Nickel-based groove-face flange with high sealing performance and processing technology thereof

Abstract

The present application relates to the technical field of flange, in particular to a nickel-based groove flange with high sealing performance and a processing technology thereof. Specifically comprising the following steps: step one: after surface pretreatment of the nickel-based groove flange, it is ready for use; step two: boronizing treatment is performed on the pretreated nickel-based groove flange to obtain a modified nickel-based groove flange; step three: laser cladding technology is used to clad metal compound powder on the modified nickel-based groove flange to obtain a nickel-based groove flange with high sealing performance. In the boronizing treatment, a rare earth metal type catalyst is prepared to make the boronizing layer more dense; at the same time, a graphene / boron nitride composite powder is prepared, which is used in cooperation with other metal compound powders to form a dense metal layer on the outer surface of the nickel-based groove flange by using laser cladding technology. Finally, a nickel-based groove flange with high temperature resistance, corrosion resistance and wear resistance is obtained, which can adapt to a more severe environment and has higher sealing performance.

Description

Technical Field

[0001] This invention relates to the field of flange technology, specifically to a high-sealing nickel-based grooved flange and its processing technology. Background Technology

[0002] As is well known, a flange is a disc-shaped part, most commonly found in pipeline engineering. Alloy flanges are flanges made primarily of alloy materials, possessing excellent performance and mainly used in specialized pipelines and lines. Because flanges may need to withstand high tensile, compressive, torsional, and shear strengths during use, especially in high-temperature environments, thermal expansion and fluctuating cyclic loads can cause movement between the flange faces. Furthermore, during flange operation, phenomena such as spraying and scratching inevitably occur, leading to flange wear. The harsh working environment also makes them susceptible to corrosion. All of these factors—wear, corrosion, and the aforementioned thermal expansion—can affect the flange's sealing performance to some extent, ultimately leading to pipeline leaks. This can cause significant economic losses in actual production and has serious social consequences.

[0003] To address the aforementioned problems with flanges, this invention treats the surface of nickel-based flanges, thereby giving them excellent high-temperature resistance, wear resistance, and corrosion resistance, thus improving their sealing performance. Summary of the Invention

[0004] The purpose of this invention is to provide a high-sealing nickel-based grooved flange and its processing technology to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0006] A manufacturing process for a high-sealing nickel-based grooved flange includes the following steps:

[0007] Step 1: Perform surface pretreatment on the nickel-based channel flange and set it aside for later use;

[0008] Step 2: Perform boronizing treatment on the pretreated nickel-based channel flange to obtain a modified nickel-based channel flange;

[0009] Step 3: Use laser cladding technology to clad metal compound powder onto the modified nickel-based channel flange to obtain a high-sealing nickel-based channel flange.

[0010] In a more optimized manner, the surface pretreatment process is as follows: (1) Polishing: The nickel-based groove flange is polished sequentially with silicon carbide sandpaper with particle sizes of 180#, 360#, 600#, 1000#, 1500# and 2000#. Then, it is polished on a high-speed polishing machine with diamond polishing liquid with a particle size of 0.25μm to obtain a nickel-based groove flange with a surface roughness Ra≤0.02μm; (2) Cleaning: After polishing, the nickel-based groove flange is ultrasonically cleaned with acetone and anhydrous ethanol for 10-20 minutes in sequence, and then dried to obtain a clean nickel-based groove flange.

[0011] A more optimized method for processing the modified nickel-based channel flange is as follows: under argon protection, the nickel-based channel flange is embedded in a boronizing agent, kept at 900-1000℃ for 6-10 hours, then cooled to 600-650℃ and kept at 600-650℃ for 1-3 hours, and then furnace cooled to room temperature to obtain the modified nickel-based channel flange.

[0012] More preferably, the boronizing agent is obtained by mixing borax, boron carbide, and a penetration catalyst in a mass ratio of (1-3):1:1.

[0013] In a more optimized manner, the preparation method of the penetration catalyst is as follows: (1) Cerium nitrate is added to sufficient ethylene glycol and mechanically stirred for 1-2 hours to completely dissolve it, thereby obtaining a cerium nitrate solution; (2) Nickel nitrate is added to the cerium nitrate solution and mechanically stirred for 30-60 minutes, followed by the addition of acetic acid solution and stirring for another 15-30 minutes to obtain the reaction solution; (3) The reaction solution is heated to 160-200°C and subjected to hydrothermal reaction for 2-4 hours. After naturally cooling to room temperature, the solution is centrifuged, filtered, washed, dried, ground, and calcined to obtain the penetration catalyst.

[0014] More optimally, the calcination conditions are: calcination at 500–600°C for 1–3 hours under hydrogen protection.

[0015] Ideally, the mass ratio of cerium nitrate, nickel nitrate, and acetic acid is 1:(0.5-1):1.

[0016] The above-mentioned method involves surface treatment of nickel-based channel flanges, followed by solid boronizing to form a stable boronized layer on the flange surface. Borax is used as the base salt, and boron carbide as the boron donor. Since rare earth compounds can provide activity to the boronizing agent, thereby improving boronizing efficiency and quality, a penetration catalyst is also prepared to better utilize the rare earth compounds. This catalyst is nickel-loaded cerium dioxide composite particles, which, upon reaching the boronizing temperature, can penetrate more uniformly and firmly into the nickel-based channel flange. Furthermore, the amount of nickel nitrate used in preparing these composite particles must be controlled. Insufficient nickel salt will prevent the composite particles from forming spherical particles, failing to promote the penetration of rare earth compounds; excessive nickel salt will result in excessively rapid penetration, easily producing brittle iron boride, thus degrading the performance of the boronized layer. The rare earth metals enhance the nucleation rate of borides, resulting in a finer grain structure in the boronized layer. This makes the boronized layer more compact, significantly improving the heat resistance and wear resistance of nickel-based channel flanges. This prevents poor sealing due to thermal expansion and wear during operation.

[0017] More preferably, the metal compound mixed powder comprises the following components, by weight: 10-20 parts titanium dioxide, 3-6 parts boron oxide, 5-15 parts silicon carbide, and 5-10 parts graphene / boron nitride composite material.

[0018] The mixed powder of the metal compound needs to be crushed and passed through a 50-150# sieve.

[0019] The preparation method of the graphene / boron nitride composite material is optimized as follows: (1) dispersing sheet graphene in deionized water to prepare a graphene suspension; (2) adding boron nitride powder to the graphene suspension, ball milling for 24-48 hours, and spray granulation to obtain a mixed powder; (3) placing the mixed powder into a graphite mold and continuously applying a pressure of 30-50 MPa, heating to 2100-2200℃ at a heating rate of 70-100℃ / min under vacuum, holding for 5-15 minutes, then cooling to 1900-2000℃ and holding for 30-60 minutes to obtain the graphene / boron nitride composite material.

[0020] Ideally, the mass ratio of the sheet graphene to boron nitride is (1-2):40.

[0021] In a more optimized manner, the laser cladding technology adopts an IPG fiber laser system with the following parameters set as follows: laser power: 2500-3000W; spot diameter: 3-5mm; scanning speed: 6-7mm / s; focal length: 20mm; argon gas is used as the protective gas with a flow rate of 4-7L / min; and powder feeding speed: 10-15g / min.

[0022] Since boronizing nickel-based channel flanges can make them brittle to some extent, and to improve their corrosion resistance, this solution employs laser cladding technology. A high-energy laser beam is used to clad metal compound powder onto the nickel-based channel flange, further enhancing its heat resistance and wear resistance. Simultaneously, the boronized layer of the nickel-based channel flange is protected, and the flange is given corrosion resistance. Laser cladding results in a high bonding strength between the coating and the substrate, is easy to operate, and produces a more uniform and dense coating with good stability, exhibiting better high-temperature resistance, corrosion resistance, and wear resistance. Titanium dioxide was added to the coating material, which improved the corrosion resistance of the nickel-based groove flange. Silica effectively improved the high-temperature resistance and corrosion resistance of the coating. Since graphene can improve the corrosion resistance of metals and boron nitride can improve the wear resistance of metals, a graphene / boron nitride composite material was further prepared in the scheme. Graphene was uniformly dispersed in boron nitride to avoid graphene agglomeration. The prepared composite material has high strength and can improve the wear resistance and corrosion resistance of the coating. In synergy with silicon carbide, it can significantly improve the wear resistance of the coating.

[0023] Compared with existing technologies, the beneficial effects achieved by this invention are as follows: First, the nickel-based channel flange undergoes boronizing treatment to form a dense boronized layer on its surface. After boronizing, the high-temperature resistance of the nickel-based channel flange is significantly improved. Since boronizing often leads to brittleness of the base material, this invention further mitigates this by cladding a metal layer onto the surface of the nickel-based channel flange using a cladding technique. This metal layer protects the boronized layer and provides the nickel-based channel flange with excellent corrosion resistance and wear resistance. Through the action of these two protective layers, the nickel-based channel flange exhibits excellent corrosion resistance, high-temperature resistance, and wear resistance, enabling it to suppress the effects of thermal expansion caused by high temperatures and daily wear and corrosion, ultimately resulting in higher sealing performance. Detailed Implementation

[0024] The following are preferred embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. For those skilled in the art, all other embodiments obtained by those skilled in the art without creative effort without departing from the principles of the embodiments of the present invention are within the scope of protection of the present invention.

[0025] Example 1: A processing technology for a high-sealing nickel-based grooved flange:

[0026] Step 1: Surface pretreatment of nickel-based channel flange: (1) Polishing: Silicon carbide sandpaper with particle sizes of 180#, 360#, 600#, 1000#, 1500# and 2000# is used to polish the nickel-based channel flange made of Inconel 625 nickel-based alloy. Then, diamond polishing liquid with particle size of 0.25μm is used to polish it on a high-speed polishing machine to obtain a nickel-based channel flange with surface roughness Ra≤0.02μm; (2) Cleaning: After polishing, the nickel-based channel flange is first ultrasonically cleaned with acetone for 15min, and then ultrasonically cleaned with anhydrous ethanol for 20min twice. After drying, a clean nickel-based channel flange is obtained.

[0027] Step 2: 1. Preparation of penetration catalyst: (1) Add 50 parts of cerium nitrate to sufficient ethylene glycol and stir mechanically for 2 hours to completely dissolve it to obtain cerium nitrate solution; (2) Add 38 parts of nickel nitrate to cerium nitrate solution and stir mechanically for 60 minutes, then add 167 parts of 30wt% acetic acid solution and continue stirring for 30 minutes to obtain the reaction solution; (3) Heat the reaction solution to 180℃ and perform hydrothermal reaction for 3 hours. After it cools naturally to room temperature, centrifuge, filter, wash, dry and grind it. After grinding, place the powder in a muffle furnace and calcine it at 580℃ for 3 hours under hydrogen protection to obtain penetration catalyst;

[0028] 2. Mix borax, boron carbide, and a penetration catalyst in a mass ratio of 2:1:1 to obtain a boronizing agent;

[0029] 3. Processing method of modified nickel-based channel flange: Under argon protection, the nickel-based channel flange is embedded in boronizing agent, kept at 950℃ for 8 hours, then cooled to 650℃ and kept at 650℃ for 2 hours, and then furnace cooled to room temperature to obtain the modified nickel-based channel flange.

[0030] Step 3: 1. Preparation of graphene / boron nitride composite material: (1) Disperse 1.5 parts of sheet graphene into 50 parts of deionized water to prepare a graphene suspension; (2) Add 40 parts of boron nitride powder to the graphene suspension, ball mill for 48 hours, and spray granulate to obtain mixed powder; (3) Place the mixed powder into a graphite mold and continuously apply a pressure of 50 MPa. Under vacuum, heat the material to 2150°C at a heating rate of 80°C / min, hold for 15 minutes, then cool down to 1950°C and continue to hold for 60 minutes to obtain the graphene / boron nitride composite material.

[0031] 2. Add 18 parts of titanium dioxide, 4 parts of boron oxide, 10 parts of silicon carbide, and 6 parts of graphene / boron nitride composite material to a pulverizer for crushing and passing through a 100# sieve to obtain a mixed powder of metal compounds.

[0032] 3. Under argon protection, an IPG fiber laser system is used to clad a mixed powder of metal compounds onto a modified nickel-based grooved flange to obtain a high-sealing nickel-based grooved flange; the parameters are set as follows: laser power: 3000W; light plate diameter: 3mm; scanning speed: 6mm / s; focal length: 20mm; gas flow rate: 5L / min; powder feeding speed: 10g / min.

[0033] Example 2: A processing technology for a high-sealing nickel-based grooved flange:

[0034] Step 1: Surface pretreatment of nickel-based channel flange: (1) Polishing: Silicon carbide sandpaper with particle sizes of 180#, 360#, 600#, 1000#, 1500# and 2000# is used to polish the nickel-based channel flange made of Inconel 625 nickel-based alloy. Then, diamond polishing liquid with particle size of 0.25μm is used to polish it on a high-speed polishing machine to obtain a nickel-based channel flange with surface roughness Ra≤0.02μm; (2) Cleaning: After polishing, the nickel-based channel flange is first ultrasonically cleaned with acetone for 15min, and then ultrasonically cleaned with anhydrous ethanol for 20min twice. After drying, a clean nickel-based channel flange is obtained.

[0035] Step 2: 1. Preparation of penetration catalyst: (1) Add 50 parts of cerium nitrate to sufficient ethylene glycol and stir mechanically for 2 hours to completely dissolve it to obtain cerium nitrate solution; (2) Add 25 parts of nickel nitrate to cerium nitrate solution and stir mechanically for 60 minutes, then add 167 parts of 30wt% acetic acid solution and continue stirring for 30 minutes to obtain the reaction solution; (3) Heat the reaction solution to 180℃ and perform hydrothermal reaction for 3 hours. After it cools naturally to room temperature, centrifuge, filter, wash, dry and grind it. After grinding, place the powder in a muffle furnace and calcine it at 580℃ for 3 hours under hydrogen protection to obtain penetration catalyst;

[0036] 2. Mix borax, boron carbide, and a penetration catalyst in a mass ratio of 2:1:1 to obtain a boronizing agent;

[0037] 3. Processing method of modified nickel-based channel flange: Under argon protection, the nickel-based channel flange is embedded in boronizing agent, kept at 950℃ for 6 hours, then cooled to 600℃ and kept at 600℃ for 1 hour, and then furnace cooled to room temperature to obtain the modified nickel-based channel flange.

[0038] Step 3: 1. Preparation of graphene / boron nitride composite material: (1) Disperse 1 part of sheet graphene into 50 parts of deionized water to prepare a graphene suspension; (2) Add 40 parts of boron nitride powder to the graphene suspension, ball mill for 48 hours, and spray granulate to obtain mixed powder; (3) Place the mixed powder into a graphite mold and continuously apply a pressure of 50 MPa. Under vacuum, heat the material to 2150°C at a heating rate of 80°C / min, hold for 15 minutes, then cool down to 1950°C and hold for 60 minutes to obtain the graphene / boron nitride composite material.

[0039] 2. Add 18 parts of titanium dioxide, 4 parts of boron oxide, 10 parts of silicon carbide, and 6 parts of graphene / boron nitride composite material to a pulverizer for crushing and passing through a 100# sieve to obtain a mixed powder of metal compounds.

[0040] 3. Under argon protection, an IPG fiber laser system is used to clad a mixed powder of metal compounds onto a modified nickel-based grooved flange to obtain a high-sealing nickel-based grooved flange; the parameters are set as follows: laser power: 3000W; light plate diameter: 3mm; scanning speed: 6mm / s; focal length: 20mm; gas flow rate: 5L / min; powder feeding speed: 10g / min.

[0041] Example 3: A processing technology for a high-sealing nickel-based grooved flange:

[0042] Step 1: Surface pretreatment of nickel-based channel flange: (1) Polishing: Silicon carbide sandpaper with particle sizes of 180#, 360#, 600#, 1000#, 1500# and 2000# is used to polish the nickel-based channel flange made of Inconel 625 nickel-based alloy. Then, diamond polishing liquid with particle size of 0.25μm is used to polish it on a high-speed polishing machine to obtain a nickel-based channel flange with surface roughness Ra≤0.02μm; (2) Cleaning: After polishing, the nickel-based channel flange is first ultrasonically cleaned with acetone for 15min, and then ultrasonically cleaned with anhydrous ethanol for 20min twice. After drying, a clean nickel-based channel flange is obtained.

[0043] Step 2: 1. Preparation of penetration catalyst: (1) Add 50 parts of cerium nitrate to sufficient ethylene glycol and stir mechanically for 2 hours to completely dissolve it to obtain cerium nitrate solution; (2) Add 50 parts of nickel nitrate to cerium nitrate solution and stir mechanically for 60 minutes, then add 167 parts of 30wt% acetic acid solution and continue stirring for 30 minutes to obtain the reaction solution; (3) Heat the reaction solution to 200℃ and perform hydrothermal reaction for 4 hours. After it cools naturally to room temperature, centrifuge, filter, wash, dry and grind it. After grinding, place the powder in a muffle furnace and calcine it at 580℃ for 3 hours under hydrogen protection to obtain penetration catalyst;

[0044] 2. Mix borax, boron carbide, and a penetration catalyst in a mass ratio of 2:1:1 to obtain a boronizing agent;

[0045] 3. Processing method of modified nickel-based channel flange: Under argon protection, the nickel-based channel flange is embedded in boronizing agent, kept at 950℃ for 10h, then cooled to 600℃ and kept at 600℃ for 3h, and then furnace cooled to room temperature to obtain the modified nickel-based channel flange.

[0046] Step 3: 1. Preparation of graphene / boron nitride composite material: (1) Disperse 2 parts of sheet graphene into 50 parts of deionized water to prepare a graphene suspension; (2) Add 40 parts of boron nitride powder to the graphene suspension, ball mill for 48 hours, and granulate by spray to obtain mixed powder; (3) Place the mixed powder into a graphite mold and continuously apply a pressure of 50 MPa. Under vacuum, heat the material to 2150°C at a heating rate of 80°C / min, hold for 15 minutes, then cool down to 1950°C and hold for 60 minutes to obtain the graphene / boron nitride composite material.

[0047] 2. Add 18 parts of titanium dioxide, 4 parts of boron oxide, 10 parts of silicon carbide, and 6 parts of graphene / boron nitride composite material to a pulverizer for crushing and passing through a 100# sieve to obtain a mixed powder of metal compounds.

[0048] 3. Under argon protection, an IPG fiber laser system is used to clad a mixed powder of metal compounds onto a modified nickel-based grooved flange to obtain a high-sealing nickel-based grooved flange; the parameters are set as follows: laser power: 3000W; light plate diameter: 3mm; scanning speed: 6mm / s; focal length: 20mm; gas flow rate: 5L / min; powder feeding speed: 10g / min.

[0049] Based on Example 1, the following control experiments were conducted, specifically Comparative Examples 1 to 3, as described below:

[0050] Comparative Example 1: Step 2: 1. Mix borax and boron carbide evenly at a mass ratio of 2:1 to obtain a boronizing agent;

[0051] 2. Processing method of modified nickel-based channel flange: Under argon protection, the nickel-based channel flange is embedded in boronizing agent, kept at 950℃ for 8 hours, then cooled to 650℃ and kept at 650℃ for 2 hours, and then furnace cooled to room temperature to obtain the modified nickel-based channel flange.

[0052] Comparative Example 1 is based on Example 1, but no permeation catalyst is introduced into the boronizing agent.

[0053] Comparative Example 2: Comparative Example 2 is based on Example 1, but the nickel-based groove flange was not subjected to boronizing treatment.

[0054] Comparative Example 3: Step 2: 1. Mix borax, boron carbide and cerium oxide in a mass ratio of 2:1:1 to obtain a boronizing agent;

[0055] 2. Processing method of modified nickel-based channel flange: Under argon protection, the nickel-based channel flange is embedded in boronizing agent, kept at 950℃ for 8 hours, then cooled to 650℃ and kept at 650℃ for 2 hours, and then furnace cooled to room temperature to obtain the modified nickel-based channel flange.

[0056] Comparative Example 3 is based on Example 1, except that the penetration catalyst is replaced with cerium oxide.

[0057] Comparative Example 4: Step 3: 2. Add 18 parts of titanium dioxide, 4 parts of boron oxide, 10 parts of silicon carbide and boron nitride to a pulverizer for crushing and passing through a 100# sieve to obtain a mixed powder of metal compounds;

[0058] Comparative Example 4 is based on Example 1, but instead of preparing a graphene / boron nitride composite material, boron nitride is used.

[0059] Comparative Example 5: Comparative Example 5 is based on Example 1, but the modified nickel-based groove flange was not laser clad.

[0060] In the above embodiments, all raw materials were sourced from the following sources: sheet graphene with a purity of 99%, a sheet diameter of 0.5–5 μm, a thickness of 0.8–1.2 μm, catalog number: JK-R0801 (Shanghai Jingkang Bioengineering Co., Ltd.); borax with a purity of 95% (Henan Yejiusheng Industrial Co., Ltd.); boron carbide with a purity of 95%, catalog number: S24350 (Shanghai Yuanye Biotechnology Co., Ltd.); cerium nitrate with a purity of 99% (Jining Maikerui Rare Earth Co., Ltd.); nickel nitrate with a purity of 99% (Nanjing Reagent Co., Ltd.); cerium oxide with a purity of 99% (Jining Maikerui Rare Earth Co., Ltd.); and boron nitride with a purity of 98.5%, a particle size of 1 μm, catalog number: S40088 (Shanghai Yuanye Biotechnology Co., Ltd.).

[0061] Testing experiments: The nickel-based channel flanges obtained from Examples 1-3 and Comparative Examples 1-5 were compared with the nickel-based channel flanges made of untreated Inconel 625 nickel-based alloy in terms of corrosion resistance, high temperature resistance, and wear resistance.

[0062] Test method: 1: Corrosion resistance test: 5% HNO3 solution and 1% HCl solution were mixed to prepare the mixed acid solution. Under room temperature conditions, each group of nickel-based tank flanges were immersed in the mixed acid for corrosion and the corrosion rate was tested within the same time period; the specific data are shown in Table 1 below.

[0063] 2. High temperature resistance test: At 25℃ and 530℃, tensile stress was tested using a WE-10 hydraulic tensile testing machine at a tensile speed of 0.05mm / min. The average value of 3 sets of mechanical properties was taken for each set. The specific data are shown in Table 1 below.

[0064] 3. Wear resistance test: The wear resistance of each group of nickel-based groove flanges was tested using a friction and wear tester. The wear load was 196N and the rotation speed was 100 rpm. The wear rate after 1000 rpm was measured (wear rate = (weight of sample before test - weight of sample after test) / weight of sample before test). The specific data are shown in Table 1 below.

[0065] Table 1

[0066]

[0067]

[0068] Conclusion: As shown in Table 1 above, this invention, through boronizing and coating on nickel-based channel flanges, endows them with excellent corrosion resistance, wear resistance, and high-temperature resistance. The boronizing treatment significantly improves the strength of the nickel-based channel flange and reduces its susceptibility to high temperatures. Laser cladding to form a metallic compound coating on the surface of the nickel-based channel flange effectively enhances its corrosion resistance and wear resistance. Finally, a nickel-based channel flange with excellent corrosion resistance, high-temperature resistance, and wear resistance is obtained, enabling it to adapt to harsher working environments, exhibiting stable performance and good sealing properties.

[0069] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the spirit and principles of the present invention and within the technical scope disclosed in this application should be included within the scope of protection of this application. Where there is no conflict, the embodiments and features described in the embodiments of this application can be combined with each other. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A processing technology for a high-sealing nickel-based grooved flange, characterized in that: Includes the following steps: Step 1: Perform surface pretreatment on the nickel-based channel flange and set it aside for later use; Step 2: Perform boronizing treatment on the pretreated nickel-based channel flange to obtain a modified nickel-based channel flange; Step 3: Using laser cladding technology, metal compound powder is clad onto the modified nickel-based channel flange to obtain a high-sealing nickel-based channel flange; In step two, the modified nickel-based channel flange is processed as follows: under argon protection, the nickel-based channel flange is embedded in boronizing agent, kept at 900-1000℃ for 6-10 hours, then cooled to 600-650℃ and kept at 1-3 hours, and then furnace cooled to room temperature to obtain the modified nickel-based channel flange. The boronizing agent is obtained by mixing borax, boron carbide and a penetration catalyst in a mass ratio of (1-3):1:1; The method for preparing the penetration enhancer is as follows: (1) Add cerium nitrate to sufficient ethylene glycol and stir mechanically for 1-2 hours to completely dissolve it, thus obtaining a cerium nitrate solution; (2) Add nickel nitrate to cerium nitrate solution, stir mechanically for 30-60 min, then add acetic acid solution, and continue stirring for 15-30 min to obtain the reaction solution; (3) The reaction solution is heated to 160-200℃ and subjected to hydrothermal reaction for 2-4 hours. After it cools naturally to room temperature, it is centrifuged, filtered, washed, dried, ground, and calcined to obtain the penetration catalyst. The calcination conditions are: calcined at 500-600℃ for 1-3 hours under hydrogen protection. The mass ratio of cerium nitrate, nickel nitrate, and acetic acid is 1:(0.5-1):

1. The metal compound mixed powder comprises the following components, by weight: 10-20 parts titanium dioxide, 3-6 parts boron oxide, 5-15 parts silicon carbide, and 5-10 parts graphene / boron nitride composite material. The preparation method of the graphene / boron nitride composite material is as follows: (1) Disperse sheet graphene in deionized water to prepare a graphene suspension; (2) Add boron nitride powder to the graphene suspension, ball mill for 24–48 h, and then spray granulate to obtain a mixture. Powder; (3) The mixed powder is placed into a graphite mold and a pressure of 30-50 MPa is continuously applied. Under vacuum, the temperature is increased to 2100-2200℃ at a heating rate of 70-100℃ / min, held for 5-15 min, then cooled to 1900-2000℃ and held for 30-60 min to obtain a graphene / boron nitride composite material; wherein the mass ratio of the sheet graphene to the boron nitride is (1-2):

40. The laser cladding technology uses an IPG fiber laser system with the following parameters: laser power: 2500-3000W; spot diameter: 3-5mm; scanning speed: 6-7mm / s; focal length: 20mm; argon gas is used as the protective gas with a flow rate of 4-7L / min; and powder feeding speed: 10-15g / min.

2. A high-sealing nickel-based grooved flange prepared by the processing technology of any one of claims 1.

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