A kind of high-temperature ablation-resistant impact-resistant wear-resistant powder for laser cladding and a method for preparing laser cladding coating on the surface of a gun barrel

Abstract

The application provides a kind of high-temperature ablation-resistant impact-resistant wear-resistant powder for laser cladding and a method for preparing laser cladding coating on the surface of a gun barrel, belonging to the technical field of laser cladding surface modification.The application obtains a coating with high bonding strength with the gun barrel substrate by designing the composition and content of the powder and using laser cladding method to perform surface modification on the gun barrel substrate.The hard coating prepared by using the powder and laser cladding according to the application is free of cracks and pores, which can significantly improve the high-temperature resistance, ablation resistance, impact resistance and wear resistance of the gun barrel substrate.The obtained coating has high-temperature ablation resistance, impact resistance and wear resistance, and can still have the characteristics of wear resistance, ablation resistance and impact resistance in a high-temperature ablation and severe wear environment.The coating coated on the inner bore of the barrel can improve the combat effectiveness, accuracy and service life of the gun.

Description

Technical Field

[0001] This invention relates to the field of laser cladding surface modification technology, and in particular to a high-temperature erosion-resistant, impact-resistant, and wear-resistant powder for laser cladding and a method for preparing a laser cladding coating on the surface of an artillery barrel. Background Technology

[0002] During operation, artillery launching systems face extreme service environments characterized by high temperatures, high pressures, and impacts. With each firing cycle, the main technical indicators of the artillery barrel, such as its power and accuracy, decline rapidly, severely impacting the equipment's sustained combat effectiveness, wasting scarce resources, and having a highly detrimental effect on the safe operation of the launching system. Therefore, it is required that the deep barrel of the artillery undergo specialized surface modification treatment to achieve resistance to high-temperature erosion and impact ablation under these service conditions.

[0003] Currently, the coatings used for deep barrels of artillery are mostly applied using electroplated chromium. However, this method suffers from poor resistance to ablation and impact wear under extreme environments. Furthermore, the coating material has poor physicochemical properties compared to the artillery barrel substrate, leading to problems such as surface cracking, wear, ablation, and film peeling during service. For example, chromium electroplating may experience fatigue cracking or detachment under high stress and frequent loading. In high-temperature sliding and high-friction areas such as the gun barrel and projectile, the electroplated layer may ablate and wear, thereby reducing the artillery's performance and accuracy.

[0004] Therefore, to address the above issues, it is necessary to further optimize the coating composition and prepare coating powder with better compatibility with the gun barrel substrate. In subsequent laser cladding preparation, a gun barrel coating that meets the requirements of harsh service environments can be obtained, enabling the coating to have resistance to high-temperature ablation and impact wear resistance, thereby extending the service life of the gun and improving the resistance to high-temperature ablation and impact wear resistance of deep tubes in extreme environments. Summary of the Invention

[0005] In view of this, the purpose of this invention is to provide a high-temperature erosion-resistant, impact-resistant, and wear-resistant powder for laser cladding and a method for preparing a laser cladding coating on the surface of an artillery barrel. The high-temperature erosion-resistant, impact-resistant, and wear-resistant powder for laser cladding provided by this invention can effectively improve the wear resistance, high-temperature resistance, ablation resistance, and impact resistance of the artillery barrel surface, and extend the service life of the artillery.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solution:

[0007] This invention provides a high-temperature erosion-resistant, impact-resistant, and wear-resistant powder for laser cladding, the elemental composition of which, by mass percentage, includes:

[0008]

[0009] Preferably, the particle size of the high-temperature ablation resistant, impact resistant, and wear-resistant powder used for laser cladding is 50–150 μm.

[0010] This invention provides a method for preparing the above-mentioned high-temperature ablation-resistant, impact-resistant, and wear-resistant powder for laser cladding, comprising the following steps:

[0011] Co pre-powder, Cr pre-powder, Fe pre-powder, Ni pre-powder, Mo pre-powder, W pre-powder, Si pre-powder, Mn pre-powder and Y pre-powder were ball-milled and mixed to obtain a high-temperature erosion resistant, impact resistant and wear-resistant powder for laser cladding.

[0012] Preferably, the ball milling and mixing are carried out under a protective atmosphere;

[0013] The ball milling media used in the ball milling mixture is The SiO2 balls have a ball-to-material ratio of 2.5 to 3:1.

[0014] Preferably, the ball milling mixing rate is 300-320 r / min, and the time is 10-12 h;

[0015] The ball milling process involves bidirectional rotation, with a 0.5-hour pause every 2 hours before reversing the rotation direction.

[0016] This invention provides the application of the above-mentioned high-temperature ablation-resistant, impact-resistant, and wear-resistant powder for laser cladding in the preparation of laser cladding coatings for artillery barrels.

[0017] This invention provides a method for preparing a laser cladding coating on the surface of an artillery barrel, comprising the following steps:

[0018] Using the aforementioned high-temperature resistant, ablation-resistant, impact-resistant, and wear-resistant powder for laser cladding as the cladding raw material, the cladding raw material is placed in the powder feeder of the laser cladding equipment for laser cladding, forming a laser cladding coating on the surface of the artillery barrel substrate.

[0019] Preferably, during the laser cladding process, the scanning speed of the laser beam relative to the surface of the artillery barrel substrate is 0.5 to 1.5 m / min;

[0020] The power of the laser beam is 0.6–1.3 kW;

[0021] The diameter of the laser spot formed at the focal point is 0.5–1.5 mm.

[0022] Preferably, the powder feeder delivers 20-30g of powder.

[0023] Preferably, the gun barrel base is cylindrical in shape;

[0024] During the laser cladding process, the gun barrel substrate rotates around its axis, and the linear velocity of its surface is 0.5 to 1.2 m / min.

[0025] This invention provides a high-temperature ablation-resistant, impact-resistant, and wear-resistant powder for laser cladding. The elemental composition, by mass percentage, includes: Mn 0.5–1.5%; W 3.0–5.0%; Si 2.0–4.0%; Cr 15–30%; Fe 20–30%; N 2.0–4.0%; Mo 0.1–0.5%; Y 0.1–0.15%; with the balance being Co. In this invention, the elemental composition of the high-temperature ablation-resistant, impact-resistant, and wear-resistant powder is Co, Cr, Fe, Ni, Mo, W, Si, Mn, and Y. In this invention, the elements Co, Cr, Fe, Ni, W, Si, and Mn can improve the corrosion resistance of the coating, especially Cr, making the powder system more resistant to chemical corrosion, oxidation, and corrosive media. These elements also provide the coating with antioxidant properties, preventing oxidation and sintering of the coating under high-temperature conditions. The addition of W and Mo can significantly improve the hardness and wear resistance of the coating. Mo forms an α-Mo hard phase in the coating, with a face-centered cubic crystal structure, giving the coating high hardness and effectively resisting friction and high loads, making it more wear-resistant and scratch-resistant. It also improves the thermal stability of the powder system, enabling it to withstand high-temperature environments. Y element can improve the adhesion between the coating and the substrate, ensuring the coating firmly adheres to the substrate surface. The high-temperature ablation-resistant and impact-resistant wear-resistant powder for laser cladding provided by this invention can withstand high-temperature ablation at 600℃, and its impact energy at 600℃ is 600–630 kJ / m. 2 .

[0026] This invention provides a method for preparing a laser cladding coating on the surface of an artillery barrel. The invention involves designing the composition and content of the powder and using laser cladding to modify the surface of the artillery barrel substrate, resulting in a coating with high bonding strength to the barrel substrate. The crack-free, pore-free hard coating obtained using the powder and laser cladding described in this invention significantly improves the high-temperature resistance, ablation resistance, impact resistance, and wear resistance of the barrel substrate. The resulting coating exhibits resistance to high-temperature ablation, impact, and wear, maintaining its wear-resistant, ablation-resistant, and impact-resistant properties even under severe high-temperature ablation and wear conditions. Applying this coating to the inner bore of the barrel enhances the artillery's combat effectiveness, accuracy, and lifespan.

[0027] Furthermore, the laser cladding method for the surface of the gun barrel substrate provided by the present invention enables the cladding layer and the gun steel substrate to be firmly and reliably bonded by controlling the laser energy of the laser beam; while keeping the gun barrel substrate rotating on its axis, the laser beam and the powder feeder cooperate to form multiple layers of cladding coating on the curved surface of the gun barrel substrate. Attached Figure Description

[0028] Figure 1 The impact energy test results of the gun barrel substrate before and after laser cladding coating in Example 1 are shown.

[0029] Figure 2 The results of 2D scratch depth test on the gun barrel substrate before and after laser cladding coating in Example 1;

[0030] Figure 3 This is a cross-sectional morphology diagram of the laser cladding coating on the gun barrel substrate after grinding, as shown in Example 1.

[0031] Figure 4 The coefficient of linear expansion of the laser cladding coating on the gun barrel substrate in Example 1;

[0032] Figure 5 The results of 2D scratch depth tests on the coatings obtained in Examples 2 and 3 are shown.

[0033] Figure 6 The results are the 2D scratch depth test results of the coatings obtained in Comparative Examples 1 and 2. Detailed Implementation

[0034] This invention provides a high-temperature erosion-resistant, impact-resistant, and wear-resistant powder for laser cladding, the elemental composition of which, by mass percentage, includes:

[0035]

[0036] Unless otherwise specified, all raw materials used in this invention are commercially available.

[0037] The high-temperature ablation-resistant, impact-resistant, and wear-resistant powder for laser cladding provided by this invention, by weight percentage, comprises 0.5-1.5% Mn, preferably 1%. In this invention, the source of Mn is preferably Mn pre-powder, the purity of the Mn pre-powder is preferably ≥99.99%, and the particle size of the Mn pre-powder is preferably 50-150 μm, more preferably 100 μm. In this invention, the role of Mn is to improve the toughness and strength of the coating, enhance hardening and strengthening effects, and promote grain refinement.

[0038] The laser cladding powder for high-temperature ablation resistance, impact resistance, and wear resistance provided by this invention, by weight percentage, comprises 3.0–5.0% W, preferably 3.5–4.5%, and more preferably 4.0%. In this invention, the source of W is preferably W pre-formed powder, the purity of which is preferably ≥99.99%, and the particle size of which is preferably 50–150 μm, more preferably 100 μm. In this invention, the role of W is to improve the hardness and wear resistance of the coating.

[0039] The high-temperature ablation-resistant, impact-resistant, and wear-resistant powder for laser cladding provided by this invention, by weight percentage, comprises 2.0–4.0% Si, preferably 2.5–3.5%, and more preferably 3.0%. In this invention, the source of Si is preferably Si pre-formed powder, the purity of which is preferably ≥99.99%, and the particle size of which is preferably 50–150 μm, more preferably 100 μm. In this invention, the role of Si is to improve the strength and corrosion resistance of the coating.

[0040] The laser cladding anti-high temperature ablation, impact-resistant, and wear-resistant powder provided by this invention, by weight percentage, comprises 15-30% Cr, preferably 20-25%. In this invention, the source of Cr is preferably Cr pre-powder, the purity of the Cr pre-powder is preferably ≥99.99%, and the particle size of the Cr pre-powder is preferably 50-150 μm, more preferably 100 μm. In this invention, the role of Cr is to make the powder system more resistant to chemical corrosion, oxidation, and erosion by corrosive media.

[0041] The high-temperature ablation-resistant, impact-resistant, and wear-resistant powder for laser cladding provided by this invention, by weight percentage, comprises 20-30% Fe, preferably 22-28%, and more preferably 25%. In this invention, the Fe is preferably sourced from Fe pre-powder, the purity of which is preferably ≥99.99%, and the particle size of which is preferably 50-150 μm, more preferably 100 μm. In this invention, the role of Fe is to regulate the melting point, coefficient of thermal expansion, and thermal conductivity of the coating.

[0042] The laser cladding powder for high-temperature ablation resistance, impact resistance, and wear resistance provided by this invention, by weight percentage, comprises 2.0–4.0% Ni, preferably 3.0%. In this invention, the Ni is preferably sourced from Ni pre-formed powder, the purity of which is preferably ≥99.99%, and the particle size of which is preferably 50–150 μm, more preferably 100 μm. In this invention, the role of Ni is to improve the corrosion resistance and high-temperature strength of the coating.

[0043] The high-temperature ablation-resistant, impact-resistant, and wear-resistant powder for laser cladding provided by this invention, by weight percentage, comprises 0.1–0.5% Mo, preferably 0.2–0.4%. In this invention, the source of Mo is preferably Mo pre-powder, the purity of the Mo pre-powder is preferably ≥99.99%, and the particle size of the Mo pre-powder is preferably 50–150 μm, more preferably 100 μm. In this invention, the role of Mo is to form an α-Mo hard phase in the coating, which has a face-centered cubic crystal structure, giving the coating high hardness, effectively resisting friction and high loads, making it more wear-resistant and scratch-resistant, and also improving the thermal stability of the powder system, enabling it to withstand use in high-temperature environments.

[0044] The laser cladding powder for high-temperature ablation resistance, impact resistance, and wear resistance provided by this invention, by weight percentage, comprises 0.1-0.15% Y, preferably 0.12-0.14%. In this invention, the Y is preferably sourced from Y pre-formed powder, the purity of which is preferably ≥99.99%, and the particle size of which is preferably 50-150 μm, more preferably 100 μm. In this invention, the Y element can improve the adhesion between the coating and the substrate, ensuring that the coating firmly adheres to the substrate surface.

[0045] The laser cladding powder for high-temperature ablation, impact, and wear resistance provided by this invention, by weight percentage, further includes a balance of Co. In this invention, the source of Co is preferably Co pre-formed powder, the purity of which is preferably ≥99.99%, and the particle size of which is preferably 50–150 μm, more preferably 100 μm. In this invention, the role of Co is to improve the hardness, wear resistance, and high-temperature resistance of the coating.

[0046] In this invention, the particle size of the high-temperature ablation-resistant, impact-resistant, and wear-resistant powder for laser cladding is preferably 50-150 μm, more preferably 80-120 μm, and even more preferably 100 μm.

[0047] This invention provides a method for preparing the above-mentioned high-temperature ablation-resistant, impact-resistant, and wear-resistant powder for laser cladding, comprising the following steps:

[0048] Co pre-powder, Cr pre-powder, Fe pre-powder, Ni pre-powder, Mo pre-powder, W pre-powder, Si pre-powder, Mn pre-powder and Y pre-powder were ball-milled and mixed to obtain a high-temperature erosion resistant, impact resistant and wear-resistant powder for laser cladding.

[0049] In this invention, the Co pre-powder, Cr pre-powder, Fe pre-powder, Ni pre-powder, Mo pre-powder, W pre-powder, Si pre-powder, Mn pre-powder, and Y pre-powder are all spherical powders, with a purity preferably ≥99.99% and a particle size preferably 50-150 μm, more preferably 100 μm.

[0050] In this invention, the ball milling mixing is preferably carried out under a protective atmosphere, which is preferably 99.999% Ar or He gas.

[0051] In this invention, the ball milling media used in the ball milling mixture is preferably […]. The SiO2 spheres are preferably made with a sphere-to-material ratio of 2.5 to 3:1, where the sphere-to-material ratio is the mass ratio.

[0052] In this invention, the ball milling mixing preferably includes the following steps:

[0053] a. Place the pre-formed powders of Co, Cr, Fe, Ni, Mo, W, Si, Mn, and Y with a purity of 99.99% into a mixing tank for later use according to a certain ratio;

[0054] b. Use SiO2 balls were weighed and prepared according to a ball-to-material ratio of 3:1.

[0055] c. Place the raw materials prepared in steps a and b into a mixing tank, fill it with protective gas, and seal it.

[0056] d. Place the mixing tank from step c into the planetary ball mill and assemble and fix it for ball milling and mixing.

[0057] In this invention, the ball milling mixing rate is preferably 300-320 r / min, more preferably 310 r / min, and the time is preferably 10-12 h.

[0058] In this invention, the mixing direction of the ball mill is preferably bidirectional rotation, with a 0.5-hour pause every 2 hours before reversing the rotation.

[0059] In this invention, after ball milling, the mixed powder is preferably sieved and dried. The sieving is preferably performed using a vibrating sieve, and the mesh size of the sieve is preferably 100 mesh. The sieving time is preferably 5–10 minutes.

[0060] The present invention preferably uses a dryer for the drying process; in the present invention, the drying temperature is preferably 90-100°C and the drying time is preferably 2 hours.

[0061] This invention uses ball milling to prepare high-temperature ablation-resistant, impact-resistant, and wear-resistant powder for laser cladding. The resulting powder has the advantages of good sphericity and good flowability. It can be used to prepare a high-temperature ablation-resistant and impact-resistant wear-resistant coating through subsequent laser cladding methods, thereby improving the wear resistance, high-temperature resistance, ablation resistance, and impact resistance of the artillery surface.

[0062] The method for preparing the high-temperature ablation-resistant, impact-resistant, and wear-resistant powder of this invention is simple. The cladding coating structure produced by laser cladding on the surface of the artillery barrel is a face-centered cubic structure, which has excellent hardness and corrosion resistance. The cladding layer obtained by this method is free of cracks and pores, and the substrate and cladding layer are firmly bonded. Furthermore, the coefficient of linear expansion test shows that its coefficient is similar to that of the gun steel substrate. This solves the problems of cracking and film peeling in traditional surface treatment coatings, and can meet the requirements of artillery barrel surface for wear resistance, ablation resistance, and impact resistance, ensuring firing stability and accuracy, effectively extending service life, and meeting the harsh service conditions required for artillery barrel firing.

[0063] This invention provides the application of the above-mentioned high-temperature ablation-resistant, impact-resistant, and wear-resistant powder for laser cladding in the preparation of laser cladding coatings for artillery barrels.

[0064] This invention provides a method for preparing a laser cladding coating on the surface of an artillery barrel, comprising the following steps:

[0065] Using the aforementioned high-temperature resistant, ablation-resistant, impact-resistant, and wear-resistant powder for laser cladding as the cladding raw material, the cladding raw material is placed in the powder feeder of the laser cladding equipment for laser cladding, forming a laser cladding coating on the surface of the artillery barrel substrate.

[0066] In this invention, prior to laser cladding, the high-temperature resistant, ablation-resistant, impact-resistant, and wear-resistant powder used for laser cladding is preferably dried. The drying temperature is preferably 90–110°C, more preferably 100°C; the drying time is preferably 2 hours.

[0067] In this invention, the base shape of the artillery barrel is preferably cylindrical; the artillery barrel is preferably a deep tube. In this invention, the composition of the artillery barrel is preferably PCrNi3MoV.

[0068] In this invention, during the laser cladding process, the scanning speed of the laser beam relative to the surface of the artillery barrel substrate is preferably 0.5 to 1.5 m / min, more preferably 0.6 to 0.8 m / min.

[0069] In this invention, during the laser cladding process, the protective gas is preferably Ar gas, and the protective gas flow rate is preferably 15 L / min.

[0070] In this invention, the power of the laser beam is preferably 0.6 to 1.3 kW, more preferably 0.8 to 1.0 kW.

[0071] In this invention, the laser beam is preferably distributed with a Gaussian heat source, and the diameter of the spot formed by the laser beam at the focal position is preferably 0.5 to 1.5 mm, more preferably 1.0 mm.

[0072] In this invention, during the laser cladding process, the overlap is preferably 40-45% of the width of each weld.

[0073] In this invention, the powder feeding amount of the powder feeder is preferably 20-30g, more preferably 25g.

[0074] In this invention, during the laser cladding process, the gun barrel substrate rotates about its axis, and the linear velocity of the surface is preferably 0.5 to 1.2 m / min, more preferably 0.8 to 1 m / min.

[0075] This invention achieves a strong and reliable bond between the cladding layer and the gun steel substrate by controlling the laser energy of the laser beam; while keeping the gun barrel substrate rotating on its axis, the laser beam and the powder feeder work together to form multiple layers of cladding coating on the curved surface of the gun barrel substrate.

[0076] In this invention, the thickness of the laser cladding coating is preferably 0.8 to 1.2 mm, and more preferably 1 mm.

[0077] The following detailed description, in conjunction with embodiments, of the high-temperature erosion-resistant, impact-resistant, and wear-resistant powder for laser cladding and the method for preparing a laser cladding coating on the surface of an artillery barrel provided by the present invention, should not be construed as limiting the scope of protection of the present invention.

[0078] Example 1

[0079] The preparation method of high-temperature ablation resistant, impact resistant, and wear-resistant powder for laser cladding is as follows:

[0080] The pre-mixed powder comprises 1.5 wt.% Mn, 5 wt.% W, 4 wt.% Si, 30 wt.% Cr, 20 wt.% Fe, 4 wt.% Ni, 0.5 wt.% Mo, 0.1 wt.% Y, with the balance being Co. The pre-mixed powder is placed in a mixing tank for later use.

[0081] The pre-formed powders containing Co, Cr, Fe, Ni, Mo, W, Si, Mn, and Y are all spherical powders with a purity of 99.99% and a particle size of 50–150 μm.

[0082] The powder mixture was placed in a planetary ball mill for ball milling and mixing at a ball-to-powder ratio of 3:1. The mill jar was filled with Ar gas with a purity of 99.999%. The mill speed was 300 r / min, and the pre-programmed mixing time was set to 10 hours. The mixing direction was bidirectional rotation, with a 0.5-hour pause every 2 hours before reversing the rotation direction. After mixing was complete, the mixing jar was removed and the mixture collected for later use.

[0083] Use a 100-mesh sieve for vibrating sieving, and the sieving time is 5 to 10 minutes.

[0084] The collected powder was placed in a dryer and dried at a temperature of 90-100℃ for 2 hours. After drying, it was collected for later use.

[0085] The method for preparing a laser cladding coating on the surface of an artillery barrel is as follows:

[0086] Prepare the above-mentioned compound powder and place an appropriate amount of powder into the powder feeder.

[0087] The surface of the gun barrel substrate (composed of PCrNi3MoV) is polished to remove surface oxides (rust removal), and then the gun barrel substrate is washed with acetone and alcohol. After drying, one end of the substrate is fixed to the positioner.

[0088] The barrel substrate is fixed, and the composite powder is placed in the powder feeder. The powder feeder speed is set to 4 r / min, the laser beam is set to Gaussian heat source distribution, the diameter of the spot formed by the laser beam at the focal point is 1 mm, the scanning rate of the laser beam relative to the surface of the barrel substrate is 0.8 m / min, the laser power is 1 kW, the protective gas flow rate is 15 L / min, and the overlap is 45% of the weld width of each pass.

[0089] The laser focus position is adjusted to be on the surface of the gun barrel substrate, the pre-processing program is run, and the laser cladding process on the surface of the gun barrel substrate is completed to obtain a laser cladding coating with a thickness of 0.9 mm.

[0090] Figure 1 The results of impact energy tests on the gun barrel substrate before and after laser cladding coating in Example 1 are shown. The test standard refers to GB / T229-2020, Charpy impact test method for metallic materials. Figure 1 It can be seen that the impact energy of the coating is slightly less than that of the substrate in all temperature ranges.

[0091] Figure 2 The results of the 2D scratch depth test on the gun barrel substrate before and after laser cladding coating in Example 1 are shown. The test standard refers to GB / T 12444-2006. Figure 2 It can be seen that the wear rate was reduced by nearly 3 times after laser cladding, indicating that the laser cladding coating prepared by the present invention has achieved a significant reduction in wear rate, which meets the wear rate requirements of the artillery barrel firing system.

[0092] Figure 3 This is a cross-sectional view of the laser cladding coating on the gun barrel substrate in Example 1 after grinding. The grinding was milling, and the surface roughness Ra0.8. Figure 3 It can be seen that after grinding, no structural defects such as cracks or pores appeared on the coating cross section, indicating that the laser cladding coating has a dense structure and stable structure, and the stress control during the cladding process is reasonable, which can meet the requirements of actual working conditions and engineering applications.

[0093] Figure 4The coefficient of linear expansion is the laser cladding coating on the gun barrel substrate in Example 1. (From...) Figure 4 It can be seen that the coefficient of linear expansion of the coating is similar to that of the gun barrel substrate, which can effectively avoid the problems of cracking and peeling of traditional surface treatment coatings.

[0094] Example 2

[0095] Based on Example 1, the laser power of the laser beam was changed to 0.6kW, the scanning rate of the laser beam relative to the surface of the gun barrel was 1m / min, and the rotation speed of the powder feeder was 2r / min. Other methods and parameters were the same as in Example 1.

[0096] Example 3

[0097] Based on Example 1, the laser power of the laser beam was changed to 0.8kW, the scanning rate of the laser beam relative to the surface of the gun barrel was 1.2m / min, and the rotation speed of the powder feeder was 4r / min. Other methods and parameters were the same as in Example 1.

[0098] Figure 5 The results are from the 2D scratch depth test of the coatings obtained in Examples 2 and 3. Figure 5 It can be seen that the results of Examples 2-3 are similar to those of Example 1, and the wear amount is reduced by nearly 3 times compared with the substrate.

[0099] Comparative Example 1

[0100] Based on Example 1, the laser power of the laser beam was changed to 1.8kW, the scanning rate of the laser beam relative to the surface of the gun barrel was 1.5m / min, and the rotation speed of the powder feeder was 6r / min. Other methods and parameters were the same as in Example 1.

[0101] Figure 6 The results show the 2D scratch depth test results of the coating obtained in Comparative Example 1. Figure 6 It can be seen that the results of Comparative Example 1 and Example 1 are significantly different, with the wear amount difference being nearly 2 times, and the wear amount being reduced by nearly 1 time compared with the substrate.

[0102] Comparative Example 2

[0103] The comparative example is based on CN 102021578A, "A Nickel-Based Alloy Powder for Laser Cladding Anti-Corrosion Coating". The powder composition is as follows: 12 wt.% Cr, 11 wt.% Mo, 2 wt.% W, 1 wt.% Co, 0.3 wt.% Mn, 0.5 wt.% Fe, 0.1 wt.% Si, 0.1 wt.% Y₂O₃, 0.1 wt.% Hf, with the balance being Ni. Other methods and parameters are the same as in Example 1.

[0104] Figure 6The results show the 2D scratch depth test results of the coatings obtained in Comparative Example 1 and Comparative Example 2. Figure 6 It can be seen that the results of Comparative Example 1 are significantly different from those of Example 1, with a wear amount difference of nearly 2 times and a wear amount reduction of nearly 1 times compared to the substrate. Comparative Example 2 is significantly different from Example 1, with a wear amount difference of nearly 2 times and a wear amount that is basically the same compared to the substrate.

[0105] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A high-temperature ablation-resistant, impact-resistant, and wear-resistant powder for laser cladding, comprising, by mass percentage: Mn 0.5~1.5%; W 3.0~5.0%； Si 2.0~4.0%; Cr 15~30%； Fe 20~30%; Ni 2.0~4.0%; Mo 0.1~0.5%; Y 0.1~0.15%； The balance is Co; During the laser cladding process, the laser beam scans at a speed of 0.5~1.5 m / min relative to the surface of the artillery barrel substrate. The power of the laser beam is 0.6~1.3 kW; The diameter of the laser spot formed at the focal point is 0.5~1.5 mm.

2. The high-temperature ablation-resistant, impact-resistant, and wear-resistant powder for laser cladding according to claim 1, characterized in that, The particle size of the high-temperature ablation resistant, impact resistant, and wear-resistant powder used for laser cladding is 50~150μm.

3. The preparation method of the high-temperature ablation-resistant, impact-resistant, and wear-resistant powder for laser cladding as described in claim 1 or 2, comprising the following steps: Co pre-powder, Cr pre-powder, Fe pre-powder, Ni pre-powder, Mo pre-powder, W pre-powder, Si pre-powder, Mn pre-powder and Y pre-powder were ball-milled and mixed to obtain a high-temperature erosion resistant, impact resistant and wear-resistant powder for laser cladding.

4. The preparation method according to claim 3, characterized in that, The ball milling and mixing were carried out under a protective atmosphere; The ball milling media used in the ball milling mixture is SiO2 spheres with a diameter of 6mm and a sphere-to-material ratio of 2.5 to 3:

1.

5. The preparation method according to claim 3 or 4, characterized in that, The ball milling mixing rate is 300~320 r / min, and the time is 10~12 h; The ball milling process involves bidirectional rotation, with a 0.5-hour pause every 2 hours before reversing the rotation direction.

6. The application of the high-temperature erosion-resistant, impact-resistant, and wear-resistant powder for laser cladding as described in claim 1 or 2, or the high-temperature erosion-resistant, impact-resistant, and wear-resistant powder for laser cladding prepared by the preparation method described in any one of claims 3 to 5, in the preparation of laser cladding coatings for artillery barrels.

7. A method for preparing a laser cladding coating on the surface of an artillery barrel, comprising the following steps: Using the high-temperature erosion-resistant, impact-resistant, and wear-resistant powder for laser cladding as described in claim 1 or 2, or the high-temperature erosion-resistant, impact-resistant, and wear-resistant powder for laser cladding prepared by any one of the preparation methods described in claims 3 to 5 as the cladding raw material, the cladding raw material is placed in the powder feeder of the laser cladding equipment, and laser cladding is performed to form a laser cladding coating on the surface of the artillery barrel substrate. During the laser cladding process, the laser beam scans at a speed of 0.5~1.5 m / min relative to the surface of the artillery barrel substrate. The power of the laser beam is 0.6~1.3 kW; The diameter of the laser spot formed at the focal point is 0.5~1.5 mm.

8. The method according to claim 7, characterized in that, The powder feeder delivers 20-30 g of powder.

9. The method according to claim 7, characterized in that, The gun barrel base is cylindrical in shape; During the laser cladding process, the gun barrel substrate rotates around its axis, and the linear velocity of its surface is 0.5~1.2m / min.

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