Centrifugal pump spiral flow channel housing structure integrated with wear-resistant coating and manufacturing method thereof

Abstract

The application discloses a centrifugal pump spiral flow channel shell structure integrated with wear-resistant coating and a manufacturing method thereof, relates to the technical field of surface protection of centrifugal pumps, and aims at the problems of easy wear, corrosion and fluid loss of the existing centrifugal pump shell under the scouring of high-speed fluid and solid particles. The application integrates a multilayer composite wear-resistant coating on the inner surface of the spiral flow channel shell, and the coating is sequentially composed of a base layer, a reduced graphene oxide reinforced layer, an intelligent thermal response layer, a self-repairing nano coating and a surface functional coating. The reduced graphene oxide reinforced layer significantly improves the hardness and thermal conductivity of the coating; the intelligent thermal response layer adopts a nickel-titanium alloy powder to realize self-adaptive hardness adjustment according to temperature; the self-repairing nano coating encapsulates a repairing agent through microcapsules to realize self-healing of microcracks; and the surface functional coating is modified by nano particles to regulate fluid behavior. The wear resistance, corrosion resistance, thermal stability and self-repairing capability of the centrifugal pump shell are improved, the service life of the equipment is prolonged, and the maintenance cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of centrifugal pump structural surface protection technology, specifically a centrifugal pump spiral flow channel shell structure with integrated wear-resistant coating and its manufacturing method. Background Technology

[0002] Centrifugal pumps, as core equipment for fluid transportation, are widely used in chemical, metallurgical, mining, power, and municipal water supply industries. In practical applications, the helical flow channel casing of centrifugal pumps is subjected to the scouring of high-speed fluids, the abrasion of solid particles, and the erosion of corrosive media for extended periods. This leads to the gradual wear, corrosion, and peeling of the casing surface material, which not only reduces the pump's hydraulic efficiency and service life but also causes equipment failure, downtime for maintenance, and media leakage, seriously affecting production safety and economic benefits. Especially in conditions involving the transportation of slurry, mineral slurry, high-temperature media, or corrosive media, the wear resistance and corrosion resistance of the casing become key factors restricting the reliable operation of centrifugal pumps.

[0003] In existing technologies, the following methods are mainly used to improve the wear resistance and protective performance of centrifugal pump casings: First, the casing is made of high-hardness alloy materials or special stainless steel, utilizing the material's inherent high hardness and corrosion resistance to resist wear and corrosion. While this method can extend the casing's service life to some extent, high-performance alloy materials are expensive, difficult to process, and have long manufacturing cycles. Furthermore, increased material hardness often comes with decreased toughness, making it prone to cracking or brittle fracture under impact loads, thus unsuitable for complex operating conditions. Second, a single-function polymer coating or cermet coating is applied to the casing surface, providing protection through the coating's hardness and chemical stability. Traditional polymer coatings have certain wear and corrosion resistance, but their hardness and thermal conductivity are poor, making them prone to softening, aging, or peeling under high-temperature or high-speed fluid scouring conditions. Moreover, once damaged, the coating loses its protective function and cannot self-repair. While metal-ceramic coatings offer high hardness and wear resistance, their poor toughness and mismatched coefficient of thermal expansion with the substrate make them prone to cracking or delamination under temperature changes or mechanical stress. Furthermore, their complex and costly manufacturing process makes uniform coating difficult to achieve on complex-shaped spiral flow channel shells. Thirdly, thermal spraying or chemical plating techniques are used to form metal or alloy coatings on the shell surface, utilizing the wear resistance and corrosion resistance of the coating material to protect the substrate. Thermal spraying coatings rely primarily on mechanical interlocking with weaker chemical bonding, resulting in limited adhesion between the coating and the substrate, making them susceptible to peeling under high-speed fluid erosion and particle impact. While chemical plating coatings offer better adhesion, their thickness is limited, their wear resistance is insufficient, and the plating solution causes significant environmental pollution and incurs high treatment costs. Fourthly, localized hardening treatments are applied to the shell surface, such as laser cladding, carburizing, and nitriding, to improve hardness and wear resistance by altering the surface layer's microstructure and phase composition. While these methods can significantly improve the surface hardness of localized areas, they suffer from shallow treatment depth and limited coverage. Furthermore, the heat-affected zone can lead to degradation of the substrate material, resulting in a high surface roughness that increases fluid flow resistance and ultimately reduces hydraulic efficiency. In addition, these technologies cannot achieve diversified control over surface functions, failing to simultaneously meet multiple requirements such as wear resistance, corrosion resistance, thermal conductivity, self-healing, and fluid control.

[0004] Existing technologies improve the wear resistance of the casing through material replacement, single-layer coating protection, thermal spraying, or surface hardening treatment, but they still have certain limitations. For example, a single protective method cannot simultaneously meet the multiple performance requirements of wear resistance, corrosion resistance, thermal conductivity, and toughness, resulting in insufficient comprehensive protection under complex working conditions. The bonding between the coating and the substrate is mainly physical adhesion or mechanical interlocking, with low chemical bonding strength, making it prone to interfacial delamination or peeling under high-speed fluid erosion, temperature stress, and mechanical stress. The coating cannot adaptively adjust its hardness with temperature changes, resulting in large performance fluctuations over a wide temperature range or under variable temperature conditions, making it difficult to maintain optimal protection. Once the coating is damaged, it loses its protective function and cannot self-repair, requiring frequent downtime for maintenance or replacement, leading to high maintenance costs and low production efficiency. The surface wetting properties of the coating cannot be precisely controlled according to application requirements, failing to effectively reduce fluid flow resistance, prevent dirt adhesion, or inhibit cavitation, thus affecting the pump's hydraulic efficiency and operational stability. Existing preparation process parameters have insufficient control precision or are too complex, resulting in poor coating quality consistency, making them unsuitable for large-scale industrial production and application.

[0005] Therefore, there is an urgent need for a centrifugal pump spiral flow channel shell structure and its manufacturing method that can achieve multiple functions such as wear resistance, corrosion resistance, thermal conductivity, temperature adaptive regulation, self-repair, and precise control of fluid behavior through a multi-layer composite coating system. The coating and the substrate form a high-strength interface bond through chemical bonding, which can be used stably for a long time under complex working conditions. The manufacturing process is mature and controllable and suitable for industrial production. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and to propose a centrifugal pump spiral flow channel shell structure with integrated wear-resistant coating and its manufacturing method, so as to solve the above-mentioned problems.

[0007] The objective of this invention is achieved through the following technical solution: a centrifugal pump spiral flow channel housing structure with integrated wear-resistant coating, comprising: The substrate layer is made of stainless steel. The tensile strength of the substrate layer is ≥600 MPa, the fracture toughness is ≥100MPa·m^(1 / 2), the hardness is 150-300 HV, and the surface of the substrate layer is roughened with a surface roughness Ra of 3-6μm. A reduced graphene oxide reinforced composite coating is formed by chemically bonding reduced graphene oxide to the surface of a substrate layer. The reduced graphene oxide has a sheet-like structure with a thickness of 1-5 nanometers. The reduced graphene oxide reinforced composite coating is formed by chemical cross-linking of reduced graphene oxide, thermoplastic polyurethane, and epoxy resin through a condensation reaction. The thickness of the reduced graphene oxide reinforced composite coating is 2-5 μm, the hardness is 0.5-2.0 GPa, the thermal conductivity is 10-30 W / m·K, and the surface friction coefficient is 0.05-0.15. The intelligent thermally responsive coating is applied to the reduced graphene oxide reinforced composite coating and connected by chemical bonding. The intelligent thermally responsive coating is formed by solution blending of nickel-titanium alloy powder and thermoplastic polyurethane. The phase transformation temperature of the nickel-titanium alloy is 60-150°C. The microhardness of the intelligent thermally responsive coating is 200-300 HV at 60°C and 350-450 HV at 150°C. The tensile strength of the thermoplastic polyurethane is 25-35 MPa. The self-healing nano-coating is applied to the intelligent thermal response coating. The self-healing nano-coating contains microcapsules and a polyurethane base liquid. The microcapsules are encapsulated with a liquid polyurethane repair agent. The size of the microcapsules is 10-50 μm and the burst strength is 0.2-0.5 MPa. The viscosity of the liquid polyurethane repair agent is 300-600 mPa·s. The surface functional coating is applied to the surface of the self-healing nano-coating. The surface functional coating is composed of nanoparticles and surface modifiers. The surface functional coating can be selected as superhydrophilic or superhydrophobic according to the application requirements. The water contact angle of the superhydrophilic surface functional coating is 5-10°, and the water contact angle of the superhydrophobic surface functional coating is 150-160°.

[0008] The base layer is made of any one of the following materials: 304 stainless steel, 316 stainless steel, or 2205 duplex stainless steel.

[0009] In the reduced graphene oxide reinforced composite coating, the mass percentage of reduced graphene oxide is 5-15%, the mass percentage of thermoplastic polyurethane is 40-50%, and the mass percentage of epoxy resin is calculated by subtracting the mass percentages of reduced graphene oxide and thermoplastic polyurethane from 100%.

[0010] The thickness of the intelligent thermal response coating is 1-3μm, the mass percentage of nickel-titanium alloy powder in the intelligent thermal response coating is 20-40%, and the phase change response time of the intelligent thermal response coating is 5-30 seconds.

[0011] The microcapsules are composed of an epoxy resin shell with a wall thickness of 0.5-2 μm. The volume fraction of the microcapsules in the self-healing nanocoating is 10-30%, and the self-healing nanocoating has a self-healing time of 2-12 hours after damage.

[0012] The nanoparticles are silica nanoparticles with a particle size of 50-200 nanometers. The thickness of the surface functional coating is 0.5-2 μm, and the surface roughness Ra value of the superhydrophobic surface functional coating is 0.5-3 μm.

[0013] The bonding strength between the reduced graphene oxide reinforced composite coating and the substrate layer, as measured by tensile testing, is 15-25 MPa, and the 90-degree peel strength between the coating layers is 20-30 N / mm.

[0014] A method for manufacturing a centrifugal pump spiral flow channel housing with an integrated wear-resistant coating includes the following steps: S1. Prepare the substrate layer by forming the centrifugal pump spiral flow channel shell by casting, welding or machining of stainless steel material. Sandblast the surface of the substrate layer with a sandblasting pressure of 0.4-0.6 MPa and a sandblasting angle of 60-90° to achieve a surface roughness Ra of 3-6 μm. Then, perform ultrasonic cleaning and drying. S2. Mix reduced graphene oxide, thermoplastic polyurethane, and epoxy resin at a mass percentage of 5-15%, 40-50%, and the remainder, and stir at 80-100°C for 30-60 minutes. Add a crosslinking agent and form a reduced graphene oxide reinforced composite coating mixture through a condensation reaction. Apply the reduced graphene oxide reinforced composite coating mixture to the surface of the substrate layer by spraying, controlling the coating thickness to be 2-5 μm, and cure at 100-120°C for 2-4 hours. S3. Mix nickel-titanium alloy powder with thermoplastic polyurethane solution at a mass ratio of 20-40:60-80, ultrasonically disperse for 15-30 minutes at an ultrasonic power of 200-500 W to form a smart thermal response coating mixture. Apply the smart thermal response coating mixture to the surface of the reduced graphene oxide reinforced composite coating by dip coating, controlling the coating thickness to be 1-3 μm, and dry at 60-80°C for 1-2 hours. S4. Disperse microcapsules containing liquid polyurethane repair agent in polyurethane base liquid, with the volume fraction of microcapsules controlled at 10-30%, and ultrasonically disperse for 10-20 minutes at an ultrasonic power of 200-500 W to form a self-healing nano-coating mixture. Apply the self-healing nano-coating mixture to the surface of the intelligent thermal response coating by spraying, and cure at 20-30°C for 12-24 hours. S5. Nanoparticles are deposited on the surface of the self-healing nanocoating and the surface is modified by radio frequency plasma treatment technology to form a surface functional coating. The plasma treatment power is 100-300 W and the treatment time is 5-15 minutes. For superhydrophilic surface functional coatings, oxygen plasma treatment is used. For superhydrophobic surface functional coatings, perfluorooctyltrichlorosilane or perfluorodecyltrichlorosilane is used for surface modification after deposition.

[0015] In step S2, the spraying pressure is 0.3-0.5 MPa, the spraying distance is 15-25 cm, the spraying speed is 5-10 cm / s, and the substrate layer is kept at 50-80°C during the spraying process.

[0016] In step S5, the radio frequency plasma operates at a frequency of 13.56 MHz and a vacuum level of 10-50 Pa. For superhydrophilic surface functional coatings, the working gas is oxygen with a flow rate of 20-50 sccm. For superhydrophobic surface functional coatings, the working gas is a mixture of argon and tetrafluoromethane, with an argon flow rate of 50-100 sccm and a tetrafluoromethane flow rate of 10-30 sccm.

[0017] The beneficial effects of this invention are: By constructing a five-layer intercalation coating system consisting of a substrate layer, a reduced graphene oxide reinforced composite coating, a smart thermally responsive coating, a self-healing nano-coating, and a surface functional coating, the coatings are chemically bonded together to form a strong interfacial bond. The peel strength between the coating layers is significantly improved, and the bonding strength between the reduced graphene oxide reinforced composite coating and the substrate layer is far higher than that of traditional physically adhered coatings. This high-strength interfacial bond effectively prevents the coating from peeling or detaching under high-speed fluid erosion, particle wear, and temperature stress, ensuring the long-term stability and reliability of the coating system. Test results show that, using a duplex stainless steel substrate and an optimized ratio of reduced graphene oxide reinforced composite coating, the fracture mode is internal fracture rather than interfacial delamination, fully demonstrating that the bonding strength between the coating and the substrate is higher than the coating's own strength, providing a solid mechanical foundation for the application of the coating system under harsh conditions.

[0018] Reduced graphene oxide was used as a reinforcing phase, forming a molecular-level composite with thermoplastic polyurethane and epoxy resin matrices through its unique two-dimensional sheet structure and ultra-high specific surface area. The reduced graphene oxide was uniformly dispersed in the matrix and chemically cross-linked through a condensation reaction, forming a continuous reinforcing network. This molecular-level composite structure resulted in a coating hardness several times higher than that of pure polymer coatings without graphene. Test results showed that optimizing the reduced graphene oxide content significantly increased the coating hardness and significantly reduced the surface friction coefficient, fully demonstrating that optimizing the reduced graphene oxide content can significantly improve the wear resistance of the coating.

[0019] The excellent thermal conductivity of reduced graphene oxide results in a composite coating with a thermal conductivity significantly higher than that of traditional polymer coatings. Test results show that the thermal conductivity of the coating increases significantly with increasing reduced graphene oxide content. This high thermal conductivity effectively conducts the frictional heat and fluid shear heat generated during centrifugal pump operation to the substrate layer and dissipates it outwards, preventing thermal degradation, softening, or cracking caused by localized overheating of the coating. This ensures that the coating maintains stable mechanical and wear resistance under high-temperature conditions. Furthermore, high thermal conductivity reduces the thermal stress gradient between the coating and the substrate, minimizing interfacial stress concentration caused by mismatched coefficients of thermal expansion, further improving the coating's bonding reliability and service life.

[0020] The intelligent thermally responsive coating achieves reversible temperature-dependent hardness adjustment through the martensitic-austenitic phase transformation mechanism of nickel-titanium alloy powder. Nickel-titanium alloys possess shape memory effect and superelasticity, and their phase transformation temperature can be precisely controlled by adjusting the Ni:Ti atomic ratio. At low temperatures, the nickel-titanium alloy is in the martensitic phase, resulting in lower coating hardness while maintaining high toughness and impact resistance. This allows it to absorb the impact energy of particles in the fluid, preventing cracks or indentations on the coating surface. When the temperature rises above the phase transformation temperature, the nickel-titanium alloy transforms into the austenitic phase, significantly increasing the coating hardness. At this point, the coating exhibits stronger wear resistance, effectively resisting the shear stress and abrasive wear of fluids at high temperatures.

[0021] The intelligent thermally responsive coating exhibits low microhardness at low temperatures but increases significantly in hardness at high temperatures, with a short phase transformation response time. Different nickel-titanium alloy ratios can achieve different phase transformation temperatures and hardness adjustment ranges. This rapid response characteristic allows the coating to quickly adapt to temperature fluctuations during centrifugal pump start-up, shutdown, or load changes, consistently maintaining the optimal hardness state matched to the operating conditions.

[0022] The thermally responsive coating and the reduced graphene oxide-reinforced composite coating work together to form a thermal conductivity-tempering synergistic mechanism. The reduced graphene oxide-reinforced coating rapidly conducts heat, enabling the intelligent thermally responsive coating to promptly sense temperature changes and complete phase transitions. Meanwhile, the adjustable hardness of the intelligent thermally responsive coating reduces frictional heat generation at high temperatures, alleviating the heat dissipation burden on the reduced graphene oxide-reinforced coating. This synergistic effect allows the coating system to maintain excellent wear resistance and mechanical stability over a wide temperature range, significantly expanding the applicable operating conditions of centrifugal pumps, making it particularly suitable for applications involving high-temperature media, variable temperature conditions, or frequent thermal shocks.

[0023] Microencapsulation technology is used to encapsulate liquid polyurethane repair agent within microcapsules of appropriate size and burst strength, which are then uniformly dispersed in a polyurethane base liquid to form a self-healing nano-coating. When the coating surface is subjected to wear, scratches, or impacts, resulting in microcracks, stress concentration at the crack tip causes the microcapsules to rupture. The encapsulated liquid polyurethane repair agent flows into the crack under capillary action and pressure, where it solidifies with moisture from the air or water source, filling the crack and restoring the coating's integrity. This self-healing process requires no external intervention and occurs spontaneously during the coating's service life, effectively preventing further crack propagation and preventing the cracks from evolving into macroscopic damage.

[0024] The synergistic effect of the self-healing nano-coating and the intelligent thermally responsive coating further enhances the self-healing effect. Under high-temperature conditions, the increased hardness of the intelligent thermally responsive coating reduces the frequency of wear and scratches on the coating surface, lowering the workload of the self-healing coating. Meanwhile, the self-healing coating can promptly repair microcracks caused by temperature or mechanical stress, preventing cracks from propagating downwards to the intelligent thermally responsive coating or the reduced graphene oxide-reinforced composite coating, thus protecting the structural integrity of the underlying coating layer. Furthermore, the presence of the self-healing coating can seal micropores and defects on the coating surface, preventing corrosive media from penetrating inwards and improving the coating's corrosion resistance. Combining these synergistic effects, the self-healing nano-coating significantly extends the service life of the entire coating system compared to traditional coatings, significantly reducing maintenance costs and downtime.

[0025] A nano-roughened structure was constructed on the surface of a self-healing nanocoating using silica nanoparticles of appropriate size via radio frequency plasma-enhanced chemical vapor deposition (RF plasma-enhanced chemical vapor deposition). The surface was then modified with perfluorooctyltrichlorosilane (PFOTS) or perfluorodecyltrichlorosilane to introduce low-surface-energy perfluoroalkyl groups. This dual strategy of micro / nano-roughened structure combined with low-surface-energy chemical modification resulted in randomly distributed protrusions and depressions at the μm scale and a dense array of nanoparticles at the nanoscale, forming a multi-level composite roughened structure. According to the Cassie-Baxter model, this multi-level structure can introduce a large amount of air at the solid-liquid interface, allowing water droplets to remain at the top of the protrusions in a point-contact manner, resulting in an extremely small solid-liquid contact area and thus achieving a superhydrophobic effect.

[0026] Silica nanoparticles of appropriate particle size were prepared via a sol-gel method, and then a large number of hydroxyl groups (-OH) were introduced onto the surface of the nanoparticles by oxygen plasma bombardment. These hydroxyl groups are highly hydrophilic and can form hydrogen bonds with water molecules, allowing water to spread rapidly on the surface and form a continuous water film. Test results show that the superhydrophilic surface functional coating has an extremely small water contact angle, a very short water spreading time, and an appropriate surface roughness. This superhydrophilic property enables the fluid to form a uniform lubricating water film on the shell surface, reducing direct contact between the fluid and the solid surface, lowering frictional resistance and wear, making it particularly suitable for conveying fluids containing solid particles or high viscosity. Simultaneously, the superhydrophilic surface effectively prevents the adhesion and accumulation of bubbles, avoiding cavitation and protecting the coating and substrate from cavitation damage.

[0027] The synergistic effect of surface functional coatings and self-healing nanocoatings further enhances the overall performance of the coating system. The self-healing coating can promptly repair microcracks beneath the surface functional coating, preventing crack propagation and damage to the surface micro / nano structure, thus maintaining the long-term stability of the surface functional coating's superhydrophobic or superhydrophilic properties. Simultaneously, the surface functional coating reduces fluid resistance and wear, decreasing the damage frequency of the self-healing coating, lowering the consumption rate of the repair agent, and extending the effective lifespan of the self-healing function. This bidirectional synergy ensures that the coating system maintains excellent fluid control and protective performance throughout long-term service.

[0028] Sandblasting roughens the substrate surface to achieve an appropriate surface roughness. Process parameters show that using appropriate mesh size, pressure, and angle of the sandblasting medium ensures precise control of surface roughness after sandblasting. This roughening process significantly increases the specific surface area of ​​the substrate, providing mechanical anchoring points for the coating. Simultaneously, the micro-pits on the roughened surface can accommodate coating material, enhancing the bonding strength between the coating and the substrate through mechanical interlocking. Ultrasonic cleaning, using anhydrous ethanol solvent, at appropriate ultrasonic frequency, power, and cleaning time, thoroughly removes residual sandblasting media particles and oil contaminants from the surface, ensuring a clean interface between the coating and the substrate and preventing impurities from interfering with chemical bonding.

[0029] High-pressure airless spraying technology is used to uniformly coat the substrate surface with a coating mixture, employing appropriate spraying pressure, distance, and speed. Advanced high-pressure airless spraying equipment is used, maintaining the substrate surface temperature within a suitable range during the spraying process. This spraying process allows for precise control of coating thickness, resulting in high coating uniformity and preventing stress concentration and localized failure caused by uneven thickness. Curing at a suitable temperature for a specific time, with precise control of the heating rate, allows the epoxy groups in the epoxy resin to undergo a condensation reaction with the amino groups in diaminodiphenylmethane (DDM), forming a three-dimensional cross-linked network. Simultaneously, reduced graphene oxide reacts chemically with the epoxy resin through its surface hydroxyl and carboxyl groups, achieving molecular-level composite formation. Slow heating and thorough curing prevent rapid solvent evaporation that could lead to coating bubbles, pinholes, or cracking, ensuring the coating's density and integrity.

[0030] The coating mixture is applied to the surface of the reduced graphene oxide-reinforced composite coating using dip-coating technology, with appropriate immersion time and pull-up speed. Compared to spraying, dip-coating achieves a more uniform coating thickness, making it particularly suitable for complex-shaped spiral flow channel shells. Drying at a suitable temperature for a certain time allows the solvent to evaporate slowly, ensuring uniform distribution of the nickel-titanium alloy powder within the thermoplastic polyurethane matrix and preventing particle sedimentation or agglomeration. Before use, the nickel-titanium alloy powder undergoes surface activation treatment, involving ultrasonic treatment with an acid solution of appropriate concentration to remove the surface oxide layer, improve the interfacial bonding strength between the powder and the polyurethane matrix, and ensure effective stress transfer during the phase transformation process.

[0031] Microcapsules were prepared via in-situ polymerization, encapsulating liquid polyurethane repair agents within an epoxy resin shell. Process parameters indicated that high-speed shearing formed an emulsion, followed by reaction at an appropriate temperature for a specific time, yielding microcapsules with suitable particle size and wall thickness. After dispersing the microcapsules in a polyurethane base liquid, they were coated onto the surface of a smart thermally responsive coating using low-pressure spraying. Appropriate spraying pressure, nozzle orifice diameter, and spraying distance were employed, with precise temperature control to prevent premature microcapsule rupture or excessively rapid curing of the polyurethane base liquid. After static curing at room temperature and appropriate relative humidity for a certain period, the isocyanate and hydroxyl groups in the polyurethane base liquid reacted slowly, forming a cross-linked network that firmly encapsulated the microcapsules within the coating, ensuring the stability and responsiveness of the microcapsules during the coating's service life.

[0032] A radio frequency plasma-enhanced chemical vapor deposition (RF plasma-enhanced chemical vapor deposition) technique was employed to deposit nanoparticles and modify the surface of a self-healing nanocoating. Appropriate operating frequencies, RF power, vacuum levels, and processing times were used. Advanced RF plasma-enhanced chemical vapor deposition equipment was utilized, employing a mixed gas of argon and tetrafluoromethane with precise flow rate control, and optimized electrode spacing and substrate temperature settings. Silica nanoparticles were delivered to the plasma region via a powder feeder with precisely controlled feed rate, depositing on the self-healing nanocoating surface under plasma irradiation to form a nano-roughened structure. Immediately after plasma deposition, perfluorooctyltrichlorosilane (PFOTS) was introduced into a suitable solvent for surface modification via dip coating. Dip time and pull-out speed were precisely controlled, followed by curing at an appropriate temperature for a specific time, allowing the silane coupling agent to react with the hydroxyl groups on the silica surface to form a hydrophobic perfluoroalkyl layer. The entire process parameters were precise, and the steps were clearly defined, making it suitable for large-scale industrial production. Attached Figure Description

[0033] Figure 1 This is a structural diagram of the housing of the present invention; Figure 2 The coating manufacturing process of the present invention Figure 1 ; Figure 3 The coating manufacturing process of the present invention Figure 2 . Detailed Implementation

[0034] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] It should be noted that the directional concepts of left, right, up, down, front, back, inside, and outside in the following scheme are all relative directions, and will not be listed one by one here.

[0036] Example 1 like Figure 1 As shown, this embodiment provides a centrifugal pump spiral flow channel housing structure with integrated wear-resistant coating. This structure includes a substrate layer, a reduced graphene oxide reinforced composite coating, a smart thermally responsive coating, a self-healing nano-coating, and a surface functional coating. The substrate layer is made of 316 stainless steel, with a tensile strength of [missing information]. Fracture toughness is Hardness is The substrate surface has been roughened to reduce its surface roughness. for The roughening process employs sandblasting with brown fused alumina as the blasting medium, a particle size of 60 mesh, and a blasting pressure of [pressure value missing]. The sandblasting angle is Sandblasting time is After roughening treatment, the substrate surface is ultrasonically cleaned using anhydrous ethanol as the cleaning solvent, and the cleaning time is [duration missing]. Then Drying under conditions .

[0037] A reduced graphene oxide-reinforced composite coating is deposited on the surface of the substrate layer and bonded together by chemical bonding. The reduced graphene oxide is prepared using a hydrazine hydrate chemical reduction method at a reduction temperature of [temperature missing]. The restoration time is The prepared reduced graphene oxide has a layered structure, and the layer thickness was measured to be [missing information - likely a value]. The horizontal dimension is The specific formulation of the reduced graphene oxide reinforced composite coating is as follows: 10% by mass of reduced graphene oxide, 45% by mass of thermoplastic polyurethane (TPU-1185A), and 45% by mass of epoxy resin (E-51). During preparation, the above three components are mixed in dimethylformamide (DMF) solvent. Stirring under conditions The stirring speed is The added crosslinking agent is diaminodiphenylmethane (DDM), used at 12% of the epoxy resin mass. A reduced graphene oxide-reinforced composite coating is formed through chemical crosslinking via a condensation reaction. The thickness of this coating is... The hardness was measured to be [value missing] using a microhardness tester. (Loading force) Holding time The thermal conductivity was measured using the laser flash method. (Test temperature) The surface friction coefficient was measured using a ball-disc friction tester. (The grinding material is GCr15 steel balls, and the load is...) Rotation speed Test time ).

[0038] A smart thermally responsive coating is deposited on a reduced graphene oxide-reinforced composite coating and chemically bonded together. This coating is formed by solution blending of nickel-titanium alloy powder and thermoplastic polyurethane. The nickel-titanium alloy powder (Ni:Ti atomic ratio 50.8:49.2) comprises 30% by mass, and the thermoplastic polyurethane (grade TPU-1185A) comprises 70% by mass. The particle size of the nickel-titanium alloy powder is [missing information]. The phase transition temperature was measured by differential scanning calorimetry (DSC). Enthalpy of phase transition The thickness of the intelligent thermal response coating is... Microhardness is measured using a microhardness tester (under applied force). Holding time ):exist At that time ,exist At that time The tensile strength of thermoplastic polyurethane was measured using a universal testing machine. (stretch rate) The sample dimensions conform to GB / T 1040 standard. The phase transition response time was measured by a temperature step experiment. (from Heat up to ).

[0039] A self-healing nano-coating is applied to a smart thermally responsive coating. This coating comprises microcapsules and a polyurethane-based liquid, with the microcapsules encapsulating a liquid polyurethane repair agent. The microcapsules are composed of an epoxy resin shell with a wall thickness of [missing information]. The microcapsules were measured using an optical microscope and particle size analyzer, with an average size of [missing information]. Size distribution range is The burst strength of the microcapsules was measured using a micromechanical testing system. The liquid polyurethane repair agent is an isocyanate-terminated polyurethane prepolymer, measured by a rotational viscometer. Rotation speed ), viscosity is The microcapsules comprise 20% of the self-healing nanocoating by volume. The polyurethane base is a two-component polyurethane system, with component A being a polyether polyol and component B being an isocyanate curing agent, with a mass ratio of A:B of 10:3.

[0040] A surface functional coating is applied to the surface of the self-healing nanocoating and consists of nanoparticles and surface modifiers. The nanoparticles are silica nanoparticles (prepared using a vapor phase method), and the average particle size is measured by transmission electron microscopy (TEM). The thickness of the surface functional coating is... Based on application requirements, this embodiment selects a superhydrophobic surface functional coating. This coating uses perfluorooctyltrichlorosilane (PFOTS) as a surface modifier, with a mass ratio of modifier to silica nanoparticles of 1:10. The droplet volume was measured using a contact angle meter. Measurement time The water contact angle is The roll angle is Surface roughness was measured using atomic force microscopy (AFM). Value .

[0041] The bonding strength between the reduced graphene oxide reinforced composite coating and the substrate layer was measured by tensile testing. (Test method refers to ASTM D4541 standard, tensile rate) The 90-degree peel strength between the coating layers was measured using a peel tester. (peeling rate) The test method follows ASTM D6862 standard. To verify the self-healing function, a width of [missing information] was artificially created on the surface of the self-healing nano-coating. Depth is The scratches, in The sample was left to stand under conditions of 60% relative humidity. Observation using an optical microscope and a scanning electron microscope (SEM) revealed that the scratches... After complete restoration, the surface morphology of the restored area is basically the same as that of the undamaged area.

[0042] The centrifugal pump spiral flow channel housing structure with integrated wear-resistant coating provided in this embodiment can significantly improve the centrifugal pump's wear resistance, thermal response, repairability, and fluid control performance, adapting to complex industrial application environments and exhibiting a long service life and high reliability.

[0043] Example 2 like Figure 1 and Figure 2 As shown, this embodiment provides another centrifugal pump spiral flow channel housing structure with integrated wear-resistant coating. The focus is on using different material ratios and coating parameters, as well as detailed interlayer bond strength testing methods, to verify the performance of the coating system under different configurations. The substrate layer is made of 2205 duplex stainless steel, which has a tensile strength of [missing information]. Fracture toughness is Hardness is The substrate surface was roughened by sandblasting with white corundum as the blasting medium, with a particle size of 80 mesh, and a sandblasting pressure of [pressure value missing]. The sandblasting angle is Surface roughness after treatment for .

[0044] The formulation of the reduced graphene oxide-reinforced composite coating differs from that in Example 1. In this example, the mass percentage of reduced graphene oxide is 12%, the mass percentage of thermoplastic polyurethane (TPU-1190A) is 42%, and the mass percentage of epoxy resin (E-44) is 46%. The reduced graphene oxide is prepared using the ascorbic acid reduction method at a reduction temperature of [temperature missing]. The restoration time is The sheet thickness was measured by AFM. The coating thickness is Hardness is (Loading force) Holding time Thermal conductivity is The surface friction coefficient is (The grinding material is) Ceramic spheres, load Rotation speed ).

[0045] The intelligent thermally responsive coating employs different nickel-titanium alloy ratios. In this embodiment, the mass percentage of nickel-titanium alloy powder (Ni:Ti atomic ratio of 51.5:48.5) is 35%, and the mass percentage of thermoplastic polyurethane is 65%. The particle size of the nickel-titanium alloy powder is... The phase transition temperature was measured by DSC as follows: Enthalpy of phase transition The thickness of the intelligent thermal response coating is... Microhardness in At that time ,exist At that time The phase transition response time is .

[0046] In the self-healing nano-coating, the microcapsules use a polyurea-formaldehyde resin composite shell with a wall thickness of [missing information]. The average size of the microcapsules is Size distribution range is The fracture strength was measured using a nanoindenter. The liquid polyurethane repair agent uses a multifunctional isocyanate system with a viscosity of [missing information]. ( Rotation speed The microcapsule volume fraction is 25%. The polyurethane base liquid uses a polyester polyol and HDI (hexamethylene diisocyanate) curing agent system in a ratio of 10:4. The self-healing nano-coating has a self-healing time of [time missing] after damage. (Ambient temperature) (Relative humidity 50%). Atomic force microscopy (AFM) and nanoindentation tests showed that the Young's modulus of the repaired area recovered to 92% of its original value, and the hardness recovered to 88% of its original value.

[0047] Unlike Example 1, this example uses a superhydrophilic surface functional coating. The nanoparticles are silica nanoparticles (prepared using the sol-gel method), with an average particle size of [missing information]. The results were confirmed by TEM and dynamic light scattering (DLS) measurements. Surface modification involved hydroxylation, where hydroxyl groups were introduced onto the silica surface via oxygen plasma bombardment. The coating thickness was [missing information]. The water contact angle, as measured by a contact angle meter, is [value missing]. The time it takes for water to spread on the surface is less than Surface roughness Value .

[0048] The bonding strength test between the reduced graphene oxide reinforced composite coating and the substrate layer was conducted according to the following method: A coating was prepared on the substrate surface according to the above formula, cured, and then cut into sections. Square specimens were prepared. An aluminum alloy tensile clamp was bonded to the coated surface using epoxy structural adhesive (grade JN-C312) and allowed to cure. A universal testing machine (model Instron 5985) was used, with the tensile rate set to... A tensile force is applied perpendicular to the coating surface, and the maximum tensile force at which the coating peels off is recorded. Bond strength is calculated using the formula: in For bonding strength, For maximum tension, [This represents the coating area.] Test results show that the bonding strength is [value missing]. The fracture mode is internal fracture within the coating, indicating that the bonding strength between the coating and the substrate is higher than the strength of the coating itself.

[0049] The 90-degree peel strength test method between coating layers is as follows: Each coating layer is prepared sequentially on the substrate layer, and a polyimide film (thickness...) is bonded to the outermost surface. The tensile layer was used as the peel test layer. A peel testing machine (Instron 5944) was used, with a peel angle of 90 degrees and a peel rate of [missing information]. Record the force-displacement curves during the peeling process. Peel strength is calculated using the formula: in For peel strength, This represents the average peeling force. The width of the sample ( The test result showed a 90-degree peel strength of [value missing]. The peeling process was smooth, with no sudden delamination.

[0050] Compared to Example 1, this example uses a higher proportion of reduced graphene oxide (12% vs 10%), resulting in a 33% increase in coating hardness. vs Thermal conductivity increased by 33% ( vs The coefficient of friction is reduced by 20%. vs The microcapsule volume fraction of the self-healing coating is increased to 25%, and the repair time is extended to [missing information]. However, the mechanical properties are more fully restored after repair. This embodiment demonstrates that by adjusting the coating ratio and process parameters, an optimal balance can be achieved between wear resistance, thermal conductivity, and self-healing ability to meet application requirements under different working conditions.

[0051] Example 3 like Figures 1 to 3 As shown, this embodiment details the complete process flow for manufacturing the centrifugal pump spiral flow channel housing structure with integrated wear-resistant coating as described in Embodiment 1. First, 316 stainless steel sheet (thickness...) is selected. The composition conforms to GB / T20878 standards, and the basic shape of the centrifugal pump spiral flow channel shell is machined by a CNC machining center. The outer diameter of the machined substrate layer is [missing information]. The internal flow channel helix angle is The channel width is The surface roughening process employed sandblasting, using a sandblasting machine (model KS-9060) with brown fused alumina as the blasting medium, a particle size of 60 mesh, and a sandblasting pressure set to [value missing]. The angle between the sandblasting gun and the substrate surface should be maintained. Sandblasting distance is The sandblasting speed is During sandblasting, the surface temperature of the substrate is controlled at... To avoid thermal deformation, the surface roughness was measured using a surface roughness meter (model Mitutoyo SJ-410) after sandblasting. for .

[0052] The sandblasted substrate layer is immersed in an ultrasonic cleaning tank (model KQ-500DE), and the cleaning solvent is anhydrous ethanol (purity). ), ultrasonic frequency is The ultrasonic power is The cleaning time is During the cleaning process, every Replace the solvent once to ensure complete removal of any residual particles from the surface. Place the cleaned substrate layer in a hot air drying oven (model DHG-9240A) and set the drying temperature to [temperature value missing]. The drying time is After drying, proceed immediately to the next coating step to avoid surface oxidation.

[0053] In preparing the reduced graphene oxide-reinforced composite coating, graphene oxide was first prepared using the modified Hummers method, and then reduced graphene oxide was prepared using the hydrazine hydrate chemical reduction method. Specific steps: Graphene oxide (concentration...) The aqueous dispersion was heated to... Add hydrazine hydrate (in an amount 10 times the mass of graphene oxide) to maintain reduction reaction After the reaction is complete, it is centrifuged (speed...). ,time Washing (washed 5 times with deionized water), freeze drying (temperature) vacuum degree ,time Reduced graphene oxide powder was obtained. The reduced graphene oxide powder ( ), thermoplastic polyurethane granules (brand name TPU-1185A, ), epoxy resin (brand name E-51, Add dimethylformamide (DMF) In solvent. Under these conditions, use a mechanical stirrer (speed) Stir Ensure all components are thoroughly mixed. Then add the crosslinking agent diaminodiphenylmethane (DDM), at a dosage of 12% of the epoxy resin mass, i.e. Continue stirring. .

[0054] Next, a high-pressure airless spraying device (model Graco UltraMax 695) was used, with the spraying pressure set to [value missing]. The nozzle orifice diameter is Spraying distance is The spraying speed is During the spraying process, the surface temperature of the substrate layer is maintained at... (Controlled by a heating table). Spraying employs a reciprocating, uniform application method to ensure consistent coating thickness. After spraying, the coating thickness is measured using an eddy current thickness gauge (Fischer FMP100) and controlled within [specific parameters]. Place the sprayed substrate layer in a forced-air drying oven and set the curing temperature to [temperature value missing]. The curing time is During the curing process, the heating rate is controlled as follows: This is to avoid rapid temperature increases that could cause the coating to crack.

[0055] For intelligent thermal response coatings, the raw material is nickel-titanium alloy powder (Ni:Ti atomic ratio of 50.8:49.2, particle size...). Surface activation treatment is required before use. Immerse the powder in a 10% HCl solution and sonicate. Then wash with deionized water until neutral, and vacuum dry. , The pretreated nickel-titanium alloy powder ( ) and thermoplastic polyurethane (brand name TPU-1185A, Dissolved in dimethylformamide (DMF) In the solution, a suspension is formed. An ultrasonic dispersion device (model Scientz-IID, ultrasonic power) is used. Ultrasonic dispersion To ensure uniform dispersion of the nickel-titanium alloy powder without significant agglomeration, a dip-coating device (model PTL-MM01) was used. The substrate layer coated with the reduced graphene oxide reinforced composite coating was immersed in the intelligent thermal response coating mixture for a duration of [duration missing]. The lifting speed is set to After dip coating, a uniform liquid film appeared on the coating surface, without obvious sagging or bubbles. The dip-coated substrate layer was then suspended in a drying oven, and the drying temperature was set to [temperature missing]. The drying time is Maintain air circulation during the drying process to prevent uneven solvent evaporation that could lead to coating defects. After drying, the coating thickness is measured using an eddy current thickness gauge. .

[0056] Subsequently, microcapsules encapsulating the liquid polyurethane repair agent were prepared using in-situ polymerization. The liquid polyurethane repair agent (isocyanate-terminated polyurethane prepolymer) was then... ) dispersed in an aqueous solution containing an emulsifier (polyvinyl alcohol, 3% concentration) In high-speed shearing (rotation speed) ,time An emulsion is formed. Then, an epoxy resin prepolymer ( ) and curing agent (triethanolamine, ),exist reaction under conditions Microcapsules are formed. After the reaction is complete, the microcapsule powder is obtained by filtration, washing, and drying. The average particle size of the microcapsules is determined by optical microscopy and particle size analyzer to be [value missing]. The wall thickness is The prepared microcapsule powder ( (Approximately 20% by volume) dispersed in the polyurethane base liquid (component A, polyether polyol) Component B isocyanate curing agent ,total In this process, ultrasonic dispersion equipment (ultrasonic power) is used. Ultrasonic dispersion This ensures the microcapsules are uniformly dispersed and do not rupture. A low-pressure spraying device (Fuji T75G) is used, with the spraying pressure set to [value missing]. The nozzle orifice diameter is Spraying distance is The spraying speed is During the spraying process, the spraying temperature is controlled at... To avoid excessively high temperatures that could cause premature rupture of the microcapsules or excessively rapid curing of the polyurethane base liquid, the sprayed substrate layer should be kept at room temperature (…). Curing is carried out in an environment with a relative humidity of 60%. During the curing process, the isocyanate groups and hydroxyl groups in the polyurethane base react to form a cross-linked network, which firmly encapsulates the microcapsules in the coating.

[0057] Finally, silica nanoparticles (average particle size) were prepared using a vapor phase method. Before use, the nanoparticles are placed in... Drying under certain conditions To remove surface-adsorbed moisture, a radio frequency plasma-enhanced chemical vapor deposition system (model PlasmaLab System 100) was used, operating at a frequency of [missing information]. RF power vacuum degree The working gas is argon (flow rate) The reacting gas is tetrafluoromethane ( ,flow Processing time Electrode spacing Matrix temperature During the processing, silica nanoparticles are introduced through a powder injector (injection rate...) The plasma is transported to the plasma region and deposited on the surface of the self-healing nanocoating under the action of plasma, forming a nano-rough structure. Surface modification is performed immediately after plasma deposition. Perfluorooctyltrichlorosilane (PFOTS) is then applied. Dissolved in n-hexane ( A modification solution is prepared by mixing the substrate layer with the modification solution. The substrate layer is then immersed in the modification solution using a dip-coating method for a duration of [duration missing]. The lifting speed is After dipping, in Curing under certain conditions This process allows the silane coupling agent to react with the hydroxyl groups on the silica surface, forming a hydrophobic perfluoroalkyl layer. The water contact angle of the surface functional coating was measured using a contact angle meter (Model Dataphysics OCA20). The roll angle is Surface roughness was measured using an atomic force microscope (model Bruker Dimension Icon). Value The coating thickness was measured using an eddy current thickness gauge. .

[0058] Quality inspection and performance testing include coating thickness measurement, adhesion testing, hardness testing, abrasion resistance testing, self-healing performance testing, and thermal response performance testing. An eddy current thickness gauge is used, with 10 measurement points evenly selected on the substrate surface to measure the total coating thickness. The pass / fail standard is the total thickness. The cross-cut method (refer to GB / T 9286 standard) is used to score the coating surface. Grid, grid spacing Use adhesive tape to quickly peel off the surface; the acceptable standard is that the peeled area does not exceed 5%. Use a microhardness tester (load tester). Holding time The surface hardness of the coating is measured, and the pass standard is surface hardness. A reciprocating friction and wear testing machine (model MFT-5000) was used, with GCr15 steel balls (diameter...) as the grinding material. ), load reciprocating frequency ,journey Test time After testing, the depth and width of the wear tracks were measured using a surface profilometer, and the wear amount was calculated using a weighing method. The test result is the wear track depth. Wear amount A Vickers hardness tester was used to apply a hardness tester to the coating surface. Loading creates microcracks. Place in an environment with a relative humidity of 60% Subsequently, the cracked area was observed using a scanning electron microscope (SEM, model Zeiss Sigma 300). Test results showed that the crack was completely repaired, and there was no significant difference between the repaired and undamaged areas. The coated samples were then placed... and Insulation in constant temperature chamber Then, the coating hardness was quickly measured, and the test result was... The hardness is , The hardness is Response time .

[0059] Through the above process, a centrifugal pump spiral flow channel housing with integrated wear-resistant coating was successfully prepared. The coating system exhibits excellent wear resistance, thermal responsiveness, self-healing ability, and surface functionality, with all performance indicators meeting design requirements. This manufacturing method is mature, with controllable parameters and stable quality, making it suitable for industrial production applications.

[0060] The above description is merely a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the concept described herein through the above teachings or related technologies or knowledge. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A centrifugal pump spiral flow channel housing structure with integrated wear-resistant coating, characterized in that, include: The substrate layer is made of stainless steel and has a tensile strength ≥600 MPa, a fracture toughness ≥100 MPa·m^(1 / 2), and a hardness of 150-300 HV. The surface of the substrate layer is roughened and has a surface roughness Ra of 3-6 μm. A reduced graphene oxide reinforced composite coating is disposed on the surface of the substrate layer and connected by chemical bonding. The reduced graphene oxide has a sheet-like structure with a thickness of 1-5 nanometers. The reduced graphene oxide reinforced composite coating is formed by chemical crosslinking of the reduced graphene oxide, thermoplastic polyurethane, and epoxy resin through a condensation reaction. The thickness of the reduced graphene oxide reinforced composite coating is 2-5 μm, the hardness is 0.5-2.0 GPa, the thermal conductivity is 10-30 W / m·K, and the surface friction coefficient is 0.05-0.

15. A smart thermally responsive coating is disposed on the reduced graphene oxide reinforced composite coating and connected by chemical bonding. The smart thermally responsive coating is formed by solution blending of nickel-titanium alloy powder and thermoplastic polyurethane. The phase transformation temperature of the nickel-titanium alloy is 60-150°C. The microhardness of the smart thermally responsive coating is 200-300 HV at 60°C and 350-450 HV at 150°C. The tensile strength of the thermoplastic polyurethane is 25-35 MPa. The self-healing nano-coating is disposed on the intelligent thermal response coating. The self-healing nano-coating comprises microcapsules and a polyurethane base liquid. The microcapsules encapsulate a liquid polyurethane repair agent. The size of the microcapsules is 10-50 μm, the burst strength is 0.2-0.5 MPa, and the viscosity of the liquid polyurethane repair agent is 300-600 mPa·s. A surface functional coating is disposed on the surface of the self-healing nano-coating. The surface functional coating is composed of nanoparticles and surface modifiers. The surface functional coating is selected as superhydrophilic or superhydrophobic according to application requirements. The water contact angle of the superhydrophilic surface functional coating is 5-10°, and the water contact angle of the superhydrophobic surface functional coating is 150-160°.

2. The centrifugal pump spiral flow channel housing structure with integrated wear-resistant coating according to claim 1, characterized in that, The substrate layer is made of any one of the following materials: 304 stainless steel, 316 stainless steel, and 2205 duplex stainless steel.

3. The centrifugal pump spiral flow channel housing structure with integrated wear-resistant coating according to claim 1, characterized in that, The reduced graphene oxide reinforced composite coating has a mass percentage of 5-15% for reduced graphene oxide and a mass percentage of 40-50% for thermoplastic polyurethane. The mass percentage of epoxy resin is calculated by subtracting the mass percentages of reduced graphene oxide and thermoplastic polyurethane from 100%.

4. The centrifugal pump spiral flow channel housing structure with integrated wear-resistant coating according to claim 3, characterized in that, The thickness of the intelligent thermal response coating is 1-3 μm, the mass percentage of the nickel-titanium alloy powder in the intelligent thermal response coating is 20-40%, and the phase change response time of the intelligent thermal response coating is 5-30 seconds.

5. The centrifugal pump spiral flow channel housing structure with integrated wear-resistant coating according to claim 4, characterized in that, The microcapsules are made of an epoxy resin shell with a wall thickness of 0.5-2 μm. The volume fraction of the microcapsules in the self-healing nanocoating is 10-30%, and the self-healing nanocoating has a self-healing time of 2-12 hours after damage.

6. The centrifugal pump spiral flow channel housing structure with integrated wear-resistant coating according to claim 5, characterized in that, The nanoparticles are silica nanoparticles with a particle size of 50-200 nanometers. The thickness of the surface functional coating is 0.5-2 μm, and the surface roughness Ra value of the superhydrophobic surface functional coating is 0.5-3 μm.

7. The centrifugal pump spiral flow channel housing structure with integrated wear-resistant coating according to claim 1, characterized in that, The bonding strength between the reduced graphene oxide reinforced composite coating and the substrate layer, as measured by tensile testing, is 15-25 MPa, and the 90-degree peel strength between the coating layers is 20-30 N / mm.

8. A method for manufacturing a centrifugal pump spiral flow channel housing with an integrated wear-resistant coating according to claim 1, characterized in that, Includes the following steps: S1. Prepare the substrate layer by forming a centrifugal pump spiral flow channel shell from stainless steel material through casting, welding, or machining. Sandblast the surface of the substrate layer with a sandblasting pressure of 0.4-0.6 MPa and a sandblasting angle of 60-90° to achieve a surface roughness Ra of 3-6 μm. Then, perform ultrasonic cleaning and drying. S2. Mix reduced graphene oxide, thermoplastic polyurethane, and epoxy resin in a mass percentage of 5-15%, 40-50%, and the remainder, and stir at 80-100°C for 30-60 minutes. Add a crosslinking agent and form a reduced graphene oxide reinforced composite coating mixture through a condensation reaction. Apply the reduced graphene oxide reinforced composite coating mixture to the surface of the substrate layer by spraying, controlling the coating thickness to be 2-5 μm, and cure at 100-120°C for 2-4 hours. S3. Mix nickel-titanium alloy powder with thermoplastic polyurethane solution at a mass ratio of 20-40:60-80, ultrasonically disperse for 15-30 minutes at an ultrasonic power of 200-500 W to form a smart thermal response coating mixture. Apply the smart thermal response coating mixture to the surface of the reduced graphene oxide reinforced composite coating by dip coating, controlling the coating thickness to be 1-3 μm, and dry at 60-80°C for 1-2 hours. S4. Disperse microcapsules containing liquid polyurethane repair agent in polyurethane base liquid, wherein the volume fraction of the microcapsules is controlled at 10-30%, and ultrasonically disperse for 10-20 minutes at an ultrasonic power of 200-500 W to form a self-healing nano-coating mixture. Apply the self-healing nano-coating mixture to the surface of the intelligent thermal response coating by spraying, and cure at 20-30°C for 12-24 hours. S5. Nanoparticles are deposited on the surface of the self-healing nanocoating and surface modified by radio frequency plasma treatment technology to form a surface functional coating. The plasma treatment power is 100-300 W and the treatment time is 5-15 minutes. For superhydrophilic surface functional coatings, oxygen plasma treatment is used. For superhydrophobic surface functional coatings, perfluorooctyltrichlorosilane or perfluorodecyltrichlorosilane is used for surface modification after deposition.

9. The manufacturing method according to claim 8, characterized in that, In step S2, the spraying pressure is 0.3-0.5 MPa, the spraying distance is 15-25 cm, the spraying speed is 5-10 cm / s, and the substrate layer is maintained at 50-80°C during the spraying process.

10. The manufacturing method according to claim 8, characterized in that, The radio frequency plasma in step S5 operates at a frequency of 13.56 MHz and a vacuum level of 10-50 Pa. For superhydrophilic surface functional coatings, the working gas is oxygen with a flow rate of 20-50 sccm. For superhydrophobic surface functional coatings, the working gas is a mixture of argon and tetrafluoromethane, with an argon flow rate of 50-100 sccm and a tetrafluoromethane flow rate of 10-30 sccm.

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