline is used to provide a gas source; the outlet of the first branch is connected to a particle feeding device (9), and the outlet of the particle feeding device (9) is connected to a particle feed pipe (10); the second branch is provided with a mass flow controller (14), and the outlet of the second branch is connected to a gas heater (15). The outlet of the gas heater (15) is provided with a nozzle (11) with a downward spout. The nozzle (11) extends in the vertical direction. An auxiliary heater (16) is wrapped around the outer periphery of the nozzle (11). An inclined material guide pipe (31) is communicated with the side wall of the nozzle (11). The material guide port of the material guide pipe (31) is obliquely upward, and the outlet of the particle feed pipe (10) is connected to the material guide port; the workbench is located below the nozzle (11), and the workbench is used to carry a sample (20), and the workbench is provided with a heating furnace (21) for heating the sample (20).

2. The erosion performance test device for thermal barrier coatings according to claim 1, wherein The workbench is provided with a bracket, and the sample (20) is fixedly arranged on the bracket. Among them, the angle of the bracket around the horizontal axis is adjustable.

3. The erosion performance testing device for thermal barrier coatings according to claim 2, characterized in that The thermal barrier coating erosion performance test device further includes a speed measuring device (29) and a moving guide rail (30). The moving guide rail (30) is fixedly installed on the workbench. The speed measuring device (29), the bracket and the heating furnace (21) are all slidably arranged on the moving guide rail (30). The moving guide rail (30) is configured to make the speed measuring device (29) located below the nozzle (11) or make the sample (20) located below the nozzle (11); the speed measuring device (29) is used to measure the ejection speed of the particles (17) through the nozzle (11).

4. The erosion performance testing device for thermal barrier coatings according to claim 3, characterized in that, The thermal barrier coating erosion performance test device further includes a lifting platform (19). The lifting platform (19) is slidably installed on the moving guide rail (30). The speed measuring device (29), the bracket and the heating furnace (21) are all installed at the lifting end of the lifting platform (19).

5. The erosion performance testing device for thermal barrier coatings according to claim 4, characterized in that, The speed measuring device (29) includes an upper disk (293) and a lower disk (292) which are opposite and spaced apart in the vertical direction, and a driving motor (291). The housing of the driving motor (291) is fixedly arranged on the lifting platform (19). The motor shaft of the driving motor (291) extends axially upward. The upper disk (293) and the lower disk (292) are both fixedly sleeved on the motor shaft; the upper disk (293) is provided with a speed measuring hole (294). The speed measuring hole (294) is an eccentric hole, and the speed measuring hole (294) penetrates through the upper disk (293) in the vertical direction.

6. The erosion performance test device for thermal barrier coatings according to claim 1, characterized in that, The nozzle (11) includes a converging section (111), a throat (112), and a diverging section (113) arranged in sequence along the gas flow direction. The converging section (111) is in an inverted conical shape, with the large-diameter end of the converging section (111) facing the gas heater (15), and the small-diameter end of the converging section (111) is connected to the throat (112); the auxiliary heater (16) is wrapped around the throat (112) and the diverging section (113), and the feed pipe (31) is connected to the diverging section (113); and / or, the outer periphery of the auxiliary heater (16) is wrapped with heat insulation cotton (28); and / or, the gas heater (15) is equipped with a first thermocouple (24); and / or, the heating furnace (21) is equipped with a second thermocouple (22); and / or, the thermal barrier coating erosion performance testing device further includes an infrared thermometer (18), and the infrared thermometer (18) is used to measure the heating temperature of the auxiliary heater (16).

7. The erosion performance test device for thermal barrier coatings according to claim 1, wherein The thermal barrier coating erosion performance testing device further includes a test chamber (26). The workbench is arranged inside the test chamber (26), and the nozzle (11) extends into the test chamber (26).

8. The erosion performance testing device for thermal barrier coatings according to any one of claims 1-7, characterized in that, The main gas supply pipeline includes an air compressor (1), a gas storage tank (2), a ball valve (3), a pressure stabilizing valve (4), a filter (5), and a first solenoid valve (6) arranged in sequence along the gas flow direction; and / or, the first branch includes a second solenoid valve (7) and a first proportional valve (8) arranged in sequence along the gas flow direction; and / or, the second branch further includes a third solenoid valve (12) and a second proportional valve (13), wherein the third solenoid valve (12), the second proportional valve (13), and the mass flow controller (14) are arranged in sequence along the gas flow direction.

9. A method for testing the erosion performance of a thermal barrier coating, characterized in that, Using the thermal barrier coating erosion performance testing device according to any one of claims 1-8 to conduct an erosion performance test on the thermal barrier coating of the sample (20), including the following steps: The main gas supply pipeline supplies gas to the first branch and the second branch. Using a speed measuring device (29) to measure the ejection speed of the particles (17) through the nozzle (11). Adjust the pressure of the second branch to 0.2-0.5 MPa, adjust the gas flow rate of the mass flow controller (14) to 130-350 L / min, adjust the heating temperature of the gas heater (15) to the target temperature, and turn on the auxiliary heater (16) and the gas heater (15), wherein the target temperature is between 25-900 °C, and the heating temperature of the auxiliary heater (16) is between 0-1200 °C. Adjust the pressure of the first branch to 0.1-0.2 MPa, adjust the feeding rate of the particle feeding device (9) to 1-10 g / min, and turn on the particle feeding device (9). Adjust the erosion angle of the sample (20) to the target angle, adjust the erosion distance of the sample (20) to the target erosion distance, and use the heating furnace (21) to heat the sample (20) to the set temperature, wherein the target angle is between 10-90 °C, the target erosion distance is between 10-100 mm, and the set temperature is between 25-1200 °C. Conduct the test within the set time range.

10. The erosion performance test method of the thermal barrier coating according to claim 9, wherein The step of measuring the ejection speed of the particles (17) through the nozzle (11) by using the speed measuring device (29) includes: Moving the speed measuring device (29) to a position where the speed measuring hole (294) of the upper disk (293) is opposite to the nozzle (11), so that the particles (17) ejected from the nozzle (11) pass through the speed measuring hole (294) and are ejected onto the lower disk (292), leaving a first mark on the lower disk (292), and stopping the ejection; driving the motor (291) to drive the upper disk (293) and the lower disk (292) to rotate coaxially, so that the particles (17) ejected from the nozzle (11) pass through the speed measuring hole (294) again and are ejected onto the lower disk (292), leaving a second mark on the lower disk (292); Calculating the speed of the particles (17), where the calculation formula for the particle speed is: V = 2πRnL / S, V represents the particle speed; R represents the radius of the lower disk (292); n represents the rotation speed of the lower disk (292); L represents the distance between the upper disk (293) and the lower disk (292); S represents the arc length between the first mark and the second mark.

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