Steel door and window based on wear-resistant coating and preparation method of steel door and window

Abstract

The invention relates to the technical field of wear-resistant materials, in particular to a steel door and window based on a wear-resistant coating and a preparation method of the steel door and window. The high-wear-resistance metal powder is obtained by mixing T400 alloy powder and cobalt-coated silicon carbide powder and carrying out mechanical ball milling. Then high-wear-resistance metal powder is laid on the surface of the steel, and pretreated steel is obtained through laser cladding; and coating the surface of the pretreated steel with the silicon-modified wear-resistant coating, and cooling and curing to obtain a finished product. The finished product prepared by the invention has excellent wear resistance and corrosion resistance, so that the wear-resistant material has a wide application prospect in the technical field of wear-resistant materials.

Description

Technical Field

[0001] The invention relates to the technical field of wear-resistant materials, in particular to a steel door and window based on a wear-resistant coating and a preparation method thereof. Background Art

[0002] In modern architecture, steel's exceptional performance has shaped countless iconic buildings. Steel doors and windows, as a prime example of steel's application, demonstrate its multifaceted modern value. Steel doors and windows are sturdy and durable, offering resistance to external forces, providing reliable security against theft, vandalism, or natural disasters. Their excellent fire resistance effectively prevents the spread of fire, buying time for evacuation and property protection. Furthermore, modern architecture strives for a unique appearance and sense of space. The slender frames of steel doors and windows allow for large expanses of glazing, enhancing the sense of visual transparency between interior and exterior, creating an open and bright atmosphere. Their clean lines complement the minimalist style of modern architecture, blending seamlessly with styles ranging from industrial to minimalist to modernist, enhancing the overall aesthetic and artistic value of the building. However, in daily use, surrounding objects and the opening and closing of doors and windows can easily cause friction with steel doors and windows, compromising their visual integrity and structural stability. Therefore, there is an urgent need to improve the wear resistance of steel. In addition, as external facilities, steel doors and windows are easily corroded by rain, humid air, chemicals, etc., which greatly reduces the service life of steel doors and windows. Therefore, it is necessary to improve the hydrophobicity and corrosion resistance of steel to prevent steel from rusting and corroding, greatly extending the service life of steel doors and windows and reducing replacement costs.

[0003] In order to overcome the defects of the prior art, the present invention provides a steel door and window based on a wear-resistant coating and a preparation method thereof. Summary of the Invention

[0004] The object of the present invention is to provide a steel door and window based on a wear-resistant coating and a preparation method thereof, so as to solve the problems raised in the prior art.

[0005] To achieve the above object, the present invention provides the following technical solutions: A method for preparing steel doors and windows based on wear-resistant coatings comprises the following steps: mixing T400 alloy powder and cobalt-coated silicon carbide powder, and subjecting the mixture to mechanical ball milling for 20-30 minutes to obtain highly wear-resistant metal powder; applying the highly wear-resistant metal powder to the surface of steel, and subjecting the mixture to laser cladding to obtain pretreated steel; and applying a silicon-modified wear-resistant coating to the surface of the pretreated steel, and cooling and curing the mixture to obtain a finished product.

[0006] More optimally, the mixing ratio of T400 alloy powder and cobalt-coated silicon carbide powder is 9:(1.0-1.5); the laying thickness of high-wear-resistant metal powder is 1.0-1.1mm; laser cladding parameters: power is 1.5-1.7KW, laser spot diameter is 6-8mm, laser scanning speed is 10-12mm / s; the coating thickness of silicon-modified wear-resistant coating is 100-120μm.

[0007] More optimally, the preparation process of cobalt-coated silicon carbide powder is: Step S1: adding silicon carbide powder to a 2.3-2.5 mol / L hydrochloric acid solution, stirring with ultrasound at 25-30° C. for 2.5-3.0 hours, centrifuging, washing, and drying after the stirring to obtain pretreated silicon carbide powder; Step S2: adding the pretreated silicon carbide powder to a mixed solution of isopropyl alcohol and deionized water, then adding 23-25 ​​wt% ammonia water, ultrasonically dispersing at 25-30° C. for 20-25 min, then slowly adding tetraethyl orthosilicate dropwise, reacting at 55-60° C. for 15-18 h after the addition, washing with water, washing with alcohol, and drying to obtain silicon-coated silicon carbide powder; Step S3: mixing silicon-coated silicon carbide powder and metal cobalt powder, and keeping the mixture at 800-850° C. for 15-18 minutes. After the heat preservation, naturally cooling, washing, and drying are performed to obtain cobalt-coated silicon carbide powder.

[0008] More optimally, in step S2, the volume ratio of isopropyl alcohol and deionized water in the mixed solution is 8:(2-3); the reaction mass ratio of pretreated silicon carbide powder, ammonia water, and tetraethyl orthosilicate is 0.5:(3.8-4.0):(4.0-4.5).

[0009] More optimally, in step S3, the mixing ratio of the silicon-coated silicon carbide powder and the metallic cobalt powder is 1:(0.6-0.8).

[0010] More optimally, the preparation process of silicon-modified wear-resistant coating is: Step S1: adding carbon nanotubes to a mixed solution of isopropanol and deionized water, then adding 23-25wt% ammonia water, ultrasonically dispersing at 25-30°C for 10-12 minutes, then slowly adding tetraethyl orthosilicate dropwise, reacting at 55-60°C for 10-12 hours after the addition is completed, washing with water, washing with alcohol, and drying to obtain silicon-coated carbon nanotubes; adding potassium titanate whiskers to a mixed solution of isopropanol and deionized water, then adding 23-25wt% ammonia water, ultrasonically dispersing at 25-30°C for 15-18 minutes, then slowly adding tetraethyl orthosilicate dropwise, reacting at 55-60°C for 14-16 hours after the addition is completed, washing with water, washing with alcohol, and drying to obtain silicon-coated potassium titanate whiskers; Step S2: adding silicon-coated potassium titanate whiskers and dopamine hydrochloride to a Tris buffer solution, stirring for 10-15 minutes, then adding silicon-coated carbon nanotubes, and continuing to stir for 20-25 hours. After the stirring is completed, centrifugation, washing, adjusting the pH to neutral, and freeze-drying are performed to obtain a wear-resistant filler; Step S3: Under a nitrogen environment, perfluorodecyltriethoxysilane and γ-glycidyloxypropyltrimethoxysilane are mixed, stirred continuously and heated to 65-70°C, and then a mixed solution of 0.8-1.0 mol / L hydrochloric acid and deionized water is added dropwise. After the addition is completed, the reaction is continued for 3-4 hours to obtain a hydrophobic epoxy silicone; then, epoxy resin, wear-resistant filler, and dispersant are added to the hydrophobic epoxy silicone, heated and stirred at 100-110°C for 1.5-2.0 hours, and then a curing agent is added to obtain a silicon-modified wear-resistant coating.

[0011] More optimally, in step S1, the volume ratio of isopropyl alcohol and deionized water in the mixed solution is 8:(2-3); the reaction mass ratio of carbon nanotubes, ammonia water, and tetraethyl orthosilicate is 0.5:(3.2-3.5):(3.5-4.0); and the reaction mass ratio of potassium titanate whiskers, ammonia water, and tetraethyl orthosilicate is 0.5:(3.2-3.5):(3.5-4.0).

[0012] More optimally, in step S2, the pH of the Tris buffer solution is 8.5-8.7, and the concentration of the solute tris(hydroxymethyl)aminomethane is 10-13 mmol / L; wherein the concentrations of the silicon-coated potassium titanate whiskers, dopamine hydrochloride, and silicon-coated carbon nanotubes in the reaction solution are all 2.5-2.7 g / L.

[0013] More optimally, in step S3, the mass volume ratio of perfluorodecyltriethoxysilane, γ-glycidyloxypropyltrimethoxysilane, deionized water, and hydrochloric acid is (1.3-1.5) g: 1 g: (1.0-1.2) mL: (0.1-0.2) mL; the content of each component of the silicon-modified wear-resistant coating is: in parts by mass, 15-20 parts of hydrophobic epoxy silicone, 30-40 parts of epoxy resin, 10-12 parts of wear-resistant filler, 0.8-1.0 parts of dispersant, and 10-15 parts of curing agent.

[0014] Beneficial effects of the present invention: The present invention is characterized in that silicon carbide powder is first pretreated with hydrochloric acid to obtain surface-activated pretreated silicon carbide powder. The pretreated silicon carbide powder, ammonia water, and ethyl orthosilicate are then mixed and reacted to obtain silicon carbide powder uniformly coated with silicon dioxide, i.e., silicon-coated silicon carbide powder. The silicon-coated silicon carbide powder is then mixed with metallic cobalt powder and subjected to a high-temperature, heat-insulated reaction to obtain a metallized ceramic powder, i.e., cobalt-coated silicon carbide powder. T400 alloy powder and the cobalt-coated silicon carbide powder are then mixed and mechanically ball-milled to obtain a highly wear-resistant metal powder. The highly wear-resistant metal powder is then applied to the surface of steel and laser-clad to obtain pretreated steel. In this step, by coating the surface of the silicon carbide powder with silicon dioxide, on the one hand, the agglomeration of the silicon carbide powder is improved and its dispersibility is enhanced; on the other hand, the silicon dioxide component introduced in this step is similar to the silicon dioxide component in the silicon-modified wear-resistant coating, and both have good wear resistance. Therefore, in the subsequent preparation of high-wear-resistant metal powder and laser cladding to form pretreated steel, it can better cooperate with the silicon-modified wear-resistant coating to further enhance the overall wear resistance of the coating. In addition, by further introducing metallic cobalt on the surface of the silicon-coated silicon carbide powder, the interfacial bonding between the silicon-coated silicon carbide powder and the T400 alloy powder (cobalt-based alloy) can be effectively improved, promoting the diffusion of elements and interfacial reactions, enhancing the bonding strength of the interface, and also enabling the formation of a denser, defect-free coating structure during the laser cladding process, greatly improving the comprehensive performance of the pretreated steel, such as hardness, toughness and wear resistance.

[0015] The present invention is characterized in that carbon nanotubes, ammonia and tetraethyl orthosilicate are mixed and reacted to obtain carbon nanotubes uniformly coated with silicon dioxide, i.e., silicon-coated carbon nanotubes. Potassium titanate whiskers, ammonia and tetraethyl orthosilicate are mixed and reacted to obtain potassium titanate whiskers uniformly coated with silicon dioxide, i.e., silicon-coated potassium titanate whiskers. Utilizing the crosslinking and adhesion of polydopamine, two fillers with excellent wear resistance, silicon-coated carbon nanotubes and silicon-coated potassium titanate whiskers, are uniformly assembled to obtain wear-resistant fillers. Silicon-coated carbon nanotubes have excellent strength and toughness, while silicon-coated potassium titanate whiskers have good rigidity and wear resistance. Therefore, they are uniformly assembled by the crosslinking and adhesion of polydopamine, which enables the two fillers to better exert a synergistic effect in epoxy resin. In addition, the two fillers are uniformly mixed into a wear-resistant filler by polydopamine in advance, and when added to epoxy resin, the processing process can be simplified. Compared to adding two fillers separately, this pre-mixing method can reduce stirring time and energy consumption and improve reaction efficiency.

[0016] The present invention is characterized by using perfluorodecyltriethoxysilane and γ-glycidyloxypropyltrimethoxysilane as main raw materials, which are fully hydrolyzed to produce a hydrophobic epoxy silicone. An epoxy resin, a wear-resistant filler, and a dispersant are then added to the hydrophobic epoxy silicone. After heating and stirring, a curing agent is added to produce a silicon-modified wear-resistant coating. The silicon-modified wear-resistant coating is applied to the surface of pretreated steel and cooled and solidified to produce a finished product. The perfluorodecyltriethoxysilane contains a large amount of fluorine, which effectively enhances the hydrophobic and corrosion-resistant properties of the silicon-modified wear-resistant coating. The γ-glycidyloxypropyltrimethoxysilane contains functional epoxy groups, so the prepared hydrophobic epoxy silicone has good compatibility with the main epoxy resin. Furthermore, the surface of the wear-resistant filler is also coated with a large amount of silica, which is similarly compatible with the hydrophobic epoxy silicone component. Therefore, the overall performance of the silicon-modified wear-resistant coating is uniform and consistent, with excellent wear and corrosion resistance. Therefore, it has broad application prospects in the field of wear-resistant materials technology. DETAILED DESCRIPTION

[0017] 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.

[0018] Source of raw materials: The steel material is Q235 steel; the carbon nanotubes are provided by Qinghe County Ruijiang Metal Materials Co., Ltd., with a tube diameter of 1.5 nm; the potassium titanate whiskers are provided by Hubei Yamade Biomedicine Co., Ltd., with a diameter of 0.3 μm; the epoxy resin is provided by Jinan Zesheng Chemical Co., Ltd., model E51; the T400 alloy powder is provided by Qinghe County Diangu Welding Materials Co., Ltd., with a specification of 300 mesh; the dispersant is dispersant 5040; the curing agent is polyamide 651; in terms of mass, one part is 1 g.

[0019] Example 1: Step S1: adding silicon carbide powder to a 2.4 mol / L hydrochloric acid solution, stirring at 30° C. for 3.0 h, centrifuging, washing, and drying to obtain pretreated silicon carbide powder; Step S2: adding the pretreated silicon carbide powder to a mixed solution of isopropanol and deionized water, then adding 24 wt% ammonia water, ultrasonically dispersing at 30°C for 25 minutes, then slowly adding tetraethyl orthosilicate dropwise, reacting at 60°C for 18 hours after the addition is completed, washing with water, washing with alcohol, and drying to obtain silicon-coated silicon carbide powder; the volume ratio of isopropanol to deionized water in the mixed solution is 8:2.5; the reaction mass ratio of the pretreated silicon carbide powder, ammonia water, and tetraethyl orthosilicate is 0.5:3.9:4.2; Step S3: mixing silicon-coated silicon carbide powder and metal cobalt powder, maintaining the mixture at 850° C. for 18 minutes, and then naturally cooling, washing, and drying the mixture to obtain cobalt-coated silicon carbide powder; the mixing ratio of the silicon-coated silicon carbide powder to the metal cobalt powder is 1:0.7; Step S4: adding carbon nanotubes to a mixed solution of isopropanol and deionized water, then adding 24wt% ammonia water, ultrasonically dispersing at 30°C for 12 minutes, then slowly adding ethyl orthosilicate dropwise, reacting at 60°C for 12 hours after the addition is completed, washing with water, washing with alcohol, and drying to obtain silicon-coated carbon nanotubes; adding potassium titanate whiskers to a mixed solution of isopropanol and deionized water, then adding 24wt% ammonia water, ultrasonically dispersing at 30°C for 18 minutes, then slowly adding ethyl orthosilicate dropwise, reacting at 60°C for 16 hours after the addition is completed, washing with water, washing with alcohol, and drying to obtain silicon-coated potassium titanate whiskers; the volume ratio of isopropanol to deionized water in the mixed solution is 8:2.5; the reaction mass ratio of carbon nanotubes, ammonia water, and ethyl orthosilicate is 0.5:3.4:3.7; the reaction mass ratio of potassium titanate whiskers, ammonia water, and ethyl orthosilicate is 0.5:3.4:3.7; Step S5: adding silicon-coated potassium titanate whiskers and dopamine hydrochloride to a Tris buffer solution, stirring for 15 minutes, then adding silicon-coated carbon nanotubes, and continuing to stir for 25 hours. After the stirring is completed, the solution is centrifuged, washed, adjusted to a neutral pH, and freeze-dried to obtain a wear-resistant filler; the pH of the Tris buffer solution is 8.7, and the concentration of the solute tris(hydroxymethyl)aminomethane is 12 mmol / L; wherein the concentrations of the silicon-coated potassium titanate whiskers, dopamine hydrochloride, and silicon-coated carbon nanotubes in the reaction solution are all 2.6 g / L; Step S6: Under a nitrogen environment, perfluorodecyl triethoxysilane and γ-glycidyloxypropyl trimethoxysilane were mixed, stirred continuously and heated to 70°C, and then a mixed solution of 1 mol / L hydrochloric acid and deionized water was added dropwise. After the addition was completed, the reaction was continued for 4 hours to obtain a hydrophobic epoxy silicone; then 40g of epoxy resin, 12g of wear-resistant filler, and 1g of dispersant 5040 were added to 20g of the hydrophobic epoxy silicone, heated and stirred at 110°C for 2.0h, and then 15g of polyamide 651 was added to obtain a silicon-modified wear-resistant coating; the mass volume ratio of perfluorodecyl triethoxysilane, γ-glycidyloxypropyl trimethoxysilane, deionized water, and hydrochloric acid was 1.4g:1g:1.1mL:0.15mL; Step S7: Mix T400 alloy powder and cobalt-coated silicon carbide powder, and mechanically ball mill for 30 minutes to obtain high-wear-resistant metal powder; lay the high-wear-resistant metal powder on the surface of the steel, and obtain pretreated steel by laser cladding; apply the silicon-modified wear-resistant coating to the surface of the pretreated steel, and obtain the finished product after cooling and solidification; the mixing ratio of T400 alloy powder and cobalt-coated silicon carbide powder is 9:1.2; the laying thickness of the high-wear-resistant metal powder is 1 mm; laser cladding parameters: power is 1.7 kW, laser spot diameter is 8 mm, and laser scanning speed is 12 mm / s; the coating thickness of the silicon-modified wear-resistant coating is 100 μm.

[0020] Example 2: Step S1: adding silicon carbide powder to a 2.4 mol / L hydrochloric acid solution, stirring at 27°C for 2.7 hours, centrifuging, washing, and drying to obtain pretreated silicon carbide powder; Step S2: adding the pretreated silicon carbide powder to a mixed solution of isopropanol and deionized water, then adding 24 wt% ammonia water, ultrasonically dispersing at 27° C. for 23 minutes, then slowly adding tetraethyl orthosilicate dropwise, reacting at 57° C. for 16 hours after the addition is completed, washing with water, washing with alcohol, and drying to obtain silicon-coated silicon carbide powder; the volume ratio of isopropanol to deionized water in the mixed solution is 8:2.5; the reaction mass ratio of the pretreated silicon carbide powder, ammonia water, and tetraethyl orthosilicate is 0.5:3.9:4.2; Step S3: mixing silicon-coated silicon carbide powder and metallic cobalt powder, maintaining the mixture at 825° C. for 17 minutes, and then naturally cooling, washing, and drying the mixture to obtain cobalt-coated silicon carbide powder; the mixing ratio of the silicon-coated silicon carbide powder to the metallic cobalt powder is 1:0.7; Step S4: adding carbon nanotubes to a mixed solution of isopropanol and deionized water, then adding 24wt% ammonia water, ultrasonically dispersing at 27°C for 11 minutes, then slowly adding tetraethyl orthosilicate dropwise, reacting at 57°C for 11 hours after the addition is completed, washing with water, washing with alcohol, and drying to obtain silicon-coated carbon nanotubes; adding potassium titanate whiskers to a mixed solution of isopropanol and deionized water, then adding 24wt% ammonia water, ultrasonically dispersing at 27°C for 17 minutes, then slowly adding tetraethyl orthosilicate dropwise, reacting at 57°C for 15 hours after the addition is completed, washing with water, washing with alcohol, and drying to obtain silicon-coated potassium titanate whiskers; the volume ratio of isopropanol to deionized water in the mixed solution is 8:2.5; the reaction mass ratio of carbon nanotubes, ammonia water, and tetraethyl orthosilicate is 0.5:3.4:3.7; the reaction mass ratio of potassium titanate whiskers, ammonia water, and tetraethyl orthosilicate is 0.5:3.4:3.7; Step S5: adding silicon-coated potassium titanate whiskers and dopamine hydrochloride to a Tris buffer solution, stirring for 12 minutes, then adding silicon-coated carbon nanotubes, and continuing to stir for 23 hours. After the stirring is completed, the solution is centrifuged, washed, adjusted to a neutral pH, and freeze-dried to obtain a wear-resistant filler; the pH of the Tris buffer solution is 8.6, and the concentration of the solute tris(hydroxymethyl)aminomethane is 12 mmol / L; wherein the concentrations of the silicon-coated potassium titanate whiskers, dopamine hydrochloride, and silicon-coated carbon nanotubes in the reaction solution are all 2.6 g / L; Step S6: Under a nitrogen environment, perfluorodecyl triethoxysilane and γ-glycidyloxypropyl trimethoxysilane were mixed, stirred continuously and heated to 67°C, and then a mixed solution of 1 mol / L hydrochloric acid and deionized water was added dropwise. After the addition was completed, the reaction was continued for 3.5 hours to obtain a hydrophobic epoxy silicone; then 40g of epoxy resin, 12g of wear-resistant filler, and 1g of dispersant 5040 were added to 20g of the hydrophobic epoxy silicone, heated and stirred at 105°C for 1.7h, and then 15g of polyamide 651 was added to obtain a silicon-modified wear-resistant coating; the mass volume ratio of perfluorodecyl triethoxysilane, γ-glycidyloxypropyl trimethoxysilane, deionized water, and hydrochloric acid was 1.4g:1g:1.1mL:0.15mL; Step S7: T400 alloy powder and cobalt-coated silicon carbide powder are mixed, and mechanically ball milled for 25 minutes to obtain high-wear-resistant metal powder; the high-wear-resistant metal powder is laid on the surface of the steel, and laser cladding is performed to obtain pretreated steel; the silicon-modified wear-resistant coating is applied to the surface of the pretreated steel, and after cooling and solidification, a finished product is obtained; the mixing ratio of T400 alloy powder and cobalt-coated silicon carbide powder is 9:1.2; the laying thickness of the high-wear-resistant metal powder is 1 mm; laser cladding parameters: power is 1.6 kW, laser spot diameter is 7 mm, laser scanning speed is 11 mm / s, and the coating thickness of the silicon-modified wear-resistant coating is 100 μm.

[0021] Example 3: Step S1: adding silicon carbide powder to a 2.4 mol / L hydrochloric acid solution, stirring with ultrasound at 25°C for 2.5 hours, centrifuging, washing, and drying to obtain pretreated silicon carbide powder; Step S2: adding the pretreated silicon carbide powder to a mixed solution of isopropanol and deionized water, then adding 24 wt% ammonia water, ultrasonically dispersing at 25° C. for 20 minutes, then slowly adding tetraethyl orthosilicate dropwise, reacting at 55° C. for 15 hours after the addition is completed, washing with water, washing with alcohol, and drying to obtain silicon-coated silicon carbide powder; the volume ratio of isopropanol to deionized water in the mixed solution is 8:2.5; the reaction mass ratio of the pretreated silicon carbide powder, ammonia water, and tetraethyl orthosilicate is 0.5:3.9:4.2; Step S3: mixing silicon-coated silicon carbide powder and metallic cobalt powder, maintaining the mixture at 800° C. for 15 minutes, and then naturally cooling, washing, and drying the mixture to obtain cobalt-coated silicon carbide powder; the mixing ratio of the silicon-coated silicon carbide powder to the metallic cobalt powder is 1:0.7; Step S4: adding carbon nanotubes to a mixed solution of isopropanol and deionized water, then adding 24wt% ammonia water, ultrasonically dispersing at 25°C for 10 minutes, then slowly adding ethyl orthosilicate dropwise, reacting at 55°C for 10 hours after the addition is completed, washing with water, washing with alcohol, and drying to obtain silicon-coated carbon nanotubes; adding potassium titanate whiskers to a mixed solution of isopropanol and deionized water, then adding 24wt% ammonia water, ultrasonically dispersing at 25°C for 15 minutes, then slowly adding ethyl orthosilicate dropwise, reacting at 55°C for 14 hours after the addition is completed, washing with water, washing with alcohol, and drying to obtain silicon-coated potassium titanate whiskers; the volume ratio of isopropanol to deionized water in the mixed solution is 8:2.5; the reaction mass ratio of carbon nanotubes, ammonia water, and ethyl orthosilicate is 0.5:3.4:3.7; the reaction mass ratio of potassium titanate whiskers, ammonia water, and ethyl orthosilicate is 0.5:3.4:3.7; Step S5: adding silicon-coated potassium titanate whiskers and dopamine hydrochloride to a Tris buffer solution, stirring for 10 minutes, then adding silicon-coated carbon nanotubes, and continuing to stir for 20 hours. After the stirring is completed, the solution is centrifuged, washed, adjusted to a neutral pH, and freeze-dried to obtain a wear-resistant filler; the pH of the Tris buffer solution is 8.5, and the concentration of the solute tris(hydroxymethyl)aminomethane is 12 mmol / L; wherein the concentrations of the silicon-coated potassium titanate whiskers, dopamine hydrochloride, and silicon-coated carbon nanotubes in the reaction solution are all 2.6 g / L; Step S6: Under a nitrogen environment, perfluorodecyl triethoxysilane and γ-glycidyloxypropyl trimethoxysilane were mixed, stirred continuously and heated to 65°C, and then a mixed solution of 1 mol / L hydrochloric acid and deionized water was added dropwise. After the addition was completed, the reaction was continued for 3 hours to obtain a hydrophobic epoxy silicone; then 40g of epoxy resin, 12g of wear-resistant filler, and 1g of dispersant 5040 were added to 20g of the hydrophobic epoxy silicone, heated and stirred at 100°C for 1.5h, and then 15g of polyamide 651 was added to obtain a silicon-modified wear-resistant coating; the mass volume ratio of perfluorodecyl triethoxysilane, γ-glycidyloxypropyl trimethoxysilane, deionized water, and hydrochloric acid was 1.4g:1g:1.1mL:0.15mL; Step S7: Mix T400 alloy powder and cobalt-coated silicon carbide powder, and mechanically ball mill for 20 minutes to obtain high-wear-resistant metal powder; lay the high-wear-resistant metal powder on the surface of the steel, and obtain pretreated steel by laser cladding; apply the silicon-modified wear-resistant coating to the surface of the pretreated steel, and obtain the finished product after cooling and solidification; the mixing ratio of T400 alloy powder and cobalt-coated silicon carbide powder is 9:1.2; the laying thickness of the high-wear-resistant metal powder is 1 mm; laser cladding parameters: power is 1.5 kW, laser spot diameter is 6 mm, laser scanning speed is 10 mm / s, and the coating thickness of the silicon-modified wear-resistant coating is 100 μm.

[0022] Comparative Example 1: The high wear-resistant metal powder was removed and the steel was not pretreated. The rest was the same as in Example 1, and the specific steps were as follows: Step S1: carbon nanotubes were added to a mixed solution of isopropyl alcohol and deionized water, and then 24wt% ammonia water was added, ultrasonically dispersed at 30°C for 12 minutes, and then ethyl orthosilicate was slowly added dropwise. After the addition was completed, the mixture was reacted at 60°C for 12 hours. After the reaction was completed, the mixture was washed with water, washed with alcohol, and dried to obtain silicon-coated carbon nanotubes; potassium titanate whiskers were added to the mixed solution of isopropyl alcohol and deionized water. 24 wt% ammonia water was added, ultrasonically dispersed at 30 ° C for 18 minutes, and then tetraethyl orthosilicate was slowly added dropwise. After the addition was completed, the mixture was reacted at 60 ° C for 16 hours. After the reaction was completed, the mixture was washed with water, washed with alcohol, and dried to obtain silicon-coated potassium titanate whiskers. The volume ratio of isopropanol and deionized water in the mixed solution was 8:2.5; the reaction mass ratio of carbon nanotubes, ammonia water, and tetraethyl orthosilicate was 0.5:3.4:3.7; the reaction mass ratio of potassium titanate whiskers, ammonia water, and tetraethyl orthosilicate was 0.5:3.4:3.7. Step S2: adding silicon-coated potassium titanate whiskers and dopamine hydrochloride to a Tris buffer solution, stirring for 15 minutes, then adding silicon-coated carbon nanotubes, and continuing to stir for 25 hours. After the stirring is completed, the solution is centrifuged, washed, adjusted to a neutral pH, and freeze-dried to obtain a wear-resistant filler; the pH of the Tris buffer solution is 8.7, and the concentration of the solute tris(hydroxymethyl)aminomethane is 12 mmol / L; wherein the concentrations of the silicon-coated potassium titanate whiskers, dopamine hydrochloride, and silicon-coated carbon nanotubes in the reaction solution are all 2.6 g / L; Step S3: Under a nitrogen environment, perfluorodecyl triethoxysilane and γ-glycidyloxypropyl trimethoxysilane were mixed, stirred continuously and heated to 70°C, and then a mixed solution of 1 mol / L hydrochloric acid and deionized water was added dropwise. After the addition was completed, the reaction was continued for 4 hours to obtain a hydrophobic epoxy silicone; then 40g of epoxy resin, 12g of wear-resistant filler, and 1g of dispersant 5040 were added to 20g of the hydrophobic epoxy silicone, heated and stirred at 110°C for 2.0h, and then 15g of polyamide 651 was added to obtain a silicon-modified wear-resistant coating; the mass volume ratio of perfluorodecyl triethoxysilane, γ-glycidyloxypropyl trimethoxysilane, deionized water, and hydrochloric acid was 1.4g:1g:1.1mL:0.15mL; Step S4: applying the silicon-modified wear-resistant coating to the surface of the steel material, cooling and solidifying the steel material to obtain a finished product. The coating thickness of the silicon-modified wear-resistant coating is 100 μm.

[0023] Comparative Example 2: The silicon-modified wear-resistant coating was removed, and the rest was the same as in Example 1, with the following specific steps: Step S1: adding silicon carbide powder to a 2.4 mol / L hydrochloric acid solution, ultrasonically stirring at 30° C. for 3.0 h, and then centrifuging, washing, and drying to obtain pretreated silicon carbide powder; Step S2: adding the pretreated silicon carbide powder to a mixed solution of isopropanol and deionized water, then adding 24 wt% ammonia water, ultrasonically dispersing at 30°C for 25 minutes, then slowly adding tetraethyl orthosilicate dropwise, reacting at 60°C for 18 hours after the addition is completed, washing with water, washing with alcohol, and drying to obtain silicon-coated silicon carbide powder; the volume ratio of isopropanol to deionized water in the mixed solution is 8:2.5; the reaction mass ratio of the pretreated silicon carbide powder, ammonia water, and tetraethyl orthosilicate is 0.5:3.9:4.2; Step S3: mixing silicon-coated silicon carbide powder and metal cobalt powder, maintaining the mixture at 850° C. for 18 minutes, and then naturally cooling, washing, and drying the mixture to obtain cobalt-coated silicon carbide powder; the mixing ratio of the silicon-coated silicon carbide powder to the metal cobalt powder is 1:0.7; Step S4: T400 alloy powder and cobalt-coated silicon carbide powder are mixed and mechanically ball milled for 30 minutes to obtain high-wear-resistant metal powder; the high-wear-resistant metal powder is laid on the surface of the steel and laser clad to obtain a finished product; the mixing ratio of T400 alloy powder and cobalt-coated silicon carbide powder is 9:1.2; the laying thickness of the high-wear-resistant metal powder is 1 mm; laser cladding parameters: power is 1.7 kW, laser spot diameter is 8 mm, and laser scanning speed is 12 mm / s.

[0024] Detection test:

[0025] Hardness test: The finished product prepared by the present invention was used as a sample, and a microhardness test was performed on the sample using an HVS-1000 digital microhardness tester, with a loading load of 2 N and a holding time of 15 s.

[0026] Wear resistance test: The finished product prepared by the present invention was cut into samples with a size of 15×15×15 mm. The samples were subjected to a friction and wear tester. A silicon nitride ball with a diameter of 6 mm was used. A force of 50 N was applied in the vertical direction and rubbed back and forth for 30 minutes. The temperature of the testing machine was set to 500°C. The test results were entered into the formula to calculate the wear rate.

[0027] Water contact angle test: The finished product prepared by the present invention was cut into samples with a size of 15×15×15 mm. The water contact angle of the samples was measured using a JGW-360B water contact angle meter. 5 μL of deionized water was used for each test. The results are shown in the following table:

[0028] Conclusion: The dosage of Examples 1 to 3 remains unchanged, and only some reaction parameters are modified. The experimental data show that there is no significant fluctuation in the performance of the samples. Comparative Example 1: The high wear-resistant metal powder is removed, and no steel pretreatment is performed. The rest is the same as Example 1. The experimental data show that compared with Example 1, the Vickers hardness is reduced to 139HV and the volume wear is increased to 0.0288mm. 3 The reason is analyzed as follows: the laser cladding layer formed on the steel surface by adding high-wear-resistant metal powder in the present invention has excellent hardness and wear resistance. Therefore, after removing it, the Vickers hardness decreases and the volume wear increases.

[0029] Comparative Example 2: The silicon modified wear-resistant coating is removed, and the rest is the same as Example 1. From the experimental data, it can be seen that compared with Example 1, the Vickers hardness is reduced to 578HV, and the volume wear is increased to 0.0137mm. 3 , the water contact angle is reduced to 81°. The reasons are analyzed as follows: the silicon-modified wear-resistant coating contains a large amount of fluorine elements, so the surface energy of the coating formed is low and it has good hydrophobic and corrosion-resistant properties; in addition, the silicon-modified wear-resistant coating contains wear-resistant components such as silicone and wear-resistant fillers, so after removing the silicon-modified wear-resistant coating, the Vickers hardness decreases, the volume wear increases, and the water contact angle decreases.

[0030] It is to be noted that, in the present text, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0031] Finally, it should be noted that the above-mentioned only constitutes preferred embodiments of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications, equivalent replacements, improvements and the like of the technical solutions described in the foregoing embodiments can still be made. Any modifications, equivalent replacements, improvements and the like made within the spirit and principle of the present application shall be included in the scope of protection of the present application.

Claims

1. A method for preparing steel doors and windows based on wear-resistant coating, characterized in that: The method comprises the following steps: mixing T400 alloy powder and cobalt-coated silicon carbide powder, and subjecting the mixture to mechanical ball milling for 20-30 minutes to obtain high-wear-resistant metal powder; laying the high-wear-resistant metal powder on the surface of steel, and subjecting the mixture to laser cladding to obtain pretreated steel; and coating the surface of the pretreated steel with silicon-modified wear-resistant coating, and cooling and solidifying the coating to obtain a finished product.

2. The method for preparing steel doors and windows based on wear-resistant coating according to claim 1, characterized in that: The mixing ratio of T400 alloy powder and cobalt-coated silicon carbide powder is 9:(1.0-1.5); the laying thickness of high-wear-resistant metal powder is 1.0-1.1mm; laser cladding parameters: power is 1.5-1.7KW, laser spot diameter is 6-8mm, laser scanning speed is 10-12mm / s; the coating thickness of silicon-modified wear-resistant coating is 100-120μm.

3. The method for preparing steel doors and windows based on wear-resistant coating according to claim 2, characterized in that: The preparation process of cobalt-coated silicon carbide powder is as follows: Step S1: adding silicon carbide powder to a 2.3-2.5 mol / L hydrochloric acid solution, stirring with ultrasound at 25-30° C. for 2.5-3.0 hours, centrifuging, washing, and drying after the stirring to obtain pretreated silicon carbide powder; Step S2: adding the pretreated silicon carbide powder to a mixed solution of isopropyl alcohol and deionized water, then adding 23-25 ​​wt% ammonia water, ultrasonically dispersing at 25-30° C. for 20-25 min, then slowly adding tetraethyl orthosilicate dropwise, reacting at 55-60° C. for 15-18 h after the addition, washing with water, washing with alcohol, and drying to obtain silicon-coated silicon carbide powder; Step S3: mixing silicon-coated silicon carbide powder and metal cobalt powder, and keeping the mixture at 800-850° C. for 15-18 minutes. After the heat preservation, naturally cooling, washing, and drying are performed to obtain cobalt-coated silicon carbide powder.

4. The method for preparing steel doors and windows based on wear-resistant coating according to claim 3, characterized in that: In step S2, the volume ratio of isopropyl alcohol and deionized water in the mixed solution is 8:(2-3); the reaction mass ratio of pretreated silicon carbide powder, ammonia water, and tetraethyl orthosilicate is 0.5:(3.8-4.0):(4.0-4.5).

5. The method for preparing steel doors and windows based on wear-resistant coating according to claim 3, characterized in that: In step S3, the mixing ratio of the silicon-coated silicon carbide powder and the metal cobalt powder is 1:(0.6-0.8).

6. The method for preparing steel doors and windows based on wear-resistant coating according to claim 1, characterized in that: The preparation process of silicon-modified wear-resistant coating is as follows: Step S1: adding carbon nanotubes to a mixed solution of isopropanol and deionized water, then adding 23-25wt% ammonia water, ultrasonically dispersing at 25-30°C for 10-12 minutes, then slowly adding tetraethyl orthosilicate dropwise, reacting at 55-60°C for 10-12 hours after the addition is completed, washing with water, washing with alcohol, and drying to obtain silicon-coated carbon nanotubes; adding potassium titanate whiskers to a mixed solution of isopropanol and deionized water, then adding 23-25wt% ammonia water, ultrasonically dispersing at 25-30°C for 15-18 minutes, then slowly adding tetraethyl orthosilicate dropwise, reacting at 55-60°C for 14-16 hours after the addition is completed, washing with water, washing with alcohol, and drying to obtain silicon-coated potassium titanate whiskers; Step S2: adding silicon-coated potassium titanate whiskers and dopamine hydrochloride to a Tris buffer solution, stirring for 10-15 minutes, then adding silicon-coated carbon nanotubes, and continuing to stir for 20-25 hours. After the stirring is completed, centrifugation, washing, adjusting the pH to neutral, and freeze-drying are performed to obtain a wear-resistant filler; Step S3: Under a nitrogen environment, perfluorodecyltriethoxysilane and γ-glycidyloxypropyltrimethoxysilane are mixed, stirred continuously and heated to 65-70°C, and then a mixed solution of 0.8-1.0 mol / L hydrochloric acid and deionized water is added dropwise. After the addition is completed, the reaction is continued for 3-4 hours to obtain a hydrophobic epoxy silicone; then, epoxy resin, wear-resistant filler, and dispersant are added to the hydrophobic epoxy silicone, heated and stirred at 100-110°C for 1.5-2.0 hours, and then a curing agent is added to obtain a silicon-modified wear-resistant coating.

7. The method for preparing steel doors and windows based on wear-resistant coating according to claim 6, characterized in that: In step S1, the volume ratio of isopropyl alcohol and deionized water in the mixed solution is 8:(2-3); the reaction mass ratio of carbon nanotubes, ammonia water, and tetraethyl orthosilicate is 0.5:(3.2-3.5):(3.5-4.0); and the reaction mass ratio of potassium titanate whiskers, ammonia water, and tetraethyl orthosilicate is 0.5:(3.2-3.5):(3.5-4.0).

8. The method for preparing steel doors and windows based on wear-resistant coating according to claim 6, characterized in that: In step S2, the pH of the Tris buffer solution is 8.5-8.7, and the concentration of the solute tris(hydroxymethyl)aminomethane is 10-13 mmol / L; wherein the concentrations of the silicon-coated potassium titanate whiskers, dopamine hydrochloride, and silicon-coated carbon nanotubes in the reaction solution are all 2.5-2.7 g / L.

9. The method for preparing steel doors and windows based on wear-resistant coating according to claim 6, characterized in that: In step S3, the mass volume ratio of perfluorodecyltriethoxysilane, γ-glycidyloxypropyltrimethoxysilane, deionized water, and hydrochloric acid is (1.3-1.5) g: 1 g: (1.0-1.2) mL: (0.1-0.2) mL; the content of each component of the silicon-modified wear-resistant coating is: in parts by mass, 15-20 parts of hydrophobic epoxy silicone, 30-40 parts of epoxy resin, 10-12 parts of wear-resistant filler, 0.8-1.0 parts of dispersant, and 10-15 parts of curing agent.

10. A steel door and window based on a wear-resistant coating, characterized in that: Prepared according to the preparation method according to any one of claims 1 to 9.

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