A thermal barrier coating specimen clamping device and method

Abstract

The application discloses a thermal barrier coating sample clamping device and a clamping method, relates to the field of thermal barrier coating near working condition service environment simulation test systems, and comprises a work station connecting plate, an elbow joint and a clamp. The clamp comprises a first connecting mechanism, a second connecting mechanism and two symmetrically arranged clamping plates. After the two clamping plates are butted, two flow channel grooves are butted to form a first flow channel, and two half holes are butted to form a positioning hole. The positioning hole is used for positioning a thermal barrier coating sample. The thermal barrier coating sample is in linear contact with the clamping plate, and the thermal barrier coating sample can move in the positioning hole. The second connecting mechanism is used for mounting the two clamping plates on the upper portion of the work station connecting plate. The inside of the work station connecting plate is provided with a second flow channel. The bottom of the first flow channel is in communication with the second flow channel. The clamping device and the clamping method can make the back cooling air flow and the thermal barrier coating sample fully exchange heat, and simultaneously reduce the heat conduction of the thermal barrier coating sample and the clamp and the stress of the thermal barrier coating sample suffered from the clamp.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of thermal barrier coating near-service environment simulation test system, in particular to a thermal barrier coating sample clamping device and clamping method. BACKGROUND

[0002] With the increasing of the advanced aero turbine engine thrust-to-weight ratio, the temperature of the turbine blade at the hot end inside the engine has reached about 1700℃, but the limit temperature capacity of the nickel-based superalloy is only 1100℃. The application of thermal barrier coating technology on the surface of the part can reduce the surface temperature of the part and prolong the service life of the part. On this basis, the method for evaluating the service life and performance of the thermal barrier coating has become the focus of researchers.

[0003] At present, there are various methods for evaluating the performance of thermal barrier coatings, among which the simulation test system for simulating the service environment of the coating under near-service conditions is an advanced method for evaluating the comprehensive performance of the thermal barrier coating. The simulation test systems and test methods in the patent numbers “202110453457.8”, “202110766353.2” and “202211354464.3” can simulate conditions such as high-temperature high-speed flame, internal cooling gas flow of the blade, and erosion of external particles. During the test, the sample clamping system is needed to fix the sample, and during the test process, the sample and the clamping system as a whole are in a temperature gradient field, so the sample not only exchanges heat with the flame on its surface and the cooling gas flow on its back, but also conducts heat with the contact points and surfaces of the clamping system. However, the contact area between the sample and the clamping system in the prior art is too large, and the heat conduction generated will significantly reduce the temperature of the sample, thereby affecting the experimental results. At the same time, in the clamp mentioned in the patent number “202111222035.6”, two spring sheets press the temperature measuring probe against the back of the sample, so that the sample will additionally bear the stress of the spring sheets during the experiment. It can be seen that the clamping system in the prior art generates stress on the surface of the sample, which will significantly accelerate the failure of the thermal barrier coating, thereby having a great influence on the experimental results. In addition, in the clamps mentioned in the patent numbers “201820013201.9” and “201810008863.1”, the back cooling of the sample is directly from the gas nozzle to the back of the sample. The back of the sample not only exchanges heat with the cooling gas flow, but also exchanges heat with the surrounding room temperature air, which leads to a significant change in the distance between the gas nozzle and the sample, which can greatly affect the thermal state of the sample, and has a serious impact on the test results of the thermal barrier coating thermal insulation performance and service life. SUMMARY

[0004] To solve the above technical problems, the application provides a thermal barrier coating sample clamping device and a clamping method, which can make the back cooling air flow fully exchange heat with the thermal barrier coating sample, and reduce the heat conduction between the thermal barrier coating sample and the clamp and the stress of the thermal barrier coating sample.

[0005] To achieve the above object, the application provides the following scheme.

[0006] The application provides a thermal barrier coating sample clamping device, which comprises a work station connecting plate, an elbow joint and a clamp, the clamp comprises a first connecting mechanism, a second connecting mechanism and two symmetrically arranged clamping plates, each clamping plate is provided with a flow channel groove on the side close to the other clamping plate, the flow channel groove penetrates through the top, the bottom and the butt joint surface of the clamping plate, each clamping plate is provided with a half hole on the side close to the other clamping plate, the two clamping plates are connected through the first connecting mechanism, the two flow channel grooves form a first flow channel after butt joint, and the two half holes form a positioning hole after butt joint, the positioning hole is used for positioning the thermal barrier coating sample, the thermal barrier coating sample is in linear contact with the clamping plate, and the thermal barrier coating sample can move in the positioning hole, the second connecting mechanism is used for mounting the two clamping plates on the upper part of the work station connecting plate, the inside of the work station connecting plate is provided with a second flow channel, the bottom of the first flow channel is in communication with the second flow channel, and the elbow joint is arranged on the lower part of the work station connecting plate and is in communication with the second flow channel.

[0007] Preferably, the front side and the rear side of the upper part of each clamping plate are respectively provided with a front ear plate and a rear ear plate, the first connecting mechanism comprises two first connecting assemblies, one first connecting assembly is used for connecting two front ear plates, and the other first connecting assembly is used for connecting two rear ear plates, the first connecting assembly comprises a first bolt and two first nuts, the front ear plate is provided with a first through hole through which the first bolt passes, the rear ear plate is provided with a second through hole through which the first bolt passes, the first bolt is used for passing through two first through holes or two second through holes, and the two first nuts are used for being respectively mounted on the two ends of the first bolt.

[0008] Preferably, the bottom of each clamping plate close to the other clamping plate is provided with a protruding block, the two protruding blocks form a positioning block after butt joint of the two clamping plates, the top of the work station connecting plate is provided with a positioning groove matched with the structure of the positioning block, and the positioning block can be clamped in the positioning groove.

[0009] Preferably, one side of each of the clamping plates is provided with a connecting lug plate, the second connecting mechanism comprises two second connecting assemblies, each of the second connecting assemblies is used for mounting one of the connecting lug plates on the work station connecting plate, the second connecting assembly comprises a second bolt and two second nuts, each of the second bolts is used for sequentially penetrating through one of the connecting lug plates and the work station connecting plate, and the two second nuts are used for being mounted at two ends of the second bolt respectively.

[0010] Preferably, an annular protrusion is arranged on the inner wall of the positioning hole, a thermal barrier coating is coated on the annular protrusion, an annular groove is arranged on the side wall of the thermal barrier coating sample, the annular protrusion is arranged in the annular groove, and the annular protrusion and the annular groove are in linear contact.

[0011] Preferably, the annular protrusion is an annular wedge-shaped protrusion, a cross section of the annular wedge-shaped protrusion is a first isosceles triangle, the annular groove is an annular wedge-shaped groove, a cross section of the annular wedge-shaped groove is a second isosceles triangle, and an apex angle of the first isosceles triangle is smaller than an apex angle of the second isosceles triangle.

[0012] Preferably, a rear side of the thermal barrier coating sample is flush with a front side of the first flow channel in the clamping plate.

[0013] Preferably, a pressure monitoring component mounting hole is arranged on a rear side of one of the clamping plates, and a temperature monitoring component mounting hole is arranged on a rear side of the other clamping plate.

[0014] Preferably, the work station frame comprises a top plate and a stand column arranged at a lower part of the top plate, and the third connecting mechanism comprises two third connecting assemblies, the third connecting assembly comprises a third bolt, two third lower nuts and two third upper nuts, one of the third bolts is used for sequentially penetrating through the top plate and one side of the work station connecting plate, the other third bolt is used for sequentially penetrating through the top plate and the other side of the work station connecting plate, the two third lower nuts are mounted at lower parts of the third bolts, and the two third lower nuts are arranged above and below the top plate respectively, and the two third upper nuts are mounted at upper parts of the third bolts, and the two third upper nuts are arranged above and below the work station connecting plate respectively.

[0015] The application also provides a clamping method based on the thermal barrier coating sample clamping device, which comprises the following steps:

[0016] Step one, butt joint the two clamping plates and clamp the thermal barrier coating sample in the positioning hole, and place the butt jointed two clamping plates on the upper part of the work station connecting plate.

[0017] Step two, pre-tighten two clamping plates on the work station connecting plate through the second connecting mechanism;

[0018] Step three, pre-tighten two clamping plates through the first connecting mechanism, then lock and fix two clamping plates on the work station connecting plate through the second connecting mechanism, and finally lock and fix two clamping plates through the first connecting mechanism.

[0019] The present application has the following technical effects compared with the prior art:

[0020] In the thermal barrier coating sample clamping device of the present application, after the butt joint of two clamping plates, the butt joint of two flow channel grooves forms a first flow channel, and the butt joint of two half holes forms a positioning hole. The positioning hole is used for positioning the thermal barrier coating sample. The thermal barrier coating sample is in line contact with the clamping plate. The line contact greatly reduces the heat conduction between the thermal barrier coating sample and the clamping plate, and reduces the influence of heat conduction on the experimental results. The positioning hole can limit the movement of the thermal barrier coating sample in the front and back directions, thereby realizing the positioning of the thermal barrier coating sample. The thermal barrier coating sample can move in the positioning hole, that is, the positioning hole allows the thermal barrier coating sample to move relative to the positioning hole while positioning the thermal barrier coating sample. The thermal barrier coating sample is only subjected to the reaction force of the gravity of the clamping plate and the cooling gas and flame gas power. The thermal barrier coating sample will not be subjected to other stresses due to cooperation with the clamping plate. The influence of stress on the experimental results is reduced. In the present application, the flow of back cooling gas is limited in the first flow channel. Therefore, compared with the traditional back cooling, the heat exchange between the back cooling gas and the thermal barrier coating sample of the present application is more sufficient. The heat accumulation in the clamping plate can be timely discharged. Therefore, the design volume of the clamping plate can be greatly reduced compared with the traditional thermal shock test, and the service life of the clamping plate is also prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. Those skilled in the art can also obtain other drawings according to these drawings without creating any creative labor.

[0022] Figure 1 The first perspective structural schematic diagram of the thermal barrier coating sample clamping device provided by the present application;

[0023] Figure 2 The second perspective structural schematic diagram of the thermal barrier coating sample clamping device provided by the present application;

[0024] Figure 3 The cross-sectional view of the thermal barrier coating sample clamping device provided by the present application;

[0025] Figure 4 Structure diagram of the hot barrier coating sample clamping device provided by the present application after the two clamping plates are butted;

[0026] Figure 5 Structure diagram of the hot barrier coating sample provided by the present application in the hot barrier coating sample clamping device;

[0027] Figure 6 Structure diagram of the clamping plate provided by the present application in the hot barrier coating sample clamping device;

[0028] Figure 7 Structure diagram of the work station connecting plate provided by the present application in the hot barrier coating sample clamping device.

[0029] The figure mark explanation: 100, hot barrier coating sample clamping device; 1, work station connecting plate; 2, elbow joint; 3, clamping plate; 4, first flow channel; 41, flow channel groove; 5, positioning hole; 51, half hole; 6, positioning block; 61, protruding block; 7, positioning groove; 8, second flow channel; 9, front lug plate; 10, first through hole; 11, rear lug plate; 12, second through hole; 13, first bolt; 14, first nut; 15, connecting lug plate; 16, third through hole; 17, fourth through hole; 18, fifth through hole; 19, second bolt; 20, second nut; 21, pressure monitoring component mounting hole; 22, temperature monitoring component mounting hole; 23, work station frame; 231, top plate; 232, stand column; 24, third bolt; 25, third upper nut; 26, third lower nut; 27, annular protrusion; 28, hot barrier coating sample; 29, annular groove. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0031] The purpose of the present application is to provide a hot barrier coating sample clamping device and clamping method, which can allow the back cooling air flow to fully exchange heat with the hot barrier coating sample, while reducing the heat conduction of the hot barrier coating sample and the stress of the hot barrier coating sample on the clamp.

[0032] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0033] As Figures 1-7As shown, the embodiment provides a thermal barrier coating sample clamping device 100, which comprises a work station connecting plate 1, an elbow joint 2 and a clamp, the clamp comprises a first connecting mechanism, a second connecting mechanism and two symmetrically arranged clamping plates 3, the opposite sides of the two clamping plates 3 are butt joint surfaces, each clamping plate 3 is provided with a flow channel groove 41 on the side close to the other clamping plate 3, the flow channel groove 41 penetrates through the top, bottom and butt joint surface of the clamping plate 3, each clamping plate 3 is provided with a half hole 51 on the side close to the other clamping plate 3 on the front side, the two clamping plates 3 are connected through the first connecting mechanism, the two flow channel grooves 41 form a first flow channel 4 after the butt joint of the two clamping plates 3, and the two half holes 51 form a positioning hole 5, the positioning hole 5 is used for positioning the thermal barrier coating sample 28, the thermal barrier coating sample 28 is in line contact with the clamping plate 3, which greatly reduces the heat conduction between the thermal barrier coating sample 28 and the clamping plate 3, and reduces the influence of heat conduction on the experimental results; and the thermal barrier coating sample 28 can move in the positioning hole 5, specifically, the positioning hole 5 is used for limiting the movement of the thermal barrier coating sample 28 in the front-back direction, thereby realizing the positioning of the thermal barrier coating sample 28, and there is a gap between the thermal barrier coating sample 28 and the positioning hole 5, so that the thermal barrier coating sample 28 can move in the positioning hole 5 except for the front-back direction, that is, the positioning hole 5 enables the thermal barrier coating sample 28 to move relative to the positioning hole 5 while positioning the thermal barrier coating sample 28, so that the thermal barrier coating sample 28 is only subjected to the reaction force of the gravity of the clamping plate 3 and the cooling gas and flame gas power, and the thermal barrier coating sample 28 will not be subjected to other stresses due to cooperation with the clamping plate 3, thereby reducing the influence of stress on the experimental results; the second connecting mechanism is used for mounting the two clamping plates 3 on the upper part of the work station connecting plate 1, the inside of the work station connecting plate 1 is provided with a second flow channel 8, the bottom of the first flow channel 4 communicates with the second flow channel 8, the elbow joint 2 is arranged on the lower part of the work station connecting plate 1, and the elbow joint 2 communicates with the second flow channel 8.

[0034] In the embodiment, the back surface of the thermal barrier coating sample 28 is completely in the first flow channel 4 composed of the clamp, the first flow channel 4 communicates with the second flow channel 8 in the work station connecting plate 1, and the second flow channel 8 is connected with the compressed air nozzle through the elbow joint 2. It can be seen that in the embodiment, the flow of the back cooling gas is limited in the first flow channel 4, so compared with the traditional back cooling, the heat exchange between the back cooling gas and the thermal barrier coating sample 28 in the embodiment is more sufficient, so that the heat accumulation in the inside of the clamping plate 3 can be timely discharged, therefore, the design volume of the clamping plate 3 can be greatly reduced compared with the traditional thermal shock test, and the service life is also prolonged.

[0035] As Figures 1-3As shown, the front side and the rear side of the upper part of each clamping plate 3 are respectively provided with a front lug plate 9 and a rear lug plate 11, the first connecting mechanism includes two first connecting assemblies, one first connecting assembly is used for connecting two front lug plates 9, and the other first connecting assembly is used for connecting two rear lug plates 11; the first connecting assembly includes a first bolt 13 and two first nuts 14, the first through hole 10 through which the first bolt 13 passes is arranged on the front lug plate 9, the second through hole 12 through which the first bolt 13 passes is arranged on the rear lug plate 11, the first bolt 13 is used for passing through the two first through holes 10 or the two second through holes 12, and the two first nuts 14 are used for being respectively installed at both ends of the first bolt 13. Specifically, one first bolt 13 passes through the two first through holes 10 in sequence, and the first nuts 14 at both ends of the first bolt 13 are installed and abut against the outer sides of the two front lug plates 9 respectively after installation; another first bolt 13 passes through the two second through holes 12 in sequence, and the second nuts 20 at both ends of the first bolt 13 are installed and abut against the outer sides of the two rear lug plates 11 respectively after installation, thereby applying a horizontal clamping force to the two clamping plates 3, and thereby realizing clamping of the upper half part of the clamping plate 3.

[0036] As shown in Figure 4 and Figure 7 shown, the bottom of each clamping plate 3 near the side of the other clamping plate 3 is provided with a protrusion 61, and the two protrusions 61 abut to form a positioning block 6 after the two clamping plates 3 are abutted, the top of the station connecting plate 1 is provided with a positioning groove 7 matched with the structure of the positioning block 6, the positioning block 6 can be clamped in the positioning groove 7, the first flow channel 4 penetrates the bottom surface of the positioning block 6, and the second flow channel 8 penetrates the bottom surface of the positioning groove 7, thereby realizing the communication between the second flow channel 8 and the first flow channel 4. In the embodiment, the structure matched by the positioning block 6 and the positioning groove 7 makes it convenient to position the two clamping plates 3, and meanwhile, the positioning block 6 cooperates with the positioning groove 7 of the station connecting plate 1 to form a seal, thereby improving the sealing between the clamping plate 3 and the station connecting plate 1.

[0037] In the embodiment, the bottom edge of the positioning block 6 is provided with a first rounded corner structure, the bottom edge of the positioning groove 7 is provided with a second rounded corner structure, the second rounded corner structure is matched with the structure of the first rounded corner structure, and thereby the positioning block 6 can be tightly attached to the positioning groove 7.

[0038] The side of each clamping plate 3 away from the other clamping plate 3 is provided with a connecting lug plate 15, in this embodiment, the bottom surface of the connecting lug plate 15 is flush with the bottom surface of the clamping plate 3. The second connecting mechanism includes two second connecting assemblies, each of which is used to mount one connecting lug plate 15 on the station connecting plate 1; the second connecting assembly includes a second bolt 19 and two second nuts 20, each second bolt 19 is used to pass through one connecting lug plate 15 and the station connecting plate 1 in turn, and the two second nuts 20 are used to be mounted on the two ends of the second bolt 19 respectively. The clamping plate 3, the connecting lug plate 15 and the protrusion 61 in this embodiment are of an integrated structure.

[0039] Specifically, each connecting lug plate 15 is provided with a third through hole 16 for the second bolt 19 to pass through, and the two sides of the station connecting plate 1 are provided with a fourth through hole 17 for the second bolt 19 to pass through, during installation, each second bolt 19 passes through one third through hole 16 and one fourth through hole 17 in turn, and the second nut 20 at the upper end of each second bolt 19 abuts against the upper part of the connecting lug plate 15, and the second nut 20 at the lower end of each second bolt 19 abuts against the lower part of the station connecting plate 1, thereby realizing the fixation of the clamping plate 3 and the station connecting plate 1. In this embodiment, the height of the positioning block 6 in the vertical direction is greater than the depth of the positioning groove 7 in the vertical direction, so that there is a gap between the bottom surface of the connecting lug plate 15 and the top surface of the station connecting plate 1 after assembly, the existence of the gap can make the first reverse chamfer structure and the second reverse chamfer structure completely pressed against each other to form a seal when fastened, and can reduce the heat conduction of the clamping plate 3 to the station connecting plate 1 during the thermal shock test. In this specific embodiment, the gap between the bottom surface of the connecting lug plate 15 and the top surface of the station connecting plate 1 after assembly is 0.5mm.

[0040] In this embodiment, the connection between the clamping plate 3 and the station connecting plate 1 is a bolt and nut connection, and through holes are formed in the corresponding parts, so that when the bolt and nut are deformed due to excessively harsh thermal shock conditions, the bolt and nut can still be smoothly disassembled. The station connecting plate 1 can be used as a standard part, which can realize the clamping of different geometric shape samples in cooperation with the design of the clamping plate 3. For different geometric shape samples, as long as the first flow channel 4 inside the clamping plate 3 and the second flow channel 8 of the station connecting plate 1 can be connected, the control of the back cooling air flow can be realized, thereby improving the repeatability of the thermal shock test.

[0041] As Figure 4 and Figure 5As shown, the inner wall of the positioning hole 5 is provided with an annular protrusion 27, the annular protrusion 27 is coated with a thermal barrier coating, the side wall of the thermal barrier coating sample 28 is provided with an annular groove 29, the annular protrusion 27 is arranged in the annular groove 29, and the annular protrusion 27 and the annular groove 29 are in line contact. By spraying the thermal barrier coating on the annular protrusion 27 in contact with the clamping plate 3, the heat conduction between the thermal barrier coating sample 28 and the clamping plate 3 is reduced. The structure of the annular protrusion 27 matched with the annular groove 29 positions the thermal barrier coating sample 28 in the front-back direction, that is, limits the movement of the thermal barrier coating sample 28 in the front-back direction; and the size of the annular protrusion 27 is smaller than the size of the annular groove 29, so that the thermal barrier coating sample 28 can move in the positioning hole 5 except in the front-back direction, that is, the thermal barrier coating sample 28 can move in the positioning hole 5.

[0042] In the embodiment, the annular protrusion 27 is an annular wedge-shaped protrusion, the cross section of the annular wedge-shaped protrusion is a first isosceles triangle, the annular groove 29 is an annular wedge-shaped groove, the cross section of the annular wedge-shaped groove is a second isosceles triangle, the top angle of the first isosceles triangle is smaller than the top angle of the second isosceles triangle, that is, the annular wedge-shaped protrusion only has a sharp end in contact with the annular wedge-shaped groove, thereby realizing the line contact between the thermal barrier coating sample 28 and the clamping plate 3.

[0043] Specifically, the thermal barrier coating sample 28 in the embodiment is a circular plate, the positioning hole 5 is a circular hole, and the thermal barrier coating sample 28 can rotate in the positioning hole 5. The annular wedge-shaped protrusion is a circular annular wedge-shaped protrusion, and the annular wedge-shaped groove is a circular annular wedge-shaped groove. In the embodiment, the diameter of the circular ring at the sharp end of the circular annular wedge-shaped protrusion is greater than the diameter of the circular ring at the sharp end of the circular annular wedge-shaped groove, that is, there is a gap between the thermal barrier coating sample 28 and the clamping plate 3, thereby realizing the positioning of the thermal barrier coating sample 28 while preventing the clamping plate 3 from generating additional stress on the thermal barrier coating sample 28.

[0044] As shown in the figure, Figure 3 The rear side of the thermal barrier coating sample 28 is flush with the front side of the first flow channel 4 in the clamping plate 3, thereby realizing the uniform flow state of the back cooling gas flow without interference and ensuring the repeatability and accuracy of the experimental results. At the same time, the front side of the thermal barrier coating sample 28 protrudes forward relative to the front side of the clamping plate 3, thereby ensuring that the surface state of the clamping plate 3 does not affect the heat exchange between the flame flow and the surface of the thermal barrier coating sample 28 during the experiment.

[0045] In the embodiment, the two clamping plates 3 are butted to form a hollow cuboid structure, and the hollow cuboid and the rear side of the thermal barrier coating sample 28 together form a back cooling gas flow channel. The back cooling gas flow channel in the embodiment is a cuboid back cooling gas flow channel.

[0046] A pressure monitoring component mounting hole 21 is arranged on the rear side of one clamping plate 3, and a temperature monitoring component mounting hole 22 is arranged on the rear side of the other clamping plate 3. After the temperature monitoring component and the pressure monitoring component are installed, real-time monitoring of the temperature, pressure and flow rate of the back cooling air flow can be achieved. If there is no monitoring requirement, the above-mentioned hole positions can be sealed by using corresponding type screws. In this embodiment, the pressure, temperature and flow rate data of the back cooling air flow when the back cooling air flow flows at the back of the thermal barrier coating sample 28 can be obtained in real time, and the flow state of the back cooling air flow can be conveniently calculated for comparison with the real service environment. If temperature control and pressure control are matched at the compressed air inlet end, closed-loop automatic control of the back cooling air flow state can also be achieved.

[0047] Specifically, the temperature monitoring component adopts a thermocouple, and the pressure monitoring component includes an L-shaped pitot tube and a micro pressure sensor connected together. In this embodiment, the total pressure and static pressure measured by the L-shaped pitot tube are used to obtain the dynamic pressure conversion flow rate, and at the same time, the temperature monitoring can correct the density of the gas at this position to obtain the accurate flow rate. The temperature monitoring component mounting hole 22 adopts a 0.7 mm diameter inclined through hole, and the pressure monitoring component mounting hole 21 adopts a 5 mm diameter threaded hole, which are respectively used for installing the armored thermocouple and the L-shaped pitot tube. When the armored thermocouple is installed, the thermocouple can be welded in the inclined through hole by spot welding to ensure that the clamping plate 3 supports the thermocouple wire and prevents the thermocouple from falling off during thermal shock testing. The L-shaped pitot tube is installed in the threaded hole, which can ensure firm installation and the sealing of the clamp.

[0048] The upper end of the elbow joint 2 in this embodiment is provided with an external thread, and the lower part of the work station connecting plate 1 is provided with a threaded hole. The elbow joint 2 is installed in the threaded hole, and the elbow joint 2 in this embodiment is a 90° elbow joint.

[0049] As shown in Figs. Figure 1 and Figure 2 This embodiment further includes a work station frame 23 and a third connecting mechanism. The work station frame 23 includes a top plate 231 and a stand 232 arranged at the lower part of the top plate 231. The third connecting mechanism is used to connect the work station connecting plate 1 and the top plate 231. The third connecting mechanism includes two third connecting assemblies. The two third connecting assemblies are used to connect the two sides of the work station connecting plate 1 and the top plate 231 respectively. The third connecting assembly includes a third bolt 24, two third lower nuts 26 and two third upper nuts 25. One third bolt 24 is used to pass through one side of the top plate 231 and the work station connecting plate 1 in sequence, and the other third bolt 24 is used to pass through the other side of the top plate 231 and the work station connecting plate 1 in sequence. The two third lower nuts 26 are both installed at the lower part of the third bolt 24, and the two third lower nuts 26 are located above and below the top plate 231 respectively. The two third upper nuts 25 are both installed at the upper part of the third bolt 24, and the two third upper nuts 25 are located above and below the work station connecting plate 1 respectively.

[0050] Specifically, the two sides of the station connecting plate 1 are provided with a fifth through hole 18, and the two sides of the top plate 231 are provided with a sixth through hole. During installation, the two ends of each third bolt 24 respectively pass through a sixth through hole and a fifth through hole 18 to the outside, and the two third lower nuts 26 installed at the lower part of the third bolt 24 are respectively abutted against the upper part and the lower part of the top plate 231, and the two third upper nuts 25 installed at the upper part of the third bolt 24 are respectively abutted against the upper part and the lower part of the station connecting plate 1, thereby fixing the station connecting plate 1 on the top plate 231 to achieve the fixed installation of the station connecting plate 1 and the station frame 23.

[0051] In the embodiment, the material of the clamping plate 3 is a high-temperature alloy, and the other parts are made of 304 stainless steel. Except that the clamping plate 3 and the station connecting plate 1 are non-standard parts, the other parts are standard parts. This design can significantly reduce the manufacturing cost of the clamping device, and the simple geometric shape can also save manufacturing time, and has high reliability and easy maintenance.

[0052] In the embodiment, the connection of each part is achieved by bolt and nut connection, so that each part can be easily disassembled and separated after thermal deformation to take out the thermal barrier coating sample 28. Further, the diameter of the through hole at the connection of each part is slightly larger than the outer diameter of the corresponding bolt. When subjected to thermal shock, each part will expand to a certain extent. The through hole with a slightly larger diameter can effectively avoid stress between the parts due to thermal expansion, thereby improving the service life of the clamping device. Even if the parts are deformed, they can be quickly disassembled and replaced with new parts.

[0053] The embodiment also provides a clamping method based on the thermal barrier coating sample clamping device 100, which comprises the following steps:

[0054] Step one, first positioning, abutting the two clamping plates 3 and clamping the thermal barrier coating sample 28 in the positioning hole 5, and placing the two abutted clamping plates 3 on the upper part of the station connecting plate 1, i.e. placing the positioning block 6 in the positioning groove 7 of the station connecting plate 1, so that the third through hole 16 on the connecting lug plate 15 is aligned with the fourth through hole 17 on the station connecting plate 1.

[0055] Step two, pre-tightening, pre-tightening the two clamping plates 3 on the station connecting plate 1 through the second connecting mechanism; specifically, passing each second bolt 19 through a third through hole 16 and a fourth through hole 17, and slightly locking two second nuts 20 to the clamping plate 3 so that the clamping plate 3 no longer shakes. At this time, a combined body of the clamp, the thermal barrier coating sample 28 and the station connecting plate 1 is formed.

[0056] Step three, finally clamp, through the first connecting mechanism to the two clamping plate 3 pre-tightening installation, then through the second connecting mechanism will be locked and fixed on the work station connecting plate 1 two clamping plate 3, finally through the first connecting mechanism will be locked and fixed two clamping plate 3. Specifically, the first bolt 13 through the clamping plate 3 upper two first through hole 10 or two second through hole 12, with the first nut 14 slightly locked to not shake, then the second nut 20 on the second bolt 19 is tightened, pay attention to the gap between the connecting lug plate 15 and the work station connecting plate 1 when tightening, the clamping force is appropriate to slightly reduce the gap, then the first nut 14 on the first bolt 13 is tightened, finally locked two clamping plate 3 in the middle of no visible gap, thermal barrier coating sample 28 in the clamping plate 3 can rotate in the plane, no displacement in other directions, no shaking when the whole device is forced to move.

[0057] By reasonably arranging the assembly sequence of each component, the clamping method in the embodiment realizes that the thermal barrier coating sample 28 bears the minimum stress.

[0058] In step two, the combination of the fixture, the thermal barrier coating sample 28 and the work station connecting plate 1 is installed on the work station frame 23. Specifically, first, the third bolt 24 is assembled to the top plate 231 of the work station frame 23, and the pair of third lower nuts 26 cooperating with the lower part of the third bolt 24 is tightened, so that the third bolt 24 is fixed on the work station frame 23, then one third upper nut 25 is screwed into a certain depth from the upper part of each third bolt 24, used for bearing the combination in the foregoing step, then the two third bolts 24 are respectively passed through the fifth through hole 18 on the left and right sides of the work station connecting plate 1, so that the combination is placed on the work station frame 23 by the third upper nut 25, and after adjusting the levelness and height of the combination by tightening the third upper nut 25, the other third upper nut 25 is screwed from the upper part of each third bolt 24, so as to abut against the upper part of the work station connecting plate 1, thereby fastening the combination on the work station frame 23 as a whole.

[0059] The principles and implementation modes of the present application are described in the specific examples in the specification, and the above examples are only used to help understand the method of the present application and its core idea; meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation mode and application range will be changed. In view of the above, the content of the specification should not be understood as a limitation of the present application.

Claims

1. A thermal barrier coating specimen holding device, characterized by, The utility model provides a work station connecting plate, elbow joint and clamp, the clamp includes first connecting mechanism, second connecting mechanism and two symmetrical clamping plates, each clamping plate is provided with flow channel groove near one side of another clamping plate, the flow channel groove penetrates the top, bottom and butt joint surface of clamping plate, each clamping plate front side near one side of another clamping plate is provided with a half hole, two clamping plates are connected through first connecting mechanism, two flow channel grooves form first flow channel after the butt joint of two clamping plates, and two half holes form positioning hole after the butt joint of two clamping plates, the positioning hole is used for positioning thermal barrier coating sample, the thermal barrier coating sample and clamping plate are linear contact, and the thermal barrier coating sample can move in positioning hole, second connecting mechanism is used for installing two clamping plates on the upper portion of work station connecting plate, the inside of work station connecting plate is provided with second flow channel, the bottom of first flow channel communicates with second flow channel, the elbow joint is arranged in the lower portion of work station connecting plate, and the elbow joint communicates with second flow channel, the inner wall of positioning hole is provided with annular protrusion, the annular protrusion is coated with thermal barrier coating, the side wall of thermal barrier coating sample is provided with annular recess, the annular protrusion is used for being arranged in annular recess, and the annular protrusion and annular recess are linear contact, the annular protrusion is annular wedge-shaped protrusion, the cross section of annular wedge-shaped protrusion is first isosceles triangle, the annular recess is annular wedge-shaped recess, the cross section of annular wedge-shaped recess is second isosceles triangle, and the top angle of first isosceles triangle is less than the top angle of second isosceles triangle.

2. The thermal barrier coating coupon holding device of claim 1, wherein, The front side and rear side of the upper portion of each clamping plate are respectively provided with a front lug and a rear lug, the first connecting mechanism includes two first connecting assemblies, one first connecting assembly is used for connecting two front lugs, and the other first connecting assembly is used for connecting two rear lugs; the first connecting assembly includes a first bolt and two first nuts, the front lug is provided with a first through hole through which the first bolt passes, the rear lug is provided with a second through hole through which the first bolt passes, the first bolt is used for passing through two first through holes or two second through holes, and the two first nuts are used for being respectively installed at two ends of the first bolt.

3. The thermal barrier coating coupon holding device of claim 1, wherein, The bottom of each clamping plate near one side of another clamping plate is provided with a protrusion, two protrusions form a positioning block after the butt joint of two clamping plates, the top of the work station connecting plate is provided with a positioning groove matched with the structure of the positioning block, and the positioning block can be clamped in the positioning groove.

4. The thermal barrier coating coupon holding device of claim 1, wherein, The side of each clamping plate away from another clamping plate is provided with a connecting lug, the second connecting mechanism includes two second connecting assemblies, and each second connecting assembly is used for installing one connecting lug on the work station connecting plate; the second connecting assembly includes a second bolt and two second nuts, each second bolt is used for sequentially passing through one connecting lug and the work station connecting plate, and the two second nuts are used for being respectively installed at two ends of the second bolt.

5. The TBC specimen holding device of claim 1, wherein, The back side of the thermal barrier coating sample is flush with the front side of the first flow channel in the clamping plate.

6. The thermal barrier coating specimen holding device of claim 1, wherein, The back side of one of the clamping plates is provided with a pressure monitoring component mounting hole, and the back side of the other clamping plate is provided with a temperature monitoring component mounting hole.

7. The TBC specimen holding device of claim 1, wherein The work station frame includes a top plate and a stand column arranged at the lower part of the top plate, and the third connecting mechanism includes two third connecting assemblies, each of which includes a third bolt, two third lower nuts and two third upper nuts.

8. A clamping method based on the thermal barrier coating specimen clamping device according to any one of claims 1 to 7, characterized by, The method comprises the following steps: Step one, butt joint the two clamping plates and clamp the thermal barrier coating sample in the positioning hole, and place the butt jointed two clamping plates on the upper part of the work station connecting plate; Step two, pre-tighten and install the two clamping plates on the work station connecting plate through the second connecting mechanism; Step three, pre-tighten and install the two clamping plates through the first connecting mechanism, then lock and fix the two clamping plates on the work station connecting plate through the second connecting mechanism, and finally lock and fix the two clamping plates through the first connecting mechanism.

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