CN116005098A - Preparation method of hard coating for improving fatigue of guide cylinder of automatic inclinator - Google Patents
Preparation method of hard coating for improving fatigue of guide cylinder of automatic inclinator Download PDFInfo
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- CN116005098A CN116005098A CN202211522675.3A CN202211522675A CN116005098A CN 116005098 A CN116005098 A CN 116005098A CN 202211522675 A CN202211522675 A CN 202211522675A CN 116005098 A CN116005098 A CN 116005098A
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Abstract
The invention discloses a preparation method of a hard coating for improving fatigue of an automatic inclinator guide cylinder, which comprises the following steps: 1. cleaning and preprocessing an automatic inclinator guide cylinder; 2. sequentially carrying out surface treatment of sand blasting and shot blasting on the automatic inclinator guide cylinder subjected to the cleaning pretreatment; 3. the surface of the automatic inclinator guide cylinder after surface treatment is sprayed with a NiCrAl coating and a WC-Co coating by adopting supersonic flame to form a hard coating. According to the invention, the surface treatment is carried out by combining sand blasting and shot blasting, the roughened surface with better roughness and compressive stress is obtained, meanwhile, the sharp angle obtained by the sand blasting surface is removed, and the NiCrAl coating with the hardness between the substrate and the WC-Co coating is sprayed between the substrate and the WC-Co coating, so that fatigue cracks are prevented from expanding into the substrate, the fatigue performance of the automatic inclinator guide cylinder substrate is improved, and the method is high in reliability, free of additional equipment and suitable for popularization.
Description
Technical Field
The invention belongs to the technical field of aluminum and aluminum alloy surface hardening, and particularly relates to a preparation method of a hard coating for improving fatigue of an automatic inclinator guide cylinder.
Background
Aluminum and aluminum alloys have the advantages of low density, high specific strength and the like, and are used as the preferred lightweight structural material of the automatic inclinator guide cylinder, particularly 7075 high-strength aluminum alloy is widely applied in the field, the hardness of the alloy is generally not more than 200HV, but the hardness value can not meet the requirement of wear resistance, and the surface hardening treatment is needed. Supersonic flame sprayed tungsten carbide coatings are one of the commonly used methods of improving the wear resistance of surfaces. The tungsten carbide wear-resistant coating sprayed by the supersonic flame is mainly mechanically combined with the matrix, and the common treatment process needs to carry out sand blasting coarsening on the matrix, so that the specific surface area of the matrix is increased by sand blasting, and the combination property of the matrix and the spray coating is improved; meanwhile, the acute angle introduced by sand blasting brings a notch effect, and the fatigue performance of the matrix is affected. After the matrix is sandblasted, a supersonic flame spraying tungsten carbide wear-resistant coating is carried out, the fatigue performance of the guide cylinder can be reduced by a single tungsten carbide hard coating, and the fatigue life can be greatly reduced by preparing the tungsten carbide coating on the sandblasted matrix, so that the safety of related parts is affected.
The automatic inclinator guide cylinder is a key component of a helicopter, as described in the patent with application number 201220149023.5 of the automatic inclinator guide cylinder and the patent with application number 201710404799.4 of the automatic inclinator guide cylinder assembly and the main speed reducer, the automatic inclinator guide cylinder has higher requirements on the fatigue life of the guide cylinder in the working with the assembly, the surface quality of the guide cylinder matrix has obvious influence on the fatigue property of the guide cylinder matrix, and single sand blasting can bring a large number of defects to the matrix surface while roughening the matrix, introduces a large number of sharp angles, damages the integrity of the matrix surface and further influences the fatigue property of the matrix.
The shot blasting can form a residual compressive stress layer on the surface of the material, and is a common and effective means for improving the fatigue performance of the material. But a single shot is difficult to achieve the roughness required for supersonic flame spraying.
In the patent 201310629089.3 'surface strengthening method of aluminum alloy and composite material thereof', sand blasting is firstly adopted, then sodium hydroxide aqueous solution and nitric acid solution are used for soaking to remove surface sand blasting marks, and finally glass blasting pellets are used for obtaining a surface compressive stress layer. The method aims to obtain a hardened layer with compressive stress by shot blasting, but because the shot blasting is worried that impurities, defects and the like introduced in the plastic forming process cannot be removed, the defects such as graphite and the like, introduced impurities such as scrap iron and the like, folding, pits and the like remained on a plastic forming piece are removed by sand blasting. As can be seen from the accompanying drawings, a large amount of granular corrosion products exist on the corroded surface, and the particles are pressed into the matrix after shot blasting, so that defects are introduced. In the patent 201811312997.9, a dry sand blasting machine is used to blast sand on an aluminum-based composite material part to clean surface lubricants, scratch microcracks and the like, then a sand blasting surface is removed by adopting a grinding mode, and then shot blasting is performed to form a compressive stress layer. The above patents are all directed to removing a surface layer such as an oxide scale by sand blasting, then removing the layer by grinding or etching, and then shot blasting to obtain a hardened layer having compressive stress.
In the patent application number 201811208479.2, the surface is roughened by adopting single modes of sand blasting, shot blasting and the like, and the methods have no sequence, and only the surface is roughened, so that the obtained roughened surface has a larger sharp angle, and the fatigue performance is reduced; the roughened surface is not subjected to trimming by adopting pills, so that the roughened surface with compressive stress and sharp angles is obtained, and the fatigue performance of the matrix is facilitated. In the patent application No. 201810546610.X, a preparation method of a high fatigue performance titanium alloy spring and the patent application No. 201810546639.8, a high strength fatigue resistant titanium alloy rod wire and a preparation method thereof, a solid solution method, an aging method and the like are adopted to treat the titanium material, and then a strengthening layer with compressive stress is obtained on the surface of a titanium piece by adopting a sand blasting and/or shot blasting method. The above 2 patents are all related to the use of the pressure of sand blasting or shot blasting to obtain a reinforced layer with compressive stress, which uses the basic physical characteristics of sand blasting and shot blasting, namely, the reinforced layer with compressive stress can be obtained by striking the surface of a substrate with high-speed shot (sand) material under the drive of high compressed gas, and the 2 patent is not related to roughening surfaces, nor to the trimming of the roughened surfaces to obtain roughened surfaces without sharp angles.
The hardness of the supersonic flame sprayed tungsten carbide is about 1000HV, the matrix of the guide cylinder is aluminum, the hardness of the aluminum is not more than 200HV, a hard coating is directly sprayed on a soft matrix, and the large hardness difference between the two causes an eggshell effect, so that the guide cylinder sprayed tungsten carbide coating has a crushing risk in working; meanwhile, the hard tungsten carbide coating is easy to initiate cracks, and under the action of force, the cracks are expanded to the matrix to cause the guide cylinder to fail. Therefore, the preparation of a transition layer between a soft substrate and a hard coating is one of the methods for solving the above-mentioned problems.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a preparation method of a hard coating for improving fatigue of an automatic inclinator guide cylinder aiming at the defects of the prior art. According to the method, sand blasting and shot blasting are combined, and surface treatment is sequentially carried out on the guide cylinder of the automatic inclinator, so that a roughened surface with better roughness and compressive stress is obtained, and meanwhile, the sharp angle obtained by the sand blasting surface is removed, so that the fatigue performance of a matrix is prevented from being reduced due to a notch effect; a NiCrAl coating with hardness between the matrix and the WC-Co coating is prepared, the NiCrAl coating is used as an adhesive layer to improve the adhesive property of the coating and the matrix, and is used as a metal layer to prevent fatigue cracks generated in the WC-Co coating from expanding into the matrix, so that the fatigue property of the automatic inclinator guide cylinder matrix is improved, and the problem of greatly reducing the fatigue property after the tungsten carbide coating is sprayed after the traditional sand blasting is solved.
In order to solve the technical problems, the invention adopts the following technical scheme: a preparation method of a hard coating for improving fatigue of an automatic inclinator guide cylinder is characterized by comprising the following steps:
step one, cleaning and preprocessing an automatic inclinator guide cylinder;
placing the automatic inclinator guide cylinder subjected to the cleaning pretreatment in the step one into a sand blasting machine filled with sand blasting materials, spraying the sand blasting materials onto the surface of the automatic inclinator guide cylinder by using air pressure to perform sand blasting treatment, then placing the automatic inclinator guide cylinder subjected to sand blasting roughening into the sand blasting machine filled with the sand blasting materials, and spraying the sand blasting materials onto the surface of the automatic inclinator guide cylinder by using air pressure to perform shot blasting treatment to obtain the automatic inclinator guide cylinder subjected to surface treatment;
fixing the automatic inclinator guide cylinder obtained in the step two after surface treatment on a rotating table of supersonic flame spraying, then spraying a NiCrAl coating by adopting supersonic flame, and then spraying a WC-Co coating by adopting supersonic flame to form a hard coating on the surface of the automatic inclinator guide cylinder.
Firstly, cleaning and preprocessing an automatic inclinator guide cylinder to remove impurities and greasy dirt on the surface of the automatic inclinator guide cylinder, then, blasting sand and then blasting shot, coarsening the surface of the automatic inclinator guide cylinder by using the blasting shot to obtain a sand blasting surface with larger roughness, then, trimming the sand blasting surface by using the blasting shot, adjusting the roughness and the compressive stress of the sand blasting surface to obtain a coarsening surface with better roughness and compressive stress, and simultaneously, removing sharp angles obtained by the sand blasting surface, so that the surface of the automatic inclinator guide cylinder meets the requirements of the coarsening surface required by the subsequent supersonic flame spraying, simultaneously, the problems that a single blasting shot brings a large number of defects on the coarsening surface and damages the surface integrity are avoided, and the fatigue performance of a base body of the automatic inclinator guide cylinder is improved; then, a NiCrAl coating and a WC-Co coating are sequentially sprayed on the roughened surface of the automatic inclinator guide cylinder after surface treatment by using a supersonic flame, on one hand, the NiCrAl coating is used as a bonding layer to form good bonding with the surface of the automatic inclinator guide cylinder and the WC-Co coating, so that the bonding force between the hard coating and a matrix is improved, on the other hand, the NiCrAl coating with the hardness of about 500HV is used as a hardness transition layer, a transition effect is exerted between a matrix with lower hardness and the hard coating with higher hardness, the risk of crush in working caused by overlarge hardness difference between the matrix and the hard coating is reduced, meanwhile, the NiCrAl coating has good bearing property on the hardness, tungsten carbide cracks in the hard coating can be prevented from expanding into the matrix, the bad influence of the hard coating on the fatigue performance of the automatic inclinator guide cylinder is reduced, and the fatigue performance of the automatic inclinator guide cylinder is further improved.
The preparation method of the hard coating for improving the fatigue of the automatic inclinator guide cylinder is characterized in that the automatic inclinator guide cylinder is made of aluminum alloy materials in the first step.
The preparation method of the hard coating for improving the fatigue of the guide cylinder of the automatic inclinator is characterized by comprising the following steps of: immersing the automatic inclinator guide cylinder in a container containing a metal cleaning agent solution with the mass concentration of 0.5% -1% at 20-30 ℃ for ultrasonic cleaning for 5-20 min in an ultrasonic generator, flushing under flowing water after removal, immersing in the container containing absolute ethyl alcohol, ultrasonic cleaning for 5-10 min in the ultrasonic generator, and drying by a blower.
The preparation method of the hard coating for improving the fatigue of the guide cylinder of the automatic inclinator is characterized in that the air pressure of the sand blasting treatment in the second step is 0.1-0.6 MPa, and the distance between a spray gun and a workpiece is 50-150 mm; the air pressure of the shot blasting treatment is 0.1-0.5 MPa, and the distance between the spray gun and the workpiece is 50-150 mm.
The preparation method of the hard coating for improving the fatigue property of the automatic inclinator guide tube is characterized in that the technological parameters of the ultrasonic flame spraying NiCrAl coating in the third step are as follows: oxygen flow 18m 3 /h～24m 3 The flow rate of kerosene is 16L/h-24L/h, the powder feeding amount is 1 kg/h-10 kg/h, the spray distance is 150 mm-350 mm, the moving speed of a spray gun is 100 mm/min-600 mm/min, and the step distance of the spray gun is 1 mm-6 mm; the technological parameters of the supersonic flame spraying WC-Co coating are as follows: oxygen flow 18m 3 /h～24m 3 And/h, the flow rate of kerosene is 16-24L/h, the powder feeding amount is 1-10 kg/h, the spray distance is 150-350 mm, the moving speed of the spray gun is 100-600 mm/min, and the step distance of the spray gun is 1-6 mm.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, the surface treatment is sequentially carried out on the automatic inclinator guide cylinder by combining sand blasting and shot blasting, so that a roughened surface with better roughness and compressive stress is obtained, and meanwhile, the sharp angle obtained by the sand blasting surface is removed, so that the problems that a single sand blasting brings a large number of defects on the roughened surface and damages the surface integrity are solved, the notch effect is avoided, and the fatigue performance of the automatic inclinator guide cylinder substrate is improved.
2. According to the invention, the NiCrAl coating is added between the automatic inclinator guide tube substrate and the WC-Co coating by adopting supersonic flame spraying as a bonding layer and a transition layer, so that the bonding force between the hard coating and the substrate is improved, the crushing risk in working is reduced, the expansion of tungsten carbide cracks in the hard coating into the substrate is prevented, the adverse effect of the hard coating on the fatigue performance of the automatic inclinator guide tube is reduced, and the fatigue performance of the automatic inclinator guide tube is further improved.
3. The sand blasting and shot blasting surface treatment method has simple requirements on equipment, and is rich in selection of corresponding sand blasting materials and shot blasting materials, high in reliability, low in preparation cost, short in preparation time and suitable for popularization.
4. The invention adopts the supersonic flame to spray the NiCrAl coating and the WC-Co coating, which can be completed on the same supersonic flame spraying equipment, has high treatment efficiency, high operation cost and strong applicability, and is suitable for industrialized production in batches.
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
Drawings
FIG. 1 is a 3D topography of the surface of an automatic recliner guide cylinder of example 1 of the present invention after grit blasting.
Fig. 2 is a 3D topography of the surface of the auto-recliner guide cylinder after surface treatment in example 1 of the present invention.
FIG. 3 is a cross-sectional SEM image of a hard coating prepared according to example 1 of the invention.
FIG. 4 is a graph showing the high cycle fatigue data of the hard coating layers prepared in example 1 and comparative examples 1 to 3 according to the present invention.
Detailed Description
Example 1
The embodiment comprises the following steps:
step one, cleaning and preprocessing an automatic inclinator guide cylinder made of 7075 aluminum; the cleaning pretreatment process comprises the following steps: immersing an automatic inclinator guide cylinder in a container containing a metal cleaning agent solution with the mass concentration of 0.5% at 20-30 ℃ for ultrasonic cleaning for 20min in an ultrasonic generator, flushing under flowing water after removal, immersing in the container containing absolute ethyl alcohol, ultrasonic cleaning for 5min in the ultrasonic generator, and drying by a blower;
placing the automatic inclinator guide cylinder subjected to the cleaning pretreatment in the step one into a sand blasting machine filled with sand blasting materials, spraying 24# brown corundum on the surface of the automatic inclinator guide cylinder by using air pressure, performing sand blasting treatment, wherein the air pressure of the sand blasting treatment is 0.6MPa, the distance between the spray gun and a workpiece is 150mm, the surface sand and floating ash are removed by adopting compressed air blowing until the sand blasting surface is matte and uniform and the roughness is 10 mu m-13 mu m, then placing the automatic inclinator guide cylinder subjected to sand blasting roughening in the sand blasting machine filled with the sand blasting materials, spraying 300# zirconium oxide on the surface of the automatic inclinator guide cylinder by using the air pressure, performing shot blasting treatment, wherein the air pressure of the shot blasting treatment is 0.1MPa, the distance between the spray gun and the workpiece is 50mm, and the roughness is 8 mu m-11 mu m, and the surface shot and the floating ash are removed by adopting compressed air blowing;
fixing the automatic inclinator guide cylinder subjected to surface treatment obtained in the step two on a rotating table of supersonic flame spraying by utilizing a tool, then holding a spray gun of the supersonic flame spraying by an ABB manipulator, and spraying a NiCrAl coating on the surface of the automatic inclinator guide cylinder by adopting the supersonic flame, wherein the technological parameters are as follows: oxygen flow 24m 3 And (3) spraying for 3 times at a spray gun moving speed of 600mm/min and a spray gun step distance of 1mm, wherein the spray gun is continuously adopted to spray WC-12Co coating by supersonic flame after the automatic inclinator guide tube is cooled to room temperature, and the technological parameters are as follows: oxygen flow 18m 3 Per hour, the kerosene flow is 24L/h, and powder is fedThe amount of the paint is 10kg/h, the spray distance is 350mm, the moving speed of the spray gun is 600mm/min, the spray gun step distance is 1mm, the paint is sprayed for 6 times, a hard coating is formed on the surface of the automatic inclinator guide cylinder, and the paint is taken down after the automatic inclinator guide cylinder is cooled to room temperature.
The mechanical properties of the automatic recliner guide cylinder and the surface-treated automatic recliner guide cylinder in this example were measured, and the results are shown in table 1.
TABLE 1
As can be seen from table 1, the mechanical properties of the surface-treated auto-recliner guide cylinder substrate were comparable to those of the auto-recliner guide cylinder substrate.
3D morphology analysis was performed on the surface of the automatic inclinator guide cylinder after each treatment process in this example, and the detection equipment was a VHX-950 digital microscope system from KEYNCE, and the results are shown in FIGS. 1 to 2.
Fig. 1 is a 3D topography of the surface of the automatic recliner guide cylinder after the sand blasting treatment in this embodiment, and as can be seen from fig. 1, the surface of the automatic recliner guide cylinder after the sand blasting treatment has a large roughness and a large number of sharp angles.
Fig. 2 is a 3D topography of the surface of the automatic recliner guide cylinder after surface treatment in this embodiment, and as can be seen from fig. 2, the surface of the automatic recliner guide cylinder after surface treatment by sand blasting and shot blasting has a larger roughness but no sharp angle.
Comparing fig. 1 and fig. 2, the present invention combines sand blasting and shot blasting to obtain a roughened surface with better roughness and compressive stress, and simultaneously removes sharp angles obtained by the sand blasting surface.
FIG. 3 is a cross-sectional SEM image of a hard coating prepared in this example, and it can be seen from FIG. 3 that the intermediate NiCrAl coating is well-bonded to both the auto-recliner guide tube substrate and the WC-12Co coating.
Comparative example 1
This comparative example differs from example 1 in that: in the second step, sand blasting is only carried out on the automatic inclinator guide cylinder; in the third step, the surface of the automatic inclinator guide cylinder after surface treatment is sprayed with a WC-12Co coating by using supersonic flame.
Comparative example 2
This comparative example differs from example 1 in that: and step two, performing sand blasting treatment on the automatic inclinator guide cylinder.
Comparative example 3
This comparative example differs from example 1 in that: in the third step, the WC-12Co coating is sprayed on the surface of the automatic inclinator guide cylinder after the surface treatment by adopting supersonic flame.
FIG. 4 is a graph showing the high cycle fatigue data of the hard coating prepared in example 1 and comparative examples 1 to 3, wherein the fatigue performance of the hard coating prepared in comparative example 1 by single sand blasting treatment and supersonic flame spraying WC-12Co coating is the lowest, the fatigue performance of the hard coating prepared in comparative example 2 by single sand blasting treatment and supersonic flame spraying NiCrAl coating and supersonic flame spraying WC-12Co coating is superior to that of the hard coating prepared in comparative example 1, the fatigue performance of the hard coating prepared in comparative example 3 by sand blasting and shot blasting treatment and supersonic flame spraying WC-12Co coating is significantly superior to that of the hard coating prepared in comparative example 1, and the fatigue performance of the hard coating prepared in example 1 by sand blasting and supersonic flame spraying NiCrAl coating and supersonic flame spraying WC-12Co coating is the optimal.
In conclusion, the superhard coating prepared on the surface of the 7075 aluminum automatic inclinator guide cylinder has good mechanical properties and excellent high-cycle fatigue properties, and the surface hardness and the wear resistance of the superhard coating are greatly improved.
Example 2
The embodiment comprises the following steps:
step one, cleaning and preprocessing an automatic inclinator guide cylinder made of 7075 aluminum; the cleaning pretreatment process comprises the following steps: immersing an automatic inclinator guide cylinder in a container containing a metal cleaning agent solution with the mass concentration of 1% at 20-30 ℃ for ultrasonic cleaning for 5min in an ultrasonic generator, flushing under flowing water after removal, immersing in the container containing absolute ethyl alcohol, ultrasonic cleaning for 10min in the ultrasonic generator, and drying by a blower;
placing the automatic inclinator guide cylinder subjected to the cleaning pretreatment in the step one into a sand blasting machine filled with sand blasting materials, spraying 24# brown corundum on the surface of the automatic inclinator guide cylinder by using air pressure, performing sand blasting treatment, wherein the air pressure of the sand blasting treatment is 0.1MPa, the distance between the spray gun and a workpiece is 50mm, the surface sand and floating ash are removed by adopting compressed air blowing until the sand blasting surface is matte and uniform and the roughness is 9-12 mu m, then placing the automatic inclinator guide cylinder subjected to the sand blasting roughening in the sand blasting machine filled with the sand blasting materials, spraying 300# zirconia on the surface of the automatic inclinator guide cylinder by using the air pressure, performing the sand blasting treatment, wherein the air pressure of the sand blasting treatment is 0.5MPa, the distance between the spray gun and the workpiece is 150mm, and the roughness is 8-11 mu m, and the surface sand blasting materials and the floating ash are removed by adopting compressed air blowing;
fixing the automatic inclinator guide cylinder subjected to surface treatment obtained in the step two on a rotating table of supersonic flame spraying by utilizing a tool, then holding a spray gun of the supersonic flame spraying by an ABB manipulator, and spraying a NiCrAl coating on the surface of the automatic inclinator guide cylinder by adopting the supersonic flame, wherein the technological parameters are as follows: oxygen flow 18m 3 And (3) spraying 3 times, wherein the kerosene flow is 24L/h, the powder feeding amount is 1kg/h, the spraying distance is 300mm, the moving speed of a spray gun is 100mm/min, the step distance of the spray gun is 6mm, after the automatic inclinator guide tube is cooled to room temperature, the spray gun is continuously adopted to spray WC-12Co coating by supersonic flame, and the technological parameters are as follows: oxygen flow 24m 3 And (3) carrying out spraying 6 times, namely forming a hard coating on the surface of the automatic inclinator guide cylinder, and taking down after the automatic inclinator guide cylinder is cooled to room temperature, wherein the kerosene flow is 16L/h, the powder feeding amount is 1kg/h, the spraying distance is 150mm, the moving speed of the spray gun is 100mm/min, the step distance of the spray gun is 6mm.
The above description is only of the preferred embodiments of the present invention, and is not intended to limit the present invention. Any simple modification, variation and equivalent variation of the above embodiments according to the technical substance of the invention still fall within the scope of the technical solution of the invention.
Claims (5)
1. A preparation method of a hard coating for improving fatigue of an automatic inclinator guide cylinder is characterized by comprising the following steps:
step one, cleaning and preprocessing an automatic inclinator guide cylinder;
placing the automatic inclinator guide cylinder subjected to the cleaning pretreatment in the step one into a sand blasting machine filled with sand blasting materials, spraying the sand blasting materials onto the surface of the automatic inclinator guide cylinder by using air pressure to perform sand blasting treatment, then placing the automatic inclinator guide cylinder subjected to sand blasting roughening into the sand blasting machine filled with the sand blasting materials, and spraying the sand blasting materials onto the surface of the automatic inclinator guide cylinder by using air pressure to perform shot blasting treatment to obtain the automatic inclinator guide cylinder subjected to surface treatment;
fixing the automatic inclinator guide cylinder obtained in the step two after surface treatment on a rotating table of supersonic flame spraying, then spraying a NiCrAl coating by adopting supersonic flame, and then spraying a WC-Co coating by adopting supersonic flame to form a hard coating on the surface of the automatic inclinator guide cylinder.
2. The method for preparing a hard coating for improving fatigue of an automatic recliner guide cylinder as set forth in claim 1, wherein in the step one, the automatic recliner guide cylinder is made of aluminum alloy.
3. The method for preparing a hard coating for improving fatigue of an automatic recliner guide cylinder according to claim 1, wherein the cleaning pretreatment comprises the following steps: immersing the automatic inclinator guide cylinder in a container containing a metal cleaning agent solution with the mass concentration of 0.5% -1% at 20-30 ℃ for ultrasonic cleaning for 5-20 min in an ultrasonic generator, flushing under flowing water after removal, immersing in the container containing absolute ethyl alcohol, ultrasonic cleaning for 5-10 min in the ultrasonic generator, and drying by a blower.
4. The method for preparing a hard coating for improving fatigue of an automatic inclinator guide cylinder according to claim 1, wherein the air pressure of the sand blasting treatment in the second step is 0.1-0.6 MPa, and the distance between a spray gun and a workpiece is 50-150 mm; the air pressure of the shot blasting treatment is 0.1-0.5 MPa, and the distance between the spray gun and the workpiece is 50-150 mm.
5. The method for preparing a hard coating for improving fatigue of an automatic inclinator guide tube according to claim 1, wherein the technological parameters of the supersonic flame spraying nicralcoating in the third step are as follows: oxygen flow 18m 3 /h～24m 3 The flow rate of kerosene is 16L/h-24L/h, the powder feeding amount is 1 kg/h-10 kg/h, the spray distance is 150 mm-350 mm, the moving speed of a spray gun is 100 mm/min-600 mm/min, and the step distance of the spray gun is 1 mm-6 mm; the technological parameters of the supersonic flame spraying WC-Co coating are as follows: oxygen flow 18m 3 /h～24m 3 And/h, the flow rate of kerosene is 16-24L/h, the powder feeding amount is 1-10 kg/h, the spray distance is 150-350 mm, the moving speed of the spray gun is 100-600 mm/min, and the step distance of the spray gun is 1-6 mm.
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