A plasma sprayed coating bond strength test fixture

Abstract

The application discloses a plasma spraying coating bonding strength test clamp, which comprises a supporting seat, a pulling assembly is arranged on the top of the supporting seat, a cavity is arranged in the supporting seat, two rotating shafts are rotatably connected in the cavity, gears are fixedly connected to the outer sides of the rotating shafts, a plurality of slide holes, which are in communication with the cavity, are arranged on the top of the supporting seat, a connecting block is slidably connected in the slide hole, the bottom end of the connecting block is fixedly connected with a rack plate, a fixing assembly is arranged on the top of the connecting block, four sides of a test sample are clamped and fixed, and four positions on the top of the test sample are clamped and fixed, so that stable clamping of the test sample is realized, and uneven stress of the test sample is avoided; the spacing between the two fixing assemblies is adjustable, and the height of the limiting plate is adjustable, so that clamping and fixing of test samples with different sizes are facilitated.

Description

Technical Field

[0001] This application relates to the field of test fixture technology, and more specifically, to a test fixture for the bonding strength of plasma sprayed coatings. Background Technology

[0002] In modern industrial manufacturing and equipment maintenance, plasma spraying technology is widely used in aerospace, machining, energy, and chemical industries because it can form coatings with excellent properties such as high hardness, wear resistance, corrosion resistance, and high temperature resistance on the surfaces of substrates such as metals and ceramics. For example, plasma-sprayed ceramic coatings can significantly improve the high-temperature resistance of aero-engine blades and extend their service life; in petrochemical equipment, spraying corrosion-resistant coatings can effectively resist media erosion and ensure the safe and stable operation of the equipment.

[0003] However, the bonding strength between the coating and the substrate directly determines the coating's service life and reliability under actual operating conditions. Insufficient bonding strength can lead to peeling, cracking, and other problems during use, resulting in decreased equipment performance or even failure. Therefore, accurately testing the bonding strength of plasma-sprayed coatings is crucial for evaluating coating quality, optimizing spraying process parameters, and ensuring product performance.

[0004] Currently, existing coating adhesion strength testing fixtures have many problems in practical applications. Some fixtures have unreasonable structural designs, making it difficult to ensure stable clamping of the sample during testing. This can easily lead to uneven stress on the sample, resulting in large errors in the test results and failing to accurately reflect the coating adhesion strength. Furthermore, most fixtures have poor versatility, only suitable for samples of specific sizes, and cannot adapt to testing requirements of different specifications.

[0005] To address the aforementioned issues, this application provides a plasmonic fixture for testing the bonding strength of plasma-sprayed coatings. Utility Model Content

[0006] One objective of this application is to provide a plasma spray coating bonding strength testing fixture, comprising a support base, a pull-out assembly at the top of the support base, a cavity inside the support base, two rotating shafts rotatably connected inside the cavity, gears fixedly connected to the outer sides of the rotating shafts, multiple rack plates slidably connected inside the cavity, two of the rack plates being fixedly connected to fixing blocks on their outer sides, an electric push rod fixedly connected to the inner wall of the cavity, the output end of the electric push rod being fixedly connected to the fixing blocks, multiple sliding holes communicating with the cavity at the top of the support base, connecting blocks slidably connected inside the sliding holes, the bottom end of the connecting blocks being fixedly connected to the rack plates, and a fixing assembly at the top of the connecting blocks.

[0007] Furthermore, the pull-out assembly includes a fixed frame fixedly connected to the top of the support base. The fixed frame is arranged in an "L" shape. A piston cylinder is fixedly connected to the top of the fixed frame. The piston rod end of the piston cylinder passes through the inner cavity of the fixed frame and is fixedly connected to a pull-out test head.

[0008] Furthermore, the two gears are arranged vertically, and the two opposing rack plates are meshed and connected to the gears for transmission. Multiple slide rods are fixedly connected inside the cavity, and the rack plates are slidably sleeved on the outside of the slide rods.

[0009] Furthermore, the inner wall of the cavity is symmetrically fixedly connected with fixed plates, and a fixed tube is fixedly connected between the two fixed plates. Circular grooves are opened in the middle of the upper and lower sides of the inner wall of the cavity. The opposite ends of the two rotating shafts are respectively rotatably connected to the inside of the two circular grooves, and the opposite ends of the two rotating shafts are rotatably connected to the inside of the fixed tube.

[0010] Furthermore, both the circular groove and the inner wall of the fixed tube are provided with annular grooves, and a matching annular block is rotatably connected inside the annular groove. The inner wall of the annular block is fixedly connected to the outer wall of the rotating shaft.

[0011] Furthermore, the fixing component includes a rectangular block, a sliding groove is provided on the outer side of the rectangular block, a lead screw is rotatably connected to the inner bottom wall of the sliding groove, a limiting plate is slidably connected inside the sliding groove, and the limiting plate is threaded onto the outer side of the lead screw, the top end of the lead screw extends to the top of the rectangular block, and a rotating handle is fixedly connected to the top end of the lead screw.

[0012] Furthermore, the inner wall of the sliding hole is symmetrically provided with sliding grooves, and a slider is slidably connected inside the sliding groove. The slider is fixedly connected to the outer side of the connecting block.

[0013] The beneficial effects of this application are:

[0014] The sample is placed on top of the support base. Controlling the retraction of two electric push rods causes the two opposing rack plates to move relative to each other. This movement, in turn, moves the connecting block fixedly connected to the rack plates. The moving connecting block then moves the rectangular block, thus clamping and fixing the rectangular sample on all four sides. Turning the handle rotates the lead screw, which in turn drives the limiting plate to slide downwards on the outside of the rectangular block. The limiting plate slides downwards and presses against the top of the sample, thus fixing the top of the sample. This clamping and fixing of the sample on all four sides and at four positions on the top ensures stable clamping and prevents uneven stress on the sample. Furthermore, the distance between the two opposing fixing components and the height of the limiting plate are adjustable, facilitating the clamping and fixing of sample samples of different sizes. Attached Figure Description

[0015] The accompanying drawings are provided to further understand this application and form part of the specification. They are used together with the embodiments of this application to explain this application and do not constitute a limitation thereof.

[0016] In the attached diagram:

[0017] Figure 1 This is a schematic diagram of the overall structure of this application;

[0018] Figure 2 This is a partial structural diagram of this application;

[0019] Figure 3 For the purposes of this application Figure 2 Sectional view;

[0020] Figure 4 This is a sectional view of the support base in this application;

[0021] Figure 5 For the purposes of this application Figure 1 Enlarged schematic diagram of the structure of region A in the middle.

[0022] Explanation of the labels in the diagram:

[0023] 1. Support base; 2. Fixing frame; 3. Piston cylinder; 4. Pull-out test head; 5. Sliding hole; 6. Sliding groove; 7. Cavity; 8. Electric push rod; 9. Fixing block; 10. Rack plate; 11. Sliding rod; 12. Sliding block; 13. Connecting block; 14. Gear; 15. Rotating shaft; 16. Annular block; 17. Fixing plate; 18. Fixing tube; 19. Rectangular block; 20. Limiting plate; 21. Sliding groove; 22. Lead screw; 23. Rotating handle; 24. Annular groove. Detailed Implementation

[0024] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0025] In the description of this application, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0027] Example:

[0028] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4 This application discloses a plasma spray coating bonding strength testing fixture, including a support base 1. A pull-out assembly is provided on the top of the support base 1. A cavity 7 is formed inside the support base 1. Two rotating shafts 15 are rotatably connected inside the cavity 7. Gears 14 are fixedly connected to the outer sides of the rotating shafts 15. Multiple rack plates 10 are slidably connected inside the cavity 7. Fixing blocks 9 are fixedly connected to the outer sides of two rack plates 10. Electric push rods 8 are fixedly connected to the inner wall of the cavity 7. The output end of the electric push rods 8 is fixedly connected to the fixing blocks 9. Controlling the retraction of the two electric push rods 8 causes the rack plates 10 fixedly connected to the fixing blocks 9 to move, thereby driving the gears 14 to rotate. Rotation drives another rack plate 10 to move, thereby causing the two rack plates 10 to move relative to each other, which in turn drives the connecting block 13 fixedly connected to the rack plate 10 to move. The movement of the connecting block 13 drives the rectangular block 19 to move, thereby clamping and fixing the test sample with a rectangular structure on all four sides. The top of the support base 1 has multiple sliding holes 5 that communicate with the cavity 7. The connecting block 13 is slidably connected inside the sliding holes 5. The length of the connecting block 13 fixedly connected to the two rack plates 10 near the lower side of the support base 1 is greater than the length of the connecting block 13 fixedly connected to the two rack plates 10 near the upper side of the support base 1. The bottom end of the connecting block 13 is fixedly connected to the rack plate 10, and the top of the connecting block 13 is provided with a fixing component.

[0029] Please see Figure 1 The pull-out assembly includes a fixed frame 2 fixedly connected to the top of the support base 1. The fixed frame 2 is arranged in an "L" shape. A piston cylinder 3 is fixedly connected to the top of the fixed frame 2. An electronic digital display pressure gauge (not shown in the figure) is also installed on the piston cylinder 3 to record the maximum pressure value when the pull-out test head 4 is pulled out during the pull-out process. The piston rod end of the piston cylinder 3 passes through the inner cavity of the fixed frame 2 and is fixedly connected to the pull-out test head 4.

[0030] During testing, the staff evenly applied adhesive to the bottom of the pull-out test head 4, and then drove the piston cylinder 3. The piston cylinder 3 drove the piston rod to extend downward, so that the pull-out test head 4 pressed onto the test sample. After the adhesive fixed the test sample to the pull-out test head 4, the pull-out test could begin. Under the action of the piston cylinder 3, the piston rod drove the pull-out test head 4 to pull upward, thereby applying an upward pulling force to the test sample. Once the adhesive coating of the pull-out test head 4 detached from the substrate surface, the pressure gauge recorded the maximum pressure measured and displayed it on the dial. After calculation, the tensile strength data of the test sample was obtained.

[0031] Please see Figure 2 Two gears 14 are arranged vertically, and two opposing rack plates 10 are meshed and connected to the gears 14 for transmission. Multiple slide rods 11 are fixedly connected inside the cavity 7. The slide rods 11 are rectangular in shape. The rack plates 10 are slidably sleeved on the outside of the slide rods 11. The two ends of the slide rods 11 are fixedly connected to the inner wall of the cavity 7. The slide rods 11 limit the sliding movement of the rack plates 10. When the gears 14 rotate, the gears 14 drive the rack plates 10 to slide on the outside of the slide rods 11, which improves the stability of the rack plates 10 when they move.

[0032] Please see Figure 2 , Figure 3 and Figure 4 A fixed plate 17 is symmetrically fixedly connected to the inner wall of the cavity 7. A fixed tube 18 is fixedly connected between the two fixed plates 17. The opposite ends of the two fixed plates 17 are fixedly connected to the inner wall of the cavity 7. Circular grooves are opened in the middle of the upper and lower sides of the inner wall of the cavity 7. The opposite ends of the two rotating shafts 15 are rotatably connected to the inside of the two circular grooves. The opposite ends of the two rotating shafts 15 are rotatably connected to the inside of the fixed tube 18. Circular grooves 24 are opened in the inner walls of the circular grooves and the fixed tube 18. Matching annular blocks 16 are rotatably connected inside the annular grooves 24. The rotating shafts 15 are rotatably connected to the fixed tube 18 and the circular grooves through the cooperation of the annular blocks 16 and the annular grooves 24. When the rotating shafts 15 rotate, the rotating shafts 15 drive the two annular blocks 16 on their outer side to rotate inside the annular grooves 24, improving the stability of the rotating shafts 15 during rotation. The inner wall of the annular blocks 16 is fixedly connected to the outer wall of the rotating shafts 15.

[0033] Please see Figure 5, The fixing component includes a rectangular block 19. The two sides of the bottom end surface of the rectangular block 19 are slidably connected to the top of the support base 1. The bottom end surface of the rectangular block 19 is fixedly connected to the top end surface of the connecting block 13. A sliding groove 21 is formed on the outer side of the rectangular block 19. The sliding groove 21 is arranged in a structure of the Chinese character "ri" (day). A screw rod 22 is rotatably connected to the inner bottom wall of the sliding groove 21. A limiting plate 20 is slidably connected to the inside of the sliding groove 21, and the limiting plate 20 is threadedly sleeved on the outer side of the screw rod 22. The top end of the screw rod 22 extends above the rectangular block 19, and a rotating handle 23 is fixedly connected to the top end of the screw rod 22. Rotating the rotating handle 23 drives the screw rod 22 to rotate. The rotation of the screw rod 22 drives the limiting plate 20 to slide downward on the outer side of the rectangular block 19. The limiting plate 20 slides downward and presses against the top of the test sample, thereby realizing the fixation of the test sample. Symmetrically arranged sliding grooves 6 are formed on the inner wall of the sliding hole 5. A slider 12 is slidably connected to the inside of the sliding groove 6. The slider 12 is fixedly connected to the outer side of the connecting block 13. The cooperation between the slider 12 and the sliding groove 6 limits the sliding of the connecting block 13. When the rack plate 10 drives the connecting block 13 to move, the connecting block 13 drives the slider 12 to move inside the sliding groove 6, improving the stability of the fixing component during movement.

[0034] The implementation principle of the embodiment of this application is as follows: Place the test sample on the top of the support base 1. Control the two electric push rods 8 to work and contract, so that the rack plate 10 fixedly connected to the fixed block 9 moves, thereby driving the gear 14 to rotate. The rotation of the gear 14 drives the other rack plate 10 to move, so that the two rack plates 10 move relatively, and then带动 the connecting block 13 fixedly connected to the rack plate 10 to move. The movement of the connecting block 13带动 the rectangular block 19 to move, thereby clamping and fixing the four sides of the test sample arranged in a rectangular shape. Rotating the rotating handle 23 drives the screw rod 22 to rotate. The rotation of the screw rod 22 drives the limiting plate 20 to slide downward on the outer side of the rectangular block 19. The limiting plate 20 slides downward and presses against the top of the test sample, thereby realizing the fixation of the top of the test sample. In this way, by clamping and fixing the four sides of the test sample and clamping and fixing the four positions on the top of the test sample, the stable clamping of the test sample can be realized;

[0035] The distance between the two opposite fixing components is adjustable, and the height of the limiting plate 20 is adjustable, facilitating the clamping and fixing of test samples of different sizes;

[0036] During testing, the staff evenly applied adhesive to the bottom of the pull-out test head 4, and then drove the piston cylinder 3. The piston cylinder 3 drove the piston rod to extend downward, so that the pull-out test head 4 pressed onto the test sample. After the adhesive fixed the test sample to the pull-out test head 4, the pull-out test could begin. Under the action of the piston cylinder 3, the piston rod of the piston cylinder 3 drove the pull-out test head 4 to pull upward, thereby applying an upward pulling force to the test sample. Once the coating of the pull-out test head 4 detached from the substrate surface, the pressure gauge recorded the maximum pressure measured and displayed it on the dial. After calculation, the tensile strength data of the test sample was obtained.

[0037] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this application, based on the technical solution and application concept of this application, should be included within the scope of protection of this application.

Claims

1. A plasmonic fixture for testing the bonding strength of plasma-sprayed coatings, comprising a support base (1), characterized in that: The top of the support base (1) is provided with a pull-out assembly. The support base (1) has a cavity (7) inside. Two rotating shafts (15) are rotatably connected inside the cavity (7). Gears (14) are fixedly connected to the outer side of the rotating shafts (15). Multiple rack plates (10) are slidably connected inside the cavity (7). Fixing blocks (9) are fixedly connected to the outer side of two rack plates (10). An electric push rod (8) is fixedly connected to the inner wall of the cavity (7). The output end of the electric push rod (8) is fixedly connected to the fixing block (9). The top of the support base (1) has multiple sliding holes (5) that communicate with the cavity (7). A connecting block (13) is slidably connected inside the sliding hole (5). The bottom end of the connecting block (13) is fixedly connected to the rack plate (10). A fixing assembly is provided on the top of the connecting block (13).

2. The plasma spray coating bonding strength testing fixture according to claim 1, characterized in that: The pull-out assembly includes a fixed frame (2) fixedly connected to the top of the support base (1). The fixed frame (2) is arranged in an "L" shape. A piston cylinder (3) is fixedly connected to the top of the fixed frame (2). The piston rod end of the piston cylinder (3) passes through the inner cavity of the fixed frame (2) and is fixedly connected to a pull-out test head (4).

3. The plasma spray coating bonding strength testing fixture according to claim 1, characterized in that: Two gears (14) are arranged one above the other, and two rack plates (10) are meshed and connected to the gears (14) for transmission. Multiple slide rods (11) are fixedly connected inside the cavity (7), and the rack plate (10) is slidably sleeved on the outside of the slide rod (11).

4. A plasma spray coating bonding strength testing fixture according to claim 1, characterized in that: The inner wall of the cavity (7) is symmetrically fixedly connected with fixing plates (17), and a fixing tube (18) is fixedly connected between the two fixing plates (17). Circular grooves are opened in the middle of the upper and lower sides of the inner wall of the cavity (7). The opposite ends of the two rotating shafts (15) are respectively rotatably connected to the inside of the two circular grooves, and the opposite ends of the two rotating shafts (15) are rotatably connected to the inside of the fixing tube (18).

5. A plasma spray coating bonding strength testing fixture according to claim 4, characterized in that: The inner walls of the circular groove and the fixed tube (18) are provided with annular grooves (24). The annular groove (24) is rotatably connected to a matching annular block (16). The inner wall of the annular block (16) is fixedly connected to the outer wall of the rotating shaft (15).

6. A plasma spray coating bonding strength testing fixture according to claim 1, characterized in that: The fixing component includes a rectangular block (19), a sliding groove (21) is provided on the outer side of the rectangular block (19), a lead screw (22) is rotatably connected to the inner bottom wall of the sliding groove (21), a limiting plate (20) is slidably connected inside the sliding groove (21), and the limiting plate (20) is threaded onto the outer side of the lead screw (22), the top end of the lead screw (22) extends above the rectangular block (19), and a rotating handle (23) is fixedly connected to the top end of the lead screw (22).

7. A plasma spray coating bonding strength testing fixture according to claim 1, characterized in that: The inner wall of the sliding hole (5) is symmetrically provided with sliding grooves (6), and a slider (12) is slidably connected inside the sliding groove (6). The slider (12) is fixedly connected to the outer side of the connecting block (13).

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