Device for examining thermal shock performance of thermal barrier coating

Abstract

The utility model belongs to the technical field of thermal barrier coatings, and particularly relates to a device for examining the thermal shock performance of a thermal barrier coating. The device comprises a sample rotary table with a vertically arranged rotary surface, a plurality of sample placing grooves are formed in one side of the sample rotary table, and the plurality of sample placing grooves are uniformly distributed in the circumferential direction of the rotary surface of the sample rotary table; the sample placing groove at the highest position of the sample rotary table is correspondingly provided with an oxyhydrogen flame spray gun for heating a sample and a laser infrared thermometer for monitoring the temperature of the sample, the laser infrared thermometer is connected with a temperature recorder, and the sample rotary table, the oxyhydrogen flame spray gun and the laser infrared thermometer are all arranged on a substrate; the problem that the working condition at the temperature of more than 1050 DEG C cannot be examined due to limited temperature resistance of a substrate high-temperature alloy in the whole heating of a traditional high-temperature furnace is solved, the defects that traditional flame gradient heating is flammable and explosive, large in potential safety hazard and high in cost are overcome, and the thermal shock performance examination requirement of the thermal barrier coating resistant to the temperature of more than 1050 DEG C can be met.

Description

Technical Field

[0001] This utility model belongs to the field of thermal barrier coating technology, specifically relating to a device for evaluating the thermal shock performance of thermal barrier coatings. Background Technology

[0002] Thermal barrier coating technology has been widely used in the protection of hot-end components of gas turbines and aero engines. It has been successfully applied to the thermal protection of hot-end components such as combustion chambers, blades, and exhaust nozzles. With the continuous increase in engine inlet temperatures, the demand for novel thermal barrier coatings resistant to temperatures above 1200℃ is becoming increasingly urgent. Thermal shock performance testing of novel thermal barrier coatings resistant to temperatures above 1200℃ is one of the main methods for simulating the service life of coatings, and typically employs two methods: overall heating in a high-temperature furnace and gradient flame heating.

[0003] However, the overall heating of a high-temperature furnace has limitations because the temperature resistance of the base high-temperature alloy is limited, making it impossible to conduct tests for temperatures above 1050℃. Furthermore, flame gradient heating tests often use kerosene, oxygen, and acetylene, among which oxygen and acetylene are flammable and explosive gases, posing safety hazards if stored in a concentrated manner, and their continuous use is also costly.

[0004] Therefore, there is an urgent need for a new device for testing the thermal shock performance of thermal barrier coatings, in order to solve the problems faced in testing the thermal shock performance of thermal barrier coatings with a temperature resistance of over 1050℃.

[0005] In view of the above, this utility model is hereby proposed. Utility Model Content

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a device for evaluating the thermal shock performance of thermal barrier coatings.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] An apparatus for evaluating the thermal shock performance of thermal barrier coatings includes a sample turntable with a vertically oriented rotating surface. Multiple sample placement slots are arranged evenly along the circumference of the rotating surface of the turntable on one side. The highest sample placement slot on the turntable is equipped with an oxyhydrogen flame torch for heating the sample and a laser infrared thermometer for monitoring the sample temperature. The laser infrared thermometer is connected to a temperature recorder to monitor and record the temperature of the sample surface. The turntable, oxyhydrogen flame torch, and laser infrared thermometer are all mounted on a substrate. The sample placement slots on the turntable are used to fix the sample to be evaluated for thermal shock. The laser infrared thermometer is placed perpendicular to the sample and is used to test the sample surface temperature. The nozzle of the oxyhydrogen flame torch is directly facing the sample to be tested, heating the sample to the evaluation temperature through the flame.

[0009] Specifically, a water tank is provided corresponding to the sample placement slot at the lowest position of the sample turntable. The highest water level in the water tank is higher than that in the sample placement slot at the lowest position of the sample turntable. The water tank is set on the base, and the sample can enter the water tank for cooling during the rotation of the sample turntable.

[0010] Specifically, the sample turntable is driven to rotate by a servo motor, which is fixed to the base by a bracket. The rotation of the sample turntable is controlled by a servo motor rotation control system. Sample placement slots are provided at certain angles along the circumference of the sample turntable. The servo motor rotation control system controls the sample turntable to rotate clockwise in a cyclical manner at certain angles and with corresponding intervals.

[0011] Specifically, the oxyhydrogen flame torch is fixed to the substrate by a torch fixing bracket, which is used to adjust the distance and angle between the nozzle of the oxyhydrogen flame torch and the sample. The torch fixing bracket can be adjusted up and down or left and right to ensure that the flame of the oxyhydrogen flame torch is facing the sample placement slot.

[0012] Furthermore, the hydrogen-oxygen flame torch is adjusted to have an angle α with the sample surface via a fixed bracket, wherein α is 60-70°.

[0013] Specifically, the hydrogen-oxygen flame torch is connected to an electrolytic water hydrogen-oxygen generator via an outlet pipe. The outlet pipe is also equipped with a one-way valve to prevent gas backflow. The electrolytic water hydrogen-oxygen generator is used to produce hydrogen and oxygen required for the thermal shock of the hydrogen-oxygen flame torch.

[0014] Specifically, the laser infrared thermometer has a measurement temperature range of 300–1500℃.

[0015] Specifically, the laser infrared thermometer is directly mounted on the substrate.

[0016] Specifically, during air cooling, no water is placed in the water tank, which can meet the air cooling requirements.

[0017] Compared with the prior art, the technical solution provided by this utility model has the following beneficial effects:

[0018] This invention overcomes the limitations of traditional high-temperature furnace heating, which cannot test temperatures above 1050℃ due to the limited temperature resistance of the high-temperature alloy substrate, and the drawbacks of traditional flame gradient heating, such as flammability, explosiveness, significant safety hazards, and high cost. It can meet the requirements for testing the thermal shock performance of thermal barrier coatings with a temperature resistance above 1050℃. This device, equipped with an oxyhydrogen flame torch for heating, a laser infrared thermometer for monitoring, and a temperature recorder for recording, can accurately monitor the sample surface temperature in real time, facilitating precise testing. The laser infrared thermometer has a temperature measurement range of 300-1500℃ and is suitable for testing novel thermal barrier coatings with a temperature resistance above 1200℃.

[0019] Furthermore, the sample turntable of this utility model is equipped with a water tank at its lowest position. When there is water, it can meet the requirements of conventional cooling. When the water tank is empty, it can achieve air cooling. In conjunction with the servo motor, the sample turntable is driven to rotate cyclically at a set speed and angle with intermittent time, which can effectively simulate thermal shock conditions and comprehensively evaluate the thermal shock performance of the thermal barrier coating. Attached Figure Description

[0020] The accompanying drawings are incorporated in and form part of this specification, and together with the description, serve to explain the principles of this invention.

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the thermal shock performance testing device of this utility model;

[0023] Figure 2 This is a front view of the sample turntable of this utility model.

[0024] Wherein: 1 is the sample turntable; 11 is the sample placement tank; 12 is the servo motor rotation control system; 2 is the water electrolysis hydrogen-oxygen generator; 21 is the gas check valve; 22 is the gas outlet pipe; 3 is the laser infrared thermometer; 4 is the water tank; 5 is the temperature recorder; 6 is the hydrogen-oxygen flame spray gun; 7 is the spray gun fixing bracket. Detailed Implementation

[0025] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this invention. Rather, they are merely examples of apparatuses consistent with some aspects of this invention as detailed in the appended claims.

[0026] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0027] Example 1

[0028] See Figure 1 and 2 As shown, this embodiment provides an apparatus for evaluating the thermal shock performance of thermal barrier coatings, including a sample turntable 1 with a vertically arranged rotating surface. Three sample placement slots 11 are provided on one side of the sample turntable 1, and these three slots are evenly arranged circumferentially along the rotating surface of the sample turntable 1. The highest sample placement slot 11 on the sample turntable 1 is equipped with an oxyhydrogen flame torch 6 for heating the sample and a laser infrared thermometer 3 for monitoring the sample temperature. The laser infrared thermometer 3 is connected to a temperature recorder 5 to monitor and record the temperature of the sample surface. The sample turntable 1, the oxyhydrogen flame torch 6, and the laser infrared thermometer 3 are all mounted on a substrate. The sample placement slots 11 on the sample turntable 1 are used to fix the sample to be evaluated for thermal shock. The laser infrared thermometer 3 is placed perpendicular to the sample and is used to test the sample surface temperature. The nozzle of the oxyhydrogen flame torch 6 is directly facing the sample to be tested, and the flame heats the sample to the evaluation temperature.

[0029] Specifically, a water tank 4 is provided corresponding to the lowest sample placement slot 11 of the sample turntable 1. The highest water level in the water tank 4 is higher than the lowest sample placement slot 11 of the sample turntable 1. The water tank 4 is set on the base, and the sample can enter the water tank 4 for cooling during the rotation of the sample turntable 1.

[0030] Specifically, the sample turntable 1 is driven to rotate by a servo motor, which is fixed to the base by a bracket. The rotation of the sample turntable 1 is controlled by a servo motor rotation control system 12. The sample turntable 1 is provided with sample placement slots 11 every 120 degrees in the circumferential direction. The servo motor rotation control system 12 controls the sample turntable 1 to perform clockwise cyclic rotation and corresponding interval time every 120 degrees.

[0031] Specifically, the oxyhydrogen flame spray gun 6 is fixed to the substrate by a spray gun fixing bracket 7. The spray gun fixing bracket 7 is used to adjust the distance and angle between the nozzle of the oxyhydrogen flame spray gun 6 and the sample. The spray gun fixing bracket 7 can be adjusted up and down or left and right to ensure that the flame of the oxyhydrogen flame spray gun 6 is facing the sample placement slot 11.

[0032] Furthermore, the hydrogen-oxygen flame torch 6 is adjusted to have an angle α with the sample surface via a fixed bracket 7, wherein α is 60-70°.

[0033] Specifically, the hydrogen-oxygen flame gun 6 is connected to the water electrolysis hydrogen-oxygen generator 2 via the gas outlet pipe 22. The gas outlet pipe 22 is also equipped with a one-way gas valve 21 to prevent gas backflow. The water electrolysis hydrogen-oxygen generator 2 is used to prepare the hydrogen and oxygen required for the thermal shock of the hydrogen-oxygen flame gun 6.

[0034] Specifically, the laser infrared thermometer 3 has a measurement temperature range of 300 to 1500℃.

[0035] Specifically, the laser infrared thermometer 3 is mounted on the base via a bracket.

[0036] This embodiment also provides a method for using the device, as detailed below:

[0037] During the thermal shock performance test of the thermal barrier coating, the electrolytic water hydrogen-oxygen generator 2, the laser infrared thermometer 3, and the temperature recorder 5 were turned on respectively. The sample was placed in the sample placement tank 11, the sample turntable 1 was started to rotate according to the set program, the hydrogen-oxygen flame spray gun 6 was turned on, and the coating flame heating test was carried out.

[0038] Example 2

[0039] The difference between this embodiment and embodiment 1 is that, during air cooling, no water is added to the water tank 4, which can meet the air cooling requirements.

[0040] The above description is merely a specific embodiment of this utility model, enabling those skilled in the art to understand or implement it. 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 this utility model.

[0041] It should be understood that this utility model is not limited to the content already described above, and various modifications and changes can be made without departing from its scope. The scope of this utility model is limited only by the appended claims.

Claims

1. A device for testing the thermal shock performance of thermal barrier coatings, characterized in that, The sample turntable (1) with a vertically arranged rotating surface is provided. Multiple sample placement slots (11) are provided on one side of the sample turntable (1). The multiple sample placement slots (11) are evenly arranged around the rotating surface of the sample turntable (1). The sample placement slot (11) at the highest position of the sample turntable (1) is provided with an oxyhydrogen flame torch (6) for heating the sample and a laser infrared thermometer (3) for monitoring the sample temperature. The laser infrared thermometer (3) is connected to a temperature recorder (5). The sample turntable (1), the oxyhydrogen flame torch (6), and the laser infrared thermometer (3) are all set on a substrate.

2. The apparatus according to claim 1, characterized in that, A water tank (4) is provided corresponding to the sample placement slot (11) at the lowest position of the sample turntable (1). The highest position of the water in the water tank (4) is higher than the sample placement slot (11) at the lowest position of the sample turntable (1). The water tank (4) is set on the base.

3. The apparatus according to claim 1, characterized in that, The sample turntable (1) is driven to rotate by a servo motor, which is fixed on the base by a bracket. The rotation of the sample turntable (1) is controlled by a servo motor rotation control system (12).

4. The apparatus according to claim 1, characterized in that, The oxyhydrogen flame gun (6) is fixed to the substrate by a gun fixing bracket (7), which is used to adjust the distance and angle between the nozzle of the oxyhydrogen flame gun (6) and the sample.

5. The apparatus according to claim 4, characterized in that, The hydrogen-oxygen flame torch (6) is adjusted to have an angle α with the sample surface by means of a fixed bracket (7), wherein α is 60-70°.

6. The apparatus according to claim 1, characterized in that, The hydrogen-oxygen flame gun (6) is connected to the water electrolysis hydrogen-oxygen generator (2) through the gas outlet pipe (22), and the gas outlet pipe (22) is also equipped with a gas check valve (21) to prevent gas backflow.

7. The apparatus according to claim 1, characterized in that, The laser infrared thermometer (3) has a measurement temperature range of 300 to 1500℃.

8. The apparatus according to claim 1, characterized in that, The laser infrared thermometer (3) is mounted on the base via a bracket.

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