A vinyl-glass ceramic composite anti-seepage coating and its preparation method and application

Abstract

The present invention discloses a vinyl-glass ceramic composite anti-seepage coating and its preparation method and application, which includes a vinyl coating I applied to the surface of a metal substrate and a glass ceramic coating II applied on the vinyl coating I; the vinyl coating I includes 10-30% Ni powder, 10-30% ZrO2 powder by mass percentage, and the rest is vinyl resin; the glass ceramic coating includes 15-25% Al2O3 powder, 8-10% B2O3 powder, 8-10% Na2O powder, 3-8% MgO powder, 2-6% CaO powder, 4-6% TiO2 powder, 5-8% ZrO2 powder, and the rest is SiO2 powder. The present invention can effectively hinder the internal diffusion of the penetrant, has a good anti-seepage effect at 800-1000 ° C, and can ensure peelability at room temperature without damaging the substrate surface, so as to achieve an anti-seepage effect while having the effect of protecting the substrate.

Description

Technical Field

[0001] The present invention relates to a protective coating, in particular to a composite anti-seepage coating used in an aluminizing process, and a preparation method and application thereof. Background Art

[0002] During the aluminizing process, turbine blades are partially coated with an impermeable shielding coating. This coating prevents the deposition and diffusion of active aluminum into the substrate, thereby protecting the substrate from damage. It also ensures that the coating can be removed after high-temperature heat treatment to maintain the high strength-toughness match and fatigue performance of the blade tenon.

[0003] The aluminizing process often relies on the migration and deposition of halide gases. During this process, the anti-seepage shielding layer will face severe high-temperature atomization damage and be affected by active Cl - Ion corrosion. Long-term exposure to high-temperature corrosion will cause corrosion pits on the coating surface, which will expand into cracks, allowing halide gases to penetrate and resulting in poor anti-seepage effectiveness during the aluminizing process. Current industrially used anti-seepage shielding coatings have shortcomings such as an unsatisfactory operating temperature range, poor low-temperature density, poor shedding resistance, and unstable high-temperature protection.

[0004] Therefore, the research on anti-seepage shielding coatings with low densification temperature, good high temperature resistance and precise control of shedding is of great significance for achieving local avoidance of aluminization and oxidation of nickel-based alloys during aluminization, improving the protection ability of anti-seepage shielding coatings on metal workpieces during heat treatment and hot working processes, saving energy and promoting scientific and technological development strategies. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies and defects mentioned in the above background technology and provide a vinyl-glass ceramic composite anti-seepage coating and its preparation method and application to improve the anti-seepage performance, high temperature resistance and peelability.

[0006] In order to solve the above technical problems, the technical solution proposed by the present invention is:

[0007] A vinyl-glass ceramic composite anti-seepage coating, comprising a vinyl coating I coated on the surface of a metal substrate, and a glass ceramic coating II coated on the vinyl coating I;

[0008] The vinyl coating I comprises, by mass percentage, 10-30 wt.% of Ni powder and 10-30 wt.% of ZrO2 powder, and the rest is vinyl resin, which totals 100%;

[0009] The glass ceramic coating II is prepared by the following method: glass ceramic raw material powders are mixed uniformly and heated to a molten state, and then water quenched to obtain a glass ceramic block; the glass ceramic block is ground to obtain a glass ceramic powder; a binder is added to the glass ceramic powder and stirred uniformly to make it viscous to obtain the glass ceramic coating II;

[0010] The glass ceramic raw material powder includes, by mass percentage, 15-25wt.% of Al2O3 powder, 8-10wt.% of B2O3 powder, 8-10wt.% of Na2O powder, 3-8wt.% of MgO powder, 2-6wt.% of CaO powder, 4-6wt.% of TiO2 powder, 5-8wt.% of ZrO2 powder, and the rest is SiO2 powder, totaling 100%.

[0011] As a further improvement, the mass percentage of Ni powder in the vinyl coating I is 20-30 wt.%, and the mass percentage of ZrO2 powder is 20-30 wt.%.

[0012] As a further improvement, the binder is a polyethylene glycol solution, and the amount added is 4 to 6 wt.% of the mass of the glass ceramic powder.

[0013] The present invention also provides a method for preparing a vinyl-glass ceramic composite anti-seepage coating, comprising the following steps:

[0014] (1) Preparation of Vinyl Coating I: Ni powder and ZrO2 powder are uniformly mixed in vinyl resin to obtain vinyl coating I; the Ni powder is 10-30 wt.%, the ZrO2 powder is 10-30 wt.%, and the rest is vinyl resin, totaling 100%;

[0015] (2) Preparation of glass ceramic coating II: glass ceramic raw material powders are mixed uniformly and heated to a molten state, and then water quenched to obtain a glass ceramic block; the glass ceramic block is ground to obtain a glass ceramic powder; a binder is added to the glass ceramic powder and stirred uniformly to make it viscous to obtain glass ceramic coating II;

[0016] The glass ceramic raw material powder includes, by mass percentage, 15-25 wt.% of Al2O3 powder, 8-10 wt.% of B2O3 powder, 8-10 wt.% of Na2O powder, 3-8 wt.% of MgO powder, 2-6 wt.% of CaO powder, 4-6 wt.% of TiO2 powder, 5-8 wt.% of ZrO2 powder, and the rest is SiO2 powder, which totals 100%;

[0017] (3) Preparation of vinyl-glass ceramic composite anti-seepage coating: Vinyl coating I is coated on the surface of the metal substrate and dried, and then glass ceramic coating II is coated on the vinyl coating I and dried to obtain a vinyl-glass ceramic composite anti-seepage coating.

[0018] As a further improvement, the binder is a polyethylene glycol solution, and the amount added is 4 to 6 wt.% of the mass of the glass ceramic powder.

[0019] As a further improvement, the heating to a molten state in step (2) is heating to 1400-1500° C. and keeping the temperature for 1-2 hours.

[0020] As a further improvement, the drying temperature in step (3) is 40-60°C.

[0021] The present invention also provides an application of the vinyl-glass ceramic composite anti-seepage coating in an aluminizing process.

[0022] As a further improvement, the metal matrix is ​​a nickel-based high-temperature alloy.

[0023] As a further improvement, the aluminizing process temperature is 800-1000°C.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The vinyl-glass ceramic composite coating of the present invention is applied to the surface of a metal substrate. The composite coating is evenly coated and can effectively hinder the internal diffusion of the penetrant. It has a good anti-seepage effect at 800-1000°C and has good thermal shock resistance. It is not easy to decompose and break under high temperature conditions. At the same time, it can ensure the peelability under room temperature conditions without damaging the surface of the substrate, so as to achieve the anti-seepage effect while protecting the substrate, providing a good protection effect for "forbidden areas" such as turbine blade tenons, reducing subsequent processing and lowering the cost of use. The method is simple and reliable and can be used for large-scale production. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 This is the macroscopic morphology of the vinyl-glass ceramic composite anti-seepage coating prepared in Example 2 applied on the surface of a metal substrate;

[0028] Figure 2 is the XRD spectrum of the anti-seepage area and the seepage area on the surface of the metal substrate after aluminization in Example 2;

[0029] Figure 3This is the XPS spectrum of the anti-seepage area and the seepage area on the surface of the metal substrate after aluminization in Example 2;

[0030] Figure 4 is the EDS spectrum of the anti-seepage area and the seepage area on the surface of the metal substrate after aluminization in Example 2;

[0031] Figure 5 This is a sample obtained by applying the vinyl anti-seepage coating prepared in Example 1 to the surface of a metal substrate and then undergoing aluminizing heat treatment. DETAILED DESCRIPTION

[0032] To facilitate understanding of the present invention, the present invention will be described in more comprehensive and detailed form below in conjunction with the accompanying drawings and preferred embodiments. However, the protection scope of the present invention is not limited to the following specific embodiments.

[0033] Unless otherwise defined, all technical terms used hereinafter have the same meanings as those generally understood by those skilled in the art. The technical terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of the present invention.

[0034] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or prepared by existing methods.

[0035] The vinyl-glass ceramic composite anti-seepage coating of the present invention comprises: a vinyl coating I coated on the surface of a metal substrate, and a glass ceramic coating II coated on the vinyl coating I.

[0036] The preparation method of the vinyl-glass ceramic composite anti-seepage coating according to some specific embodiments of the present invention comprises the following steps:

[0037] (1) Preparation of Vinyl Coating I:

[0038] The vinyl coating I includes, by mass percentage, 10 to 30 wt.% (preferably 20 to 30 wt.%) of Ni powder, 10 to 30 wt.% (preferably 20 to 30 wt.%) of ZrO2 powder, and the rest is vinyl resin, totaling 100%.

[0039] Ni powder and ZrO2 powder are uniformly mixed in vinyl resin to obtain vinyl coating I.

[0040] In some embodiments, the Ni powder has a particle size of 40 to 80 μm, and the ZrO 2 powder has a particle size of 5 to 10 μm.

[0041] The present invention achieves strippability by adjusting the coating composition. Vinyl coating I provides strippability, can protect the substrate during the heating process, and can be manually peeled off after cooling.

[0042] The addition of Ni powder can not only effectively enhance the thermal shock resistance of the coating, but also the presence of Ni element can react with active Al atoms, thereby reducing the possibility of diffusion into the interior.

[0043] The addition of ZrO2 particles improves high-temperature stability and post-aluminization exfoliation, enhancing thermal shock resistance and improving the coating's resistance to isothermal oxidation and corrosion. ZrO2 undergoes a phase transition from tetragonal to monoclinic at high temperatures. This phase transition absorbs significant energy, increasing the coating's toughness and crack resistance, effectively enhancing thermal shock resistance. Furthermore, ZrO2 particles form a barrier within the coating, hindering the diffusion of oxygen and oxide ions, slowing the oxidation process and protecting the substrate from high-temperature oxidation. In high-temperature oxidizing environments, ZrO2 forms a stable oxide protective layer. This protective film prevents further oxidation and acts as an insulator, thereby enhancing oxidation resistance. Furthermore, ZrO2 particles fill micropores and defects in the coating, making it denser. This dense structure effectively blocks the penetration of corrosive media, thereby enhancing the coating's corrosion resistance. Furthermore, ZrO2 exhibits excellent chemical stability, making it resistant to attack by acids, bases, and other corrosive chemicals.

[0044] (2) Preparation of glass ceramic coating II:

[0045] The glass ceramic raw material powder includes, by mass percentage, 15-25wt.%, 8-10wt.%, 8-10wt.%, 8-10wt.%, 3-8wt.%, 2-6wt.%, 2-6wt.%, 4-6wt.%, 5-8wt.%, and SiO2 powder, the rest being 100%.

[0046] The glass ceramic raw material powders are mixed uniformly, heated to a molten state, and then water-quenched to obtain a glass ceramic block. The glass ceramic block is ground to obtain a glass ceramic powder. A binder is added to the glass ceramic powder and stirred uniformly until it becomes viscous, thereby obtaining a glass ceramic coating II.

[0047] In some embodiments, the glass ceramic powder is heated to 1400-1500° C. and kept at this temperature for 1-2 hours to become a molten state.

[0048] In some embodiments, the binder is a polyethylene glycol solution (preferably a ratio of polyethylene glycol to water of 4 to 6:100), and the amount added is 4 to 6 wt.% of the mass of the glass ceramic powder.

[0049] In some embodiments, the "mixing the glass ceramic raw material powders uniformly" is performed by ball milling at a rotation speed of 100 to 300 r / min. The "grinding the glass ceramic block" is performed by ball milling at a rotation speed of 200 to 300 r / min.

[0050] Glass ceramic coating II mainly provides protection under high temperature conditions. Glass ceramic coating II gradually softens and melts during the heating process to form a continuous and dense protective layer, isolating the outside world from the substrate, and has the function of cladding and barrier physical isolation. During the aluminizing process, the anti-seepage shielding layer is in a high-temperature atomization environment and is easily affected by active Cl - Ion corrosion. The glass ceramic coating II of the present invention can exhibit higher oxidation resistance and corrosion resistance under high temperature conditions, and is not easy to react with corrosive elements such as Al, O, and Cl under high temperature conditions.

[0051] Glass-ceramic Coating II and Vinyl Coating I are well-compatible. However, if Vinyl Coating I is applied alone without Glass-ceramic Coating II, it will decompose after high-temperature aluminization. This is primarily due to corrosion from corrosive elements, which causes the coating to decompose. Furthermore, aluminization efficiency is severely affected. Vinyl Coating I flows under high temperatures, leaving Ni and ZrO2 powder on the surface of the block, making it difficult for Al to penetrate. Therefore, applying Vinyl Coating I alone not only yields poor anti-seepage effectiveness but also significantly reduces Alization efficiency.

[0052] (3) Preparation of vinyl-glass ceramic composite anti-seepage coating:

[0053] A vinyl coating I is coated on the surface of a metal substrate and dried, and then a glass ceramic coating II is coated on the vinyl coating I and dried to obtain a vinyl-glass ceramic composite anti-seepage coating.

[0054] In some embodiments, the metal substrate is pretreated, which includes removing the oxide film on the surface of the metal substrate and ultrasonically cleaning it in anhydrous ethanol.

[0055] In some embodiments, the drying temperature is 40-60° C., and the coating and drying steps are repeated 2-3 times.

[0056] The composite anti-seepage coating of the present invention can be evenly coated on the surface of a metal substrate, has a good anti-seepage effect at 800-1000° C., and can be peeled off at room temperature without damaging the substrate surface.

[0057] In the application context of turbine blades, the composite anti-seepage coating of the present invention can effectively hinder the internal diffusion of the penetrant, ensuring the anti-seepage effect and peelability without reacting with the substrate, which is beneficial to improving the mechanical properties of turbine blades and reducing their production time and cost.

[0058] Compared with the traditional single anti-seepage coating, the present invention significantly improves its high temperature resistance and anti-seepage performance, and can be manually peeled off. The method is simple, reliable, easy to operate, has broad application prospects, and can be used for large-scale production.

[0059] Example 1: Preparation of Coating I and Coating II

[0060] (1) Preparation of Vinyl Coating I:

[0061] To prepare 100 g of vinyl coating I, the weight percentage of the components is 25% Ni powder, 25% ZrO2 powder, and 50% vinyl resin. 25 g of Ni powder is added to 50 g of vinyl resin, stirred to form a mixed solution, and then allowed to stand for 30 minutes. 25 g of ZrO2 powder is then added to the mixed solution, stirred further to form a mixed solution, and allowed to stand for 30 minutes to obtain the prepared vinyl coating I.

[0062] (2) Preparation of glass ceramic coating II:

[0063] To prepare 100g of glass-ceramic coating II, weigh 20g of Al2O3 powder, 10g of B2O3 powder, 10g of Na2O powder, 5g of MgO powder, 5g of CaO powder, 5g of TiO2 powder, 5g of ZrO2 powder, and 40g of SiO2 powder, according to the weight ratio. Place the weighed powders into a zirconia ball milling jar, add 1.2 times the weight of zirconia ball milling beads, and add alcohol to mix thoroughly, covering the surface. Place the jar in a drum-type ball mill at 150 rpm for 2 hours to ensure uniform distribution of the mixed powders.

[0064] After the glass ceramic powder is air-dried, it is placed in a melting furnace and heated to 1450°C for 1 hour. The molten glass ceramic is water-quenched to obtain a glass ceramic block. The glass ceramic block is added to a zirconia ball mill jar, and 1.2 times the mass ratio of zirconia ball mill beads is added. Alcohol is added and stirred to cover the surface. Place it on a planetary ball mill and rotate at 250r / min for 24 hours to fully grind the glass ceramic powder. The ground glass ceramic powder is then placed in a vacuum drying oven and kept at 60°C for 4 hours to obtain dry glass ceramic powder.

[0065] 5 g of polyethylene glycol was weighed and added to 100 g of distilled water to completely dissolve the mixture to obtain a polyethylene glycol solution. 5 g of the polyethylene glycol solution was weighed and added to 100 g of glass ceramic powder and stirred until the mixture became viscous, thereby obtaining a prepared coating II.

[0066] Example 2: Preparation of vinyl-glass ceramic composite coating

[0067] The oxide film on the surface of the metal substrate (nickel-based high-temperature alloy Ni-8Cr-10Co-11W-2Ti-5Al) was removed by sandpaper polishing, and then the substrate was placed in anhydrous ethanol and ultrasonically cleaned for 10 minutes, which was repeated 2 to 3 times.

[0068] Half of the treated metal substrate surface was coated with the vinyl coating I prepared in Example 1, while the other half remained uncovered for comparison. The metal substrate was dried in a 50°C drying oven for 30 minutes, and the coating and drying process were repeated three times. Next, the glass-ceramic coating II prepared in Example 1 was applied to the metal substrate over Coating I, while the other half remained uncovered for comparison. The metal substrate was dried in a 50°C drying oven for 30 minutes, and the coating and drying processes were repeated three times. After cooling to room temperature, a vinyl-glass-ceramic composite coating was obtained.

[0069] Comparative Example 1: Preparation of vinyl anti-seepage coating

[0070] The oxide film on the surface of the metal substrate (nickel-based high-temperature alloy Ni-8Cr-10Co-11W-2Ti-5Al) was removed by sandpaper polishing, and then the substrate was placed in anhydrous ethanol and ultrasonically cleaned for 10 minutes, which was repeated 2 to 3 times.

[0071] Vinyl coating I prepared in Example 1 was brush-coated on half of the treated metal substrate surface. The metal substrate was dried in a 50°C drying oven for 30 minutes, and the brush coating and drying were repeated three times. After cooling to room temperature, a vinyl barrier coating was obtained.

[0072] Application example: Embedded aluminizing experiment

[0073] The coated metal substrates from Example 2 and Comparative Example 1 were subjected to a 900°C embedded aluminizing experiment. The coated high-temperature alloy was cut into 10 mm x 10 mm x 5 mm specimens. The specimens were polished with 320#, 800#, 1200#, and 2000# sandpaper, cleaned with acetone, and then dried. The filler consisted of 25 wt.% Al powder as an infiltrant, 5 wt.% CaCl2 powder, 69 wt.% Al2O3 powder, and 1 wt.% CeO2. The Al2O3 powder was calcined at 1200°C for 2 hours to remove low-melting-point substances. The filler was placed halfway into an alumina crucible, and the coated metal substrates from Example 2 and Comparative Example 1 were placed there. The filler was then added to fill the alumina crucible and the lid was closed to ensure a tight bond between the filler and the metal substrate. The sealed alumina crucible was heated at high temperature under a flowing Ar2 atmosphere. The specimens were heated at 900°C for 4 hours, then heated at a rate of 5°C / min in an Ar2 atmosphere, and then cooled in the furnace.

[0074] Figure 1It is the macroscopic morphology of the vinyl-glass ceramic composite anti-seepage coating prepared in Example 2 applied to the surface of the metal substrate. Among them: (a) is the sample after the composite anti-seepage coating is coated and dried, one side of the alloy block is not treated, and the other layer is coated with a composite anti-seepage shielding layer. (b) is the sample after the alloy block has been subjected to aluminizing heat treatment. The anti-seepage shielding layer did not fall off after the aluminizing treatment at 900℃×4h. (c) is the macroscopic morphology of the alloy block after the surface anti-seepage shielding layer was manually peeled off. (d) The anti-seepage alloy block was observed using the SEM-BSE mode, and there was an obvious contrast difference between the untreated and treated areas, indicating that there were obvious differences in the alloy composition, proving that the composite anti-seepage shielding coating has a good anti-seepage effect.

[0075] Figure 2 right Figure 1 XRD analysis of the non-impermeable and impermeable areas in (d) reveals that the surface of the non-impermeable area is primarily composed of NiAl, while the impermeable area is characterized by a solid solution of γ-Ni (red line). This demonstrates that the composite impermeable shielding coating has a good impermeability effect and does not damage the high-temperature alloy structure.

[0076] Figure 3 right Figure 1 XPS analysis of the non-impermeable and impermeable areas in (d) reveals that the Al 2p peak on the surface of the non-impermeable area is significantly higher than that of the impermeable area, indicating the presence of a large amount of Al on the surface. This suggests that the composite impermeable shielding coating can hinder the internal diffusion of Al.

[0077] Figure 4 right Figure 1 In (d), EDS surface scanning analysis was performed on the non-anti-seepage area and the anti-seepage area. The non-anti-seepage area has obvious aggregation of Ni and Al elements, and there is a clear boundary between the non-anti-seepage area and the anti-seepage area.

[0078] The macroscopic morphology of the alloy block after the aluminizing treatment in comparative example 1 is as follows: Figure 5 The results showed that the vinyl anti-seepage shielding coating had fallen off after aluminizing, resulting in poor anti-seepage effectiveness under high-temperature conditions. Furthermore, it tended to flow during heating, resulting in poor aluminizing results. This was primarily attributed to the Ni and ZrO2 powders in the vinyl coating flowing into the non-aluminized areas, hindering the aluminizing process.

[0079] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any form. Therefore, any simple modifications, equivalent variations, and modifications to the above embodiments that do not depart from the technical solution of the present invention and are based on the technical essence of the present invention shall fall within the scope of protection of the technical solution of the present invention.

Claims

1. A vinyl-glass ceramic composite anti-seepage coating, characterized in that: The invention comprises a vinyl coating layer I coated on the surface of a metal substrate, and a glass ceramic coating layer II coated on the vinyl coating layer I; The vinyl coating I comprises, by mass percentage, 10-30 wt.% of Ni powder and 10-30 wt.% of ZrO2 powder, and the rest is vinyl resin, which totals 100%; The glass ceramic coating II is prepared by the following method: glass ceramic raw material powders are mixed uniformly and heated to a molten state, and then water quenched to obtain a glass ceramic block; the glass ceramic block is ground to obtain a glass ceramic powder; a binder is added to the glass ceramic powder and stirred uniformly to make it viscous to obtain the glass ceramic coating II; The glass ceramic raw material powder includes, by mass percentage, 15-25wt.% of Al2O3 powder, 8-10wt.% of B2O3 powder, 8-10wt.% of Na2O powder, 3-8wt.% of MgO powder, 2-6wt.% of CaO powder, 4-6wt.% of TiO2 powder, 5-8wt.% of ZrO2 powder, and the rest is SiO2 powder, totaling 100%.

2. The vinyl-glass ceramic composite anti-seepage coating according to claim 1, characterized in that: The mass percentage of Ni powder in the vinyl coating I is 20-30 wt.%, and the mass percentage of ZrO2 powder is 20-30 wt.%.

3. The vinyl-glass ceramic composite anti-seepage coating according to claim 1 or 2, characterized in that: The binder is a polyethylene glycol solution, and the amount added is 4-6 wt.% of the mass of the glass ceramic powder.

4. A method for preparing a vinyl-glass ceramic composite anti-seepage coating, characterized in that: The following steps are included: (1) Preparation of Vinyl Coating I: Ni powder and ZrO2 powder are uniformly mixed in vinyl resin to obtain vinyl coating I; the Ni powder is 10-30 wt.%, the ZrO2 powder is 10-30 wt.%, and the rest is vinyl resin, totaling 100%; (2) Preparation of glass ceramic coating II: glass ceramic raw material powders are mixed uniformly and heated to a molten state, and then water quenched to obtain a glass ceramic block; the glass ceramic block is ground to obtain a glass ceramic powder; a binder is added to the glass ceramic powder and stirred uniformly to make it viscous to obtain glass ceramic coating II; The glass ceramic raw material powder includes, by mass percentage, 15-25 wt.% of Al2O3 powder, 8-10 wt.% of B2O3 powder, 8-10 wt.% of Na2O powder, 3-8 wt.% of MgO powder, 2-6 wt.% of CaO powder, 4-6 wt.% of TiO2 powder, 5-8 wt.% of ZrO2 powder, and the rest is SiO2 powder, which totals 100%; (3) Preparation of vinyl-glass ceramic composite anti-seepage coating: Vinyl coating I is coated on the surface of the metal substrate and dried, and then glass ceramic coating II is coated on the vinyl coating I and dried to obtain a vinyl-glass ceramic composite anti-seepage coating.

5. The preparation method according to claim 4, characterized in that The binder is a polyethylene glycol solution, and the amount added is 4-6 wt.% of the mass of the glass ceramic powder.

6. The preparation method according to claim 4, characterized in that The heating to the molten state in step (2) is heating to 1400-1500° C. and keeping the temperature for 1-2 hours.

7. The preparation method according to claim 4, characterized in that The drying temperature in step (3) is 40-60°C.

8. Use of the vinyl-glass ceramic composite anti-seepage coating according to any one of claims 1 to 3 or the vinyl-glass ceramic composite anti-seepage coating prepared according to any one of claims 4 to 7 in an aluminizing process.

9. The use according to claim 8, characterized in that The metal matrix is ​​a nickel-based high-temperature alloy.

10. The use according to claim 8, characterized in that The aluminizing process temperature is 800-1000°C.

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