Water-erosion-resistant compressor impeller

Abstract

The application relates to a water-erosion-resistant compressor impeller, and relates to the technical field of impeller materials, which comprises an impeller base body, a high-entropy alloy layer and a super-hydrophobic layer, the super-hydrophobic layer is obtained by coating super-hydrophobic paint on the surface of the high-entropy alloy layer, and the preparation raw materials of the super-hydrophobic paint comprise the following components in mass fraction: 10-20 parts of fluorosilicon resin, 5-10 parts of modified alumina crosslinking agent, 40-60 parts of modified hyperbranched polyester, 1-2 parts of triphenyl phosphite, 0.4-0.6 parts of titanium catalyst and 40-50 parts of solvent. The application has the effect of improving the hardness and water-erosion resistance of the impeller, the impeller can resist the impact damage of water during the working process, and can maintain good working performance for a long time.

Description

Technical Field

[0001] This application relates to the field of impeller material technology, and in particular to a water erosion resistant compressor impeller. Background Technology

[0002] During the operation of an MVR steam compressor, the compressor blades operate in wet steam containing water droplets. Under the combined effects of centrifugal force, steam force, excitation force, and the scouring effect of water droplets carried by the steam, the material surface is highly susceptible to damage from the high-speed impact of water droplets or continuous water flow, severely affecting its service life. These problems significantly reduce the variable efficiency of the steam compressor during operation and easily cause stress concentration in the scouring areas. If left unprotected for extended periods, the blades will develop cracks and eventually break, leading to serious accidents and further damage to the unit.

[0003] Currently, the most common method to prevent impeller water erosion is to braze Stellite alloy sheets onto the back arc side of the blades. However, unbonded areas exist at the brazing points, leading to stress corrosion at the joints. This causes transverse cracks along the gaps between the Stellite alloy sheets, and at high speeds, the alloy sheets may even detach, causing destructive damage to the unit. Surface treatment to prepare anti-water erosion coatings on the impeller material is an effective protective measure. These coatings have smooth and dense surfaces that protect the impeller; however, existing coatings are prone to peeling and have weak adhesion to the substrate, thus requiring improvement. Summary of the Invention

[0004] In order to improve the water erosion resistance of compressor impellers, this application provides a water erosion resistant compressor impeller.

[0005] The water erosion resistant compressor impeller provided in this application adopts the following technical solution: A water-erosion resistant compressor impeller includes an impeller substrate, a high-entropy alloy layer, and a superhydrophobic layer. The superhydrophobic layer is obtained by coating the surface of the high-entropy alloy layer with a superhydrophobic coating. The raw materials for preparing the superhydrophobic coating include the following components in parts by weight: 10-20 parts of fluorosilicone resin. 5-10 parts of modified alumina crosslinking agent 40-60 parts of modified hyperbranched polyester 1-2 parts of triphenyl phosphite 0.4-0.6 parts of titanium catalyst Solvent 40-50 parts.

[0006] The impeller is protected by a high-entropy alloy layer and a superhydrophobic layer. The high-entropy alloy layer has high strength, high hardness, good wear resistance and corrosion resistance, and can promote the formation of solid solution and improve the ductility of the material. The superhydrophobic layer has low surface energy and high water contact angle. Fluorosilicone resin, by introducing fluorine and silicon elements, reduces surface energy and improves hydrophobicity and stability. Modified alumina crosslinking agent introduces alumina into the coating to improve the wear resistance of the coating. Modified hyperbranched polyester has a high degree of branching and good reactivity. The superhydrophobic coating prepared by reacting with fluorosilicone resin and modified alumina crosslinking agent has good hydrophobicity and stability, and improves the hardness, wear resistance and corrosion resistance of the superhydrophobic layer. Water droplets will quickly roll off the surface of the superhydrophobic layer, reducing the corrosive effect of water on the impeller, compensating for and repairing the impeller, and extending the service life of the impeller.

[0007] Preferably, the raw materials for preparing the fluorosilicone resin include hexadecyltrimethoxysilane, diphenyldimethoxysilane, and heptadecafluorodecyltrimethoxysilane.

[0008] Fluorosilicone resins obtained by polycondensation of hexadecyltrimethoxysilane, diphenyldimethoxysilane, and heptadecafluorodecyltrimethoxysilane introduce fluorine into the resin, improving its stability, reducing surface energy, and enhancing its weather resistance and anti-aging properties. Fluorosilicone resins also have good wettability, enabling them to adhere well to the substrate, allowing the superhydrophobic layer to better perform its anti-water erosion properties.

[0009] Preferably, the mass ratio of hexadecyltrimethoxysilane, diphenyldimethoxysilane and heptadecafluorodecyltrimethoxysilane is 1:0.5:(0.1-0.2).

[0010] The fluorosilicone resin prepared according to the above mass ratio has low surface energy, good stability and weather resistance.

[0011] Preferably, the raw materials for preparing the modified alumina crosslinking agent include nano-alumina, dimethoxymethylchlorosilane, and decanediamine.

[0012] The nano-alumina is modified by dimethoxymethylchlorosilane and decanediamine to enhance its reactivity and increase the active groups on its surface, so that the nano-alumina is uniformly dispersed in the side chains of the modified hyperbranched polyester. The nano-alumina itself has high hardness and can form a hard particle structure on the coating surface, which improves wear resistance. At the same time, it can reinforce polyester molecules and improve their stability, thereby significantly improving the water erosion resistance of the superhydrophobic layer.

[0013] Preferably, the modified hyperbranched polyester comprises an aliphatic cyclohexyl modifier, trimethylolpropane, neopentyl glycol, and 2-hydroxypropionic acid.

[0014] Preferably, the raw materials for preparing the aliphatic cyclohexyl modifier include octanoic acid and cyclohexane oxide.

[0015] Aliphatic cyclohexyl modifiers combine aliphatic segments and cyclohexyl groups, effectively improving the stability of polyesters. Cyclohexyl groups have good structural stability and rigidity, which can improve the hardness and wear resistance of polyesters and reduce the impact of water erosion on the superhydrophobic layer. Aliphatic segments can increase the flexibility and ductility of polyesters, reduce the damage of external forces to the coating, and thus improve the impeller's water erosion resistance.

[0016] Preferably, the high-entropy alloy layer is obtained by laser cladding of high-entropy alloy powder, which comprises the following components in parts by mass: molybdenum 21.33-22.75%, nickel 14.1-15.04%, cobalt 14.04-14.98%, iron 13.22-14.1%, chromium 12.31-13.13%, with the balance being a reinforcing phase.

[0017] The mixed powder, formulated with five elements—molybdenum, nickel, cobalt, iron, and chromium—has a high mixing entropy, which can reduce the free energy of the solid solution phase, promote the formation of the solid solution, and improve the strength and ductility of the high-entropy alloy layer. The reinforcing phase can make up for the shortcomings of the high-entropy alloy, improve the overall performance of the high-entropy alloy, and make the high-entropy alloy layer have both high hardness and good corrosion resistance.

[0018] Preferably, the reinforcing phase comprises silicon carbide, titanium nitride, and cerium dioxide.

[0019] Silicon carbide and titanium nitride are intermetallic compounds with high strength and hardness. Their synergistic effect, acting as reinforcing phases, can effectively improve the hardness and wear resistance of high-entropy alloys. They can also enhance the crystal structure of high-entropy alloys at the microscopic level, improving their strength and toughness and reducing damage caused by water impact during high-speed operation. Cerium dioxide has good corrosion resistance and high-temperature oxidation resistance, which can improve the stability of high-entropy alloys. Cerium dioxide can also inhibit grain growth, forming fine dispersed phases, regulating the microstructure, improving its ability to resist external forces, and reducing the friction coefficient of the high-entropy alloy surface, thus improving the water erosion resistance of the high-entropy alloy layer.

[0020] Preferably, the mass ratio of silicon carbide, titanium nitride and cerium dioxide is 1:1.55:(0.86-1.29).

[0021] The high-entropy alloy layer prepared according to the above mass ratio has high hardness and good water erosion resistance.

[0022] Preferably, the water-erosion-resistant compressor impeller is prepared using the following steps: The impeller substrate was polished with sandpaper and an angle grinder, and then cleaned with anhydrous ethanol to obtain a pretreated impeller substrate. The metal powder and reinforcing phase were mixed and dispersed in a planetary ball mill according to the formula to obtain high-entropy alloy powder. The high-entropy alloy powder was laser clad using a coaxial powder feeder to obtain a high-entropy alloy layer. A superhydrophobic coating was applied to the surface of the high-entropy alloy layer, and after drying, a water-erosion resistant compressor impeller was obtained.

[0023] The compressor impeller prepared according to the above steps has high hardness and good water erosion resistance.

[0024] In summary, this application includes at least one of the following beneficial technical effects: 1. The impeller is protected by a high-entropy alloy layer and a superhydrophobic layer. The high-entropy alloy layer has high strength, high hardness, good wear resistance and corrosion resistance, and can promote the formation of solid solution and improve the ductility of the material. The superhydrophobic layer has low surface energy and high water contact angle. Fluorosilicone resin, by introducing fluorine and silicon elements, reduces surface energy and improves hydrophobicity and stability. Modified alumina crosslinking agent introduces alumina into the coating, improving the wear resistance of the coating. Modified hyperbranched polyester has high branching degree and good reactivity. The superhydrophobic coating prepared by reacting with fluorosilicone resin and modified alumina crosslinking agent has good hydrophobicity and stability, and improves the hardness, wear resistance and corrosion resistance of the superhydrophobic layer. Water droplets will quickly roll off the surface of the superhydrophobic layer, reducing the corrosive effect of water on the impeller, compensating for and repairing the impeller, and extending the service life of the impeller.

[0025] 2. Fluorosilicone resin obtained by polycondensation of hexadecyltrimethoxysilane, diphenyldimethoxysilane and heptadecafluorodecyltrimethoxysilane. The fluorinated silane introduces fluorine into the resin, which improves the resin's stability, reduces surface energy, and enhances the weather resistance and anti-aging properties of the fluorosilicone resin. The fluorosilicone resin also has good wettability, which enables it to adhere well to the substrate, allowing the superhydrophobic layer to better perform its anti-water erosion properties.

[0026] 3. Silicon carbide and titanium nitride are intermetallic compounds with high strength and hardness. Their synergistic effect, acting as reinforcing phases, can effectively improve the hardness and wear resistance of high-entropy alloys. They can also enhance the crystal structure of high-entropy alloys at the microscopic level, improving their strength and toughness and reducing damage caused by water impact during high-speed operation. Cerium dioxide has good corrosion resistance and high-temperature oxidation resistance, which can improve the stability of high-entropy alloys. Cerium dioxide can also inhibit grain growth, form fine dispersed phases, regulate the microstructure, improve its ability to resist external forces, and at the same time reduce the friction coefficient of the high-entropy alloy surface, improving the water erosion resistance of the high-entropy alloy layer. Detailed Implementation

[0027] This application discloses a water-erosion resistant compressor impeller. Unless otherwise specified, all raw materials used in this application are commercially available. The following detailed description, in conjunction with embodiments, further illustrates this application: Raw material description: Hexadecyltrimethoxysilane (CAS No.: 16415-12-6), diphenyldimethoxysilane (CAS No.: 6843-66-9), heptadecafluorodecyltrimethoxysilane (CAS No.: 83048-65-1), octanoic acid (CAS No.: 505-48-6), cyclohexane oxide (CAS No.: 286-20-4), catalyst is organobismuth catalyst (CAS No.: 67874-71-9), neopentyl glycol (CAS No.: 126-30-7), 2-hydroxypropionic acid (CAS No.: 849585-22-4), trimethylolpropionic acid Propane (CAS No.: 77-99-6), triphenyl phosphite (CAS No.: 101-02-0), and nano-alumina were purchased from Hubei Huifu Nanomaterials Co., Ltd.; dimethoxymethylchlorosilane (CAS No.: 994-07-0), decanediamine (CAS No.: 646-25-3), and the titanium catalyst was tetrabutyl titanate (CAS No.: 5593-70-4); the solvents were propylene glycol methyl ether acetate (CAS No.: 108-65-6) and methyltriethoxysilane (CAS No.: 2031-67-6); and Silitai alloy was purchased from Suzhou Kentali Welding Technology Co., Ltd.

[0028] Example 1 To prepare fluorosilicone resin, 18.75 kg of hexadecyltrimethoxysilane, 9.375 kg of diphenyldimethoxysilane, and 1.875 kg of heptadecafluorodecyltrimethoxysilane were mixed and dispersed in 40 L of anhydrous ethanol to obtain a silane dispersion. Under stirring at 200 rpm and a water bath at 50 °C, 15 L of deionized water was added to the silane dispersion within 30 min. After reacting for 3 h, the temperature was raised to 130 °C and the reaction was continued for another 30 min to obtain a product solution. The solvent was removed by rotary evaporation of the product solution to obtain fluorosilicone resin.

[0029] Preparation of aliphatic cyclohexyl modifiers 12.79 kg of octanoic acid, 7.21 kg of cyclohexane oxide and 0.08 kg of catalyst were mixed and dispersed, heated to 70 °C under nitrogen protection and stirred and refluxed at 200 rpm for 2 h. After cooling to below 30 °C, an aliphatic cyclohexyl modifier was obtained.

[0030] Preparation of modified hyperbranched polyester 47.48 kg of neopentyl glycol, 38.93 kg of 2-hydroxypropionic acid, and 13.59 kg of trimethylolpropane were heated to melt to obtain a molten mixture. The mixture was stirred at 200 rpm and kept at this temperature for 1 hour. Then, 2 kg of triphenyl phosphite was added, and the temperature was increased to 240°C at a rate of 12°C / h to react for 2 hours. The water was evaporated, and the mixture was kept at this temperature for 1 hour. Then, the temperature was lowered to 180°C, and 20 L of xylene and 15 kg of aliphatic cyclohexyl modifier were added. The temperature was raised again to 220°C to react for 2 hours. Then, vacuum distillation was carried out, and the mixture was discharged at a temperature below 30°C to obtain hyperbranched polyester.

[0031] Preparation of modified alumina crosslinking agent 15.3 kg of nano-alumina and 2.11 kg of dimethoxymethylchlorosilane were mixed and dispersed in 200 mL of toluene and stirred at 200 rpm for 2 h. Then, 0.5 L of deionized water was added, and the mixture was stirred at 200 rpm for 4 h in an 80 °C water bath. Then, 2.59 kg of decanediamine was added, and the mixture was stirred at 200 rpm for another 4 h in an 80 °C water bath. The resulting product solution was filtered, and the solid was washed with anhydrous ethanol. The washed solid was dried in an 80 °C oven for 6 h. The dried solid was then ground to obtain the modified alumina crosslinking agent.

[0032] Preparation of superhydrophobic coatings 10 kg of fluorosilicone resin, 5 kg of modified alumina crosslinking agent, 40 kg of modified hyperbranched polyester, 1 kg of triphenyl phosphite and 0.4 kg of titanium catalyst were mixed and dispersed in 40 L of solvent. The mixture was heated to 160 °C and reacted until no water evaporated. The mixture was then cooled to below 30 °C and discharged to obtain a superhydrophobic coating.

[0033] Preparation of water erosion resistant compressor impeller The impeller substrate was polished with sandpaper and an angle grinder, and then cleaned with anhydrous ethanol to obtain a pretreated impeller substrate. 21.33 kg of molybdenum, 14.1 kg of nickel, 14.04 kg of cobalt, 13.22 kg of iron, 12.31 kg of chromium, and 25 kg of reinforcing phase were mixed and dispersed in a planetary ball mill and ball-milled at 300 rpm for three hours. The mass ratio of silicon carbide, titanium nitride, and cerium dioxide in the reinforcing phase was 1:1.55:0.86, yielding high-entropy alloy powder. The high-entropy alloy powder was then subjected to laser cladding using a coaxial powder feeder with a scanning speed of 10 mm / s, a laser spot diameter of 3 mm, a powder feed rate of 1.2 r / min, a laser power of 1200 W, and an argon flow rate of 15 L / min, resulting in a high-entropy alloy layer. A superhydrophobic coating was applied to the surface of the high-entropy alloy layer, and the mixture was vacuum-dried in an oven at 180 °C for 4 hours to obtain a water-erosion-resistant compressor impeller.

[0034] Example 2 To prepare fluorosilicone resin, 17.65 kg of hexadecyltrimethoxysilane, 8.82 kg of diphenyldimethoxysilane, and 3.53 kg of heptadecafluorodecyltrimethoxysilane were mixed and dispersed in 40 L of anhydrous ethanol to obtain a silane dispersion. Under stirring at 200 rpm and a water bath at 50 °C, 15 L of deionized water was added to the silane dispersion within 30 min. After reacting for 3 h, the temperature was raised to 130 °C and the reaction was continued for another 30 min to obtain a product solution. The solvent was removed by rotary evaporation of the product solution to obtain fluorosilicone resin.

[0035] Preparation of aliphatic cyclohexyl modifiers 12.79 kg of octanoic acid, 7.21 kg of cyclohexane oxide and 0.08 kg of catalyst were mixed and dispersed, heated to 70 °C under nitrogen protection and stirred and refluxed at 200 rpm for 2 h. After cooling to below 30 °C, an aliphatic cyclohexyl modifier was obtained.

[0036] Preparation of modified hyperbranched polyester 47.48 kg of neopentyl glycol, 38.93 kg of 2-hydroxypropionic acid, and 13.59 kg of trimethylolpropane were heated to melt to obtain a molten mixture. The mixture was stirred at 200 rpm and kept at this temperature for 1 hour. Then, 2 kg of triphenyl phosphite was added, and the temperature was increased to 240°C at a rate of 12°C / h to react for 2 hours. The water was evaporated, and the mixture was kept at this temperature for 1 hour. Then, the temperature was lowered to 180°C, and 20 L of xylene and 15 kg of aliphatic cyclohexyl modifier were added. The temperature was raised again to 220°C to react for 2 hours. Then, vacuum distillation was carried out, and the mixture was discharged at a temperature below 30°C to obtain hyperbranched polyester.

[0037] Preparation of modified alumina crosslinking agent 15.3 kg of nano-alumina and 2.11 kg of dimethoxymethylchlorosilane were mixed and dispersed in 200 mL of toluene and stirred at 200 rpm for 2 h. Then, 0.5 L of deionized water was added, and the mixture was stirred at 200 rpm for 4 h in an 80 °C water bath. Then, 2.59 kg of decanediamine was added, and the mixture was stirred at 200 rpm for another 4 h in an 80 °C water bath. The resulting product solution was filtered, and the solid was washed with anhydrous ethanol. The washed solid was dried in an 80 °C oven for 6 h. The dried solid was then ground to obtain the modified alumina crosslinking agent.

[0038] Preparation of superhydrophobic coatings 20 kg of fluorosilicone resin, 10 kg of modified alumina crosslinking agent, 60 kg of modified hyperbranched polyester, 2 kg of triphenyl phosphite and 0.6 kg of titanium catalyst were mixed and dispersed in 50 L of solvent, heated to 160 °C and reacted until no water evaporated. The mixture was then cooled to below 30 °C and discharged to obtain a superhydrophobic coating.

[0039] Preparation of water erosion resistant compressor impeller The impeller substrate was polished using sandpaper and an angle grinder, and then cleaned with anhydrous ethanol to obtain a pretreated impeller substrate. 22.75 kg of molybdenum, 15.04 kg of nickel, 14.98 kg of cobalt, 14.1 kg of iron, 13.13 kg of chromium, and 20 kg of reinforcing phase were mixed and dispersed in a planetary ball mill and ball-milled at 300 rpm for three hours. The mass ratio of silicon carbide, titanium nitride, and cerium dioxide in the reinforcing phase was 1:1.55:1.29, yielding high-entropy alloy powder. The high-entropy alloy powder was then subjected to laser cladding using a coaxial powder feeder with a scanning speed of 10 mm / s, a laser spot diameter of 3 mm, a powder feed rate of 1.2 r / min, a laser power of 1200 W, and an argon flow rate of 15 L / min, resulting in a high-entropy alloy layer. A superhydrophobic coating was applied to the surface of the high-entropy alloy layer, and the mixture was vacuum-dried in an oven at 180 °C for 4 hours to obtain a water-erosion-resistant compressor impeller.

[0040] Example 3 To prepare fluorosilicone resin, 18.18 kg of hexadecyltrimethoxysilane, 9.09 kg of diphenyldimethoxysilane, and 2.73 kg of heptadecafluorodecyltrimethoxysilane were mixed and dispersed in 40 L of anhydrous ethanol to obtain a silane dispersion. Under stirring at 200 rpm and a water bath at 50 °C, 15 L of deionized water was added to the silane dispersion within 30 min. After reacting for 3 h, the temperature was raised to 130 °C and the reaction was continued for another 30 min to obtain a product solution. The solvent was removed by rotary evaporation of the product solution to obtain fluorosilicone resin.

[0041] Preparation of aliphatic cyclohexyl modifiers 12.79 kg of octanoic acid, 7.21 kg of cyclohexane oxide and 0.08 kg of catalyst were mixed and dispersed, heated to 70 °C under nitrogen protection and stirred and refluxed at 200 rpm for 2 h. After cooling to below 30 °C, an aliphatic cyclohexyl modifier was obtained.

[0042] Preparation of modified hyperbranched polyester 47.48 kg of neopentyl glycol, 38.93 kg of 2-hydroxypropionic acid, and 13.59 kg of trimethylolpropane were heated to melt to obtain a molten mixture. The mixture was stirred at 200 rpm and kept at this temperature for 1 hour. Then, 2 kg of triphenyl phosphite was added, and the temperature was increased to 240°C at a rate of 12°C / h to react for 2 hours. The water was evaporated, and the mixture was kept at this temperature for 1 hour. Then, the temperature was lowered to 180°C, and 20 L of xylene and 15 kg of aliphatic cyclohexyl modifier were added. The temperature was raised again to 220°C to react for 2 hours. Then, vacuum distillation was carried out, and the mixture was discharged at a temperature below 30°C to obtain hyperbranched polyester.

[0043] Preparation of modified alumina crosslinking agent 15.3 kg of nano-alumina and 2.11 kg of dimethoxymethylchlorosilane were mixed and dispersed in 200 mL of toluene and stirred at 200 rpm for 2 h. Then, 0.5 L of deionized water was added, and the mixture was stirred at 200 rpm for 4 h in an 80 °C water bath. Then, 2.59 kg of decanediamine was added, and the mixture was stirred at 200 rpm for another 4 h in an 80 °C water bath. The resulting product solution was filtered, and the solid was washed with anhydrous ethanol. The washed solid was dried in an 80 °C oven for 6 h. The dried solid was then ground to obtain the modified alumina crosslinking agent.

[0044] Preparation of superhydrophobic coatings 15 kg of fluorosilicone resin, 7.5 kg of modified alumina crosslinking agent, 50 kg of modified hyperbranched polyester, 1.5 kg of triphenyl phosphite and 0.5 kg of titanium catalyst were mixed and dispersed in 45 L of solvent, heated to 160 °C and reacted until no water evaporated. The mixture was then cooled to below 30 °C and discharged to obtain a superhydrophobic coating.

[0045] Preparation of water erosion resistant compressor impeller The impeller substrate was polished with sandpaper and an angle grinder, and then cleaned with anhydrous ethanol to obtain a pretreated impeller substrate. 22.04 kg of molybdenum, 14.57 kg of nickel, 14.51 kg of cobalt, 13.66 kg of iron, 12.72 kg of chromium, and 22.5 kg of reinforcing phase were mixed and dispersed in a planetary ball mill and milled at 300 rpm for three hours. The mass ratio of silicon carbide, titanium nitride, and cerium dioxide in the reinforcing phase was 1:1.55:1.075, yielding high-entropy alloy powder. The high-entropy alloy powder was then subjected to laser cladding using a coaxial powder feeder at a scanning speed of 10 mm / s, a laser spot diameter of 3 mm, a powder feed rate of 1.2 r / min, a laser power of 1200 W, and an argon flow rate of 15 L / min, resulting in a high-entropy alloy layer. A superhydrophobic coating was applied to the surface of the high-entropy alloy layer, and the mixture was vacuum dried in an oven at 180 °C for 4 hours to obtain a water-erosion-resistant compressor impeller.

[0046] Example 4 Example 4 is based on Example 3. The only difference between Example 4 and Example 3 is that in Example 4, the amount of hexadecyltrimethoxysilane is 19.35 kg, the amount of diphenyldimethoxysilane is 9.68 kg, and the amount of heptadecafluorodecyltrimethoxysilane is 0.97 kg.

[0047] Example 5 Example 5 is based on Example 3. The only difference between Example 5 and Example 3 is that in Example 5, the amount of hexadecyltrimethoxysilane is 17.14 kg, the amount of diphenyldimethoxysilane is 8.57 kg, and the amount of heptadecafluorodecyltrimethoxysilane is 4.29 kg.

[0048] Example 6 Example 6 is based on Example 3. The only difference between Example 6 and Example 3 is that in Example 6, hexadecyltrimethoxysilane is replaced with methyltriethoxysilane when preparing fluorosilicone resin.

[0049] Example 7 Example 7 is based on Example 3. The only difference between Example 7 and Example 3 is that in Example 7, diphenyldimethoxysilane is replaced with methyltriethoxysilane when preparing fluorosilicone resin.

[0050] Example 8 Example 8 is based on Example 3. The only difference between Example 8 and Example 3 is that decanediamine is not added when preparing the modified alumina crosslinking agent in Example 8.

[0051] Example 9 Example 9 is based on Example 3. The only difference between Example 9 and Example 3 is that in Example 9, the aliphatic cyclohexyl modifier is replaced with cyclohexane oxide when preparing the modified hyperbranched polyester.

[0052] Example 10 Example 10 is based on Example 3. The only difference between Example 10 and Example 3 is that the mass ratio of silicon carbide, titanium nitride and cerium dioxide in Example 10 is 1:1.55:0.75.

[0053] Example 11 Example 11 is based on Example 3. The only difference between Example 11 and Example 3 is that the mass ratio of silicon carbide, titanium nitride and cerium dioxide in Example 11 is 1:1.55:1.4.

[0054] Example 12 Example 12 is based on Example 3. The only difference between Example 12 and Example 3 is that silicon carbide is not added when preparing high-entropy alloy powder in Example 12.

[0055] Example 13 Example 13 is based on Example 3. The only difference between Example 13 and Example 3 is that titanium nitride is not added when preparing high-entropy alloy powder in Example 13.

[0056] Example 14 Example 14 is based on Example 3. The only difference between Example 14 and Example 3 is that cerium dioxide is not added when preparing the high-entropy alloy powder in Example 14.

[0057] Comparative Example 1 Comparative Example 1 is based on Example 3. The only difference between Comparative Example 1 and Example 3 is that the fluorosilicone resin in Comparative Example 1 is replaced with heptadecafluorodecyltrimethoxysilane.

[0058] Comparative Example 2 Comparative Example 2 is based on Example 3. The only difference between Comparative Example 2 and Example 3 is that the modified alumina crosslinking agent in Comparative Example 2 is replaced with nano alumina.

[0059] Comparative Example 3 Comparative Example 3 is based on Example 3. The only difference between Comparative Example 3 and Example 3 is that no aliphatic cyclohexyl modifier was added when preparing the modified hyperbranched polyester in Comparative Example 3.

[0060] Comparative Example 4 Comparative Example 4 is based on Example 3. The only difference between Comparative Example 4 and Example 3 is that the high-entropy alloy powder is replaced with Silita alloy in Comparative Example 4.

[0061] Performance testing (1) Hardness test: Vickers hardness tester was used to test and calculate the Vickers hardness of the sample. Each sample was tested three times and the average value was taken after measurement. The results are recorded in Table 1.

[0062] (2) Wear resistance test: Prepare the test specimens for the experiment, clean the specimens, dry them and weigh them before wear, put them into the testing machine for wear test, clean and dry them again after the test, record the weight after wear, calculate the wear loss weight, prepare three specimens for each sample, take the average value after measurement, and record the results in Table 1.

[0063] (3) Corrosion resistance test: Prepare the test specimens for the experiment, and conduct a three-week immersion test in a simulated humid atmospheric environment. Record the weight of the specimens before and after the test, calculate the corrosion weight loss, prepare three specimens for each sample, and take the average value after measurement. The results are recorded in Table 1.

[0064] Table 1. Test results of impeller hardness and water erosion resistance As shown in Table 1, the hardness of Examples 1-3 is greater than 936 HV, the wear weight loss is less than 0.26 g, and the corrosion weight loss is less than 8.2 mg, which shows that the compressor impeller prepared in this application has high hardness and good water erosion resistance.

[0065] As shown in Table 1, the only difference between Examples 4 and 5 and Example 3 is that in Example 4, the mass ratio of hexadecyltrimethoxysilane, diphenyldimethoxysilane, and heptadecafluorodecyltrimethoxysilane is 1:0.5:0.05, and in Example 5, the mass ratio is 1:0.5:0.25. Compared with Example 3, the hardness and water erosion resistance of Examples 4 and 5 are reduced. This is because the mass ratio of hexadecyltrimethoxysilane, diphenyldimethoxysilane, and heptadecafluorodecyltrimethoxysilane is not within the specified range. Too much or too little fluorinated silane will affect the hydrophobicity, stability, and wetting properties, and the stability of the superhydrophobic layer will decrease, thus reducing the hardness and water erosion resistance.

[0066] As shown in Table 1, the only difference between Examples 6 and 7 and Example 3 is that in Example 6, hexadecyltrimethoxysilane was replaced with methyltriethoxysilane when preparing the fluorosilicone resin, and in Example 7, diphenyldimethoxysilane was replaced with methyltriethoxysilane when preparing the fluorosilicone resin. Compared with Example 3, the hardness and water erosion resistance of Examples 6 and 7 decreased. This is because the synthetic components of the fluorosilicone resin were replaced, and the lack of phenyl and long-chain alkyl structures will affect the structural rigidity and resistance to external impact of the fluorosilicone resin, thus reducing its hardness and water erosion resistance.

[0067] As shown in Table 1, the only difference between Examples 8 and 9 and Example 3 is that: in Example 8, decanediamine was not added when preparing the modified alumina crosslinking agent; and in Example 9, the aliphatic cyclohexyl modifier was replaced with cyclohexane oxide when preparing the modified hyperbranched polyester. Compared with Example 3, the hardness and water erosion resistance of Examples 8 and 9 decreased. This is because without the addition of decanediamine, the dispersibility and reactivity of the modified alumina crosslinking agent decreased, thus affecting the gain effect. Replacing the aliphatic cyclohexyl modifier with cyclohexane oxide resulted in the lack of introduction of aliphatic long chains, which reduced the flexibility and ductility of the polyester and weakened its resistance to external damage, thereby reducing its water erosion resistance.

[0068] As shown in Table 1, the only difference between Examples 10 and 11 and Example 3 is that the mass ratio of silicon carbide, titanium nitride, and cerium dioxide in Example 10 is 1:1.55:0.75, while the mass ratio of silicon carbide, titanium nitride, and cerium dioxide in Example 11 is 1:1.55:1.4. Compared with Example 3, the hardness and water erosion resistance of Examples 10 and 11 are reduced. This is because the mass ratio of silicon carbide, titanium nitride, and cerium dioxide is not within the specified range. Too much or too little cerium dioxide will affect the microstructure and grain size distribution of the high-entropy alloy, reduce the stability of the high-entropy alloy, and thus reduce the hardness and water erosion resistance.

[0069] As shown in Table 1, the differences between Examples 12, 13, and 14 and Example 3 are only as follows: silicon carbide was not added when preparing the high-entropy alloy powder in Example 12, titanium nitride was not added when preparing the high-entropy alloy powder in Example 13, and cerium dioxide was not added when preparing the high-entropy alloy powder in Example 14. Compared with Example 3, the hardness and water erosion resistance of Examples 12, 13, and 14 decreased. This is because the composition of the reinforcing phase was reduced, and the absence of silicon carbide or titanium nitride would destroy the synergistic effect of the two, thereby reducing the hardness and wear resistance of the high-entropy alloy. The absence of cerium dioxide would affect the microstructure of the high-entropy alloy, increase its surface friction coefficient, and thus reduce the hardness and water erosion resistance.

[0070] As shown in Table 1, the only difference between Comparative Example 1 and Example 3 is that the fluorosilicone resin in Comparative Example 1 was replaced with heptadecafluorodecyltrimethoxysilane. Compared with Example 3, the hardness and water erosion resistance of Comparative Example 1 decreased significantly. This is because replacing the fluorosilicone resin with heptadecafluorodecyltrimethoxysilane results in the lack of co-condensation of alkylsilane and phenylsilane, which reduces the rigidity, reactivity, and compatibility of the fluorosilicone resin, thereby affecting the stability and bonding force of the superhydrophobic layer, resulting in a significant decrease in hardness and water erosion resistance.

[0071] As shown in Table 1, the only difference between Comparative Example 2 and Example 3 is that Comparative Example 2 replaced the modified alumina crosslinking agent with nano-alumina. Compared with Example 3, the hardness and water erosion resistance of Comparative Example 2 decreased significantly. This is because replacing the modified alumina crosslinking agent with nano-alumina, without modification treatment, makes nano-alumina prone to agglomeration, reducing its dispersibility and reactivity, and greatly reducing the gain effect, thus significantly reducing the hardness and water erosion resistance of the impeller.

[0072] As shown in Table 1, the only difference between Comparative Example 3 and Example 3 is that no aliphatic cyclohexyl modifier was added when preparing the modified hyperbranched polyester in Comparative Example 3. Compared with Example 3, the hardness and water erosion resistance of Comparative Example 3 decreased. This is because without the addition of aliphatic cyclohexyl modifier, the stability of the polyester decreased and its ability to resist external damage weakened, thus reducing the hardness and water erosion resistance of the impeller.

[0073] As shown in Table 1, the only difference between Comparative Example 4 and Example 3 is that Comparative Example 4 replaced the high-entropy alloy powder with Silita alloy. Compared with Example 3, the hardness and water erosion resistance of Comparative Example 4 decreased significantly. This is because replacing the high-entropy alloy powder with Silita alloy slightly reduces the high-temperature performance and corrosion resistance of Silita alloy, and the lack of reinforcing phase introduction leads to a decrease in hardness and corrosion resistance, thus significantly reducing the hardness and water erosion resistance of the impeller.

[0074] This specific embodiment is merely an explanation of this application and is not intended to limit it. Based on the above description, those skilled in the art can make various changes and modifications without departing from the technical concept of this application. The technical scope of this application is not limited to the contents of the specification but must be determined according to the scope of the claims.

Claims

1. A water-erosion resistant compressor impeller, characterized in that: It includes an impeller substrate, a high-entropy alloy layer, and a superhydrophobic layer. The superhydrophobic layer is obtained by coating the surface of the high-entropy alloy layer with a superhydrophobic coating. The raw materials for preparing the superhydrophobic coating include the following components in parts by mass: 10-20 parts of fluorosilicone resin 5-10 parts of modified alumina crosslinking agent 40-60 parts of modified hyperbranched polyester 1-2 parts of triphenyl phosphite 0.4-0.6 parts of titanium catalyst Solvent 40-50 parts; The raw materials for preparing the fluorosilicone resin include hexadecyltrimethoxysilane, diphenyldimethoxysilane, and heptadecafluorodecyltrimethoxysilane; the mass ratio of hexadecyltrimethoxysilane, diphenyldimethoxysilane, and heptadecafluorodecyltrimethoxysilane is 1:0.5:(0.1-0.2). The raw materials for preparing the modified alumina crosslinking agent include nano-alumina, dimethoxymethylchlorosilane, and decanediamine; The modified hyperbranched polyester comprises an aliphatic cyclohexyl modifier, trimethylolpropane, neopentyl glycol, and 2-hydroxypropionic acid; The raw materials for preparing the aliphatic cyclohexyl modifier include octanoic acid and cyclohexane oxide.

2. The water-erosion resistant compressor impeller according to claim 1, characterized in that: The high-entropy alloy layer is obtained by laser cladding of high-entropy alloy powder, which comprises the following components in parts by mass: molybdenum 21.33-22.75%, nickel 14.1-15.04%, cobalt 14.04-14.98%, iron 13.22-14.1%, chromium 12.31-13.13%, with the balance being a reinforcing phase.

3. The water-erosion resistant compressor impeller according to claim 2, characterized in that: The reinforcing phase includes silicon carbide, titanium nitride, and cerium dioxide.

4. The water-erosion resistant compressor impeller according to claim 3, characterized in that: The mass ratio of silicon carbide, titanium nitride and cerium dioxide is 1:1.55:(0.86-1.29).

5. The water-erosion resistant compressor impeller according to claim 1, characterized in that: The water-cavitation resistant compressor impeller is prepared using the following steps: The impeller substrate was polished with sandpaper and an angle grinder, and then cleaned with anhydrous ethanol to obtain a pretreated impeller substrate. The metal powder and reinforcing phase were mixed and dispersed in a planetary ball mill according to the formula to obtain high-entropy alloy powder. The high-entropy alloy powder was laser clad using a coaxial powder feeder to obtain a high-entropy alloy layer. A superhydrophobic coating was applied to the surface of the high-entropy alloy layer, and after drying, a water-erosion resistant compressor impeller was obtained.

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