A wind turbine metal wear repair material, a preparation method and application thereof

Abstract

The present application relates to the technical field of metal wear repair materials, and particularly relates to a wind turbine metal wear repair material, a preparation method and application thereof, raw materials include, by weight, 7-11 parts of a graphene-based reinforcing agent, 4-7 parts of a modified lanthanum agent, 15-25 parts of a binder, 3-6 parts of a curing agent, 2-5 parts of a diluent, 1-3 parts of a cold and hot cycle resistance agent and 0.5-1.2 parts of a corrosion resistance agent. The graphene-based reinforcing agent is modified by oxidation activation, strengthening liquid compounding and synergist ball milling, and the modified lanthanum agent is modified by double liquid modification of nano hexagonal boron nitride and carbon nanotubes, so that the dispersibility and mechanical adaptability of lanthanum oxide are optimized, and the problems of impact toughness, strength, fatigue resistance, corrosion resistance and cold and hot cycle stability of the traditional repair material are solved.

Description

Technical Field

[0001] This invention relates to the field of wind turbine repair technology, specifically to a repair material for metal wear of wind turbine generator sets, its preparation method, and its application. Background Technology

[0002] Wind turbine generators operate in harsh outdoor environments for extended periods, enduring strong winds, sandstorms, temperature fluctuations, alternating loads, and corrosive media. This makes critical internal metal components highly susceptible to wear, fatigue cracks, and corrosion. Damage can range from reduced efficiency and increased energy consumption to equipment failure, downtime losses, and even safety accidents. Efficiently repairing damaged metal components extends equipment lifespan, reduces replacement costs, and ensures stable turbine operation, thus possessing significant economic and engineering value.

[0003] Currently, most metal wear repair materials on the market improve wear resistance by adding hard particles and reinforcing fillers. However, while improving wear resistance, this easily damages the internal structural stability of the material, leading to a significant decrease in impact toughness, mechanical strength, and fatigue resistance. Furthermore, conventional repair materials have poor corrosion resistance, unable to withstand humid, salt spray, and acid / alkali corrosive environments in the field, and exhibit poor thermal cycling stability. After repeated temperature changes, they are prone to cracking, peeling, and delamination, failing to meet the requirements of long-term, stable, and high-intensity operation of wind turbine generators.

[0004] To address the shortcomings of existing technologies, developing a metal wear repair material for wind turbine generators that combines high wear resistance, excellent impact toughness, mechanical strength, and fatigue resistance with excellent corrosion resistance and thermal cycling stability has become an urgent technical challenge in this field. Summary of the Invention

[0005] In view of the deficiencies of the prior art, the purpose of this invention is to provide a metal wear repair material for wind turbine generator sets, its preparation method and application, so as to solve the problems mentioned in the background art.

[0006] The present invention solves the technical problem by adopting the following technical solution: This invention provides a metal wear repair material for wind turbine generator sets. The raw materials, by weight, include: 7-11 parts of graphene-based reinforcing agent, 4-7 parts of modified lanthanum agent, 15-25 parts of binder, 3-6 parts of curing agent, 2-5 parts of diluent, 1-3 parts of anti-thermal cycling agent, and 0.5-1.2 parts of corrosion resistant agent.

[0007] Preferably, the raw materials, by weight, include: 9 parts of graphene-based reinforcing agent, 5.5 parts of modified lanthanum agent, 20 parts of binder, 4.5 parts of curing agent, 3.5 parts of diluent, 2 parts of anti-thermal cycling agent, and 0.8 parts of corrosion resistant agent.

[0008] The adhesive is epoxy resin E-51, the curing agent is polyamide 650, the diluent is acetone, the anti-thermal cycling agent is methyl methacrylate, and the corrosion resistant agent is benzotriazole.

[0009] Preferably, the graphene-based reinforcing agent is prepared through the following steps: Graphene was placed in a potassium permanganate solution with a mass fraction of 5-8% (5-8 times the total weight of graphene) and stirred until homogeneous. The solution was then washed with water, filtered, and dried to obtain dried graphene. 3-5 parts by weight of carbon fiber, 2-5 parts by weight of chromium carbide, 5-8 parts by weight of 2-5% yttrium nitrate solution and 3-5 parts by weight of 8-10% sodium citrate solution are thoroughly mixed to obtain a reinforcing solution; dry graphene and reinforcing solution are stirred evenly at a weight ratio of (4-6):9 to obtain a reinforced graphene solution; The reinforced graphene liquid and the synergist were ball-milled at a weight ratio of (11-15):5, with a ball milling speed of 1500-1700 r / min for 1-2 h. The mixture was then filtered and dried to obtain the graphene-based reinforcing agent.

[0010] Preferably, the synergist is prepared by the following steps: Mix 3-5 parts by weight of sodium carboxymethyl cellulose, 2-3 parts by weight of cerium oxide and 5-8 parts by weight of chitosan solution with a mass fraction of 2-5% evenly, add 1-3 parts by weight of silane coupling agent KH560, stir evenly to obtain the conditioning solution; 3-5 parts by weight of silicon carbide whiskers, 2-5 parts by weight of nano-alumina and 1-2 parts by weight of zirconium oxide are sintered at 450-500℃ for 1-2 hours to obtain a sintered body; the sintered body and the synergist are stirred thoroughly at a weight ratio of 3:(5-8), washed with water, filtered and dried to obtain the synergist.

[0011] Preferably, the graphene is multilayer graphene with 3-8 layers and a particle size of 1-5 μm; the carbon fiber has a diameter of 5-10 μm and a length of 50-100 μm; and the chromium carbide has a particle size of 20-50 nm.

[0012] Preferably, the silicon carbide whiskers have a diameter of 1-3 μm and an aspect ratio of 30-60; the nano-alumina particles have a diameter of 30-80 nm, and the zirconium oxide particles have a diameter of 20-60 nm.

[0013] Preferably, the modified lanthanum agent is prepared by the following steps: 3-5 parts by weight of nano-hexagonal boron nitride, 2-4 parts by weight of carbon nanotubes, 4-7 parts by weight of sodium dodecylbenzenesulfonate solution with a mass fraction of 5-8% and 1-2 parts by weight of silane coupling agent KH550 are mixed evenly to obtain the first modified solution; Nano-titanium nitride, niobium carbide and sodium silicate solution with a mass fraction of 4-6% were mixed evenly in a weight ratio of (4-7):(3-5):5 to obtain the modified second solution; The modified first liquid and the modified second liquid were mixed and ball-milled at a weight ratio of (5-9):3, with a ball milling speed of 1000-1500 r / min for 1-2 h to obtain the modified liquid. Lanthanum oxide is preheated at 55-60℃ for 1-2 hours, then added to a modification solution at 3-5 times its total weight. The mixture is stirred at 350-450 r / min for 2-3 hours, filtered, and dried to obtain the modified lanthanum agent.

[0014] Preferably, the nano-hexagonal boron nitride has a particle size of 100-300 nm; the carbon nanotubes are multi-walled carbon nanotubes with a diameter of 10-20 nm and a length of 10-30 μm; the nano-titanium nitride has a particle size of 20-40 nm; the niobium carbide has a particle size of 30-60 nm; and the lanthanum oxide has a particle size of 50-100 nm.

[0015] Graphene is activated by potassium permanganate oxidation, which increases the number of surface active sites and forms a three-dimensional wear-resistant network with carbon fiber and chromium carbide. The silicon carbide whiskers, nano alumina and zirconium oxide sintered body in the synergist serve as a hard wear-resistant skeleton and are uniformly dispersed in the interior of the repair layer, which significantly reduces the amount of friction and wear. Graphene sheets, carbon nanotubes, and carbon fibers work together to bear the load and disperse stress concentration; in the modified lanthanum agent, lanthanum oxide is combined with nano-hexagonal boron nitride, titanium nitride, and niobium carbide to refine the matrix structure and improve the interfacial bonding strength. Graphene and carbon nanotubes form a cross-linked network structure, which inhibits crack initiation and propagation; modified lanthanum agent optimizes the internal stress distribution of the material and improves its resistance to cyclic loading. Lanthanum oxide, cerium oxide, and hexagonal boron nitride form a dense protective layer, blocking water vapor, salt spray, and wind and sand erosion; silane coupling agents KH560 / KH550 improve the compatibility between the inorganic functional phase and the organic matrix, reducing interface defects; sodium carboxymethyl cellulose, chitosan, and anti-thermal cycling agents synergistically improve the material's thermal expansion adaptability and reduce thermal shock stress; the high thermal conductivity of graphene and silicon carbide whiskers rapidly dissipates heat, preventing local heat accumulation.

[0016] This invention also provides a method for preparing a metal wear repair material for wind turbine generator sets, comprising the following steps: S100: Raw material pretreatment: The graphene-based reinforcing agent and the modified lanthanum agent are ball-milled through an 800-mesh sieve to obtain ultrafine functional powder; S200: Base material preparation: Add binder, diluent, anti-cold and hot cycle agent and corrosion resistant agent to the reactor, stir at 400-600 r / min for 20-30 min, mix evenly to obtain base material liquid; S300: Functional compounding: Add ultrafine functional powder to base liquid, stir at high speed of 800-1200r / min for 1h, ultrasonically disperse for 20-30min, ultrasonic power 300-400W, to obtain mixed repair slurry; S400: Curing and molding: Add curing agent to the mixed repair slurry, stir evenly, vacuum degas for 10-15 minutes, vacuum degree -0.08~-0.1MPa, to obtain the metal wear repair material for wind turbine generator sets.

[0017] The present invention also provides an application of a metal wear repair material for wind turbine generator sets, which is used for the repair of wear, scratches, and corrosion of metal components such as the main shaft, gearbox, bearings, and hub of wind turbine generator sets.

[0018] Compared with the prior art, the present invention has the following beneficial effects: This invention relates to a metal wear repair material for wind turbine generator sets. It uses graphene-based reinforcing agents and modified lanthanum agents in a blend, and coordinates the raw materials such as binders and curing agents. Through the improvement of the co-mixing of raw materials, the materials enhance each other and achieve synergistic effects. The resulting repair material can solve the problems of decreased impact toughness, strength, and fatigue resistance, as well as poor corrosion resistance and thermal cycling stability after the wear resistance of traditional repair materials is improved. It is suitable for the wear repair needs of metal components of wind turbine generator sets under high load, variable temperature, and corrosive environments. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to specific examples. 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.

[0020] This embodiment provides a metal wear repair material for wind turbine generator sets. The raw materials, by weight, include: 7-11 parts of graphene-based reinforcing agent, 4-7 parts of modified lanthanum agent, 15-25 parts of binder, 3-6 parts of curing agent, 2-5 parts of diluent, 1-3 parts of anti-thermal cycling agent, and 0.5-1.2 parts of corrosion resistant agent.

[0021] The raw materials in this embodiment, by weight, include: 9 parts of graphene-based reinforcing agent, 5.5 parts of modified lanthanum agent, 20 parts of binder, 4.5 parts of curing agent, 3.5 parts of diluent, 2 parts of anti-thermal cycling agent, and 0.8 parts of corrosion resistant agent.

[0022] The adhesive is epoxy resin E-51, the curing agent is polyamide 650, the diluent is acetone, the anti-thermal cycling agent is methyl methacrylate, and the corrosion resistant agent is benzotriazole.

[0023] The graphene-based reinforcing agent in this embodiment is prepared through the following steps: Graphene was placed in a potassium permanganate solution with a mass fraction of 5-8% (5-8 times the total weight of graphene) and stirred until homogeneous. The solution was then washed with water, filtered, and dried to obtain dried graphene. 3-5 parts by weight of carbon fiber, 2-5 parts by weight of chromium carbide, 5-8 parts by weight of 2-5% yttrium nitrate solution and 3-5 parts by weight of 8-10% sodium citrate solution are thoroughly mixed to obtain a reinforcing solution; dry graphene and reinforcing solution are stirred evenly at a weight ratio of (4-6):9 to obtain a reinforced graphene solution; The reinforced graphene liquid and the synergist were ball-milled at a weight ratio of (11-15):5, with a ball milling speed of 1500-1700 r / min for 1-2 h. The mixture was then filtered and dried to obtain the graphene-based reinforcing agent.

[0024] The synergist in this embodiment is prepared through the following steps: Mix 3-5 parts by weight of sodium carboxymethyl cellulose, 2-3 parts by weight of cerium oxide and 5-8 parts by weight of chitosan solution with a mass fraction of 2-5% evenly, add 1-3 parts by weight of silane coupling agent KH560, stir evenly to obtain the conditioning solution; 3-5 parts by weight of silicon carbide whiskers, 2-5 parts by weight of nano-alumina and 1-2 parts by weight of zirconium oxide are sintered at 450-500℃ for 1-2 hours to obtain a sintered body; the sintered body and the synergist are stirred thoroughly at a weight ratio of 3:(5-8), washed with water, filtered and dried to obtain the synergist.

[0025] The graphene in this embodiment is multilayer graphene with 3-8 layers and a particle size of 1-5 μm; the carbon fiber has a diameter of 5-10 μm and a length of 50-100 μm; the chromium carbide has a particle size of 20-50 nm.

[0026] In this embodiment, the silicon carbide whiskers have a diameter of 1-3 μm and an aspect ratio of 30-60; the nano-alumina particles have a diameter of 30-80 nm, and the zirconium oxide particles have a diameter of 20-60 nm.

[0027] The modified lanthanum agent in this embodiment is prepared through the following steps: 3-5 parts by weight of nano-hexagonal boron nitride, 2-4 parts by weight of carbon nanotubes, 4-7 parts by weight of sodium dodecylbenzenesulfonate solution with a mass fraction of 5-8% and 1-2 parts by weight of silane coupling agent KH550 are mixed evenly to obtain the first modified solution; Nano-titanium nitride, niobium carbide and sodium silicate solution with a mass fraction of 4-6% were mixed evenly in a weight ratio of (4-7):(3-5):5 to obtain the modified second solution; The modified first liquid and the modified second liquid were mixed and ball-milled at a weight ratio of (5-9):3, with a ball milling speed of 1000-1500 r / min for 1-2 h to obtain the modified liquid. Lanthanum oxide is preheated at 55-60℃ for 1-2 hours, then added to a modification solution at 3-5 times its total weight. The mixture is stirred at 350-450 r / min for 2-3 hours, filtered, and dried to obtain the modified lanthanum agent.

[0028] In this embodiment, the nano-hexagonal boron nitride particles have a diameter of 100-300 nm; the carbon nanotubes are multi-walled carbon nanotubes with a diameter of 10-20 nm and a length of 10-30 μm; the nano-titanium nitride particles have a diameter of 20-40 nm; the niobium carbide particles have a diameter of 30-60 nm; and the lanthanum oxide particles have a diameter of 50-100 nm.

[0029] This embodiment describes a method for preparing a metal wear repair material for wind turbine generator sets, comprising the following steps: S100: Raw material pretreatment: The graphene-based reinforcing agent and the modified lanthanum agent are ball-milled through an 800-mesh sieve to obtain ultrafine functional powder; S200: Base material preparation: Add binder, diluent, anti-cold and hot cycle agent and corrosion resistant agent to the reactor, stir at 400-600 r / min for 20-30 min, mix evenly to obtain base material liquid; S300: Functional compounding: Add ultrafine functional powder to base liquid, stir at high speed of 800-1200r / min for 1h, ultrasonically disperse for 20-30min, ultrasonic power 300-400W, to obtain mixed repair slurry; S400: Curing and molding: Add curing agent to the mixed repair slurry, stir evenly, vacuum degas for 10-15 minutes, vacuum degree -0.08~-0.1MPa, to obtain the metal wear repair material for wind turbine generator sets.

[0030] This embodiment describes the application of a metal wear repair material for wind turbine generator sets. The repair material is used to repair wear, scratches, and corrosion on metal components such as the main shaft, gearbox, bearings, and hub of wind turbine generator sets. Example 1

[0031] A metal wear repair material for wind turbine generator sets, comprising the following raw materials by weight: 9 parts graphene-based reinforcing agent, 5.5 parts modified lanthanum agent, 20 parts epoxy resin E-51, 4.5 parts polyamide 650 curing agent, 3.5 parts acetone diluent, 2 parts methyl methacrylate anti-thermal cycling agent, and 0.8 parts benzotriazole corrosion resistant agent.

[0032] Preparation of graphene-based reinforcing agents: S01: Graphene was added to 6 times its mass fraction of 6% potassium permanganate solution and stirred, then washed with water, filtered, and dried to obtain dried graphene; S02: 4 parts carbon fiber, 3.5 parts chromium carbide, 6.5 parts 3% yttrium nitrate solution, and 4 parts 9% sodium citrate solution were blended to obtain a reinforcing solution; dried graphene and the reinforcing solution were stirred at a ratio of 5:9 to obtain a reinforced graphene solution; S03a: 4 parts sodium carboxymethyl cellulose, 2.5 parts cerium oxide, 6.5 parts 3% chitosan solution, and 2 parts KH560 were added to obtain a modulating solution; S03b: 4 parts silicon carbide whiskers, 3.5 parts nano-alumina, and 1.5 parts zirconium oxide were sintered at 470℃ for 1.5 h to obtain a sintered body; the sintered body and the modulating solution were mixed at a ratio of 3:6.5. The synergist was obtained by stirring; SO3: the reinforced graphene liquid and the synergist were ball-milled at 13:5 at 1600 r / min for 1.5 h and dried to obtain the graphene reinforcing agent.

[0033] Preparation of modified lanthanum agent: S11: 4 parts of nano-hexagonal boron nitride, 3 parts of carbon nanotubes, 5.5 parts of 6% sodium dodecylbenzenesulfonate solution, and 1.5 parts of KH550 were blended to obtain the first modified liquid; S12: 5.5 parts of nano-titanium nitride, 4 parts of niobium carbide, and 5 parts of 5% sodium silicate solution were blended to obtain the second modified liquid; S13: the first modified liquid and the second modified liquid were ball-milled at 1200 r / min for 2 h in a 7:3 ratio to obtain the modified liquid; S14: lanthanum oxide was preheated at 57℃ for 1.5 h, 4 times the amount of modified liquid was added, stirred at 400 r / min for 2.5 h, and dried to obtain the modified lanthanum agent.

[0034] Preparation process: S100: Functional powder passes through an 800-mesh sieve; S200: Base material components are stirred at 500 r / min for 30 min; S300: Functional powder is added to the base material, stirred at 1000 r / min for 1 h, and ultrasonicated at 350 W for 30 min; S400: Curing agent is added, and vacuum degassing is performed for 15 min to obtain the repair material.

[0035] In this embodiment, the graphene is multilayered graphene with 5 layers and a particle size of 3 μm; the carbon fiber has a diameter of 7.5 μm and a length of 75 μm; the chromium carbide has a particle size of 35 nm; the silicon carbide whiskers have a diameter of 2 μm and an aspect ratio of 45; the nano-alumina has a particle size of 55 nm, the zirconium oxide has a particle size of 40 nm; the nano-hexagonal boron nitride has a particle size of 200 nm; the carbon nanotubes are multi-walled carbon nanotubes with a diameter of 15 nm and a length of 20 μm; the nano-titanium nitride has a particle size of 30 nm, the niobium carbide has a particle size of 45 nm; and the lanthanum oxide has a particle size of 75 nm. Example 2

[0036] A metal wear repair material for wind turbine generator sets, comprising the following raw materials by weight: 7 parts graphene-based reinforcing agent, 4 parts modified lanthanum agent, 15 parts epoxy resin E-51, 3 parts polyamide 650 curing agent, 2 parts acetone diluent, 1 part methyl methacrylate anti-thermal cycling agent, and 0.5 parts benzotriazole corrosion resistant agent.

[0037] The preparation and process parameters of the graphene-based reinforcing agent and modified lanthanum agent all use the lower limit values, and the rest are the same as in Example 1. Example 3

[0038] A metal wear repair material for wind turbine generator sets, comprising the following raw materials by weight: 11 parts graphene-based reinforcing agent, 7 parts modified lanthanum agent, 25 parts epoxy resin E-51, 6 parts polyamide 650 curing agent, 5 parts acetone diluent, 3 parts methyl methacrylate anti-thermal cycling agent, and 1.2 parts benzotriazole corrosion resistant agent.

[0039] The preparation and process parameters of the graphene-based reinforcing agent and modified lanthanum agent all use the upper limit values, and the rest are the same as in Example 1.

[0040] Scale settings The process is the same as in Example 1, except for the changes in components and preparation parameters: Comparative Example 1: No graphene-based reinforcing agent was added to the repair material; Comparative Example 2: No reinforcing solution was added during the preparation of the graphene-based reinforcing agent; Comparative Example 3: No carbon fiber or chromium carbide was added to the strengthening solution; Comparative Example 4: No synergist was added during the preparation of the graphene-based reinforcing agent; Comparative Example 5: No sintered body was added during the preparation of the synergist; Comparative Example 6: Cerium oxide was not added in the preparation of the conditioning solution, and water was used instead of chitosan solution; Comparative Example 7: No modified lanthanum agent was added to the repair material; Comparative Example 8: No modifying solution was added during the preparation of the modified lanthanum agent; Comparative Example 9: No second modified liquid was added during the preparation of the modified liquid; Comparative Example 10: No first modified solution was added during the preparation of the modified solution; Comparative Example 11: No nano-hexagonal boron nitride or carbon nanotubes were added during the preparation of the modified first liquid.

[0041] Performance testing Tensile strength was tested according to GB / T 228.1-2010; impact toughness was tested according to GB / T 229-2020; wear was tested according to GB / T 3960-2017; fatigue resistance was tested according to GB / T 3075-2008; salt spray corrosion resistance was tested according to GB / T 1771-2007; thermal cycling test: 100 cycles at -40℃ to 120℃, and the condition of the repair layer was observed.

[0042] Table 1 shows the mechanical and abrasion resistance test results. Table 2. Corrosion resistance and thermal cycling performance test results; Comparative Example 1: Without graphene reinforcement, the tensile strength is only 45.2 MPa and the impact toughness is 4.5 J / cm. 2 The wear amount was 0.058mg and the fatigue resistance was only 300,000 cycles, with a performance decrease of more than 50% compared to Example 1, proving that graphene reinforcing agent is the core component for improving the strength, toughness, wear resistance and fatigue resistance of materials; Comparative Example 2: The unreinforced solvent was not used, and the graphene was not combined with carbon fiber and chromium carbide. The wear-resistant skeleton was missing, and the performance was greatly reduced. Comparative Example 3: Without the addition of carbon fiber and chromium carbide, the three-dimensional wear-resistant network could not be formed, the wear rate increased, and the strength and toughness decreased simultaneously.

[0043] Comparative Example 4: Without the addition of synergists, the graphene exhibited poor dispersibility, was prone to agglomeration, and had weak interfacial bonding, resulting in a significant reduction in impact toughness and fatigue resistance. Comparative Example 5: Without the addition of silicon carbide whiskers, alumina, and zirconia sintered body, the hard and wear-resistant phase was missing, leading to increased wear and decreased strength. Comparative Example 6: Without the addition of cerium oxide and replacing the chitosan solution, the dispersion and coupling effects were lost, the inorganic phase debonded from the matrix, and all properties were significantly degraded.

[0044] Comparative Example 7: Without the addition of modified lanthanum agent, the internal stress of the material could not be optimized, resulting in a significant decrease in toughness, fatigue resistance, and salt spray resistance. Comparative Example 8: Without treatment of lanthanum oxide with the modifying liquid, the lanthanum oxide agglomerated severely, failing to exert its toughening and weather-resistant effects, and the repair layer was prone to corrosion and cracking. Comparative Examples 9 / 10: Lacking the second and first modifying liquids respectively, the synergistic effect of the two liquids failed, the lanthanum oxide modification was insufficient, and the fatigue resistance and corrosion resistance were reduced. Comparative Example 11: Without the addition of hexagonal boron nitride and carbon nanotubes, the toughening and corrosion-resistant components were missing, further degrading the performance.

[0045] Example 1 showed a salt spray resistance of 1200h, Example 2 1000h, and Example 3 1350h, significantly higher than all comparative examples. Comparative Example 1, without graphene reinforcing agent, had a less dense protective layer and only 300h of salt spray resistance; Comparative Example 7, without modified lanthanum agent, lacked lanthanum oxide protection and only 380h of salt spray resistance; Comparative Example 8, without modified lanthanum oxide, only 330h of salt spray resistance; Comparative Examples 2-6 and 9-11 had salt spray resistance times between 400-520h, all showing a significant decrease in protective ability due to the lack of certain functional components. This fully demonstrates that graphene reinforcing agent is responsible for constructing a dense, wear-resistant protective layer, while modified lanthanum agent is responsible for improving interfacial corrosion resistance; both are indispensable.

[0046] Comparative Examples 1 / 7 / 8 exhibit severe cracking, delamination, and pulverization, indicating a lack of graphene reinforcing agents or modified lanthanum agents. This leads to mismatched thermal expansion, concentrated thermal stress, and rapid failure. Furthermore, the absence of reinforcing liquid, synergist, and sintered body results in weak interfacial bonding, making the material prone to peeling after thermal cycling.

[0047] Graphene reinforcing agents are responsible for wear resistance, reinforcement, and fatigue resistance, while modified lanthanum agents are responsible for toughening, corrosion resistance, and thermal stability. The two achieve a synergistic effect of 1+1>2 through coupling agents, dispersants, and organic coatings. The absence of any component or process step will lead to decreased dispersibility, interfacial debonding, wear-resistant skeleton fracture, and protective layer failure, ultimately making the repair material unable to simultaneously meet the comprehensive requirements of high wear resistance, high toughness, high strength, high fatigue resistance, strong corrosion resistance, and excellent thermal cycling stability.

[0048] In summary, the wind turbine metal wear repair material prepared by this invention, through the synergistic effect of graphene-based reinforcing agents and modified lanthanum agents, possesses high wear resistance, high tensile strength, high impact toughness, excellent fatigue resistance, strong corrosion resistance, and excellent thermal cycling stability. Its performance is comprehensively superior to traditional products, making it suitable for the efficient repair of metal components such as wind turbine main shafts, gearboxes, and bearings.

[0049] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0050] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A metal wear repair material for wind turbine generator sets, characterized in that, The raw materials, by weight, include: 7-11 parts of graphene-based reinforcing agent, 4-7 parts of modified lanthanum agent, 15-25 parts of binder, 3-6 parts of curing agent, 2-5 parts of diluent, 1-3 parts of anti-thermal cycling agent, and 0.5-1.2 parts of corrosion resistant agent.

2. The metal wear repair material for wind turbine generator sets according to claim 1, characterized in that, The raw materials, by weight, include: 9 parts graphene-based reinforcing agent, 5.5 parts modified lanthanum agent, 20 parts binder, 4.5 parts curing agent, 3.5 parts diluent, 2 parts anti-thermal cycling agent, and 0.8 parts corrosion resistant agent.

3. The metal wear repair material for wind turbine generator sets according to claim 1, characterized in that, The graphene-based reinforcing agent is prepared through the following steps: Graphene was placed in a potassium permanganate solution with a mass fraction of 5-8% (5-8 times the total weight of graphene) and stirred until homogeneous. The solution was then washed with water, filtered, and dried to obtain dried graphene. 3-5 parts by weight of carbon fiber, 2-5 parts by weight of chromium carbide, 5-8 parts by weight of 2-5% yttrium nitrate solution and 3-5 parts by weight of 8-10% sodium citrate solution are thoroughly mixed to obtain a reinforcing solution; dry graphene and reinforcing solution are stirred evenly at a weight ratio of (4-6):9 to obtain a reinforced graphene solution; The reinforced graphene liquid and the synergist were ball-milled at a weight ratio of (11-15):5, with a ball milling speed of 1500-1700 r / min for 1-2 h. The mixture was then filtered and dried to obtain the graphene-based reinforcing agent.

4. The metal wear repair material for wind turbine generator sets according to claim 3, characterized in that, The synergist is prepared through the following steps: Mix 3-5 parts by weight of sodium carboxymethyl cellulose, 2-3 parts by weight of cerium oxide and 5-8 parts by weight of chitosan solution with a mass fraction of 2-5% evenly, add 1-3 parts by weight of silane coupling agent KH560, stir evenly to obtain the conditioning solution; 3-5 parts by weight of silicon carbide whiskers, 2-5 parts by weight of nano-alumina and 1-2 parts by weight of zirconium oxide are sintered at 450-500℃ for 1-2 hours to obtain a sintered body; the sintered body and the synergist are stirred thoroughly at a weight ratio of 3:(5-8), washed with water, filtered and dried to obtain the synergist.

5. The metal wear repair material for wind turbine generator sets according to claim 4, characterized in that, The graphene is multilayer graphene with 3-8 layers and a particle size of 1-5 μm; the carbon fiber has a diameter of 5-10 μm and a length of 50-100 μm; the chromium carbide has a particle size of 20-50 nm.

6. The metal wear repair material for wind turbine generator sets according to claim 4, characterized in that, The silicon carbide whiskers have a diameter of 1-3 μm and an aspect ratio of 30-60; the nano-alumina particles have a diameter of 30-80 nm, and the zirconium oxide particles have a diameter of 20-60 nm.

7. The metal wear repair material for wind turbine generator sets according to claim 1, characterized in that, The modified lanthanum agent is prepared through the following steps: 3-5 parts by weight of nano-hexagonal boron nitride, 2-4 parts by weight of carbon nanotubes, 4-7 parts by weight of sodium dodecylbenzenesulfonate solution with a mass fraction of 5-8% and 1-2 parts by weight of silane coupling agent KH550 are mixed evenly to obtain the first modified solution; Nano-titanium nitride, niobium carbide and sodium silicate solution with a mass fraction of 4-6% were mixed evenly in a weight ratio of (4-7):(3-5):5 to obtain the modified second solution; The modified first liquid and the modified second liquid were mixed and ball-milled at a weight ratio of (5-9):3, with a ball milling speed of 1000-1500 r / min for 1-2 h to obtain the modified liquid. Lanthanum oxide is preheated at 55-60℃ for 1-2 hours, then added to a modification solution at 3-5 times its total weight. The mixture is stirred at 350-450 r / min for 2-3 hours, filtered, and dried to obtain the modified lanthanum agent.

8. The metal wear repair material for wind turbine generator sets according to claim 7, characterized in that, The nano-hexagonal boron nitride has a particle size of 100-300 nm; the carbon nanotubes are multi-walled carbon nanotubes with a diameter of 10-20 nm and a length of 10-30 μm; the nano-titanium nitride has a particle size of 20-40 nm; the niobium carbide has a particle size of 30-60 nm; and the lanthanum oxide has a particle size of 50-100 nm.

9. A method for preparing a metal wear repair material for wind turbine generator sets as described in any one of claims 1-8, characterized in that, Includes the following steps: S100: Raw material pretreatment: The graphene-based reinforcing agent and the modified lanthanum agent are ball-milled through an 800-mesh sieve to obtain ultrafine functional powder; S200: Base material preparation: Add binder, diluent, anti-cold and hot cycle agent and corrosion resistant agent to the reactor, stir at 400-600 r / min for 20-30 min, mix evenly to obtain base material liquid; S300: Functional compounding: Add ultrafine functional powder to base liquid, stir at high speed of 800-1200r / min for 1h, ultrasonically disperse for 20-30min, ultrasonic power 300-400W, to obtain mixed repair slurry; S400: Curing and molding: Add curing agent to the mixed repair slurry, stir evenly, vacuum degas for 10-15 minutes, vacuum degree -0.08~-0.1MPa, to obtain the metal wear repair material for wind turbine generator sets.

10. The application of a metal wear repair material for wind turbine generator sets as described in any one of claims 1-8, characterized in that, The repair material is used to repair wear, scratches, and corrosion on metal components of wind turbine generator sets.

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