High-bonding-strength aluminum-based wear-resistant coating material and preparation method thereof

Abstract

The invention relates to an aluminum-based wear-resistant coating material with high bonding strength. The coating material is obtained by spraying spraying powder composed of Al2O3 ceramic particles with different particle sizes and 5083 aluminum alloy powder on the surface of a stainless steel substrate layer by layer by adopting a low-pressure cold spraying technology. Meanwhile, the invention further discloses a preparation method of the coating material. The preparation method is simple, the spraying cost is low, spraying equipment is portable, and the obtained coating material is obtained through high-speed mechanical impact of two Al2O3 ceramic particles with different particle sizes on 5083 aluminum alloy powder and the dispersion strengthening effect of the ceramic particles on a metal coating matrix in the spraying process. The method is suitable for preparation of the high-bonding-strength, corrosion-resistant and wear-resistant aluminum-based coating on the surface of the metal material and on-site additive repair.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of surface protective coating and additive repair technology of metal materials, and particularly relates to a high-bond-strength aluminum-based wear-resistant coating material and a preparation method thereof. BACKGROUND

[0002] Surface protective coating materials of advanced marine equipment are the key to guarantee the long service life of mechanical equipment in marine environment. However, during the actual service of marine equipment, the surface protective coating materials of the equipment often have problems such as coating peeling, aging and corrosion under the coupling action of wear, corrosion, strong ultraviolet and high-low temperature alternation, which seriously affect the operation stability and service life of the equipment. Therefore, the design, preparation and application of high-performance protective coating materials are of great significance to the development of advanced marine equipment.

[0003] Compared with the commonly used polymer protective coating, the aluminum-based protective coating material has a wide application prospect in the field of protective coating materials of modern marine equipment due to its excellent mechanical properties, corrosion resistance and wear resistance. Therefore, the design, preparation and application of high-bond-strength, corrosion-resistant and wear-resistant aluminum-based coating materials have become one of the important development directions of high-performance metal protective coating materials on the surface of modern marine equipment. The design of hard particle reinforced aluminum-based coating materials and the application of advanced coating preparation technology have become an effective way to improve the comprehensive performance of the coating. However, the traditional thermal spraying and laser cladding coating preparation technologies have problems such as ablation, oxidation and thermal stress concentration of low-melting-point material components during the preparation of aluminum-based metal coating materials, which directly leads to the decline of the mechanical properties, corrosion resistance and wear resistance of the coating. Therefore, patent CN115613026A discloses a preparation method of a cold-sprayed aluminum-based composite wear-resistant coating on the surface of a magnesium alloy. The mixed powder of Al and Al2O3 (Al2O3 volume ratio of 15% to 45%, Al balance; powder average particle size of 25 to 50 μm) is deposited on the surface of the magnesium alloy by cold spraying technology (carrier gas is nitrogen, spraying distance is 25 to 40 mm, carrier gas pressure is 1.0 to 2.2 MPa, carrier gas temperature is 220 to 240℃, powder feeding voltage is 25 to 30 mV) to prepare the aluminum-based coating, and then the aluminum-based coating is heat treated by combining with a low-temperature annealing process, so as to improve the bonding strength and wear resistance of the aluminum-based coating. However, the aluminum-based coating and its preparation method have limitations for the preparation and on-site repair of the aluminum-based protective coating on the surface of the equipment, and have problems such as high coating preparation cost and complex process flow. Therefore, how to design and simply and efficiently prepare the high-bond-strength aluminum-based wear-resistant coating material has become one of the technical difficulties to be solved in the research of high-performance aluminum-based protective coating at the present stage. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a high-bond-strength aluminum-based wear-resistant coating material with good performance.

[0005] Another technical problem to be solved by the present application is to provide a preparation method of the high bonding strength aluminum-based wear-resistant coating material.

[0006] To solve the above problems, the high bonding strength aluminum-based wear-resistant coating material is characterized in that the coating material is obtained by layer-by-layer spraying of spraying powder composed of Al2O3 ceramic particles with two different particle sizes and 5083 aluminum alloy powder on the surface of a stainless steel substrate by using low-pressure cold spraying technology.

[0007] The spraying powder is composed of mixed powder and Al2O3 ceramic particles with a larger particle size; the mixed powder is composed of 5083 aluminum alloy powder and Al2O3 ceramic particles with a smaller particle size.

[0008] The Al2O3 ceramic particles refer to polygonal Al2O3 powder prepared by a sintering and crushing process, and the particle sizes are 100-150 μm and 15-45 μm, respectively.

[0009] The 5083 aluminum alloy powder refers to atomized spherical or spherical-like powder with a particle size of 5-50 μm.

[0010] The preparation method of the high bonding strength aluminum-based wear-resistant coating material as described above comprises the following steps: (1) Preparation of spraying powder: According to mass percentage, 70-95 wt.% of mixed powder and 5-30 wt.% of Al2O3 ceramic particles with a particle size of 100-150 μm are weighed; the mixed powder is composed of 30 wt.% of Al2O3 ceramic particles with a particle size of 15-45 μm and 70 wt.% of 5083 aluminum alloy powder; after the mechanical mixing of all powder raw materials is uniform, drying at 50-60 °C for 1-2 h, the spraying powder is obtained; (2) Preparation of high bonding strength aluminum-based wear-resistant coating material: After the surface of the stainless steel substrate is polished by sandpaper, ultrasonic cleaning with anhydrous ethanol solution and drying at 60-80 °C for 0.5-1 h, the substrate surface after cleaning and drying is subjected to sandblasting treatment by using a low-pressure cold spraying equipment, and the sand particles remaining on the substrate surface are blown clean by compressed air after sandblasting, thereby obtaining a pretreated stainless steel substrate; finally, the spraying powder is deposited on the surface of the pretreated stainless steel substrate by using a spraying system composed of a low-pressure cold spraying equipment and a three-dimensional numerical control slide rail, thereby obtaining a high bonding strength aluminum-based wear-resistant coating material.

[0011] The sand blasting treatment in step 2 refers to using 100-150 mesh polygonal aluminum oxide sand under the conditions of a sand blasting pressure of 0.60-0.80 MPa, a sand blasting angle of 50-60°, and a sand blasting distance of 25-35 mm.

[0012] The air pressure for removing residual sand particles on the surface of the substrate after the sand blasting in step 2 is 0.65-0.80 MPa.

[0013] The conditions for the spray deposition in step 2 refer to using compressed air as the working gas of the low-pressure cold spraying equipment, with a gas pressure of 0.70-0.80 MPa; the spray gun is controlled by a three-dimensional numerical control slide rail to perform planar and repeated spraying in an arch-shaped spraying path, with a spacing of 1 mm between adjacent spraying paths, a spraying moving speed of 25-35 mm / s, a spraying angle of 90°, a spraying distance of 8-12 mm, a spraying gas heating temperature of 500 DEG C, and a number of continuous repeated spraying layers of 6-8 layers.

[0014] Compared with the prior art, the present application has the following advantages: 1. By changing the content of the large-particle-size aluminum oxide powder in the spraying powder, the high-speed mechanical impact of the aluminum oxide particles in the spraying process is controlled, which increases the deformation degree of the 5083 aluminum alloy powder and realizes the dispersion strengthening of the aluminum oxide particles of different sizes on the aluminum-based coating substrate, so that the bonding strength and wear resistance of the aluminum-based coating are improved.

[0015] 2. Compared with the existing aluminum-based coating preparation technology, the present application realizes the design and preparation of the high-bonding-strength aluminum-based wear-resistant coating on the surface of the stainless steel substrate by using the low-pressure cold spraying technology combined with the component and structure design of the spraying powder, and the process flow is simple and the coating preparation reliability is high.

[0016] 3. Compared with the existing aluminum-based coating preparation technology, the coating preparation technology has the advantages of low spraying temperature, high powder deposition efficiency, and low internal stress of the coating, which can realize the preparation of high-density coating and effectively avoid the oxidation and ablation of the low-melting-point trace components in the aluminum alloy raw material.

[0017] 4. Compared with the existing aluminum-based coating preparation technology, the coating preparation technology has less limitation on the coating thickness, the spraying equipment is portable, the spraying cost is low, and it can be used for the preparation of the high-bonding-strength aluminum-based wear-resistant protective coating on the surface of equipment and the on-site additive repair of damaged surfaces. BRIEF DESCRIPTION OF DRAWINGS

[0018] The specific embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

[0019] Figure 1The cross-section SEM photo of the high bonding strength aluminum-based wear-resistant coating material according to Embodiment 3 of the present application.

[0020] Figure 2 The coating friction coefficient-time curve (left) and the coating wear rate (right) of the present application at room temperature. DETAILED DESCRIPTION

[0021] A high bonding strength aluminum-based wear-resistant coating material, which is obtained by layer-by-layer spraying of a spraying powder composed of Al2O3 ceramic particles with two different particle sizes and 5083 aluminum alloy powder on the surface of a stainless steel substrate by using a low-pressure cold spraying technology.

[0022] The coating material of the present application realizes the design and preparation of the high bonding strength aluminum-based wear-resistant coating material on the surface of a stainless steel substrate by using the high-speed mechanical impact of the two different particle sizes of Al2O3 ceramic particles on the 5083 aluminum alloy powder and the dispersion strengthening effect of the ceramic particles on the metal coating substrate during the spraying process.

[0023] The spraying powder is composed of the mixed powder and the Al2O3 ceramic particles with a larger particle size; the mixed powder is composed of the 5083 aluminum alloy powder and the Al2O3 ceramic particles with a smaller particle size.

[0024] The Al2O3 ceramic particles refer to polygonal Al2O3 powder prepared by using a sintering and crushing process, and the particle sizes are 100-150 μm and 15-45 μm, respectively.

[0025] The 5083 aluminum alloy powder refers to atomized spherical or quasi-spherical powder with a particle size of 5-50 μm; the composition is 4.71% Mg, 0.70% Mn, 0.074% Si, 0.044% Cu, 0.056% Zn, 0.19% Cr, 0.06% Fe, 0.008% O and the balance of Al by weight percentage (g).

[0026] A preparation method of a high bonding strength aluminum-based wear-resistant coating material, which comprises the following steps: (1) Preparation of the spraying powder: The mixed powder is composed of 30 wt.% Al2O3 ceramic particles with a particle size of 15-45 μm and 70 wt.% 5083 aluminum alloy powder; all the powder raw materials are uniformly mixed by using a mechanical mixing method, dried at 50-60 °C for 1-2 h, and the spraying powder is obtained.

[0027] Preferred formula: 95 wt.% of (70 wt.% 5083 aluminum alloy powder + 30 wt.% 15~45 μm Al2O3 ceramic particles) + 5 wt.% Al2O3 ceramic particles (100~150 μm); or 85 wt.% of (70 wt.% 5083 aluminum alloy powder + 30 wt.% 15~45 μm Al2O3 ceramic particles) + 15 wt.% Al2O3 ceramic particles (100~150 μm); or 70 wt.% of (70 wt.% 5083 aluminum alloy powder + 30 wt.% 15~45 μm Al2O3 ceramic particles) + 30 wt.% Al2O3 ceramic particles (100~150 μm).

[0028] (2) Preparation of high bonding strength aluminum-based wear-resistant coating material: The surface of the stainless steel substrate was polished with 200~800 mesh sandpaper to remove contaminants and oxide layers, and the surface of the substrate was cleaned by ultrasonic cleaning with anhydrous ethanol solution to remove abrasive dust. Then, the substrate was dried at 60~80°C for 0.5~1 h, and then the cleaned and dried substrate surface was sandblasted using a low-pressure cold spraying device with 100~150 mesh polygonal alumina sand. The sandblasting pressure was 0.60~0.80 MPa, the sandblasting angle was 50°~60°, and the sandblasting distance was 25~35 mm. After sandblasting, the residual sand particles on the substrate surface were blown clean with compressed air at a pressure of 0.65~0.80 MPa, and the pretreated stainless steel substrate was obtained. Finally, a spraying system composed of a low-pressure cold spraying device and a three-dimensional numerical control slide rail was used, with compressed air as the working gas of the low-pressure cold spraying device, and the gas pressure was 0.70~0.80 MPa. The spraying gun was controlled by the three-dimensional numerical control slide rail to deposit the spraying powder on the pretreated stainless steel substrate surface. The spraying gun was sprayed in a plane and repeated spraying path with an arch-shaped spraying path, the adjacent spraying path distance was 1 mm, the spraying moving speed was 25~35 mm / s, the spraying angle was ~90°, the spraying distance was 8~12 mm, the spraying gas heating temperature was 500°C, and the continuous repeated spraying layer number was 6~8 layers, and the high bonding strength aluminum-based wear-resistant coating material was obtained.

[0029] Example 1 A method for preparing a high bonding strength aluminum-based wear-resistant coating material, comprising the following steps: (1) Preparation of spraying powder: The formula composition of the spraying powder is 95 wt.% of (70 wt.% 5083 aluminum alloy powder + 30 wt.% 15~45 μm Al2O3 ceramic particles) + 5 wt.% Al2O3 ceramic particles (100~150 μm).

[0030] Accurately weigh 150 g of 5083 aluminum alloy powder and Al2O3 ceramic particles of different particle sizes using an electronic balance; after all the powder raw materials are uniformly mixed by mechanical mixing, they are placed in a drying oven at 60°C for 1 h to obtain the spraying powder.

[0031] (2) Preparation of high bonding strength aluminum-based wear-resistant coating material: First, use 200-800 mesh SiC sandpaper to polish and remove contaminants and oxide layers from the surface of the stainless steel substrate, then ultrasonically clean the substrate in anhydrous ethanol solution to remove surface debris, and then place it in a drying oven at 60°C for 1 h.

[0032] Then, use 100-150 mesh polygonal alumina sand to sandblast the cleaned and dried substrate surface using a low-pressure cold spraying equipment, with a sandblasting pressure of 0.60-0.70 MPa, a sandblasting angle of 50°-60°, and a sandblasting distance of 25-30 mm. After sandblasting, use compressed air with a pressure of 0.65-0.80 MPa to blow away the sand particles remaining on the substrate surface, and obtain the pretreated stainless steel substrate.

[0033] Finally, use the DYMET 423 portable low-pressure cold spraying equipment combined with a three-dimensional numerical control sliding rail spraying system, with compressed air as the working gas for the low-pressure cold spraying equipment, and the gas pressure being 0.70-0.80 MPa. Control the spray gun through the three-dimensional numerical control sliding rail to deposit the spraying powder on the pretreated stainless steel substrate surface, with the spray gun spraying in an arch-shaped path for plane and repeated spraying, with an adjacent spraying path spacing of 1 mm, a spraying moving speed of 25-30 mm / s, a spraying angle of ~90°, a spraying distance of 8-10 mm, and a spraying gas heating temperature of 500°C. Continuously repeat the spraying for 8 layers to obtain the high bonding strength aluminum-based wear-resistant coating material.

[0034] The high bonding strength aluminum-based wear-resistant coating material has good interface bonding with the substrate, the coating surface is uniform and the structure is dense, and the average thickness is 539.7±10.3 μm.

[0035] The prepared coating material was subjected to coating bonding strength characterization on a WDW-200 universal material tensile testing machine. The coating bonding strength test was carried out according to the ASTM C633 test standard, and the coating material tensile test speed was 0.015 mm / s. The results showed that the maximum tensile strength of the coating tensile sample at the time of fracture was 62.8 MPa and the fracture occurred at the adhesive bonding site, indicating that the coating bonding strength was higher than 62.8 MPa.

[0036] The prepared coating material was subjected to surface polishing treatment and then subjected to tribological performance characterization on a GT-1 friction and wear tester. The friction and wear test conditions were as follows: reciprocating sliding friction and wear mode, friction pair was alumina ball (Φ6 mm), load 5 N, reciprocating radius 5 mm, sliding speed 5 cm / s, friction time 30 min; the wear volume of the coating was measured by a probe-type friction and wear tester, and then the wear rate was calculated. The test results are shown in Table 1. Figure 2 The average friction coefficient and wear rate of the coating were 0.56 and (2.95±0.08)×10 -4 mm 3 / N·m, respectively.

[0037] Example 2: A preparation method of an aluminum-based wear-resistant coating material with high bonding strength, comprising the following steps: (1) Preparation of spraying powder: The formula composition of the spraying powder: 85 wt.% of (70 wt.% 5083 aluminum alloy powder + 30 wt.% 15-45 μm Al2O3 ceramic particles) + 15 wt.% Al2O3 ceramic particles (100-150 μm).

[0038] An electronic balance was used to accurately weigh 150 g of 5083 aluminum alloy powder and Al2O3 ceramic particles with different particle sizes; all the powder raw materials were uniformly mixed by mechanical mixing, and then placed in a drying box at 50°C for 2 h to obtain the spraying powder.

[0039] (2) Preparation of an aluminum-based wear-resistant coating material with high bonding strength: First, the surface of the stainless steel substrate was polished to remove contaminants and oxide layers using 200-600 mesh SiC sandpaper, and then ultrasonically cleaned in anhydrous ethanol solution to remove the abrasive debris on the surface of the substrate, and then placed in a drying box at 80°C for 0.5 h.

[0040] Then, the surface of the cleaned and dried substrate was sandblasted using a low-pressure cold spraying device with 100-150 mesh polygonal alumina sand, the sandblasting pressure was 0.60-0.80 MPa, the sandblasting angle was 50°-60°, and the sandblasting distance was 25-35 mm. After sandblasting, the residual sand particles on the surface of the substrate were blown clean with compressed air with a pressure of 0.65-0.80 MPa, thereby obtaining the pretreated stainless steel substrate.

[0041] Finally, the DYMET 423 portable low-pressure cold spraying equipment combined with a three-dimensional numerical control sliding rail spraying system was used to deposit the sprayed powder on the surface of the pretreated stainless steel substrate. Compressed air was used as the working gas for the low-pressure cold spraying equipment, and the gas pressure was 0.70-0.80 MPa. The sprayed powder was deposited on the surface of the pretreated stainless steel substrate by controlling the spray gun with the three-dimensional numerical control sliding rail. The spray gun was used to spray the powder in a plane and repeatedly in an arch-shaped spraying path. The distance between adjacent spraying paths was 1 mm, the spraying moving speed was 25-30 mm / s, the spraying angle was 90°, the spraying distance was 10-12 mm, the spraying gas heating temperature was 500°C, and the number of continuous repeated spraying layers was 6. Thus, the high bonding strength aluminum-based wear-resistant coating material was obtained.

[0042] The high bonding strength aluminum-based wear-resistant coating material had good interface bonding with the substrate, the coating surface was uniform, the structure was dense, and the average thickness was about 683.7±12.6 μm. The coating material prepared was subjected to surface polishing treatment and then was subjected to tribological performance characterization on a GT-1 friction and wear testing machine. The coating friction and wear performance test method was the same as that in Example 1. The test results are shown in Table 1.

[0043] The coating material prepared was subjected to surface polishing treatment and then was subjected to tribological performance characterization on a GT-1 friction and wear testing machine. The coating friction and wear performance test method was the same as that in Example 1. The test results are shown in Table 1. Figure 2 The average friction coefficient and the wear rate of the coating were 0.54 and (2.66±0.16)×10 -4 mm 3 / N·m, respectively.

[0044] Example 3 A method for preparing a high bonding strength aluminum-based wear-resistant coating material, comprising the following steps: (1) Preparation of a sprayed powder: The formula composition of the sprayed powder was 70 wt.% of (70 wt.% 5083 aluminum alloy powder + 30 wt.% 15-45 μm Al2O3 ceramic particles) + 30 wt.% Al2O3 ceramic particles (100-150 μm).

[0045] An electronic balance was used to accurately weigh a total of 150 g of 5083 aluminum alloy powder and Al2O3 ceramic particles with different particle sizes. After all the powder raw materials were uniformly mechanically mixed, they were placed in a drying box and dried at 60°C for 1 h. Thus, the sprayed powder was obtained.

[0046] (2) Preparation of a high bonding strength aluminum-based wear-resistant coating material: First, use 400~800 grit SiC sandpaper to polish and remove contaminants and oxide layers from the surface of the stainless steel substrate. Then, place it in an anhydrous ethanol solution for ultrasonic cleaning to remove grinding debris from the substrate surface. Finally, place it in a drying oven at 80°C for 0.5 h to dry.

[0047] Then, the cleaned and dried substrate surface is sandblasted using 100-150 mesh polygonal alumina sand with a low-pressure cold spraying device. The sandblasting pressure is 0.60-0.80 MPa, the sandblasting angle is 50°-60°, and the sandblasting distance is 25-30 mm. After sandblasting, the remaining sand particles on the substrate surface are blown away with compressed air at a pressure of 0.65-0.80 MPa, thus obtaining the pretreated stainless steel substrate.

[0048] Finally, using a DYMET 423 portable low-pressure cold spraying equipment combined with a three-dimensional CNC slide rail spraying system, compressed air was used as the working gas for the low-pressure cold spraying equipment, with a gas pressure of 0.70~0.80 MPa. The spray gun was controlled by the three-dimensional CNC slide rail to deposit the spraying powder onto the pretreated stainless steel substrate surface. The spray gun performed planar and repeated spraying in an arc-shaped spraying path, with a spacing of 1 mm between adjacent spraying paths, a spraying movement speed of 30~35 mm / s, a spraying angle of ~90°, a spraying distance of 9~11 mm, a spraying gas heating temperature of 500℃, and 6 consecutive repeated spraying layers, thus obtaining a high-bonding-strength aluminum-based wear-resistant coating material.

[0049] A cross-sectional SEM image of the high-bonding-strength aluminum-based wear-resistant coating material is shown below. Figure 1 As shown in the figure, the aluminum-based coating has a good interface with the substrate, the coating surface is uniform and the structure is dense, and the distribution of alumina particles of different sizes in the substrate is relatively uniform; the average coating thickness is approximately 562.2 ± 19.3 μm. The prepared coating material was characterized for coating bond strength using a WDW-200 universal tensile testing machine. The testing method for coating bond strength was the same as in Example 1. The results showed that the maximum tensile strength of the coated pull-out specimen at fracture was 72.2 MPa, and the fracture occurred at the film bonding point, indicating that the coating bond strength was higher than 72.2 MPa.

[0050] The prepared coating material was surface polished and then its tribological properties were characterized on a GT-1 tribological testing machine. The testing method for the tribological properties of the coating was the same as in Example 1. The test results are as follows: Figure 2 As shown, the average coefficient of friction and wear rate of the coating are 0.75 and (4.24±0.14)×10, respectively. -4 mm 3 / N·m.

Claims

1. A high bond strength aluminum-based wear resistant coating material characterized by: The coating material is obtained by layer-by-layer spraying of spraying powder composed of Al2O3 ceramic particles with two different particle sizes and 5083 aluminum alloy powder on the surface of a stainless steel substrate by using low-pressure cold spraying technology.

2. A high bond strength aluminum-based wear resistant coating material as claimed in claim 1, characterized in that: The spraying powder is composed of mixed powder and Al2O3 ceramic particles with a larger particle size; the mixed powder is composed of 5083 aluminum alloy powder and Al2O3 ceramic particles with a smaller particle size.

3. A high bond strength aluminium based wear resistant coating material as claimed in claim 1 or 2, characterised in that: The Al2O3 ceramic particles refer to polygonal Al2O3 powder prepared by a sintering crushing process, and the particle sizes are 100-150 μm and 15-45 μm, respectively.

4. A high bond strength aluminum-based wear resistant coating material as claimed in claim 1 or 2, characterized in that: The 5083 aluminum alloy powder refers to atomized spherical or spherical-like powder with a particle size of 5-50 μm.

5. The preparation method of the high-bond-strength aluminum-based wear-resistant coating material according to claim 1, comprising the following steps: (1) preparation of spraying powder: 70-95 wt.% of mixed powder and 5-30 wt.% of Al2O3 ceramic particles with a particle size of 100-150 μm are weighed according to the mass percentage; the mixed powder is composed of 30 wt.% of Al2O3 ceramic particles with a particle size of 15-45 μm and 70 wt.% of 5083 aluminum alloy powder; after the powders are uniformly mixed by mechanical mixing, the mixed powder is dried at 50-60 °C for 1-2 h to obtain the spraying powder; (2) preparation of the high-bond-strength aluminum-based wear-resistant coating material: after the surface of the stainless steel substrate is polished by sandpaper and cleaned by ultrasonic cleaning in anhydrous ethanol solution, the substrate is dried at 60-80 °C for 0.5-1 h, then the substrate surface is subjected to sandblasting treatment by using a low-pressure cold spraying equipment, and the residual sand particles on the substrate surface are removed by air blowing after the sandblasting treatment, to obtain a pretreated stainless steel substrate; finally, the spraying powder is deposited on the surface of the pretreated stainless steel substrate by using a spraying system composed of a low-pressure cold spraying equipment and a three-dimensional numerical control slide rail, to obtain the high-bond-strength aluminum-based wear-resistant coating material.

6. The method for preparing a high-bonding-strength aluminum-based wear-resistant coating material as described in claim 5, characterized in that: The sandblasting treatment in step (2) is performed under the conditions of a 100-150 mesh polygonal alumina sand, a sandblasting pressure of 0.60-0.80 MPa, a sandblasting angle of 50-60°, and a sandblasting distance of 25-35 mm.

7. The method for preparing a high-bonding-strength aluminum-based wear-resistant coating material as described in claim 5, characterized in that: The air pressure for removing the residual sand particles on the substrate surface after the sandblasting treatment in step (2) is 0.65-0.80 MPa.

8. The method for preparing a high-bonding-strength aluminum-based wear-resistant coating material as described in claim 5, characterized in that: The conditions for the spraying deposition in step (2) are as follows: compressed air is used as the working gas of the low-pressure cold spraying equipment, and the gas pressure is 0.70-0.80 MPa; the spraying gun is controlled by the three-dimensional numerical control slide rail to perform planar and repeated spraying in an arch-shaped spraying path, the distance between adjacent spraying paths is 1 mm, the spraying moving speed is 25-35 mm / s, the spraying angle is 90°, the spraying distance is 8-12 mm, the spraying gas heating temperature is 500 °C, and the number of continuous repeated spraying layers is 6-8 layers.

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