A ternary anti-oxidation coating for annealing of welding material of Al and Ti containing high-temperature alloy, and a preparation method and application thereof

Abstract

This invention proposes a ternary anti-oxidation coating for annealing high-temperature alloy welding materials containing Al and Ti elements, its preparation method, and its application. The ternary anti-oxidation coating comprises SiC, Al2O3, and B2O3 in a mass ratio of (1.5–2.5):(2.8–3.5):1. By using a composite of SiC, Al2O3, and B2O3 as an anti-oxidation coating, this invention can form a dense glassy glaze layer on the surface of high-temperature alloys under high-temperature heat treatment without a protective atmosphere. This prevents surface oxidation and internal oxide layers from forming on the high-temperature alloys during annealing heat treatment, resulting in high-quality high-temperature alloy welding materials, improved welding efficiency, and higher quality welded structural components, thus possessing significant economic value.

Description

Technical Field

[0001] This invention belongs to the field of welding material manufacturing technology. Specifically, this invention relates to a ternary anti-oxidation coating for annealing high-temperature alloy welding materials containing Al and Ti elements, its preparation method, and its application. Background Technology

[0002] Welding, as an independent discipline, has been widely applied in industries such as aerospace, nuclear power, automobiles, and machinery manufacturing, playing a vital role in national economic development. Welding is inseparable from welding materials; for structural components that require welding, welding and welding materials act as the "needle and thread." For some heat-sensitive and load-bearing components of aero-engines and gas turbines, such as the combustion chamber's flame tube, casing, afterburner heat shield, support plates, and tail nozzle adjustment plates, welding technology is required to connect them into a unified whole.

[0003] Welding consumables, as an indispensable part of the welding process, are generally used for welding hot-end components operating in high-temperature environments. To determine whether a particular high-temperature alloy is weldable, its weldability must be analyzed and studied. A welding consumable is considered to have good weldability if the welding process is simple and the weld joint performance is good. Besides the influence of the composition of the high-temperature alloy welding consumable itself, the quality of the consumable, especially the content of surface oxygen and nitrogen gas elements, plays a crucial role in the welding process and the quality of the weld joint. Therefore, during the preparation of welding consumables, the content of oxygen and nitrogen gas should be minimized as much as possible to avoid the formation of oxides and nitrides during welding, thereby reducing the tendency for porosity and cracks in the joint structure and maintaining the strength, plasticity, and toughness of the weld joint to meet the requirements of the service environment.

[0004] Typically, the manufacturing process for high-temperature alloy welding materials is as follows: smelting → forging → hot rolling → annealing heat treatment → cold drawing → annealing heat treatment → ... → cold drawing → annealing heat treatment → light drawing of finished welding materials. After hot rolling, a relatively coarse intermediate billet with a diameter of 8mm to 10mm is obtained. This coarse intermediate billet undergoes annealing heat treatment in an unprotected atmosphere followed by cold drawing and other processes. However, because the intermediate billet is relatively coarse (diameter ≥ Φ5mm to 6mm), continuous annealing heat treatment in a protective atmosphere is not feasible. Therefore, annealing heat treatment needs to be performed in an unprotected atmosphere. The annealing heat treatment temperature for high-temperature alloys is relatively high (around 20℃ above and below the γ′ phase remelting temperature, i.e., the solution heat treatment temperature is between 1000℃ and 1200℃), which easily leads to the formation of an oxide layer on the surface. Especially for high-temperature alloys containing Al and Ti, an internal oxide layer will also form, which is quite deep, sometimes reaching 1mm to 2mm. This oxide layer is extremely difficult to completely remove during subsequent processing and may even deepen during subsequent intermediate heat treatments. Furthermore, during the drawing process, lubricating oil and lubricating powder can embed into the oxide layer, thereby increasing the content of gaseous elements such as O and N in the finished welding material to exceed the standard, which seriously affects the welding performance of the welding material. Summary of the Invention

[0005] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, embodiments of this invention propose a ternary anti-oxidation coating for annealing high-temperature alloy welding materials containing Al and Ti elements, its preparation method, and its application.

[0006] In a first aspect, embodiments of the present invention provide a ternary anti-oxidation coating for annealing high-temperature alloy welding materials containing Al and Ti elements. The components of the ternary anti-oxidation coating include SiC, Al2O3 and B2O3, with a mass ratio of (1.5-2.5):(2.8-3.5):1.

[0007] This invention uses a composite of SiC, Al2O3, and B2O3 as an anti-oxidation coating. This coating can form a dense glass glaze layer on the surface of high-temperature alloys under high-temperature heat treatment without a protective atmosphere. This prevents the reaction of oxygen, nitrogen, and other gaseous elements in the air with the high-temperature alloys and prevents the formation of surface oxidation and internal oxide layers in the high-temperature alloy welding materials during annealing heat treatment. As a result, high-quality high-temperature alloy welding materials can be produced, improving welding efficiency and the quality of welded structural components, which plays a vital role in promoting the development of the national economy.

[0008] Furthermore, the preferred mass ratio of SiC, Al2O3, and B2O3 is 2:3:1.

[0009] Secondly, embodiments of the present invention also propose a method for preparing the ternary anti-oxidation coating as described in the first aspect, comprising the following steps: mixing SiC, Al2O3 and B2O3 uniformly in a certain proportion to obtain the ternary anti-oxidation coating.

[0010] The features and advantages described above for ternary anti-oxidation coatings used in the annealing of high-temperature alloy welding materials containing Al and Ti elements also apply to the preparation method of ternary anti-oxidation coatings, and will not be repeated here.

[0011] Thirdly, embodiments of the present invention also propose the application of the ternary anti-oxidation coating as described in the first aspect in the preparation of high-temperature alloy welding materials containing Al and Ti elements, including the following steps:

[0012] (1) Add the ternary anti-oxidation coating to water to obtain an anti-oxidation slurry;

[0013] (2) The high-temperature alloy billet containing Al and Ti elements is immersed in the anti-oxidation slurry, and then the high-temperature alloy billet containing Al and Ti elements coated with the anti-oxidation slurry is baked to obtain a high-temperature alloy billet containing Al and Ti elements coated with an anti-oxidation coating.

[0014] (3) The high-temperature alloy billet containing Al and Ti elements coated with an anti-oxidation coating is subjected to annealing heat treatment and then rapidly water-cooled to obtain high-temperature alloy welding material containing Al and Ti elements.

[0015] This invention, by coating the surface of high-temperature alloy billets containing Al and Ti elements with an anti-oxidation coating, can prevent the formation of surface oxidation and internal oxide layers during annealing heat treatment, thereby enabling the preparation of high-quality high-temperature alloy welding materials, improving welding efficiency and the quality of welded structural components, and possessing high economic value. Furthermore, this method is simple to implement, has low technical difficulty, is easy to operate, and uses inexpensive raw materials, making it suitable for industrial applications.

[0016] In some embodiments, the Al and Ti-containing high-temperature alloy billet is obtained by sequentially melting, forging, and hot rolling the components of the Al and Ti-containing high-temperature alloy.

[0017] In some embodiments, the mass ratio of the high-temperature alloy billet containing Al and Ti elements to the ternary anti-oxidation coating in the anti-oxidation slurry is 1:(0.5 to 1.5).

[0018] In some embodiments, the soaking time is 5 min to 20 min.

[0019] In some embodiments, the baking temperature is 100℃~500℃ and the baking time is 2h~6h.

[0020] In some embodiments, the thickness of the anti-oxidation coating is 1 mm to 5 mm.

[0021] In some embodiments, during the annealing heat treatment, the furnace loading temperature is 400℃~800℃, and the annealing time is 0.5h~2.5h. Attached Figure Description

[0022] Figure 1 This is a cross-sectional microstructure of the high-temperature alloy welding material containing Al and Ti elements prepared in Example 1 of the present invention.

[0023] Figure 2 This is a cross-sectional microstructure of the high-temperature alloy welding material containing Al and Ti elements prepared in Example 2 of the present invention.

[0024] Figure 3 This is a cross-sectional microstructure of the high-temperature alloy welding material containing Al and Ti elements prepared in Example 3 of the present invention.

[0025] Figure 4 This is a cross-sectional microstructure of the high-temperature alloy welding material containing Al and Ti elements prepared in Example 4 of the present invention.

[0026] Figure 5 The image shows the cross-sectional microstructure of the high-temperature alloy welding material containing Al and Ti elements prepared in Comparative Example 1.

[0027] Figure 6 The image shows the cross-sectional microstructure of the high-temperature alloy welding material containing Al and Ti elements prepared in Comparative Example 2. Detailed Implementation

[0028] The embodiments of the present invention are described in detail below. These embodiments are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0029] In this document, when values ​​are described as ranges, it should be understood that such disclosure includes disclosure of all possible subranges within that range, as well as the specific numerical values ​​falling within that range, regardless of whether the specific numerical value or specific subrange is explicitly specified.

[0030] In this article, the words “contain” and “include” and their various variations mean that other elements or wholes may be included but not specifically described.

[0031] This invention addresses the requirement that the viscosity, surface tension, and coefficient of thermal expansion of the glass phase generated by the anti-oxidation coating must be compatible with the substrate to avoid cracking, peeling, and other phenomena caused by performance mismatch, leading to anti-oxidation failure. Furthermore, considering the presence of Al and Ti elements in high-temperature alloys, this invention proposes a ternary anti-oxidation coating suitable for use in the annealing heat treatment of Al and Ti-containing high-temperature alloy welding materials. Specifically:

[0032] In a first aspect, embodiments of the present invention provide a ternary anti-oxidation coating for annealing high-temperature alloy welding materials containing Al and Ti elements. The components of the ternary anti-oxidation coating include SiC, Al2O3 and B2O3, with a mass ratio of (1.5-2.5):(2.8-3.5):1.

[0033] By using a composite of SiC, Al2O3, and B2O3 as an anti-oxidation coating, SiC reacts with oxygen during high-temperature heat treatment (i.e., SiC + 3 / 2O2 → SiO2 + CO) to form a SiO2 film on the surface of high-temperature alloys containing Al and Ti elements, thus preventing oxygen from entering and reacting with the high-temperature alloy to form an oxide layer. The addition of Al2O3 can form a dense anti-oxidation layer on the surface of the high-temperature alloy in the early stage of annealing heat treatment, preventing oxygen from entering. In addition, a small amount of B2O3 is added to the anti-oxidation coating to replace SiO2, thereby lowering the melting temperature of the anti-oxidation coating glaze and making the anti-oxidation coating easier to remove during subsequent cooling.

[0034] Furthermore, the preferred mass ratio of SiC, Al2O3, and B2O3 is 2:3:1.

[0035] Secondly, embodiments of the present invention also propose a method for preparing the ternary anti-oxidation coating as described in the first aspect, comprising the following steps: mixing SiC, Al2O3 and B2O3 uniformly in a certain proportion to obtain the ternary anti-oxidation coating.

[0036] Thirdly, embodiments of the present invention also propose the application of the ternary anti-oxidation coating as described in the first aspect in the preparation of high-temperature alloy welding materials containing Al and Ti elements, including the following steps:

[0037] (1) Add the ternary anti-oxidation coating to water to obtain an anti-oxidation slurry;

[0038] (2) The high-temperature alloy billet containing Al and Ti elements is immersed in the anti-oxidation slurry, and then the high-temperature alloy billet containing Al and Ti elements coated with the anti-oxidation slurry is baked to obtain a high-temperature alloy billet containing Al and Ti elements coated with an anti-oxidation coating.

[0039] (3) The high-temperature alloy billet containing Al and Ti elements coated with an anti-oxidation coating is subjected to annealing heat treatment and then rapidly water-cooled to obtain high-temperature alloy welding material containing Al and Ti elements.

[0040] In some embodiments, the Al and Ti-containing high-temperature alloy billet is obtained by sequentially melting, forging, and hot rolling the components of the Al and Ti-containing high-temperature alloy. It should be noted that the Al and Ti-containing high-temperature alloy billet in this application is not particularly limited, as long as the alloy composition contains Al and Ti elements. Those skilled in the art can select according to actual needs, such as GH4145 alloy, GH4169 alloy, etc.; and the control of process parameters during the preparation of the alloy billet can refer to conventional operations and conditions in the art.

[0041] In some embodiments, the mass ratio of the Al and Ti-containing high-temperature alloy billet to the ternary anti-oxidation coating in the anti-oxidation slurry is 1:(0.5 to 1.5), for example, it can be 1:0.5, 1:0.8, 1:1, 1:1.2, or 1:1.5, but it is not limited to the listed values; other unlisted values ​​within this range are also applicable. If the mass ratio of the ternary anti-oxidation coating is too low, oxygen in the air will continue to react with the alloy matrix to produce oxides; however, if the mass ratio of the ternary anti-oxidation coating is too high, it will cause unnecessary waste. Therefore, this application controls the mass ratio of the Al and Ti-containing high-temperature alloy billet to the ternary anti-oxidation coating to be 1:(0.5 to 1.5).

[0042] In some embodiments, the soaking time is 5 min to 20 min, for example, 5 min, 8 min, 10 min, 12 min, 15 min, 18 min, or 20 min, but is not limited to the listed values; other unlisted values ​​within this range are also applicable. If the soaking time is too long, the anti-oxidation coating is prone to clumping; however, if the soaking time is too short, the anti-oxidation coating will not adhere evenly to the welding material substrate (i.e., alloy). Therefore, this application controls the soaking time to 5 min to 20 min.

[0043] In some embodiments, the baking temperature is 100℃ to 500℃, for example, 100℃, 150℃, 200℃, 260℃, 300℃, 320℃, 400℃, 450℃, or 500℃, but not limited to the listed values; other unlisted values ​​within this range are also applicable. The baking time is 2h to 6h, for example, 2h, 2.5h, 3h, 4h, 4.5h, 5h, or 6h, but not limited to the listed values; other unlisted values ​​within this range are also applicable. By baking the Al and Ti-containing high-temperature alloy billet coated with an anti-oxidation slurry, the anti-oxidation coating can be evenly spread on the surface of the Al and Ti-containing high-temperature alloy billet, thereby achieving a better anti-oxidation effect. If the baking temperature is too high, the moisture in the anti-oxidation slurry will evaporate excessively, which will cause the anti-oxidation coating to become brittle and easily crack and peel off; however, if the baking temperature is too low, it will be difficult to form a dense protective layer on the surface of the alloy substrate, and it will not be able to isolate the air. Therefore, this application controls the baking temperature to 100℃~500℃.

[0044] In some embodiments, the thickness of the anti-oxidation coating is 1 mm to 5 mm, for example, it can be 1 mm, 2 mm, 3 mm or 5 mm, but it is not limited to the listed values. Other unlisted values ​​within this range are also applicable.

[0045] In some embodiments, during the annealing heat treatment, the furnace loading temperature is 400℃ to 800℃, for example, 400℃, 480℃, 500℃, 520℃, 600℃, 750℃, or 800℃, but not limited to the listed values; other unlisted values ​​within this range also apply. The annealing time is 0.5h to 2.5h, for example, 0.5h, 0.8h, 1h, 1.5h, 2h, or 2.5h, but not limited to the listed values; other unlisted values ​​within this range also apply. During the annealing heat treatment, by controlling the furnace loading temperature below 800℃, rapid heating can prevent the anti-oxidation coating from cracking and detaching, thus reducing its anti-oxidation effect.

[0046] Furthermore, in this application, the high-temperature alloy billet containing Al and Ti elements coated with an anti-oxidation coating is rapidly cooled by water cooling after annealing heat treatment. On the one hand, this avoids the precipitation of the second phase in the alloy during slow cooling, which would increase the alloy strength and make subsequent processing more difficult. On the other hand, during the water cooling process, due to the difference in the coefficient of thermal expansion between the anti-oxidation coating and the alloy, the anti-oxidation coating can be automatically detached and removed.

[0047] The following are non-limiting embodiments and comparative examples of the present invention. It should be noted that the schemes in the comparative examples are not prior art, but are only set up for comparison with the schemes in the embodiments, and are not intended to limit the present invention. Unless otherwise stated, all raw materials used in the embodiments and comparative examples are conventional commercially available products, or can be prepared by known methods; and the experimental methods in the embodiments and comparative examples that do not specify specific conditions are conventional methods and conditions well known in the art.

[0048] Example 1

[0049] The application of the ternary anti-oxidation coating in the preparation of high-temperature alloy welding materials containing Al and Ti elements in this embodiment includes the following steps:

[0050] (1) The components of GH4145 alloy (Al+Ti>2.0wt.%, specific composition is shown in Table 1) were melted, forged and hot rolled in sequence to obtain 200kg of GH4145 high temperature alloy billet with a specification of Φ8mm.

[0051] (2) Add 66.67 kg SiC, 100 kg Al2O3 and 33.33 kg B2O3 (i.e., the mass ratio of SiC, Al2O3 and B2O3 is 2:3:1) to an appropriate amount of water and melt them into a paste to obtain an anti-oxidation slurry;

[0052] (3) Immerse the GH4145 high-temperature alloy billet obtained in step (1) in the anti-oxidation slurry prepared in step (2) so that the GH4145 high-temperature alloy billet is uniformly coated with the anti-oxidation slurry. After immersion for 8 minutes, place the GH4145 high-temperature alloy billet coated with the anti-oxidation slurry in a baking oven and bake at 300°C for 4 hours so that the anti-oxidation slurry is evenly spread on the surface of the GH4145 high-temperature alloy billet, and obtain a GH4145 high-temperature alloy billet coated with a 3mm thick anti-oxidation coating.

[0053] (4) Place the GH4145 high-temperature alloy billet coated with anti-oxidation coating into a heat treatment furnace for annealing heat treatment. The furnace loading temperature is 500℃, and the annealing is carried out at 1050℃ for 1 hour. Finally, the annealed material is taken out from the annealing furnace and quickly transferred to a water cooling pool for water cooling to obtain high-temperature alloy welding material containing Al and Ti elements.

[0054] Table 1. Chemical composition of GH4145 alloy (wt.%)

[0055]

[0056] Example 2

[0057] The application of the ternary anti-oxidation coating in the preparation of high-temperature alloy welding materials containing Al and Ti elements in this embodiment includes the following steps:

[0058] (1) The components of GH4145 alloy (specific components are the same as those in Table 1 of Example 1) are melted, forged and hot rolled in sequence to obtain 200 kg of GH4145 high temperature alloy billet with a specification of Φ10 mm.

[0059] (2) Add 66.67 kg SiC, 100 kg Al2O3 and 33.33 kg B2O3 (i.e., the mass ratio of SiC, Al2O3 and B2O3 is 2:3:1) to an appropriate amount of water and melt them into a paste to obtain an anti-oxidation slurry;

[0060] (3) Immerse the GH4145 high-temperature alloy billet obtained in step (1) in the anti-oxidation slurry prepared in step (2) so that the GH4145 high-temperature alloy billet is uniformly coated with the anti-oxidation slurry. After immersion for 15 minutes, place the GH4145 high-temperature alloy billet coated with the anti-oxidation slurry in a baking oven and bake at 400°C for 2 hours so that the anti-oxidation slurry is evenly spread on the surface of the GH4145 high-temperature alloy billet, and obtain a GH4145 high-temperature alloy billet coated with a 4mm thick anti-oxidation coating.

[0061] (4) Place the GH4145 high-temperature alloy billet coated with anti-oxidation coating into a heat treatment furnace for annealing heat treatment. The furnace loading temperature is 600℃, and the annealing is carried out at 1050℃ for 1 hour. Finally, the annealed material is taken out from the annealing furnace and quickly transferred to a water cooling pool for water cooling to obtain high-temperature alloy welding material containing Al and Ti elements.

[0062] Example 3

[0063] The application of the ternary anti-oxidation coating in the preparation of high-temperature alloy welding materials containing Al and Ti elements in this embodiment includes the following steps:

[0064] (1) The components of GH4145 alloy (specific components are the same as those in Table 1 of Example 1) are melted, forged and hot rolled in sequence to obtain 200 kg of GH4145 high temperature alloy billet with a specification of Φ10 mm.

[0065] (2) Add 42.50 kg SiC, 79.30 kg Al2O3 and 28.30 kg B2O3 (i.e., the mass ratio of SiC, Al2O3 and B2O3 is 1.5:2.8:1) to an appropriate amount of water and melt them into a paste to obtain an anti-oxidation slurry;

[0066] (3) Immerse the GH4145 high-temperature alloy billet obtained in step (1) in the anti-oxidation slurry prepared in step (2) so that the GH4145 high-temperature alloy billet is uniformly coated with the anti-oxidation slurry. After immersion for 15 minutes, place the GH4145 high-temperature alloy billet coated with the anti-oxidation slurry in a baking oven and bake at 400°C for 2 hours so that the anti-oxidation slurry is evenly spread on the surface of the GH4145 high-temperature alloy billet, and obtain a GH4145 high-temperature alloy billet coated with a 4mm thick anti-oxidation coating.

[0067] (4) Place the GH4145 high-temperature alloy billet coated with anti-oxidation coating into a heat treatment furnace for annealing heat treatment. The furnace loading temperature is 600℃, and the annealing is carried out at 1050℃ for 1 hour. Finally, the annealed material is taken out from the annealing furnace and quickly transferred to a water cooling pool for water cooling to obtain high-temperature alloy welding material containing Al and Ti elements.

[0068] Example 4

[0069] The application of the ternary anti-oxidation coating in the preparation of high-temperature alloy welding materials containing Al and Ti elements in this embodiment includes the following steps:

[0070] (1) The components of GH4169 alloy (Al+Ti<2.0wt.%, specific composition is shown in Table 2) were melted, forged and hot rolled in sequence to obtain 100kg of GH4169 high temperature alloy billet with a specification of Φ6.5mm.

[0071] (2) Add 20kg SiC, 30kg Al2O3 and 10kg B2O3 (i.e., the mass ratio of SiC, Al2O3 and B2O3 is 2:3:1) to an appropriate amount of water and melt them into a paste to obtain an anti-oxidation slurry;

[0072] (3) Immerse the GH4169 high-temperature alloy billet obtained in step (1) in the anti-oxidation slurry prepared in step (2) so that the GH4169 high-temperature alloy billet is uniformly coated with the anti-oxidation slurry. After immersion for 10 minutes, place the GH4169 high-temperature alloy billet coated with the anti-oxidation slurry in a baking oven and bake at 300°C for 5 hours so that the anti-oxidation slurry is evenly spread on the surface of the GH4169 high-temperature alloy billet, and obtain a GH4169 high-temperature alloy billet coated with a 2mm thick anti-oxidation coating.

[0073] (4) Place the GH4169 high-temperature alloy billet coated with anti-oxidation coating into a heat treatment furnace for annealing heat treatment. The furnace loading temperature is 450℃, and the annealing is carried out at 1100℃ for 1 hour. Finally, the annealed material is taken out from the annealing furnace and quickly transferred to a water cooling pool for water cooling to obtain high-temperature alloy welding material containing Al and Ti elements.

[0074] Table 2 Chemical composition of GH4169 alloy (wt.%)

[0075]

[0076] Comparative Example 1

[0077] This comparative example provides a method for preparing high-temperature alloy welding materials containing Al and Ti elements, including the following steps:

[0078] (1) The GH4145 alloy components (specific components are the same as those in Table 1 of Example 1) were melted, forged and hot rolled in sequence to obtain 200 kg of GH4145 high temperature alloy billet with a specification of Φ8mm.

[0079] (2) The GH4145 high-temperature alloy billet obtained in step (1) is placed in a heat treatment furnace for annealing heat treatment. The furnace loading temperature is 500℃, and the annealing is carried out at 1050℃ for 1 hour. Finally, the annealed material is taken out of the annealing furnace and quickly transferred to a water cooling pool for water cooling to obtain high-temperature alloy welding material containing Al and Ti elements.

[0080] Comparative Example 2

[0081] This comparative example provides a method for preparing high-temperature alloy welding materials containing Al and Ti elements, including the following steps:

[0082] (1) The GH4169 alloy components (specific composition as shown in Table 2 of Example 4) were melted, forged and hot rolled in sequence to obtain 100kg of GH4169 high temperature alloy billet with a specification of Φ6.5mm.

[0083] (2) Add 20kg SiC, 30kg Al2O3 and 10kg B2O3 (i.e., the mass ratio of SiC, Al2O3 and B2O3 is 2:3:1) to an appropriate amount of water and melt them into a paste to obtain an anti-oxidation slurry;

[0084] (3) Immerse the GH4169 high-temperature alloy billet obtained in step (1) in the anti-oxidation slurry prepared in step (2) so that the GH4169 high-temperature alloy billet is uniformly coated with the anti-oxidation slurry. After immersion for 2 minutes, place it in a heat treatment furnace for annealing heat treatment. The furnace loading temperature is 900℃. After annealing at 1100℃ for 1 hour, take the annealed material out of the annealing furnace and quickly transfer it to a water cooling pool for water cooling to obtain high-temperature alloy welding material containing Al and Ti elements.

[0085] The cross-sectional microstructures of the high-temperature alloy welding materials containing Al and Ti elements obtained in Examples 1-4 and Comparative Examples 1 and 2 were tested, and the results are as follows: Figure 1-6As shown in the figure, the alloys in Examples 1-4 of this invention are coated with an anti-oxidation coating, so even after annealing heat treatment, almost no oxide layer is formed on the alloy surface. In contrast, in Comparative Example 1, because the alloy is not coated with an anti-oxidation coating, an inner oxide layer of about 30 μm is formed on the alloy surface after annealing heat treatment. In Comparative Example 2, because the alloy is immersed in the anti-oxidation slurry for too short a time and the furnace temperature is too high and the heat treatment time is too long during annealing heat treatment, an inner oxide layer of about 20 μm is formed on the alloy surface after annealing heat treatment, which will affect the welding performance of the alloy welding material.

[0086] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0087] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. The application of a ternary anti-oxidation coating in the preparation of high-temperature alloy welding materials containing Al and Ti elements, characterized in that, Includes the following steps: (1) Add the ternary anti-oxidation coating to water to obtain an anti-oxidation slurry; wherein the ternary anti-oxidation coating is composed of SiC, Al2O3 and B2O3 in a mass ratio of (1.5~2.5):(2.8~3.5):1; (2) The high-temperature alloy billet containing Al and Ti elements is immersed in the anti-oxidation slurry for 5 min to 20 min, and then the high-temperature alloy billet containing Al and Ti elements coated with the anti-oxidation slurry is baked at 100℃ to 500℃ to obtain a high-temperature alloy billet containing Al and Ti elements coated with an anti-oxidation coating; wherein, the mass ratio of the high-temperature alloy billet containing Al and Ti elements to the ternary anti-oxidation coating in the anti-oxidation slurry is 1:(0.5 to 1.5); (3) The high-temperature alloy billet containing Al and Ti elements coated with anti-oxidation coating is subjected to annealing heat treatment and then rapidly water-cooled to obtain high-temperature alloy welding material containing Al and Ti elements; the furnace loading temperature during the annealing heat treatment is 400℃~800℃.

2. The application of the ternary anti-oxidation coating according to claim 1 in the preparation of high-temperature alloy welding materials containing Al and Ti elements, characterized in that, The mass ratio of SiC, Al2O3 and B2O3 is 2:3:

1.

3. The application of the ternary anti-oxidation coating according to claim 1 in the preparation of high-temperature alloy welding materials containing Al and Ti elements, characterized in that, The Al and Ti-containing high-temperature alloy billet is obtained by sequentially melting, forging, and hot rolling the components of the Al and Ti-containing high-temperature alloy.

4. The application of the ternary anti-oxidation coating according to claim 1 in the preparation of high-temperature alloy welding materials containing Al and Ti elements, characterized in that, The baking process takes 2 to 6 hours.

5. The application of the ternary anti-oxidation coating according to claim 1 in the preparation of high-temperature alloy welding materials containing Al and Ti elements, characterized in that, The thickness of the anti-oxidation coating is 1mm to 5mm.

6. The application of the ternary anti-oxidation coating according to claim 1 in the preparation of high-temperature alloy welding materials containing Al and Ti elements, characterized in that, The annealing heat treatment time is 0.5h to 2.5h.

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