A method and tool for preventing leakage of a turbine blade tenon
By using a double-layer protective layer of ethanol shellac and alumina mixture slurry on the turbine blade tenon and coordinating it with anti-seepage tooling, the problems of low efficiency and high cost in anti-seepage treatment of turbine blade tenons were solved, achieving a high-efficiency and low-cost anti-seepage effect, and protecting the assembly quality and service life of the tenon.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SICHUAN OUHANG TECH CO LTD
- Filing Date
- 2026-05-22
- Publication Date
- 2026-07-07
Smart Images
Figure CN122344701A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of aluminizing processing technology for turbine blade surfaces of aero-engines, and particularly to a method and tooling for preventing seepage in turbine blade tenons. Background Technology
[0002] Turbine blades are core components of aero-engines and gas turbines. Their tenon joints need to operate under high temperature and pressure conditions for extended periods, and they must also fit tightly with the turbine disk to ensure stability during high-speed rotation. During blade manufacturing, a thermal barrier coating (i.e., high-temperature vapor-phase aluminizing) is typically applied to the blade surface to improve its high-temperature resistance. However, the coating material can easily seep into the tenon area during application, leading to dimensional deviations or assembly interference, severely impacting the blade's assembly quality and service life. Therefore, anti-seepage treatment is usually required for the tenons.
[0003] Currently, the industry mainly uses mechanical shielding or chemical masking to prevent seepage in tenons, but existing methods have problems such as low efficiency, high cost, or unstable seepage prevention effect. Summary of the Invention
[0004] This application discloses a seepage prevention method and tooling for turbine blade tenons, in order to solve the problems of low efficiency, high cost or unstable seepage prevention effect in the prior art.
[0005] To solve the above problems, the present invention adopts the following technical solution: A method for preventing seepage in turbine blade tenons includes the following steps: S1. Clean the turbine blades, then blow dry the surface of the turbine blades, and put the turbine blades into an oven to dry. S2. Sandblast the aluminized parts of the turbine blades; S3. Apply a base layer of protective slurry made of ethanol shellac and alumina to the surface of the tenon. Then apply a top layer of protective slurry made of ethanol shellac and nickel carbonyl powder to the surface of the base layer of protective slurry. Place the tenon coated with the top layer of protective slurry in the anti-seepage fixture and fill the gap between the anti-seepage fixture and the tenon with alumina powder. S4. Place the turbine blades that have been properly protected against seepage in S3 into the aluminizing equipment for chemical vapor aluminizing. S5. Clean the surface of the turbine blades after aluminizing in S4. S6, Inspection.
[0006] Further, in step S3, the ethanol shellac is prepared by mixing 5-10g of shellac with 100-150ml of ethanol through stirring.
[0007] Furthermore, in step S3, the ratio of ethanol shellac to alumina in the bottom slurry protective layer is 3:1.
[0008] Furthermore, in step S3, the ratio of ethanol shellac to carbonyl nickel powder in the surface slurry protective layer is 1.5 to 2:1.
[0009] Furthermore, in step S3, the thickness of the bottom slurry protective layer is 3-4 mm, and the thickness of the top slurry protective layer is 1-2 mm.
[0010] Furthermore, in step S3, both the bottom protective layer and the top protective layer of the slurry need to be cured by natural air drying or oven drying after the coating is completed.
[0011] Furthermore, in step S3, before the tenon is placed in the seepage-proof fixture, the seepage-proof fixture is pre-filled with one-third alumina powder.
[0012] A seepage-proof fixture for turbine blade tenons, applied to the aforementioned seepage-proof method for turbine blade tenons, the seepage-proof fixture includes two cooperating alloy sleeves, a contour-fitting limiting plate that mates with the tenon groove of the tenon is provided inside the alloy sleeve, ear plates are provided on both sides of the alloy sleeve, and the two alloy sleeves are connected by a connector.
[0013] Furthermore, the alloy jacket has openings, and there is a gap between the alloy jacket and the turbine blade at the openings, through which alumina powder is filled.
[0014] Furthermore, the alloy jacket is made of MAR-M247 alloy, In718 alloy, or other nickel-based high-temperature alloy materials.
[0015] The technical solution adopted in this invention can achieve the following beneficial effects: 1. This invention uses a bottom slurry protective layer to seal the micropores of the tenon substrate, preventing the aluminizing gaseous medium from penetrating inward. After the top slurry protective layer forms a film, it further seals the tiny air-permeable channels of the bottom slurry protective layer, forming a double-layer sealed film shell with the bottom slurry protective layer. This significantly improves the overall resistance to aluminizing atmosphere penetration. At the same time, the tenon area is covered by an anti-seepage tooling, and the gaps are filled with alumina powder. The powder accumulation forms a solid, sealed, heat-insulating, and seepage-blocking layer, isolating the flowing aluminizing gaseous medium and further improving the aluminizing protection effect, ensuring that the coating material will not penetrate into the tenon area. This invention achieves complete sealing of non-seepage areas through the combination of a double-layer composite slurry protective layer, anti-seepage tooling, and powder filling. It has high anti-seepage precision and good anti-seepage effect, and does not damage the mechanical properties and assembly precision of the tenon throughout the process, providing strong substrate protection. 2. The slurry protective layer of the present invention can dry quickly after application, which greatly saves the drying and curing time and avoids the problem of leakage risk caused by poor adhesion between the anti-seepage material and the tenon in the traditional anti-seepage process. Moreover, the shellac will carbonize and decompose at high temperature, and most of it will evaporate and disappear, leaving almost no residue and pollution. The slurry protective layer is easy to peel off without residue, and the slurry cost is low, making it suitable for enterprises to use in mass production. 3. The seepage prevention tooling of the present invention has a simple structure, is easy to assemble and disassemble, and has low labor intensity. Compared with the special clamps required in traditional seepage prevention processes, it greatly reduces production costs. 4. The seepage prevention method of the present invention can provide effective protection for the non-seepage parts of turbine blades at a temperature of 800-1065℃. After protection, there is no leakage in the non-seepage parts. The seepage prevention method of the present invention solves the problems of low efficiency and long cycle of traditional seepage prevention processes, greatly shortens the production cycle of seepage prevention, and improves the enterprise's profits. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0017] Figure 1 This is a schematic diagram of the structure of the seepage prevention tooling and turbine blades in cooperation with some embodiments of this application; Figure 2 This is one of the cross-sectional structural schematic diagrams of the anti-seepage tooling and turbine blades disclosed in some embodiments of this application; Figure 3 This is the second cross-sectional structural schematic diagram of the anti-seepage tooling and turbine blade cooperation disclosed in some embodiments of this application; Figure 4 This is a cross-sectional metallographic image of the non-permeable part of the tenon obtained after processing using the anti-permeability method disclosed in some embodiments of this application; Figure 5 The image shows a cross-sectional metallographic image of the aluminized portion of the blade obtained after processing using the anti-seepage method disclosed in some embodiments of this application.
[0018] In the picture: 100 - Waterproofing fixture; 110 - Alloy jacket; 120 - Square limiting plate; 130 - Ear plate; 140 - Opening; 10-Turbine blade; 11-Blade body; 12-Side plate; 13-Tenon; a-Surface; b-Substrate; c-External aluminum infiltration layer; d-Diffusion layer. Detailed Implementation
[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.
[0020] The terms "first," "second," "third," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," "third," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.
[0021] The inventive concept of this application is described here: Currently, common seepage prevention methods and their shortcomings in existing technologies include: (1) Wrap the tenon with metal foil or tape. This method is simple to operate but is prone to gaps that cause leakage. Moreover, the metal foil or tape is difficult to clean after seepage prevention treatment, and may leave impurities, affecting product quality. (2) Simply using the anti-seepage slurry to form a protective layer by natural drying of the slurry and peeling it off after the coating has cured. This method has a good anti-seepage effect but the process is complicated, the cycle is long and the cost is high, which affects production efficiency. If the anti-seepage material is not tightly attached to the tenon, it is easy to cause leakage risk. (3) Design a special fixture to mechanically clamp the tenon. This method has high reliability but poor versatility and affects coating efficiency, and is costly.
[0022] Based on this, the inventor provides a seepage prevention method and tooling for turbine blade tenons to meet the requirements of high efficiency, low cost, and high reliability. It has high seepage prevention accuracy, strong substrate protection, easy removal of the slurry protective layer with no residue, no damage to the substrate, low cost, and strong practicality. The seepage prevention tooling has a simple structure, is easy to assemble and disassemble, and has low labor intensity. It solves the problems of low efficiency and long cycle of traditional seepage prevention processes and improves the profitability of enterprises.
[0023] The following is in conjunction with the appendix Figures 1 to 5 This application provides a detailed description of a seepage prevention method and seepage prevention tooling for turbine blade tenons through specific embodiments and application scenarios.
[0024] Reference Figures 1 to 3 A method for preventing seepage in turbine blade tenons includes the following steps: S1. Clean the turbine blades 10, then blow dry the surface of the turbine blades 10, and put the turbine blades 10 into an oven to dry. Specifically, the turbine blade 10 includes a blade body 11, a rim plate 12, and a tenon 13. The blade body 11 is an aluminized part; the rim plate 12 is a transition area, that is, a transition area between the aluminized part and the non-aluminized part. This position may or may not be present. In this embodiment, the rim plate 12 is also an aluminized part; the tenon 13 is a non-aluminized part; the blade body 11 is connected to the top of the rim plate 12, and the tenon 13 is connected to the bottom of the rim plate 12.
[0025] The turbine blades 10 are cleaned using an ultrasonic cleaner to remove oil and impurities from their surface, eliminating any impact on the adhesion of subsequent sandblasting and slurry coatings. Anhydrous ethanol is used as the cleaning medium in the ultrasonic cleaner. Then, clean, oil-free compressed air is used to dry the surface of the turbine blades 10. The turbine blades 10 are then placed in an oven for further drying to prevent residual moisture inside and on the surface of the blades. This prevents moisture from vaporizing and bubbling under high-temperature aluminizing conditions, which could damage the protective coating and improve the bonding stability of all subsequent surface treatment processes, thus providing a clean base for the anti-seepage coating. The oven drying temperature is 80–100℃, and the drying time is 15–20 minutes. The ultrasonic cleaner, air compressor, and oven are all existing equipment, and their specific structures and working principles are common knowledge; therefore, they will not be described in detail here.
[0026] S2. Sandblast the aluminized parts of the turbine blade 10. Specifically, the turbine blade 10 is pretreated with sandblasting to roughen the aluminizing area, increase the contact area between the aluminizing medium and the substrate, and improve the deposition rate, bonding strength and uniformity of the aluminizing layer. The non-aluminizing area can be protected with tape before sandblasting. After sandblasting, the tape on the non-aluminizing area is cleaned off to distinguish the treatment interface and clarify the boundary between the non-aluminizing area and the aluminizing area to prevent the aluminizing boundary from blurring and overflowing.
[0027] S3. Apply a base protective layer of slurry made of ethanol shellac and alumina to the surface of the tenon 13, and then apply a top protective layer of slurry made of ethanol shellac and nickel carbonyl powder to the surface of the base protective layer; place the tenon 13 coated with the top protective layer of slurry in the anti-seepage fixture 100, and fill the gap between the anti-seepage fixture 100 and the tenon 13 with alumina powder. Specifically, the tenon 13 substrate is coated with a bottom slurry protective layer to seal the micropores of the substrate and prevent the aluminizing gaseous medium from penetrating inward. After the top slurry protective layer forms a film, it further seals the tiny air-permeable channels of the bottom slurry protective layer, forming a double-layer sealed film shell with the bottom slurry protective layer. This significantly improves the overall resistance to aluminizing atmosphere penetration. At the same time, the anti-seepage fixture 100 covers the tenon 13 area to provide overall anti-seepage protection around the tenon 13, and fills the gaps with alumina powder. The powder accumulation forms a solid, sealed, heat-insulating, and anti-seepage layer, which isolates the flowing aluminizing gaseous medium, further improving the aluminizing protection effect. This ensures that the coating material will not penetrate into the tenon 13 area and also prevents the slurry protective layer from sticking to the anti-seepage fixture 100 due to incomplete curing, ensuring that the substrate will not be damaged.
[0028] Traditional protective slurries use zirconium oxide, which is expensive, has limited sourcing channels, and is generally suitable for solid aluminizing, with a protective temperature limit of 1000℃. It is not suitable for aluminizing temperatures of 1040-1065℃ in vapor-phase aluminizing, and is prone to cracking. This invention achieves complete sealing of non-seepage areas through the combination of a double-layer composite slurry protective layer, anti-seepage tooling 100, and powder filling. It has high anti-seepage precision and good anti-seepage effect, and does not damage the mechanical properties and assembly precision of the tenon 13 throughout the process, providing strong protection for the substrate.
[0029] Ethanol-based shellac is easy to apply at room temperature, dries quickly to form a film, and has strong adhesion. Ethanol evaporates completely at low temperatures, eliminating the need for prolonged settling after application. The slurry quickly loses its fluidity and sets, allowing the ethanol to dissipate prematurely. This prevents the rapid vaporization and bubbling of solvents that could crack the protective layer during the subsequent high-temperature aluminizing process, thus preventing air gaps in the protective layer. Furthermore, the evaporation of ethanol produces no harmful substances, ensuring a clean working environment. Shellac dries quickly after application, achieving initial curing in a short time, significantly reducing drying time. During the high-temperature aluminizing process, shellac gradually carbonizes and decomposes, eventually evaporating almost entirely, leaving virtually no solid residue on the tenon surface. The decomposition and volatilization products of shellac are free of toxic or harmful impurities, do not pollute the gaseous medium in the aluminizing furnace, do not cause elemental contamination of the substrate, and produce no industrial waste, making it environmentally friendly. Excellent properties; alumina powder is resistant to high temperatures and maintains a stable solid state throughout the entire aluminizing temperature range. It does not soften or sinter and is lost as the temperature rises, remaining within the protective area. It does not react chemically with the atmosphere in the aluminizing furnace, precisely blocking the aluminizing gaseous medium. After the shellac in the bottom slurry protective layer volatilizes, the alumina particles interlock and accumulate, maintaining the overall arrangement structure of the protective layer and continuously exerting its anti-seepage effect, ensuring that the anti-seepage effect does not diminish throughout the aluminizing process. Preferably, the alumina powder in the bottom slurry protective layer and the alumina powder filling the gaps are both above 1000 mesh. Carbonyl nickel powder has high density and excellent air tightness. After film formation, it can further seal the tiny air permeable channels of the bottom slurry protective layer. Preferably, the size of the carbonyl nickel powder is 2.5-6μm. Therefore, neither the bottom slurry protective layer nor the top slurry protective layer will alloy with the substrate and affect the performance of the parts.
[0030] The number of protective slurry layers depends on the aluminizing temperature (i.e. the heating temperature of vapor phase aluminizing). When the aluminizing temperature is between 750 and 900°C, only one layer of the bottom slurry protective layer and one layer of the top slurry protective layer are needed. When the aluminizing temperature exceeds 900°C, two layers of the bottom slurry protective layer and two layers of the top slurry protective layer are needed to achieve the best results.
[0031] In this embodiment, in step S3, the ethanol shellac is prepared by mixing 5-10g of shellac with 100-150ml of ethanol through stirring.
[0032] Specifically, this formulation can produce a shellac-based stock solution with appropriate viscosity. It avoids the problem of a film being too thin and prone to leakage due to an excessively low shellac content, while also preventing the slurry from becoming too viscous and clumping due to excessive shellac content, which would prevent it from being evenly applied to the irregular curved surfaces and corners of the tenon 13. This ensures that both the base and top protective layers of the slurry can be smoothly coated, guaranteeing the integrity and adhesion strength of the film. It also prevents the film from sticking to the precision mating surfaces of the tenon 13, facilitating subsequent cleaning.
[0033] In this embodiment, in step S3, the ratio of ethanol shellac to alumina in the bottom slurry protective layer is 3:1.
[0034] Specifically, the higher proportion of ethanol shellac as a binder ensures good slurry flow and smooth application. After molding, the coating is flexible and adheres to the surface of the tenon 13, making it less prone to peeling and falling off. The appropriate proportion of alumina powder fills the gaps inside the coating in sufficient quantities, effectively blocking the intrusion of aluminizing gaseous media into the substrate. This effectively prevents the coating from cracking and the formation of aluminizing channels, maintaining the integrity of the protective layer structure. During subsequent cleaning, the bottom slurry protective layer can be easily peeled off without any stubborn residue, without damaging the precision mating surface of the tenon 13, preserving the original dimensions and assembly accuracy.
[0035] In this embodiment, in step S3, the ratio of ethanol shellac to carbonyl nickel powder in the surface slurry protective layer is 1.5 to 2:1.
[0036] Specifically, relying on the characteristics of fine particle size, dense packing, and strong airtightness of carbonyl nickel powder, it can effectively seal the tiny air-permeable micropores of the bottom coating, forming a high-density airtight barrier layer. This significantly blocks the penetration of gaseous aluminizing media, enhances the overall anti-seepage effect, and prevents trace aluminum elements from penetrating into the tenon 13. In conjunction with the bottom slurry protective layer, it eliminates the interlayer aluminizing penetration channels, allowing the bottom physical barrier and the surface airtight sealing to form a synergistic anti-seepage system. This results in stronger overall protection, and subsequent cleaning is easy and easy to peel off without scratching or corroding the precision mating surface of the tenon 13.
[0037] In this embodiment, in step S3, the thickness of the bottom slurry protective layer is 3-4 mm, and the thickness of the top slurry protective layer is 1-2 mm.
[0038] Specifically, the total thickness of the bottom slurry protective layer is 3-4 mm, and the total thickness of the top slurry protective layer is 1-2 mm. A thick and stable basic protective layer is formed by alumina powder, and a dense gas-sealing layer is formed by carbonyl nickel powder. This precisely seals the fine pores in the bottom layer, forming a graded protective structure. This can effectively offset the thermal stress generated by the high temperature of aluminizing, reduce the problems of coating edge lifting, cracking, and peeling, and maintain the integrity and airtightness of the protective layer throughout the process, avoiding the formation of aluminizing penetration channels.
[0039] In this embodiment, in step S3, both the bottom protective slurry layer and the top protective slurry layer need to be cured by natural air drying or oven drying after application.
[0040] Specifically, the oven drying temperature is 60-80℃, and the drying time is 10-20 minutes. The curing method can fully evaporate the residual ethanol, avoiding the rapid vaporization of the solvent during high-temperature aluminizing, which would cause the coating to bubble, bulge, crack, and delaminate. It also promotes the full dehydration and shaping of the ethanol shellac, transforming it from a liquid slurry into a hard and dense solid protective film. This significantly improves the structural strength, surface hardness, and overall adhesion of the coating, ensuring that the coating adheres firmly to the surface of the tenon 13, making it less prone to peeling or flaking. Subsequent cleaning is also convenient, effectively protecting the precision mating surfaces and dimensional accuracy of the tenon 13.
[0041] In this embodiment, in step S3, before the tenon 13 is placed in the anti-seepage fixture 100, the anti-seepage fixture 100 is pre-filled with one-third alumina powder.
[0042] Specifically, by pre-filling a portion of the alumina powder, compared to directly filling the entire structure, the powder distribution is denser and more uniform, making it less prone to voids and gaps. This further enhances the heat insulation, gas barrier, and seepage prevention capabilities of the powder layer. It also prevents the tenon 13 from directly and rigidly contacting the inner wall of the seepage prevention fixture 100, effectively avoiding scratches and bumps to the tenon 13 assembly surfaces during installation, and perfectly protecting the original dimensional accuracy and surface finish of the tenon 13.
[0043] S4. Place the turbine blade 10, which has been properly protected against seepage in S3, into the aluminizing equipment for chemical vapor aluminizing. Specifically, the preferred aluminizing equipment is an aluminizing furnace, with an aluminizing temperature of 1030–1060℃ and a holding time of 4–7 hours; a dense, high-temperature, oxidation-resistant, and corrosion-resistant aluminate protective layer is formed at the aluminizing site; the aluminizing furnace is existing equipment, and its specific structure and working principle are common knowledge, so they will not be described in detail here.
[0044] S5. Clean the surface of the turbine blade 10 after aluminizing in S4. Specifically, surface cleaning involves first removing the protective coating by tapping, then using dry sandblasting or a grinding tool to remove residual powder from the non-aluminized parts of the turbine blade 10. For aluminized parts, hot water can be used to wipe away surface dust, followed by overall ultrasonic cleaning (using an ultrasonic cleaner). The protective coating is easy to clean, leaves no coating residue, causes no grinding damage, and does not harm the substrate, ensuring the subsequent assembly accuracy of the tenon 13. The alumina powder used to fill the gaps can be recycled for reuse.
[0045] S6, Inspection.
[0046] Specifically, the inspection includes checking the appearance of the parts, the aluminized areas, the transition zone and the non-aluminized areas, as well as the tempering color inspection. The appearance of the parts can be inspected visually or by using a 3D scanner to check for defects such as coating peeling and cracks on the surface of the turbine blade 10. The aluminized areas, the transition zone and the non-aluminized areas can be inspected visually to check for the presence of an aluminized layer. The tempering color inspection involves treating the parts at 500-650℃ for a preset time. After the color treatment, the aluminized layer is golden yellow and the non-aluminized areas are blue, confirming that the tenon 13 has no aluminized penetration and no deformation or damage.
[0047] Reference Figures 1 to 3 A seepage-proof tooling for turbine blade tenons is applied to the above-mentioned seepage-proof method for turbine blade tenons. The seepage-proof tooling 100 includes two cooperating alloy sleeves 110. The alloy sleeves 110 are provided with a contour limiting plate 120 that cooperates with the tenon groove of the tenon 13. Ear plates 130 are provided on both sides of the alloy sleeves 110. The two alloy sleeves 110 are connected by a connector.
[0048] Specifically, the alloy jacket 110 can be formed by sheet metal bending and welding, with a wall thickness of 1-1.5mm. The alloy jacket 110 can be U-shaped. The contouring limiting plate 120 is horizontally set, with one end connected to the inner wall of the alloy jacket 110 and the other end engaging with the tenon groove of the tenon 13. This effectively prevents the turbine blades 10 from rotating, tilting, or moving up and down inside the seepage prevention fixture 100, and reduces the gap between the seepage prevention fixture 100 and the tenon 13. Because the tenon 13 has a slurry protective layer, the seepage prevention fixture 100 and the tenon 13 will not stick together, thus avoiding... The two are in direct contact, and the subsequent filling of alumina powder results in a moderate filling amount and higher filling density, reducing gaps and further blocking the flow path of the aluminizing atmosphere, enhancing the auxiliary anti-seepage effect of the powder, and avoiding damage to the tenon 13 substrate by the anti-seepage tooling 100; the number of contour limiting plates 120 is adapted to the tenon groove of the tenon 13. In this embodiment, two contour limiting plates 120 are installed inside one alloy jacket 110; the connecting parts include, but are not limited to, bolt and nut, screw and nut connection methods; by installing the connecting parts on the ear plates 130 of the two alloy jackets 110, the two alloy jackets 110 are tightly connected.
[0049] In this embodiment, the tenon 13 of the turbine blade 10 is placed inside the alloy jacket 110, so that the tenon groove of the tenon 13 matches the contour limiting plate 120, and then the two alloy jackets 110 are tightly connected by a connector. The seepage prevention tooling 100 of the present invention has a simple structure, is easy to assemble and disassemble, and has low labor intensity. Compared with the special clamps required in the traditional seepage prevention process, it greatly reduces the production cost. Moreover, the alloy jacket 110 can be made longer to directly install a row of turbine blades 10, thereby improving work efficiency.
[0050] Reference Figures 1 to 3 In this embodiment, the alloy jacket 110 has an opening 140, and there is a gap between the alloy jacket 110 and the turbine blade 10 at the opening 140, through which alumina powder is filled.
[0051] Specifically, the opening 140 facilitates the extension of the alloy jacket 110 from the rim plate 12, thereby facilitating the fit between the turbine blade 10 and the alloy jacket 110. After the alloy jacket 110 is closed and locked, it does not need to be disassembled again. Alumina powder can be directly added to the interior through the opening 140, simplifying the powder filling process, significantly improving the clamping and protection efficiency of the parts, adapting to mass production, and allowing the filling status to be visible from the outside. Powder can be added as needed to ensure that the alumina powder filling compactness meets the standards. After aluminizing is completed, the alumina powder inside the alloy jacket 110 can be quickly poured out directly through the opening 140, making the cleaning of residual powder simple and efficient. The interior of the alloy jacket 110 is not prone to dust accumulation and clumping, making maintenance convenient and extending the cycle service life of the anti-seepage tooling 100.
[0052] Reference Figures 1 to 3 In this embodiment, the alloy jacket 110 is made of MAR-M247 alloy, In718 alloy or other nickel-based high-temperature alloy materials.
[0053] Specifically, the anti-seepage tooling 100 is made of MAR-M247 alloy, In718 alloy, or other nickel-based high-temperature alloy materials. MAR-M247 alloy, In718 alloy, or other nickel-based high-temperature alloy materials have extremely high temperature resistance, can withstand the high-temperature environment of the aluminizing process for a long time, are not prone to softening, creep, or deformation, and have extremely strong resistance to oxidation and aluminizing gas phase media erosion. They are not prone to oxidation, peeling, corrosion, or rust in the aluminizing furnace, thus preventing impurities from peeling off and contaminating the turbine blades 10 on the surface of the anti-seepage tooling 100. At the same time, it greatly extends the cycle life of the anti-seepage tooling 100 and reduces replacement costs.
[0054] In this embodiment, after filling the gaps with alumina powder in step S3, the sealing of each interface can be visually inspected, and it is acceptable if there are no gaps.
[0055] Reference Figure 4 The upper black area is surface a, and the lower layer is the substrate b. It can be seen that the non-aluminized part of tenon 13 has no aluminized layer.
[0056] Reference Figure 5 From top to bottom, the components are surface a, external aluminized layer c, diffusion layer d, and substrate b. The aluminized layer includes external aluminized layer c and diffusion layer d. It can be seen that the aluminized part of the blade 11 has an aluminized layer. The thickness of the aluminized layer is the thickness of diffusion layer d plus the thickness of external aluminized layer c. This proves that the anti-seepage method and anti-seepage tooling of the present invention are effective.
[0057] The seepage prevention method of the present invention can effectively protect the non-seepage parts of the turbine blade 10 at a temperature of 800-1065℃ (especially 1040-1065℃). The protected non-seepage parts are free from leakage. The seepage prevention method of the present invention solves the problems of low efficiency and long cycle of traditional seepage prevention processes, greatly shortens the production cycle of seepage prevention, and improves the enterprise's profits.
[0058] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.
[0059] Furthermore, it should be noted that the scope of the methods and apparatus in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.
[0060] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.
Claims
1. A method for preventing seepage in turbine blade tenons, characterized in that, Includes the following steps: S1. Clean the turbine blades, then blow dry the surface of the turbine blades, and put the turbine blades into an oven to dry. S2. Sandblast the aluminized parts of the turbine blades; S3. Apply a base layer of protective slurry made of ethanol shellac and alumina to the surface of the tenon. Then apply a top layer of protective slurry made of ethanol shellac and nickel carbonyl powder to the surface of the base layer of protective slurry. Place the tenon coated with the top layer of protective slurry in the anti-seepage fixture and fill the gap between the anti-seepage fixture and the tenon with alumina powder. S4. Place the turbine blades that have been properly protected against seepage in S3 into the aluminizing equipment for chemical vapor aluminizing. S5. Clean the surface of the turbine blades after aluminizing in S4. S6, Inspection.
2. The method for preventing seepage in turbine blade tenons according to claim 1, characterized in that, In step S3, the ethanol shellac is prepared by mixing 5-10g of shellac with 100-150ml of ethanol through stirring.
3. The method for preventing seepage in turbine blade tenons according to claim 1, characterized in that, In step S3, the ratio of ethanol shellac to alumina in the bottom slurry protective layer is 3:
1.
4. The method for preventing seepage in turbine blade tenons according to claim 1, characterized in that, In step S3, the ratio of ethanol shellac to carbonyl nickel powder in the surface slurry protective layer is 1.5 to 2:
1.
5. The method for preventing seepage in turbine blade tenons according to claim 1, characterized in that, In step S3, the thickness of the bottom slurry protective layer is 3-4 mm, and the thickness of the top slurry protective layer is 1-2 mm.
6. The method for preventing seepage in turbine blade tenons according to claim 1, characterized in that, In step S3, after the bottom slurry protective layer and the top slurry protective layer are applied, they must be cured by natural air drying or oven drying.
7. The method for preventing seepage in turbine blade tenons according to claim 1, characterized in that, In step S3, before the tenon is placed in the seepage-proof fixture, the seepage-proof fixture is pre-filled with one-third alumina powder.
8. A seepage-proof tooling for turbine blade tenons, applied to the seepage-proofing method for turbine blade tenons as described in claim 1, characterized in that, The seepage-proof tooling includes two cooperating alloy jackets. Inside each alloy jacket is a contour-fitting limiting plate that mates with the tenon groove of the tenon. Ear plates are provided on both sides of each alloy jacket. The two alloy jackets are connected by a connector.
9. The anti-seepage tooling for turbine blade tenons according to claim 8, characterized in that, The alloy jacket has openings, and there is a gap between the alloy jacket and the turbine blade at the openings, through which alumina powder is filled.
10. The anti-seepage tooling for turbine blade tenons according to claim 9, characterized in that, The alloy jacket is made of MAR-M247 alloy, In718 alloy or other nickel-based high-temperature alloy materials.