Testing device and testing method for high-temperature protective coating

Abstract

The embodiment of the invention provides a testing device and a testing method for a high-temperature protective coating. The testing device comprises a ceramic crucible and a suspension assembly. Accommodating grooves are respectively formed in two opposite sides of the top of the ceramic crucible; the suspension assembly comprises a fixing part and a connecting part, and the two ends of the fixing part are movably installed on the top of the ceramic crucible through the corresponding containing grooves respectively. The first end of the connecting part is fixedly connected to the fixing part, and the second end of the connecting part extends towards the bottom of the ceramic crucible and is used for hanging a high-temperature protective coating sample, so that the high-temperature protective coating sample is hung in the ceramic crucible; and the connecting part is positioned in the ceramic crucible. According to the test device for the high-temperature protective coating disclosed by the embodiment of the invention, the oxidation uniformity of the high-temperature protective coating can be improved, so that the accuracy of a test result is improved, and the test efficiency can be effectively improved.

Description

Technical Field

[0001] The embodiments disclosed herein belong to the technical field of high-temperature protective coating testing fixtures, specifically relating to a testing device and testing method for high-temperature protective coatings. Background Technology

[0002] To prevent the failure of hot-end components such as low-pressure turbine blades and high-pressure turbine blades in ground gas turbines and aero engines due to long-term exposure to high-temperature oxidation and thermal corrosion, turbine blades are often coated with high-temperature protective coatings such as aluminide coatings, modified aluminide coatings, MCrAlY coatings, or thermal barrier coatings during application to improve their resistance to high-temperature corrosion.

[0003] When investigating the oxidation resistance of high-temperature protective coatings, crucibles are typically used as the sample carrier for high-temperature oxidation tests. However, when the coating sample is placed directly in the crucible, one side of the coating always adheres to the bottom of the crucible, resulting in uneven oxidation and affecting the test results. Currently, manual flipping is used to reduce experimental error, but this significantly impacts testing efficiency. Summary of the Invention

[0004] The embodiments disclosed herein are intended to at least address one of the technical problems existing in the prior art, and to provide a testing apparatus and testing method for high-temperature protective coatings.

[0005] On one hand, embodiments of this disclosure provide a testing apparatus for high-temperature protective coatings, the testing apparatus comprising:

[0006] A ceramic crucible, wherein receiving grooves are respectively opened on opposite sides of the top of the ceramic crucible;

[0007] A suspension assembly includes a fixing part and a connecting part. The two ends of the fixing part are movably mounted on the top of the ceramic crucible through corresponding receiving grooves. The first end of the connecting part is fixed to the fixing part, and its second end extends toward the bottom of the ceramic crucible and is used to suspend the high-temperature protective coating sample, so as to suspend the high-temperature protective coating sample inside the ceramic crucible. The connecting part is located inside the ceramic crucible.

[0008] Optionally, the connecting part includes a connector and a hook;

[0009] The first end of the connector is fixed to the fixing part, the second end of the connector is fixed to the first end of the hook, and the second end of the hook extends outward to form a hook shape to suspend the high-temperature protective coating sample.

[0010] Optionally, the fixing part is a horizontal bar, and the connecting part is a vertical bar.

[0011] Optionally, the suspension assembly has a T-shaped structure.

[0012] Optionally, the suspension assembly is made of high-temperature resistant glass.

[0013] Optionally, the ceramic crucible is made of alumina.

[0014] On the other hand, embodiments of this disclosure provide a testing method for high-temperature protective coatings, employing the testing apparatus described above, the testing method comprising:

[0015] The high-temperature protective coating sample is suspended at the second end of the connection.

[0016] Install the fixing part into the receiving groove at the top of the ceramic crucible;

[0017] An isothermal oxidation test was performed on the ceramic crucible connected to the high-temperature protective coating sample.

[0018] Optionally, the temperature range of the isothermal oxidation test is 800℃~1200℃.

[0019] The test apparatus and test method for high-temperature protective coatings disclosed herein, through the provided ceramic crucible and suspension assembly, can improve the uniformity of oxidation of the high-temperature protective coating, thereby improving the accuracy of the test results and effectively increasing the test efficiency. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a test apparatus for a high-temperature protective coating according to an embodiment of the present disclosure. Detailed Implementation

[0021] To enable those skilled in the art to better understand the technical solutions of this disclosure, the disclosure will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] In related technologies, since the coated sample is placed directly in the crucible, one side of the coating is always in contact with the bottom surface of the crucible, which can cause uneven oxidation of the coated sample and affect the test results. Furthermore, it requires manual labor to flip the coated sample, resulting in low test efficiency. To solve these problems, the inventors designed a testing device 100 for high-temperature protective coatings.

[0023] like Figure 1As shown, a testing apparatus 100 for high-temperature protective coatings includes a ceramic crucible 110 and a suspension assembly 120. The ceramic crucible 110 has receiving grooves (not shown) on opposite sides of its top. The suspension assembly 120 includes a fixing part 121 and a connecting part 122. Both ends of the fixing part 121 are movably mounted to the top of the ceramic crucible 110 via corresponding receiving grooves. The first end of the connecting part 122 is fixed to the fixing part 121, and its second end extends towards the bottom of the ceramic crucible 110 and is used to suspend the high-temperature protective coating sample, thus suspending the sample within the ceramic crucible 110. The connecting part 122 is located inside the ceramic crucible 110.

[0024] Specifically, such as Figure 1 As shown, during the test, the high-temperature protective coating sample is first suspended from the second end of the connecting part 122. The connecting part 122 includes a connector 1221 and a hook 1222. The first end of the connector 1221 is fixed to the fixing part 121, and the second end of the connector 1221 is fixed to the first end of the hook 1222. The second end of the hook 1222 is bent outward to form a hook shape to suspend the high-temperature protective coating sample.

[0025] The high-temperature protective coating sample can be suspended via the hook 1222. For example, the high-temperature protective coating sample can have a structure with a through hole, which is then inserted through the hook 1222 to achieve suspension. This reduces the contact area between the high-temperature protective coating sample and the ceramic crucible 110, ensuring that the high-temperature protective coating sample has a larger area in contact with the air, allowing for uniform oxidation and avoiding manual turning. Alternatively, the high-temperature protective coating sample can be directly draped and suspended on the hook 1222, with its inclined design allowing it to be engaged with the hook 1222 by its side. Compared to placing it directly inside the ceramic crucible 110, this also reduces the contact area, resulting in a larger area in direct contact with the air and thus achieving uniform oxidation.

[0026] Next, the fixing part 121 is fixedly installed in the receiving grooves on opposite sides of the top of the ceramic crucible 110, with both ends of the fixing part 121 respectively fixed to the corresponding receiving grooves on both sides. At this time, under the action of the fixing part 121, the high-temperature protective coating sample is located inside the ceramic crucible 110. The ceramic crucible 110 is then placed in a muffle furnace for isothermal oxidation test, and the oxidation weight gain result of the high-temperature protective coating sample can be obtained, thereby enabling the evaluation and analysis of the oxidation resistance of the corresponding high-temperature protective coating.

[0027] The testing apparatus for high-temperature protective coatings disclosed herein, through the provided ceramic crucible and suspension assembly, can increase the contact area between the high-temperature protective coating and air, thereby improving the uniformity of its oxidation, the accuracy of the test results, and effectively improving the test efficiency, avoiding the need for manual flipping of the high-temperature protective coating.

[0028] For example, such as Figure 1 As shown, the fixing part 121 is a horizontal bar, and the connecting member 1221 is a vertical bar. Both ends of the horizontal bar are fixedly connected to corresponding receiving grooves on the top of the ceramic crucible 110. One end of the vertical bar is connected to the central area of ​​the horizontal bar, and the other end is connected to the hook member 1222. The horizontal bar and the receiving groove of the ceramic crucible 110 are detachably connected, facilitating sampling and crucible cleaning. Furthermore, the suspension assembly 120 has an overall T-shaped structure.

[0029] For example, the suspension assembly 120 is made of high-temperature resistant glass, which facilitates isothermal oxidation experiments. Further, the ceramic crucible 110 is made of alumina.

[0030] The testing apparatus for high-temperature protective coatings disclosed herein can increase the contact area between the high-temperature protective coating and air, thereby causing uniform oxidation of the coating, obtaining more accurate test results, and effectively improving test efficiency.

[0031] On the other hand, embodiments of this disclosure provide a testing method for high-temperature protective coatings, employing the testing apparatus described above. The specific structure of the testing apparatus is as described previously and will not be repeated here. The testing method includes: suspending the high-temperature protective coating sample at the second end of the connecting part; installing the fixing part into the receiving groove at the top of the ceramic crucible; and performing a constant-temperature oxidation test on the ceramic crucible with the high-temperature protective coating sample connected to it.

[0032] Specifically, refer to Figure 1 During the test, the high-temperature protective coating sample is first suspended from the second end of the connecting part 122. Then, the fixing part 121 is fixedly installed in the receiving grooves on opposite sides of the top of the ceramic crucible 110, with both ends of the fixing part 121 fixed to the corresponding receiving grooves on both sides. At this time, under the action of the fixing part 121, the high-temperature protective coating sample is located inside the ceramic crucible 110. The ceramic crucible 110 is then placed in a muffle furnace for a constant-temperature oxidation test, ultimately obtaining the corresponding oxidation resistance of the high-temperature protective coating. As a specific example, the temperature range of the constant-temperature oxidation test is 800℃~1200℃. Tests can be conducted at 800℃, 900℃, 1000℃, 1100℃, and 1200℃.

[0033] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of this disclosure, and this disclosure is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and substance of this disclosure, and these modifications and improvements are also considered to be within the scope of protection of this disclosure.

Claims

1. A testing apparatus for high-temperature protective coatings, characterized in that, The test apparatus includes: A ceramic crucible, wherein receiving grooves are respectively opened on opposite sides of the top of the ceramic crucible; A suspension assembly includes a fixing part and a connecting part. The two ends of the fixing part are movably mounted on the top of the ceramic crucible through corresponding receiving grooves. The first end of the connecting part is fixed to the fixing part, and its second end extends toward the bottom of the ceramic crucible and is used to suspend the high-temperature protective coating sample, so as to suspend the high-temperature protective coating sample inside the ceramic crucible. The connecting part is located inside the ceramic crucible.

2. The testing apparatus for high-temperature protective coatings according to claim 1, characterized in that, The connecting part includes a connector and a hook; The first end of the connector is fixed to the fixing part, the second end of the connector is fixed to the first end of the hook, and the second end of the hook extends outward to form a hook shape to suspend the high-temperature protective coating sample.

3. The testing apparatus for high-temperature protective coatings according to claim 2, characterized in that, The fixing part is a horizontal bar, and the connecting part is a vertical bar.

4. The testing apparatus for high-temperature protective coatings according to claim 3, characterized in that, The suspension assembly has a T-shaped structure.

5. The testing apparatus for high-temperature protective coatings according to claim 1, characterized in that, The suspension assembly is made of high-temperature resistant glass.

6. The testing apparatus for high-temperature protective coatings according to any one of claims 1 to 5, characterized in that, The ceramic crucible is made of alumina.

7. A test method for high-temperature protective coatings, characterized in that, The test method, using the test apparatus according to any one of claims 1 to 6, comprises: The high-temperature protective coating sample is suspended at the second end of the connection. Install the fixing part into the receiving groove at the top of the ceramic crucible; An isothermal oxidation test was performed on the ceramic crucible connected to the high-temperature protective coating sample.

8. The test method for high-temperature protective coatings according to claim 7, characterized in that, The temperature range of the isothermal oxidation test is 800℃~1200℃.

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