High-temperature oxidation resistant coating as well as use method and application thereof

Abstract

The invention discloses a high-temperature oxidation resistant coating as well as a use method and application thereof. The solute of the coating comprises 33%-40% of Al2O3, 42%-49% of SiO2, 8%-14% of Fe3O4, 3%-8% of SiC and 5%-7% of (Y2O3 + ZrO2), the proportion of Y2O3 in the (Y2O3 + ZrO2) is 5%-9%, and a solvent is distilled water. When the coating and the using method are applied to homogenization pretreatment of the nickel-based superalloy, the homogenization treatment time of the superalloy in a heat treatment furnace can be effectively prolonged, erosion and oxidation of high-temperature furnace gas to the surface of a steel ingot are avoided, subcutaneous oxidation cracks and element depletion are reduced, and the quality of the steel ingot is improved. And the method has positive influence on the surface grinding efficiency of the homogenized steel ingot, tool loss and other procedures.

Description

Technical Field

[0001] The invention relates to a high temperature oxidation resistant coating and a use method and application thereof, and relates to the field of high temperature alloys. Background Art

[0002] In the field of high-temperature alloys, the high-temperature stability and oxidation resistance of materials are key technical challenges. Before forging, the long homogenization process of high-temperature alloys will cause internal and external oxidation of the alloy material, resulting in a decrease in the material's processing performance. During forging, subcutaneous cracks will cause cracking during forging, which is not conducive to the smooth progress of hot processing. On the one hand, it affects the product production specifications, and on the other hand, it affects the quality and reliability of the final product. In order to solve this problem, it is particularly important to develop a coating or coating technology that can effectively prevent the oxidation of high-temperature alloys during the heating process.

[0003] Traditional high-temperature protective coatings, such as the first-generation thermal diffusion coatings and the second-generation M (M = Fe, Ni or Co) CrAlY cladding coatings, provide anti-oxidation protection to a certain extent. However, with the increasing requirements for engine efficiency and energy conservation and emission reduction, the alloy materials themselves need to be processed at higher temperatures, and these coatings have gradually failed to meet the higher operating temperatures and anti-oxidation requirements. Although the new generation of thermal barrier coatings has effectively improved the temperature bearing capacity, on the one hand, the mutual diffusion between the coating and the substrate and the stability of the anti-oxidation film are still insufficient, and the high cost leads to its general use in finished hot end parts, and its use in the material processing process significantly affects the production cost.

[0004] For example, patent document CN101037552A discloses a high-temperature alloy coating for hot parts of gas turbines. Specifically, it is an alloy coating whose main components are cobalt, nickel, chromium, aluminum and yttrium. The specific components are: cobalt: balance; nickel: 31.0%-33.0%; chromium: 20.0%-22.0%; aluminum: 7.0%-9.0%; yttrium: 0.35%-0.65%; and impurities are: carbon <0.02%; hydrogen <0.005%; nitrogen <0.010%; oxygen <0.040%; phosphorus <0.010%; sulfur <0.010%; all other impurities <0.50%. Compared with existing high-temperature alloy protective coatings, it has a more durable ability to resist high-temperature oxidation and high-temperature corrosion, and can also avoid cracking problems.

[0005] For example, patent document CN117645805A discloses an anti-oxidation coating applied to heat treatment of steel alloy slabs, the composition and mass ratio of the coating include: solid powder ratio: 85%-92% magnesia, 0.5%-5% chromium trioxide, 2%-5% sodium tripolyphosphate, 1%-4% industrial aluminum powder, 0.1-1% graphite; and 2%-4% sodium polyacrylate, 4%-5% silica sol solution, 15%-25% water accounting for the mass of the above solid powder; and Fe2O3 powder, the mass ratio of the Fe2O3 powder is within 3% of the mass of the solid powder. The coating is prepared with industrial magnesia as the main raw material, and a small amount of pigment-grade chromium trioxide, industrial aluminum powder, silica sol and inorganic and organic binders are added. It has low cost and good anti-oxidation performance.

[0006] It can be seen that the research on anti-oxidation coatings for high-temperature and complex environments has been quite extensive, and the composition requirements of anti-oxidation coatings in different application scenarios are also different. This solution is specifically aimed at the homogenization treatment during the smelting process of high-temperature alloys, and proposes an anti-oxidation coating specifically used to inhibit internal and external oxidation. Its unique composition can effectively cope with various challenges in high-temperature oxidizing environments. Summary of the invention

[0007] The main purpose of the present invention is to provide a coating for reducing the degree of oxidation during the homogenization process of a high-temperature alloy and the application of the coating in the homogenization process of a high-temperature alloy.

[0008] In terms of mass percentage, the solutes include Al2O3: 33-40%, SiO2: 42-49%, Fe3O4: 8-14%, SiC: 3-8%, 5-7% (Y2O3+ZrO2); the proportion of Y2O3 in (Y2O3+ZrO2) is 5-9%, and the rest is ZrO2 and other inevitable impurities.

[0009] Furthermore, the solute includes Al2O3: 34%-36%, SiO2: 42%-45%, Fe3O4: 9%-10%, SiC: 6-8%, 5.5-6.5% (Y2O3+ZrO2), wherein the proportion of Y2O3 in (Y2O3+ZrO2) is 7-8.5%, and the rest is ZrO2 and other inevitable impurities.

[0010] Furthermore, the solvent is water.

[0011] Furthermore, the volume ratio of solute to solvent is 1:1.8-2.3.

[0012] A method for using the high temperature oxidation resistant coating is also proposed, comprising:

[0013] The solute is prepared with the following chemical components, which contain, by mass percentage, Al2O3: 33-40%, SiO2: 42-49%, Fe3O4: 8-14%, SiC: 3-8%, 5-7% (Y2O3+ZrO2); wherein

[0014] In (Y2O3+ZrO2), the proportion of Y2O3 is 5-9%, and the rest is ZrO2 and other inevitable impurities;

[0015] The solute is mixed with water at 46-60°C to obtain a coating.

[0016] The coating is applied to the surface of the steel ingot to be treated.

[0017] Furthermore, the process of pre-treating the steel ingot includes: heating and baking the steel ingot coated with the coating, the baking temperature is 180-250° C., and the baking time is 30-45 minutes.

[0018] Furthermore, the process of pre-treating the steel ingot includes: wrapping the baked steel ingot with a steel belt.

[0019] Furthermore, the steel strip has a thickness of 0.1-0.25 mm and a width of 150-350 mm.

[0020] Furthermore, the volume ratio of solute to water is 1:1.8-2.3.

[0021] Furthermore, the coating or the method for using the coating according to the present invention is used.

[0022] The coating technology adopted in this solution significantly improves the surface grinding efficiency, reduces tool loss, and greatly saves working hours after coating the steel ingot.

[0023] Specifically, the beneficial effects are as follows:

[0024] 1. The material loss rate of the steel ingots without coating protection when grinding to bright finish is 13-17%, while the material loss rate of the steel ingots with coating protection is reduced to 3-6%.

[0025] 2. In terms of labor time saving, the proportion of labor time saved by steel ingot processing using coating technology is as high as 54%-83%.

[0026] 3. In terms of tool loss, the number of tool heads used for processing each ingot unit was reduced by 1-2.

[0027] 4. The steel ingots are all surface-grinded. The steel ingots that are directly subjected to homogenization heat treatment without coating protection are forged into 70mm thick slabs, and the length of the edge cracks is 3-15mm. The steel ingots that are protected by anti-oxidation coating during the homogenization heat treatment are forged into 70mm thick slabs, and the length of the edge cracks is <5mm.

[0028] 5. For steel ingots of the same size under the same processing technology, steel ingots protected by anti-oxidation coating during homogenization heat treatment can produce finished products with larger width.

[0029] 6. The coating composition proposed by the present invention eliminates the more common chromium element, thereby avoiding the environmental pollution caused by the homogenization process to the greatest extent.

[0030] 7. The coating proposed by the present invention is applicable to most nickel-based high-temperature alloys, has a wide applicable temperature range and a high upper limit.

[0031] In summary, this solution uses specific coatings and corresponding methods of use to allow high-temperature alloys to withstand longer homogenization heat treatment time while ensuring surface quality, which can effectively reduce the erosion and oxidation of the surface of the steel ingot by high-temperature furnace gas, and reduce subcutaneous oxidation cracks and element depletion. On the one hand, it reduces the risk of cracking during hot processing, and on the other hand, effectively reduces the amount of grinding, which can save labor hours and improve the comprehensive yield rate, effectively saving production costs while improving the economic benefits of the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0033] Figure 1 The figure shows the degree of oxidation on the edge and surface of the steel ingot after being coated with the coating of the present invention and undergoing heat treatment and forging process;

[0034] Figure 2 The figure shows the degree of oxidation on the edge and surface of a steel ingot which is not coated with the coating of the present invention after heat treatment and forging process. DETAILED DESCRIPTION

[0035] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present invention can be combined with each other. The present invention will be described in detail below in conjunction with the embodiments.

[0036] The present invention is further described in detail below in conjunction with specific embodiments. These embodiments should not be construed as limiting the scope of protection claimed by the present invention.

[0037] The coating according to the present invention comprises a solute and a solvent. The exemplary contents of the solute components of the coating in the following Examples 1-9 are shown in Table 1.

[0038] Table 1 Components of six-component mixed coating solutes (by mass percentage)

[0039]

[0040] Example 1

[0041] This embodiment provides a six-component high temperature oxidation resistant coating, the solute includes

[0042] Al2O3+SiO2+Fe3O4+SiC+Y2O3+ZrO2. In terms of mass percentage, Al2O3: 33%, SiO2: 42%, Fe3O4: 10%, SiC: 8%, Y2O3+ZrO2: 7% (of which Y2O3 / (Y2O3+ZrO2) is 6%, and the balance is ZrO2). Among them, Al2O3 and SiO2 are the main materials.

[0043] Example 2

[0044] This embodiment provides a six-component high temperature oxidation resistant coating, the solute includes

[0045] Al2O3+SiO2+Fe3O4+SiC+Y2O3+ZrO2. In terms of mass percentage, Al2O3: 35%, SiO2: 43%, Fe3O4: 14%, SiC: 3%, Y2O3+ZrO2: 5% (of which Y2O3 / (Y2O3+ZrO2) is 9%, and the balance is ZrO2). Al2O3 and SiO2 are the main materials.

[0046] Example 3

[0047] This embodiment provides a six-component high temperature oxidation resistant coating, the solute includes

[0048] Al2O3+SiO2+Fe3O4+SiC+Y2O3+ZrO2. In terms of mass, Al2O3: 35%, SiO2: 45%, Fe3O4: 8%, SiC: 5.5%, Y2O3+ZrO2: 6.5% (of which Y2O3 / (Y2O3+ZrO2) is 7%, and the balance is ZrO2). Al2O3 and SiO2 are the main materials.

[0049] Example 4

[0050] This embodiment provides a six-component high temperature oxidation resistant coating, the solute includes

[0051] Al2O3+SiO2+Fe3O4+SiC+Y2O3+ZrO2. By mass, Al2O3: 40%, SiO2: 42%, Fe3O4: 9%, SiC: 4%, Y2O3+ZrO2: 5% (of which Y2O3 / (Y2O3+ZrO2) is 5%, and the balance is ZrO2). Al2O3 and SiO2 are the main materials.

[0052] Example 5

[0053] This embodiment provides a six-component high temperature oxidation resistant coating, the solute includes

[0054] Al2O3+SiO2+Fe3O4+SiC+Y2O3+ZrO2. By mass, Al2O3: 33%, SiO2: 49%, Fe3O4: 9%, SiC: 4%, Y2O3+ZrO2: 5% (of which Y2O3 / (Y2O3+ZrO2) is 8%, and the balance is ZrO2). Al2O3 and SiO2 are the main materials.

[0055] Example 6

[0056] This embodiment provides a six-component high temperature oxidation resistant coating, the solute includes

[0057] Al2O3+SiO2+Fe3O4+SiC+Y2O3+ZrO2. In terms of mass, Al2O3: 35%, SiO2: 43%, Fe3O4: 9.5%, SiC: 7%, Y2O3+ZrO2: 5.5% (of which Y2O3 / (Y2O3+ZrO2) is 8.5%, and the balance is ZrO2). Al2O3 and SiO2 are the main materials.

[0058] Example 7

[0059] This embodiment provides a six-component high temperature oxidation resistant coating, the solute includes

[0060] Al2O3+SiO2+Fe3O4+SiC+Y2O3+ZrO2. By mass, Al2O3: 34%, SiO2: 46%, Fe3O4: 11%, SiC: 4%, Y2O3+ZrO2: 5% (of which Y2O3 / (Y2O3+ZrO2) is 9%, and the balance is ZrO2). Al2O3 and SiO2 are the main materials.

[0061] Example 8

[0062] This embodiment provides a six-component high temperature oxidation resistant coating, the solute includes

[0063] Al2O3+SiO2+Fe3O4+SiC+Y2O3+ZrO2. By mass, Al2O3: 36%, SiO2: 43%, Fe3O4: 10%, SiC: 6%, Y2O3+ZrO2: 5% (of which Y2O3 / (Y2O3+ZrO2) is 9%, and the balance is ZrO2). Al2O3 and SiO2 are the main materials.

[0064] Example 9

[0065] This embodiment provides a six-component high temperature oxidation resistant coating, the solute includes

[0066] Al2O3+SiO2+Fe3O4+SiC+Y2O3+ZrO2. In terms of mass, Al2O3: 35%, SiO2: 42.5%, Fe3O4: 10%, SiC: 7.5%, Y2O3+ZrO2: 5% (of which Y2O3 / (Y2O3+ZrO2) is 8%, and the balance is ZrO2). Al2O3 and SiO2 are the main materials.

[0067] The method for using the high temperature oxidation resistant coating having the components of the above embodiment comprises the following specific steps:

[0068] S1 mixing: the solute having the above components is fully mixed with a solvent, i.e., distilled water at 46° C., in a certain ratio, wherein the total volume of the added coating solute and the volume ratio of the solvent distilled water are 1:2.1;

[0069] S2 coating: uniformly coating the fully mixed coating on the surface of the steel ingot to be heat treated;

[0070] S3 pretreatment: further includes baking and coating protection steps.

[0071] S3-1 Baking:

[0072] The coated steel ingot is loaded into a trolley heat treatment furnace with a baking temperature of 180°C and a baking time of 45 minutes.

[0073] S3-2 coating protection:

[0074] After the baked steel ingot is taken out from the trolley heat treatment furnace, it is fully wrapped with a steel strip with a thickness of 0.1 mm and a width of 350 mm.

[0075] In other embodiments, in the S1 mixing step, the temperature of the distilled water may be 60°C.

[0076] In a preferred embodiment, in the S1 mixing step, the temperature of the distilled water may be 48°C.

[0077] In other embodiments, in the S1 mixing step, the ratio of the total volume of the added coating solute to the volume of the solvent distilled water is 1:2.3.

[0078] In other embodiments, in the S1 mixing step, the ratio of the total volume of the added coating solute to the volume of the solvent distilled water is 1:1.8.

[0079] In other embodiments, the baking temperature may be 250° C., and the baking time may be 30 minutes.

[0080] In a preferred embodiment, the baking temperature may be 215° C. and the baking time may be 40 minutes.

[0081] In the present method, if the baking temperature is too high and the baking time is too long, the oxide coating will be over-dried. On the one hand, cracks will be generated, affecting the protective effect of the coating. On the other hand, it will not be able to effectively adhere to the surface of the steel ingot and will fall off due to the high temperature during the homogenization process, further weakening the protective effect of the coating. If the baking temperature is too low and the baking time is too short, the coating cannot be effectively solidified. During the transportation of the steel ingot, the coating will flow or drip under the action of gravity, which is not conducive to production and processing, and also leads to uneven coating thickness. During the homogenization heat treatment process, the protective effect of different positions of the steel ingot is not uniform, increasing the risk of instability in the subsequent forging process.

[0082] In other embodiments, the steel strip wrapping the steel ingot has a width of 0.25 mm and a width of 150 mm.

[0083] In a preferred embodiment, the steel strip wrapping the steel ingot has a width of 0.2 mm and a width of 260 mm.

[0084] In this method, the width and thickness of the steel strip used to wrap the steel ingot should be selected according to the actual weight and diameter of the steel ingot. If the steel strip is too thin, it will be damaged during the transportation and placement of the steel ingot, increasing the risk of coating falling off. At the same time, the coating falling off in the heat treatment furnace will affect the heating effect of the furnace wire; when the steel ingot is too narrow, it will be more difficult to fully wrap the steel ingot.

[0085] Reference Figure 1 , the pre-treated steel ingot is subjected to homogenization heat treatment, and the effect parameters of Examples 1-9 obtained are as follows:

[0086]

[0087] The comparative examples are further supplemented to further illustrate the technical effects of high-temperature anti-oxidation brought about by the coating and the method of use involved in the scheme.

[0088] After changing the distribution ratio of each component of the coating solute, but not changing the volume ratio of the coating solute and solvent water, the following results were obtained using the same preparation process:

[0089]

[0090] Comparative Examples 1-4 are methods for using high temperature oxidation resistant coatings, and the specific steps are as follows:

[0091] In Comparative Examples 1-4, the baking temperature is 210° C., the baking time is 38 min, and the selected steel strip has a thickness of 0.20 mm and a width of 270 mm.

[0092] Using the coatings of Comparative Examples 1-4 and the corresponding methods of use, the parameters of the homogenization effect of the steel ingot are as follows:

[0093]

[0094] Combination Figure 1-2 It can be seen from the various embodiments and comparative examples that the coating of the present invention has a very good protective effect on the steel ingot during the homogenization process.

[0095] In Comparative Example 2, the content of Fe3O4 component was reduced to 7%, and the cracking degree of the forging edge of the steel ingot, the surface quality of the coating and the grinding loss of the steel ingot were all significantly negatively affected.

[0096] In addition, it can be seen from the results of Comparative Example 3 that the effect of reducing the component Y2O3 in the six-component mixed coating on the coating effect is slightly smaller than the effect caused by the parameter changes in Comparative Example 2. Although the coating surface after heat treatment can still maintain its intact morphology after reducing Y2O3, the negative impact of the lack of this component on the cracking degree and grinding loss of the forged edge of the steel ingot is still very obvious.

[0097] In Comparative Example 1, the three components of SiO2, Fe3O4 and SiC are not within the range defined by the present invention. Compared with Comparative Examples 2 and 3, the degree of cracking of the forging edge of the steel ingot after heat treatment, the surface quality of the coating and the grinding loss of the steel ingot all have certain negative effects.

[0098] The present invention achieves excellent anti-oxidation performance for coated steel ingots (especially nickel-based high-temperature alloys) by precisely controlling the proportion of each component in the mixed coating and using a technology designed specifically for the coating, thereby demonstrating its significant technical advantages. This solution not only improves the protective effect of the coating, but also ensures the stability and durability of the coating in a high-temperature environment, providing a more reliable protection solution for the application of high-temperature alloys.

[0099] Taking nickel-based high-temperature alloy GH4169 as an example, a coating is prepared using the coating ratios in Examples 10-12 and Comparative Examples 5 and 6, and then coated on the surface of GH4169 steel ingot and subjected to a specific homogenization treatment:

[0100] Table 2 Coating composition and homogenization conditions

[0101]

[0102] It is known that, when the mass fractions of the components of the coating remain unchanged, changing the volume ratio of the coating solute and the solvent will result in coatings of different concentrations.

[0103] Examples 10-12 use the optimal volume ratio of solute and solvent defined in the invention to prepare the coating. The coating is applied to the surface of the above GH4169 steel ingot, and the steel ingot is subjected to homogenization heat treatment according to the system of 1160°C×24h+1180°C×24h.

[0104] Comparative Examples 5 and 6 use a ratio of solute to solvent outside the optimal volume ratio range defined in the invention to prepare the coating. The surfaces of the above GH4169 steel ingots are coated with the coatings of Comparative Examples 5-6 respectively.

[0105] Under the experimental conditions of not changing the coating application method and the homogenization system, the effect parameters of Examples 10-12 and Comparative Examples 5-6 are as follows:

[0106]

[0107] It can be seen that after adopting the coating solute component in the technical solution of the present invention, the ratio of the coating solute to the solvent has little effect on the final anti-high temperature oxidation effect, which further illustrates the effectiveness of this component.

[0108] It should be noted that the high temperature oxidation resistant coating and the method for using the coating are also applicable to the pretreatment of other types of nickel-based high temperature alloys under the homogenization system conditions of 700-1250°C and no more than 80 hours. According to experiments, the limit temperature of the homogenization treatment of the steel ingot coated with the coating of the present invention and subjected to the same treatment steps can reach 1300°C, and the general use temperature is 1250°C.

[0109] To further illustrate the technical effect of the solution of the present invention, the functions of the components of the anti-oxidation coating that can be applied to the heat treatment of high-temperature alloys are as follows:

[0110] The main materials of the coating powder are SiO2 and Al2O3. Among them, Al2O3 can form a stable oxide film at high temperature to provide further oxidation protection. SiO2 can be combined with other components to improve the anti-oxidation effect and mechanical strength of the coating. Both oxides have high melting points and good thermal stability, can maintain structural stability in high temperature environments, are not easy to decompose or melt, and enhance the protective performance of the coating at high temperatures. In the present invention, the two substances begin to soften and melt at around 780°C to form a low-melting-point vitreous film that is evenly and firmly attached to the surface of the steel ingot.

[0111] Adding SiC can better consume the O2 in the furnace. During the homogenization process, when the O2 in the high-temperature furnace gas diffuses through the coating, it will react with SiC, that is, SiC+O2=SiO2+CO2. As the temperature in the furnace rises, SiO2 gradually melts into a dense silicon-oxygen tetrahedral structure, effectively preventing the high-temperature furnace gas from contacting the steel ingot matrix.

[0112] (Y2O3+ZrO2) is yttria-stabilized zirconia (YSZ), which is widely used in thermal barrier coatings because of its outstanding corrosion resistance and mechanical strength, and its significant anti-oxidation and reduction ability in high temperature environments. The use of YSZ coating has significantly improved the upper limit of the process temperature while maintaining excellent thermal shock resistance. Specifically, the addition of Y2O3 is mainly used to stabilize the structure of ZrO2, because ZrO2 will undergo phase changes during the heating and cooling process, resulting in volume changes, which may cause cracking of the coating and reduce its protective effect. The addition of 5-9% Y2O3 can effectively stabilize ZrO2 and reduce the volume changes caused by phase changes, thereby improving the thermal cycle life and thermal shock resistance of the coating.

[0113] The addition of Fe3O4 is intended to melt under high temperature conditions to form an inert protective film, thereby providing an additional anti-oxidation barrier. This protective film can reduce the penetration of oxygen and other corrosive gases, and play a role in isolating and slowing down the oxidation of the underlying material. When Fe3O4 and (Y2O3+ZrO2) work together, Fe3O4 further enhances the overall antioxidant capacity of the coating. Specifically, Fe3O4 can be transformed into a dense oxide film under high temperature conditions, which is closely bonded to the surface of the underlying material, improving the durability and corrosion resistance of the coating in high temperature and harsh environments. At the same time, this protective film has good stability during temperature fluctuations, and cooperates with Y2O3 and ZrO2 to provide a comprehensive thermal protection effect. Therefore, Y2O3 stabilizes the ZrO2 structure to avoid volume changes and cracking caused by phase changes, while Fe3O4 adds multiple protective layers to the coating.

[0114] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0115] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A high temperature oxidation resistant coating, comprising a solvent and a solute, characterized in that: In terms of mass percentage, the solute includes Al2O3: 33-40%, SiO2: 42-49%, Fe3O4: 8-14%, SiC: 3-8%, 5-7% (Y2O3+ZrO2), wherein the proportion of Y2O3 in (Y2O3+ZrO2) is 5-9%.

2. A high temperature oxidation resistant coating as claimed in claim 1, characterized in that: The solute includes Al2O3: 34%-36%, SiO2: 42%-45%, Fe3O4: 9%-10%, SiC: 6-7.5%, 5.5-6.5% (Y2O3+ZrO2), wherein the proportion of Y2O3 in (Y2O3+ZrO2) is 7-8.5%.

3. A high temperature oxidation resistant coating as claimed in claim 2, characterized in that: The solvent is water.

4. A high temperature oxidation resistant coating as claimed in claim 3, characterized in that: The volume ratio of the solute to the solvent is 1:1.8-2.

3.

5. A method for using a high temperature oxidation resistant coating, characterized in that: include: A solute is prepared with the following chemical components, which contain, by mass percentage, Al2O3: 33-40%, SiO2: 42-49%, Fe3O4: 8-14%, SiC: 3-8%, 5-7% (Y2O3+ZrO2), wherein the proportion of Y2O3 in (Y2O3+ZrO2) is 5-9%; Mixing the solute with water at 46-60° C. to obtain the coating; The coating is applied on the surface of the steel ingot to be treated.

6. A method for using the high temperature oxidation resistant coating as claimed in claim 5, characterized in that: The process of pre-treating the steel ingot comprises: heating and baking the steel ingot coated with the coating, the baking temperature is 180-250° C., and the baking time is 30-45 minutes.

7. A method for using the high temperature oxidation resistant coating as claimed in claim 6, characterized in that: The process of pre-treating the steel ingot includes: wrapping the baked steel ingot with a steel belt.

8. A method for using the high temperature oxidation resistant coating as claimed in claim 7, characterized in that: The steel strip has a thickness of 0.1-0.25 mm and a width of 150-350 mm.

9. A method for using the high temperature oxidation resistant coating as claimed in claim 8, characterized in that: The volume ratio of the solute to water is 1:1.8-2.

3.

10. Application of a high temperature oxidation resistant coating before homogenization of a high temperature alloy, characterized in that: The coating material according to claim 1 or the method of use according to claim 5 is used.

Images