Corrosion-resistant and wear-resistant embedded pipeline structure and preparation method thereof

Abstract

The invention discloses a preparation method of a corrosion-resistant and wear-resistant embedded pipeline structure, which comprises the following steps: S1, machining a metal pipe fitting to obtain a metal pipe; s2, preparing a graphite high-temperature mold; s3, preparing a preform blank of the ceramic tube according to the graphite high-temperature mold obtained in the step S2; s4, densifying the preform blank to obtain a ceramic tube; and S5, the metal pipe obtained in the step S1 and the ceramic pipe obtained in the step S4 are assembled, and a product pipeline is obtained. The ceramic pipe is embedded in the metal pipe and serves as a pipeline lining of the metal pipe, the service life of the pipeline can be greatly prolonged, the safety of the pipeline can be greatly improved, accordingly, the abrasion resistance and corrosion resistance of the metal pipeline are improved, the service cycle of the metal pipeline is prolonged, and then the use cost of the metal pipeline is reduced.

Description

Technical Field

[0001] This invention relates to the field of pipeline technology, specifically to an embedded pipeline structure with corrosion and wear resistance and its preparation method. Background Technology

[0002] In numerous industries such as metallurgy, mining, chemical engineering, and pharmaceuticals, pipelines are the most common carriers for transporting liquids, powders, and gases. During transportation, the pipe body is subjected to multiple effects, including impact, erosion, and corrosion, leading to problems such as wear, damage, and perforation, especially at bends in the pipeline where wear and damage are more pronounced. This results in short pipeline lifespan, high maintenance and operating costs, and significant safety hazards.

[0003] Continuous fiber-reinforced ceramic matrix composites are a new type of structural / functional integrated material that combines the advantages of metallic, ceramic, and carbon materials. They are characterized by high temperature resistance, low density, high specific strength, high hardness, erosion resistance, oxidation resistance, corrosion resistance, and wear resistance, and have wide applications in machinery, aerospace, chemical, and energy fields.

[0004] Using continuous fiber-reinforced ceramic matrix composite pipe liners can significantly improve the service life and safety of pipes. Furthermore, the continuous fiber preform molding process is excellent, allowing for the fabrication of large-size and complex-shaped structures. The precursor impregnation pyrolysis (PIP) and reactive solution infiltration (RMI) composite processes have high ceramicization efficiency, high density, and short process cycles, which can overcome the shortcomings of existing technologies. Summary of the Invention

[0005] To address the aforementioned problems in the prior art, this invention provides an embedded pipe structure and its fabrication method that are corrosion-resistant and wear-resistant, thus solving the problem of easy corrosion and wear in existing metal pipes.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: An embedded pipe structure with corrosion and wear resistance and its manufacturing method are provided, which includes the following steps: Step S1: Machining the metal pipe fittings to obtain a metal pipe; Step S2: Prepare a high-temperature graphite mold; Step S3: Prepare the preform blank of the ceramic tube according to the graphite high-temperature mold obtained in step S2; Step S4: Densify the preform blank to obtain a ceramic tube; Step S5: Assemble the metal tube obtained in step S1 and the ceramic tube obtained in step S4 to obtain the product pipe.

[0007] This invention uses a ceramic tube embedded inside a metal tube as a lining, which can significantly improve the service life and safety of the pipeline, thereby enhancing the wear resistance and corrosion resistance of the metal pipeline, extending its service life, and reducing its operating costs.

[0008] Further, in step S1, the metal pipe is machined according to the predetermined size and angle requirements, and then the machined metal pipe is tooled and positioned, and the connecting flange (50) is welded to the end of the metal pipe to obtain the metal pipe.

[0009] Furthermore, the graphite high-temperature mold in step S2 includes an upper mold and a lower mold arranged opposite to each other. A fixing groove is provided between the mating end faces of the upper mold and the lower mold, and an inner mold is provided in the fixing groove. The inner mold is embedded in the fixing groove and is fixed by the upper mold and the lower mold.

[0010] Furthermore, there is a gap of 1-3mm between the mating end faces of the upper and lower molds.

[0011] Furthermore, the method for preparing the preform blank of the ceramic tube in step S3 includes: using the inner mold as a reference, weaving the preform blank on the inner mold with a fiber-reinforced three-dimensional needle-punched preform, then closing the preform blank with the inner mold with the upper and lower molds, and finally clamping and fixing it with a graphite bow-shaped clamp.

[0012] Furthermore, the method for densifying the preform blank in step S4 includes: Step S41: Pre-impregnate and cure the precast blank with slurry; Step S42: Impregnate, cure, and pyrolyze the preform blank obtained in step S41 with resin; Step S43: Densify the preform blank obtained in step S42 to obtain a ceramic tube.

[0013] Furthermore, the assembly method in step S5 includes: Step S51: Insert the ceramic tube into the metal tube along the length of the metal tube; Step S52: Fill the gap between the ceramic tube and the metal tube with SiC powder, and vibrate the metal tube from different directions during the filling process; Step S53: Check the gap between the ceramic tube and the metal tube after SiC powder filling; if the gap is uneven, repeat step S52; if the gap is uniform, proceed to the next step. Step S54: Phenolic resin is injected into the SiC powder filling area, and then the phenolic resin-filled pipe is placed in an oven and cured at 150°C for 2-5 hours to obtain the product pipe.

[0014] On the other hand, an embedded pipe structure with corrosion and wear resistance includes a metal pipe and a ceramic pipe, wherein the ceramic pipe is disposed on the metal pipe and a filler layer is disposed between the metal pipe and the ceramic pipe; and a connecting flange is provided at the end of the metal pipe.

[0015] Furthermore, metal and ceramic pipes are straight and bent, while pipes with uniform cross-sections and pipes tapered in one direction along their length have a circular or square cross-section.

[0016] This invention discloses an embedded pipe structure with corrosion and wear resistance and its preparation method, the beneficial effects of which are: 1. This invention uses a ceramic tube embedded inside a metal tube as the inner lining of the metal tube, which can significantly improve the service life and safety of the pipeline, thereby enhancing the wear resistance and corrosion resistance of the metal pipeline, extending its service life, and reducing its usage cost.

[0017] 2. In this invention, the preform blank of the ceramic tube is fixed by the upper and lower molds, which improves the flatness of the outer surface of the ceramic tube and is beneficial to the assembly and connection with the metal tube.

[0018] 3. In this invention, the preform blank of the ceramic tube is fixed by an inner mold, which makes the tube wall thickness dimension stable, ensures the deformation of the inner diameter of the composite material tube, and prevents the preform from deforming and collapsing.

[0019] 4. In this invention, the filling layer between the ceramic tube and the metal tube is filled with phenolic resin and silicon carbide powder, which realizes gapless connection and assembly, and the overall structure has good airtightness and structural stability. Attached Figure Description

[0020] Figure 1 This is a schematic flowchart illustrating a method for preparing an embedded pipe structure with corrosion and wear resistance according to the present invention.

[0021] Figure 2 This is a schematic diagram of the first type of pipe structure of the present invention.

[0022] Figure 3 This is a schematic diagram of the structure of the first type of high-temperature graphite mold of the present invention.

[0023] Figure 4 For the present invention Figure 3 A schematic diagram of the structure at point A in the middle.

[0024] Figure 5 This is a schematic diagram of the second type of pipe structure of the present invention.

[0025] Figure 6 This is an exploded structural diagram of the second type of pipeline structure of the present invention.

[0026] Figure 7This is a schematic diagram of the structure of the second type of graphite high-temperature mold of the present invention.

[0027] Figure 8 This is a schematic diagram of the third type of pipe structure of the present invention.

[0028] Figure 9 This is a schematic diagram of the structure of the third type of high-temperature graphite mold of the present invention.

[0029] Among them, 10 is a metal tube; 20 is a ceramic tube; 30 is a filling layer; 40 is a graphite high-temperature mold; 41 is an upper mold; 42 is a lower mold; 43 is a fixing groove; 44 is an inner mold; and 50 is a connecting flange. Detailed Implementation The specific embodiments of the present invention are described below to enable those skilled in the art to understand the present invention. However, it should be understood that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, various changes are obvious as long as they are within the spirit and scope of the present invention as defined and determined by the appended claims. All inventions utilizing the concept of the present invention are protected.

[0030] Example 1 refer to Figures 1-9 This embodiment provides a method for preparing an embedded pipe structure that is corrosion-resistant and wear-resistant, the purpose of which is to solve the problem of easy corrosion and wear of existing metal pipes. The specific steps in this embodiment will be described in detail below.

[0031] A method for fabricating an embedded pipe structure with corrosion and wear resistance includes the following steps: Step S1: Machining the metal pipe to obtain metal pipe 10; Specifically, in step S1, the metal pipe is machined according to the predetermined size and angle requirements. Then, the machined metal pipe is tooled and positioned, and the connecting flanges 50 are welded to the ends of the metal pipe to obtain the metal pipe 10.

[0032] In this embodiment, the metal pipe 10 is a straight pipe, a bent pipe, a pipe with a constant cross-section, or a pipe tapered in one direction along its length, with a circular or square cross-section. According to predetermined size and angle requirements, the metal pipe fittings are machined to ensure the relevant dimensional requirements. The machined metal pipe fittings are then tooled and positioned, and connecting flanges 50 are welded to the ends of the metal pipe fittings to obtain the metal pipe 10.

[0033] Step S2: Prepare a high-temperature graphite mold 40; Specifically, the graphite high-temperature mold 40 in step S2 includes an upper mold 41 and a lower mold 42 arranged opposite to each other. A fixing groove 43 is provided between the mating end faces of the upper mold 41 and the lower mold 42. An inner mold 44 is provided in the fixing groove 43. The inner mold 44 is embedded in the fixing groove and is clamped and fixed by the upper mold 41 and the lower mold 42.

[0034] There is a gap of 1-3mm between the mating end faces of the upper mold 41 and the lower mold 42.

[0035] In this embodiment, depending on the size, when the size is greater than 1 meter, the upper mold 41 and the lower mold 42 can be designed as a segmented structure. The adjacent segments of the upper mold 41 and the lower mold 42 are connected and assembled by bolts and pins, and a gap of 1~3mm is reserved between the upper mold 41 and the lower mold 42 to avoid interference. The upper mold 41 and the lower mold 42 are fixedly connected by graphite bow-shaped clamps.

[0036] The inner mold 44 uses a material with a density of 0.78 g / cm³. 3 Medium-density polyurethane wood substitute: This material is easy to process, has good dimensional stability, and serves as a reference mold. Furthermore, this material carbonizes and becomes porous above 250℃, facilitating demolding, especially for pipes with large curvatures, thus solving the demolding problem and functioning as a lost foam casting agent.

[0037] When necessary, the inner mold 44 can adopt a segmented structure that matches the inner shape of the preform blank of the ceramic tube 20, and be bonded together with resin glue. The entire inner mold 44 is machined to ensure the dimensional accuracy requirements.

[0038] Step S3: Prepare the preform blank of ceramic tube 20 according to the graphite high-temperature mold obtained in step S2; Specifically, the preparation method of the preform blank of ceramic tube 20 in step S3 includes: using the inner mold 44 as a reference, a preform blank is woven on the inner mold 44 using a fiber-reinforced three-dimensional needle-punched preform, and then the preform blank with the inner mold 44 is joined with the upper mold 41 and the lower mold 42, and finally clamped and fixed by a graphite bow-shaped clamp.

[0039] Step S4: Densify the preform blank to obtain ceramic tube 20; Specifically, the method for densifying the preform blank in step S4 includes: Step S41: Pre-impregnate and cure the precast blank with slurry; In this embodiment, the slurry uses SiC as the main material, a dispersant as an auxiliary material, and anhydrous ethanol as the dispersion solvent. SiC and the dispersant are added sequentially to anhydrous ethanol and stirred until homogeneous to form a SiC slurry for later use. The SiC slurry is then ball-milled to obtain a slurry with the required mass fraction.

[0040] The preform blank is placed in a vacuum environment and maintained for a period of time. It is then impregnated in SiC slurry. The impregnated preform blank is placed in a heating device for curing. This process is repeated 2-3 times to finally form a SiC particle-filled preform blank I.

[0041] Step S42: Impregnate, cure, and pyrolyze the preform blank obtained in step S41 with resin; In this embodiment, the preform blank I obtained in step S41 is placed in a vacuum pressure impregnation tank and kept under vacuum for a period of time. It is then impregnated in resin slurry. The impregnated preform blank is placed in a heating device and cured in stages. This process is repeated 2-3 times. The cured preform blank is then placed in a pyrolysis device for pyrolysis treatment, ultimately forming preform blank II.

[0042] Step S43: Densify the preform blank obtained in step S42 to obtain ceramic tube 20.

[0043] In this embodiment, the preform blank II obtained in step S42 is wrapped with Si and placed in a silicon infiltration furnace. Under vacuum, it undergoes a liquid silicon melting reaction densification treatment to finally obtain a densified ceramic tube 20.

[0044] Step S5: Assemble the metal tube 10 obtained in step S1 and the ceramic tube 20 obtained in step S4 to obtain the product pipe.

[0045] Specifically, the assembly method in step S5 includes: Step S51: Insert the ceramic tube 20 into the metal tube 10 along the length of the metal tube 10; In this embodiment, the ceramic tube 20 is inserted into the metal tube 10 along its length. To ensure that the gap between the ceramic tube 20 and the metal tube 10 is uniform, a pad of equal thickness can be used for positioning at the end opening of the metal tube 10.

[0046] Step S52: Fill the gap between the ceramic tube 20 and the metal tube 10 with SiC powder, and vibrate the metal tube 10 from different directions during the filling process. In this embodiment, 0.5-2 mm of SiC powder is filled into the gap between the ceramic tube 20 and the metal tube 10. During the filling process, the metal tube 10 is vibrated from different directions to ensure that the SiC powder is filled evenly and densely. At the same time, both ends are sealed to prevent the SiC powder from leaking.

[0047] Step S53: Check the gap between the ceramic tube 20 and the metal tube 10 after SiC powder filling; if the gap is uneven, repeat step S52; if the gap is uniform, proceed to the next step. In this embodiment, the filled ceramic tube 20 and metal tube 10 are inspected using CT cross-sections at different positions along their length to check whether the filling gap is uniform. If the gap is not uniform, step S52 is repeated until the uniformity of the filling material between the ceramic tube 20 and metal tube 10 meets the requirements. If the gap is uniform, the next step is performed. Step S54: Phenolic resin is injected into the SiC powder filling area, and then the phenolic resin-filled pipe is placed in an oven and cured at 150°C for 2-5 hours to obtain the product pipe.

[0048] In this embodiment, phenolic resin is injected into the SiC powder-filled area. During injection, it can be injected from one end while the other end is sealed, and any resin overflow is observed. If resin overflows, it is injected from the other end and sealed again, repeating this process multiple times to ensure uniform and sufficient resin injection. The phenolic resin injection pipeline is placed in an oven and cured at 150°C for 5 hours.

[0049] Example 2 refer to Figures 2-9 This embodiment provides a method for preparing an embedded pipe structure that is corrosion-resistant and wear-resistant, the purpose of which is to solve the problem of easy corrosion and wear of existing metal pipes. The specific structure in this embodiment will be described in detail below.

[0050] An embedded pipe structure with corrosion and wear resistance is prepared according to the preparation method of Example 1; it includes a metal pipe 10 and a ceramic pipe 20, the ceramic pipe 20 is disposed inside the metal pipe 10, and a filling layer 30 is disposed between the metal pipe 10 and the ceramic pipe 20; a connecting flange 50 is provided at the end of the metal pipe 10.

[0051] Specifically, the metal tube 10 and the ceramic tube 20 are straight tubes and bent tubes, tubes with uniform cross-sections and tubes tapered in one direction along their length, with a circular or square cross-section, as shown in the reference. Figures 2-4 , for reference only. Figure 8 and Figure 9 This is a diagram of a bent pipe.

[0052] In this embodiment, the filler layer 30 is composed of resin and silicon carbide particles. The filler layer 30 is uniformly filled with SiC powder with a particle size of 0.5~2mm, and then cured with resin to fuse the metal tube 10 and the ceramic tube 20 into a whole, which can achieve gapless assembly. The filler layer 30 formed by resin and silicon carbide particles has the characteristics of corrosion resistance and wear resistance. The ceramic tube 20 is embedded in the metal tube 10, and the ceramic tube 20 serves as the inner lining of the metal tube 10. It can achieve a double-layer protective sealing effect with the ceramic tube 20, and a triple-layer protective sealing effect with the ceramic tube 20 and the outermost metal tube 10. This can significantly improve the service life and safety of the pipeline, thereby improving the wear resistance and corrosion resistance of the metal pipeline, extending its service life, and reducing its use cost.

[0053] Optionally, the metal tube 10 can be divided into single or multiple sections along its length, depending on its size and manufacturability. Each section of the metal tube 10 is equipped with a connecting flange 50 at its end. The connecting flanges 50 of adjacent sections of the metal tube 10 are connected by bolts, thereby combining multiple sections of the metal tube 10 together and improving the assembly processability.

[0054] Optionally, the metal tube 10 can be a tee or a multi-way structure, see reference. Figures 5-7 .

[0055] Although specific embodiments of the invention have been described in detail with reference to the accompanying drawings, this should not be construed as limiting the scope of protection of this patent. Various modifications and variations that can be made by a person skilled in the art without inventive effort within the scope described in the claims still fall within the scope of protection of this patent.

Claims

1. A method for preparing an embedded pipe structure with corrosion and wear resistance, characterized in that, Includes the following steps: Step S1: Machining the metal pipe fittings to obtain a metal pipe (10); Step S2: Prepare a high-temperature graphite mold (40); Step S3: Prepare the preform blank of ceramic tube (20) based on the graphite high-temperature mold (40) obtained in step S2; Step S4: Densify the preform blank to obtain ceramic tube (20). Step S5: Assemble the metal tube (10) obtained in step S1 and the ceramic tube (20) obtained in step S4 to obtain the product pipe.

2. The method for preparing the corrosion-resistant and wear-resistant embedded pipe structure according to claim 1, characterized in that: In step S1, the metal pipe is machined according to the predetermined size and angle requirements. Then, the machined metal pipe is tooled and positioned, and the connecting flange (50) is welded to the end of the metal pipe to obtain the metal pipe (10).

3. The method for preparing the corrosion-resistant and wear-resistant embedded pipe structure according to claim 2, characterized in that: The graphite high-temperature mold (40) in step S2 includes an upper mold (41) and a lower mold (42) arranged opposite to each other. A fixing groove (43) is provided between the mating end faces of the upper mold (41) and the lower mold (42). An inner mold (44) is provided in the fixing groove (43). The inner mold (44) is embedded in the fixing groove (43) and is clamped and fixed by the upper mold (41) and the lower mold (42).

4. The method for preparing the corrosion-resistant and wear-resistant embedded pipe structure according to claim 3, characterized in that: There is a gap of 1-3mm between the mating end faces of the upper mold (41) and the lower mold (42).

5. The method for preparing an embedded pipe structure with corrosion and wear resistance according to claim 4, characterized in that, The preparation method of the preform blank of the ceramic tube (20) in step S3 includes: taking the inner mold (44) as the reference, using the fiber-reinforced three-dimensional needle-punched preform to weave the preform blank on the inner mold (44), then the preform blank with the inner mold (44) is closed with the upper mold (41) and the lower mold (42), and finally clamped and fixed by the graphite bow clamp.

6. The method for preparing an embedded pipe structure with corrosion and wear resistance according to claim 1, characterized in that, The method for densifying the preform blank in step S4 includes: Step S41: Pre-impregnate and cure the precast blank with slurry; Step S42: Impregnate, cure, and pyrolyze the preform blank obtained in step S41 with resin; Step S43: Densify the preform blank obtained in step S42 to obtain ceramic tube (20).

7. The method for preparing an embedded pipe structure with corrosion and wear resistance according to claim 1, characterized in that, The assembly method in step S5 includes: Step S51: Insert the ceramic tube (20) into the metal tube (10) along the length of the metal tube (10); Step S52: Fill the gap between the ceramic tube (20) and the metal tube (10) with SiC powder, and vibrate the metal tube (10) from different directions during the filling process. Step S53: Check the gap between the ceramic tube (20) and the metal tube (10) after SiC powder filling; if the gap is not uniform, repeat step S52; if the gap is uniform, proceed to the next step. Step S54: Phenolic resin is injected into the SiC powder filling area, and then the phenolic resin-filled pipe is placed in an oven and cured at 150°C for 2-5 hours to obtain the product pipe.

8. An embedded pipe structure with corrosion and wear resistance, characterized in that: The preparation method described in any one of claims 1-7 is used to prepare the material; it includes a metal tube (10) and a ceramic tube (20), wherein the ceramic tube (20) is disposed inside the metal tube (10), and a filling layer (30) is disposed between the metal tube (10) and the ceramic tube (20); a connecting flange (50) is provided at the end of the metal tube (10).

9. The embedded pipe structure with corrosion resistance and wear resistance according to claim 8, characterized in that: The metal tube (10) and ceramic tube (20) are straight tubes and bent tubes, tubes with equal cross sections and tubes tapered in one direction along the length, and their cross sections are circular or square.

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