High temperature piezoelectric ultrasonic probe assembly for pipeline corrosion detection

Abstract

The utility model provides a kind of high-temperature piezoelectric ultrasonic exploration assembly for pipeline corrosion detection, comprising: multiple probes and multiple wedge blocks, each probe includes probe body, fixed part and outlet, the probe body is fixedly connected with the wedge block by the fixed part, the outlet is arranged on the probe body, for the cable connection port of the probe;The probe body of each probe is pressed into backing block by high-temperature epoxy resin and powder in the probe body, and is bonded with piezoelectric material layer by high-temperature bonding process.The utility model is applied to the on-line detection of pressure pipeline under high-temperature operating conditions, with high corrosion detection efficiency, and good detection stability under 350 DEG C high-temperature conditions.The high-temperature piezoelectric ultrasonic exploration assembly provides an important basis for the development of pipeline rapid corrosion detection technology and high-temperature special probe.

Description

Technical Field

[0001] This utility model relates to the field of in-service inspection technology for nuclear power plants, and in particular to a high-temperature piezoelectric ultrasonic testing component for pipeline corrosion detection. Background Technology

[0002] In existing technologies, high-temperature piezoelectric materials are piezoelectric ceramic materials with high Curie temperature, high piezoelectric coefficient, high resistivity, and low dielectric loss, and can be used stably at relatively high temperatures. As the core sensing element of high-temperature piezoelectric sensors, high-temperature piezoelectric materials are widely used in aerospace, nuclear energy, metallurgy, petrochemical, geological exploration and other fields.

[0003] Currently, high-temperature piezoelectric ultrasonic testing methods primarily employ high-temperature piezoelectric ultrasonic probes. As temperature increases, the performance of ultrasonic transducers changes or they may fail. High-temperature ultrasonic transducers mainly require consideration of the temperature resistance of materials such as piezoelectric materials, matching materials, backing materials, circuit components, and wedge materials. In addition, the stability of the probe structure assembled from these materials must also be considered in high-temperature environments. The most common problem is the delamination of the piezoelectric crystal from the backing or wedge, which directly leads to a decrease in probe performance or failure.

[0004] The effects of high-temperature environments on ultrasonic probes are mainly as follows:

[0005] I. Polymer resin materials are commonly used as probe wedge materials. When the temperature changes, the ultrasonic velocity changes much faster in plexiglass than in steel, therefore the angle of the angle probe will change with temperature.

[0006] II. Piezoelectric materials are the core sound-generating materials in ultrasonic probes. When the temperature exceeds the Curie temperature Tc of the piezoelectric material, its piezoelectric properties fail. Generally, the coupling temperature between the probe and the workpiece being inspected is half the Curie temperature of the probe's piezoelectric material.

[0007] Third, the acoustic properties of different wafer materials vary greatly with temperature, especially for composite wafers where the adhesive softens at high temperatures, resulting in significant changes in acoustic properties.

[0008] Fourth, in the conventional probe manufacturing process, the chip and wedge, and the wedge and shell are generally bonded with glue during assembly. However, conventional glue softens at high temperatures, making the bonded parts easy to fall off and lose their original function.

[0009] Therefore, the design and manufacturing of ultrasonic probes for high-temperature applications should address key technical challenges in terms of both ultrasonic probe materials and manufacturing processes to meet the application requirements of ultrasonic probes in high-temperature environments.

[0010] When traditional piezoelectric ultrasonic probes are used for corrosion detection of pressure pipelines, the performance of the ultrasonic transducer changes or fails as the temperature rises. The probe structure has poor stability in high-temperature environments and cannot complete the corrosion detection of high-temperature pressure pipelines.

[0011] In view of this, the inventors of this application have designed a high-temperature piezoelectric ultrasonic detection component for pipeline corrosion detection in order to overcome the above-mentioned technical problems. Utility Model Content

[0012] The technical problem to be solved by this utility model is to overcome the defects in the prior art, such as the performance of ultrasonic transducers changing or failing with the increase of temperature, and the poor stability of the probe structure in high temperature environment, which makes it impossible to complete the corrosion detection of high temperature and pressure pipelines. The present invention provides a high temperature piezoelectric ultrasonic detection component for pipeline corrosion detection.

[0013] The present invention solves the above-mentioned technical problems through the following technical solution:

[0014] A high-temperature piezoelectric ultrasonic testing assembly for pipeline corrosion detection is characterized in that the high-temperature piezoelectric ultrasonic testing assembly includes: multiple probes and multiple wedges, each probe includes a probe body, a fixing part and a cable outlet, the probe body is fixedly connected to the wedges through the fixing part, and the cable outlet is provided on the probe body for cable connection of the probe;

[0015] The probe body of each of the aforementioned probes uses high-temperature resistant epoxy resin and powder to press the backing sound-absorbing material into a backing block, and then uses a high-temperature bonding process to bond it to the piezoelectric generating material layer.

[0016] According to one embodiment of the present invention, the various probes include a high-temperature thickness measurement probe, a high-temperature single-angle probe, and a high-temperature phased array probe.

[0017] According to one embodiment of the present invention, a first piezoelectric crystal is disposed in the probe body of the high-temperature thickness measuring probe. The first piezoelectric crystal includes a first shell, a cable, a backing sound-absorbing material, a piezoelectric sound-generating material, and a matching sound-transmitting material. The cable passes through the outlet into the first shell. The backing sound-absorbing material, the piezoelectric sound-generating material, and the matching sound-transmitting material are pressed together and connected to the cable.

[0018] According to one embodiment of the present invention, the lower part of the probe body of the high-temperature thickness measuring probe is provided with a connecting surface, and the probe body cooperates with the wedge block through the connecting surface.

[0019] According to one embodiment of the present invention, the first outer shell is a polytetrafluoroethylene (PTFE) shell.

[0020] According to one embodiment of the present invention, a second piezoelectric crystal is disposed in the probe body of the high-temperature single-angle probe. The second piezoelectric crystal includes a second shell, a cable, a backing sound-absorbing material, a piezoelectric sound-generating material, and a damping block. A wedge is disposed at the bottom of the second shell, and the damping block is mounted on the wedge. The piezoelectric sound-generating material is filled in the damping block, and the backing sound-absorbing material is filled in the second shell and located outside the damping block.

[0021] The cable passes through the outlet into the second housing, and the backing sound-absorbing material and the piezoelectric sound-generating material are pressed together and connected to the cable.

[0022] According to one embodiment of the present invention, the lower part of the probe body of the high-temperature single-angle probe is provided with a connecting surface, and the probe body cooperates with the wedge block through the connecting surface.

[0023] According to one embodiment of the present invention, the second outer shell is a polytetrafluoroethylene (PTFE) shell.

[0024] According to one embodiment of the present invention, a third piezoelectric crystal is disposed in the probe body of the high-temperature phased array probe. The third piezoelectric crystal includes a third shell, a cable, a backing sound-absorbing material, a piezoelectric sound-generating material, and a matching sound-transmitting material. The cable passes through the outlet into the third shell. The backing sound-absorbing material, the piezoelectric sound-generating material, and the matching sound-transmitting material are pressed together and connected to the cable.

[0025] According to one embodiment of the present invention, the lower part of the probe body of the high-temperature phased array probe is provided with a connecting surface, and the probe body cooperates with the wedge block through the connecting surface.

[0026] The positive and progressive effects of this utility model are as follows:

[0027] This invention relates to a high-temperature piezoelectric ultrasonic testing component for pipeline corrosion detection. Applied to online detection of pressure pipelines under high-temperature operating conditions, it features high corrosion detection efficiency and good stability at 350℃. This high-temperature piezoelectric ultrasonic testing component provides important basis for the development of rapid pipeline corrosion detection technology and high-temperature special probes. Attached Figure Description

[0028] The above and other features, properties and advantages of this utility model will become more apparent from the following description taken in conjunction with the accompanying drawings and embodiments, in which the same reference numerals always denote the same features, wherein:

[0029] Figure 1 This is a schematic diagram of the high-temperature thickness measuring probe in the high-temperature piezoelectric ultrasonic testing assembly for pipeline corrosion detection of this utility model.

[0030] Figure 2 This is a schematic diagram of the structure of the first piezoelectric crystal inside the high-temperature thickness measuring probe in the high-temperature piezoelectric ultrasonic probing assembly for pipeline corrosion detection of this utility model.

[0031] Figure 3 This is a schematic diagram of the high-temperature single-angle probe in the high-temperature piezoelectric ultrasonic testing assembly for pipeline corrosion detection of this utility model.

[0032] Figure 4 This is a schematic diagram of the structure of the second piezoelectric crystal inside the high-temperature single-angle probe in the high-temperature piezoelectric ultrasonic detection assembly for pipeline corrosion detection of this utility model.

[0033] Figure 5 This is a front view of the high-temperature phased array probe in the high-temperature piezoelectric ultrasonic testing assembly for pipeline corrosion detection of this utility model.

[0034] Figure 6 This is a side view of the high-temperature phased array probe in the high-temperature piezoelectric ultrasonic testing assembly for pipeline corrosion detection of this utility model.

[0035] Figure 7 This is a schematic diagram of the structure of the third piezoelectric crystal inside the high-temperature phased array probe in the high-temperature piezoelectric ultrasonic detection assembly for pipeline corrosion detection of this utility model. Detailed Implementation

[0036] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0037] Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Preferred embodiments of the present invention will now be described in detail, examples of which are shown in the drawings. Wherever possible, the same reference numerals will be used in all the drawings to denote the same or similar parts.

[0038] Furthermore, although the terminology used in this invention is selected from commonly known and used terms, some terms mentioned in this specification may have been selected by the applicant in his or her judgment, and their detailed meanings are explained in the relevant sections of the description herein.

[0039] Furthermore, it is required that this utility model be understood not only through the actual terminology used, but also through the meaning implied by each term.

[0040] like Figures 1 to 6As shown, this utility model discloses a high-temperature piezoelectric ultrasonic testing assembly for pipeline corrosion detection, which includes multiple probes and multiple wedges. For example, in this embodiment, the multiple probes include a high-temperature thickness measuring probe 100, a high-temperature single-angle probe 200, and a high-temperature phased array probe 300.

[0041] like Figure 1 and Figure 2 As shown, the high-temperature thickness gauge probe 100 includes a probe body 110, a fixing part, and a cable outlet 120. The probe body 110 is fixedly connected to a wedge block 130 (e.g., a high-temperature wedge block) via the fixing part, for example, by using screws to fix the probe body 110 and the wedge block 130 together. The cable outlet 120 is provided on the probe body 110 and serves as a cable connection port for the high-temperature thickness gauge probe 100. A connecting surface is provided at the lower part of the probe body 110 of the high-temperature thickness gauge probe 100, and the probe body 110 cooperates with the wedge block 130 through the connecting surface.

[0042] The high-temperature thickness measurement probe 100 has a first piezoelectric crystal housed within its probe body 110. This first piezoelectric crystal includes a first housing 140, a cable 150, a backing sound-absorbing material 160, a piezoelectric sound-generating material 170, and a matching sound-transmitting material 180. The cable 150 passes through the outlet 120 into the first housing 140. The backing sound-absorbing material 160, the piezoelectric sound-generating material 170, and the matching sound-transmitting material 180 are integrally formed and connected to the cable 150. Preferably, the first housing 140 is made of polytetrafluoroethylene (PTFE). The high-temperature thickness measurement probe 100 is manufactured using a die-casting process. Within the probe body 110, the backing sound-absorbing material 160 is pressed into a dense and stable backing block using high-temperature epoxy resin and powder, and then bonded to the piezoelectric sound-generating material 170 using a high-temperature bonding process.

[0043] This application employs a special curing and molding process to cure the first piezoelectric wafer and the wedge 130 at a gradient curing temperature, so as to ensure that the probe can withstand the impact of high temperature environment and that the wedge 130 and the first piezoelectric wafer are firmly bonded and do not separate during the use of the probe.

[0044] Based on the above structural description, the working principle of the high-temperature thickness probe 100 is as follows: based on the propagation characteristics of ultrasonic waves in different media, the thickness of the workpiece being measured is calculated by measuring the propagation time of ultrasonic waves in the material.

[0045] like Figure 3 and Figure 4As shown, the high-temperature single-angle probe 200 includes a probe body 210, a fixing part, and a cable outlet 220. The probe body 210 is fixedly connected to a wedge 230 (e.g., a high-temperature wedge) via the fixing part, for example, by using screws to fix the probe body 210 and the wedge 230 together. The cable outlet 220 is provided on the probe body 210 and serves as a cable connection port for the high-temperature single-angle probe 200. A connecting surface is provided at the lower part of the probe body 210 of the high-temperature single-angle probe 200, through which the probe body 210 engages with the wedge 230.

[0046] The high-temperature single-angle probe 200 has a second piezoelectric crystal housed within its probe body 210. This second piezoelectric crystal includes a second housing 240, a cable 250, a backing sound-absorbing material 260, a piezoelectric sound-generating material 270, and a damping block 280. A wedge 290 is positioned at the bottom of the second housing 240, and the damping block 280 is mounted on it. The piezoelectric sound-generating material 270 is filled within the damping block 280, while the backing sound-absorbing material 260 is filled within the second housing 240 and located outside the damping block 280. The cable 250 passes through an outlet 220 into the second housing 240. The backing sound-absorbing material 260 and the piezoelectric sound-generating material 270 are integrally formed and connected to the cable 250. Preferably, the second housing 240 is made of polytetrafluoroethylene (PTFE). The high-temperature single-angle probe 200 is manufactured using a die-casting process. The backing sound-absorbing material 260 is pressed into a dense and stable backing block using high-temperature resistant epoxy resin and powder inside the probe body 210, and then bonded to the piezoelectric generating material 270 using a high-temperature bonding process.

[0047] This application employs a special curing molding process to cure the first piezoelectric wafer and the wedge 230 at a gradient curing temperature, so as to ensure that the probe can withstand the impact of high temperature environment and that the wedge 230 and the first piezoelectric wafer are firmly bonded and do not separate during the use of the probe.

[0048] Based on the above structural description, the working principle of the high-temperature single-angle probe 200 is as follows: based on wave type conversion and oblique incidence characteristics, it achieves multi-angle detection of the workpiece by generating transverse waves or surface waves.

[0049] like Figures 5 to 7 As shown, the high-temperature phased array probe 300 includes a probe body 310, a fixing part, and a cable outlet 320. The probe body 310 is fixedly connected to a wedge 330 (e.g., a high-temperature wedge) via the fixing part, for example, by using screws to fix the probe body 310 and the wedge 330 together. The cable outlet 320 is provided on the probe body 310 and serves as a cable connection port for the high-temperature phased array probe 300. A connecting surface is provided at the lower part of the probe body 310 of the high-temperature phased array probe 300, through which the probe body 310 engages with the wedge 330.

[0050] The high-temperature phased array probe 300 has a third piezoelectric crystal housed within its probe body 310. This third piezoelectric crystal comprises a third housing 340, a cable 350, a backing sound-absorbing material 360, a piezoelectric sound-generating material 370, and a matching sound-transmitting material 380. The cable 350 passes through the outlet 320 into the third housing 340. The backing sound-absorbing material 360, the piezoelectric sound-generating material 370, and the matching sound-transmitting material 380 are integrally formed and connected to the cable 350. Preferably, the third housing 340 is made of polytetrafluoroethylene (PTFE). The high-temperature phased array probe 300 is manufactured using a die-casting process. Inside the probe body 310, the backing sound-absorbing material 360 is pressed into a dense and stable backing block using high-temperature epoxy resin and powder, and then bonded to the piezoelectric sound-generating material 370 using a high-temperature bonding process.

[0051] This application employs a special curing molding process to cure the first piezoelectric wafer and the wedge 330 at a gradient curing temperature, so as to ensure that the probe can withstand the impact of high temperature environment and that the wedge 330 and the first piezoelectric wafer are firmly bonded and do not separate during the use of the probe.

[0052] Based on the above structural description, the working principle of the high-temperature phased array probe 300 is as follows: based on the coordinated transmission and reception of ultrasonic waves by multiple array elements, the focusing, deflection and scanning of the sound beam are achieved by controlling the excitation time of each array element.

[0053] Based on the above structural description, the materials used in this application, including piezoelectric sound-generating materials, matching sound-transmitting materials, backing sound-absorbing materials, circuit components, and wedges, all need to have certain temperature resistance. Simultaneously, the high-temperature resistant adhesive used to assemble these components needs to be stable in high-temperature environments, not softening at high temperatures, and preventing the bonded parts from easily detaching.

[0054] For the high-temperature piezoelectric ultrasonic testing component, the potting epoxy material should be selected with minimal thermal expansion and contraction under high-temperature conditions. Furthermore, the inner wall of the outer shell and the area around the sound head should be thoroughly cleaned before potting to improve adhesion to the potting epoxy material. Simultaneously, the vacuuming force during potting should be increased to improve the density of the potting.

[0055] Furthermore, the high-temperature piezoelectric ultrasonic probing assembly uses high-temperature resistant resin as the wedge material for the high-temperature probe to ensure that the change in the probe's refraction angle is minimized within a certain temperature range. The composite polymer phase selected for the high-temperature piezoelectric ultrasonic probing assembly has a high glass transition temperature, and the Curie temperature of the piezoelectric wafer material is more than twice the operating temperature, ensuring that the piezoelectric wafer does not depolarize at high temperatures.

[0056] In addition, the high-temperature piezoelectric ultrasonic detection component uses high-temperature epoxy resin as the filler material for the composite wafer to ensure that the epoxy resin and piezoelectric ceramic structure are stable at high temperatures and that the various electrical properties of the piezoelectric composite material do not change significantly.

[0057] Based on the above structural description, the working process of the high-temperature piezoelectric ultrasonic detection component used in this application is as follows:

[0058] Step 1: After determining the testing location, polish and remove paint, loose rust, loose material, scale, partially detached coating, other contaminants, or uneven surfaces on the test surface of the object being tested.

[0059] Alternatively, a thickness gauge with the ability to measure the thickness of the substrate through the paint layer can be used to ensure that the thickness gauge can provide a stable degree display.

[0060] Step 2: Arrange evenly distributed axial and circumferential measuring lines on the inspected object. The number of measuring lines is determined by the wall thickness of the inspected pipe. For diameters Φ≥360mm, 8 longitudinal measuring lines are evenly distributed around the circumference; for diameters Φ<360mm, 4 longitudinal measuring lines are evenly distributed around the circumference.

[0061] Step 3: Apply coupling agent to the pipe under inspection to ensure effective coupling between the probe and the workpiece.

[0062] Step 4: Install the high-temperature detection components: Select wedge 130 of the high-temperature thickness probe, wedge 230 of the high-temperature single-angle probe, and wedge 330 of the high-temperature phased array probe that match the pipe diameter. Bond the probes and high-temperature wedges together with high-temperature epoxy.

[0063] Step 5: Connect the high-temperature thickness probe and the high-temperature single-angle probe to the ultrasonic testing instrument, and use the high-temperature thickness probe and the high-temperature single-angle probe to locate the corroded part and measure the wall thickness of the corrosion pit.

[0064] Step 6: Connect the high-temperature phased array probe to the phased array ultrasonic detector and use ultrasonic phased array detection technology to accurately measure the identified corrosion area.

[0065] Steps one through three above constitute the preliminary preparations for the operation of the three types of probes. Steps four and five are the usage steps for the high-temperature thickness measuring probe and the high-temperature single-angle probe. Steps four and six are the usage steps for the high-temperature phased array probe. In this application, the testing of the high-temperature phased array probe shall be performed after the testing of the high-temperature thickness measuring probe and the high-temperature single-angle probe.

[0066] This application presents a high-temperature piezoelectric ultrasonic testing component. Improvements have been made to the structure, materials, and manufacturing process of the individual probe, enabling stable testing at 350℃ for a single component. Combining multiple probes, such as a high-temperature thickness gauge probe, a high-temperature single-angle probe, and a high-temperature phased array probe, allows for online inspection of pressure pipelines under high-temperature operating conditions, offering advantages such as high corrosion detection efficiency and accurate corrosion quantification.

[0067] This utility model relates to a high-temperature piezoelectric ultrasonic detection component, which firmly bonds the piezoelectric material, matching layer, and backing material, enabling operation at 350°C. Furthermore, it employs an innovative new piezoelectric ceramic material, improving the ceramic material's formulation and sintering process to raise the Curie temperature of the piezoelectric material to 500°C, thus allowing the piezoelectric sound-generating material to operate at 350°C.

[0068] In summary, this invention provides a high-temperature piezoelectric ultrasonic testing component for pipeline corrosion detection. Applied to online detection of pressure pipelines under high-temperature operating conditions, it exhibits high corrosion detection efficiency and good stability at 350℃. This high-temperature piezoelectric ultrasonic testing component provides important insights for the development of rapid pipeline corrosion detection technology and high-temperature specialized probes.

[0069] For those skilled in the art, the above disclosure is merely illustrative and does not constitute a limitation of this application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and corrections to this application. Such modifications, improvements, and corrections are suggested in this application and therefore remain within the spirit and scope of the exemplary embodiments of this application.

[0070] Furthermore, this application uses specific terms to describe embodiments of the application. For example, "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic related to at least one embodiment of the application. Therefore, it should be emphasized and noted that "an embodiment," "one embodiment," or "an alternative embodiment" mentioned twice or more in different locations in this specification do not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of the application can be appropriately combined.

[0071] Similarly, it should be noted that, in order to simplify the description of the present application and thus aid in the understanding of one or more embodiments of the invention, the foregoing description of the embodiments of the present application sometimes combines multiple features into a single embodiment, drawing, or description thereof. However, this disclosure method does not imply that the subject matter of the present application requires more features than those mentioned in the claims. In fact, the embodiments have fewer features than all the features of a single embodiment disclosed above. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which may be changed depending on the characteristics required by individual embodiments. In some embodiments, the numerical parameters should take into account the prescribed significant digits and adopt a general method of digit reservation. Although the numerical ranges and parameters used to confirm their breadth of scope in some embodiments of the present application are approximate values, in specific embodiments, such values ​​are set as precisely as feasible.

[0072] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A high-temperature piezoelectric ultrasonic testing assembly for pipeline corrosion detection, characterized in that, The high-temperature piezoelectric ultrasonic probing assembly includes: multiple probes and multiple wedges. Each probe includes a probe body, a fixing part, and a cable outlet. The probe body is fixedly connected to the wedges through the fixing part. The cable outlet is provided on the probe body and is used for the cable connection of the probe. The probe body of each of the aforementioned probes uses high-temperature resistant epoxy resin and powder to press the backing sound-absorbing material into a backing block, and then uses a high-temperature bonding process to bond it to the piezoelectric generating material layer.

2. The high-temperature piezoelectric ultrasonic testing assembly for pipeline corrosion detection as described in claim 1, characterized in that, The various probes include high-temperature thickness measurement probes, high-temperature monoclinic probes, and high-temperature phased array probes.

3. The high-temperature piezoelectric ultrasonic testing assembly for pipeline corrosion detection as described in claim 2, characterized in that, The high-temperature thickness measuring probe has a first piezoelectric crystal inside its probe body. The first piezoelectric crystal includes a first shell, a cable, a backing sound-absorbing material, a piezoelectric sound-generating material, and a matching sound-transmitting material. The cable passes through the outlet into the first shell. The backing sound-absorbing material, the piezoelectric sound-generating material, and the matching sound-transmitting material are pressed together and connected to the cable.

4. The high-temperature piezoelectric ultrasonic testing assembly for pipeline corrosion detection as described in claim 3, characterized in that, The lower part of the probe body of the high-temperature thickness measuring probe is provided with a connecting surface, and the probe body cooperates with the wedge block through the connecting surface.

5. The high-temperature piezoelectric ultrasonic testing assembly for pipeline corrosion detection as described in claim 3, characterized in that, The first outer shell is a polytetrafluoroethylene (PTFE) shell.

6. The high-temperature piezoelectric ultrasonic testing assembly for pipeline corrosion detection as described in claim 2, characterized in that, The high-temperature single-angle probe has a second piezoelectric crystal inside its probe body. The second piezoelectric crystal includes a second shell, a cable, a backing sound-absorbing material, a piezoelectric sound-generating material, and a damping block. A wedge is provided at the bottom of the second shell, and the damping block is installed on the wedge. The piezoelectric sound-generating material is filled inside the damping block, and the backing sound-absorbing material is filled inside the second shell and located outside the damping block. The cable passes through the outlet into the second housing, and the backing sound-absorbing material and the piezoelectric sound-generating material are pressed together and connected to the cable.

7. The high-temperature piezoelectric ultrasonic testing assembly for pipeline corrosion detection as described in claim 6, characterized in that, The lower part of the probe body of the high-temperature single-inclination probe is provided with a connecting surface, and the probe body cooperates with the wedge block through the connecting surface.

8. The high-temperature piezoelectric ultrasonic testing assembly for pipeline corrosion detection as described in claim 6, characterized in that, The second outer shell is a polytetrafluoroethylene (PTFE) shell.

9. The high-temperature piezoelectric ultrasonic testing assembly for pipeline corrosion detection as described in claim 2, characterized in that, The high-temperature phased array probe has a third piezoelectric crystal inside its probe body. The third piezoelectric crystal includes a third shell, a cable, a backing sound-absorbing material, a piezoelectric sound-generating material, and a matching sound-transmitting material. The cable passes through the outlet into the third shell. The backing sound-absorbing material, the piezoelectric sound-generating material, and the matching sound-transmitting material are pressed together and connected to the cable.

10. The high-temperature piezoelectric ultrasonic testing assembly for pipeline corrosion detection as described in claim 2, characterized in that, The lower part of the probe body of the high-temperature phased array probe is provided with a connecting surface, and the probe body cooperates with the wedge block through the connecting surface.

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