A preparation process of wear-resistant aluminum bronze alloy

Abstract

The present invention relates to the technical field of copper alloys, and more specifically, to a process for preparing a wear-resistant aluminum bronze alloy. A process for preparing a wear-resistant aluminum bronze alloy comprises the following steps: preparing an aluminum bronze alloy ingot; warm rolling the aluminum bronze alloy ingot in an ultrasonic magnetic field; and laser cladding the surface of the aluminum bronze alloy. The present invention warm-rolls the aluminum bronze alloy ingot, places the aluminum bronze alloy ingot on a turntable after each rolling pass, and ultrasonically treats the ingot in a directional magnetic field. Through multiple alternating warm rolling-ultrasonic treatments, some coarse dendrite α phases are transformed into fine, uniform equiaxed crystals, thereby improving the tensile strength and wear resistance of the wear-resistant aluminum bronze alloy. At the same time, the subtle movement of Fe and Ni in the aluminum bronze alloy ingot can effectively reduce the intercept length of the corrosion-insensitive β phase, avoid the formation of β phase corrosion channels, and greatly improve the corrosion resistance of the wear-resistant aluminum bronze alloy.

Description

Technical Field

[0001] The invention relates to the technical field of copper alloys, in particular to a preparation process of a wear-resistant aluminum bronze alloy. Background Art

[0002] Aluminum bronze alloy is an important engineering material. By adding metal elements such as aluminum, iron, and nickel to the copper matrix, aluminum bronze alloy obtains excellent wear resistance, corrosion resistance and mechanical properties. It is widely used in ships, chemical equipment, seawater treatment and other fields.

[0003] Aluminum bronze alloy is mainly produced by directly mixing and smelting metal materials such as copper, aluminum, iron, and nickel, then casting the mixture through a mold to obtain an ingot, and then subjecting the ingot to heat treatment. In order to better improve the performance of the aluminum bronze alloy, the ingot is often rolled during the heat treatment process to eliminate casting defects such as shrinkage cavities and dendritic segregation. However, in the existing ingot hot rolling process, the hot rolling mill only deforms the ingot through repeated rolling. During the repeated rolling process, the α phase and other phases in the aluminum bronze alloy ingot are prone to interact, and phase change reactions such as (α+γ2→β) occur, resulting in an unbalanced proportional relationship between the various phases of the aluminum bronze alloy, which affects the corrosion resistance and wear resistance of the aluminum bronze alloy. Summary of the Invention

[0004] In order to solve the above technical defects, the present invention has developed a preparation process for a wear-resistant aluminum bronze alloy that can greatly improve the corrosion resistance and wear resistance of the alloy.

[0005] A preparation process for a wear-resistant aluminum bronze alloy comprises the following steps:

[0006] S1: Preparation of aluminum bronze alloy ingots

[0007] Electrolytic copper powder is spread flat on the bottom of a smelting furnace, an aluminum ingot is added, and then the aluminum ingot is covered with Fe powder and Ni powder. The bottom of the smelting furnace is filled with electrolytic copper powder and then smelted. Sc and Mn are then added and smelted to obtain an alloy melt. The alloy melt is poured into a mold, slowly cooled, and then water quenched to obtain an aluminum bronze alloy ingot.

[0008] S2: Ultrasonic magnetic field warm rolling of aluminum bronze alloy ingots

[0009] The aluminum-bronze alloy ingot is placed in a hot rolling mill for warm rolling. After each rolling pass, the aluminum-bronze alloy is taken out and fixed on a turntable for ultrasonic directional magnetic field treatment. When the total deformation of the aluminum-bronze alloy ingot reaches a predetermined value, it is first water quenched and then annealed to obtain the aluminum-bronze alloy.

[0010] S3: Surface laser cladding of aluminum bronze alloy

[0011] The surface of the aluminum bronze alloy is polished and cleaned, and then dried to obtain a clean aluminum bronze alloy. Dopamine hydrochloride is first mixed with anhydrous ethanol to prepare a PDA anhydrous ethanol solution, and then ethyl orthosilicate, fluorooctyltrimethoxysilane and the PDA anhydrous ethanol solution are mixed and stirred, and ammonia water is added to obtain a pre-reaction solution. The clean aluminum bronze alloy is immersed in the pre-reaction solution, and then taken out and solidified to obtain a SiO2 coated aluminum bronze alloy. Co powder, Bi powder and Ta powder are mixed and evenly sprayed on the surface of the SiO2 coated aluminum bronze alloy, and then laser cladding treatment is performed to obtain a wear-resistant aluminum bronze alloy.

[0012] Furthermore, step S1 of preparing the aluminum bronze alloy ingot comprises the following steps:

[0013] S1.1: Take 18-20 parts by weight of electrolytic copper powder and spread it on the bottom of the smelting furnace. Then, place 8-10 parts by weight of aluminum ingot on top of the electrolytic copper powder. Mix 3-5 parts by weight of Fe powder and 3-5 parts by weight of Ni powder, add them to the smelting furnace and cover the aluminum ingot. Then, add 60-65 parts by weight of electrolytic copper powder to fill the bottom of the smelting furnace. Then, adjust the temperature of the smelting furnace to 1200-1300°C for smelting. After it is completely melted into liquid, add 0.8-1 parts by weight of Sc and 1-2 parts by weight of Mn. Continue smelting for 10-15 minutes to obtain an alloy melt.

[0014] S1.2: Pour the alloy melt into a mold at a temperature of 1100-1180°C, slowly cool it to 550-600°C, and then quickly place the mold in cooling water to cool it to room temperature to obtain an aluminum bronze alloy ingot.

[0015] Furthermore, step S2 of warm rolling the aluminum-bronze alloy ingot in an ultrasonic magnetic field comprises the following steps:

[0016] S2.1: Place the aluminum-bronze alloy ingot in a hot rolling mill and heat it to 550-600℃ at a heating rate of 20-25℃ / min. Keep it at this temperature for 25-30 minutes. Then adjust the hot rolling mill to a rolling reduction rate of 8-10% per pass and a rolling mill roll speed of 4-5m / s. After each rolling pass, remove the aluminum-bronze alloy ingot from the hot rolling mill and fix it on a turntable. Adjust the turntable speed to 40-50rpm and perform ultrasonic aging on the aluminum-bronze alloy ingot using an ultrasonic impact aging instrument. The output frequency is set to 900-1000 Hz, the processing time is 20-25 seconds, and while the ultrasonic treatment is being performed, a magnetic field of 1.5-2 T is applied to the aluminum-bronze alloy ingot in a fixed direction by an electromagnet. After the ultrasonic treatment is completed, the aluminum-bronze alloy ingot is placed in a hot rolling mill and kept at 550-600° C. for 10-15 minutes, and then the rolling is continued. When the total deformation of the aluminum-bronze alloy ingot is 50-60%, a warm-rolled aluminum-bronze alloy ingot is obtained;

[0017] S2.2: placing the warm-rolled aluminum-bronze alloy ingot in cold water for water quenching, and then placing the ingot in an annealing furnace at a temperature of 550-560° C. for 3-5 hours to obtain an aluminum-bronze alloy.

[0018] Furthermore, step S3 of laser cladding the surface of the aluminum bronze alloy comprises the following steps:

[0019] S3.1: Polish the aluminum-bronze alloy surface with 400-450# sandpaper to remove the oxide film. Then, ultrasonically clean the aluminum-bronze alloy by immersing it in acetone solution and then in deionized water. Dry the aluminum-bronze alloy in a vacuum dryer at 70-75°C for 1-1.5 hours to obtain a clean aluminum-bronze alloy.

[0020] S3.2: Dopamine hydrochloride and anhydrous ethanol are mixed to prepare a PDA anhydrous ethanol solution, and tetraethyl orthosilicate, fluorooctyltrimethoxysilane, and the PDA anhydrous ethanol solution are placed in a container at a mass ratio of 1:(0.2-0.3):(25-30). The mixture is magnetically stirred at a temperature of 30-35°C and a stirring speed of 100-120 rpm for 15-20 minutes. After standing for 1-2 hours, 5-6 wt% ammonia water is added to obtain a pre-reaction solution. A clean aluminum bronze alloy is immersed in the pre-reaction solution for 2-3 hours, and then removed and cured to obtain a SiO2-coated aluminum bronze alloy.

[0021] S3.3: Co powder, Bi powder and Ta powder are mixed and stirred in a mass ratio of 1: (0.25-0.3): (0.006-0.008) to obtain metal powder, and then the metal powder is evenly sprayed on the surface of the SiO2 coated aluminum bronze alloy. Then, a CO2 laser is used to perform full-surface laser cladding treatment, and the defocus amount is adjusted to 85-90 mm, the laser scanning power is 3-3.5 kW, and the scanning speed is 10-15 mm / s to obtain a wear-resistant aluminum bronze alloy.

[0022] Furthermore, the slow cooling operation in step S1.2 is to place the mold at a temperature of 350-400° C. and cool it naturally.

[0023] Furthermore, the material of the turntable in step S2.1 is quartz ceramic.

[0024] Furthermore, the parameters of the ultrasonic cleaning in step S3.1 are: cleaning at an ultrasonic cleaning frequency of 10-15 kHz for 8-10 minutes.

[0025] Furthermore, the concentration of dopamine hydrochloride in the PDA anhydrous ethanol solution in step S3.2 is 2-3 g / L.

[0026] Furthermore, the curing process in step S3.2 is to place the material in a drying oven and heat it at 75-80° C. for 1.5-2 hours.

[0027] Furthermore, the thickness of the metal powder sprayed on the surface of the SiO2 coated aluminum bronze alloy in step S3.3 is 1.5-1.8 mm.

[0028] The beneficial effects are as follows: 1. The present invention warm-rolls the aluminum-bronze alloy ingot, and after each rolling pass, places the aluminum-bronze alloy ingot on a turntable and performs ultrasonic treatment in a directional magnetic field of 1.5-2T. First, the ferromagnetic Fe and Ni in the aluminum-bronze alloy ingot move slightly under the action of the magnetic field. Under the action of the ultrasonic treatment, not only can this slight movement phenomenon be further enhanced, so that Fe and Ni can better control the ratio of k phase and γ2 phase in the aluminum-bronze alloy ingot, but also the α phase can be fully dynamically recrystallized through multiple alternating warm rolling-ultrasonic treatments, so that some coarse dendritic α phases are transformed into fine and uniform equiaxed crystals, thereby inhibiting the formation of Widmanstätten structure that deteriorates the alloy properties, thereby improving the tensile strength and wear resistance of the wear-resistant aluminum-bronze alloy. At the same time, the slight movement of Fe and Ni in the aluminum-bronze alloy ingot can effectively reduce the intercept length of the corrosion-insensitive β phase, avoid the formation of β phase corrosion channels, and greatly improve the corrosion resistance of the wear-resistant aluminum-bronze alloy.

[0029] 2. The present invention first prepares a pre-reaction solution, and then immerses the clean aluminum bronze alloy in the solution, so that a tightly connected SiO2 film grows on the surface of the clean aluminum bronze alloy. Then, Co powder, Bi powder and Ta powder are evenly mixed and spread on the surface of the obtained SiO2-coated aluminum bronze alloy, and then laser cladding treatment is performed. The Bi element can increase the nucleation conditions of the Co-rich phase during the cladding process and reduce the grain size of the Co-rich phase particle Cu matrix, while the Ta element can increase the melting latent heat of the cladding layer, shorten the solidification time of the cladding layer, and reduce the dilution rate of the cladding layer. Finally, under the action of the SiO2 film, the thermal expansion coefficient of the cladding coating during the cladding process is greatly reduced, and a good Invar effect is maintained. The obtained cladding coating has a smooth surface and high hardness, which greatly improves the wear resistance of the wear-resistant aluminum bronze alloy.

[0030] 3. The present invention covers Fe powder and Ni powder around the aluminum ingot for smelting, so that the Fe element and Ni element can be close to the Al element, better controlling the content of β phase (Cu3Al) and γ2 phase (Al4Cu9), ensuring the proportion of corrosion-resistant phase α phase, and improving the corrosion resistance of wear-resistant aluminum bronze alloy. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a flow chart of the preparation process of the wear-resistant aluminum bronze alloy used in the embodiments of the present invention. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] Example 1

[0034] A preparation process of wear-resistant aluminum bronze alloy, such as Figure 1 As shown, the following steps are included:

[0035] S1: Preparation of aluminum bronze alloy ingots

[0036] S1.1: 18 parts by weight of electrolytic copper powder are spread evenly on the bottom of a smelting furnace. 8 parts by weight of an aluminum ingot is placed on top of the electrolytic copper powder. 3 parts by weight of Fe powder and 3 parts by weight of Ni powder are mixed evenly and added to the smelting furnace to cover the aluminum ingot. 60 parts by weight of electrolytic copper powder are then added to fill the bottom of the smelting furnace. The temperature of the smelting furnace is then adjusted to 1200°C for smelting. After the mixture is completely melted into a liquid state, 0.8 parts by weight of Sc and 1 part by weight of Mn are added. The smelting is continued for 10 minutes to obtain an alloy melt.

[0037] S1.2: The alloy melt is poured into a mold at a temperature of 1100°C, and naturally cooled at a temperature of 350°C to 550°C. The mold is then quickly placed in cooling water and cooled to room temperature to obtain an aluminum bronze alloy ingot.

[0038] S2: Ultrasonic magnetic field warm rolling of aluminum bronze alloy ingots

[0039] S2.1: placing the aluminum-bronze alloy ingot in a hot rolling mill, heating it to 550°C at a heating rate of 20°C / min, and holding it there for 25 minutes. Then, adjusting the hot rolling mill to a reduction ratio of 8% per pass and a rolling mill roll speed of 4 m / s, after each rolling pass, removing the aluminum-bronze alloy ingot from the hot rolling mill and fixing it on a quartz ceramic turntable, adjusting the quartz ceramic turntable speed to 40 rpm, and ultrasonically treating the aluminum-bronze alloy ingot using an ultrasonic impact aging instrument, with an output frequency set to 900 Hz and a treatment time of 20 s. During the ultrasonic treatment, an electromagnet applies a magnetic field of 1.5 T in a fixed direction around the aluminum-bronze alloy ingot. After the ultrasonic treatment is completed, the aluminum-bronze alloy ingot is placed in a hot rolling mill and held at 550°C for 10 minutes before continuing to roll. When the total deformation of the aluminum-bronze alloy ingot is 50%, a warm-rolled aluminum-bronze alloy ingot is obtained;

[0040] S2.2: The warm-rolled aluminum-bronze alloy ingot is placed in cold water for water quenching, and then placed in an annealing furnace for annealing at a temperature of 550° C. for 3 hours to obtain an aluminum-bronze alloy.

[0041] S3: Surface laser cladding of aluminum bronze alloy

[0042] S3.1: Polish the aluminum-bronze alloy surface with 400# sandpaper to remove the oxide film. Then, ultrasonically clean the aluminum-bronze alloy in acetone and then in deionized water for 8 minutes at 10 kHz. Then, dry the aluminum-bronze alloy in a vacuum dryer at 70°C for 1 hour to obtain a clean aluminum-bronze alloy.

[0043] S3.2: Dopamine hydrochloride and anhydrous ethanol are mixed to prepare a PDA anhydrous ethanol solution, wherein the concentration of dopamine hydrochloride in the PDA anhydrous ethanol solution is 2 g / L. Ethyl orthosilicate, fluorooctyltrimethoxysilane, and PDA anhydrous ethanol solution are placed in a container at a mass ratio of 1:0.2:25. The mixture is magnetically stirred at a stirring speed of 100 rpm at a temperature of 30°C for 15 minutes. After standing for 1 hour, 5 wt% ammonia water is added to obtain a pre-reaction solution. A clean aluminum bronze alloy is immersed in the pre-reaction solution for 2 hours, and then removed and heated in a drying oven at 75°C for 1.5 hours to obtain a SiO2-coated aluminum bronze alloy.

[0044] S3.3: Co powder, Bi powder and Ta powder are mixed and stirred in a mass ratio of 1:0.25:0.006 to obtain metal powder, and then the metal powder is evenly sprayed on the surface of the SiO2 coated aluminum bronze alloy. The thickness of the metal powder is 1.5 mm. Then, a CO2 laser is used to perform full-surface laser cladding treatment. The defocus amount is adjusted to 85 mm, the laser scanning power is 3 kW, and the scanning speed is 10 mm / s to obtain a wear-resistant aluminum bronze alloy.

[0045] Example 2

[0046] A preparation process of wear-resistant aluminum bronze alloy, such as Figure 1 As shown, the following steps are included:

[0047] S1: Preparation of aluminum bronze alloy ingots

[0048] S1.1: 20 parts by weight of electrolytic copper powder are spread evenly on the bottom of a smelting furnace. 8 parts by weight of an aluminum ingot is placed on top of the electrolytic copper powder. 5 parts by weight of Fe powder and 5 parts by weight of Ni powder are mixed evenly and added to the smelting furnace to cover the aluminum ingot. 65 parts by weight of electrolytic copper powder are then added to fill the bottom of the smelting furnace. The temperature of the smelting furnace is then adjusted to 1200°C for smelting. After the mixture is completely melted into a liquid state, 1 part by weight of Sc and 2 parts by weight of Mn are added. Smelting is continued for 10 minutes to obtain an alloy melt.

[0049] S1.2: The alloy melt is poured into a mold at a temperature of 1100°C, and naturally cooled at a temperature of 350°C to 550°C. The mold is then quickly placed in cooling water and cooled to room temperature to obtain an aluminum bronze alloy ingot.

[0050] S2: Ultrasonic magnetic field warm rolling of aluminum bronze alloy ingots

[0051] S2.1: placing the aluminum-bronze alloy ingot in a hot rolling mill, heating it to 550°C at a heating rate of 20°C / min, and holding it there for 25 minutes. Then, adjusting the hot rolling mill to a reduction ratio of 8% per pass and a rolling mill roll speed of 4 m / s, after each rolling pass, removing the aluminum-bronze alloy ingot from the hot rolling mill and fixing it on a quartz ceramic turntable, adjusting the quartz ceramic turntable speed to 40 rpm, and ultrasonically treating the aluminum-bronze alloy ingot using an ultrasonic impact aging instrument, with an output frequency set to 900 Hz and a treatment time of 20 s. During the ultrasonic treatment, an electromagnet applies a magnetic field of 1.5 T in a fixed direction around the aluminum-bronze alloy ingot. After the ultrasonic treatment is completed, the aluminum-bronze alloy ingot is placed in a hot rolling mill and held at 550°C for 10 minutes before continuing to roll. When the total deformation of the aluminum-bronze alloy ingot is 50%, a warm-rolled aluminum-bronze alloy ingot is obtained;

[0052] S2.2: The warm-rolled aluminum-bronze alloy ingot is placed in cold water for water quenching, and then placed in an annealing furnace for annealing at a temperature of 550° C. for 3 hours to obtain an aluminum-bronze alloy.

[0053] S3: Surface laser cladding of aluminum bronze alloy

[0054] S3.1: Polish the aluminum-bronze alloy surface with 400# sandpaper to remove the oxide film. Then, ultrasonically clean the aluminum-bronze alloy in acetone and then in deionized water for 8 minutes at 10 kHz. Then, dry the aluminum-bronze alloy in a vacuum dryer at 70°C for 1 hour to obtain a clean aluminum-bronze alloy.

[0055] S3.2: Dopamine hydrochloride and anhydrous ethanol are mixed to prepare a PDA anhydrous ethanol solution, wherein the concentration of dopamine hydrochloride in the PDA anhydrous ethanol solution is 3 g / L. Ethyl orthosilicate, fluorooctyltrimethoxysilane, and PDA anhydrous ethanol solution are placed in a container at a mass ratio of 1:0.3:30. The mixture is magnetically stirred at a stirring speed of 100 rpm at a temperature of 30°C for 15 minutes. After standing for 1 hour, 5 wt% ammonia water is added to obtain a pre-reaction solution. A clean aluminum bronze alloy is immersed in the pre-reaction solution for 2 hours, and then removed and heated in a drying oven at 75°C for 1.5 hours to obtain a SiO2-coated aluminum bronze alloy.

[0056] S3.3: Co powder, Bi powder and Ta powder are mixed and stirred in a mass ratio of 1:0.3:0.008 to obtain metal powder, and then the metal powder is evenly sprayed on the surface of the SiO2 coated aluminum bronze alloy. The thickness of the metal powder is 1.5 mm. Then, a CO2 laser is used to perform full-surface laser cladding treatment. The defocus amount is adjusted to 85 mm, the laser scanning power is 3 kW, and the scanning speed is 10 mm / s to obtain a wear-resistant aluminum bronze alloy.

[0057] Example 3

[0058] A preparation process of wear-resistant aluminum bronze alloy, such as Figure 1 As shown, the following steps are included:

[0059] S1: Preparation of aluminum bronze alloy ingots

[0060] S1.1: 18 parts by weight of electrolytic copper powder are spread evenly on the bottom of a smelting furnace. 8 parts by weight of an aluminum ingot is placed on top of the electrolytic copper powder. 3 parts by weight of Fe powder and 3 parts by weight of Ni powder are mixed evenly and added to the smelting furnace to cover the aluminum ingot. 60 parts by weight of electrolytic copper powder are then added to fill the bottom of the smelting furnace. The temperature of the smelting furnace is then adjusted to 1300°C for smelting. After the mixture is completely melted into a liquid state, 0.8 parts by weight of Sc and 1 part by weight of Mn are added. The smelting is continued for 15 minutes to obtain an alloy melt.

[0061] S1.2: The alloy melt is poured into a mold at a temperature of 1180°C, and naturally cooled at a temperature of 400°C to 600°C. The mold is then quickly placed in cooling water and cooled to room temperature to obtain an aluminum bronze alloy ingot.

[0062] S2: Ultrasonic magnetic field warm rolling of aluminum bronze alloy ingots

[0063] S2.1: Place the aluminum-bronze alloy ingot in a hot rolling mill and heat it to 600°C at a heating rate of 25°C / min. Hold the temperature for 30 minutes. Then, adjust the hot rolling mill to a 10% reduction per pass and a rolling mill roll speed of 5 m / s. After each rolling pass, remove the aluminum-bronze alloy ingot from the hot rolling mill and fix it on a quartz ceramic turntable. Adjust the quartz ceramic turntable speed to 50 rpm. Ultrasonic treatment is performed on the aluminum-bronze alloy ingot using an ultrasonic impact aging instrument. The output frequency is set to 1000 Hz and the treatment time is 25 s. During the ultrasonic treatment, a magnetic field of 2 T in a fixed direction is applied around the aluminum-bronze alloy ingot by an electromagnet. After the ultrasonic treatment is completed, the aluminum-bronze alloy ingot is placed in a hot rolling mill and held at 600°C for 15 minutes before continuing to roll. When the total deformation of the aluminum-bronze alloy ingot is 60%, a warm-rolled aluminum-bronze alloy ingot is obtained.

[0064] S2.2: The warm-rolled aluminum-bronze alloy ingot is placed in cold water for water quenching, and then placed in an annealing furnace for annealing at a temperature of 550° C. for 5 hours to obtain an aluminum-bronze alloy.

[0065] S3: Surface laser cladding of aluminum bronze alloy

[0066] S3.1: Polish the aluminum-bronze alloy surface with 450# sandpaper to remove the oxide film. Then, ultrasonically clean the aluminum-bronze alloy in acetone and then in deionized water for 10 minutes at 15 kHz. Then, dry the aluminum-bronze alloy in a vacuum dryer at 75°C for 1.5 hours to obtain a clean aluminum-bronze alloy.

[0067] S3.2: Dopamine hydrochloride and anhydrous ethanol are mixed to prepare a PDA anhydrous ethanol solution, wherein the concentration of dopamine hydrochloride in the PDA anhydrous ethanol solution is 2 g / L. Ethyl orthosilicate, fluorooctyltrimethoxysilane, and PDA anhydrous ethanol solution are placed in a container at a mass ratio of 1:0.2:25. The mixture is magnetically stirred at a stirring speed of 120 rpm at a temperature of 35°C for 20 minutes. After standing for 2 hours, 6 wt% ammonia water is added to obtain a pre-reaction solution. A clean aluminum bronze alloy is immersed in the pre-reaction solution for 3 hours, and then removed and heated in a drying oven at 80°C for 2 hours to obtain a SiO2-coated aluminum bronze alloy.

[0068] S3.3: Co powder, Bi powder and Ta powder are mixed and stirred in a mass ratio of 1:0.25:0.006 to obtain metal powder, and then the metal powder is evenly sprayed on the surface of the SiO2 coated aluminum bronze alloy. The thickness of the metal powder is 1.8 mm. Then, a CO2 laser is used to perform full-surface laser cladding treatment. The defocus amount is adjusted to 90 mm, the laser scanning power is 3.5 kW, and the scanning speed is 15 mm / s to obtain a wear-resistant aluminum bronze alloy.

[0069] Comparative Example 1

[0070] Compared with Example 1, Comparative Example 1 is different in that the process step of placing the aluminum-bronze alloy ingot on a quartz ceramic turntable for ultrasonic magnetic field treatment after each rolling pass in step S2.1 is removed in Comparative Example 1. Instead, after each rolling pass, the ingot is kept at 550° C. for 10 minutes before continuing rolling. When the total deformation of the aluminum-bronze alloy ingot is 50%, a warm-rolled aluminum-bronze alloy ingot is obtained. The remaining steps are the same as in Example 1. The wear-resistant aluminum-bronze alloy obtained is recorded as Comparative Example 1.

[0071] Comparative Example 2

[0072] Compared with Example 1, the difference of Comparative Example 2 is that step S3 is removed in Comparative Example 2, and the remaining steps are the same as those in Example 1. The obtained aluminum bronze alloy is recorded as Comparative Example 2.

[0073] Comparative Example 3

[0074] Compared with Example 1, the difference of Comparative Example 3 is that step S3.2 is removed in Comparative Example 3. In step S3.3, the metal powder is evenly sprayed on the surface of the clean aluminum bronze alloy. The remaining steps are the same as those in Example 1. The obtained wear-resistant aluminum bronze alloy is recorded as Comparative Example 3.

[0075] Comparative Example 4

[0076] Compared with Example 1, the difference of Comparative Example 4 is that in step S1.1, 18 parts by weight of copper powder, 8 parts by weight of aluminum ingot, 3 parts by weight of Fe powder and 3 parts by weight of Ni powder are directly mixed uniformly, and then added to a melting furnace for melting at a temperature of 1200°C. The remaining steps are the same as in Example 1. The obtained wear-resistant aluminum bronze alloy is recorded as Comparative Example 4.

[0077] Three portions of the wear-resistant aluminum-bronze alloy prepared in Example 1, Comparative Example 2, and Comparative Example 3 were taken, and their friction coefficients were measured using an HVS-1000A multifunctional material surface performance tester. The parameters were set as follows: test time: 0.5 h, load: 20 N, sliding speed: 50 mm / min, dry friction. The data were recorded and tabulated. As shown in Table 1, it can be seen that the friction coefficient of the wear-resistant aluminum-bronze alloy prepared in Example 1 is greater than the friction coefficient of Comparative Example 3, greater than the friction coefficient of Comparative Example 2, and greater than the friction coefficient of Comparative Example 1. This proves that multiple alternating warm rolling-ultrasonic treatments of the aluminum-bronze alloy ingot can transform some coarse dendrite α phases into fine, uniform equiaxed crystals, thereby improving the wear resistance of the wear-resistant aluminum-bronze alloy. It also proves that laser cladding of a combined coating of Co, Bi, and Ta metals on the surface of the aluminum-bronze alloy, as well as growing a SiO2 film on the surface of the clean aluminum-bronze alloy, can both improve the wear resistance of the wear-resistant aluminum-bronze alloy.

[0078] Table 1: Friction coefficients of wear-resistant aluminum bronze alloys

[0079] Friction coefficient The first Second copy The third Example 1 0.508 0.509 0.506 Example 2 0.512 0.508 0.511 Example 3 0.518 0.515 0.516 Comparative Example 1 0.306 0.308 0.305 Comparative Example 2 0.413 0.415 0.412 Comparative Example 3 0.457 0.458 0.454

[0080] Three portions of the wear-resistant aluminum bronze alloy prepared in the embodiment, comparative example 1 and comparative example 4 were taken as samples, and the sample size data was measured with a vernier caliper, and the surface area S of the sample was calculated, recorded as S, and then weighed with a digital electronic balance. The result was accurate to the ten thousandth place, recorded as W1, and then the sample was immersed in a 5% sodium chloride solution, the temperature was set to 35°C, and immersed for 96 hours. 5% sodium chloride solution was appropriately added to keep the sample immersed in the sodium chloride solution. After the experiment, the samples were taken out in turn, and the corrosion products on the surface were brushed off with a brush, and rinsed with pure water at the same time. After soaking in 10% ammonium acetate solution for 5 minutes, the samples were taken out, and the residual corrosion products were cleaned again with a brush while first rinsing with water and then with alcohol. After the sample was dried, it was weighed, and the result was also accurate to The ten-thousandth place is recorded as W2, and the corrosion rate formula is calculated according to the weight loss method: V = (W1-W2) / (S*t), where t is the time 96 hours. The corrosion rate V of each sample is calculated, and the obtained data is recorded and tabulated. As shown in Table 1, it can be seen that the corrosion rate of the wear-resistant aluminum bronze alloy prepared in Example is less than the corrosion rate of Comparative Example 4 and less than the corrosion rate of Comparative Example 1. It can be proved that multiple alternating warm rolling-ultrasonic treatments of the aluminum bronze alloy ingot can effectively reduce the intercept length of the non-corrosion-resistant β phase, avoid the formation of β phase corrosion channels, and greatly improve the corrosion resistance of the wear-resistant aluminum bronze alloy. It can also be proved that by covering Fe powder and Ni powder around the aluminum ingot for smelting, the proportion of the corrosion-resistant phase α phase can be guaranteed, thereby improving the corrosion resistance of the wear-resistant aluminum bronze alloy.

[0081] Table 2: Corrosion rates of wear-resistant aluminum bronze alloys

[0082]

[0083] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A process for preparing a wear-resistant aluminum bronze alloy, characterized in that: The following steps are involved: S1: Preparation of aluminum bronze alloy ingots Electrolytic copper powder is spread flat on the bottom of a smelting furnace, an aluminum ingot is added, and then the aluminum ingot is covered with Fe powder and Ni powder. The bottom of the smelting furnace is filled with electrolytic copper powder and then smelted. Sc and Mn are then added and smelted to obtain an alloy melt. The alloy melt is poured into a mold, slowly cooled, and then water quenched to obtain an aluminum bronze alloy ingot. S2: Ultrasonic magnetic field warm rolling of aluminum bronze alloy ingots The aluminum-bronze alloy ingot is placed in a hot rolling mill for warm rolling. After each rolling pass, the aluminum-bronze alloy is taken out and fixed on a turntable for ultrasonic directional magnetic field treatment. When the total deformation of the aluminum-bronze alloy ingot reaches 50-60%, it is first water quenched and then annealed to obtain the aluminum-bronze alloy. S3: Surface laser cladding of aluminum bronze alloy The surface of the aluminum bronze alloy is polished and cleaned, and then dried to obtain a clean aluminum bronze alloy. Dopamine hydrochloride is first mixed with anhydrous ethanol to prepare a PDA anhydrous ethanol solution, and then ethyl orthosilicate, fluorooctyltrimethoxysilane and the PDA anhydrous ethanol solution are mixed and stirred, and ammonia water is added to obtain a pre-reaction solution. The clean aluminum bronze alloy is immersed in the pre-reaction solution, and then taken out and solidified to obtain a SiO2 coated aluminum bronze alloy. Co powder, Bi powder and Ta powder are mixed and evenly sprayed on the surface of the SiO2 coated aluminum bronze alloy, and then laser cladding treatment is performed to obtain a wear-resistant aluminum bronze alloy.

2. The process for preparing a wear-resistant aluminum bronze alloy according to claim 1, characterized in that: Step S1: preparing an aluminum bronze alloy ingot, comprising the following steps: S1.1: Take 18-20 parts by weight of electrolytic copper powder and spread it on the bottom of the smelting furnace. Then, place 8-10 parts by weight of aluminum ingot on top of the electrolytic copper powder. Mix 3-5 parts by weight of Fe powder and 3-5 parts by weight of Ni powder, add them to the smelting furnace and cover the aluminum ingot. Then, add 60-65 parts by weight of electrolytic copper powder to fill the bottom of the smelting furnace. Then, adjust the temperature of the smelting furnace to 1200-1300°C for smelting. After it is completely melted into liquid, add 0.8-1 parts by weight of Sc and 1-2 parts by weight of Mn. Continue smelting for 10-15 minutes to obtain an alloy melt. S1.2: Pour the alloy melt into a mold at a temperature of 1100-1180°C, slowly cool it to 550-600°C, and then quickly place the mold in cooling water to cool it to room temperature to obtain an aluminum bronze alloy ingot.

3. The process for preparing a wear-resistant aluminum bronze alloy according to claim 1, characterized in that: Step S2, the ultrasonic magnetic field warm rolling of the aluminum bronze alloy ingot, comprises the following steps: S2.1: Place the aluminum-bronze alloy ingot in a hot rolling mill and heat it to 550-600℃ at a heating rate of 20-25℃ / min. Keep it at this temperature for 25-30 minutes. Then adjust the hot rolling mill to a rolling reduction rate of 8-10% per pass and a rolling mill roll speed of 4-5m / s. After each rolling pass, remove the aluminum-bronze alloy ingot from the hot rolling mill and fix it on a turntable. Adjust the turntable speed to 40-50rpm and perform ultrasonic aging on the aluminum-bronze alloy ingot using an ultrasonic impact aging instrument. The output frequency is set to 900-1000 Hz, the processing time is 20-25 seconds, and while the ultrasonic treatment is being performed, a magnetic field of 1.5-2 T is applied to the aluminum-bronze alloy ingot in a fixed direction by an electromagnet. After the ultrasonic treatment is completed, the aluminum-bronze alloy ingot is placed in a hot rolling mill and kept at 550-600° C. for 10-15 minutes, and then the rolling is continued. When the total deformation of the aluminum-bronze alloy ingot is 50-60%, a warm-rolled aluminum-bronze alloy ingot is obtained; S2.2: placing the warm-rolled aluminum-bronze alloy ingot in cold water for water quenching, and then placing the ingot in an annealing furnace for annealing at a temperature of 550-560° C. for 3-5 hours to obtain an aluminum-bronze alloy.

4. The process for preparing a wear-resistant aluminum bronze alloy according to claim 1, characterized in that: Step S3: laser cladding the surface of the aluminum bronze alloy, comprising the following steps: S3.1: Polish the aluminum-bronze alloy surface with 400-450# sandpaper to remove the oxide film. Then, ultrasonically clean the aluminum-bronze alloy by immersing it in acetone solution and then in deionized water. Dry the aluminum-bronze alloy in a vacuum dryer at 70-75°C for 1-1.5 hours to obtain a clean aluminum-bronze alloy. S3.2: Dopamine hydrochloride is mixed with anhydrous ethanol to prepare a PDA anhydrous ethanol solution, and tetraethyl orthosilicate, fluorooctyltrimethoxysilane, and PDA anhydrous ethanol solution are placed in a container at a mass ratio of 1:(0.2-0.3):(25-30). The mixture is magnetically stirred at a temperature of 30-35°C and a stirring speed of 100-120 rpm for 15-20 minutes. After standing for 1-2 hours, 5-6 wt% ammonia water is added to obtain a pre-reaction solution. A clean aluminum bronze alloy is immersed in the pre-reaction solution for 2-3 hours, and then removed and cured to obtain a SiO2-coated aluminum bronze alloy. S3.3: Co powder, Bi powder and Ta powder are mixed and stirred in a mass ratio of 1: (0.25-0.3): (0.006-0.008) to obtain metal powder, and then the metal powder is evenly sprayed on the surface of the SiO2-coated aluminum bronze alloy. Then, a CO2 laser is used to perform full-surface laser cladding treatment, and the defocus amount is adjusted to 85-90 mm, the laser scanning power is 3-3.5 kW, and the scanning speed is 10-15 mm / s to obtain a wear-resistant aluminum bronze alloy.

5. The process for preparing a wear-resistant aluminum bronze alloy according to claim 2, characterized in that: The slow cooling operation in step S1.2 is to place the mold at a temperature of 350-400° C. and cool it naturally.

6. The process for preparing a wear-resistant aluminum bronze alloy according to claim 3, characterized in that: The material of the turntable in step S2.1 is quartz ceramic.

7. The process for preparing a wear-resistant aluminum bronze alloy according to claim 4, characterized in that: The parameters of ultrasonic cleaning in step S3.1 are: cleaning at an ultrasonic cleaning frequency of 10-15 kHz for 8-10 minutes.

8. The process for preparing a wear-resistant aluminum bronze alloy according to claim 4, characterized in that: The concentration of dopamine hydrochloride in the PDA anhydrous ethanol solution in step S3.2 is 2-3 g / L.

9. The process for preparing a wear-resistant aluminum bronze alloy according to claim 4, characterized in that: The curing process in step S3.2 is to place the product in a drying oven and heat it at 75-80°C for 1.5-2 hours.

10. The process for preparing a wear-resistant aluminum bronze alloy according to claim 4, characterized in that: The thickness of the metal powder sprayed on the surface of the SiO2 coated aluminum bronze alloy in step S3.3 is 1.5-1.8 mm.

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