Special expanded ring for energy storage water tank inversion and preparation process thereof

Abstract

The application discloses a special expanding ring for energy storage water tank inversion and a preparation process thereof, belongs to the technical field of metal processing, and aims at the technical problem that the rigidity, strength and wear resistance of the special expanding ring for energy storage water tank inversion need to be further improved. The special expanding ring is prepared by the following steps: uniformly mixing metal powder and lubricant, adding the mixture into an aluminum phosphate glue solution to uniformly mix, obtaining a paste, loading the paste into an expanding ring mold to press into an expanding ring green body, sintering the expanding ring green body, performing surface treatment after the sintering is completed, and finally spraying a protective layer coating on the surface of the expanding ring green body, and drying to obtain the special expanding ring for energy storage water tank inversion. The special expanding ring is prepared by the crosslinking of the prepared aluminum phosphate glue in the green body and the combination of the protective layer coating and the green body, so that the rigidity, strength and wear resistance of the special expanding ring for energy storage water tank inversion are further improved.

Description

Technical Field

[0001] This invention relates to the field of metal processing technology, specifically to a special expansion ring for inverting energy storage water tanks and its manufacturing process. Background Technology

[0002] The inverted installation process for energy storage water tanks is widely used in the field of energy storage equipment manufacturing due to its advantages such as high installation efficiency and good construction safety. As the core load-bearing component in the inverted installation process, the mechanical properties and wear resistance stability of the expansion ring directly affect the assembly accuracy and service life of the water tank. Currently, the expansion rings used for inverted installation of energy storage water tanks are mostly made of conventional metal materials or simple composite structures, and there is still room for improvement in terms of strength, rigidity and long-term wear resistance.

[0003] In existing expansion ring manufacturing processes, the bonding system mostly uses conventional inorganic adhesives, which are difficult to form a stable interfacial bond with the metal matrix and ceramic reinforcing phase. This easily leads to the presence of pores and weak areas inside the green body after sintering, making it prone to plastic deformation under external forces and affecting the overall load-bearing capacity. At the same time, the inorganic fillers used in the coating system are mostly single components, failing to form a multi-component synergistic reinforcing structure. On the one hand, it is impossible to construct a continuous hard and wear-resistant skeleton inside the coating, resulting in limited resistance to abrasive wear and fatigue wear. On the other hand, the interfacial compatibility between the filler and the matrix and resin is poor, making the coating prone to problems such as peeling and flaking, and unable to provide long-term protection. In addition, some nanofillers have not undergone surface modification treatment, resulting in insufficient surface active sites. They cannot form a strong chemical bond with the expansion ring green body, nor can they effectively improve the internal density of the coating, making it difficult to achieve full structural performance optimization from the matrix to the coating.

[0004] The aforementioned problems limit the existing expansion rings in terms of tensile strength, yield strength, and surface hardness. Furthermore, they experience significant wear after long-term frictional service, which affects the stability of the inverted installation of energy storage tanks and the service life of the equipment.

[0005] To address this technical deficiency, a solution is proposed. Summary of the Invention

[0006] The purpose of this invention is to provide a special expansion ring for inverted installation of energy storage water tanks and its manufacturing process, in order to solve the technical problem that the rigidity, strength and wear resistance of the special expansion ring for inverted installation of energy storage water tanks in the prior art need to be further improved.

[0007] The objective of this invention can be achieved through the following technical solutions: A manufacturing process for a special expansion ring used for inverting energy storage water tanks includes the following steps: S1. Add iron powder, copper powder, chromium powder, ferrosilicon, ferromanganese, tungsten carbide, titanium carbide and graphite into a mixer and dry mix for 1-2 hours. Then add aluminum phosphate glue solution and continue mixing for 30-60 minutes until the material is a uniform paste. Then put it into an expansion ring mold and hold it under pressure at 70-80℃ and 200-220MPa for 5-7 seconds to obtain the expansion ring green body. S2. Place the expansion ring green blank into a sintering furnace for sintering. After sintering, cool it to room temperature with the furnace. Then, immerse the expansion ring in a phosphoric acid solution for 10-15 minutes, remove it and immerse it in a silane coupling agent solution for 5-8 minutes. Remove it and dry it at 100-120℃ for 1-2 hours to obtain the expansion ring green body. S3. Spray a protective coating with a thickness of 0.2-0.3mm onto the surface of the expansion ring blank, dry it at 20-30℃ for 20-30 minutes, and then dry it at 110-120℃ for 1-2 hours to obtain a special expansion ring for inverting energy storage water tanks.

[0008] Furthermore, in step S1, the ratio of the amounts of iron powder, copper powder, chromium powder, ferrosilicon, ferromanganese, tungsten carbide, titanium carbide, graphite, and aluminum phosphate gel solution is 58g:6-8g:4-6g:5-7g:3-5g:8-10g:4-6g:3-4g:10-14mL, and the mass fraction of the aluminum phosphate gel solution is 50%.

[0009] Further, in step S2, the detailed sintering steps are as follows: the expanded ring green blank is placed in a sintering furnace and heated to 200-300℃ at a heating rate of 2-5℃ / min, held for 1-2 hours, then heated to 400-500℃ for pre-sintering for 60-90 minutes, then heated to 800-900℃ for sintering for 120-150 minutes, and finally heated to 1100-1200℃ for sintering for 3-4 hours; the mass fraction of the phosphoric acid solution is 13%, and the silane coupling agent solution is obtained by dissolving 1g KH-560 in a mixed solution of 16-17mL and 2-3mL deionized water.

[0010] Further, in step S1, the preparation method of the aluminum phosphate gel is as follows: aluminum hydroxide powder and zirconium hydroxide powder are added to a reaction vessel containing a phosphoric acid solution, and stirred at 80-90℃ for 40-60 min. Then, silicon powder and boron carbide powder are added, and stirring is continued for 6-8 h to obtain aluminum phosphate gel. The ratio of the amount of phosphoric acid solution, aluminum hydroxide powder, zirconium hydroxide powder, silicon powder and boron carbide powder is 100mL:25g:8-10g:10-12g:4-6g, and the mass fraction of the phosphoric acid solution is 60%.

[0011] Further, in step S3, the preparation method of the protective coating is as follows: epoxy resin is added to xylene and stirred for 20-30 minutes, then magnesium silicon nitride powder, composite nano silica, mica iron oxide ash, dispersant and leveling agent are added, and stirred at a speed of 1200-1500 r / min for 20-30 minutes. Then defoamer is added, and stirred for 3-5 minutes. The mixture is then passed through a 200-mesh sieve to obtain the protective coating.

[0012] Furthermore, the ratio of the amount of epoxy resin, xylene, magnesium silicon nitride powder, composite nano silica, mica iron oxide ash, dispersant, leveling agent and defoamer is 30g:40-45mL:5-7g:4-5g:8-10g:0.6-0.8g:0.5g:0.2g.

[0013] Furthermore, the preparation method of the silicon magnesium nitride powder is as follows: after mixing magnesium nitride powder and silicon nitride powder evenly, the mixture is kept at 1200-1300°C for 2-3 hours under a flowing nitrogen atmosphere, then the temperature is raised to 1500°C and kept at that temperature for 1-2 hours. After the reaction is completed, the mixture is cooled to room temperature, ground, and passed through a 300-mesh sieve to obtain silicon magnesium nitride powder; the ratio of magnesium nitride powder to silicon nitride powder is 1g:1.4g.

[0014] Furthermore, the composite nano-silica is prepared by the following steps: A1. Add nano-silica to a reaction vessel containing deionized water, and ultrasonically disperse for 30-40 min. Then, add the mixed solution dropwise. After the addition is complete, stir at 20-30℃ for 20-24 h. Wash with deionized water 3-4 times and centrifuge. Place the product in a vacuum drying oven and dry at 80℃ to constant weight to obtain modified nano-silica. A2. Add the modified nano-silica to a reaction vessel containing anhydrous ethanol, and ultrasonically disperse for 20-30 min. Then, add hexadecylamine ethanol solution dropwise. After the addition is complete, add triethylamine and stir at 50-60℃ for 15-18 h. Wash with warm water and ethanol 3-4 times and centrifuge. Place the product in a vacuum drying oven and dry at 60℃ to constant weight to obtain composite nano-silica.

[0015] Further, in step A1, the mixed solution is obtained by dissolving 0.15g of dopamine in 15mL of Tris buffer, and the ratio of the amount of nano-silica, deionized water and the mixed solution is 0.3g:10-15mL:15mL; in step A2, the ratio of the amount of modified nano-silica, anhydrous ethanol, hexadecylamine ethanol solution and triethylamine is 0.3g:45-55mL:45-55mL:1g, and the mass fraction of the hexadecylamine ethanol solution is 0.6%.

[0016] Furthermore, the special expansion ring for inverting energy storage water tanks is prepared by a special expansion ring manufacturing process for inverting energy storage water tanks.

[0017] The present invention has the following beneficial effects: In the preparation process of a special expansion ring for inverted installation of energy storage water tanks, zirconium-modified aluminum phosphate adhesive uses aluminum, zirconium, phosphorus, silicon, and boron as core elements. A high-strength inorganic cross-linked skeleton is constructed through -Zr-OP, Si-OP, and Si-O-Al- covalent bonds. This skeleton can form a tight interface bond with metal matrices such as iron powder, copper powder, and chromium powder, as well as hard particles of tungsten carbide and titanium carbide. This eliminates internal pores and weak interfacial areas in the sintered blank, improving the overall load-bearing capacity and structural rigidity from the matrix level. The silicon nitride magnesium powder, rich in magnesium, silicon, and nitrogen ternary ceramic phases, is distributed within the protective coating as a dispersed reinforcing phase, forming a hard, wear-resistant skeleton that interacts with the coating matrix. The composite nano-silica, after being coated with polydopamine and grafted with hexadecylamine, forms a mechanical interlocking and chemical bond, effectively dispersing external loads and suppressing local plastic deformation. The active groups on the surface of the composite nano-silica, after being coated with polydopamine and grafted with hexadecylamine, form a stable covalent bond with the active sites on the surface of the expansion ring blank after being activated by the coupling agent. This achieves a strong interfacial bond between the coating and the blank, and it can also be fully compatible and bonded with coating components such as epoxy resin and silicon magnesium nitride powder, constructing a continuous, dense, and firmly bonded protective layer structure. The three work synergistically, working together from three dimensions: matrix reinforcement, interface strengthening, and coating reinforcement, to significantly improve the tensile strength, yield strength, and Rockwell hardness of the expansion ring.

[0018] In the preparation process of a special expansion ring for inverted installation of energy storage water tanks, zirconium-modified aluminum phosphate adhesive enables a gapless and tight bond between the metal matrix and the ceramic reinforcing phase, reducing particle shedding and interface peeling during friction service and providing an excellent anti-wear matrix for the expansion ring. Silicon nitride magnesium powder, with its high hardness, high chemical stability, and low friction characteristics, forms a continuous wear-resistant network in the coating, effectively resisting abrasive wear and contact fatigue wear. Composite nano-silica, with its core-shell structure, has surface-modified functional groups that form strong chemical bonds with the expansion ring blank surface, preventing the coating from peeling and flaking under frictional shearing. Simultaneously, hydrophobic long-chain alkyl groups reduce the surface friction coefficient of the coating, reducing direct wear at the friction interface. The core-shell structure also fills microcracks and micropore defects within the coating, improving coating density and wear resistance. These three elements complement and synergize in terms of internal bonding within the blank, coating structure enhancement, and interface friction optimization, ensuring stable and reliable wear resistance under long-term reciprocating friction service conditions. Detailed Implementation

[0019] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] In this application, the iron powder has a mesh size of 300 and an iron content of ≥90%; In this application, the copper powder has a mesh size of 1000 and a copper content of ≥99.9%; In this application, the chromium powder has a mesh size of 300 and a chromium content of ≥86%; In this application, the ferrosilicon has a mesh size of 325 and a silicon content of 3.2%. In this application, the ferromanganese has a mesh size of 300 and a manganese content of ≥70%; In this application, the tungsten carbide has a mesh size of 150 and a tungsten content of ≥99.99%; In this application, the titanium carbide has a mesh size of 200 and a titanium content of ≥99.5%; In this application, the graphite has a mesh size of 325. In this application, the aluminum hydroxide powder has a mesh size of 1250 and a purity of ≥99.5%; In this application, the zirconium hydroxide powder has a mesh size of 200 and an effective ingredient content of ≥99%; In this application, the epoxy resin is selected from Shanghai Nanmu Chemical Co., Ltd., CAS No. 61788-97-4; In this application, the mica iron oxide ash is selected from Shijiazhuang Fanchang New Material Technology Co., Ltd., and the mesh size is 325. In this application, the magnesium nitride powder has a mesh size of 20,000 and an effective ingredient content of ≥99.9%; In this application, the silicon nitride powder has a mesh size of 200 and a silicon content of ≥99.9%; In this application, the nano-silica has a mesh size of 325 and an effective ingredient content of ≥99%.

[0021] Example 1

[0022] This embodiment provides a manufacturing process for a special expansion ring used for inverted installation of energy storage water tanks, including the following steps: S1. Preparation of aluminum phosphate gel: Weigh out 250g of aluminum hydroxide powder and 80g of zirconium hydroxide powder and add them to a reaction vessel containing 1000mL of 60wt% phosphoric acid solution. Stir at 80℃ for 40min, then add 100g of silicon powder and 40g of boron carbide powder and continue stirring for 6h to obtain aluminum phosphate gel.

[0023] Reaction mechanism for preparing aluminum phosphate gel: Under hydrothermal conditions, aluminum hydroxide and phosphoric acid undergo acid-base neutralization and stepwise coordination condensation to generate an aluminum phosphate colloidal matrix. Zirconium hydroxide reacts simultaneously with phosphoric acid to form a complexed zirconium phosphate and is incorporated into the aluminum phosphate network via Zr-OP bonds, achieving in-situ modification of zirconium and constructing a stable inorganic cross-linked framework. Subsequently, silicon powder and boron carbide powder are introduced and stirred for a long time. Elemental silicon reacts slowly in the acidic system to generate active silicon species, which further cross-link and reinforce the network through Si-OP and Si-O-Al bonds. Boron carbide, as inert hard particles, is uniformly dispersed and fills the gaps in the colloidal framework, playing a role in particle reinforcement, inhibiting crystal transformation, and improving thermal expansion matching. After wetting, dispersion, interfacial bonding, and dehydration curing, the components finally form a zirconium-modified aluminum phosphate-based adhesive system.

[0024] S2. Preparation of mixed powder: Weigh out 580g of iron powder, 60g of copper powder, 40g of chromium powder, 50g of ferrosilicon, 30g of ferromanganese, 80g of tungsten carbide, 40g of titanium carbide, and 30g of graphite and add them to a mixer. Dry mix for 1 hour. Then add 100mL of 50wt% aluminum phosphate glue solution and continue mixing for 30 minutes until the material becomes a uniform paste. Then, put it into an expansion ring mold and pressurize it at 70℃ and 200MPa for 5 seconds to obtain the expansion ring green body.

[0025] S3. Preparation of the expansion ring blank: Weigh out 10g of KH-560 and dissolve it in a mixed solution of 160mL and 20mL of deionized water to obtain a silane coupling agent solution. The expansion ring green blank was placed in a sintering furnace and heated to 200℃ at a heating rate of 2℃ / min, held for 1 hour, then heated to 400℃ for pre-sintering for 60 minutes. After that, it was heated to 800℃ for sintering for 120 minutes, and finally heated to 1100℃ for sintering for 3 hours. After sintering, it was cooled to room temperature with the furnace. Then, the expansion ring was immersed in a 13wt% phosphoric acid solution for 10 minutes, removed, and then immersed in a silane coupling agent solution for 5 minutes. After that, it was dried at 100℃ for 1 hour to obtain the expansion ring green body.

[0026] S4. Preparation of magnesium silicon nitride powder: Weigh out 100g of magnesium nitride powder and 140g of silicon nitride powder, mix them evenly, and then keep them at 1200°C for 2 hours under a flowing nitrogen atmosphere. Then, raise the temperature to 1500°C and keep them at that temperature for another hour. After the reaction is complete, cool to room temperature, grind, and pass through a 300-mesh sieve to obtain magnesium silicon nitride powder.

[0027] Reaction mechanism for preparing magnesium silicon nitride powder: During the reaction, magnesium nitride and silicon nitride powders are mixed and pre-calcined in a flowing nitrogen atmosphere to activate the particle surface and promote atomic diffusion. Then, at high temperature, magnesium nitride and silicon nitride undergo an interfacial chemical reaction. Magnesium atoms and silicon atoms rearrange and recombine under the bridging effect of nitrogen atoms to generate magnesium silicon nitride crystal phase. After the reaction is completed, the powder is cooled, ground, and sieved to obtain high-purity, fine-particle-size magnesium silicon nitride powder.

[0028] S5. Preparation of composite nano-silica: Weigh out 15g of dopamine and dissolve it in 1500mL of Tris buffer to obtain a mixed solution; Weigh 30g of nano-silica and add it to a reaction vessel containing 1000mL of deionized water. After ultrasonic dispersion for 30min, add 1500mL of mixed solution dropwise. After the addition is complete, stir at 20℃ for 20h. Wash with deionized water 3 times and centrifuge. Place the product in a vacuum drying oven and dry at 80℃ to constant weight to obtain modified nano-silica. Weigh 3g of modified nano-silica and add it to a reaction vessel containing 450mL of anhydrous ethanol. After ultrasonic dispersion for 20min, add 450mL of 0.6wt% hexadecylamine ethanol solution dropwise. After the addition is complete, add 10g of triethylamine. Stir at 50℃ for 15h. Wash three times with warm water and ethanol and centrifuge. Place the product in a vacuum drying oven and dry at 60℃ to constant weight to obtain composite nano-silica.

[0029] Reaction mechanism for preparing composite nano-silica: During the reaction, the self-polymerization property of dopamine in weakly alkaline Tris buffer is utilized to coat the surface of nano-silica with a polydopamine intermediate layer rich in active catechol and amino functional groups. Subsequently, under the catalysis of triethylamine, the amino group of hexadecylamine molecule is covalently grafted to the active site of the polydopamine layer through Michael addition reaction, thereby introducing hydrophobic long-chain alkyl groups on the surface of nano-silica, and finally obtaining a composite nano-silica with a core-shell structure and a hydrophobic surface.

[0030] S6. Preparation of protective coating: Weigh 300g of epoxy resin and add it to 400mL of xylene. Stir for 20 minutes. Then add 50g of magnesium silicon nitride powder, 40g of composite nano silica, 80g of mica iron oxide ash, 6g of dispersant and 5g of leveling agent. Stir at 1200r / min for 20 minutes. Then add 2g of defoamer and stir for 3 minutes. Pass the mixture through a 200-mesh sieve to obtain the protective coating.

[0031] S7. Prepare a special expansion ring for inverting energy storage water tanks: A protective coating with a thickness of 0.2 mm is sprayed onto the surface of the expansion ring blank. After drying at 20℃ for 20 min, it is then dried at 110℃ for 1 h to obtain a special expansion ring for inverting energy storage water tanks.

[0032] Example 2

[0033] This embodiment provides a manufacturing process for a special expansion ring used for inverted installation of energy storage water tanks, including the following steps: S1. Preparation of aluminum phosphate gel: Weigh out 250g of aluminum hydroxide powder and 90g of zirconium hydroxide powder and add them to a reaction vessel containing 1000mL of 60wt% phosphoric acid solution. Stir at 85℃ for 50min, then add 110g of silicon powder and 50g of boron carbide powder and continue stirring for 7h to obtain aluminum phosphate gel.

[0034] S2. Preparation of mixed powder: Weigh out 580g of iron powder, 70g of copper powder, 50g of chromium powder, 60g of ferrosilicon, 40g of ferromanganese, 90g of tungsten carbide, 50g of titanium carbide, and 35g of graphite and add them to a mixer. Dry mix for 1.5 hours. Then add 120mL of 50wt% aluminum phosphate glue solution and continue mixing for 45 minutes until the material becomes a uniform paste. Then, put it into an expansion ring mold and hold it under pressure at 75℃ and 210MPa for 6 seconds to obtain the expansion ring green body.

[0035] S3. Preparation of the expansion ring blank: Weigh out 10g of KH-560 and dissolve it in a mixed solution of 165mL and 25mL of deionized water to obtain a silane coupling agent solution. The expansion ring green body was placed in a sintering furnace and heated to 250°C at a heating rate of 3°C / min, held at that temperature for 1.5 hours, then heated to 450°C for pre-sintering for 75 minutes. After that, the temperature was increased to 850°C for sintering for 130 minutes, and finally heated to 1100°C for sintering for 3.5 hours. After sintering, the expansion ring was cooled to room temperature with the furnace. Then, the expansion ring was immersed in a 13wt% phosphoric acid solution for 12 minutes, removed, and then immersed in a silane coupling agent solution for 6 minutes. After that, it was dried at 110°C for 1.5 hours to obtain the expansion ring green body.

[0036] S4. Preparation of magnesium silicon nitride powder: Weigh out 100g of magnesium nitride powder and 140g of silicon nitride powder, mix them evenly, and then keep them at 1250°C for 2.5h under a flowing nitrogen atmosphere. Then raise the temperature to 1500°C and keep them at that temperature for another 1.5h. After the reaction is complete, cool to room temperature, grind, and pass through a 300-mesh sieve to obtain magnesium silicon nitride powder.

[0037] S5. Preparation of composite nano-silica: Weigh out 15g of dopamine and dissolve it in 1500mL of Tris buffer to obtain a mixed solution; Weigh 30g of nano-silica and add it to a reaction vessel containing 1200mL of deionized water. After ultrasonic dispersion for 35min, add 1500mL of the mixed solution dropwise. After the addition is complete, stir at 25℃ for 22h. Wash with deionized water 3 times and centrifuge. Place the product in a vacuum drying oven and dry at 80℃ to constant weight to obtain modified nano-silica. Weigh 3g of modified nano-silica and add it to a reaction vessel containing 500mL of anhydrous ethanol. After ultrasonic dispersion for 25min, add 500mL of 0.6wt% hexadecylamine ethanol solution dropwise. After the addition is complete, add 10g of triethylamine. Stir at 55℃ for 16h. Wash three times with warm water and ethanol and centrifuge. Place the product in a vacuum drying oven and dry at 60℃ to constant weight to obtain composite nano-silica.

[0038] S6. Preparation of protective coating: Weigh 300g of epoxy resin and add it to 420mL of xylene. Stir for 25 minutes. Then add 60g of magnesium silicon nitride powder, 45g of composite nano silica, 90g of mica iron oxide ash, 7g of dispersant and 5g of leveling agent. Stir at 1300r / min for 25 minutes. Then add 2g of defoamer and stir for 4 minutes. Pass the mixture through a 200-mesh sieve to obtain the protective coating.

[0039] S7. Prepare a special expansion ring for inverting energy storage water tanks: A protective coating with a thickness of 0.25 mm is sprayed onto the surface of the expansion ring blank. It is first dried at 25℃ for 25 minutes, and then dried at 115℃ for 1.5 hours to obtain a special expansion ring for inverting energy storage water tanks.

[0040] Example 3

[0041] This embodiment provides a manufacturing process for a special expansion ring used for inverted installation of energy storage water tanks, including the following steps: S1. Preparation of aluminum phosphate gel: Weigh out 250g of aluminum hydroxide powder and 100g of zirconium hydroxide powder and add them to a reaction vessel containing 1000mL of 60wt% phosphoric acid solution. Stir at 90℃ for 60min, then add 120g of silicon powder and 60g of boron carbide powder and continue stirring for 8h to obtain aluminum phosphate gel.

[0042] S2. Preparation of mixed powder: Weigh out 580g of iron powder, 80g of copper powder, 60g of chromium powder, 70g of ferrosilicon, 50g of ferromanganese, 100g of tungsten carbide, 60g of titanium carbide, and 40g of graphite and add them to a mixer. Dry mix for 2 hours. Then add 140mL of 50wt% aluminum phosphate glue solution and continue mixing for 60 minutes until the material becomes a uniform paste. Then, put it into an expansion ring mold and pressurize it at 80℃ and 220MPa for 7 seconds to obtain the expansion ring green body.

[0043] S3. Preparation of the expansion ring blank: Weigh out 10g of KH-560 and dissolve it in a mixed solution of 170mL and 30mL of deionized water to obtain a silane coupling agent solution. The expansion ring green body was placed in a sintering furnace and heated to 300℃ at a heating rate of 5℃ / min, held for 2 hours, then heated to 500℃ for pre-sintering for 90 minutes. After that, it was heated to 900℃ for sintering for 150 minutes, and finally heated to 1200℃ for sintering for 4 hours. After sintering, it was cooled to room temperature with the furnace. Then, the expansion ring was immersed in a 13wt% phosphoric acid solution for 15 minutes, removed, and then immersed in a silane coupling agent solution for 8 minutes. After that, it was dried at 120℃ for 2 hours to obtain the expansion ring green body.

[0044] S4. Preparation of magnesium silicon nitride powder: Weigh out 100g of magnesium nitride powder and 140g of silicon nitride powder, mix them evenly, and then keep them at 1300°C for 3 hours under a flowing nitrogen atmosphere. Then, raise the temperature to 1500°C and keep them at that temperature for another 2 hours. After the reaction is complete, cool to room temperature, grind, and pass through a 300-mesh sieve to obtain magnesium silicon nitride powder.

[0045] S5. Preparation of composite nano-silica: Weigh out 15g of dopamine and dissolve it in 1500mL of Tris buffer to obtain a mixed solution; Weigh 30g of nano-silica and add it to a reaction vessel containing 1500mL of deionized water. After ultrasonic dispersion for 40min, add 1500mL of the mixed solution dropwise. After the addition is complete, stir at 30℃ for 24h. Wash with deionized water 4 times and centrifuge. Place the product in a vacuum drying oven and dry at 80℃ to constant weight to obtain modified nano-silica. Weigh 3g of modified nano-silica and add it to a reaction vessel containing 550mL of anhydrous ethanol. After ultrasonic dispersion for 30min, add 550mL of 0.6wt% hexadecylamine ethanol solution dropwise. After the addition is complete, add 10g of triethylamine. Stir at 60℃ for 18h. Wash with warm water and ethanol 4 times and centrifuge. Place the product in a vacuum drying oven and dry at 60℃ to constant weight to obtain composite nano-silica.

[0046] S6. Preparation of protective coating: Weigh 300g of epoxy resin and add it to 450mL of xylene. Stir for 30min. Then add 70g of magnesium silicon nitride powder, 50g of composite nano silica, 100g of mica iron oxide ash, 8g of dispersant and 5g of leveling agent. Stir at 1500r / min for 30min. Then add 2g of defoamer and stir for 5min. Pass the mixture through a 200-mesh sieve to obtain the protective coating.

[0047] S7. Prepare a special expansion ring for inverting energy storage water tanks: A protective coating with a thickness of 0.3 mm is sprayed onto the surface of the expansion ring blank. It is first dried at 30℃ for 30 minutes, and then dried at 120℃ for 2 hours to obtain a special expansion ring for inverting energy storage water tanks.

[0048] Comparative Example 1 The difference between this comparative example and Example 3 is that step S1 is omitted, and the aluminum phosphate solution in step S2 is replaced with an aqueous sodium silicate solution.

[0049] Comparative Example 2 The difference between this comparative example and Example 3 is that step S4 is omitted, and the magnesium nitride powder in step S4 is used instead of the magnesium silicon nitride powder in step S6.

[0050] Comparative Example 3 The difference between this comparative example and Example 3 is that step S5 is omitted, and the composite nano-silica in step S6 is replaced with nano-silica in step S5.

[0051] Performance testing: The tensile strength and yield strength of a special expansion ring for inverted energy storage water tanks prepared in Examples 1-3 and Comparative Examples 1-3 were determined according to the standard GB / T 228.1-2021 "Metallic materials, tensile testing - Part 1: Test method at room temperature". The Rockwell hardness of a special expansion ring for inverted energy storage water tanks prepared in Examples 1-3 and Comparative Examples 1-3 was determined according to the standard GB / T 230.1-2018 "Metallic materials - Rockwell hardness test - Part 1: Test method". The volume wear of a special expansion ring for inverted energy storage water tank prepared in Examples 1-3 and Comparative Examples 1-3 was determined after 1 hour of volume wear test according to the standard GB / T 12444-2006 "Metallic Materials Wear Test Method Test Ring-Block Sliding Wear Test". The specific test results are shown in Table 1 below: Table 1 - Performance Test Data of Samples Data Analysis: Comparative analysis of the data in Table 1 above shows that the tensile strength of the special expansion ring prepared by this invention for inverted installation of energy storage water tanks is 1105 MPa, the yield strength is 736 MPa, the Rockwell hardness is 50, and the volumetric wear is 12.7 mm. 3 ; Comparative Example 1 used an aqueous sodium silicate solution instead of the zirconium-modified aluminum phosphate adhesive of the present invention. Because sodium silicate cannot form a Zr-OP, Si-OP, or Si-O-Al covalent cross-linked framework, it cannot form a strong interfacial bond with the metal matrix and ceramic phase. This results in a large number of pores and weak interfaces inside the green body, significantly reducing its load-bearing capacity. Consequently, its tensile strength decreased to 754 MPa, its yield strength to 562 MPa, and its Rockwell hardness to 36. Simultaneously, the weak interfacial bond made it easy for particles to detach during friction, resulting in a volumetric wear of up to 25.9 mm. 3 ; Comparative Example 2 used magnesium nitride powder instead of the silicon-magnesium nitride powder of the present invention. Because magnesium nitride lacks the dispersion reinforcement and hard skeleton effect of the magnesium, silicon, and nitrogen ternary ceramic phase, it cannot form an effective load transfer and deformation-resistant structure in the coating. This results in a decrease in its tensile strength to 967 MPa, yield strength to 684 MPa, and Rockwell hardness to 41. Furthermore, it lacks a highly stable ceramic wear-resistant phase, leading to a decrease in its resistance to abrasive wear and an increase in volumetric wear to 19.4 mm. 3 ; Comparative Example 3 used ordinary nano-silica instead of the composite nano-silica of the present invention. Ordinary nano-silica lacks the polydopamine and hexadecylamine modification layers, and therefore cannot form covalent bonds with the activation sites of the preform. The coating has poor adhesion to the preform and is prone to peeling off. At the same time, it cannot effectively fill coating defects or reduce the coefficient of friction, resulting in a decrease in tensile strength to 925 MPa, yield strength to 636 MPa, and Rockwell hardness to 43. Insufficient interfacial bonding and increased frictional loss led to a volumetric wear of 17.5 mm. 3 .

[0052] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the invention or exceed the scope defined by the present invention, and all such modifications or additions should fall within the protection scope of the present invention.

[0053] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example 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.

[0054] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to specific implementations. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A manufacturing process for a special expansion ring used for inverting energy storage water tanks, characterized in that, Includes the following steps: S1. Add aluminum hydroxide powder and zirconium hydroxide powder to the reaction vessel containing phosphoric acid solution, stir at 80-90℃ for 40-60 min, then add silicon powder and boron carbide powder, and continue stirring for 6-8 h to obtain aluminum phosphate gel. S2. Add iron powder, copper powder, chromium powder, ferrosilicon, ferromanganese, tungsten carbide, titanium carbide and graphite into a mixer and dry mix for 1-2 hours. Then add aluminum phosphate glue solution and continue mixing for 30-60 minutes until the material is a uniform paste. Then put it into an expansion ring mold and hold it under pressure at 70-80℃ and 200-220MPa for 5-7 seconds to obtain the expansion ring green body. S3. Place the expansion ring green body into a sintering furnace for sintering. After sintering, cool it to room temperature with the furnace. Then, immerse the expansion ring in a phosphoric acid solution for 10-15 minutes, remove it and immerse it in a silane coupling agent solution for 5-8 minutes. Remove it and dry it at 100-120℃ for 1-2 hours to obtain the expansion ring green body. S4. Add nano-silica to a reaction vessel containing deionized water, and ultrasonically disperse for 30-40 min. Then, add the mixed solution dropwise. After the addition is complete, stir at 20-30℃ for 20-24 h. Wash with deionized water 3-4 times and centrifuge. Place the product in a vacuum drying oven and dry at 80℃ to constant weight to obtain modified nano-silica. S5. Add the modified nano-silica to a reaction vessel containing anhydrous ethanol, and ultrasonically disperse for 20-30 min. Then, add hexadecylamine ethanol solution dropwise. After the addition is complete, add triethylamine and stir at 50-60℃ for 15-18 h. Wash with warm water and ethanol 3-4 times and centrifuge. Place the product in a vacuum drying oven and dry at 60℃ to constant weight to obtain composite nano-silica. S6. Add epoxy resin to xylene and stir for 20-30 minutes. Then add magnesium silicon nitride powder, composite nano silica, mica iron oxide ash, dispersant and leveling agent. Stir at 1200-1500 r / min for 20-30 minutes. Then add defoamer and stir for 3-5 minutes. Pass through a 200-mesh sieve to obtain the protective coating. S7. Spray a protective coating with a thickness of 0.2-0.3mm onto the surface of the expansion ring blank, dry it at 20-30℃ for 20-30 minutes, and then dry it at 110-120℃ for 1-2 hours to obtain a special expansion ring for inverting energy storage water tanks.

2. The manufacturing process of a special expansion ring for inverted installation of energy storage water tanks according to claim 1, characterized in that, In step S2, the ratio of the amount of iron powder, copper powder, chromium powder, ferrosilicon, ferromanganese, tungsten carbide, titanium carbide, graphite and aluminum phosphate gel solution is 58g:6-8g:4-6g:5-7g:3-5g:8-10g:4-6g:3-4g:10-14mL, and the mass fraction of the aluminum phosphate gel solution is 50%.

3. The manufacturing process of a special expansion ring for inverted installation of energy storage water tanks according to claim 1, characterized in that, In step S3, the detailed sintering steps are as follows: the expanded ring green blank is placed in the sintering furnace and heated to 200-300℃ at a heating rate of 2-5℃ / min, held for 1-2 hours, then heated to 400-500℃ for pre-sintering for 60-90 minutes, then heated to 800-900℃ for sintering for 120-150 minutes, and finally heated to 1100-1200℃ for sintering for 3-4 hours; the mass fraction of the phosphoric acid solution is 13%, and the silane coupling agent solution is obtained by dissolving 1g KH-560 in a mixed solution of 16-17mL and 2-3mL deionized water.

4. The manufacturing process of a special expansion ring for inverted installation of energy storage water tanks according to claim 1, characterized in that, In step S1, the aluminum phosphate gel is prepared by using the following method: the ratio of phosphoric acid solution, aluminum hydroxide powder, zirconium hydroxide powder, silicon powder and boron carbide powder is 100mL:25g:8-10g:10-12g:4-6g, and the mass fraction of the phosphoric acid solution is 60%.

5. The manufacturing process of a special expansion ring for inverted installation of an energy storage water tank according to claim 1, characterized in that, In step S6, the ratio of epoxy resin, xylene, magnesium silicon nitride powder, composite nano silica, mica iron oxide ash, dispersant, leveling agent and defoamer is 30g:40-45mL:5-7g:4-5g:8-10g:0.6-0.8g:0.5g:0.2g.

6. The manufacturing process of a special expansion ring for inverted installation of an energy storage water tank according to claim 1, characterized in that, In step S6, the preparation method of the magnesium silicon nitride powder is as follows: after mixing magnesium nitride powder and silicon nitride powder evenly, the mixture is kept at 1200-1300℃ for 2-3 hours under a flowing nitrogen atmosphere, then the temperature is raised to 1500℃ and kept at that temperature for 1-2 hours. After the reaction is completed, the mixture is cooled to room temperature, ground, and passed through a 300-mesh sieve to obtain magnesium silicon nitride powder; the ratio of magnesium nitride powder to silicon nitride powder is 1g:1.4g.

7. The manufacturing process of a special expansion ring for inverted installation of energy storage water tanks according to claim 1, characterized in that, In step S4, the mixed solution is obtained by dissolving 0.15g of dopamine in 15mL of Tris buffer, and the ratio of the amount of nano-silica, deionized water and the mixed solution is 0.3g:10-15mL:15mL; in step S5, the ratio of the amount of modified nano-silica, anhydrous ethanol, hexadecylamine ethanol solution and triethylamine is 0.3g:45-55mL:45-55mL:1g, and the mass fraction of the hexadecylamine ethanol solution is 0.6%.

8. A special expansion ring for inverting an energy storage water tank according to any one of claims 1-7, characterized in that, The special expansion ring for inverting energy storage water tanks is prepared by the preparation process of claims 1-7.

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