Punching-sliding composite fretting corrosion testing machine suitable for high-temperature lead-bismuth environment

Abstract

The invention discloses a punching-sliding composite fretting corrosion testing machine suitable for a high-temperature lead-bismuth environment, and the punching-sliding composite fretting corrosion testing machine comprises a test bed, a lead-bismuth pipeline, a test kettle, a melting kettle, an excitation system and a gas circuit control system, the lead-bismuth pipeline is communicated with the bottoms of the test kettle and the melting kettle, and a clamping assembly is arranged in the test kettle; the vibration excitation system comprises a signal generator, a first power amplifier, a second power amplifier, a first vibration exciter, a second vibration exciter and a vibration excitation clamp; the clamping assembly comprises an upper supporting disc, a plate sample clamp, a pipe sample, a pipe sample clamp, a cantilever rod, a cantilever rod clamp, a lower supporting disc, a rotating block and a movable pin shaft. By adopting the impact-slip composite micro-motion corrosion testing machine suitable for the high-temperature lead-bismuth environment, the problems that the micro-motion corrosion test in an impact-slip composite motion mode in the lead-bismuth environment is difficult to carry out by the existing experimental equipment and the micro-motion corrosion behavior cannot be fully researched are solved.

Description

Technical Field

[0001] The invention relates to the technical field of micro-motion testing in a high-temperature lead-bismuth environment, and in particular to an impact-sliding composite micro-motion corrosion testing machine suitable for use in a high-temperature lead-bismuth environment. Background Art

[0002] Lead-cooled fast reactors are one of the important candidate reactor types in the new generation of nuclear energy systems. They use lead or lead-bismuth alloy as coolant. They have high density, good thermal conductivity and a wide operating temperature range, which can effectively improve the efficiency and safety of the reactor. However, the strong corrosiveness of lead-bismuth coolants poses a severe challenge to structural materials. Under high temperature and high flow rate conditions, the chemical reaction between the coolant and the structural material will cause dissolution and corrosion on the metal surface, affecting the integrity and durability of the structural material. At the same time, the flow of lead-bismuth coolant causes micro-motion wear between some components and supports. This type of wear usually produces a small relative movement on the contact surface, with small damage characteristics and strong destructive power, which seriously threatens the safe operation of nuclear power. This wear is further accelerated on the basis of lead-bismuth corrosion, so that the material surface is not only subject to chemical corrosion, but also to the superposition of physical wear. The design and use of lead-cooled fast reactors need to comprehensively consider the dual factors of corrosion and wear to ensure the long-term stable operation of the system and extend the service life of the material. Therefore, it is of great significance to the development of lead-cooled fast reactors to study the interactive mechanism of lead-bismuth corrosion and micro-motion wear and develop materials and protective measures that can cope with this complex environment.

[0003] At present, the experimental methods used for parts prone to fretting wear and fretting corrosion in nuclear reactors at home and abroad mainly focus on the wear mode of tangential slip, and the research environment is mostly for water environment or air environment. However, the composite motion of impact and slip in actual working conditions shows a certain randomness in direction and speed, making it difficult for existing equipment to effectively simulate the fretting wear and corrosion behavior in the real lead-bismuth environment. In order to meet the above experimental needs, it is urgent to develop a high-temperature fretting corrosion experimental device with a random impact and slip mode. Summary of the invention

[0004] The purpose of the present invention is to provide an impact-slip composite fretting corrosion testing machine suitable for a high-temperature lead-bismuth environment, so as to solve the problem that the existing experimental equipment is difficult to carry out fretting corrosion tests in an impact-slip composite motion mode in a lead-bismuth environment, and is unable to fully study the fretting corrosion behavior.

[0005] To achieve the above-mentioned purpose, the present invention provides a composite fretting corrosion tester for high-temperature lead-bismuth environment, including a test bench, a lead-bismuth pipeline, a test kettle, a melting kettle, an excitation system, and a gas control system. The lead-bismuth pipeline, the test kettle, the melting kettle, the excitation system, and the gas control system are respectively located on the test bench, the lead-bismuth pipeline is located at the bottom of the test bench, and is respectively connected to the bottom of the test kettle and the melting kettle. A clamping assembly is provided inside the test kettle, and four large shafts are welded on the outside of the test kettle at 90° intervals. Sleeves, the four large sleeves are respectively provided with four bellows pull rods A, B, C, and D at one end away from the test kettle, the bellows pull rods each include a pull rod sleeve, a bellows and a pull rod, the excitation system includes a signal generator, a power amplifier 1, a power amplifier 2, an exciter 1, an exciter 2, and an excitation fixture, the exciter 1 and the exciter 2 are both equipped with an excitation rod, the clamping assembly includes an upper support plate, a plate sample fixture, a tube sample, a tube sample fixture, a cantilever rod, a cantilever rod fixture, a lower support plate, a rotating block, and a movable pin.

[0006] Preferably, the bellows is installed in the tie rod sleeve, the tie rod passes through the bellows, one end of the bellows is welded to the inner end surface of the tie rod sleeve, and the other end is welded to the tie rod, a brass gasket is installed between the tie rod sleeve and the large sleeve, and the tie rod sleeve and the large sleeve are tightly connected with bolts.

[0007] Preferably, two adjacent bellows rods A and B are provided with a small sleeve at the end away from the test kettle, and a displacement sensor is installed inside the small sleeve. Two adjacent bellows rods C and D are provided with an exciter end bearing accessory, a force sensor, and a connecting frame in sequence at the end away from the test kettle. A long hole is provided at the center of the end of the connecting frame away from the force sensor, and the connecting frame is connected to the excitation rods on the exciter one and the exciter two respectively through the long hole.

[0008] Preferably, the outer wall of the test kettle is provided with a test kettle heating and insulation layer, the test kettle heating and insulation layer is embedded with a resistance wire, and the outer side of the melting kettle is provided with a melting kettle heating and insulation layer.

[0009] Preferably, six bolt holes are distributed on the inner diameter wall surface of the lower support plate, and the lower support plate is fixed to the bottom of the test kettle by bolts passing through the bolt holes.

[0010] Preferably, the cantilever rod fixture is installed in the middle of the lower support plate, a threaded hole is arranged at the center of the cantilever rod fixture, and the cantilever rod is threadedly connected to the cantilever rod fixture through the threaded hole.

[0011] Preferably, a threaded hole is provided in the middle of the cantilever rod, and through holes are provided in the center of the tube sample fixture and the tube sample. The tube sample fixture is built into the tube sample, coaxially matched with the cantilever rod, and fixed to the cantilever rod through the threaded hole using a cylindrical head screw.

[0012] Preferably, the upper support plate structure is the same as the lower support plate structure and is fixed at the middle position of the test kettle by bolts.

[0013] Preferably, the plate sample fixture is U-shaped as a whole, including a rotating block, a plate sample fixture, and a plate sample. Pin holes are provided on both sides of the middle of the plate sample fixture. The rotating block is connected to the plate sample fixture through a movable pin, and the plate sample is installed on the rotating block of the plate sample fixture.

[0014] Preferably, the excitation fixture is installed at the upper end of the cantilever rod, and slots are provided on both sides of the excitation fixture. One end of the pull rod in the bellows pull rod is connected to the excitation fixture through a high-temperature bearing assembly. The signal of the signal generator is transmitted to exciter one and exciter two respectively via power amplifier one and power amplifier two.

[0015] The advantages and beneficial effects of the present invention using the above-mentioned impact-sliding composite fretting corrosion testing machine suitable for high-temperature lead-bismuth environment are: 1. The present invention uses an exciter as a power source and designs a tube and plate sample clamping assembly that can perform impact-sliding composite motion. The cantilever rod and the surrounding components are independent of each other, which improves the flexibility of the clamping assembly and the accuracy of contact force and motion displacement measurement between the tube and plate samples.

[0016] 2. The present invention distributes two exciters vertically, and simultaneously applies mutually perpendicular forces to the cantilever rod to cause the cantilever rod to undergo impact-sliding composite motion, and ensures that the composite motion has certain random characteristics in the motion direction and motion speed. A high-temperature bearing assembly is installed at the end of the bellows pull rod connected to the displacement sensor, and the high-temperature bearing assembly is fitted with the excitation fixture to achieve displacement decomposition of the composite motion in the horizontal and vertical directions.

[0017] 3. The test system of the present invention is composed of a test kettle, a heating and thermal insulation layer, a bellows pull rod and other parts. The bellows pull rod is rigidly connected to the exciter to reduce motion errors. The lead-bismuth pipeline controls the transmission of the lead-bismuth alloy. The heating and thermal insulation layers of the test kettle and the melting kettle can provide heating, thermal insulation and related temperature control at the same time.

[0018] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of a punch-slide composite fretting corrosion tester suitable for use in a high-temperature lead-bismuth environment according to the present invention; Figure 2 It is a schematic diagram of a test kettle in a punch-slide composite fretting corrosion tester suitable for use in a high-temperature lead-bismuth environment; Figure 3It is a partial cross-sectional view of a test kettle in a punch-slide composite fretting corrosion tester suitable for use in a high-temperature lead-bismuth environment; Figure 4 It is a schematic diagram of the combination of a clamping assembly and an exciter in a punch-slide composite fretting corrosion tester suitable for use in a high-temperature lead-bismuth environment; Figure 5 It is a schematic diagram of a clamping assembly in a punch-slide composite fretting corrosion tester suitable for use in a high-temperature lead-bismuth environment; Figure 6 The invention discloses an exploded diagram of a tube specimen and a tube specimen fixture used in a punch-slide composite fretting corrosion testing machine in a high-temperature lead-bismuth environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 1. Test bench; 2. Lead-bismuth pipeline; 3. Melting kettle; 4. Signal generator; 5. Power amplifier 1; 6. Vibrator 2; 7. Power amplifier 2; 8. Air circuit control system; 9. Vibrator 1; 10. Test kettle; 11. Connection frame; 12. Vibrator end bearing accessories; 13. Bellows pull rod A; 14. Displacement sensor; 15. Small shaft sleeve; 16. Large shaft sleeve; 17. Force sensor; 18. Brass gasket; 19. Pull rod sleeve; 20. Bellows bellows; 21. tie rod; 22. test kettle heating insulation layer; 23. exciting rod; 24. clamping assembly; 25. high-temperature bearing assembly; 26. cantilever rod; 27. exciting fixture; 28. rotating block; 29. ​​movable pin; 30. plate specimen fixture; 31. cantilever rod fixture; 32. tube specimen; 33. tube specimen fixture; 34. upper support plate; 35. lower support plate; 36. bellows tie rod B; 37. bellows tie rod C; 38. bellows tie rod D. DETAILED DESCRIPTION

[0021] The technical solution of the present invention is further described below through the accompanying drawings and embodiments.

[0022] Unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0023] Example 1 like Figure 1 As shown, a composite fretting corrosion tester for impact and sliding in a high-temperature lead-bismuth environment includes a test bench 1, a lead-bismuth pipeline 2, a test kettle 10, a melting kettle 3, an excitation system, and a gas circuit control system 8. The lead-bismuth pipeline 2, the test kettle 10, the melting kettle 3, the excitation system, and the gas circuit control system 8 are respectively located on the test bench 1. The outer wall of the test kettle 10 is provided with a test kettle heating and insulation layer 22, and a resistance wire is embedded in the test kettle heating and insulation layer 22, and a melting kettle 3 heating and insulation layer is provided on the outer side of the melting kettle 3.

[0024] The lead-bismuth pipeline 2 is located at the bottom of the test bench 1 and is connected to the bottom of the test kettle 10 and the melting kettle 3 respectively. The lead-bismuth pipeline 2 is wrapped with a heating resistance wire to provide heating, insulation and related temperature control. Figure 2 As shown, four large shaft sleeves 16 are welded at 90° intervals on the outside of the test kettle 10, and the bellows tie rod A 13, bellows tie rod B 36, bellows tie rod C 37, and bellows tie rod D 38 are bolted to the four large shaft sleeves 16 respectively. The large shaft sleeves 16 can pass cooling water to provide temperature reduction protection for the bellows tie rods. Figure 3 As shown, the bellows tie rod includes a tie rod sleeve 19, a bellows 20 and a tie rod 21. The bellows 20 is installed in the tie rod sleeve 19, and the tie rod 21 passes through the bellows 20. One end of the bellows 20 is welded to the inner end surface of the tie rod sleeve 19, and the other end is welded to the tie rod 21. A brass gasket 18 is installed between the tie rod sleeve 19 and the large sleeve 16, and the tie rod sleeve 19 and the large sleeve 16 are tightly connected with bolts.

[0025] Two adjacent bellows tie rods A 13 and bellows tie rods B 36 that are not directly connected to the vibrator are provided with small sleeves 15 at the ends away from the test kettle 10. The other two adjacent bellows tie rods C 37 and bellows tie rods D 38 are provided with vibrator end bearing accessories 12, force sensors 17, and connecting frames 11 at the ends away from the test kettle 10. A displacement sensor 14 is installed inside the small sleeve 15. The end of the vibrator end bearing accessory 12 away from the bellows tie rod is provided with a force sensor 17. The end of the force sensor 17 away from the vibrator end bearing accessory 12 is provided with a connecting frame 11. A long hole is provided at the center of the end of the connecting frame 11 away from the force sensor 17. The connecting frame 11 is connected to the excitation rods 23 on the vibrator 1 9 and the vibrator 2 6 through the long hole. The vibrator 1 9 and the vibrator 2 6 are fixed on the base, and the installation height ensures that the excitation rod 23 can be bolted to the connecting frame 11 in a horizontal state.

[0026] When the test kettle 10 is heated, the connection between the connecting frame 11 and the vibrator 1 9 and the vibrator 2 6 is loosened to provide space for the thermal deformation of the test kettle 10; when the temperature stabilizes, the connecting frame 11 is connected to the vibrator 1 9 and the vibrator 2 6 for subsequent tests; when the temperature drops, the connection between the connecting frame 11 and the vibrator 1 9 and the vibrator 2 6 is loosened again to provide deformation space for the cooling and contraction of the test kettle 10, thereby preventing the thermal expansion and contraction of the test kettle 10 from causing excessive tension and pressure on the vibrator 1 9 and the vibrator 2 6.

[0027] like Figure 4 and Figure 5 As shown, the test kettle 10 is provided with a clamping assembly 24 inside, and the clamping assembly 24 includes an upper support plate 34, a plate sample fixture 30, a tube sample 32, a tube sample fixture 33, a cantilever rod 26, a cantilever rod fixture 31, a lower support plate 35, a rotating block 28, and a movable pin 29. Six bolt holes are distributed on the inner diameter wall surface of the lower support plate 35, and the lower support plate 35 is fixed to the bottom of the test kettle 10 through bolts through the bolt holes. The cantilever rod fixture 31 is installed in the middle of the lower support plate 35, and a threaded hole is set at the center of the cantilever rod fixture 31. The cantilever rod 26 is threadedly connected to the cantilever rod fixture 31 through the threaded hole. Figure 6 As shown, a threaded hole is provided in the middle of the cantilever rod 26, and through holes are provided in the centers of the tube sample fixture 33 and the tube sample 32. The tube sample fixture 33 is built into the tube sample 32, and is coaxially matched with the cantilever rod 26. The cantilever rod 26 is fixed to the cantilever rod 26 through the threaded hole using a cylindrical head screw. The upper support plate 34 has the same structure as the lower support plate 35, and is fixed to the middle position of the test kettle 10 using bolts. The plate sample fixture 30 is U-shaped as a whole, including a rotating block 28, a plate sample fixture, and a plate sample. Pin holes are provided on both sides of the middle of the plate sample fixture. The rotating block 28 is connected to the plate sample fixture through a movable pin 29. The plate sample is installed on the rotating block 28 of the plate sample fixture 30, and is kept at the same height as the tube sample 32, so that the plate sample and the tube sample 32 can be in line contact.

[0028] The excitation system includes a signal generator 4, a power amplifier 1 5, a power amplifier 2 7, an exciter 1 9, an exciter 2 6, and an excitation fixture 27. Exciter 1 9 and exciter 2 6 are both provided with an excitation rod 23 inside. Figure 5As shown, the excitation fixture 27 is installed at the upper end of the cantilever rod 26, and the excitation fixture 27 is provided with a slot corresponding to the side of the exciter 1 9 and the exciter 2 6. The two bellows tie rods 13 near the side of the exciter 1 9 and the exciter 2 6 are respectively inserted into the slots of the excitation fixture 27 for connection. The bellows tie rod A 13 connected to the small shaft sleeve 15 and one end of the tie rod 21 in the bellows tie rod B are connected to the excitation fixture 27 through the high-temperature bearing assembly 25. The high-temperature bearing assembly 25 is installed at the end of the tie rod 21 in the bellows tie rod A and the bellows tie rod B (this end is located in the test kettle 10), and the end passes through the side wall of the test kettle 10 and is connected to the side of the excitation fixture 27. The side of the excitation fixture 27 is divided into a flat surface and a slot surface, and the high-temperature bearing assembly 25 is tightly fitted with the flat surface of the excitation fixture 27.

[0029] One end of the tie rod 21 in the bellows tie rod A 13, the bellows tie rod B 36, the bellows tie rod C 37, and the bellows tie rod D 38 is located inside the test kettle, and the other end is located outside the test kettle.

[0030] When the vibration exciter 1 9 and the vibration exciter 2 6 move, they transmit two vertical forces to the cantilever rod 26, thereby driving the tube sample 32 on the cantilever rod 26 to perform impact-slip composite motion. The signal of the signal generator 4 is transmitted to the vibration exciter 1 9 and the vibration exciter 2 6 via the power amplifier 1 5 and the power amplifier 2 7 respectively.

[0031] The signal generator outputs a specific excitation signal, which is amplified by the power amplifier and then input into the exciter to realize the exciter transmitting different forms of excitation. When conducting the micro-motion wear and corrosion experiment, the connection frame 11 needs to be bolted to the exciter first, and a force sensor is installed between the connection frame 11 and the bellows tie rod C 37 and the bellows tie rod D 38. The ends of the tie rod 21 of the bellows tie rod C 37 and the bellows tie rod D 38 close to the exciter are inserted into the slot of the excitation fixture 27. The bellows 20 on the tie rod 21 is kept in the maximum compression state to ensure that the tie rod 21 is in close contact with the excitation fixture 27. Since the experimental displacement is within the micro-motion range, the interference caused by the slight deformation of the bellows 20 on the accuracy of the force in the experiment can be ignored. When the exciter is working, the two vertical forces are respectively transmitted to the cantilever rod 26 through the tie rod 21, so that the cantilever rod 26 drives the tube sample 32 to produce a composite motion, and the contact process between the tube and the plate sample shows a composite motion mode of impact sliding. There are two rods 21 of the bellows rod A 13 and the bellows rod B 36 that are not connected to the exciter. One end of each rod 21 contacts the displacement sensor 14, and the other end is installed with a high-temperature bearing assembly 25. The high-temperature bearing assembly 25 fits the flat surface of the excitation fixture 27, and the bellows 20 on the rod 21 also maintains the maximum compression state. When the cantilever rod 26 undergoes a composite motion, the composite displacement is decomposed into mutually perpendicular displacement components through the two high-temperature bearing assemblies 25 and transmitted to the rod 21, and the displacement sensor 14 at the end detects and obtains the displacement change data in the experiment.

[0032] The above method can realize the impact-slip composite fretting corrosion experiment under 0-100N exciting force. The contact force and displacement changes during the experiment can be obtained by sensors and recorded in the computer for further analysis.

[0033] The test bench 1, the lead-bismuth pipeline 2, the test kettle 10, the melting kettle 3, and the gas circuit control system 8 all adopt existing technologies.

[0034] During the experiment, the fretting corrosion and wear tester needs to ensure that the internal friction of the tester itself remains stable, and the force sensor 17 measures the friction force during the friction of the sample. Table 1 shows the tangential internal friction data at room temperature and no load, and Table 2 shows the internal friction data at 350°C and no load. From the data in Tables 1-2, it can be seen that the difference between the original data and the average value is very small.

[0035] Table 1 Data of internal friction in the tangential direction at room temperature and without load

[0036] Table 2 Data of internal friction in the tangential direction at 350℃ without load

[0037] Therefore, the present invention adopts the above-mentioned impact-slip composite fretting corrosion testing machine suitable for high-temperature lead-bismuth environment to solve the problem that the existing experimental equipment is difficult to conduct fretting corrosion tests in the impact-slip composite motion mode and cannot fully study the fretting corrosion behavior in the lead-bismuth environment.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A composite fretting corrosion tester for high-temperature lead-bismuth environment, comprising a test bench, lead-bismuth pipelines, a test kettle, a melting kettle, an excitation system, and a gas circuit control system, characterized in that: The lead-bismuth pipeline, test kettle, melting kettle, excitation system, and air circuit control system are respectively located on the test bench. The lead-bismuth pipeline is located at the bottom of the test bench and is respectively connected to the bottom of the test kettle and the melting kettle. A clamping assembly is provided inside the test kettle. Four large shaft sleeves are welded on the outside of the test kettle at an interval of 90°. Four large shaft sleeves are respectively provided with four bellows pull rods A, B, C, and D at the ends away from the test kettle. The bellows pull rods each include a pull rod sleeve, a bellows, and a pull rod. The excitation system includes a signal generator, a power amplifier 1, a power amplifier 2, an exciter 1, an exciter 2, and an excitation fixture. The exciter 1 and the exciter 2 are both equipped with an excitation rod. The clamping assembly includes an upper support plate, a plate sample fixture, a tube sample, a tube sample fixture, a cantilever rod, a cantilever rod fixture, a lower support plate, a rotating block, and a movable pin.

2. The impact-sliding composite fretting corrosion testing machine suitable for high-temperature lead-bismuth environment according to claim 1 is characterized by: The bellows is installed in the tie rod sleeve, the tie rod passes through the bellows, one end of the bellows is welded to the inner end surface of the tie rod sleeve, and the other end is welded to the tie rod, a brass gasket is installed between the tie rod sleeve and the large sleeve, and the tie rod sleeve and the large sleeve are tightly connected with bolts.

3. The impact-sliding composite fretting corrosion testing machine suitable for high-temperature lead-bismuth environment according to claim 1 is characterized by: The ends of two adjacent bellows rods A and B away from the test kettle are each provided with a small sleeve, and a displacement sensor is installed inside the small sleeve; the ends of two adjacent bellows rods C and D away from the test kettle are respectively provided with an exciter end bearing accessory, a force sensor, and a connecting frame; a long hole is provided at the center of the end of the connecting frame away from the force sensor, and the connecting frame is connected to the excitation rods on the exciter one and the exciter two through the long hole.

4. The impact-sliding composite fretting corrosion testing machine suitable for high-temperature lead-bismuth environment according to claim 1 is characterized in that: The outer wall of the test kettle is provided with a test kettle heating and heat-insulating layer, the test kettle heating and heat-insulating layer is embedded with a resistance wire, and the outer side of the melting kettle is provided with a melting kettle heating and heat-insulating layer.

5. The impact-sliding composite fretting corrosion testing machine suitable for high-temperature lead-bismuth environment according to claim 1, characterized in that: Six bolt holes are distributed on the inner diameter wall surface of the lower support plate, and the lower support plate is fixed to the bottom of the test kettle by bolts through the bolt holes.

6. The impact-sliding composite fretting corrosion testing machine suitable for high-temperature lead-bismuth environment according to claim 1, characterized in that: The cantilever rod fixture is installed in the middle of the lower support plate. A threaded hole is arranged at the center of the cantilever rod fixture. The cantilever rod is threadedly connected to the cantilever rod fixture through the threaded hole.

7. The impact-sliding composite fretting corrosion testing machine suitable for high-temperature lead-bismuth environment according to claim 1 is characterized by: A threaded hole is provided in the middle of the cantilever rod, and through holes are provided in the center of the tube sample fixture and the tube sample. The tube sample fixture is built into the tube sample, matched with the cantilever rod coaxially, and fixed to the cantilever rod through the threaded hole using a cylindrical head screw.

8. The impact-sliding composite fretting corrosion testing machine suitable for high-temperature lead-bismuth environment according to claim 1 is characterized by: The upper support plate has the same structure as the lower support plate and is fixed at the middle of the test kettle by bolts.

9. The impact-sliding composite fretting corrosion testing machine suitable for high-temperature lead-bismuth environment according to claim 1, characterized in that: The plate sample fixture is U-shaped as a whole, including a rotating block, a plate sample fixture, and a plate sample. Pin holes are provided on both sides of the middle of the plate sample fixture. The rotating block is connected to the plate sample fixture through a movable pin, and the plate sample is installed on the rotating block of the plate sample fixture.

10. The impact-sliding composite fretting corrosion testing machine suitable for high-temperature lead-bismuth environment according to claim 1, characterized in that: The excitation fixture is installed at the upper end of the cantilever rod, and slots are provided on both sides of the excitation fixture. One end of the pull rod in the bellows pull rod is connected to the excitation fixture through a high-temperature bearing assembly. The signal of the signal generator is transmitted to exciter one and exciter two respectively through power amplifier one and power amplifier two.

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