Preparation method for improving coating effect of composite powder

Abstract

The invention discloses a preparation method for improving the coating effect of composite powder, a workbench is included, a drying oven is installed at the inner end of the workbench, when the preparation method is used, 500 g of spherical Al2O3 powder with the particle size being 300-500 meshes is injected into a stirring tank, meanwhile 500 ml of concentrated HCL is slowly poured into the stirring tank, the stirring tank is sealed, and the coating effect of the composite powder is improved. Then a gear shaft motor is started and controlled to drive a tension stirrer connected with a middle gear shaft to slowly stir for 10-15 minutes in the stirring tank to fully react, and then one side of a pressure lever plate is pressed downwards to drive a connecting rod plug to move upwards, so that a mixed solution in the stirring tank is downwards poured into a funnel through an opening in the bottom of the stirring tank; powder in the solution can be filtered out through filter paper arranged in the funnel, ionized water can be injected from the upper end of the stirring tank to thoroughly wash the solution in the stirring tank, meanwhile, deionized water can be released for multiple times to wash the powder in the filter paper for four to five times, and the effect of rapidly extracting Al2O3 powder with uneven gullies on the surface is achieved; and the cohesiveness of the coated powder is improved.

Description

Technical Field

[0001] The invention relates to the technical field of material preparation, in particular to a preparation method for improving the coating effect of composite powder. Background Art

[0002] Thermal spraying refers to heating the coating powder or wire to a molten or semi-molten state, and spraying it on the substrate surface using a high-speed airflow to achieve a protective effect. Common powder preparation processes include agglomeration and sintering, sintering crushing, melting crushing, water atomization, gas atomization, mechanical coating, chemical coating and other methods. For Al2O3-3%TiO2 (AT3) powder, the melting crushing method is the most common process. Its advantages are simple process and easy manufacturing, but its disadvantages are also obvious. The powder morphology after crushing is irregular, which seriously affects the fluidity of the powder, resulting in uneven organization of the final coating and increased defects such as porosity. Therefore, we need a preparation method to improve the coating effect of composite powder.

[0003] However, the currently used preparation method for improving the coating effect of composite powders cannot improve the adhesion of the coating powder during the operation of the equipment, and cannot make the prepared coating have better insulation performance. Summary of the invention

[0004] The object of the present invention is to provide a preparation method for improving the coating effect of composite powders, so as to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A preparation method for improving the coating effect of composite powder, comprising a workbench, an oven is installed at the inner end of the workbench, a magnetic stirrer is installed at the upper end of the workbench, a horizontal ball mill is installed at the upper end of the workbench, a stirring tank is installed at the upper end of the workbench, a bearing hole is opened at the upper end of the stirring tank, a pressure lever plate is installed at one end of the bearing hole, a tension spring is installed at the lower end of the pressure lever plate, a connecting rod plug is installed at one end of the connecting rod plug, a tension stirrer is installed at one end of the tension stirrer, and a center gear shaft is installed at one end of the tension stirrer A gear shaft motor is installed at one end of the middle gear shaft, a supporting cover plate is installed at the lower end of the gear shaft motor, a limited plate is installed at one end of the supporting cover plate, a top block spring is installed at the lower end of the limited plate, a slide groove is opened at one end of the mixing tank, a supporting plate rotation hole is opened at one end of the mixing tank, a closing cover plate is installed at one end of the supporting plate rotation hole, a card cover rod is installed at one end of the closing cover plate, a limited rod spring is installed at the outer end of the card cover rod, a card slot is opened at one end of the mixing tank, a funnel is installed at one end of the card slot, and a water collecting cylinder is installed at one end of the mixing tank.

[0007] Preferably, the oven is movably connected to the workbench, and the horizontal ball mill is threadedly connected to the workbench.

[0008] Preferably, the pressure lever plate forms a rotating structure with the stirring tank through the rotation hole, and the connecting rod plug is movably connected to the stirring tank through the pressure lever plate.

[0009] Preferably, the tension stirrer forms a rotating structure through the center gear shaft and the supporting cover plate, and the inner end diameter of the tension stirrer is larger than the outer end diameter of the connecting rod plug.

[0010] Preferably, the limiting plate is engaged and connected with the supporting cover plate through a top block spring, and the limiting plate forms a sliding structure with the stirring tank through a slide groove.

[0011] Preferably, the closing cover plate forms a rotating structure with the stirring tank through the support plate rotation hole, and the cover clamping rod is connected with the closing cover plate through a rod limiting spring.

[0012] Preferably, the funnel is snap-connected to the stirring tank via a slot, and the water receiving cylinder is movably connected to the stirring tank.

[0013] A preparation method and use method for improving the coating effect of composite powder, comprising the following steps:

[0014] S1. Inject 500g of spherical Al2O3 powder with a particle size of 300-500 mesh into the stirring tank, and slowly pour 500ml of concentrated HCL into it, then start and control the gear shaft motor to drive the tension stirrer connected to the middle gear shaft to slowly stir in the stirring tank for ten to fifteen minutes to allow it to react fully;

[0015] S2. Move the limit plate downward in the chute, operate the bearing cover plate to rotate in the bearing plate rotation hole to the direction that does not contact the stirring position of the mixing tank, press down one side of the pressure lever plate, make it rotate counterclockwise on the mixing tank through the bearing rotation hole, so as to drive the connecting rod plug to move upward, so that the bottom of the mixing tank is opened, and the mixed liquid in the mixing tank is poured downward into the funnel, and the powder in the solution is filtered out through the filter paper set in the funnel, and deionized water can be injected from the upper end of the mixing tank, so that the solution in the mixing tank can be thoroughly flushed, and deionized water can be released multiple times to rinse the powder in the filter paper four to five times;

[0016] S3, adding 97wt.%-Al2O3 and 3wt.%-TiO2 powders into a corundum ball milling jar with a locking device, and placing it on a horizontal ball mill for ball milling and mixing, with a ball-to-material ratio of 1:1, a ball mill speed of 160 revolutions per minute, and ball milling for fifteen to thirty minutes;

[0017] S4, the polyvinyl alcohol powder dried for a certain period of time is mixed with distilled water in a ratio of 3wt%:97wt% to prepare an adhesive solution, i.e., a polyvinyl alcohol aqueous solution, and stirred and blended by a magnetic stirrer, and the prepared mixed ball-milled powder is poured into the polyvinyl alcohol aqueous solution, and the mixture is put into a stirring tank, and the closing cover plate is rotated in the rotating hole of the support plate to a position in which it fits with the support cover plate, and the cover-locking rod is engaged with the closing cover plate on the support cover plate by the force of the limit rod spring to prevent the problem of solution overflow during the preparation process, and the tension stirrer is driven by the gear shaft motor to perform rapid stirring and blending, and the stirrer is set to 500rpm for 20 to 30 minutes;

[0018] S5. Finally, the evenly mixed powder slurry is put into an oven and the oven temperature is set to 180 degrees. The water in the slurry and the generated AlCl3 are removed by utilizing the characteristics that AlCl3 is easily soluble in water and sublimates at 178 degrees to obtain a nano-3% TiO2-coated Al2O3-3% TiO2 composite powder. At this time, the nano-powder is evenly coated around the spherical alumina powder to form a "satellite" structure. Then, the commercial melt-crushed AT3 powder and the prepared coated powder can be used to form a thermal spray coating using the same plasma spraying process.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. Using the stirring tank, connecting rod plug and funnel installed in the device, 500g of spherical Al2O3 powder with a particle size of 300-500 mesh is injected into the stirring tank, and 500ml of concentrated HCL is slowly poured in at the same time, and then the gear shaft motor is started and controlled to drive the tension stirrer connected to the middle gear shaft to slowly stir in the stirring tank for ten to fifteen minutes to make it fully react, and then the side of the pressure lever plate is pressed down to drive the connecting rod plug to move upward, so that the bottom of the stirring tank is opened to pour the mixed liquid in the stirring tank downward into the funnel, and the powder in the solution is filtered out through the filter paper set in the funnel, and deionized water can be injected from the upper end of the stirring tank to thoroughly flush the solution in the stirring tank. At the same time, deionized water can be released multiple times to rinse the powder in the filter paper four to five times, so as to achieve the effect of quickly extracting the Al2O3 powder with uneven grooves on the surface, and improve the adhesion of the coated powder.

[0021] 2. Using an oven, a magnetic stirrer, a stirring tank and an oven, prepare 97wt.%-Al2O3 and 3wt.%-TiO2 powders and add them to a corundum ball mill with a locking device for grinding. Then, polyvinyl alcohol powder that has been dried for a certain period of time and distilled water are mixed in a ratio of 3wt%:97wt% to prepare an adhesive solution. The mixed ball mill powder is poured into the polyvinyl alcohol aqueous solution and put into the stirring tank. The tension stirrer is driven by the gear shaft motor to quickly stir and fuse. Finally, the mixture is The uniform powder slurry is put into an oven, and the oven temperature is set to 180 degrees. By utilizing the characteristics of AlCl3 being easily soluble in water and sublimating at 178 degrees, the moisture in the slurry and the generated AlCl3 are removed to obtain nano 3% TiO2-coated Al2O3-3% TiO2 composite powder. At this time, the nano powder is evenly coated around the spherical alumina powder to form a "satellite" structure. Then the commercial melt-crushed AT3 powder and the prepared coated powder can be used, and the same plasma spraying process can be used to form a thermal spray coating, thereby improving the insulation properties of the material. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the vertical front view structure of a preparation method for improving the coating effect of composite powders of the present invention;

[0023] Figure 2 A schematic diagram of a rear-view structure of a preparation method for improving the coating effect of composite powders according to the present invention;

[0024] Figure 3 A schematic cross-sectional view of a stirring tank in a preparation method for improving the coating effect of composite powders according to the present invention;

[0025] Figure 4 Schematic diagram of the disassembled structure of a stirring tank in a preparation method for improving the coating effect of composite powders of the present invention

[0026] Figure 5 The present invention is a preparation method for improving the coating effect of composite powder Figure 2 The enlarged structural diagram at A in the middle;

[0027] Figure 6 The present invention is a preparation method for improving the coating effect of composite powder Figure 3 The enlarged structural diagram at B in the middle;

[0028] In the figure: 1. workbench; 2. oven; 3. magnetic stirrer; 4. horizontal ball mill; 5. mixing tank; 6. bearing hole; 7. pressure lever plate; 8. tension spring; 9. connecting rod plug; 10. tension stirrer; 11. middle gear shaft; 12. gear shaft motor; 13. bearing cover plate; 14. limit plate; 15. top block spring; 16. slide; 17. bearing plate rotation hole; 18. closing cover plate; 19. cover rod; 20. limit rod spring; 21. slot; 22. funnel; 23. water collecting cylinder. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] See also Figure 1-6 The present invention provides a technical solution for a preparation method for improving the coating effect of composite powder:

[0031] A preparation method for improving the coating effect of composite powder, comprising a workbench 1, an oven 2 is installed at the inner end of the workbench 1, a magnetic stirrer 3 is installed at the upper end of the workbench 1, a horizontal ball mill 4 is installed at the upper end of the workbench 1, a stirring tank 5 is installed at the upper end of the workbench 1, a bearing hole 6 is opened at the upper end of the stirring tank 5, a pressure lever plate 7 is installed at one end of the bearing hole 6, a tension spring 8 is installed at the lower end of the pressure lever plate 7, a connecting rod plug 9 is installed at one end of the pressure lever plate 7, a tension stirrer 10 is installed at one end of the connecting rod plug 9, a center gear shaft 11 is installed at one end of the tension stirrer 10, and a center gear shaft 11 is installed at one end of the center gear shaft 11. A gear shaft motor 12 is installed at the end, a support cover plate 13 is installed at the lower end of the gear shaft motor 12, a limited plate 14 is installed at one end of the support cover plate 13, a top block spring 15 is installed at the lower end of the limited plate 14, a slide groove 16 is provided at one end of the mixing tank 5, a support plate rotation hole 17 is provided at one end of the mixing tank 5, a closing cover plate 18 is installed at one end of the support plate rotation hole 17, a card cover rod 19 is installed at one end of the closing cover plate 18, a limited rod spring 20 is installed at the outer end of the card cover rod 19, a card slot 21 is provided at one end of the mixing tank 5, a funnel 22 is installed at one end of the card slot 21, and a water receiving cylinder 23 is installed at one end of the mixing tank 5.

[0032] The oven 2 is movably connected to the workbench 1 , and the horizontal ball mill 4 is threadedly connected to the workbench 1 .

[0033] The pressure lever plate 7 forms a rotating structure with the stirring tank 5 through the rotation hole 6, and the connecting rod plug 9 is movably connected with the stirring tank 5 through the pressure lever plate 7.

[0034] The tension stirrer 10 forms a rotating structure through the center gear shaft 11 and the support cover plate 13, and the inner end diameter of the tension stirrer 10 is larger than the outer end diameter of the connecting rod plug 9.

[0035] The limiting plate 14 is engaged and connected with the supporting cover plate 13 via the top block spring 15 , and the limiting plate 14 forms a sliding structure with the stirring tank 5 via the slide groove 16 .

[0036] The closing cover plate 18 forms a rotating structure with the stirring tank 5 through the support plate rotation hole 17 , and the cover clamping rod 19 is clamped and connected with the closing cover plate 18 through the rod limiting spring 20 .

[0037] The funnel 22 is connected to the stirring tank 5 by means of the clamping groove 21 , and the water receiving tube 23 is movably connected to the stirring tank 5 .

[0038] A preparation method and use method for improving the coating effect of composite powder, comprising the following steps:

[0039] S1, inject 500g of spherical Al2O3 powder with a particle size of 300-500 mesh into the stirring tank 5, and slowly pour 500ml of concentrated HCL, then start and control the gear shaft motor 12 to drive the tension stirrer 10 connected to the middle gear shaft 11 to slowly stir in the stirring tank 5 for ten to fifteen minutes to make it fully react;

[0040] S2, move the limit plate 14 downward in the chute 16, operate the support cover plate 13 to rotate in the support plate rotation hole 17 to the direction that does not contact the stirring position of the stirring tank 5, press down one side of the pressure lever plate 7, so that it rotates counterclockwise on the stirring tank 5 through the support rotation hole 6, thereby driving the connecting rod plug 9 to move upward, so that the bottom of the stirring tank 5 is opened, and the mixed liquid in the stirring tank 5 is poured downward into the funnel 22, and the powder in the solution is filtered out through the filter paper set in the funnel 22, and deionized water can be injected from the upper end of the stirring tank 5, so that the solution in the stirring tank 5 can be thoroughly flushed, and deionized water can be released multiple times to rinse the powder in the filter paper four to five times;

[0041] S3, adding 97wt.%-Al2O3 and 3wt.%-TiO2 powders into a corundum ball milling jar with a locking device, and placing it on a horizontal ball mill 4 for ball milling and mixing, with a ball-to-material ratio of 1:1, a ball mill speed of 160 revolutions per minute, and ball milling for fifteen to thirty minutes;

[0042] S4, the polyvinyl alcohol (PVA) powder dried for a certain period of time is mixed with distilled water in a ratio of 3wt%:97wt% to prepare an adhesive solution, i.e., a polyvinyl alcohol aqueous solution, and the mixture is stirred and blended by a magnetic stirrer 3, and the prepared mixed ball-milled powder is poured into the polyvinyl alcohol aqueous solution, and the mixture is put into a stirring tank 5, and the closing cover plate 18 is rotated in the carrier plate rotation hole 17 to a position in contact with the carrier cover plate 13, and the cover rod 19 is engaged with the closing cover plate 18 on the carrier cover plate 13 by the force of the limit rod spring 20 to prevent the problem of solution overflow during the preparation process, and the tension stirrer 10 is driven by the gear shaft motor 12 to perform rapid stirring and blending, and the stirrer is set to 500rpm for 20 to 30 minutes;

[0043] S5. Finally, the evenly mixed powder slurry is put into oven 2, and the temperature of oven 2 is set to 180°C. By utilizing the characteristics of AlCl3 being easily soluble in water and sublimating at 178 degrees, the moisture in the slurry and the generated AlCl3 are removed to obtain a nano 3% TiO2-coated Al2O3-3% TiO2 composite powder. At this time, the nano powder is evenly coated around the spherical alumina powder to form a "satellite" structure. Then, the commercial melt-crushed AT3 powder and the prepared coated powder can be used to form a thermal spray coating using the same plasma spraying process.

[0044] It should be noted that the present invention is a preparation method for improving the coating effect of composite powder. When in use, first, 500g of spherical Al2O3 powder with a particle size of 300-500 mesh is injected into the stirring tank 5, and 500ml of concentrated HCL is slowly poured in at the same time, and then the gear shaft motor 12 is started and controlled to drive the tension stirrer 10 connected to the middle gear shaft 11 to slowly stir in the stirring tank 5 for ten to fifteen minutes to make it fully react, and the limit plate 14 is moved downward in the slide 16, and the support cover plate 13 is operated to rotate in the support plate rotation hole 17 to a direction that does not contact the stirring position of the stirring tank 5, and one side of the pressure lever plate 7 is pressed downward to make it rotate counterclockwise on the stirring tank 5 through the support rotation hole 6, thereby driving the connecting rod plug 9 to Move upward to open the bottom of the stirring tank 5, pour the mixed solution in the stirring tank 5 downward into the funnel 22, and filter out the powder in the solution through the filter paper set in the funnel 22, and inject deionized water from the upper end of the stirring tank 5, so that the solution in the stirring tank 5 can be thoroughly washed, and deionized water can be released multiple times to rinse the powder in the filter paper four to five times, so as to achieve the effect of quickly extracting the Al2O3 powder with uneven grooves on the surface, and improve the adhesion of the coated powder. After the 97wt.%-Al2O3 and 3wt.%-TiO2 powders are prepared, they are added to the corundum ball mill with a locking device, and placed on the horizontal ball mill 4 for ball milling and mixing. The ball-to-material ratio is 1:1, and the ball mill speed is 16 per minute. 0 revolutions, ball milling lasts for fifteen to thirty minutes, and then the polyvinyl alcohol (PVA) powder dried for a certain period of time is mixed with distilled water in a ratio of 3wt%:97wt% to prepare an adhesive solution, i.e., a polyvinyl alcohol aqueous solution, which is stirred and blended by a magnetic stirrer 3, and the prepared mixed ball-milled powder is poured into the polyvinyl alcohol aqueous solution, and is put into a stirring tank 5, and the closing cover plate 18 is rotated in the carrier plate rotation hole 17 to a position in which it fits with the carrier cover plate 13, and the cover rod 19 is engaged with the closing cover plate 18 on the carrier cover plate 13 through the force of the limit rod spring 20 to prevent the problem of solution overflow during the preparation process, and the tension stirrer 10 is driven by the gear shaft motor 12 to perform rapid stirring and blending work, and the tension stirrer 10 is set to 500rpm for 20 to 30 minutes. Finally, the mixed powder slurry is placed in oven 2, and the temperature of oven 2 is set to 180 degrees. By using the characteristics of AlCl3 being easily soluble in water and sublimating at 178 degrees, the moisture in the slurry and the generated AlO3 are removed to obtain a nano-3% TiO2-coated Al2O3-3% TiO2 composite powder. At this time, the nano-powder is evenly coated around the spherical alumina powder to form a "satellite" structure. Then, the commercial melt-crushed AT3 powder and the prepared coated powder can be used to form a thermal spray coating using the same plasma spraying process. After testing, the stable α-Al2O3 phase in the coating accounts for 18.3% and 39.3%, which shows that the Al2O3-3%TiO2 composite powder prepared by the coating method retains more α-Al2O3 during spraying, and the outer coated TiO2 absorbs part of the heat. The insulation resistance under DC1000V is 0.093MΩ and 1.403GΩ respectively, and the capacitance test results are 0.300nF and 72.5pF respectively. It can be seen that the mechanically coated powder coating has higher resistance and lower capacitance under the same conditions, so the insulation performance is better. In this way, a preparation method for improving the coating effect of composite powder is completed. .

[0045] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A preparation method for improving the coating effect of composite powder, characterized in that: The invention comprises a workbench (1), wherein an oven (2) is installed at the inner end of the workbench (1), a magnetic stirrer (3) is installed at the upper end of the workbench (1), a horizontal ball mill (4) is installed at the upper end of the workbench (1), a stirring tank (5) is installed at the upper end of the workbench (1), a rotation hole (6) is opened at the upper end of the stirring tank (5), a pressure lever plate (7) is installed at one end of the rotation hole (6), a tension spring (8) is installed at the lower end of the pressure lever plate (7), a connecting rod plug (9) is installed at one end of the pressure lever plate (7), a tension stirrer (10) is installed at one end of the connecting rod plug (9), a center gear shaft (11) is installed at one end of the tension stirrer (10), a center gear shaft (11) is installed at one end of the center gear shaft (11), and a gear shaft motor (11) is installed at one end of the center gear shaft (11). 2), a support cover plate (13) is installed at the lower end of the gear shaft motor (12), a limiting plate (14) is installed at one end of the support cover plate (13), a top block spring (15) is installed at the lower end of the limiting plate (14), a slide groove (16) is provided at one end of the mixing tank (5), a support plate rotation hole (17) is provided at one end of the mixing tank (5), a closing cover plate (18) is installed at one end of the support plate rotation hole (17), a locking cover rod (19) is installed at one end of the closing cover plate (18), a limiting rod spring (20) is installed at the outer end of the locking cover rod (19), a locking groove (21) is provided at one end of the mixing tank (5), a funnel (22) is installed at one end of the locking groove (21), and a water receiving cylinder (23) is installed at one end of the mixing tank (5).

2. A preparation method for improving the coating effect of composite powder according to claim 1, characterized in that: The oven (2) is movably connected to the workbench (1), and the horizontal ball mill (4) is threadedly connected to the workbench (1).

3. A preparation method for improving the coating effect of composite powder according to claim 1, characterized in that: The pressure lever plate (7) forms a rotating structure with the stirring tank (5) through the rotation hole (6), and the connecting rod plug (9) is movably connected to the stirring tank (5) through the pressure lever plate (7).

4. A preparation method for improving the coating effect of composite powder according to claim 1, characterized in that: The tension stirrer (10) forms a rotating structure through the center gear shaft (11) and the bearing cover plate (13), and the inner end diameter of the tension stirrer (10) is larger than the outer end diameter of the connecting rod plug (9).

5. A preparation method for improving the coating effect of composite powder according to claim 1, characterized in that: The limiting plate (14) is connected to the supporting cover plate (13) by means of a top block spring (15), and the limiting plate (14) forms a sliding structure with the stirring tank (5) through a sliding groove (16).

6. A preparation method for improving the coating effect of composite powder according to claim 1, characterized in that: The closed cover plate (18) forms a rotating structure with the stirring tank (5) through the support plate rotation hole (17), and the cover clamping rod (19) is clamped and connected with the closed cover plate (18) through the rod limiting spring (20).

7. A preparation method for improving the coating effect of composite powder according to claim 1, characterized in that: The funnel (22) is connected to the stirring tank (5) by means of a clamping groove (21), and the water receiving cylinder (23) is movably connected to the stirring tank (5).

8. A preparation method for improving the coating effect of composite powder, characterized in that: The following steps are involved: S1. Inject 500 g of spherical Al2O3 powder with a particle size of 300-500 mesh into the stirring tank (5), and slowly pour 500 ml of concentrated HCL into it, then start and control the gear shaft motor (12) to drive the tension stirrer (10) connected to the middle gear shaft (11) to slowly stir the stirring tank (5) for ten to fifteen minutes to allow it to react fully; S2, move the limiting plate (14) downward in the slide groove (16), operate the support cover plate (13) to rotate in the support plate rotation hole (17) to a direction that does not contact the stirring position of the stirring tank (5), press down one side of the pressure lever plate (7), so that it rotates counterclockwise on the stirring tank (5) through the support rotation hole (6), thereby driving the connecting rod plug (9) to move upward, so that the bottom of the stirring tank (5) is opened, and the mixed liquid in the stirring tank (5) is poured downward into the funnel (22), and the powder in the solution is filtered out through the filter paper provided in the funnel (22), and deionized water can be injected from the upper end of the stirring tank (5), so that the solution in the stirring tank (5) can be thoroughly flushed, and deionized water can be released multiple times to rinse the powder in the filter paper four to five times; S3, adding 97wt.%-Al2O3 and 3wt.%-TiO2 powders into a corundum ball milling jar with a locking device, and placing the jar on a horizontal ball mill (4) for ball milling and mixing, with a ball-to-material ratio of 1:1, a ball mill speed of 160 revolutions per minute, and the ball milling lasts for fifteen to thirty minutes; S4, polyvinyl alcohol (PVA) powder dried for a certain period of time is mixed with distilled water in a ratio of 3wt%:97wt% to prepare an adhesive solution, i.e., a polyvinyl alcohol aqueous solution, and stirred and blended using a magnetic stirrer (3), and the prepared mixed ball-milled powder is poured into the polyvinyl alcohol aqueous solution, and the mixture is put into a stirring tank (5), and the closing cover plate (18) is rotated in the support plate rotation hole (17) to a position in which it is in contact with the support cover plate (13), and the cover rod (19) is engaged with the closing cover plate (18) on the support cover plate (13) through the action of the limit rod spring (20) to prevent the solution from overflowing during the preparation process, and the tension stirrer (10) is driven by the gear shaft motor (12) to perform rapid stirring and blending, and the stirrer is set to 500rpm / minute for twenty to thirty minutes; S5. Finally, the uniformly mixed powder slurry is placed in an oven (2), and the temperature of the oven (2) is set to 180 degrees. By utilizing the characteristics that AlCl3 is easily soluble in water and sublimates at 178 degrees, the moisture in the slurry and the generated AlCl3 are removed to obtain a nano-3% TiO2-coated Al2O3-3% TiO2 composite powder. At this time, the nano-powder is uniformly coated around the spherical alumina powder to form a "satellite" structure. Then, the commercial melt-crushed AT3 powder and the prepared coated powder can be used to form a thermal spray coating using the same plasma spraying process.

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