CN116121688A - Method for spraying abrasion-resistant coating on casing body - Google Patents

Method for spraying abrasion-resistant coating on casing body Download PDF

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Publication number
CN116121688A
CN116121688A CN202310159324.9A CN202310159324A CN116121688A CN 116121688 A CN116121688 A CN 116121688A CN 202310159324 A CN202310159324 A CN 202310159324A CN 116121688 A CN116121688 A CN 116121688A
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Prior art keywords
spraying
inner hole
casing
casing body
coating
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Chinese (zh)
Inventor
徐丽萍
黄科
曾威
戴红亮
宋进兵
杨焜
张小锋
毛杰
邓春明
邓畅光
刘敏
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Institute of New Materials of Guangdong Academy of Sciences
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Institute of New Materials of Guangdong Academy of Sciences
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Priority to CN202310159324.9A priority Critical patent/CN116121688A/en
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
    • C23C4/129—Flame spraying
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
    • C23C4/06—Metallic material
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
    • C23C4/06—Metallic material
    • C23C4/073—Metallic material containing MCrAl or MCrAlY alloys, where M is nickel, cobalt or iron, with or without non-metal elements

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

The invention belongs to the technical field of coating spraying, and particularly relates to a method for spraying an abrasion-resistant coating on a casing body. The method of the invention comprises the following steps: (1) cleaning a cartridge receiver body to be sprayed and drying; (2) sand blasting coarsening is carried out on the inner wall of the inner hole of the casing body; (3) And rotating the casing body by utilizing the rotary table, and simultaneously carrying out supersonic flame spraying on the inner wall of the inner hole after sand blasting coarsening to obtain the wear-resistant coating coated on the inner wall of the inner hole. According to the method provided by the invention, the wear-resistant coating is formed on the inner wall of the inner hole of the casing body, so that the temperature fluctuation is smaller and the vibration level fluctuation is smaller when the machined casing body is used for an aeroengine; the method not only forms the abrasion-resistant coating on the inner hole of the casing body, but also can repair the damaged or invalid coating on the casing body, and prolongs the service life of the casing body, thereby effectively reducing the waste and the economic cost.

Description

Method for spraying abrasion-resistant coating on casing body
Technical Field
The invention belongs to the technical field of coating spraying, and relates to a method for spraying an abrasion-resistant coating on a casing body.
Background
The accessory casing of the aeroengine is one of important components of the engine and plays a role in installing and driving accessories. The accessory case mainly comprises a gear, a bearing and a shell. The casing is designed with different sized holes for mounting various bearings or shafts. According to different designs, some are assembled by adopting a bearing and a bearing hole, and other are assembled by adopting a shaft neck and a shaft neck supporting hole directly without adopting a bearing. When the casing works, the bearing hole wall or the journal supporting hole wall bear various complex loads and finally lead to abrasion failure. Because the accessory case shell is mostly made of aluminum alloy materials, and the abrasion resistance of the aluminum alloy is poor, surface treatment is required for improving the abrasion resistance of the bearing hole wall or the journal supporting hole wall.
The current common method is to carry out anodic oxidation on the whole aluminum alloy casing body, and form an anodic oxidation film on the surface of the casing body to improve the abrasion resistance. However, the anodic oxide film has high brittleness and is difficult to repair after the film layer is damaged, so that the casing body is directly scrapped after the film layer is damaged or fails, and great economic loss is caused.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method for spraying an abrasion-resistant coating on a casing body.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
in a first aspect, the invention provides a method for spraying an antiwear coating on a casing body, comprising the following steps:
(1) Cleaning a cartridge receiver body to be sprayed and drying;
(2) Sand blasting coarsening is carried out on the inner wall of the inner hole of the casing body;
(3) Rotating the casing body by utilizing a turntable, and simultaneously carrying out supersonic flame spraying on the inner wall of the inner hole after sand blasting coarsening to obtain an abrasion-resistant coating coated on the inner wall of the inner hole; the conditions of the supersonic flame spraying include: the flow rate of kerosene is 10-30L/h, the flow rate of oxygen is 800-1000L/min, the spraying distance is 200-400mm, and the powder feeding rate is 20-40g/min.
Compared with the prior art, the method provided by the invention forms the wear-resistant coating on the inner wall of the inner hole of the casing body, so that the temperature fluctuation of the machined casing body is smaller and the vibration level fluctuation is smaller when the machined casing body is used for an aeroengine. The method not only forms the abrasion-resistant coating on the inner hole of the casing body, but also can repair the damaged or invalid coating of the casing body, and prolongs the service life of the casing body, thereby effectively reducing the waste and the economic cost.
According to the research, the invention needs to control the kerosene flow and the oxygen flow within the proper ranges, and if the oxygen flow is within the range and the kerosene flow is more than 30L/h, or the kerosene flow is within the range and the oxygen flow is less than 800L/min, the kerosene combustion is insufficient, so that carbon deposition occurs in the coating, and finally, the quality of the coating, the wear resistance and other performances are influenced. If the kerosene flow is in the range and the oxygen flow is more than 1000L/min, the spraying powder is excessively melted, and the coating is unevenly and densely coated, so that the performance of the coating is affected.
As a preferred embodiment of the present invention, the conditions of the supersonic flame spraying further include: the spraying angle is 30-41 degrees, and the flame flow center of the spray gun is lower than the upper end surface of the inner hole and higher than 1/2 hole depth of the inner hole.
In the spraying process, the spraying angle must be controlled to be 30-41 degrees, the flame flow center of the spray gun must be controlled to be lower than the upper end face of the inner hole and higher than the position of 1/2 hole depth of the inner hole, otherwise, the uniformity of the thickness of the coating formed on the inner wall of the inner hole is poor, namely, the coating near the bottom of the inner hole is thick, and the coating near the upper end face is thin. The spraying angle and the flame flow center of the spray gun meet the conditions, so that the requirements of post-processing of the coating can be met, and the minimum thickness of the coating on the inner wall has enough processing allowance; if the spraying angle does not meet the above conditions, the coating near the bottom of the inner hole is thicker and the coating quality is poorer, for example, more pores and inclusions exist in the coating, thereby seriously affecting the quality and performance of the coating, and even leading to unsatisfactory coating quality.
In the invention, the spraying angle refers to an included angle between the central axis of the spray gun outlet and a vertical plane.
As a preferred embodiment of the present invention, the step (1) specifically includes: and (3) carrying out ultrasonic cleaning on the casing body to remove grease and dust on the surface of the casing body, and then drying.
As a preferred embodiment of the present invention, the step (2) further includes: and (5) protecting the non-spraying part of the casing body by using an adhesive tape. The step can effectively prevent the flame flow of the spray gun from damaging the non-spraying part of the casing body during spraying.
As a preferred embodiment of the present invention, the step (2) uses sand-blasting sand to perform sand-blasting roughening on the inner wall of the inner hole of the casing body, and uses compressed air to blow off residual sand and dust after sand blasting; the sand blasting sand grain is zirconia corundum, and the sand blasting coarsening conditions are as follows: the sand blasting pressure is 0.2-0.5MPa, the sand blasting angle is 45-75 degrees, and the sand blasting distance is 100-200 mu m; the surface roughness of the inner wall of the inner hole is not less than 4 mu m after sand blasting coarsening.
In the invention, the sand blasting angle refers to an included angle between a central axis of a sand blasting opening and a vertical plane.
As a preferred embodiment of the present invention, the rotation speed of the turntable in the step (3) is 50 110r/min.
It has been found that the rotation speed of the turntable and the rate of powder feeding together affect the formation of the coating. The powder feeding speed is controlled to be 20-40g/min, and meanwhile, the rotating speed of the rotary table is controlled to be 50 110r/min, so that the thickness of a coating formed on the inner wall of the inner hole is uniform. If the powder feeding speed is not in the range, the rotating speed of the rotary table is not in the range, and the thickness of the coating coated on the inner wall of the inner hole is uneven.
In the step (3), before the supersonic flame spraying, the casing is placed on the turntable, the position of the casing is adjusted so that the central axis of the inner hole to be sprayed is on the same straight line with the rotation axis of the turntable, then the casing is fixed, the balancing weight is placed on the turntable, the position of the balancing weight is adjusted, and then the balancing weight is locked, so that the casing can rotate stably along with the turntable.
As a preferred embodiment of the present invention, in the step (3), the inner wall of the inner hole is preheated to 70-110 ℃ before the supersonic flame spraying is performed; during supersonic flame spraying, compressed air is used for cooling the inner hole, an infrared thermometer is used for monitoring the temperature of the inner hole, and the temperature of the inner hole is controlled to be not higher than 160 ℃.
As a preferred embodiment of the invention, the spray powder used for the supersonic flame spraying is at least one of aluminum bronze powder and MCrAlY powder, and the particle size of the spray powder is 15-50 mu m.
As a preferred embodiment of the invention, the inner diameter of the inner hole is 37-38mm, the bottom end of the inner wall to be sprayed of the inner hole is 8-10mm away from the upper end face of the inner hole, and the bottom end of the inner wall to be sprayed of the inner hole is 24-36mm away from the upper end face of the casing body.
In a preferred embodiment of the present invention, the casing is a casing of an aeroengine, and the casing is made of cast aluminum alloy.
Compared with the prior art, the invention has the beneficial effects that:
(1) According to the method provided by the invention, the wear-resistant coating is sprayed on the inner wall of the inner hole of the casing body, so that the temperature fluctuation is smaller and the vibration level fluctuation is smaller when the machined casing body is used for an aeroengine;
(2) The method not only forms the abrasion-resistant coating on the inner hole of the casing body, but also can repair the damaged or invalid coating on the casing body, and prolongs the service life of the casing body, thereby effectively reducing the waste and the economic cost.
Drawings
Fig. 1 is a schematic structural diagram of a casing provided by the present invention;
FIG. 2 is a schematic diagram of the installation of a casing, a counterweight and a turntable according to the present invention;
FIG. 3 is a topography of an aluminum bronze coating on a casing provided by the present invention;
FIG. 4 is a topography of a NiCoCrAlYTA coating on a receiver body provided by the invention;
FIG. 5 is a graph showing the relationship between the rack check temperature, load and oil supply temperature of a casing with an anodic oxide film over time;
FIG. 6 is a graph of the relationship between the rotational speed of a bench test with an anodic oxide film casing and the vibration of the test system over time;
FIG. 7 is a graph of bench assessment temperature, load, and oil supply temperature over time for a casing with an aluminum bronze coating;
FIG. 8 is a graph of bench assessment rotational speed and test system vibration versus time for a case with an aluminum bronze coating.
Detailed Description
For a better description of the objects, technical solutions and advantages of the present invention, the present invention will be further described with reference to the following specific examples. It will be appreciated by persons skilled in the art that the specific embodiments described herein are for purposes of illustration only and are not intended to be limiting.
The reagents, methods and apparatus employed in the present invention, unless otherwise specified, are all conventional in the art.
The structure of the turntable 1 and the balancing weight 2 adopted by the invention is shown in figure 2. The turntable 1 adopted by the invention comprises a frame 11, wherein a machine case 12 and a turntable 13 are arranged on the frame 11, a rotating motor is arranged in the machine case 12, the machine case 12 is fixedly connected with the frame 11, an output section of the rotating motor is connected with a rotating shaft, one end of the rotating shaft extends out of the machine case 12 and is fixedly connected with the turntable 13, the rotating shaft drives the turntable 13 to rotate under the driving of the rotating motor, and a plurality of grooves and a plurality of anti-skid lines are arranged on the upper surface of the turntable 1; be provided with the screw hole on the balancing weight 2, during the assembly, select with the bolt of screw hole adaptation, with the bolt screw in the screw hole to insert in the recess of revolving stage 1, screw the nut can fix balancing weight 2, will balancing weight 2 locking.
Example 1
The embodiment provides a method for spraying an abrasion-resistant coating on a casing body, which comprises the following steps:
(1) The method comprises the steps of preparing a casing body, wherein the casing body is of a structure shown in figure 1, the casing body is of an aeroengine casing body, the casing body is made of cast aluminum alloy, the casing body is provided with three inner holes, the inner diameter of each inner hole is 37-38mm, the bottom end of an inner wall to be sprayed of each inner hole is 8-10mm away from the upper end face of each inner hole, and the bottom end of the inner wall to be sprayed of each inner hole is 24-36mm away from the upper end face of the casing body. And (3) carrying out ultrasonic cleaning on the casing body to remove grease and dust on the surface of the casing body, and then drying.
(2) Protecting a non-spraying part of the casing body by using an adhesive tape, adopting sand blasting sand grains to perform sand blasting coarsening on the inner wall of an inner hole of the casing body, and blowing off residual sand grains and dust by using compressed air after sand blasting; the sand blasting sand grain is 46# zirconia corundum, and the sand blasting coarsening conditions are as follows: the sand blasting pressure is 0.35MPa, the sand blasting angle is 60 degrees, and the sand blasting distance is 150 mu m; the surface roughness of the inner wall of the inner hole is not less than 4 mu m after sand blasting coarsening.
(3) Before supersonic flame spraying, placing a casing body on the turntable 1, adjusting the position of the casing body to enable the central axis of an inner hole to be sprayed and the rotation axis of the turntable 1 to be in the same straight line, then fixing the casing body, installing the balancing weight 2 on the turntable 1, adjusting the position of the balancing weight 2, enabling the casing body to stably rotate along with the turntable 1, locking the balancing weight 2, and installing the casing body on the turntable in a schematic diagram shown in fig. 2.
(3) And (3) rotating the casing body by using a rotary table, wherein the rotating speed of the rotary table is 64r/min, and preheating the inner wall of the inner hole to 70-110 ℃.
(4) Maintaining the rotating speed of the turntable 1, and performing supersonic flame spraying on the inner wall of the inner hole after sand blasting coarsening to obtain an aluminum bronze coating coated on the inner wall of the inner hole; when supersonic flame spraying is carried out, compressed air is used for cooling the inner hole, an infrared thermometer is used for monitoring the temperature of the inner hole, and the temperature of the inner hole is controlled to be not more than 160 ℃; the conditions of the supersonic flame spraying are as follows: the flow rate of kerosene is 20L/h, the flow rate of oxygen is 900L/min, the spraying distance is 300mm, the powder feeding rate is 30g/min, the spraying angle is 35 degrees, and the position of the flame flow center of the spray gun is lower than the upper end surface of the inner hole and higher than 1/2 hole depth of the inner hole; the spray powder adopted by the supersonic flame spraying is aluminum bronze powder, and the particle size of the spray powder is 15-45 mu m.
Example 2
The difference between the method of spraying the abrasion-resistant coating on the casing body and the method of spraying the abrasion-resistant coating on the casing body is that the spraying powder adopted in the embodiment is NiCoCrAlYTA powder, and the coating on the inner wall of the inner hole is NiCoCrAlYTA coating.
Effect example 1
The morphology of the coating on the receiver body after spraying in examples 1-2 was tested, and the test results are shown in fig. 3-4.
The test results showed that the coating was successfully formed on the inner wall of the bore of the casing by the method of examples 1-2, and post-processed to final dimensions. The coating of example 1 has a thickness in the range of 200-220 μm with a thickness difference of only 20 μm; the coating of example 2 had a thickness in the range of 185-196 μm with a thickness difference of only 11 μm.
Processing the inner bore of the casing body simulator according to the method of example 1 to obtain a simulator with an aluminum bronze coating; the inner bore of the case simulator was treated in the same manner as in example 2 to obtain a simulator with NiCoCrAlYTa coating, and the aluminum bronze coated simulator, the NiCoCrAlYTa coated simulator and the conventional simulator with anodic oxide film were mounted on a bench for bench examination, and the appearance of the inner bore of the simulator was visually examined before and after the bench examination, which was required as shown in table 1 below.
Table 1 bench assessment requirements
Figure BDA0004093582650000061
Visual inspection results show that the inner hole with the aluminum bronze coating and the inner hole with the NiCoCrAlYTA coating are free of any abnormality after bench examination, which indicates that the uniform and compact coating is formed by spraying, and the coating has good abrasion resistance.
The examination results are shown in fig. 5-8, which show that the temperature fluctuation amplitude and vibration level fluctuation amplitude of the simulation piece with aluminum bronze coating and the simulation piece with NiCoCrAlYTa coating are smaller than those of the simulation piece with anodic oxide film, which indicates that the heat conductivity of the aluminum bronze coating and NiCoCrAlYTa coating is better than those of the anodic oxide film.
Example 3
The present embodiment provides a method for spraying an abrasion-resistant coating on a casing, which is different from embodiment 1 in that the sandblasting and roughening conditions in this embodiment are as follows: the sand blasting pressure is 0.5MPa, the sand blasting angle is 75 degrees, and the sand blasting distance is 200 mu m; the surface roughness of the inner wall of the inner hole is about 6.8 mu m after sand blasting coarsening; the conditions of the supersonic flame spraying are as follows: the flow rate of kerosene is 10L/h, the flow rate of oxygen is 800L/min, the spraying distance is 200mm, the powder feeding rate is 20g/min, the spraying angle is 30 degrees, the position of the flame flow center of the spray gun is lower than the upper end surface of the inner hole and higher than 1/2 hole depth of the inner hole; the rotating speed of the rotary table is 50r/min.
Example 4
The present embodiment provides a method for spraying an abrasion-resistant coating on a casing, which is different from embodiment 1 in that the sandblasting and roughening conditions in this embodiment are as follows: the sand blasting pressure is 0.2MPa, the sand blasting angle is 45 degrees, and the sand blasting distance is 100 mu m; the surface roughness of the inner wall of the inner hole is about 4.2 mu m after sand blasting coarsening; the conditions of the supersonic flame spraying are as follows: the flow rate of kerosene is 30L/h, the flow rate of oxygen is 1000L/min, the spraying distance is 400mm, the powder feeding rate is 40g/min, the spraying angle is 41 degrees, the position of the flame flow center of the spray gun is lower than the upper end surface of the inner hole and higher than 1/2 hole depth of the inner hole; the rotating speed of the rotary table is 110r/min.
Effect example 2
The coated cases of examples 3-4 were post-processed to final dimensions and the morphology of the coating was tested.
The morphology test result shows that the thickness of the coating on the simulation piece treated by the method of the embodiment 3 is 160-180 mu m, and the thickness difference is only 20 mu m; the thickness of the coating on the simulated part treated by the method of example 4 is 175-192 μm, and the thickness difference is only 17 μm;
processing the simulation of the casing body according to the method of example 3 to obtain a simulation; the simulators of the casing were processed in the method of example 4 to obtain simulators, and the morphology test and bench assessment were performed on the simulators 1 and 2 in the method of effect example 1.
Visual inspection results show that the inner hole coating of the simulation piece treated by the method of the embodiment 3-4 has no abnormality before and after bench examination, which indicates that the coating is uniformly and densely formed by spraying and has good abrasion resistance.
The bench examination result shows that the fluctuation amplitude of the temperature and the fluctuation amplitude of the vibration level are sequentially from large to small: example 4 method treated simulants > example 3 method treated simulants > example 1 method treated simulants.
Comparative example 1
The comparative example provides a method of spraying a coating on a casing body, and is different from example 1 in that the comparative example controls the powder feeding rate to 50g/min and simultaneously controls the rotation speed of the turntable to 40r/min.
The topography test shows that the thickness distribution of the coating formed by the comparative example is uneven, and the thickness difference is more than 50 mu m.
The inner hole of the casing body simulator was treated according to the method of this comparative example, and then a bench test was performed according to the method of effect example 1, and after the bench test, it was found that cracking occurred in the inner hole coating, which means that the thickness difference of the coating was too large, and the wear resistance of the coating was affected.
Comparative example 2
This comparative example provides a method of spraying a coating on a receiver body, and differs from example 1 in that this comparative example controls the oxygen flow rate at 1200L/min.
The topography test shows that the thickness difference of the coating formed by the comparative example is less than 20 mu m.
The inner hole of the casing body simulation member is treated according to the method of the comparative example, then a bench test is carried out according to the method of the effect example 1, and the inner hole coating is found to have cracks after the bench test, which is probably due to the excessive oxygen flow, the over-melting phenomenon occurs, the coating is not uniform and compact in the forming process, and the wear resistance of the coating is affected.
Comparative example 3
This comparative example provides a method of spraying a coating on a casing body, and differs from example 1 in that this comparative example controls the flow rate of kerosene at 40L/h.
The difference in thickness of the coating formed in this comparative example was found to be about 26 μm by morphological testing.
The inner hole of the case body simulator was treated according to the method of this comparative example, and then a bench test was performed according to the method of effect example 1, and after the bench test, it was found that cracks occurred in the coating, probably due to excessive kerosene flow, insufficient kerosene combustion, and a carbon deposition phenomenon occurred in the coating, thereby affecting the wear resistance of the coating.
Comparative example 4
The present comparative example provides a method of spraying a coating on a casing body, which differs from example 1 in that the spray angle of the present comparative example is 25 °, and the spray gun flame flow center is located below the upper end surface of the inner bore and below 1/2 of the bore depth of the inner bore.
The topography test shows that the thickness difference of the coating formed in this comparative example is about 32 μm.
The inner hole of the case body simulator was treated according to the method of this comparative example, and then a bench test was performed according to the method of effect example 1, after which it was found that the coating developed cracks, probably due to the excessive thickness of the coating at the bottom of the inner hole, and more voids and inclusions were present in the coating, thereby severely affecting the coating quality and performance.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted equally without departing from the spirit and scope of the technical solution of the present invention.

Claims (10)

1. A method for spraying an antiwear coating on a casing body, comprising the following steps:
(1) Cleaning a cartridge receiver body to be sprayed and drying;
(2) Sand blasting coarsening is carried out on the inner wall of the inner hole of the casing body;
(3) Rotating the casing body by utilizing a turntable, and simultaneously carrying out supersonic flame spraying on the inner wall of the inner hole after sand blasting coarsening to obtain an abrasion-resistant coating coated on the inner wall of the inner hole; the conditions of the supersonic flame spraying include: the flow rate of kerosene is 10-30L/h, the flow rate of oxygen is 800-1000L/min, the spraying distance is 200-400mm, and the powder feeding rate is 20-40g/min.
2. The method for spraying an abrasion-resistant coating on a casing according to claim 1, wherein the step (1) specifically comprises: and (3) carrying out ultrasonic cleaning on the casing body to remove grease and dust on the surface of the casing body, and then drying.
3. The method of spraying an anti-wear coating on a receiver body of claim 1, wherein the supersonic flame-spraying conditions further comprise: the spraying angle is 30-41 degrees, and the flame flow center of the spray gun is lower than the upper end surface of the inner hole and higher than 1/2 hole depth of the inner hole.
4. The method for spraying the abrasion-resistant coating on the casing body according to claim 1, wherein the step (2) adopts sand blasting sand grains to perform sand blasting roughening on the inner wall of the inner hole of the casing body, and residual sand grains and dust are blown off by compressed air after sand blasting; the sand blasting sand grain is zirconia corundum, and the sand blasting coarsening conditions are as follows: the sand blasting pressure is 0.2-0.5MPa, the sand blasting angle is 45-75 degrees, and the sand blasting distance is 100-200 mu m; the surface roughness of the inner wall of the inner hole is not less than 4 mu m after sand blasting coarsening.
5. The method for spraying an abrasion-resistant coating on a casing according to claim 1, wherein the rotation speed of the turntable in the step (3) is 50 110r/min.
6. The method for spraying the abrasion-resistant coating on the casing according to claim 1, wherein in the step (3), before the supersonic flame spraying is performed, the casing is placed on a turntable, the position of the casing is adjusted so that the central axis of an inner hole to be sprayed is in the same line with the rotation axis of the turntable, then the casing is fixed, a balancing weight is placed on the turntable, the position of the balancing weight is adjusted, and then the balancing weight is locked, so that the casing can rotate stably along with the turntable.
7. The method of spraying an abrasion-resistant coating onto a receiver body according to claim 1, wherein in step (3), the inner wall of the inner bore is preheated to 70-110 ℃ prior to the supersonic flame spraying; during supersonic flame spraying, compressed air is used for cooling the inner hole, an infrared thermometer is used for monitoring the temperature of the inner hole, and the temperature of the inner hole is controlled to be not higher than 160 ℃.
8. The method for spraying an abrasion-resistant coating on a casing body according to claim 1, wherein the spray powder used for the supersonic flame spraying is at least one of aluminum bronze powder and MCrAlY powder, and the particle size of the spray powder is 15-50 μm.
9. The method for spraying an abrasion-resistant coating on a casing according to claim 1, wherein the inner diameter of the inner hole is 37-38mm, the bottom end of the inner wall to be sprayed of the inner hole is 8-10mm from the upper end face of the inner hole, and the bottom end of the inner wall to be sprayed of the inner hole is 24-36mm from the upper end face of the casing.
10. The method for spraying an antiwear coating on a casing according to claim 1, wherein said casing is a casing of an aeroengine, and said casing is made of cast aluminum alloy.
CN202310159324.9A 2023-02-22 2023-02-22 Method for spraying abrasion-resistant coating on casing body Pending CN116121688A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109055883A (en) * 2018-10-25 2018-12-21 广东省新材料研究所 Methods and applications of the aluminum alloy casing with boss inner wall local plasma spraying NiCrAlY coating
CN109321859A (en) * 2018-11-27 2019-02-12 广东省新材料研究所 A kind of metal surface pre-treating method
CN112662979A (en) * 2020-12-11 2021-04-16 广东省科学院新材料研究所 Method for spraying inner hole coating by supersonic flame
CN113969388A (en) * 2021-09-18 2022-01-25 中国航发南方工业有限公司 Preparation method of wear-resistant coating on inner surface of part with large depth-diameter ratio

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109055883A (en) * 2018-10-25 2018-12-21 广东省新材料研究所 Methods and applications of the aluminum alloy casing with boss inner wall local plasma spraying NiCrAlY coating
CN109321859A (en) * 2018-11-27 2019-02-12 广东省新材料研究所 A kind of metal surface pre-treating method
CN112662979A (en) * 2020-12-11 2021-04-16 广东省科学院新材料研究所 Method for spraying inner hole coating by supersonic flame
CN113969388A (en) * 2021-09-18 2022-01-25 中国航发南方工业有限公司 Preparation method of wear-resistant coating on inner surface of part with large depth-diameter ratio

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