Porous metal composite pipeline lining reinforced by graphene sheets

Abstract

The invention discloses a porous metal composite pipeline lining reinforced by graphene sheets. The porous metal composite pipeline lining reinforced by the graphene sheets is composed of a plurality of lining rings connected in sequence. Each lining ring is formed by mutually connecting 36 graphene sheet reinforced porous metal composite blocks in an isosceles triangle shape, and every two adjacent graphene sheet reinforced porous metal composite blocks are oppositely arranged in the length direction of the graphene sheet reinforced porous metal composite pipeline lining. The waists of every two adjacent porous metal composite blocks reinforced by the graphene sheets are connected with each other, and the bottom edges of every two spaced porous metal composite blocks reinforced by the graphene sheets are flush with each other and are connected with each other; the graphene sheet reinforced porous metal composite block is composed of graphene and foamed aluminum. In every two adjacent lining rings, the bottom edges of the porous metal composite blocks reinforced by the graphene sheets are connected with each other. On the basis, the gap between the lining and the old pipeline is reduced, and the overall stability of the structure is ensured.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of pipeline application, and particularly relates to a graphene sheet reinforced porous metal composite pipeline lining. BACKGROUND

[0002] Underground pipelines have played a huge role in economic construction and daily life all over the world. A large number of urban underground pipe networks (water supply, drainage, gas, industrial pipelines) have been in operation for decades or even hundreds of years. The pipeline materials (such as concrete, cast iron, steel, etc.) are affected by factors such as corrosion and wear during long-term service, resulting in structural damage (cracks, fractures and collapse) or functional defects (leakage, fouling and reduced flow capacity). These damages can cause serious consequences such as water resource waste, environmental pollution and infrastructure damage. In order to repair the pipeline, a "pipe-in-pipe" method is usually used to repair the damaged pipeline.

[0003] An octagonal polyhedral lining is disclosed in the article entitled "Buckling Analysis of Graphene Composite Reinforced Polyhedral Lining", although the lining can repair the damaged pipeline and maintain good structural strength; however, it can be understood that the pipeline is circular, and the octagonal polyhedral pipeline lining will have a gap between the damaged pipeline after being attached to the damaged pipeline, and the attachment will be unstable; and the existence of the gap will endanger the stability of the lining structure and cause mechanical damage, which will accelerate microbial corrosion and affect hydraulic transmission. In addition, the octagonal lining has the risk of stress concentration at the vertex position, which affects the structural strength of the lining. SUMMARY

[0004] The graphene sheet reinforced porous metal composite pipeline lining provided by the embodiments of the present application improves the structural strength of the lining.

[0005] According to a first aspect of the present application, the embodiments of the present application provide a graphene sheet reinforced porous metal composite pipeline lining, wherein:

[0006] The graphene sheet reinforced porous metal composite pipeline lining is composed of a plurality of lining rings connected in sequence; Each lining ring is composed of 36 isosceles triangular graphene sheet reinforced porous metal composite blocks connected to each other, adjacent two graphene sheet reinforced porous metal composite blocks are arranged in opposite directions along the length direction of the graphene sheet reinforced porous metal composite pipeline lining, and the waists of the adjacent two graphene sheet reinforced porous metal composite blocks are connected to each other, and the bottom edges of two graphene sheet reinforced porous metal composite blocks spaced from each other are flush and connected to each other; The graphene sheet reinforced porous metal composite block is composed of graphene and foamed aluminum; The bottom edges of the graphene sheet reinforced porous metal composite blocks in the two adjacent lining rings are connected to each other.

[0007] Optionally, on the cross section of the graphene sheet reinforced porous metal composite block, the distribution of the foamed aluminum is any one of symmetrical distribution of pores, asymmetrical distribution of pores and uniform distribution of pores; and the distribution of the graphene is any one of symmetrical distribution of graphene, asymmetrical distribution of graphene and uniform distribution of graphene.

[0008] Optionally, the symmetrical distribution of the pores is that, in the cross section, the pores of the foamed aluminum are distributed in a decreasing manner from both sides to the middle along the thickness direction of the graphene sheet reinforced porous metal composite pipe lining.

[0009] Optionally, the asymmetrical distribution of the pores is that, in the cross section, the pores of the foamed aluminum are distributed in a gradient decreasing manner from one side to the other side along the thickness direction of the graphene sheet reinforced porous metal composite pipe lining.

[0010] Optionally, the uniform distribution of the pores is that, in the cross section, the adjacent pores of the foamed aluminum are arranged at equal intervals.

[0011] Optionally, the symmetrical distribution of the graphene is that, in the cross section, the content of the graphene is distributed in a decreasing manner from both sides to the middle along the thickness direction of the graphene sheet reinforced porous metal composite pipe lining.

[0012] Optionally, the asymmetrical distribution of the graphene is that, in the cross section, the content of the graphene is distributed in a gradient decreasing manner from one side to the other side along the thickness direction of the graphene sheet reinforced porous metal composite pipe lining.

[0013] Optionally, the uniform distribution of the graphene is that, in the cross section, the adjacent graphene is arranged at equal intervals.

[0014] Optionally, the distribution of the foamed aluminum is the uniform distribution of the pores; and the distribution of the graphene is the symmetrical distribution of the graphene.

[0015] Optionally, the ratio of the height of the graphene sheet reinforced porous metal composite block to the maximum radius of the graphene sheet reinforced porous metal composite pipe lining is 0.302.

[0016] The technical scheme provided by the embodiment of the present application at least brings the following beneficial effects: The graphene sheet reinforced porous metal composite pipeline lining provided by the embodiment of the present application is composed of 36 graphene sheet reinforced porous metal composite blocks, thereby forming an 18-sided lining ring, and the 18-sided graphene sheet reinforced porous metal composite pipeline lining formed by multiple lining circular pipes can better closely fit the circular pipeline, greatly reducing the gap between the lining and the old pipeline, preventing the lining from being displaced, settled or deformed during service, and ensuring the overall stability of the structure; and the elimination of the gap means that there is no space for water accumulation and nutrient retention, which fundamentally cuts off the conditions for microbial breeding and corrosion, significantly prolonging the service life of the lining and the pipeline. In addition, the 18-sided graphene sheet reinforced porous metal composite pipeline lining is closer to a circle, and the smooth and continuous inner surface reduces fluid resistance, avoids vortex and energy loss at polygonal corners, and ensures the flow capacity of the repaired pipeline.

[0017] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0018] The drawings incorporated into the specification and forming part of the specification, show embodiments consistent with the present application, and together with the specification, serve to explain the principles of the present application, and do not constitute undue limitations on the present application.

[0019] REFERENCE NUMERALS

[0020] Figure 1 is a structural schematic diagram of a graphene sheet reinforced porous metal composite pipeline lining according to an exemplary embodiment; Figure 2 is a schematic diagram of a symmetric distribution structure of pores of foam aluminum according to an exemplary embodiment; Figure 3 is a schematic diagram of an asymmetric distribution structure of pores of foam aluminum according to an exemplary embodiment; Figure 4 is a schematic diagram of a uniform distribution structure of pores of foam aluminum according to an exemplary embodiment; Figure 5 is a schematic diagram of a symmetric distribution structure of graphene of graphene according to an exemplary embodiment; Figure 6 is a schematic diagram of an asymmetric distribution structure of graphene of graphene according to an exemplary embodiment; Figure 7 is a schematic diagram of a uniform distribution structure of graphene of graphene according to an exemplary embodiment; Figure 8 This is a schematic diagram illustrating the structural distribution of aluminum foam and graphene in a graphene-reinforced porous metal composite pipe lining according to an exemplary embodiment. Detailed Implementation

[0021] To better understand the above-mentioned objectives, features, and advantages of this disclosure, the solutions disclosed herein will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0022] Numerous specific details are set forth in the following description in order to provide a full understanding of this disclosure, but this disclosure may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some, and not all, of the embodiments of this disclosure.

[0023] As described in the background section, when an octagonal polyhedral pipe lining is fitted to a damaged pipe, gaps may exist between the lining and the damaged pipe, leading to unstable fit. Furthermore, these gaps can compromise the stability of the lining structure, causing mechanical failure, accelerating microbial corrosion, and affecting hydraulic transmission. In addition, the octagonal lining presents a risk of stress concentration at its vertices, impacting its structural strength.

[0024] Based on this, the present invention provides a graphene sheet-reinforced porous metal composite pipe lining 10. The graphene sheet-reinforced porous metal composite pipe lining 10 provided in the embodiments of the present invention will be described below first.

[0025] like Figure 1 As shown; Example 1; Optionally, in one example, the graphene sheet-reinforced porous metal composite pipe lining 10 consists of a plurality of sequentially connected lining rings 100; Each lining ring 100 is composed of 36 isosceles triangular graphene sheet-reinforced porous metal composite blocks 110 connected to each other. The graphene sheet-reinforced porous metal composite blocks 110 are arranged in opposite directions along the length of the graphene sheet-reinforced porous metal composite pipe lining 10, and the waists of the two adjacent graphene sheet-reinforced porous metal composite blocks 110 are connected to each other. The bottom edges of the two graphene sheet-reinforced porous metal composite blocks 110 that are spaced apart from each other are flush and connected to each other. The graphene-reinforced porous metal composite block 110 is composed of graphene 112 and aluminum foam 111; In two adjacent lining rings 100, the bottom edges of the graphene-reinforced porous metal composite blocks 110 are connected to each other.

[0026] In the above example, 36 graphene sheet reinforced porous metal composite blocks 110 are spliced into a ring-shaped lining ring 100, wherein each graphene sheet reinforced porous metal composite block 110 is an isosceles triangle including two sides and a base, the sides of two adjacent graphene sheet reinforced porous metal composite blocks 110 are connected to each other, and the bases of the two adjacent graphene sheet reinforced porous metal composite blocks 110 are respectively arranged on the two sides of the lining ring 100 along the length direction of the graphene sheet reinforced porous metal composite pipe lining 10. The bases of the graphene sheet reinforced porous metal composite blocks 110 arranged at intervals are connected to each other, and the 36 graphene sheet reinforced porous metal composite blocks 110 are sequentially connected end to end in this connection mode to form a ring-shaped structure. It should be noted that since the two adjacent graphene sheet reinforced porous metal composite blocks 110 are arranged in reverse, the sides of the lining ring 100 are the bases of the graphene sheet reinforced porous metal composite blocks 110, and thus the finally formed lining ring 100 is an 18-sided lining ring 100.

[0027] Specifically, the graphene sheet reinforced porous metal composite block 110 is a graphene 112 sheet reinforced porous metal composite material composed of graphene 112 and foamed aluminum 111. The graphene 112 sheet reinforced porous metal composite material has the advantages of low self-weight, high strength, strong corrosion resistance, etc. The application of the composite material to the lining can not only improve the mechanical strength, but also improve the corrosion resistance in complex and harsh environments, and prolong the service life of the lining ring 100.

[0028] Among them, graphene 112 is one of the strongest materials known, which can significantly improve the strength and toughness of polymer, metal or ceramic-based composite materials as a reinforcing filler. Foamed aluminum 111 is formed by adding additives to pure aluminum or aluminum alloy and then foaming, which has both metal and bubble characteristics.

[0029] The critical buckling pressure of the polygonal lining ring 100 of the graphene sheet reinforced porous metal composite block 110 is calculated, and the results are shown in Table 1:

[0030] Table 1 The greater the N (number of edges) is, the more the polyhedral graphene sheet reinforced porous metal composite pipeline lining 10 tends to be circular, which can better fit the pipeline. Although the smaller the N is, the greater the critical buckling pressure can be provided, due to the particularity of the polyhedral structure, the outer wall cannot completely fit the inner wall of the pipeline, leaving a gap, and the gap becomes larger as the N becomes smaller. The existence of the gap can endanger the stability of the lining structure, leading to mechanical failure, accelerate microbial corrosion, and affect hydraulic transmission. In addition, the smaller the N is, the risk of stress concentration at the vertex position exists. In order to utilize the polyhedral structure to improve the pressure-bearing capacity while avoiding the above negative effects as much as possible. The critical buckling pressure of the polyhedral graphene sheet reinforced porous metal composite pipeline lining 10 is increased by 60% compared to the circular lining.

[0031] Based on this, 36 graphene sheet reinforced porous metal composite blocks 110 are combined together to form an 18-sided lining ring 100, and thus the 18-sided graphene sheet reinforced porous metal composite pipeline lining 10 composed of multiple lining rings 100 can better closely fit the circular pipeline, greatly reducing the gap between the lining and the old pipeline, preventing the lining from shifting, settling or deforming during service, and ensuring the overall stability of the structure; and the elimination of the gap means that there is no space for water and nutrients to accumulate, fundamentally cutting off the conditions for microbial breeding and corrosion, significantly extending the service life of the lining and the pipeline. In addition, the 18-sided graphene sheet reinforced porous metal composite pipeline lining 10 is more close to a circle, and the smooth and continuous inner surface reduces fluid resistance, avoids vortex and energy loss at the corners of the polygon, and ensures the flow capacity of the repaired pipeline.

[0032] It can be understood that the lining mentioned in the summary refers specifically to the graphene sheet reinforced porous metal composite pipeline lining 10 in the present application.

[0033] Optionally, in an example, on the cross section of the graphene sheet reinforced porous metal composite block 110, the distribution of the foamed aluminum 111 is any one of symmetrical distribution of pores, asymmetrical distribution of pores, and uniform distribution of pores; the distribution of graphene 112 is any one of symmetrical distribution of graphene, asymmetrical distribution of graphene, and uniform distribution of graphene.

[0034] ​In the above examples, the graphene flake reinforced porous metal composite block 110 is composed of graphene 112 and aluminum foam 111 mixed together, wherein the graphene flake reinforced porous metal composite block 110 can be prepared by first preparing the aluminum foam 111 and then filling the graphene 112 into the pores of the aluminum foam 111. Different graphene flake reinforced porous metal composite blocks 110 can be formed by different distribution modes of the aluminum foam 111 and different filling modes of the graphene 112. Thus, the graphene 112 and the aluminum foam 111 can present different distribution situations on the cross section of the graphene flake reinforced porous metal composite block 110.

[0035] Specifically, the distribution of the aluminum foam 111 can be any one of symmetric pore distribution, asymmetric pore distribution, and uniform pore distribution.

[0036] The distribution of the graphene 112 can be any one of symmetric graphene distribution, asymmetric graphene distribution, and uniform graphene distribution.

[0037] Optionally, in an example, the symmetric pore distribution is that, in the cross section, the pores of the aluminum foam 111 are distributed in a decreasing manner from both sides to the middle along the thickness direction of the graphene flake reinforced porous metal composite pipe lining 10.

[0038] In the above examples, the generation and arrangement of the aluminum foam 111 are controlled by directional solidification or gradient die casting technology. Specifically, the porosity of the material cross section is low on both sides (the outer surface), the density is high, and the material is more dense; then along the thickness direction to the center layer, the porosity gradually increases and the density gradually decreases. As shown in FIG. 3, a structure is formed in which the content of the aluminum foam 111 decreases from both sides to the middle of the cross section of the graphene flake reinforced porous metal composite block 110. Figure 2

[0039] Thus, when the symmetric pore distribution of the aluminum foam 111 is subjected to external impact or compression, the structure on both sides first bears the main load and provides strength support, and then the porous layer in the middle begins to collapse and deform layer by layer, which can very efficiently absorb and dissipate impact energy. In addition, the symmetric pore distribution of the aluminum foam 111 can provide a certain structural strength on both sides, better repair the pipe, and save materials and reduce the price.

[0040] It should be noted that the pore refers to the pore in the aluminum foam 111.

[0041] Optionally, in an example, the asymmetric pore distribution is that, in the cross section, the pores of the aluminum foam 111 are distributed in a gradient decreasing manner from one side to the other side along the thickness direction of the graphene flake reinforced porous metal composite pipe lining 10.

[0042] ​In the above examples, the gradient preparation technique (such as centrifugal casting, gradient sintering) is used, but the symmetry is deliberately broken. One surface of the material (e.g. designed to face the impact surface or high temperature surface) is made very dense (low porosity), and then the porosity and size gradually increase towards the other side (back surface), forming a continuous gradient change, so that the pores are asymmetrically distributed, as shown in Figure 3 Thus, the side with high density can be set as the outer side of the lining ring 100, which is suitable as the contact surface or bearing surface due to its high hardness, high strength and good wear resistance, so as to improve the strength of the graphene sheet reinforced porous metal composite pipeline lining 10.

[0043] Optionally, in an example, the pores are uniformly distributed: in the cross section, the pores of the adjacent aluminum foam 111 are equidistantly arranged.

[0044] In the above examples, the foaming agent (such as TiH2) is uniformly mixed in the molten aluminum, and then uniformly foamed in the mold, and finally cooled and formed to obtain a uniform distribution of pores, as shown in Figure 4 Thus, a material with uniform and consistent pore size, distribution and spacing is obtained. The aluminum foam 111 with this distribution has basically consistent mechanical and thermal properties in all directions, making the structural strength of the graphene sheet reinforced porous metal composite pipeline lining 10 more stable.

[0045] Optionally, in an example, the graphene is symmetrically distributed: in the cross section, the content of graphene 112 decreases from both sides to the center along the thickness direction of the graphene sheet reinforced porous metal composite pipeline lining 10.

[0046] In the above examples, because graphene 112 has electrical conductivity and magnetic resistance, graphene 112 can be suspended in a precursor such as aluminum powder slurry or melt by electric field or magnetic field orientation assembly technology, and then a directional electric field or magnetic field is applied to drive graphene 112 to move towards or away from a specific direction, and finally form a symmetric distribution of graphene with decreasing concentration from both sides to the center, as shown in Figure 5 Based on this, by arranging high content of graphene 112 on both sides of the graphene sheet reinforced porous metal composite block 110, the hardness, wear resistance and fatigue resistance of the inner and outer sides of the lining ring 100 are greatly improved, while the graphene 112 content in the middle part of the graphene sheet reinforced porous metal composite block 110 is the least, which makes the lining ring 100 can maintain good toughness, and thus the graphene sheet reinforced porous metal composite pipeline lining 10 can better adapt to the bending of the pipeline, so as to fit the pipeline.

[0047] Optionally, in an example, the graphene is asymmetrically distributed, that is, in a cross section, the content of graphene 112 is distributed in a gradient decreasing from one side to the other side along the thickness direction of the graphene sheet reinforced porous metal composite pipe lining 10.

[0048] In the above example, similar to the above-mentioned symmetric distribution of graphene, the field-assisted orientation technology (such as a unidirectional magnetic field) is adopted, but the control condition is to make the graphene 112 migrate and enrich to one surface, thereby forming a gradient distribution with decreasing concentration from one side to the other side, and obtaining the asymmetric distribution of graphene as shown in Figure 6 Based on this, the side with high content of graphene 112 can be arranged as the outer surface of the lining ring 100, so that the graphene sheet reinforced porous metal composite pipe lining 10 can obtain strong support performance on the outer surface, while reducing the use of graphene 112 and the cost of graphene sheet reinforced porous metal composite pipe lining 10.

[0049] Optionally, in an example, the graphene is uniformly distributed, that is, in a cross section, the adjacent graphene 112 is arranged at equal intervals.

[0050] In the above example, the graphene 112 nanosheet can be mechanically mixed with aluminum powder or aluminum melt for a long time and high intensity by a conventional composite process such as powder metallurgy or melt stirring, so as to achieve the uniform distribution of graphene as shown in Figure 7 Based on this, since the structure of graphene 112 in the graphene sheet reinforced porous metal composite block 110 is uniform, the stability of the graphene sheet reinforced porous metal composite block 110 can be better improved, and the structural strength of the graphene sheet reinforced porous metal composite pipe lining 10 can be improved.

[0051] Embodiment 2: Optionally, in an example, the distribution of the foamed aluminum 111 is that the pores are uniformly distributed, and the distribution of the graphene 112 is that the graphene is symmetrically distributed.

[0052] As shown in Figure 8 In the above example, by using the two distribution modes, the structural strength of the graphene sheet reinforced porous metal composite block 110 can be effectively ensured, the performance of the graphene sheet reinforced porous metal composite pipe lining 10 can be ensured, and the cost can be effectively reduced to avoid the possibility of high cost.

[0053] In the above embodiment 2, each method in the above-mentioned embodiment 1 is included, each process in the above-mentioned embodiment 1 can be implemented, and the same technical effects can be achieved. To avoid repetition, it will not be described here.

[0054] Embodiment 3: Optionally, in an example, the ratio of the height of the graphene sheet reinforced porous metal composite block 110 to the maximum radius of the graphene sheet reinforced porous metal composite pipe lining 10 is 0.302.

[0055] The graphene sheet reinforced porous metal composite pipe lining 10 is an equilateral polygon, the size of the equilateral polygon is related to the isosceles triangle of the graphene sheet reinforced porous metal composite block 110, the maximum radius of the graphene sheet reinforced porous metal composite pipe lining 10 refers to the radius of the minimum circle surrounding the equilateral polygon, and the height of the graphene sheet reinforced porous metal composite block 110 is the height of the isosceles triangle, that is, the length of the single lining ring 100. In order to make the whole graphene sheet reinforced porous metal composite pipe lining 10 structure stable and meet the requirement of structural strength, the ratio of the height of the graphene sheet reinforced porous metal composite block 110 to the maximum radius of the graphene sheet reinforced porous metal composite pipe lining 10 is determined to be 0.302.

[0056] In the above embodiment 3, each method in the above embodiment 1 and / or 2 is included, each process in the above embodiment 1 and / or 2 can be achieved, and the same technical effects can be achieved. To avoid repetition, details are not described here.

[0057] The above is only a specific implementation of the present application, and those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the above-described system, module and unit can refer to the corresponding process in the foregoing method embodiments, which will not be described here. It should be understood that the protection scope of the present application is not limited to this, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the present application, and these modifications or replacements should be covered within the protection scope of the present application.

Claims

1. A graphene-reinforced porous metal composite pipe lining, characterized in that, The graphene-reinforced porous metal composite pipe lining consists of multiple lining rings connected in sequence. Each of the lining rings is composed of 36 isosceles triangular graphene sheet-reinforced porous metal composite blocks connected to each other. The graphene sheet-reinforced porous metal composite blocks of two adjacent ones are arranged in opposite directions along the length of the graphene sheet-reinforced porous metal composite pipe lining, and the waists of the graphene sheet-reinforced porous metal composite blocks of two adjacent ones are connected to each other. The bottom edges of the graphene sheet-reinforced porous metal composite blocks of two spaced apart are flush and connected to each other. The graphene-reinforced porous metal composite block is composed of graphene and aluminum foam. In two adjacent lining rings, the bottom edges of the graphene sheet-reinforced porous metal composite blocks are connected to each other.

2. The graphene-reinforced porous metal composite pipe lining as described in claim 1, characterized in that, On the cross-section of the graphene-reinforced porous metal composite block, the distribution of the aluminum foam is any one of symmetrical pore distribution, asymmetrical pore distribution, and uniform pore distribution; the distribution of the graphene is any one of symmetrical graphene distribution, asymmetrical graphene distribution, and uniform graphene distribution.

3. The graphene-reinforced porous metal composite pipe lining as described in claim 2, characterized in that, The symmetrical distribution of pores is as follows: in the cross-section, the pores of the aluminum foam decrease from both sides to the middle along the thickness direction of the graphene sheet-reinforced porous metal composite pipe lining.

4. The graphene-reinforced porous metal composite pipe lining as described in claim 2, characterized in that, The asymmetric distribution of pores is as follows: in the cross-section, the pores of the aluminum foam decrease in a gradient from one side to the other along the thickness direction of the graphene sheet-reinforced porous metal composite pipe lining.

5. The graphene-reinforced porous metal composite pipe lining as described in claim 2, characterized in that, The uniform distribution of pores means that, in the cross-section, the pores of adjacent aluminum foams are spaced at equal intervals.

6. The graphene-reinforced porous metal composite pipe lining as described in claim 2, characterized in that, The graphene is symmetrically distributed such that, in the cross-section, the graphene content decreases from both sides to the middle along the thickness direction of the porous metal composite pipe lining reinforced by the graphene sheet.

7. The graphene-reinforced porous metal composite pipe lining as described in claim 2, characterized in that, The graphene asymmetric distribution is such that, in the cross-section, the graphene content decreases gradually from one side to the other along the thickness direction of the porous metal composite pipe lining reinforced by the graphene sheet.

8. The graphene-reinforced porous metal composite pipe lining as described in claim 2, characterized in that, The graphene is uniformly distributed such that adjacent graphene particles are spaced equidistantly in the cross-section.

9. The graphene-reinforced porous metal composite pipe lining as described in claim 2, characterized in that, The aluminum foam is distributed with uniform pores; the graphene is distributed symmetrically.

10. The graphene-reinforced porous metal composite pipe lining according to any one of claims 1-8, characterized in that, The ratio of the height of the graphene-reinforced porous metal composite block to the maximum radius of the graphene-reinforced porous metal composite pipe lining is 0.302.

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