A low-angle deposition inclusion dispersed deposition body and a preparation method thereof

Abstract

The application discloses a kind of small-angle deposition inclusion dispersed deposition deposition body and preparation method thereof, belong to material surface modification and coating technical field.To be sprayed area is divided into acceptable angle spraying area and unacceptable angle spraying area, when the particle coverage of unacceptable angle spraying area in the same direction with spraying pass increase direction is less than 30%, first pass spraying is carried out;Two areas are continuously divided in the next to be sprayed pass area until the particle coverage of unacceptable angle spraying area is less than 30%, while the current acceptable angle spraying area covers the previous unacceptable angle spraying area, subsequent pass spraying is carried out until the acceptable angle spraying area of all passes covers unacceptable angle spraying area completely, spraying is ended.Through quantitative judgment of each step spraying condition, it can be guaranteed that small-angle deposition inclusion is dispersedly deposited, and subsequent high-angle particles are compacted to improve the combination, to avoid small-angle deposition inclusion particles to form continuous layer weak area to reduce coating performance.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of material surface modification and coating technology, and particularly relates to a deposition body with dispersed small-angle deposition inclusions and a preparation method thereof. BACKGROUND

[0002] Cold spraying is a new solid-state coating preparation method. Powder particles with a diameter of several microns to tens of microns impact the surface of the substrate. The powder particles form a coating with a thickness of tens of microns to several centimeters while remaining in a solid state. Cold spraying has important applications in high-quality corrosion protection and wear resistance, metal coating, and composite material coating due to its outstanding metallurgical advantages. The effective impact velocity of the powder particles during spraying decreases as the spraying angle decreases. Therefore, low-angle spraying results in weak bonding strength of the deposited powder particles and easy peeling. During cold spraying, due to the diverging effect of the airflow in the spray gun, when ideal high-angle spraying (about 90°) is used to prepare a coating, low-angle spraying (less than 50°) regions inevitably exist on the sprayed surface, resulting in the presence of low-angle deposition inclusions in the deposition body. This situation is more pronounced when the substrate surface is uneven and has small-radius transition zones. More importantly, these low-angle deposition regions will be embedded in the interior of the deposition body as the deposition body thickens, forming a continuous weak zone that reduces the tensile strength and fatigue resistance of the coating and seriously affects subsequent use. Therefore, appropriate methods need to be used during spraying to avoid the formation of continuous low-angle deposition inclusions. SUMMARY

[0003] To overcome the shortcomings of the prior art, the present application aims to provide a deposition body with dispersed small-angle deposition inclusions and a preparation method thereof to solve the problem of the formation of large weak zones by small-angle deposition inclusions during cold spraying, which reduces the performance of the coating.

[0004] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0005] The present application discloses a preparation method of a deposition body with dispersed small-angle deposition inclusions. The region to be sprayed is divided into acceptable angle spraying regions and unacceptable angle spraying regions. The first pass of spraying is performed when the particle coverage of the unacceptable angle spraying region in the same direction as the spraying pass increase direction is less than 30%. Then, the acceptable angle spraying region and the unacceptable angle spraying region are further divided in the next region to be sprayed, until the particle coverage of the unacceptable angle spraying region is less than 30%, and the current acceptable angle spraying region covers the previous unacceptable angle spraying region. Subsequent passes of spraying are then performed until all the acceptable angle spraying regions of all passes cover the unacceptable angle spraying region, and the spraying is completed.

[0006] Preferably, the unacceptable angle refers to an acute angle between the velocity direction of the sprayed particles and the substrate that is less than 50°, and the acceptable angle refers to an acute angle between the velocity direction of the sprayed particles and the substrate that is greater than or equal to 50°.

[0007] Preferably, when spraying the next area to be sprayed, the unacceptable angle spraying area in the opposite direction of the increase in spraying direction and the next unacceptable angle spraying area in the opposite direction of the increase in spraying direction do not contact each other, or the total particle coverage of the aforementioned two unacceptable angle spraying areas is <30%, then the subsequent spraying is carried out.

[0008] Preferably, the particle coverage calculation method is as follows: Particle coverage = Deposited particle area within the representative region / Total area of ​​the representative region, where the representative region is any area of ​​0.5mm × 0.5mm.

[0009] Preferably, the specific steps are as follows:

[0010] S1: Preset the first spraying operation, preset the initial spray gun angle and spray gun scanning path, and divide the area to be sprayed in this pass into an acceptable angle spraying area A1 and an unacceptable angle spraying area U1. The unacceptable angle spraying area U1 includes at most an area U in the opposite direction to the direction of increasing spraying pass. 1l And the area U in the same direction as the increase in the number of spray passes. 1r Spraying at unacceptable angles in the U area 1r Arbitrarily select a representative region R(U) 1r );

[0011] S2: Determine whether the representative region R(U) is satisfied. 1r If the particle coverage is less than 30%, proceed to S3; if it is met, proceed to S4.

[0012] S3: Adjust the powder feeding rate, spray gun movement speed and spraying distance, then switch to S1;

[0013] S4: Determine the powder feed rate, spray gun movement speed, and spraying distance for the first coat, n=1, spraying;

[0014] S5: Update n, let n = n + 1;

[0015] S6: Preset the nth spraying operation, design the initial spray gun angle and spray gun scanning path, and divide the area to be sprayed in this pass into an acceptable angle spraying area A. n U-shaped area with unacceptable angle spraying n The unacceptable angle spraying area U n The maximum area includes the region U in the direction opposite to the direction of increasing spray pass. nl And the area U in the same direction as the increase in the number of spray passes.nr In the area U nl and the area U nr in the same direction as the increasing direction of the spraying pass nl ) and R(U nr ) are selected arbitrarily;

[0016] S7: judge whether ① ② A n coverage of U (n-1)r > 100%, ③ the particle coverage in R(U nr ) < 30%, ④ U (n-1)l ∩ U nl = 0 or the particle coverage in R(U (n-1)l )∪R(U nl ) < 30% are satisfied simultaneously, if yes, go to S9;

[0017] S8: adjust the powder feeding rate, the spraying gun moving speed and the spraying distance, and go to S6;

[0018] S9: determine the powder feeding rate, the spraying gun moving speed and the spraying distance of the n-th spraying pass, and spray;

[0019] S10: judge whether the spraying of all passes is completed, if not, go to S5; if yes, end the spraying.

[0020] Further preferably, before S1, the powder feeding rate, the spraying gun moving speed, the spraying distance and the preheating temperature are preset according to the selected spraying equipment hardware.

[0021] Preferably, in S7, the A n coverage of U (n-1)r > 100% means that the deposited particles in the A n area cover all the deposited particles in the U (n-1)r area.

[0022] The present application also discloses the deposited body prepared by the above method, wherein there are no small-angle deposited particles connected into a sheet in the deposited body, and each small-angle deposited particle in the deposited body is directly covered by a high-angle deposited particle; and there is at least one high-angle deposited particle in each area of the deposited body.

[0023] Preferably, the small-angle deposition refers to the angle between the particle velocity direction and the substrate plane or section < 50°, and the high-angle deposition refers to the angle between the particle velocity direction and the substrate plane or section ≥ 50°.

[0024] Preferably, the absence of continuous small-angle deposition particles means that the small-angle deposition particles do not aggregate in local areas. In terms of a representative area of 0.5 mm x 0.5 mm, the small-angle deposition particles are considered to not aggregate when the area of the deposition particles in the area is less than 30% of the total area of the area.

[0025] Compared with the prior art, the present application has the following beneficial effects:

[0026] The present application provides a preparation method of a deposition body with dispersed small-angle deposition inclusions. By dividing the to-be-sprayed area into acceptable-angle spraying areas and unacceptable-angle spraying areas, and continuing to spray in the unacceptable-angle spraying area in the same direction as the increasing direction of the spraying pass, the high-angle ideal spraying area of the next spraying pass can completely cover the low-angle area of the previous spraying pass, thereby tamping the small-angle deposition particles during the spraying process, improving the bonding strength of the small-angle deposition particles. When the area of the deposition particles is less than 30% of the area of the unacceptable-angle spraying area in the same direction as the increasing direction of the spraying pass, the deposition particles do not aggregate, and there are no continuous small-angle deposition particles. This spraying method can avoid the superposition of the low-angle deposition area during the subsequent spraying process, further preventing the formation of a continuous layer of small-angle deposition inclusions. Compared with the traditional cold spraying operation, this method ensures the dispersed deposition of small-angle deposition inclusions by quantitatively judging the spraying conditions of each step, and the small-angle deposition inclusions are improved in bonding by being tamped by subsequent high-angle particles, thereby avoiding the formation of a continuous layer of small-angle deposition inclusion particles and reducing the performance of the coating. The deposition body obtained by this method does not have continuous small-angle deposition particles, the small-angle deposition particles in the deposition body are directly covered with high-angle deposition particles, and each area in the deposition body has at least one high-angle deposition particle.

[0027] Further, by adjusting the powder feeding rate, the speed of the spray gun movement, and the spraying distance, each spraying pass satisfies the dispersion of small-angle deposition particles, avoiding the aggregation of small-angle particles in the initial preparation process of the coating, thereby forming a weak area. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 Flowchart of the preparation method of a deposition body with dispersed small-angle deposition inclusions of the present application;

[0029] Figure 2 Schematic diagram of the spraying process of the present application;

[0030] Figure 3 Schematic diagram of the spraying process of Example 1 of the present application;

[0031] Figure 4 Schematic diagram of the spraying process of Example 2 of the present application;

[0032] Figure 5 This is a schematic diagram of the spraying process in Embodiment 3 of the present invention;

[0033] Figure 6 This is a schematic diagram of the spraying process in Embodiment 4 of the present invention. Detailed Implementation

[0034] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0035] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0036] The present invention will now be described in further detail with reference to the accompanying drawings:

[0037] See Figure 1 This invention discloses a method for preparing a sedimentary body with small-angle sedimentary inclusions and dispersed sediments, comprising the following steps:

[0038] S1: Based on the selected spraying equipment hardware, preset the powder feeding rate, spray gun moving speed, spraying distance and preheating temperature;

[0039] S2: Perform the first spraying operation, preset the initial spray gun angle and spray gun scanning path, and divide the area to be sprayed in this pass into an acceptable angle spraying area A1 and an unacceptable angle spraying area U1 (including at most the area U1 in the opposite direction to the direction of increasing spraying pass). 1l The area U in the same direction as the increase in the number of spray passes 1r ), in U 1r Randomly select a representative region R(U) within the region 1r );

[0040] S3: Determine if R(U) is satisfied. 1r If the particle coverage is less than 30%, proceed to S4; if it is met, proceed to S5.

[0041] S4: Adjust the powder feeding rate, spray gun movement speed and spraying distance, then switch to S2;

[0042] S5: Determine the powder feed rate, spray gun movement speed, and spraying distance for the first coat, n=1, spraying;

[0043] S6: Update n, let n = n + 1;

[0044] S7: Perform the nth spraying operation, design the initial spray gun angle and spray gun scanning path, and divide the area to be sprayed in this pass into an acceptable angle spraying area A. n U-shaped area with unacceptable angle spraying n (Including at most the area U in the direction opposite to the direction of increasing spray pass) nl The area U in the same direction as the increase in the number of spray passes nr ), in U nl and U nr Randomly select a representative region R(U) within the region nl ) and R(U nr );

[0045] S8: Determine if both conditions are met simultaneously. ②A n in U (n-1)r Coverage > 100%, ③R(U nr Particle coverage <30%, ④U (n-1)l ∩U nl =0 or R(U) (n-1)l )∪R(U nl If the particle coverage is less than 30%, proceed to S9 if the requirement is not met; otherwise, proceed to S10.

[0046] S9: Adjust the powder feeding rate, spray gun movement speed and spraying distance, then switch to S7;

[0047] S10: Determine the powder feed rate, spray gun movement speed, and spraying distance for the nth spray coat; spraying;

[0048] S11: Determine whether all spraying passes have been completed. If not, proceed to S6; if completed, end the spraying process.

[0049] In S2, the unacceptable angle refers to an acute angle between the velocity direction of the sprayed particles and the substrate that is less than 50°, and the acceptable angle refers to an acute angle between the velocity direction of the sprayed particles and the substrate that is greater than or equal to 50°.

[0050] In S3 and S8, the particle coverage calculation method is: particle coverage = area of deposited particles in a representative area / total area of the representative area, and the representative area is an arbitrary area with an area of 0.5 mm x 0.5 mm;

[0051] In S8, the A n In U (n-1)r coverage > 100% means that the A n deposited particles in the U (n-1)r area are completely covered.

[0052] As Figure 2 shown in the cold spraying process, after one pass of spraying is completed, the spray gun moves to the right to perform the next pass of spraying. After the first pass of spraying is completed, an acceptable angle spraying area A1 is formed, and at the same time, a left side unacceptable angle spraying area U 1l and a right side unacceptable angle spraying area U 1r are formed, and at this time, in the U 1r , the area of the particles / 0.25 < 30%. The spray gun moves to the right by a certain distance to perform the second pass of spraying, and after the spraying is completed, an acceptable angle spraying area A2 is formed, and at the same time, a left side unacceptable angle spraying area U 2l and a right side unacceptable angle spraying area U 2r are formed, and at this time, the range of the A2 area completely contains the U 1r , and each particle in the U 1r is covered by the particles in the A2 area, and at this time, in the U 2r , the area of the particles / 0.25 < 30%, and the U 2l and the U 1l are completely non-overlapping. The spray gun moves to the right by a certain distance to perform the third pass of spraying, and after the spraying is completed, an acceptable angle spraying area A3 is formed, and at the same time, a left side unacceptable angle spraying area U 3l and a right side unacceptable angle spraying area U 3r are formed, and at this time, the range of the A3 area completely contains the U 2r , and each particle in the U 2r is covered by the particles in the A3 area, and at this time, in the U 3r , the area of the particles / 0.25 < 30%, and the U 3l and the U 2l are completely non-overlapping. The spray gun moves to the right by a certain distance to perform the fourth pass of spraying, and after the spraying is completed, an acceptable angle spraying area A4 is formed, and at the same time, a left side unacceptable angle spraying area U 4land the unacceptable angle spraying area U on the right side 4r At this point, the area of ​​region A4 completely encompasses U. 3r , and U 3r Every particle within is covered by particles in region A4, and at this time in U 4r Take any 0.5mm × 0.5mm region within the area, where the area of ​​the particles / 0.25 < 30%, and at this time U 4l with U 3l Although there are overlapping parts, in U 4l with U 3l Select any 0.5mm × 0.5mm area within the region, where the area of ​​the particles / 0.25 < 30%. The spraying of the surface to be coated is now complete, and the sample preparation is finished.

[0053] Example 1

[0054] In this embodiment, the surface to be sprayed is Figure 3 The plane shown is connected to a 25° inclined plane. After completing one coat, the spray gun moves to the right to continue spraying. For this surface to be sprayed, the powder feed rate, spray gun movement speed, spraying distance, and preheating temperature are preset for the first coat operation. The initial spray gun angle is preset so that the spray gun is perpendicular to the plane. The spray gun scanning path is preset, and the area to be sprayed is divided into an acceptable angle spraying area A1 and an unacceptable angle spraying area U1 (only the right side area U1 is included). 1r ), in U 1r Randomly select a representative region R(U) within the region 1r ), that is, a region with a size of 0.5mm × 0.5mm, R(U 1r The total surface area of ​​the particles inside is 0.02 mm. 2 At this time, R(U) 1r The particle coverage is 0.02 / 0.25 = 8% < 30%, marking the end of the first coat. For the second coat, rotate the spray gun 25° to be perpendicular to the 25° inclined plane and move the spray gun to the right, creating the acceptable angle spraying area A2, while simultaneously creating the unacceptable angle spraying area U on the left. 2l At this point, the range of region A2 completely encompasses U. 1r , and U 1r Each particle within the coating is now covered by particles in area A2, completing the second coat. At this point, the entire surface to be coated is covered, and the coating process is complete.

[0055] Example 2

[0056] In this embodiment, the surface to be sprayed is Figure 4The plane with a sharp corner shown by two 60° inclined planes, after finishing a pass, the spray gun moves to the right to continue spraying, for the surface to be sprayed, preset the powder feeding rate, the spray gun moving speed, the spraying distance and the preheating temperature, carry out the first pass spraying operation, preset the initial spray gun angle, make the spray gun perpendicular to the left 60° inclined plane, preset the spray gun scanning path, divide the sprayed area into acceptable angle spraying area Al and unacceptable angle spraying area Ul (only the right area Ul 1r ), in the Ul 1r area, randomly select a representative area R(U 1r ), i.e. an area with a size of 0.5 mm x 0.5 mm, the total area of the particles in R(U 1r ) is 0.031 mm 2 , at this time, the particle coverage in R(U 1r ) is 0.031 / 0.25 = 12.4% < 30%, the first pass spraying is finished. Carry out the second pass spraying operation, keep the spray gun angle, move the spray gun to the right, form acceptable angle spraying area A2, at the same time, form left side unacceptable angle spraying area Ul 2l , at this time, the range of A2 area completely contains Ul 1r , and each particle in Ul 1r is covered by the particles in A2 area, the second pass spraying is finished. Carry out the third pass spraying operation, make the spray gun rotate 120°, perpendicular to the right 60° inclined plane, move the spray gun to the right, form acceptable angle spraying area A3, at the same time, form right side unacceptable angle spraying area Ul 3r , in the Ul 3r area, randomly select a representative area R(U 3r ), i.e. an area with a size of 0.5 mm x 0.5 mm, the total area of the particles in R(U 3r ) is 0.014 mm 2 , at this time, the particle coverage in R(U 1r ) is 0.014 / 0.25 = 5.6% < 30%, the third pass spraying is finished. Carry out the fourth pass spraying operation, keep the spray gun angle, move the spray gun to the right, form acceptable angle spraying area A4, at the same time, form left side unacceptable angle spraying area Ul 4l , at this time, the range of A4 area completely contains Ul 3r , and each particle in Ul 3r is covered by the particles in A2 area, the fourth pass spraying is finished. At this time, the surface to be sprayed has been completely covered, the spraying is finished.

[0057] Example 3

[0058] In this embodiment, the surface to be sprayed is Figure 5The image shows two mutually perpendicular planes. After completing one coat, the spray gun moves to the right to continue spraying. For the surface to be sprayed, the powder feed rate, spray gun movement speed, spraying distance, and preheating temperature are preset. The first coat is then applied, with the initial spray gun angle preset to be perpendicular to the plane. The spray gun scanning path is preset, and at this point, only the acceptable angle spraying area A1 is formed. The first coat is then completed. The second coat is then applied by rotating the spray gun 90° to be perpendicular to the 90° plane on the right and moving it to the right. This time, only the acceptable angle spraying area A2 is formed, and the second coat is completed. At this point, the entire surface to be sprayed is covered, and the spraying process is finished.

[0059] Example 4

[0060] In this embodiment, the surface to be sprayed is Figure 6 As shown, on a quarter-circular surface, the spray gun moves to the right after completing one coat and continues spraying. For this surface to be sprayed, the powder feed rate, spray gun movement speed, spraying distance, and preheating temperature are preset for the first coat operation. The initial spray gun angle is preset so that the spray gun is perpendicular to the starting point sectional plane. The spray gun scanning path is preset, dividing the sprayed area into an acceptable angle spraying area A1 and an unacceptable angle spraying area U1 (only the right side area U1 is included). 1r ), in U 1r Randomly select a representative region R(U) within the region 1r ), that is, a region with a size of 0.5mm × 0.5mm, R(U 1r The total surface area of ​​the particles inside is 0.022 mm. 2 At this time, R(U) 1r The particle coverage is 0.022 / 0.25 = 8.8% < 30%, indicating the first coat is complete. For the second coat, rotate the spray gun 40° to a position perpendicular to the 40° arc tangent and move the gun to the right, creating the acceptable angle spraying area A2, while simultaneously creating the unacceptable angle spraying area U on the left. 2l Unacceptable angle spraying area U on the right side 2r At this point, the range of region A2 completely encompasses U. 1r , and U 1r Every particle within is covered by particles in region A2, in U 2r Randomly select a representative region R(U) within the region 2r ), that is, a region with a size of 0.5mm × 0.5mm, R(U 1r The total surface area of ​​the particles inside is 0.04 mm. 2 At this time, R(U) 1r) the inner particle coverage is 0.04 / 0.25=16%<30%, the second spraying is finished. The third spraying is performed, the spraying gun is rotated 50°, perpendicular to the 90° circular arc section, the spraying gun is moved to the right, forming the acceptable angle spraying area A3, while forming the left unacceptable angle spraying area U 3l At this time, the range of the A3 area completely contains U 2r , and each particle in U 2r is covered by the particles in the A3 area, at this time, U 3l has no overlapping part with U 2l , the third spraying is finished. At this time, the surface to be sprayed has been completely covered, and the spraying is finished.

[0061] The small angle deposition inclusion dispersion deposition method of the present application avoids the aggregation of small angle particles in the initial preparation process of the coating, thereby forming a weak area, by adjusting the powder feeding rate, the spraying gun moving speed and the spraying distance, so that each spraying meets the dispersion of small angle deposition particles. In addition, the small angle deposition particles are tamped in the spraying process by adjusting the powder feeding rate, the spraying gun moving speed and the spraying distance, so that the high angle ideal spraying area of the next spraying can completely cover the low angle area of the previous spraying, thereby tamping the small angle deposition particles in the spraying process, so that the small angle deposition particle bonding strength is improved. In addition, the low angle deposition area is also avoided in the subsequent spraying process, further preventing the formation of a continuous layer of small angle deposition inclusions. The above means avoids the formation of a continuous layer of small angle deposition inclusion particles, thereby reducing the performance of the coating.

[0062] The above content only illustrates the technical idea of the present application, and cannot limit the protection scope of the present application. Any modification made according to the technical idea of the present application on the basis of the technical solution falls within the protection scope of the claims of the present application.

Claims

1. A method for preparing a sedimentary body with small-angle sedimentary inclusions and dispersed sediments, characterized in that, The area to be sprayed is divided into acceptable angle spraying areas and unacceptable angle spraying areas. When the particle coverage of the unacceptable angle spraying area in the same direction as the increase of the spraying pass is <30%, the first spraying pass is performed. Then, in the next spraying pass area, the acceptable angle spraying area and unacceptable angle spraying area are divided again until the particle coverage of the unacceptable angle spraying area is <30%, and at the same time, the current acceptable angle spraying area covers the previous unacceptable angle spraying area. Then, the subsequent spraying passes are performed until the acceptable angle spraying areas of all passes completely cover the unacceptable angle spraying areas, and the spraying ends. The unacceptable angle refers to an acute angle between the velocity direction of the sprayed particles and the substrate that is less than 50°, while the acceptable angle refers to an acute angle between the velocity direction of the sprayed particles and the substrate that is greater than or equal to 50°.

2. The method for preparing a sedimentary body with small-angle sedimentary inclusions and dispersed sediments according to claim 1, characterized in that, When spraying the next area to be sprayed, if the unacceptable angle sprayed area in the opposite direction of the increase in spraying direction and the next unacceptable angle sprayed area in the opposite direction of the increase in spraying direction do not contact each other, or if the total particle coverage of the two unacceptable angle sprayed areas is less than 30%, then the subsequent spraying shall be carried out.

3. The method for preparing a sedimentary body with small-angle sedimentary inclusions and dispersed sediments according to claim 1, characterized in that, Particle coverage calculation method: Particle coverage = Deposited particle area within the representative region / Total area of ​​the representative region, where the representative region is any area of ​​0.5mm × 0.5mm.

4. A method for preparing a sedimentary body with small-angle sedimentary inclusions and dispersed sediments according to any one of claims 1 to 3, characterized in that, The specific steps are as follows: S1: Preset the first spraying operation, preset the initial spray gun angle and spray gun scanning path, and divide the area to be sprayed in this pass into an acceptable angle spraying area A1 and an unacceptable angle spraying area U1. The unacceptable angle spraying area U1 includes at most an area U in the opposite direction to the direction of increasing spraying pass. 1l And the area U in the same direction as the increase in the number of spray passes. 1r Spraying at unacceptable angles in the U area 1r Arbitrarily select a representative region R(U) 1r ); S2: Determine whether the representative region R(U) is satisfied. 1r If the particle coverage is less than 30%, proceed to S3; if it is met, proceed to S4. S3: Adjust the powder feeding rate, spray gun movement speed and spraying distance, then switch to S1; S4: Determine the powder feed rate, spray gun movement speed, and spraying distance for the first coat, n=1, spraying; S5: Update n, let n = n + 1; S6: Preset the nth spraying operation, design the initial spray gun angle and spray gun scanning path, and divide the area to be sprayed in this pass into an acceptable angle spraying area A. n U-shaped area with unacceptable angle spraying n The unacceptable angle spraying area U n The maximum area includes the region U in the direction opposite to the direction of increasing spray pass. nl And the area U in the same direction as the increase in the number of spray passes. nr In the region U, which is in the opposite direction to the direction of increasing spray pass frequency nl and the region U in the same direction as the increase in the number of spray passes nr Arbitrarily select a representative region R(U) nl ) and R(U nr ); S7: Determine whether ① is satisfied simultaneously. ②A n in U (n-1)r Coverage > 100%, ③R(U nr Particle coverage <30%, ④U (n-1)l ∩U nl =0 or R(U) (n-1)l )∪R(U nl If the particle coverage is less than 30%, proceed to S9. S8: Adjust the powder feeding rate, spray gun movement speed and spraying distance, then switch to S6; S9: Determine the powder feed rate, spray gun movement speed, and spraying distance for the nth spray coat; then proceed with the spraying. S10: Determine whether all spraying passes have been completed. If not, proceed to S5; if completed, end the spraying process.

5. The method for preparing a sedimentary body with small-angle sedimentary inclusions and dispersed sediments according to claim 4, characterized in that, Before S1, the powder feeding rate, spray gun movement speed, spraying distance and preheating temperature are preset according to the selected spraying equipment hardware.

6. The method for preparing a sedimentary body with small-angle sedimentary inclusions and dispersed sediments according to claim 4, characterized in that, In S7, the A mentioned n in U (n-1)r Coverage > 100% refers to A n Deposited particles in the region will U (n-1)r The area is completely covered by sedimentary particles.

7. The deposit obtained by the method according to any one of claims 1 to 6, characterized in that, There are no continuous small-angle sedimentary particles inside the sedimentary body; all small-angle sedimentary particles inside the sedimentary body are directly covered by high-angle sedimentary particles; each region inside the sedimentary body contains at least one layer of high-angle sedimentary particles. The unacceptable angle refers to an acute angle between the velocity direction of the sprayed particles and the substrate that is less than 50°, while the acceptable angle refers to an acute angle between the velocity direction of the sprayed particles and the substrate that is greater than or equal to 50°.

8. The sediment body according to claim 7, characterized in that, Small-angle deposition refers to a particle velocity direction with an angle of less than 50° to the matrix plane or tangent, while high-angle deposition refers to a particle velocity direction with an angle of ≥50° to the matrix plane or tangent.

9. A sedimentary body with small-angle sedimentary inclusions and dispersed sediments according to claim 7, characterized in that, The absence of continuous small-angle sedimentary particles means that small-angle sedimentary particles do not aggregate in local areas. Using a representative area of ​​0.5mm × 0.5mm as the standard, when the area of ​​sedimentary particles in this area accounts for less than 30% of the total area of ​​the area, it is considered that the sedimentary particles have not aggregated and there are no continuous small-angle sedimentary particles.

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