High-strength wear-resistant aluminum material for roller shutter door and preparation method thereof

Abstract

The invention relates to the technical field of metal, and discloses a high-strength wear-resistant aluminum material for a roller shutter door and a preparation method of the high-strength wear-resistant aluminum material. The preparation method comprises the steps that S1, a basic aluminum material is taken, laser cladding is conducted through mixed powder, and a titanium-nickel-silicon-tungsten layer with the thickness being 0.1-0.2 mm is formed on the surface of the basic aluminum material; the mixed powder comprises titanium powder, nickel powder, silicon powder and tungsten nitride powder in a mass ratio of (30-40): (30-40): (5-10): (1-5); the particle size is 200 meshes; s2, nitriding treatment is conducted on the aluminum material obtained in the step S1 and subjected to laser cladding; s3, the nitrided aluminum material obtained in the step S2 is subjected to surface sand blasting treatment; and S4, the surface of the aluminum material subjected to sand blasting treatment obtained in the step S3 is coated with wear-resistant paint, the coating thickness is 3-5 microns, curing and drying are conducted, and the high-strength wear-resistant aluminum material is obtained.

Description

Technical Field

[0001] The invention relates to the technical field of metals and discloses a high-strength wear-resistant aluminum material for rolling shutter doors and a preparation method thereof. Background Art

[0002] Rolling shutters are a common building protection facility and are widely used in commercial, industrial and civil buildings. Due to their high frequency of use and complex working environment, they have high requirements for material strength, wear resistance and other properties.

[0003] Aluminum alloys, composed of aluminum as the base element, offer advantages such as low density, excellent corrosion resistance, and high plasticity. They can be processed into a variety of profiles and are the most widely used nonferrous metal material, particularly in the manufacture of rolling shutters. However, traditional aluminum materials used for rolling shutters suffer from insufficient strength, poor wear resistance, and easy deformation, which impacts the doors' service life and reliability. Therefore, the development of a high-strength, wear-resistant aluminum material and its preparation method is of great significance. Summary of the Invention

[0004] The object of the present invention is to provide a high-strength wear-resistant aluminum material for rolling shutter doors and a preparation method thereof, so as to solve the problems raised in the above-mentioned background technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: A method for preparing a high-strength wear-resistant aluminum material for rolling shutter doors, comprising the following steps: S1: taking a base aluminum material, laser cladding a mixed powder, and forming a 0.1-0.2 mm titanium-nickel-silicon-tungsten layer on the surface of the base aluminum material;

[0006] S2: performing nitriding treatment on the laser-clad aluminum material obtained in step S1;

[0007] S3: performing surface sandblasting on the nitrided aluminum material obtained in step S2;

[0008] S4: coating the surface of the sandblasted aluminum material obtained in step S3 with a wear-resistant coating having a coating thickness of 3 to 5 μm, and curing and drying at 80° C. for 1 to 2 hours to obtain a high-strength wear-resistant aluminum material.

[0009] More optimally, the mixed powder includes high-purity titanium powder, nickel powder, silicon powder, and tungsten nitride powder in a mass ratio of (30-40): (30-40): (5-10): (1-5); the particle size of each is 200 mesh.

[0010] More optimally, laser cladding is carried out in an argon protection chamber, using a coaxial powder feeding method, a laser power of 1500-1600W, a laser beam spot diameter of 2-3mm, and a laser scanning speed of 5-10mm / s.

[0011] More optimally, the nitriding process is: arc DC 90-120A, the atmosphere is a mixture of nitrogen and argon, the gas flow rate of nitrogen is 7-10L / min, the gas flow rate of argon is 0-5L / min, and the tungsten electrode travel speed is 2.5-3.0mm / s.

[0012] More optimized, the sandblasting process: the nitrided aluminum material is placed in the jig of the sandblasting equipment, the sand particles used in the sandblasting equipment are 60-100 mesh white corundum, the air pressure of the sandblasting equipment is adjusted to 3-6 MPa, and the sandblasting is performed, and the sandblasting time is 30-60 seconds.

[0013] More optimally, the basic aluminum material includes the following components, calculated by mass percentage: Zn: 0.02-0.05%, Mg: 2.0-2.5%, Cu: 0.5-1.0%, Mn: 0.01-0.02%, Si: 0.04-0.05%, Fe: 0.1-0.2%, Ti: 0.001-0.005%, and the balance is Al and unavoidable impurities.

[0014] More optimally, the preparation of the wear-resistant coating includes the following steps: Step 1: adding aluminum oxide, silicon oxide, silicon carbide, silicon nitride, and titanium carbide to ethanol for ball milling, placing them in a planetary ball mill for 6 hours at a ball milling speed of 5000 rpm, taking them out respectively, drying them at 120°C, and calcining them in a high-temperature furnace after drying; wherein, aluminum oxide and silicon oxide are calcined at 1200°C and kept warm for 2 hours, silicon carbide, silicon nitride, and titanium carbide are calcined at 1500°C and kept warm for 3 hours, and the calcined powders are ground again, sieved through 600 mesh, and mixed to obtain a wear-resistant filler;

[0015] Step 2: Mix γ-aminopropyltriethoxysilane, sodium hydroxide, 2-chloro-4,6-diphenyl-1,3,5-triazine, and toluene under nitrogen protection, stir and react at 20-30° C. for 2-3 hours, and remove the solvent to obtain modified silane;

[0016] Step 3: Dissolve tetraethoxysilane in isopropanol, add water and ammonia water, stir at 50-60°C for 4-5 hours, adjust the pH to 3-4, add γ-aminopropyltriethoxysilane, stir at 50-60°C for 3-4 hours, add tridecafluorooctyltriethoxysilane and modified silane, continue stirring for 5-6 hours to obtain nanosol; add fluorosilicone resin, wear-resistant filler, γ-(2,3-epoxypropoxy)propyltrimethoxysilane, stir for 1-2 hours to obtain wear-resistant coating.

[0017] More optimally, the wear-resistant filler comprises the following raw materials, calculated by weight: 20-25 parts of aluminum oxide, 25-30 parts of silicon oxide, 3-5 parts of silicon carbide, 10-15 parts of silicon nitride, and 10-15 parts of titanium carbide; purchased from Zhongtianli New Materials;

[0018] The modified silane comprises the following raw materials, calculated by mass: 20 to 25 parts of γ-aminopropyltriethoxysilane, 3 to 5 parts of sodium hydroxide, 25 to 30 parts of 2-chloro-4,6-diphenyl-1,3,5-triazine, and 100 to 150 parts of toluene;

[0019] The nanosol comprises the following raw materials, calculated by mass: 10-15 parts of tetraethoxysilane, 100-150 parts of isopropyl alcohol, 10-15 parts of water, 3-5 parts of ammonia water, 2-3 parts of γ-aminopropyltriethoxysilane, 1-2 parts of tridecafluorooctyltriethoxysilane, and 3-4 parts of modified silane;

[0020] The added amount of fluorosilicone resin is 15-25% of the mass of nanosol; the added amount of wear-resistant filler is 15-25% of the mass of nanosol; and the added amount of gamma-(2,3-epoxypropoxy)propyltrimethoxysilane is 1-2% of the mass of nanosol.

[0021] More optimally, the fluorosilicone resin is a fluorosilicone resin containing active groups, specifically KX-501B fluorosilicone resin, manufactured by Guangzhou Kanglunxi Fluorosilicon Technology.

[0022] Compared with the existing technology, the beneficial effects achieved by the present invention are as follows: the aluminum material is subjected to nitriding treatment, and the surface hardness and wear resistance of the nitrided aluminum material are significantly improved, and the tensile strength is also improved; in order to improve the performance of the nitrided layer, the present solution first forms a titanium-nickel-silicon-tungsten layer on the surface of the aluminum material through laser cladding, which not only improves the strength and hardness of the aluminum material but also serves as a base layer. On the one hand, the metal layer prepared by the laser cladding process has high uniformity, which can improve the surface quality of the aluminum material and facilitate the nitriding process. On the other hand, the introduction of silicon can generate silicon nitride in the nitriding process, and then react with aluminum to generate aluminum nitride, thereby increasing the generation rate of aluminum nitride and further improving the performance of the nitrided layer;

[0023] After the nitriding treatment, sandblasting is performed to further improve the surface hardness and wear resistance. Uniform microscopic pits are formed on the surface, and the surface roughness is improved, which helps to improve the adhesion of the coating in the subsequent steps.

[0024] After sandblasting, a wear-resistant coating is applied. High-hardness wear-resistant fillers are added to the wear-resistant coating to further improve surface hardness and wear resistance. The wear-resistant fillers can be evenly dispersed under the action of silane. The wear-resistant coating also introduces modified silane, whose raw materials include 2-chloro-4,6-diphenyl-1,3,5-triazine, which has a good planar structure and promotes the adsorption of the coating to the metal surface.

[0025] In summary, a high-strength aluminum material with high hardness and high wear resistance was produced through the process steps of laser cladding preparation of the base layer, nitriding, sandblasting, and coating of wear-resistant coating. DETAILED DESCRIPTION

[0026] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0027] It should be noted that there is no special restriction on the purchase manufacturers of all raw materials involved in the present invention, and illustratively include: ethanol (CAS: 64-17-5); tetraethoxysilane (CAS: 78-10-4); ammonia (25%, Yongyue Chemical); tridecafluorooctyltriethoxysilane (CAS: 51851-37-7); fluorosilicone resin (KX-501B fluorosilicone resin, Guangzhou Kanglun Xifluorosilicone Technology); γ-(2,3-epoxypropyloxy)propyltrimethoxysilane (CAS: 2530-83-8); 2-chloro-4,6-diphenyl-1,3,5-triazine (CAS: 3842-55-5);

[0028] Unless otherwise specified, the following are parts by mass and mass ratios;

[0029] The basic aluminum material includes the following components, calculated by mass percentage: Zn: 0.03%, Mg: 2.5%, Cu: 0.5%, Mn: 0.01%, Si: 0.05%, Fe: 0.2%, Ti: 0.003%, and the balance is Al and unavoidable impurities;

[0030] Example 1: S1: A base aluminum material was laser clad with a mixed powder to form a 0.1 mm thick titanium-nickel-silicon-tungsten layer on its surface; the mixed powder consisted of titanium powder, nickel powder, silicon powder, and tungsten nitride powder in a mass ratio of 30:40:8:4, with a particle size of 200 mesh. The laser cladding was performed in an argon shielded chamber using coaxial powder feeding, a laser power of 1600 W, a laser beam spot diameter of 2.5 mm, and a laser scanning speed of 7 mm / s.

[0031] S2: Nitriding the laser-clad aluminum material; Nitriding process: Arc DC 90A, atmosphere is a mixture of nitrogen and argon, nitrogen gas flow rate is 8L / min, argon gas flow rate is 4L / min, tungsten electrode travel speed is 2.5mm / s;

[0032] S3: Surface sandblasting of the nitrided aluminum material: The nitrided aluminum material is placed in a fixture of a sandblasting device. The sand grains used in the sandblasting device are 80 mesh white corundum. The air pressure of the sandblasting device is adjusted to 5 MPa, and the sandblasting is performed for 40 seconds.

[0033] S4: 20 parts of aluminum oxide, 25 parts of silicon oxide, 3 parts of silicon carbide, 10 parts of silicon nitride, and 10 parts of titanium carbide are respectively added to ethanol for ball milling, and then placed in a planetary ball mill for ball milling for 6 hours at a ball milling speed of 5000 rpm. The powders are taken out separately, dried at 120°C, and then calcined in a high-temperature furnace after drying; wherein, aluminum oxide and silicon oxide are calcined at 1200°C and kept warm for 2 hours, and silicon carbide, silicon nitride, and titanium carbide are calcined at 1500°C and kept warm for 3 hours. The calcined powders are ground again, sieved through 600 mesh, and then mixed to obtain a wear-resistant filler;

[0034] S5: Mix 24 parts of γ-aminopropyltriethoxysilane, 4 parts of sodium hydroxide, 28 parts of 2-chloro-4,6-diphenyl-1,3,5-triazine, and 100 parts of toluene under nitrogen protection, stir at 25°C for 3 hours, and remove the solvent to obtain modified silane;

[0035] S6: dissolving 10 parts of tetraethoxysilane in 100 parts of isopropanol, adding 12 parts of water and 3 parts of ammonia water, heating the reaction at 55°C for 5 hours, adjusting the pH to 3, then adding 2 parts of γ-aminopropyltriethoxysilane, stirring at 60°C for 3 hours, adding 1 part of tridecafluorooctyltriethoxysilane and 4 parts of modified silane, and continuing to stir for 6 hours to obtain a nanosol; adding 20 wt% of fluorosilicone resin by weight of the nanosol, 20 wt% of wear-resistant filler by weight of the nanosol, and 2 wt% of γ-(2,3-epoxypropoxy)propyltrimethoxysilane by weight of the nanosol, and stirring for 2 hours to obtain a wear-resistant coating;

[0036] S7: Apply a wear-resistant coating to the surface of the sandblasted aluminum material with a coating thickness of 4 μm, and cure it at 80° C. for 1 hour to obtain a high-strength wear-resistant aluminum material.

[0037] Example 2: S1: A base aluminum material was laser clad with a mixed powder to form a 0.1 mm thick titanium-nickel-silicon-tungsten layer on its surface; the mixed powder consisted of titanium powder, nickel powder, silicon powder, and tungsten nitride powder in a mass ratio of 40:40:10:5, with a particle size of 200 mesh. The laser cladding was performed in an argon shielded chamber using coaxial powder feeding. The laser power was 1600 W, the laser beam spot diameter was 2.5 mm, and the laser scanning speed was 7 mm / s.

[0038] S2: Nitriding the laser-clad aluminum material; Nitriding process: Arc DC 90A, atmosphere is a mixture of nitrogen and argon, nitrogen gas flow rate is 8L / min, argon gas flow rate is 4L / min, tungsten electrode travel speed is 2.5mm / s;

[0039] S3: Surface sandblasting of the nitrided aluminum material: The nitrided aluminum material is placed in a fixture of a sandblasting device. The sand grains used in the sandblasting device are 80 mesh white corundum. The air pressure of the sandblasting device is adjusted to 5 MPa, and the sandblasting is performed for 40 seconds.

[0040] S4: 20 parts of aluminum oxide, 25 parts of silicon oxide, 3 parts of silicon carbide, 10 parts of silicon nitride, and 10 parts of titanium carbide are respectively added to ethanol for ball milling, and then placed in a planetary ball mill for ball milling for 6 hours at a ball milling speed of 5000 rpm. The powders are taken out separately, dried at 120°C, and then calcined in a high-temperature furnace after drying; wherein, aluminum oxide and silicon oxide are calcined at 1200°C and kept warm for 2 hours, and silicon carbide, silicon nitride, and titanium carbide are calcined at 1500°C and kept warm for 3 hours. The calcined powders are ground again, sieved through 600 mesh, and then mixed to obtain a wear-resistant filler;

[0041] S5: Mix 25 parts of γ-aminopropyltriethoxysilane, 4 parts of sodium hydroxide, 30 parts of 2-chloro-4,6-diphenyl-1,3,5-triazine, and 100 parts of toluene under nitrogen protection, stir and react at 25°C for 3 hours, and remove the solvent to obtain modified silane;

[0042] S6: dissolving 15 parts of tetraethoxysilane in 100 parts of isopropanol, adding 12 parts of water and 3 parts of ammonia water, heating the reaction at 55°C for 5 hours, adjusting the pH to 3, then adding 2 parts of γ-aminopropyltriethoxysilane, stirring at 50°C for 4 hours, adding 2 parts of tridecafluorooctyltriethoxysilane and 3 parts of modified silane, and continuing to stir for 6 hours to obtain a nanosol; adding 20 wt% of fluorosilicone resin by weight of the nanosol, 20 wt% of wear-resistant filler by weight of the nanosol, and 2 wt% of γ-(2,3-epoxypropoxy)propyltrimethoxysilane by weight of the nanosol, and stirring for 2 hours to obtain a wear-resistant coating;

[0043] S7: Apply a wear-resistant coating to the surface of the sandblasted aluminum material with a coating thickness of 4 μm, and cure it at 80° C. for 1 hour to obtain a high-strength wear-resistant aluminum material.

[0044] Comparative Example 1 (direct nitriding without laser cladding, the remaining method steps are the same as those in Example 1): S1: nitriding the base aluminum material; nitriding process: arc DC 90A, atmosphere is a mixture of nitrogen and argon, the gas flow rate of nitrogen is 8 L / min, the gas flow rate of argon is 4 L / min, and the tungsten electrode travel speed is 2.5 mm / s;

[0045] S2: Surface sandblasting of the nitrided aluminum material: The nitrided aluminum material is placed in a fixture of a sandblasting equipment. The sand grains used in the sandblasting equipment are 80 mesh white corundum. The air pressure of the sandblasting equipment is adjusted to 5 MPa, and the sandblasting is performed for 40 seconds.

[0046] S3: 20 parts of aluminum oxide, 25 parts of silicon oxide, 3 parts of silicon carbide, 10 parts of silicon nitride powder, and 10 parts of titanium carbide were respectively added to ethanol and ball-milled, and then placed in a planetary ball mill for 6 hours at a ball milling speed of 5000 rpm. The powders were taken out separately, dried at 120°C, and then calcined in a high-temperature furnace; among them, aluminum oxide and silicon oxide were calcined at 1200°C and kept warm for 2 hours, and silicon carbide, silicon nitride, and titanium carbide were calcined at 1500°C and kept warm for 3 hours. The calcined powders were ground again, sieved through 600 mesh, and mixed to obtain a wear-resistant filler;

[0047] S4: Mix 24 parts of γ-aminopropyltriethoxysilane, 4 parts of sodium hydroxide, 28 parts of 2-chloro-4,6-diphenyl-1,3,5-triazine, and 100 parts of toluene under nitrogen protection, stir and react at 25°C for 3 hours, and remove the solvent to obtain modified silane;

[0048] S5: dissolving 10 parts of tetraethoxysilane in 100 parts of isopropanol, adding 12 parts of water and 3 parts of ammonia water, heating the reaction at 55°C for 5 hours, adjusting the pH to 3, then adding 2 parts of γ-aminopropyltriethoxysilane, stirring at 60°C for 3 hours, adding 1 part of tridecafluorooctyltriethoxysilane and 4 parts of modified silane, and continuing to stir for 6 hours to obtain a nanosol; adding 20 wt% of fluorosilicone resin by weight of the nanosol, 20 wt% of wear-resistant filler by weight of the nanosol, and 2 wt% of γ-(2,3-epoxypropoxy)propyltrimethoxysilane by weight of the nanosol, and stirring for 2 hours to obtain a wear-resistant coating;

[0049] S7: Apply a wear-resistant coating to the surface of the sandblasted aluminum material with a coating thickness of 4 μm, and cure it at 80° C. for 1 hour to obtain a high-strength wear-resistant aluminum material.

[0050] Comparative Example 2 (no sandblasting, the remaining method steps are the same as Example 1): S1: A base aluminum material is taken and laser cladding is performed on the surface of the base aluminum material by mixing the powders to form a 0.1 mm titanium-nickel-silicon-tungsten layer; the mixed powder is titanium powder, nickel powder, silicon powder, and tungsten nitride powder in a mass ratio of 30:40:8:4, and the particle size is 200 mesh; the laser cladding is carried out in an argon protection chamber, using a coaxial powder feeding method, a laser power of 1600 W, a laser beam spot diameter of 2.5 mm, and a laser scanning speed of 7 mm / s;

[0051] S2: Nitriding the laser-clad aluminum material; Nitriding process: Arc DC 90A, atmosphere is a mixture of nitrogen and argon, nitrogen gas flow rate is 8L / min, argon gas flow rate is 4L / min, tungsten electrode travel speed is 2.5mm / s;

[0052] S3: 20 parts of aluminum oxide, 25 parts of silicon oxide, 3 parts of silicon carbide, 10 parts of silicon nitride, and 10 parts of titanium carbide were respectively added to ethanol for ball milling, and then placed in a planetary ball mill for ball milling for 6 hours at a ball milling speed of 5000 rpm. The powders were taken out separately, dried at 120°C, and then calcined in a high-temperature furnace; among them, aluminum oxide and silicon oxide were calcined at 1200°C and kept warm for 2 hours, and silicon carbide, silicon nitride, and titanium carbide were calcined at 1500°C and kept warm for 3 hours. The calcined powders were ground again, sieved through 600 mesh, and mixed to obtain a wear-resistant filler;

[0053] S4: Mix 24 parts of γ-aminopropyltriethoxysilane, 4 parts of sodium hydroxide, 28 parts of 2-chloro-4,6-diphenyl-1,3,5-triazine, and 100 parts of toluene under nitrogen protection, stir and react at 25°C for 3 hours, and remove the solvent to obtain modified silane;

[0054] S5: dissolving 10 parts of tetraethoxysilane in 100 parts of isopropanol, adding 12 parts of water and 3 parts of ammonia water, heating the reaction at 55°C for 5 hours, adjusting the pH to 3, then adding 2 parts of γ-aminopropyltriethoxysilane, stirring at 60°C for 3 hours, adding 1 part of tridecafluorooctyltriethoxysilane and 4 parts of modified silane, and continuing to stir for 6 hours to obtain a nanosol; adding 20 wt% of fluorosilicone resin by weight of the nanosol, 20 wt% of wear-resistant filler by weight of the nanosol, and 2 wt% of γ-(2,3-epoxypropoxy)propyltrimethoxysilane by weight of the nanosol, and stirring for 2 hours to obtain a wear-resistant coating;

[0055] S6: coating a wear-resistant coating on the surface of the sandblasted aluminum material with a coating thickness of 4 μm and curing at 80° C. for 1 hour to obtain a high-strength wear-resistant aluminum material.

[0056] Comparative Example 3 (tridecafluorooctyltriethoxysilane was used instead of modified silane, and the remaining method steps were consistent with Example 1): S1: A base aluminum material was taken and laser clad by mixed powder to form a 0.1 mm titanium-nickel-silicon-tungsten layer on its surface; the mixed powder consisted of titanium powder, nickel powder, silicon powder, and tungsten nitride powder in a mass ratio of 30:40:8:4, and the particle size was 200 mesh; the laser cladding was carried out in an argon protection chamber, using coaxial powder feeding, a laser power of 1600 W, a laser beam spot diameter of 2.5 mm, and a laser scanning speed of 7 mm / s;

[0057] S2: Nitriding the laser-clad aluminum material; Nitriding process: Arc DC 90A, atmosphere is a mixture of nitrogen and argon, nitrogen gas flow rate is 8L / min, argon gas flow rate is 4L / min, tungsten electrode travel speed is 2.5mm / s;

[0058] S3: Surface sandblasting of the nitrided aluminum material: The nitrided aluminum material is placed in a fixture of a sandblasting device. The sand grains used in the sandblasting device are 80 mesh white corundum. The air pressure of the sandblasting device is adjusted to 5 MPa, and the sandblasting is performed for 40 seconds.

[0059] S4: 20 parts of aluminum oxide, 25 parts of silicon oxide, 3 parts of silicon carbide, 10 parts of silicon nitride, and 10 parts of titanium carbide are respectively added to ethanol for ball milling, and then placed in a planetary ball mill for ball milling for 6 hours at a ball milling speed of 5000 rpm. The powders are taken out separately, dried at 120°C, and then calcined in a high-temperature furnace after drying; wherein, aluminum oxide and silicon oxide are calcined at 1200°C and kept warm for 2 hours, and silicon carbide, silicon nitride, and titanium carbide are calcined at 1500°C and kept warm for 3 hours. The calcined powders are ground again, sieved through 600 mesh, and then mixed to obtain a wear-resistant filler;

[0060] S5: dissolving 10 parts of tetraethoxysilane in 100 parts of isopropanol, adding 12 parts of water and 3 parts of ammonia water, heating the reaction at 55°C for 5 hours, adjusting the pH to 3, then adding 2 parts of γ-aminopropyltriethoxysilane, stirring at 60°C for 3 hours, adding 5 parts of tridecafluorooctyltriethoxysilane, and continuing to stir for 6 hours to obtain a nanosol; adding 20 wt% of fluorosilicone resin by weight of the nanosol, 20 wt% of wear-resistant filler by weight of the nanosol, and 2 wt% of γ-(2,3-epoxypropoxy)propyltrimethoxysilane by weight of the nanosol, stirring for 2 hours to obtain a wear-resistant coating;

[0061] S6: coating a wear-resistant coating on the surface of the sandblasted aluminum material with a coating thickness of 4 μm and curing at 80° C. for 1 hour to obtain a high-strength wear-resistant aluminum material.

[0062] Comparative Example 4 (changing the ratio of the mixed powder, the remaining method steps are consistent with Example 1): S1: Taking a base aluminum material, laser cladding is performed on the mixed powder to form a 0.1 mm titanium-nickel-silicon-tungsten layer on its surface; the mixed powder is titanium powder, nickel powder, silicon powder, and tungsten nitride powder in a mass ratio of 40:10:18:14, and the particle size is 200 mesh; the laser cladding is carried out in an argon protection chamber, using a coaxial powder feeding method, the laser power is 1600 W, the laser beam spot diameter is 2.5 mm, and the laser scanning speed is 7 mm / s;

[0063] S2: Nitriding the laser-clad aluminum material; Nitriding process: Arc DC 90A, atmosphere is a mixture of nitrogen and argon, nitrogen gas flow rate is 8L / min, argon gas flow rate is 4L / min, tungsten electrode travel speed is 2.5mm / s;

[0064] S3: Surface sandblasting of the nitrided aluminum material: The nitrided aluminum material is placed in a fixture of a sandblasting device. The sand grains used in the sandblasting device are 80 mesh white corundum. The air pressure of the sandblasting device is adjusted to 5 MPa, and the sandblasting is performed for 40 seconds.

[0065] S4: 20 parts of aluminum oxide, 25 parts of silicon oxide, 3 parts of silicon carbide, 10 parts of silicon nitride, and 10 parts of titanium carbide are respectively added to ethanol for ball milling, and then placed in a planetary ball mill for ball milling for 6 hours at a ball milling speed of 5000 rpm. The powders are taken out separately, dried at 120°C, and then calcined in a high-temperature furnace after drying; wherein, aluminum oxide and silicon oxide are calcined at 1200°C and kept warm for 2 hours, and silicon carbide, silicon nitride, and titanium carbide are calcined at 1500°C and kept warm for 3 hours. The calcined powders are ground again, sieved through 600 mesh, and then mixed to obtain a wear-resistant filler;

[0066] S5: Mix 24 parts of γ-aminopropyltriethoxysilane, 4 parts of sodium hydroxide, 28 parts of 2-chloro-4,6-diphenyl-1,3,5-triazine, and 100 parts of toluene under nitrogen protection, stir at 25°C for 3 hours, and remove the solvent to obtain modified silane;

[0067] S6: dissolving 10 parts of tetraethoxysilane in 100 parts of isopropanol, adding 12 parts of water and 3 parts of ammonia water, heating the reaction at 55°C for 5 hours, adjusting the pH to 3, then adding 2 parts of γ-aminopropyltriethoxysilane, stirring at 60°C for 3 hours, adding 1 part of tridecafluorooctyltriethoxysilane and 4 parts of modified silane, and continuing to stir for 6 hours to obtain a nanosol; adding 20 wt% of fluorosilicone resin by weight of the nanosol, 20 wt% of wear-resistant filler by weight of the nanosol, and 2 wt% of γ-(2,3-epoxypropoxy)propyltrimethoxysilane by weight of the nanosol, and stirring for 2 hours to obtain a wear-resistant coating;

[0068] S7: Apply a wear-resistant coating to the surface of the sandblasted aluminum material with a coating thickness of 4 μm, and cure it at 80° C. for 1 hour to obtain a high-strength wear-resistant aluminum material.

[0069] Performance test: The high-strength wear-resistant aluminum materials prepared in Examples 1 to 3 and Comparative Examples 1 to 4 were tested for hardness using (1) a HV-1000 microhardness tester. (2) The tensile strength was tested using an INSPEK-Table100 electronic universal tensile testing machine in accordance with GB / T 228.1-2010 at a tensile rate of 3 mm / min. See Table 1 for details.

[0070] Table 1:

[0071]

[0072] Conclusion: Comparative Example 1 does not perform laser cladding and directly nitriding, because there is no base layer, the performance is significantly reduced; Comparative Example 2 does not perform sandblasting, which leads to a decrease in the mechanical properties of the metal matrix and a decrease in the adhesion of the coating; Comparative Example 3 replaces the modified silane with tridecafluorooctyltriethoxysilane, and the performance is reduced, which shows the promoting effect of the introduction of modified silane in this scheme; Comparative Example 4 changes the proportion of the mixed powder, and due to the change in the base layer structure, the performance is not as good as the embodiment; It can be seen that the high-strength wear-resistant aluminum material prepared by the present invention has good surface hardness and tensile strength.

[0073] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A method for preparing high-strength wear-resistant aluminum material for rolling shutter doors, characterized by: The following steps are involved: S1: Take the base aluminum material and perform laser cladding on the surface of the base aluminum material by mixing the powders to form a 0.1-0.2 mm titanium-nickel-silicon-tungsten layer; S2: performing nitriding treatment on the laser-clad aluminum material obtained in step S1; S3: performing surface sandblasting on the nitrided aluminum material obtained in step S2; S4: coating the surface of the aluminum material obtained by sandblasting in step S3 with a wear-resistant coating having a coating thickness of 3 to 5 μm, and curing and drying to obtain a high-strength wear-resistant aluminum material.

2. The method for preparing a high-strength wear-resistant aluminum material for a rolling door according to claim 1, characterized in that: The mixed powder comprises titanium powder, nickel powder, silicon powder and tungsten nitride powder in a mass ratio of (30-40): (30-40): (5-10): (1-5).

3. The method for preparing a high-strength wear-resistant aluminum material for a rolling door according to claim 1, characterized in that: Laser cladding is carried out in an argon protection chamber, using a coaxial powder feeding method, with a laser power of 1500-1600W, a laser beam spot diameter of 2-3mm, and a laser scanning speed of 5-10mm / s.

4. The method for preparing a high-strength wear-resistant aluminum material for a rolling door according to claim 1, characterized in that: Nitriding process: arc DC 90~120A, atmosphere is a mixture of nitrogen and argon, nitrogen gas flow rate is 7~10L / min, argon gas flow rate is 0~5L / min, tungsten electrode travel speed is 2.5~3.0mm / s.

5. The method for preparing a high-strength wear-resistant aluminum material for a rolling door according to claim 1, characterized in that: Sandblasting process: Place the nitrided aluminum material in the jig of the sandblasting equipment. The sand particles used in the sandblasting equipment are 60-100 mesh white corundum. The air pressure of the sandblasting equipment is adjusted to 3-6 MPa for sandblasting. The sandblasting time is 30-60 seconds.

6. The method for preparing a high-strength wear-resistant aluminum material for a rolling door according to claim 1, characterized in that: The basic aluminum material includes the following components, calculated by mass percentage: Zn: 0.02-0.05%, Mg: 2.0-2.5%, Cu: 0.5-1.0%, Mn: 0.01-0.02%, Si: 0.04-0.05%, Fe: 0.1-0.2%, Ti: 0.001-0.005%, and the balance is Al and unavoidable impurities.

7. The method for preparing a high-strength wear-resistant aluminum material for a rolling door according to claim 1, characterized in that: The preparation of the wear-resistant coating comprises the following steps: Step 1: ball-milling, drying, calcining, grinding, sieving, and mixing aluminum oxide, silicon oxide, silicon carbide, silicon nitride, and titanium carbide to obtain a wear-resistant filler; Step 2: Mix γ-aminopropyltriethoxysilane, sodium hydroxide, 2-chloro-4,6-diphenyl-1,3,5-triazine, and toluene under nitrogen protection, stir and react at 20-30° C. for 2-3 hours, and remove the solvent to obtain modified silane; Step 3: Dissolve tetraethoxysilane in isopropanol, add water and ammonia water, stir at 50-60°C for 4-5 hours, adjust the pH to 3-4, add γ-aminopropyltriethoxysilane, stir at 50-60°C for 3-4 hours, add tridecafluorooctyltriethoxysilane and modified silane, continue stirring for 5-6 hours to obtain nanosol; add fluorosilicone resin, wear-resistant filler, γ-(2,3-epoxypropoxy)propyltrimethoxysilane, stir for 1-2 hours to obtain wear-resistant coating.

8. The method for preparing a high-strength wear-resistant aluminum material for a rolling door according to claim 7, characterized in that: The wear-resistant filler comprises the following raw materials, calculated by mass: 20 to 25 parts of aluminum oxide, 25 to 30 parts of silicon oxide, 3 to 5 parts of silicon carbide, 10 to 15 parts of silicon nitride, and 10 to 15 parts of titanium carbide; The modified silane comprises the following raw materials, calculated by mass: 20 to 25 parts of γ-aminopropyltriethoxysilane, 3 to 5 parts of sodium hydroxide, 25 to 30 parts of 2-chloro-4,6-diphenyl-1,3,5-triazine, and 100 to 150 parts of toluene; The nanosol comprises the following raw materials, calculated by mass: 10-15 parts of tetraethoxysilane, 100-150 parts of isopropyl alcohol, 10-15 parts of water, 3-5 parts of ammonia water, 2-3 parts of γ-aminopropyltriethoxysilane, 1-2 parts of tridecafluorooctyltriethoxysilane, and 3-4 parts of modified silane; The added amount of fluorosilicone resin is 15-25% of the mass of nanosol; the added amount of wear-resistant filler is 15-25% of the mass of nanosol; and the added amount of gamma-(2,3-epoxypropoxy)propyltrimethoxysilane is 1-2% of the mass of nanosol.

9. A high-strength wear-resistant aluminum material prepared according to the method for preparing a high-strength wear-resistant aluminum material for a rolling shutter door according to any one of claims 1 to 8.

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