Laser alloy, composite coating of MoSiCuPtReIrW powder and preparation method of the composite coating

Abstract

The present invention relates to the field of laser alloy technology, and discloses a laser alloy of MoSiCuPtReIrW powder, a composite coating and a preparation method of the composite coating, aiming to solve the problems of easy deformation and cracking, insufficient oxidation resistance and wear resistance of the laser alloying layer caused by the traditional laser alloying powder ratio. The laser alloy of MoSiCuPtReIrW powder is composed of the following raw materials: Mo, Si, Cu, Pt, Re, Ir, W. The present invention proposes to add rare elements Pt, Re, Ir, and W on the basis of common laser alloying powder ratio elements such as Mo, Si, and Cu, so as to solve the defects of easy deformation and cracking, insufficient oxidation resistance and wear resistance of the laser alloying layer caused by the traditional powder ratio. Based on the synergistic strengthening mechanism of the multi-element alloy components, the prepared composite coating exhibits excellent antioxidant stability and corrosion resistance, and can still maintain stable surface integrity under high-temperature friction conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of laser alloys, and in particular to a laser alloy of MoSiCuPtReIrW powder, a composite coating and a preparation method of the composite coating. Background Art

[0002] Laser technology, as a cutting-edge materials processing method, has vast application potential in the manufacturing sector. Currently, the production processes of many critical industrial and defense equipment are complex, costly, and require long production cycles. During service life, some components suffer from degradation mechanisms such as wear and corrosion, leading to material degradation and structural integrity loss, which can hinder normal operation. Therefore, improving the corrosion, wear, and oxidation resistance of these high-value-added components can not only significantly extend the service life of the equipment but also effectively improve its operating efficiency. During the laser alloying process, the substrate and coating experience rapid temperature increases and decreases. These sudden temperature changes induce thermal stresses, resulting in uneven stress distribution within the material and even deformation. This is particularly true for large and complex components, where different parts respond differently to temperature changes, potentially adversely affecting part precision and stability.

[0003] Common laser alloying powder ratios are primarily composed of elements such as Mo, Si, and Cu. During the laser alloying process, alloying powders primarily composed of Mo and Si easily react with oxygen in the air to produce products such as MoO3 and SiO2 that cannot float. These substances become impurities within the alloy layer, causing cracks and reducing the material's wear resistance and oxidation resistance. Meanwhile, alloying powders primarily composed of Cu and Mo interact with each other, changing the alloy's microstructure and creating channels within the alloy, providing pathways for the rapid diffusion and penetration of corrosive media, thereby accelerating the corrosion process and reducing the material's corrosion resistance. To this end, the present invention provides a laser alloy based on MoSiCuPtReIrW powder, a composite coating, and a method for preparing the composite coating. Summary of the Invention

[0004] To address the above-mentioned issues, the present invention provides a laser alloy of MoSiCuPtReIrW powder, a composite coating, and a method for preparing the composite coating. This laser alloy incorporates rare elements such as Pt, Re, Ir, and W in addition to Mo, Si, and Cu. This alloy not only retains the corrosion resistance of the original alloy layer but also significantly improves the material's oxidation and wear resistance. This effectively addresses the technical issue of Mo and Si reacting with oxygen to produce inclusions such as MoO₃ and SiO₂, which can lead to numerous cracks in the alloy layer and reduce its corrosion and oxidation resistance. The present invention incorporates ultrasonic vibration technology into the laser alloying process. By applying ultrasonic waves of a specific frequency (20kHz to 50kHz) and amplitude (5μm to 20μm) to the substrate surface, the present invention effectively eliminates residual stress within the molten coating, refines the grain structure, and promotes a uniform distribution of alloying elements, further reducing cracking and improving the coating's density and wear resistance.

[0005] The first object of the present invention is to provide a laser alloy of MoSiCuPtReIrW powder, which is composed of the following raw materials in mass percentage: 20%-28% Mo, 20%-25% Si, 1%-5% Cu, 6%-15% Pt, 14%-20% Re, 15%-20% Ir, and 5%-12% W, totaling 100%.

[0006] A second object of the present invention is to provide a laser alloy composite coating, which is manufactured by laser melting the above-mentioned laser alloy and adhesive, wherein the mass ratio of the laser alloy to the adhesive is 1:0.03-0.08.

[0007] A third object of the present invention is to provide a method for preparing the above-mentioned laser alloy composite coating, comprising the following steps:

[0008] S1. Weigh the following raw materials in mass percentage respectively: 20%-28% Mo, 20%-25% Si, 1%-5% Cu, 6%-15% Pt, 14%-20% Re, 15%-20% Ir, 5%-12% W; add a binder to the weighed raw materials and mix well to obtain an alloy powder coating;

[0009] S2. Applying the alloy powder to the surface of the substrate to form an alloy powder coating, and scanning the alloy powder coating with a laser overlap using an inert gas to melt the coating to obtain a laser alloy composite coating.

[0010] As a preferred embodiment, the adhesive is composed of the following raw materials in percentage by mass: 20% to 25% acrylate polymer, 22% to 30% modified polyether resin, 15% to 25% phenol, and 20% to 30% acetone, totaling 100%.

[0011] As a preferred embodiment, in step S2, during the laser scanning process, ultrasonic vibration is applied by an ultrasonic vibration head, the ultrasonic frequency is 20kHz~50kHz, the amplitude is 5μm~20μm, and the vibration time is the entire laser scanning process.

[0012] As a preferred embodiment, the thickness of the alloy powder coating is 0.2-1.3 mm.

[0013] As a preferred embodiment, the laser parameters are: laser power of 1200-3000 W, laser scanning speed of 150-350 mm / min, and spot diameter of 2-6 mm.

[0014] As a preferred embodiment, the inert gas is argon with a flow rate of 8 to 25 L / min.

[0015] As a preferred embodiment, the substrate is one of titanium alloy, precipitation hardening stainless steel (such as 17-4PH), Q235, 40Cr, nickel-based alloy (such as Monel400), and 304L stainless steel.

[0016] As a preferred embodiment, in step S2, before the alloy powder coating is applied to the surface of the substrate, the polished substrate is sent to an ultrasonic cleaning machine and cleaned in anhydrous ethanol and acetone using 15-30 kHz ultrasonic waves for 10-12 minutes.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] In order to solve the technical problem in the prior art that when the alloy is subjected to external force, stress concentration is easily generated around the inclusions, resulting in more cracks in the alloy layer, thereby reducing the corrosion resistance and oxidation resistance of the alloy layer, the present invention proposes to add rare elements such as Pt, Re, Ir, and W to the common laser alloying powder ratio elements such as Mo, Si, and Cu, thereby solving the problems of laser alloying layers produced by common powder ratios being prone to deformation and cracking, and having poor oxidation resistance and corrosion resistance. The interaction between the various component alloys of the present invention improves the oxidation resistance and wear resistance of the alloy coating, which is specifically reflected in:

[0019] Si dissolves in the Mo element to form a [Si, Mo] substitutional solid solution, which changes the electrode potential of the alloy through lattice distortion and redistribution of the electron cloud, reduces the activity of the alloy in the corrosive medium, and thus improves the corrosion resistance; Cu and Mo form Mo-Cu alloys, which can be improved through surface treatment and alloying processes by electroplating technology, adjusting the molybdenum-copper ratio and changing the microstructure of the alloy; Pt and Mo form intermetallic compounds, which can form a strengthening layer on the alloy surface or in the area subject to wear during friction by controlling the preparation process of the alloy and adjusting the generation amount and distribution of the intermetallic compounds, thereby effectively improving the wear resistance of the alloy; Re and Mo can form a solid solution alloy, which can increase the electrode potential of the alloy, reduce the anodic dissolution reaction, and thus enhance the corrosion resistance of the alloy; W and Mo form Mo- W alloy can refine the grains of Mo-W alloy by controlling the solidification process, which can effectively improve the wear resistance of the composite coating; Cu and Si form copper-silicon compounds, and the formation of Cu3Si can reduce the microscopic defects inside the alloy and improve the corrosion resistance of the alloy; Re and Si form ReSi2, and the presence of ReSi2 helps to refine the grains, change the oxidation path and rate, and improve the oxidation resistance of the alloy; W and Si form Si-W alloy, which enhances the corrosion resistance of the alloy by changing the anodic dissolution reaction of the alloy in the corrosive medium; Mo, Si and Cu can form [Si, Cu, Mo] ternary solid solution, which has a solid solution strengthening effect on the matrix and can improve the strength, hardness and oxidation resistance of the alloy; Si and Re elements form tungsten-silicon binary alloy and W-Re alloy with W element respectively, which can significantly improve the wear resistance of the composite coating. Because Mo, Cu, Pt, and Ir inherently possess excellent corrosion and oxidation resistance, they significantly enhance the wear and oxidation resistance of composite coatings. Cu and Si react with oxygen in the air to form Cu2O and SiO2 oxide films, while Mo reacts with oxygen to form a thin, dense MoO3 film, which forms a dense oxide protective layer under high temperature conditions. These reactions among the alloying elements impart excellent corrosion, oxidation, and wear resistance to the resulting composite coating.

[0020] The alloy composition of the present invention is reasonably designed, the components have strong synergy, and the processing cost is reduced and the processing efficiency is improved, thereby enabling large-scale and rapid processing in factories. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the laser alloying processing equipment used in the present invention.

[0022] Description of reference numerals:

[0023] 1. Powder feeder; 2. Argon cylinder; 3. Fiber laser; 4. Control system; 5. Ultrasonic generator; 6. Laser head; 7. Workbench; 8. Substrate; 9. Alloy powder coating layer; 10. Fixture; 11. Ultrasonic vibration head. DETAILED DESCRIPTION

[0024] To enable those skilled in the art to better understand and implement the technical solutions of the present invention, the present invention is further described below with reference to specific examples, but the examples are not intended to limit the present invention. The following experimental and detection methods are conventional methods unless otherwise specified; the reagents and raw materials are commercially available unless otherwise specified.

[0025] To address the technical problem that existing inclusion products such as MoO3 and SiO2 are produced by the reaction of Mo, Si, and other main elements with O, stress concentration is easily generated around the inclusions when the alloy is subjected to external forces, resulting in a large number of cracks in the alloy layer, thereby reducing the corrosion resistance and oxidation resistance of the alloy layer. The present invention provides a laser alloy of MoSiCuPtReIrW powder, a composite coating, and a method for preparing the composite coating. The laser alloy composite coating is prepared by laser melting the rare elements Pt, Re, Ir, and W added to the common laser alloying powder ratio elements such as Mo, Si, and Cu, thereby improving the corrosion resistance, oxidation resistance, and wear resistance of the alloy coating.

[0026] The technical solution of the present invention is described in detail below.

[0027] The invention provides a laser alloy of MoSiCuPtReIrW powder. The laser alloy is composed of the following raw materials in percentage by mass: 20% to 28% Mo, 20% to 25% Si, 1% to 5% Cu, 6% to 15% Pt, 14% to 20% Re, 15% to 20% Ir, and 5% to 12% W, which totals 100%.

[0028] The present invention also provides a laser alloy composite coating, which is manufactured by laser melting the above laser alloy and an adhesive, wherein the mass ratio of the laser alloy to the adhesive is 1:0.03-0.08.

[0029] Note: The combination of laser alloy and adhesive can form a strong bond between the laser alloy and other materials. It is also used for surface coating to improve the wear resistance, corrosion resistance and surface hardness of the material. If the adhesive mass ratio is too low, the bonding strength between the laser alloy and other materials will be weakened, and the coating will be prone to damage such as pores and cracks, and the wear resistance and hardness improvement effects will be limited. Conversely, if the adhesive mass ratio is too high, not only will the relative content of the laser alloy be reduced, resulting in a decrease in the hardness and wear resistance of the composite structure; it will also be difficult to control the thickness and uniformity of the coating, resulting in extended drying time and incomplete curing. Taking all factors into consideration, the mass ratio of laser alloy to adhesive is set at 1:0.03~0.08.

[0030] The present invention also provides a method for preparing the above-mentioned laser alloy composite coating, comprising the following steps:

[0031] S1. Weigh the following raw materials in mass percentage respectively: 20%-28% Mo, 20%-25% Si, 1%-5% Cu, 6%-15% Pt, 14%-20% Re, 15%-20% Ir, 5%-12% W; add a binder to the weighed raw materials and mix well to obtain an alloy powder coating;

[0032] S2. Apply the alloy powder coating to the surface of a substrate (titanium alloy, 17-4PH alloy, nickel-based alloy, Q235, 40Ag or 304L stainless steel) to form an alloy powder coating, and overlap-scan the alloy powder coating with a laser in an inert gas atmosphere to melt it to obtain a laser alloy composite coating. During the laser melting process, Si dissolves in the Mo element to form a [Si, Mo] substitutional solid solution. Through lattice distortion and redistribution of electron clouds, the electrode potential of the alloy changes, reducing the activity of the alloy in the corrosive medium, thereby improving the corrosion resistance; Cu and Mo form Mo-Cu alloys. Through surface treatment and alloying processes, the corrosion resistance of the alloy can be improved by electroplating technology, adjusting the molybdenum-copper ratio and changing the microstructure of the alloy; Pt and Mo form intermetallic compounds. By controlling the preparation process of the alloy and adjusting the generation amount and distribution of the intermetallic compounds, they form a strengthening layer on the alloy surface or in the area worn during friction, thereby effectively improving the wear resistance of the alloy; Re and Mo can form a solid solution alloy, which can increase the electrode potential of the alloy, reduce the anodic dissolution reaction, and thus enhance the corrosion resistance of the alloy; W and Mo The Mo-W alloy is formed, and the grains of the Mo-W alloy are refined by controlling the solidification process, which can effectively improve the wear resistance of the composite coating; Cu and Si form copper-silicon compounds, and the formation of Cu3Si can reduce the microscopic defects inside the alloy and improve the corrosion resistance of the alloy; Re and Si form ReSi2, and the presence of ReSi2 helps to refine the grains, change the oxidation path and rate, and improve the oxidation resistance of the alloy; W and Si form Si-W alloy, which enhances the corrosion resistance of the alloy by changing the anodic dissolution reaction of the alloy in the corrosive medium; Mo, Si and Cu can form a [Si, Cu, Mo] ternary solid solution, which has a solid solution strengthening effect on the matrix and can improve the strength, hardness and oxidation resistance of the alloy; Si and Re elements form tungsten-silicon binary alloy and W-Re alloy with W element respectively, which can significantly improve the wear resistance of the composite coating. Because Mo, Cu, Pt, and Ir inherently possess excellent corrosion and oxidation resistance, they significantly enhance the wear and oxidation resistance of composite coatings. Cu and Si react with oxygen in the air to form Cu2O and SiO2 oxide films, while Mo reacts with oxygen to form a thin, dense MoO3 film, which forms a dense oxide protective layer under high temperature conditions. These reactions among the alloying elements impart excellent corrosion, oxidation, and wear resistance to the resulting composite coating.

[0033] As a preferred embodiment, the adhesive is composed of the following raw materials in percentage by mass: 20%-25% acrylate polymer, 22%-30% modified polyether resin, 15%-25% phenol, and 20%-30% acetone, totaling 100%. Note: Acrylate polymer: Has good wear resistance. If its content is too low, the adhesion and durability of the coating will decrease; if its content is too high, the coating will increase in brittleness. Modified polyether resin can improve the corrosion resistance of the coating. If its content is too low, it will affect the wear resistance of the coating; if its content is too high, the coating hardness will decrease. Phenol: Has the function of regulating the rheology of the system and increasing viscosity. Acetone: Has good fluidity and coating properties, enabling it to be evenly applied to the substrate surface to form a smooth, even coating. Taking all factors into consideration, 20%-25% acrylate polymer, 22%-30% modified polyether resin, 15%-25% phenol, and 20%-30% acetone total 100%.

[0034] As a preferred embodiment, the ultrasonic parameters are: ultrasonic frequency is 20kHz~50kHz, amplitude is 5μm~20μm, and vibration time is the entire laser scanning process.

[0035] Note: If the ultrasonic frequency is too low, the vibration energy is insufficient, the cavitation effect is weakened, the melt pool fluidity is poor, and the removal of pores and impurities is difficult. If the ultrasonic frequency is too high, the energy decay is accelerated, and the vibration effect is limited to the surface, making it difficult to penetrate the melt pool. Furthermore, high-frequency vibration may cause local overheating of the melt pool, disrupting the uniformity of the coating and inducing microcracks. If the amplitude is too low, the vibration energy is insufficient to overcome the surface tension of the melt pool, failing to effectively remove gases, resulting in poor coating density and low bonding strength. If the amplitude is too high, the violent vibration may cause melt spattering, uneven coating thickness, damage the coating structure of the substrate surface oxide layer, and introduce new porosity. If the vibration is applied only for a portion of the time, differential solidification in different areas of the melt pool will lead to uneven stress distribution, potentially causing cracks and delamination in the coating. For these reasons, the ultrasonic parameters selected are: ultrasonic frequency of 20kHz to 50kHz, amplitude of 5μm to 20μm, and vibration time corresponding to the entire laser scanning process.

[0036] As a preferred embodiment, the thickness of the alloy powder coating is 0.2-1.3 mm.

[0037] Note: If the coating thickness is too small, not only will corrosive media easily penetrate, causing damage such as rust to the substrate, but the coating will also easily wear through, exacerbating material wear and affecting performance and life. If the coating thickness is too large, it will firstly lead to excessive material use and unnecessary waste; secondly, during the coating process, the thicker coating will be difficult to evenly cover the substrate surface; finally, it will cause internal stress concentration in the coating, which can easily cause cracking and shedding, affecting the overall performance of the coating. Taking all factors into consideration, the coating thickness should be between 0.2 and 1.3 mm.

[0038] As a preferred embodiment, the laser parameters are: laser power of 1200W~3000W, laser scanning speed of 150mm / min~350mm / min, and spot diameter of 2mm~6mm.

[0039] Note: If the laser power is too low, the material surface will not receive sufficient energy to achieve the rapid heating and cooling quenching process. If the laser power is too high, it will cause quenching cracks, deformation, or melting on the material surface. If the scanning rate is too low, the material will deform and crack due to excessive heat during cladding and heat treatment, which will also reduce processing efficiency and quality, and increase processing costs. If the scanning speed is too fast, the material will not receive sufficient heat, resulting in ineffective melting. A small spot diameter can achieve high-precision and high-energy density processing. Conversely, a large spot diameter will result in reduced processing accuracy. However, it can improve processing efficiency. Considering the above reasons, the selected laser power is 1200-3000W, the laser scanning speed is 150-350mm / min, and the spot diameter is 2-6mm.

[0040] As a preferred embodiment, the inert gas is argon, and the argon flow rate is 8 L / min to 25 L / min.

[0041] Note: When the flow rate is too low, the processing area will be difficult to be covered by the inert gas during high-temperature processing. When the flow rate is too high, long processing times will significantly increase gas consumption. Based on the material properties, the inert gas type selected is argon. Considering all factors, the selected argon flow rate is 8 to 25 L / min.

[0042] As a preferred embodiment, before the alloy powder coating is applied to the surface of the substrate, the impurities and oxygen layer on the surface of the substrate are cleaned. First, the polished substrate is sent to an ultrasonic cleaning machine and cleaned in anhydrous alcohol and acetone using 15kHz~30kHz ultrasound for 10min~12min.

[0043] The composite coating prepared by the present invention using Mo, Si, Cu, Pt, Re, Ir and W powders as raw materials has zero cracks and an anti-oxidation rate of 0.3 g / mm under high temperature conditions. 2 •h, wear loss can be as low as 0.8g, corrosion current as low as 3μA / cm 2 ; It is confirmed that the alloy powder designed by the present invention is very suitable for laser additive manufacturing.

[0044] The present invention will be described in detail below through the following examples and comparative examples. Example 1

[0045] A laser alloy of MoSiCuPtReIrW powder is composed of the following raw materials in percentage by mass: 25% Mo, 20% Si, 3% Cu, 10% Pt, 20% Re, 15% Ir, and 7% W.

[0046] The method for preparing the laser alloy composite coating produced by laser melting the laser alloy comprises the following steps:

[0047] S1, uniformly mixing 25% by mass of an acrylic acid ester polymer, 30% by mass of a modified polyether resin, 20% by mass of a phenol, and 25% by mass of an acetone to obtain an adhesive;

[0048] S2. Weigh alloy powders containing 25% Mo, 20% Si, 3% Cu, 10% Pt, 20% Re, 15% Ir, and 7% W by mass, and mix the laser alloy and the binder in a mass ratio of 1:0.04 to obtain an alloy powder coating.

[0049] S3, sending the titanium alloy substrate after surface polishing into the ultrasonic generator 5, and cleaning it in anhydrous ethanol and 98.5% purity acetone using 18kHz ultrasonic waves for 12 minutes;

[0050] S4. After cleaning the substrate surface, perform surface roughening by sandblasting using 80-mesh brown corundum sand to improve the bonding strength between the coating and the substrate;

[0051] S5. After the substrate is cleaned, the alloy powder is evenly applied on the surface of the substrate to form an alloy powder coating layer 9 with a thickness of 0.8 mm. After the coating is completed, the substrate with the coating is dried, and the substrate 8 coated with the alloy powder coating is placed on the workbench 7 and firmly clamped by the clamp 10. At the same time, the substrate and the coating on its surface are preheated with a spray gun to effectively reduce the internal stress generated during the subsequent laser alloying operation. Subsequently, the ultrasonic vibration head 11 connected to the ultrasonic generator is placed on the center point of the substrate, the ultrasonic generator 5 is turned on, the ultrasonic frequency is set to 30 kHz, the amplitude is 10 μm, and the ultrasonic vibration head 11 is used to apply vibration to the substrate. The vibration continues until the scanning is completed. Then, the fiber laser 3 is turned on to carry out the laser alloying operation on the area to be processed, and finally an alloy coating is formed; specifically: turn on the delivery The powder dispensing device 1 is switched on and off, and the valve of the argon cylinder 2 is opened to deliver argon gas to the laser head 6 at a stable flow rate of 18 L / min and blow it evenly onto the surface of the substrate 8; the ultrasonic generator 5 is turned on, and the ultrasonic vibration head 11 is connected to the ultrasonic generator. The fiber laser 3 is turned on and the laser power is adjusted to 2800 W, the laser scanning speed is 200 mm / min, and the spot diameter is 4 mm. The laser beam is irradiated from the laser head 6 to the surface of the alloy powder coating layer 9. The control system 4 is used to regulate the workbench 7 and the laser head 6. Through the control system 4, the workbench 7 is driven to move left and right along the X-axis, and the laser head 6 is controlled to move forward and backward along the Y-axis or up and down along the Z-axis. The alloy powder coating layer 9 is laser alloyed by the laser beam;

[0052] S6. After the laser beam scans the alloy powder coating layer 9, turn off the fiber laser 3, turn off the ultrasonic generator 5, turn off the powder feeder 1, turn off the argon gas cylinder 2, and the control system 4 controls the workbench 7 to drive the laser head 6 back to the original position. Example 2

[0053] A laser alloy of MoSiCuPtReIrW powder is composed of the following raw materials in percentage by mass: 25% Mo, 22% Si, 2% Cu, 8% Pt, 16% Re, 20% Ir, and 7% W.

[0054] The method for preparing the laser alloy composite coating produced by laser melting the laser alloy comprises the following steps:

[0055] S1, uniformly mixing 25% by mass of an acrylic acid ester polymer, 30% by mass of a modified polyether resin, 15% by mass of a phenol, and 30% by mass of an acetone to obtain an adhesive;

[0056] S2. Weigh alloy powders containing 25% Mo, 22% Si, 2% Cu, 8% Pt, 16% Re, 20% Ir, and 7% W by mass, and mix the laser alloy and the binder in a mass ratio of 1:0.05 to obtain an alloy powder coating.

[0057] S3, the 17-4PH substrate with a polished surface is sent to the ultrasonic generator 5, and cleaned in anhydrous ethanol and 98.5% purity acetone using 18kHz ultrasonic waves for 12 minutes;

[0058] S4. After cleaning the substrate surface, perform surface roughening by sandblasting using 80-mesh brown corundum sand to improve the bonding strength between the coating and the substrate;

[0059] S5. After the substrate is cleaned, the alloy powder is evenly applied on the surface of the substrate to form an alloy powder coating layer 9 with a thickness of 0.8 mm. After the coating is completed, the substrate with the coating is dried, and the substrate 8 coated with the alloy powder coating is placed on the workbench 7 and firmly clamped by the clamp 10. At the same time, the substrate and the coating on its surface are preheated with a spray gun to effectively reduce the internal stress generated during the subsequent laser alloying operation. Subsequently, the ultrasonic vibration head 11 connected to the ultrasonic generator is placed on the center point of the substrate, the ultrasonic generator 5 is turned on, the ultrasonic frequency is set to 30 kHz, the amplitude is 10 μm, and the ultrasonic vibration head 11 is used to apply vibration to the substrate. The vibration continues until the scanning is completed. Then, the fiber laser 3 is turned on to carry out the laser alloying operation on the area to be processed, and finally an alloy coating is formed; specifically: turn on the delivery The powder dispensing device 1 is switched on and off, and the valve of the argon cylinder 2 is opened to deliver argon gas to the laser head 6 at a stable flow rate of 18 L / min and blow it evenly onto the surface of the substrate 8; the ultrasonic generator 5 is turned on, and the ultrasonic vibration head 11 is connected to the ultrasonic generator. The fiber laser 3 is turned on and the laser power is adjusted to 2800 W, the laser scanning speed is 200 mm / min, and the spot diameter is 4 mm. The laser beam is irradiated from the laser head 6 to the surface of the alloy powder coating layer 9. The control system 4 is used to regulate the workbench 7 and the laser head 6. Through the control system 4, the workbench 7 is driven to move left and right along the X-axis, and the laser head 6 is controlled to move forward and backward along the Y-axis or up and down along the Z-axis. The alloy powder coating layer 9 is laser alloyed by the laser beam;

[0060] S6. After the laser beam scans the alloy powder coating layer 9, turn off the fiber laser 3, turn off the ultrasonic generator 5, turn off the powder feeder 1, turn off the argon gas cylinder 2, and the control system 4 controls the workbench 7 to drive the laser head 6 back to the original position. Example 3

[0061] A laser alloy of MoSiCuPtReIrW powder is composed of the following raw materials in percentage by mass: 26% Mo, 21% Si, 5% Zn, 12% Pt, 14% Re, 16% Ir, and 6% W.

[0062] The method for preparing the laser alloy composite coating produced by laser melting the laser alloy comprises the following steps:

[0063] S1, mixing 20% by mass of an acrylic acid ester polymer, 25% by mass of a modified polyether resin, 25% by mass of a phenol, and 30% by mass of an acetone to obtain an adhesive;

[0064] S2. Weigh alloy powders containing 26% Mo, 21% Si, 5% Zn, 12% Pt, 14% Re, 16% Ir, and 6% W by mass, and mix the laser alloy and the binder in a mass ratio of 1:0.06 to obtain an alloy powder coating.

[0065] S3, the polished Monel400 substrate is fed into an ultrasonic generator 5, and cleaned in anhydrous ethanol and 98.5% purity acetone using 18kHz ultrasonic waves for 12 minutes;

[0066] S4. After cleaning the substrate surface, perform surface roughening by sandblasting using 80-mesh brown corundum sand to improve the bonding strength between the coating and the substrate;

[0067] S5. After the substrate is cleaned, the alloy powder is evenly applied on the surface of the substrate to form an alloy powder coating layer 9 with a thickness of 0.8 mm. After the coating is completed, the substrate with the coating is dried, and the substrate 8 coated with the alloy powder coating is placed on the workbench 7 and firmly clamped by the clamp 10. At the same time, the substrate and the coating on its surface are preheated with a spray gun to effectively reduce the internal stress generated during the subsequent laser alloying operation. Subsequently, the ultrasonic vibration head 11 connected to the ultrasonic generator is placed on the center point of the substrate, the ultrasonic generator 5 is turned on, the ultrasonic frequency is set to 30 kHz, the amplitude is 10 μm, and the ultrasonic vibration head 11 is used to apply vibration to the substrate. The vibration continues until the scanning is completed. Then, the fiber laser 3 is turned on to carry out the laser alloying operation on the area to be processed, and finally an alloy coating is formed; specifically: turn on the delivery The powder dispensing device 1 is switched on and off, and the valve of the argon cylinder 2 is opened to deliver argon gas to the laser head 6 at a stable flow rate of 18 L / min and blow it evenly onto the surface of the substrate 8; the ultrasonic generator 5 is turned on, and the ultrasonic vibration head 11 is connected to the ultrasonic generator. The fiber laser 3 is turned on and the laser power is adjusted to 2800 W, the laser scanning speed is 200 mm / min, and the spot diameter is 4 mm. The laser beam is irradiated from the laser head 6 to the surface of the alloy powder coating layer 9. The control system 4 is used to regulate the workbench 7 and the laser head 6. Through the control system 4, the workbench 7 is driven to move left and right along the X-axis, and the laser head 6 is controlled to move forward and backward along the Y-axis or up and down along the Z-axis. The alloy powder coating layer 9 is laser alloyed by the laser beam;

[0068] S6. After the laser beam scans the alloy powder coating layer 9, turn off the fiber laser 3, turn off the ultrasonic generator 5, turn off the powder feeder 1, turn off the argon gas cylinder 2, and the control system 4 controls the workbench 7 to drive the laser head 6 back to the original position. Example 4

[0069] A laser alloy of MoSiCuPtReIrW powder is composed of the following raw materials in percentage by mass: 24% Mo, 23% Si, 4% Cu, 9% Pt, 15% Re, 17% Ir, and 8% W.

[0070] The method for preparing the laser alloy composite coating produced by laser melting the laser alloy comprises the following steps:

[0071] S1. Evenly mix 25% by mass of an acrylic acid ester polymer, 22% by mass of a modified polyether resin, 23% by mass of a phenol, and 30% by mass of an acetone to obtain an adhesive;

[0072] S2. Weigh alloy powders containing 24% Mo, 23% Si, 4% Cu, 9% Pt, 15% Re, 17% Ir, and 8% W by mass, and mix the laser alloy and the binder in a mass ratio of 1:0.07 to obtain an alloy powder coating.

[0073] S3, the polished Q235 substrate is sent to the ultrasonic generator 5, and cleaned in anhydrous ethanol and 98.5% purity acetone using 18kHz ultrasonic waves for 12 minutes;

[0074] S4. After cleaning the substrate surface, perform surface roughening by sandblasting using 80-mesh brown corundum sand to improve the bonding strength between the coating and the substrate;

[0075] S5. After the substrate is cleaned, the alloy powder is evenly applied on the surface of the substrate to form an alloy powder coating layer 9 with a thickness of 0.8 mm. After the coating is completed, the substrate with the coating is dried, and the substrate 8 coated with the alloy powder coating is placed on the workbench 7 and firmly clamped by the clamp 10. At the same time, the substrate and the coating on its surface are preheated with a spray gun to effectively reduce the internal stress generated during the subsequent laser alloying operation. Subsequently, the ultrasonic vibration head 11 connected to the ultrasonic generator is placed on the center point of the substrate, the ultrasonic generator 5 is turned on, the ultrasonic frequency is set to 30 kHz, the amplitude is 10 μm, and the ultrasonic vibration head 11 is used to apply vibration to the substrate. The vibration continues until the scanning is completed. Then, the fiber laser 3 is turned on to carry out the laser alloying operation on the area to be processed, and finally an alloy coating is formed; specifically: turn on the delivery The powder dispensing device 1 is switched on and off, and the valve of the argon cylinder 2 is opened to deliver argon gas to the laser head 6 at a stable flow rate of 18 L / min and blow it evenly onto the surface of the substrate 8; the ultrasonic generator 5 is turned on, and the ultrasonic vibration head 11 is connected to the ultrasonic generator. The fiber laser 3 is turned on and the laser power is adjusted to 2800 W, the laser scanning speed is 200 mm / min, and the spot diameter is 4 mm. The laser beam is irradiated from the laser head 6 to the surface of the alloy powder coating layer 9. The control system 4 is used to regulate the workbench 7 and the laser head 6. Through the control system 4, the workbench 7 is driven to move left and right along the X-axis, and the laser head 6 is controlled to move forward and backward along the Y-axis or up and down along the Z-axis. The alloy powder coating layer 9 is laser alloyed by the laser beam;

[0076] S6. After the laser beam scans the alloy powder coating layer 9, turn off the fiber laser 3, turn off the ultrasonic generator 5, turn off the powder feeder 1, turn off the argon gas cylinder 2, and the control system 4 controls the workbench 7 to drive the laser head 6 back to the original position. Example 5

[0077] A laser alloy of MoSiCuPtReIrW powder is composed of the following raw materials in percentage by mass: 28% Mo, 20% Si, 1% Cu, 6% Pt, 18% Re, 18% Ir, and 9% C.

[0078] The method for preparing the laser alloy composite coating produced by laser melting the laser alloy comprises the following steps:

[0079] S1, 25% by mass of acrylic acid ester polymer, 30% by mass of modified polyether resin, 20% by mass of phenol, and 25% by mass of acetone were mixed to obtain an adhesive;

[0080] S2. Weigh alloy powders containing 28% Mo, 20% Si, 1% Cu, 6% Pt, 18% Re, 18% Ir, and 9% C by mass, and mix the laser alloy and the binder in a mass ratio of 1:0.08 to obtain an alloy powder coating.

[0081] S3, the 40r substrate with polished surface is sent to the ultrasonic generator 5, and cleaned in anhydrous alcohol and 98.5% purity acetone using 18kHz ultrasonic waves for 12 minutes;

[0082] S4. After cleaning the substrate surface, perform surface roughening by sandblasting using 80-mesh brown corundum sand to improve the bonding strength between the coating and the substrate;

[0083] S5. After the substrate is cleaned, the alloy powder is evenly applied on the surface of the substrate to form an alloy powder coating layer 9 with a thickness of 0.8 mm. After the coating is completed, the substrate with the coating is dried, and the substrate 8 coated with the alloy powder coating is placed on the workbench 7 and firmly clamped by the clamp 10. At the same time, the substrate and the coating on its surface are preheated with a spray gun to effectively reduce the internal stress generated during the subsequent laser alloying operation. Subsequently, the ultrasonic vibration head 11 connected to the ultrasonic generator is placed on the center point of the substrate, the ultrasonic generator 5 is turned on, the ultrasonic frequency is set to 30 kHz, the amplitude is 10 μm, and the ultrasonic vibration head 11 is used to apply vibration to the substrate. The vibration continues until the scanning is completed. Then, the fiber laser 3 is turned on to carry out the laser alloying operation on the area to be processed, and finally an alloy coating is formed; specifically: turn on the delivery The powder dispensing device 1 is switched on and off, and the valve of the argon cylinder 2 is opened to deliver argon gas to the laser head 6 at a stable flow rate of 18 L / min and blow it evenly onto the surface of the substrate 8; the ultrasonic generator 5 is turned on, and the ultrasonic vibration head 11 is connected to the ultrasonic generator. The fiber laser 3 is turned on and the laser power is adjusted to 2800 W, the laser scanning speed is 200 mm / min, and the spot diameter is 4 mm. The laser beam is irradiated from the laser head 6 to the surface of the alloy powder coating layer 9. The control system 4 is used to regulate the workbench 7 and the laser head 6. Through the control system 4, the workbench 7 is driven to move left and right along the X-axis, and the laser head 6 is controlled to move forward and backward along the Y-axis or up and down along the Z-axis. The alloy powder coating layer 9 is laser alloyed by the laser beam;

[0084] S6. After the laser beam scans the alloy powder coating layer 9, turn off the fiber laser 3, turn off the ultrasonic generator 5, turn off the powder feeder 1, turn off the argon gas cylinder 2, and the control system 4 controls the workbench 7 to drive the laser head 6 back to the original position. Example 6

[0085] A laser alloy of MoSiCuPtReIrW powder is composed of the following raw materials in percentage by mass: 28% Mo, 20% Si, 2% Cu, 10% Pt, 14% Re, 16% Ir, and 10% W.

[0086] The method for preparing the laser alloy composite coating produced by laser melting the laser alloy comprises the following steps:

[0087] S1, mixing 30% by mass of an acrylic acid ester polymer, 25% by mass of a modified polyether resin, 15% by mass of a phenol, and 30% by mass of an acetone to obtain an adhesive;

[0088] S2. Weigh alloy powders containing 28% Mo, 20% Si, 2% Cu, 10% Pt, 14% Re, 16% Ir, and 10% W by mass, and mix the laser alloy and the binder in a mass ratio of 1:0.04 to obtain an alloy powder coating.

[0089] S3, the 304L stainless steel substrate with a polished surface is sent to the ultrasonic generator 5, and cleaned in anhydrous alcohol and 98.5% purity acetone using 18kHz ultrasonic waves for 12 minutes;

[0090] S4. After cleaning the substrate surface, perform surface roughening by sandblasting using 80-mesh brown corundum sand to improve the bonding strength between the coating and the substrate;

[0091] S5. After the substrate is cleaned, the alloy powder is evenly applied on the surface of the substrate to form an alloy powder coating layer 9 with a thickness of 0.8 mm. After the coating is completed, the substrate with the coating is dried, and the substrate 8 coated with the alloy powder coating is placed on the workbench 7 and firmly clamped by the clamp 10. At the same time, the substrate and the coating on its surface are preheated with a spray gun to effectively reduce the internal stress generated during the subsequent laser alloying operation. Subsequently, the ultrasonic vibration head 11 connected to the ultrasonic generator is placed on the center point of the substrate, the ultrasonic generator 5 is turned on, the ultrasonic frequency is set to 30 kHz, the amplitude is 10 μm, and the ultrasonic vibration head 11 is used to apply vibration to the substrate. The vibration continues until the scanning is completed. Then, the fiber laser 3 is turned on to carry out the laser alloying operation on the area to be processed, and finally an alloy coating is formed; specifically: turn on the delivery The powder dispensing device 1 is switched on and off, and the valve of the argon cylinder 2 is opened to deliver argon gas to the laser head 6 at a stable flow rate of 18 L / min and blow it evenly onto the surface of the substrate 8; the ultrasonic generator 5 is turned on, and the ultrasonic vibration head 11 is connected to the ultrasonic generator. The fiber laser 3 is turned on and the laser power is adjusted to 2800 W, the laser scanning speed is 200 mm / min, and the spot diameter is 4 mm. The laser beam is irradiated from the laser head 6 to the surface of the alloy powder coating layer 9. The control system 4 is used to regulate the workbench 7 and the laser head 6. Through the control system 4, the workbench 7 is driven to move left and right along the X-axis, and the laser head 6 is controlled to move forward and backward along the Y-axis or up and down along the Z-axis. The alloy powder coating layer 9 is laser alloyed by the laser beam;

[0092] S6. After the laser beam scans the alloy powder coating layer 9, turn off the fiber laser 3, turn off the ultrasonic generator 5, turn off the powder feeder 1, turn off the argon gas cylinder 2, and the control system 4 controls the workbench 7 to drive the laser head 6 back to the original position. Example 7

[0093] A laser alloy based on MoSiCuPtReIrW powder is composed of the following raw materials in the following mass percentages: 21% Mo, 23% Si, 3% Cu, 14% Pt, 14% Re, 16% Ir, and 9% W.

[0094] The method for preparing the laser alloy composite coating produced by laser melting the laser alloy comprises the following steps:

[0095] S1, 25% by mass of acrylic acid ester polymer, 28% by mass of modified polyether resin, 22% by mass of phenol, and 25% by mass of acetone were mixed to obtain an adhesive;

[0096] S2. Weigh alloy powders containing 21% Mo, 23% Si, 3% Cu, 14% Pt, 14% Re, 16% Ir, and 9% W by mass, and mix the laser alloy and the binder in a mass ratio of 1:0.05 to obtain an alloy powder coating.

[0097] S3, the 40Ag substrate with a polished surface is sent to the ultrasonic generator 5, and cleaned in anhydrous alcohol and 98.5% purity acetone using 18kHz ultrasonic waves for 12 minutes;

[0098] S4. After cleaning the substrate surface, perform surface roughening by sandblasting using 80-mesh brown corundum sand to improve the bonding strength between the coating and the substrate;

[0099] S5. After the substrate is cleaned, the alloy powder is evenly applied on the surface of the substrate to form an alloy powder coating layer 9 with a thickness of 0.8 mm. After the coating is completed, the substrate with the coating is dried, and the substrate 8 coated with the alloy powder coating is placed on the workbench 7 and firmly clamped by the clamp 10. At the same time, the substrate and the coating on its surface are preheated with a spray gun to effectively reduce the internal stress generated during the subsequent laser alloying operation. Subsequently, the ultrasonic vibration head 11 connected to the ultrasonic generator is placed on the center point of the substrate, the ultrasonic generator 5 is turned on, the ultrasonic frequency is set to 30 kHz, the amplitude is 10 μm, and the ultrasonic vibration head 11 is used to apply vibration to the substrate. The vibration continues until the scanning is completed. Then, the fiber laser 3 is turned on to carry out the laser alloying operation on the area to be processed, and finally an alloy coating is formed; specifically: turn on the delivery The powder dispensing device 1 is switched on and off, and the valve of the argon cylinder 2 is opened to deliver argon gas to the laser head 6 at a stable flow rate of 18 L / min and blow it evenly onto the surface of the substrate 8; the ultrasonic generator 5 is turned on, and the ultrasonic vibration head 11 is connected to the ultrasonic generator. The fiber laser 3 is turned on and the laser power is adjusted to 2400 W, the laser scanning speed is adjusted to 260 mm / min, and the spot diameter is adjusted to 5 mm. The laser beam is irradiated from the laser head 6 to the surface of the alloy powder coating layer 9. The control system 4 is used to regulate the workbench 7 and the laser head 6. Through the control system 4, the workbench 7 is driven to move left and right along the X-axis, and the laser head 6 is controlled to move forward and backward along the Y-axis or up and down along the Z-axis. The alloy powder coating layer 9 is laser alloyed by the laser beam;

[0100] S6. After the laser beam scans the alloy powder coating layer 9, turn off the fiber laser 3, turn off the ultrasonic generator 5, turn off the powder feeder 1, turn off the argon gas cylinder 2, and the control system 4 controls the workbench 7 to drive the laser head 6 back to the original position.

[0101] In order to further illustrate the effect of the present invention, the present invention also provides a comparative example, as follows:

[0102] Comparative Example 1

[0103] Compared with Example 1, the difference is that the Ir element is removed, and the laser alloy is composed of the following raw materials in the following mass percentages: 25% Mo, 24% Si, 5% Cu, 14% Pt, 20% Re, and 10% W.

[0104] A laser alloy of MoSiCuPtReIrW powder is composed of the following raw materials in percentage by mass: 25% Mo, 24% Si, 5% Cu, 14% Pt, 20% Re, and 10% W.

[0105] The method for preparing the laser alloy composite coating produced by laser melting the laser alloy comprises the following steps:

[0106] S1, uniformly mixing 25% by mass of an acrylic acid ester polymer, 30% by mass of a modified polyether resin, 20% by mass of a phenol, and 25% by mass of an acetone to obtain an adhesive;

[0107] S2. Weigh alloy powders containing 25% Mo, 24% Si, 5% Cu, 14% Pt, 20% Re, and 10% W by mass, and mix the laser alloy and the binder in a mass ratio of 1:0.04 to obtain an alloy powder coating.

[0108] S3, sending the titanium alloy substrate after surface polishing into the ultrasonic generator 5, and cleaning it in anhydrous ethanol and 98.5% purity acetone using 18kHz ultrasonic waves for 12 minutes;

[0109] S4. After cleaning the substrate surface, perform surface roughening by sandblasting using 80-mesh brown corundum sand to improve the bonding strength between the coating and the substrate;

[0110] S5. After the substrate is cleaned, the alloy powder is evenly applied on the surface of the substrate to form an alloy powder coating layer 9 with a thickness of 0.8 mm. After the coating is completed, the substrate with the coating is dried, and the substrate 8 coated with the alloy powder coating is placed on the workbench 7 and firmly clamped by the clamp 10. At the same time, the substrate and the coating on its surface are preheated with a spray gun to effectively reduce the internal stress generated during the subsequent laser alloying operation. Subsequently, the ultrasonic vibration head 11 connected to the ultrasonic generator is placed on the center point of the substrate, the ultrasonic generator 5 is turned on, the ultrasonic frequency is set to 30 kHz, the amplitude is 10 μm, and the ultrasonic vibration head 11 is used to apply vibration to the substrate. The vibration continues until the scanning is completed. Then, the fiber laser 3 is turned on to carry out the laser alloying operation on the area to be processed, and finally an alloy coating is formed; specifically: turn on the delivery The powder dispensing device 1 is switched on and off, and the valve of the argon cylinder 2 is opened to deliver argon gas to the laser head 6 at a stable flow rate of 18 L / min and blow it evenly onto the surface of the substrate 8; the ultrasonic generator 5 is turned on, and the ultrasonic vibration head 11 is connected to the ultrasonic generator. The fiber laser 3 is turned on and the laser power is adjusted to 2800 W, the laser scanning speed is 200 mm / min, and the spot diameter is 4 mm. The laser beam is irradiated from the laser head 6 to the surface of the alloy powder coating layer 9. The control system 4 is used to regulate the workbench 7 and the laser head 6. Through the control system 4, the workbench 7 is driven to move left and right along the X-axis, and the laser head 6 is controlled to move forward and backward along the Y-axis or up and down along the Z-axis. The alloy powder coating layer 9 is laser alloyed by the laser beam;

[0111] S6. After the laser beam scans the alloy powder coating layer 9, turn off the fiber laser 3, turn off the ultrasonic generator 5, turn off the powder feeder 1, turn off the argon gas cylinder 2, and the control system 4 controls the workbench 7 to drive the laser head 6 back to the original position.

[0112] Comparative Example 2

[0113] Compared with Example 1, the difference is that the W element is removed, and the laser alloy is composed of the following raw materials in the following mass percentages: 25% Mo, 20% Si, 3% Cu, 14% Pt, 18% Re, and 20% Ir.

[0114] A laser alloy of MoSiCuPtReIrW powder is composed of the following raw materials in percentage by mass: 25% Mo, 20% Si, 3% Cu, 14% Pt, 18% Re, and 20% Ir.

[0115] The method for preparing the laser alloy composite coating produced by laser melting the laser alloy comprises the following steps:

[0116] S1, uniformly mixing 25% by mass of an acrylic acid ester polymer, 30% by mass of a modified polyether resin, 20% by mass of a phenol, and 25% by mass of an acetone to obtain an adhesive;

[0117] S2. Weigh alloy powders containing 25% Mo, 20% Si, 3% Cu, 14% Pt, 18% Re, and 20% Ir by mass, and mix the laser alloy and the binder in a mass ratio of 1:0.04 to obtain an alloy powder coating.

[0118] S3, sending the titanium alloy substrate after surface polishing into the ultrasonic generator 5, and cleaning it in anhydrous ethanol and 98.5% purity acetone using 18kHz ultrasonic waves for 12 minutes;

[0119] S4. After cleaning the substrate surface, perform surface roughening by sandblasting using 80-mesh brown corundum sand to improve the bonding strength between the coating and the substrate;

[0120] S5. After the substrate is cleaned, the alloy powder is evenly applied on the surface of the substrate to form an alloy powder coating layer 9 with a thickness of 0.8 mm. After the coating is completed, the substrate with the coating is dried, and the substrate 8 coated with the alloy powder coating is placed on the workbench 7 and firmly clamped by the clamp 10. At the same time, the substrate and the coating on its surface are preheated with a spray gun to effectively reduce the internal stress generated during the subsequent laser alloying operation. Subsequently, the ultrasonic vibration head 11 connected to the ultrasonic generator is placed on the center point of the substrate, the ultrasonic generator 5 is turned on, the ultrasonic frequency is set to 30 kHz, the amplitude is 10 μm, and the ultrasonic vibration head 11 is used to apply vibration to the substrate. The vibration continues until the scanning is completed. Then, the fiber laser 3 is turned on to carry out the laser alloying operation on the area to be processed, and finally an alloy coating is formed; specifically: turn on the delivery The powder dispensing device 1 is switched on and off, and the valve of the argon cylinder 2 is opened to deliver argon gas to the laser head 6 at a stable flow rate of 18 L / min and blow it evenly onto the surface of the substrate 8; the ultrasonic generator 5 is turned on, and the ultrasonic vibration head 11 is connected to the ultrasonic generator. The fiber laser 3 is turned on and the laser power is adjusted to 2800 W, the laser scanning speed is 200 mm / min, and the spot diameter is 4 mm. The laser beam is irradiated from the laser head 6 to the surface of the alloy powder coating layer 9. The control system 4 is used to regulate the workbench 7 and the laser head 6. Through the control system 4, the workbench 7 is driven to move left and right along the X-axis, and the laser head 6 is controlled to move forward and backward along the Y-axis or up and down along the Z-axis. The alloy powder coating layer 9 is laser alloyed by the laser beam;

[0121] S6. After the laser beam scans the alloy powder coating layer 9, turn off the fiber laser 3, turn off the ultrasonic generator 5, turn off the powder feeder 1, turn off the argon gas cylinder 2, and the control system 4 controls the workbench 7 to drive the laser head 6 back to the original position.

[0122] Comparative Example 3

[0123] Compared with Example 1, the difference is that the Si element is removed, and the laser alloy is composed of the following raw materials in the following mass percentages: 28% Mo, 5% Cu, 15% Pt, 20% Re, 20% Ir, and 12% W.

[0124] A laser alloy of MoSiCuPtReIrW powder is composed of the following raw materials in percentage by mass: 28% Mo, 5% Cu, 15% Pt, 20% Re, 20% Ir, and 12% W.

[0125] The method for preparing the laser alloy composite coating produced by laser melting the laser alloy comprises the following steps:

[0126] S1, uniformly mixing 25% by mass of an acrylic acid ester polymer, 30% by mass of a modified polyether resin, 20% by mass of a phenol, and 25% by mass of an acetone to obtain an adhesive;

[0127] S2. Weigh alloy powders containing 28% Mo, 5% Cu, 15% Pt, 20% Re, 20% Ir, and 12% W by mass, and mix the laser alloy and the binder in a mass ratio of 1:0.04 to obtain an alloy powder coating.

[0128] S3, sending the titanium alloy substrate after surface polishing into the ultrasonic generator 5, and cleaning it in anhydrous ethanol and 98.5% purity acetone using 18kHz ultrasonic waves for 10 minutes;

[0129] S4. After cleaning the substrate surface, perform surface roughening by sandblasting using 80-mesh brown corundum sand to improve the bonding strength between the coating and the substrate;

[0130] S5. After the substrate is cleaned, the alloy powder is evenly applied on the surface of the substrate to form an alloy powder coating layer 9 with a thickness of 0.8 mm. After the coating is completed, the substrate with the coating is dried, and the substrate 8 coated with the alloy powder coating is placed on the workbench 7 and firmly clamped by the clamp 10. At the same time, the substrate and the coating on its surface are preheated with a spray gun to effectively reduce the internal stress generated during the subsequent laser alloying operation. Subsequently, the ultrasonic vibration head 11 connected to the ultrasonic generator is placed on the center point of the substrate, the ultrasonic generator 5 is turned on, the ultrasonic frequency is set to 30 kHz, the amplitude is 10 μm, and the ultrasonic vibration head 11 is used to apply vibration to the substrate. The vibration continues until the scanning is completed. Then, the fiber laser 3 is turned on to carry out the laser alloying operation on the area to be processed, and finally an alloy coating is formed; specifically: turn on the delivery The powder dispensing device 1 is switched on and off, and the valve of the argon cylinder 2 is opened to deliver argon gas to the laser head 6 at a stable flow rate of 18 L / min and blow it evenly onto the surface of the substrate 8; the ultrasonic generator 5 is turned on, and the ultrasonic vibration head 11 is connected to the ultrasonic generator. The fiber laser 3 is turned on and the laser power is adjusted to 2800 W, the laser scanning speed is 200 mm / min, and the spot diameter is 4 mm. The laser beam is irradiated from the laser head 6 to the surface of the alloy powder coating layer 9. The control system 4 is used to regulate the workbench 7 and the laser head 6. Through the control system 4, the workbench 7 is driven to move left and right along the X-axis, and the laser head 6 is controlled to move forward and backward along the Y-axis or up and down along the Z-axis. The alloy powder coating layer 9 is laser alloyed by the laser beam;

[0131] S6. After the laser beam scans the alloy powder coating layer 9, turn off the fiber laser 3, turn off the ultrasonic generator 5, turn off the powder feeder 1, turn off the argon gas cylinder 2, and the control system 4 controls the workbench 7 to drive the laser head 6 back to the original position.

[0132] Comparative Example 4

[0133] Compared with Example 1, the difference is that the Pt element is removed, and the laser alloy is composed of the following raw materials in the following mass percentages: 28% Mo, 22% Si, 5% Cu, 20% Re, 18% Ir, and 12% W.

[0134] A laser alloyed layer of MoSiCuPtReIrW powder, wherein the laser alloy is composed of the following raw materials in the following mass percentages: 28% Mo, 22% Si, 5% Cu, 20% Re, 18% Ir, and 12% W.

[0135] The method for preparing the laser alloy composite coating produced by laser melting the laser alloy comprises the following steps:

[0136] S1, uniformly mixing 25% by mass of an acrylic acid ester polymer, 30% by mass of a modified polyether resin, 20% by mass of a phenol, and 25% by mass of an acetone to obtain an adhesive;

[0137] S2. Weigh alloy powders containing 28% Mo, 22% Si, 5% Cu, 20% Re, 18% Ir, and 12% W by mass, and mix the laser alloy and the binder in a mass ratio of 1:0.04 to obtain an alloy powder coating.

[0138] S3, sending the titanium alloy substrate after surface polishing into the ultrasonic generator 5, and cleaning it in anhydrous ethanol and 98.5% purity acetone using 18kHz ultrasonic waves for 12 minutes;

[0139] S4. After cleaning the substrate surface, perform surface roughening by sandblasting using 80-mesh brown corundum sand to improve the bonding strength between the coating and the substrate;

[0140] S5. After the substrate is cleaned, the alloy powder is evenly applied on the surface of the substrate to form an alloy powder coating layer 9 with a thickness of 0.8 mm. After the coating is completed, the substrate with the coating is dried, and the substrate 8 coated with the alloy powder coating is placed on the workbench 7 and firmly clamped by the clamp 10. At the same time, the substrate and the coating on its surface are preheated with a spray gun to effectively reduce the internal stress generated during the subsequent laser alloying operation. Subsequently, the ultrasonic vibration head 11 connected to the ultrasonic generator is placed on the center point of the substrate, the ultrasonic generator 5 is turned on, the ultrasonic frequency is set to 30 kHz, the amplitude is 10 μm, and the ultrasonic vibration head 11 is used to apply vibration to the substrate. The vibration continues until the scanning is completed. Then, the fiber laser 3 is turned on to carry out the laser alloying operation on the area to be processed, and finally an alloy coating is formed; specifically: turn on the delivery The powder dispensing device 1 is switched on and off, and the valve of the argon cylinder 2 is opened to deliver argon gas to the laser head 6 at a stable flow rate of 18 L / min and blow it evenly onto the surface of the substrate 8; the ultrasonic generator 5 is turned on, and the ultrasonic vibration head 11 is connected to the ultrasonic generator. The fiber laser 3 is turned on and the laser power is adjusted to 2800 W, the laser scanning speed is 200 mm / min, and the spot diameter is 4 mm. The laser beam is irradiated from the laser head 6 to the surface of the alloy powder coating layer 9. The control system 4 is used to regulate the workbench 7 and the laser head 6. Through the control system 4, the workbench 7 is driven to move left and right along the X-axis, and the laser head 6 is controlled to move forward and backward along the Y-axis or up and down along the Z-axis. The alloy powder coating layer 9 is laser alloyed by the laser beam;

[0141] S6. After the laser beam scans the alloy powder coating layer 9, turn off the fiber laser 3, turn off the ultrasonic generator 5, turn off the powder feeder 1, turn off the argon gas cylinder 2, and the control system 4 controls the workbench 7 to drive the laser head 6 back to the original position.

[0142] Comparative Example 5

[0143] Compared with Example 1, the difference is that the amount of W element is increased, and the laser alloy is composed of the following raw materials in the following mass percentages: 22% Mo, 20% Si, 1% Cu, 10% Pt, 14% Re, 15% Ir, and 18% W.

[0144] A laser alloying layer of MoSiCuPtReIrW powder is provided. The coating is composed of the following raw materials in the following mass percentages: 22% Mo, 20% Si, 1% Cu, 10% Pt, 14% Re, 15% Ir, and 18% W.

[0145] The method for preparing the laser alloy composite coating produced by laser melting the laser alloy comprises the following steps:

[0146] S1, uniformly mixing 25% by mass of an acrylic acid ester polymer, 30% by mass of a modified polyether resin, 20% by mass of a phenol, and 25% by mass of an acetone to obtain an adhesive;

[0147] S2. Weigh alloy powders containing 22% Mo, 20% Si, 1% Cu, 10% Pt, 14% Re, 15% Ir, and 18% W by mass, and mix the powders with the binder in a mass ratio of 1:0.04 to obtain an alloy powder coating.

[0148] S3, sending the titanium alloy substrate after surface polishing into the ultrasonic generator 5, and cleaning it in anhydrous ethanol and 98.5% purity acetone using 18kHz ultrasonic waves for 12 minutes;

[0149] S4. After cleaning the substrate surface, perform surface roughening by sandblasting using 80-mesh brown corundum sand to improve the bonding strength between the coating and the substrate;

[0150] S5. After the substrate is cleaned, the alloy powder is evenly applied on the surface of the substrate to form an alloy powder coating layer 9 with a thickness of 0.8 mm. After the coating is completed, the substrate with the coating is dried, and the substrate 8 coated with the alloy powder coating is placed on the workbench 7 and firmly clamped by the clamp 10. At the same time, the substrate and the coating on its surface are preheated with a spray gun to effectively reduce the internal stress generated during the subsequent laser alloying operation. Subsequently, the ultrasonic vibration head 11 connected to the ultrasonic generator is placed on the center point of the substrate, the ultrasonic generator 5 is turned on, the ultrasonic frequency is set to 30 kHz, the amplitude is 10 μm, and the ultrasonic vibration head 11 is used to apply vibration to the substrate. The vibration continues until the scanning is completed. Then, the fiber laser 3 is turned on to carry out the laser alloying operation on the area to be processed, and finally an alloy coating is formed; specifically: turn on the delivery The powder dispensing device 1 is switched on and off, and the valve of the argon cylinder 2 is opened to deliver argon gas to the laser head 6 at a stable flow rate of 18 L / min and blow it evenly onto the surface of the substrate 8; the ultrasonic generator 5 is turned on, and the ultrasonic vibration head 11 is connected to the ultrasonic generator. The fiber laser 3 is turned on and the laser power is adjusted to 2800 W, the laser scanning speed is 200 mm / min, and the spot diameter is 4 mm. The laser beam is irradiated from the laser head 6 to the surface of the alloy powder coating layer 9. The control system 4 is used to regulate the workbench 7 and the laser head 6. Through the control system 4, the workbench 7 is driven to move left and right along the X-axis, and the laser head 6 is controlled to move forward and backward along the Y-axis or up and down along the Z-axis. The alloy powder coating layer 9 is laser alloyed by the laser beam;

[0151] S6. After the laser beam scans the alloy powder coating layer 9, turn off the fiber laser 3, turn off the ultrasonic generator 5, turn off the powder feeder 1, turn off the argon gas cylinder 2, and the control system 4 controls the workbench 7 to drive the laser head 6 back to the original position.

[0152] Comparative Example 6

[0153] Compared with Example 1, the difference is that the amount of Re element is increased, and the laser alloy is composed of the following raw materials in the following mass percentages: 20% Mo, 20% Si, 1% Cu, 8% Pt, 30% Re, 15% Ir, and 6% W.

[0154] A laser alloying layer of MoSiCuPtReIrW powder is provided. The coating is composed of the following raw materials in the following mass percentages: 20% Mo, 20% Si, 1% Cu, 8% Pt, 30% Re, 15% Ir, and 6% W.

[0155] The method for preparing the laser alloy composite coating produced by laser melting the laser alloy comprises the following steps:

[0156] S1, uniformly mixing 25% by mass of an acrylic acid ester polymer, 30% by mass of a modified polyether resin, 20% by mass of a phenol, and 25% by mass of an acetone to obtain an adhesive;

[0157] S2. Weigh alloy powders containing 20% Mo, 20% Si, 1% Cu, 8% Pt, 30% Re, 15% Ir, and 6% W by mass, and mix the laser alloy and the binder in a mass ratio of 1:0.04 to obtain an alloy powder coating.

[0158] S3, sending the titanium alloy substrate after surface polishing into the ultrasonic generator 5, and cleaning it in anhydrous ethanol and 98.5% purity acetone using 18kHz ultrasonic waves for 12 minutes;

[0159] S4. After cleaning the substrate surface, perform surface roughening by sandblasting using 80-mesh brown corundum sand to improve the bonding strength between the coating and the substrate;

[0160] S5. After the substrate is cleaned, the alloy powder is evenly applied on the surface of the substrate to form an alloy powder coating layer 9 with a thickness of 0.8 mm. After the coating is completed, the substrate with the coating is dried, and the substrate 8 coated with the alloy powder coating is placed on the workbench 7 and firmly clamped by the clamp 10. At the same time, the substrate and the coating on its surface are preheated with a spray gun to effectively reduce the internal stress generated during the subsequent laser alloying operation. Subsequently, the ultrasonic vibration head 11 connected to the ultrasonic generator is placed on the center point of the substrate, the ultrasonic generator 5 is turned on, the ultrasonic frequency is set to 30 kHz, the amplitude is 10 μm, and the ultrasonic vibration head 11 is used to apply vibration to the substrate. The vibration continues until the scanning is completed. Then, the fiber laser 3 is turned on to carry out the laser alloying operation on the area to be processed, and finally an alloy coating is formed; specifically: turn on the delivery The powder dispensing device 1 is switched on and off, and the valve of the argon cylinder 2 is opened to deliver argon gas to the laser head 6 at a stable flow rate of 18 L / min and blow it evenly onto the surface of the substrate 8; the ultrasonic generator 5 is turned on, and the ultrasonic vibration head 11 is connected to the ultrasonic generator. The fiber laser 3 is turned on and the laser power is adjusted to 2800 W, the laser scanning speed is 200 mm / min, and the spot diameter is 4 mm. The laser beam is irradiated from the laser head 6 to the surface of the alloy powder coating layer 9. The control system 4 is used to regulate the workbench 7 and the laser head 6. Through the control system 4, the workbench 7 is driven to move left and right along the X-axis, and the laser head 6 is controlled to move forward and backward along the Y-axis or up and down along the Z-axis. The alloy powder coating layer 9 is laser alloyed by the laser beam;

[0161] S6. After the laser beam scans the alloy powder coating layer 9, turn off the fiber laser 3, turn off the ultrasonic generator 5, turn off the powder feeder 1, turn off the argon gas cylinder 2, and the control system 4 controls the workbench 7 to drive the laser head 6 back to the original position.

[0162] Comparative Example 7

[0163] Compared with Example 1, the difference is that the amount of Si element is increased, and the laser alloy is composed of the following raw materials in the following mass percentages: 20% Mo, 30% Si, 1% Cu, 10% Pt, 16% Re, 18% Ir, and 5% W.

[0164] A laser alloying layer of MoSiCuPtReIrW powder is provided. The coating is composed of the following raw materials in the following mass percentages: 20% Mo, 30% Si, 1% Cu, 10% Pt, 16% Re, 18% Ir, and 5% W.

[0165] The method for preparing the laser alloy composite coating produced by laser melting the laser alloy comprises the following steps:

[0166] S1, uniformly mixing 25% by mass of an acrylic acid ester polymer, 30% by mass of a modified polyether resin, 20% by mass of a phenol, and 25% by mass of an acetone to obtain an adhesive;

[0167] S2. Weigh alloy powders containing 20% Mo, 30% Si, 1% Cu, 10% Pt, 16% Re, 18% Ir, and 5% W by mass, and mix the laser alloy and the binder in a mass ratio of 1:0.04 to obtain an alloy powder coating.

[0168] S3, sending the titanium alloy substrate after surface polishing into the ultrasonic generator 5, and cleaning it in anhydrous ethanol and 98.5% purity acetone using 18kHz ultrasonic waves for 12 minutes;

[0169] S4. After cleaning the substrate surface, perform surface roughening by sandblasting using 80-mesh brown corundum sand to improve the bonding strength between the coating and the substrate;

[0170] S5. After the substrate is cleaned, the alloy powder is evenly applied on the surface of the substrate to form an alloy powder coating layer 9 with a thickness of 0.8 mm. After the coating is completed, the substrate with the coating is dried, and the substrate 8 coated with the alloy powder coating is placed on the workbench 7 and firmly clamped by the clamp 10. At the same time, the substrate and the coating on its surface are preheated with a spray gun to effectively reduce the internal stress generated during the subsequent laser alloying operation. Subsequently, the ultrasonic vibration head 11 connected to the ultrasonic generator is placed on the center point of the substrate, the ultrasonic generator 5 is turned on, the ultrasonic frequency is set to 30 kHz, the amplitude is 10 μm, and the ultrasonic vibration head 11 is used to apply vibration to the substrate. The vibration continues until the scanning is completed. Then, the fiber laser 3 is turned on to carry out the laser alloying operation on the area to be processed, and finally an alloy coating is formed; specifically: turn on the delivery The powder dispensing device 1 is switched on and off, and the valve of the argon cylinder 2 is opened to deliver argon gas to the laser head 6 at a stable flow rate of 18 L / min and blow it evenly onto the surface of the substrate 8; the ultrasonic generator 5 is turned on, and the ultrasonic vibration head 11 is connected to the ultrasonic generator. The fiber laser 3 is turned on and the laser power is adjusted to 2800 W, the laser scanning speed is 200 mm / min, and the spot diameter is 4 mm. The laser beam is irradiated from the laser head 6 to the surface of the alloy powder coating layer 9. The control system 4 is used to regulate the workbench 7 and the laser head 6. Through the control system 4, the workbench 7 is driven to move left and right along the X-axis, and the laser head 6 is controlled to move forward and backward along the Y-axis or up and down along the Z-axis. The alloy powder coating layer 9 is laser alloyed by the laser beam;

[0171] S6. After the laser beam scans the alloy powder coating layer 9, turn off the fiber laser 3, turn off the ultrasonic generator 5, turn off the powder feeder 1, turn off the argon gas cylinder 2, and the control system 4 controls the workbench 7 to drive the laser head 6 back to the original position.

[0172] Comparative Example 8

[0173] Compared with Example 1, the difference is that the amount of Mo element is increased and the amount of Si element is reduced. The laser alloy is composed of the following raw materials in the following mass percentages: 35% Mo, 20% Si, 2% Cu, 8% Pt, 14% Re, 15% Ir, and 6% W.

[0174] A laser alloying layer of MoSiCuPtReIrW powder is provided. The coating is composed of the following raw materials in the following mass percentages: 35% Mo, 20% Si, 2% Cu, 8% Pt, 14% Re, 15% Ir, and 6% W.

[0175] The method for preparing the laser alloy composite coating produced by laser melting the laser alloy comprises the following steps:

[0176] S1, uniformly mixing 25% by mass of an acrylic acid ester polymer, 30% by mass of a modified polyether resin, 20% by mass of a phenol, and 25% by mass of an acetone to obtain an adhesive;

[0177] S2. Weigh alloy powders containing 35% Mo, 20% Si, 2% Cu, 8% Pt, 14% Re, 15% Ir, and 6% W by mass, and mix the laser alloy and the binder in a mass ratio of 1:0.04 to obtain an alloy powder coating.

[0178] S3, sending the titanium alloy substrate after surface polishing into the ultrasonic generator 5, and cleaning it in anhydrous ethanol and 98.5% purity acetone using 18kHz ultrasonic waves for 12 minutes;

[0179] S4. After cleaning the substrate surface, perform surface roughening by sandblasting using 80-mesh brown corundum sand to improve the bonding strength between the coating and the substrate;

[0180] S5. After the substrate is cleaned, the alloy powder is evenly applied on the surface of the substrate to form an alloy powder coating layer 9 with a thickness of 0.8 mm. After the coating is completed, the substrate with the coating is dried, and the substrate 8 coated with the alloy powder coating is placed on the workbench 7 and firmly clamped by the clamp 10. At the same time, the substrate and the coating on its surface are preheated with a spray gun to effectively reduce the internal stress generated during the subsequent laser alloying operation. Subsequently, the ultrasonic vibration head 11 connected to the ultrasonic generator is placed on the center point of the substrate, the ultrasonic generator 5 is turned on, the ultrasonic frequency is set to 30 kHz, the amplitude is 10 μm, and the ultrasonic vibration head 11 is used to apply vibration to the substrate. The vibration continues until the scanning is completed. Then, the fiber laser 3 is turned on to carry out the laser alloying operation on the area to be processed, and finally an alloy coating is formed; specifically: turn on the delivery The powder dispensing device 1 is switched on and off, and the valve of the argon cylinder 2 is opened to deliver argon gas to the laser head 6 at a stable flow rate of 18 L / min and blow it evenly onto the surface of the substrate 8; the ultrasonic generator 5 is turned on, and the ultrasonic vibration head 11 is connected to the ultrasonic generator. The fiber laser 3 is turned on and the laser power is adjusted to 2800 W, the laser scanning speed is 200 mm / min, and the spot diameter is 4 mm. The laser beam is irradiated from the laser head 6 to the surface of the alloy powder coating layer 9. The control system 4 is used to regulate the workbench 7 and the laser head 6. Through the control system 4, the workbench 7 is driven to move left and right along the X-axis, and the laser head 6 is controlled to move forward and backward along the Y-axis or up and down along the Z-axis. The alloy powder coating layer 9 is laser alloyed by the laser beam;

[0181] S6. After the laser beam scans the alloy powder coating layer 9, turn off the fiber laser 3, turn off the ultrasonic generator 5, turn off the powder feeder 1, turn off the argon gas cylinder 2, and the control system 4 controls the workbench 7 to drive the laser head 6 back to the original position.

[0182] Comparative Example 9

[0183] Compared with Example 1, the difference is that the amount of Re element is increased and the amount of Cu element is reduced. The laser alloy is composed of the following raw materials in the following mass percentages: 24% Mo, 20% Si, 1% Cu, 6% Pt, 25% Re, 16% Ir, and 8% W.

[0184] A laser alloying layer of MoSiCuPtReIrW powder is provided. The coating is composed of the following raw materials in the following mass percentages: 24% Mo, 20% Si, 1% Cu, 6% Pt, 25% Re, 16% Ir, and 8% W.

[0185] The method for preparing the laser alloy composite coating produced by laser melting the laser alloy comprises the following steps:

[0186] S1, uniformly mixing 25% by mass of an acrylic acid ester polymer, 30% by mass of a modified polyether resin, 20% by mass of a phenol, and 25% by mass of an acetone to obtain an adhesive;

[0187] S2. Weigh alloy powders containing 24% Mo, 20% Si, 1% Cu, 6% Pt, 25% Re, 16% Ir, and 8% W by mass, and mix the laser alloy and the binder in a mass ratio of 1:0.04 to obtain an alloy powder coating.

[0188] S3, sending the titanium alloy substrate after surface polishing into the ultrasonic generator 5, and cleaning it in anhydrous ethanol and 98.5% purity acetone using 18kHz ultrasonic waves for 12 minutes;

[0189] S4. After cleaning the substrate surface, perform surface roughening by sandblasting using 80-mesh brown corundum sand to improve the bonding strength between the coating and the substrate;

[0190] S5. After the substrate is cleaned, the alloy powder is evenly applied on the surface of the substrate to form an alloy powder coating layer 9 with a thickness of 0.8 mm. After the coating is completed, the substrate with the coating is dried, and the substrate 8 coated with the alloy powder coating is placed on the workbench 7 and firmly clamped by the clamp 10. At the same time, the substrate and the coating on its surface are preheated with a spray gun to effectively reduce the internal stress generated during the subsequent laser alloying operation. Subsequently, the ultrasonic vibration head 11 connected to the ultrasonic generator is placed on the center point of the substrate, the ultrasonic generator 5 is turned on, the ultrasonic frequency is set to 30 kHz, the amplitude is 10 μm, and the ultrasonic vibration head 11 is used to apply vibration to the substrate. The vibration continues until the scanning is completed. Then, the fiber laser 3 is turned on to carry out the laser alloying operation on the area to be processed, and finally an alloy coating is formed; specifically: turn on the delivery The powder dispensing device 1 is switched on and off, and the valve of the argon cylinder 2 is opened to deliver argon gas to the laser head 6 at a stable flow rate of 18 L / min and blow it evenly onto the surface of the substrate 8; the ultrasonic generator 5 is turned on, and the ultrasonic vibration head 11 is connected to the ultrasonic generator. The fiber laser 3 is turned on and the laser power is adjusted to 2800 W, the laser scanning speed is 200 mm / min, and the spot diameter is 4 mm. The laser beam is irradiated from the laser head 6 to the surface of the alloy powder coating layer 9. The control system 4 is used to regulate the workbench 7 and the laser head 6. Through the control system 4, the workbench 7 is driven to move left and right along the X-axis, and the laser head 6 is controlled to move forward and backward along the Y-axis or up and down along the Z-axis. The alloy powder coating layer 9 is laser alloyed by the laser beam;

[0191] S6. After the laser beam scans the alloy powder coating layer 9, turn off the fiber laser 3, turn off the ultrasonic generator 5, turn off the powder feeder 1, turn off the argon gas cylinder 2, and the control system 4 controls the workbench 7 to drive the laser head 6 back to the original position.

[0192] Comparative Example 10

[0193] Compared with Example 1, the difference is that the amount of W element is increased and the amount of Ir element is reduced. The laser alloy is composed of the following raw materials in the following mass percentages: 25% Mo, 20% Si, 3% Cu, 10% Pt, 18% Re, 6% Ir, and 18% W.

[0194] A laser alloying layer of MoSiCuPtReIrW powder is provided. The coating is composed of the following raw materials in the following mass percentages: 25% Mo, 20% Si, 3% Cu, 10% Pt, 18% Re, 6% Ir, and 18% W.

[0195] The method for preparing the laser alloy composite coating produced by laser melting the laser alloy comprises the following steps:

[0196] S1, uniformly mixing 25% by mass of an acrylic acid ester polymer, 30% by mass of a modified polyether resin, 20% by mass of a phenol, and 25% by mass of an acetone to obtain an adhesive;

[0197] S2. Weigh alloy powders containing 25% Mo, 20% Si, 3% Cu, 10% Pt, 18% Re, 6% Ir, and 18% W by mass, and mix the laser alloy and the binder in a mass ratio of 1:0.04 to obtain an alloy powder coating.

[0198] S3, sending the titanium alloy substrate after surface polishing into the ultrasonic generator 5, and cleaning it in anhydrous ethanol and 98.5% purity acetone using 18kHz ultrasonic waves for 12 minutes;

[0199] S4. After cleaning the substrate surface, perform surface roughening by sandblasting using 80-mesh brown corundum sand to improve the bonding strength between the coating and the substrate;

[0200] S5. After the substrate is cleaned, the alloy powder is evenly applied on the surface of the substrate to form an alloy powder coating layer 9 with a thickness of 0.8 mm. After the coating is completed, the substrate with the coating is dried, and the substrate 8 coated with the alloy powder coating is placed on the workbench 7 and firmly clamped by the clamp 10. At the same time, the substrate and the coating on its surface are preheated with a spray gun to effectively reduce the internal stress generated during the subsequent laser alloying operation. Subsequently, the ultrasonic vibration head 11 connected to the ultrasonic generator is placed on the center point of the substrate, the ultrasonic generator 5 is turned on, the ultrasonic frequency is set to 30 kHz, the amplitude is 10 μm, and the ultrasonic vibration head 11 is used to apply vibration to the substrate. The vibration continues until the scanning is completed. Then, the fiber laser 3 is turned on to carry out the laser alloying operation on the area to be processed, and finally an alloy coating is formed; specifically: turn on the delivery The powder dispensing device 1 is switched on and off, and the valve of the argon cylinder 2 is opened to deliver argon gas to the laser head 6 at a stable flow rate of 18 L / min and blow it evenly onto the surface of the substrate 8; the ultrasonic generator 5 is turned on, and the ultrasonic vibration head 11 is connected to the ultrasonic generator. The fiber laser 3 is turned on and the laser power is adjusted to 2800 W, the laser scanning speed is 200 mm / min, and the spot diameter is 4 mm. The laser beam is irradiated from the laser head 6 to the surface of the alloy powder coating layer 9. The control system 4 is used to regulate the workbench 7 and the laser head 6. Through the control system 4, the workbench 7 is driven to move left and right along the X-axis, and the laser head 6 is controlled to move forward and backward along the Y-axis or up and down along the Z-axis. The alloy powder coating layer 9 is laser alloyed by the laser beam;

[0201] S6. After the laser beam scans the alloy powder coating layer 9, turn off the fiber laser 3, turn off the ultrasonic generator 5, turn off the powder feeder 1, turn off the argon gas cylinder 2, and the control system 4 controls the workbench 7 to drive the laser head 6 back to the original position.

[0202] Comparative Example 11

[0203] Compared with Example 1, the difference is that the amount of Re element is increased and the amount of Mo element is reduced. The laser alloy is composed of the following raw materials in the following mass percentages: 18% Mo, 20% Si, 3% Cu, 8% Pt, 30% Re, 15% Ir, and 6% W.

[0204] A laser alloying layer of MoSiCuPtReIrW powder is provided. The coating is composed of the following raw materials in the following mass percentages: 18% Mo, 20% Si, 3% Cu, 8% Pt, 30% Re, 15% Ir, and 6% W.

[0205] The method for preparing the laser alloy composite coating produced by laser melting the laser alloy comprises the following steps:

[0206] S1, uniformly mixing 25% by mass of an acrylic acid ester polymer, 30% by mass of a modified polyether resin, 20% by mass of a phenol, and 25% by mass of an acetone to obtain an adhesive;

[0207] S2. Weigh alloy powders containing 18% Mo, 20% Si, 3% Cu, 8% Pt, 30% Re, 15% Ir, and 6% W by mass, and mix the laser alloy and the binder in a mass ratio of 1:0.04 to obtain an alloy powder coating.

[0208] S3, sending the titanium alloy substrate after surface polishing into the ultrasonic generator 5, and cleaning it in anhydrous ethanol and 98.5% purity acetone using 18kHz ultrasonic waves for 12 minutes;

[0209] S4. After cleaning the substrate surface, perform surface roughening by sandblasting using 80-mesh brown corundum sand to improve the bonding strength between the coating and the substrate;

[0210] S5. After the substrate is cleaned, the alloy powder is evenly applied on the surface of the substrate to form an alloy powder coating layer 9 with a thickness of 0.8 mm. After the coating is completed, the substrate with the coating is dried, and the substrate 8 coated with the alloy powder coating is placed on the workbench 7 and firmly clamped by the clamp 10. At the same time, the substrate and the coating on its surface are preheated with a spray gun to effectively reduce the internal stress generated during the subsequent laser alloying operation. Subsequently, the ultrasonic vibration head 11 connected to the ultrasonic generator is placed on the center point of the substrate, the ultrasonic generator 5 is turned on, the ultrasonic frequency is set to 30 kHz, the amplitude is 10 μm, and the ultrasonic vibration head 11 is used to apply vibration to the substrate. The vibration continues until the scanning is completed. Then, the fiber laser 3 is turned on to carry out the laser alloying operation on the area to be processed, and finally an alloy coating is formed; specifically: turn on the delivery The powder dispensing device 1 is switched on and off, and the valve of the argon cylinder 2 is opened to deliver argon gas to the laser head 6 at a stable flow rate of 18 L / min and blow it evenly onto the surface of the substrate 8; the ultrasonic generator 5 is turned on, and the ultrasonic vibration head 11 is connected to the ultrasonic generator. The fiber laser 3 is turned on and the laser power is adjusted to 2800 W, the laser scanning speed is 200 mm / min, and the spot diameter is 4 mm. The laser beam is irradiated from the laser head 6 to the surface of the alloy powder coating layer 9. The control system 4 is used to regulate the workbench 7 and the laser head 6. Through the control system 4, the workbench 7 is driven to move left and right along the X-axis, and the laser head 6 is controlled to move forward and backward along the Y-axis or up and down along the Z-axis. The alloy powder coating layer 9 is laser alloyed by the laser beam;

[0211] S6. After the laser beam scans the alloy powder coating layer 9, turn off the fiber laser 3, turn off the ultrasonic generator 5, turn off the powder feeder 1, turn off the argon gas cylinder 2, and the control system 4 controls the workbench 7 to drive the laser head 6 back to the original position.

[0212] Comparative Example 12

[0213] Compared with Example 1, the difference is that the amount of Ir element is increased, while the amount of Si and Pt elements is reduced. The laser alloy is composed of the following raw materials in the following mass percentages: 25% Mo, 15% Si, 3% Cu, 2% Pt, 18% Re, 30% Ir, and 7% W.

[0214] A laser alloying layer of MoSiCuPtReIrW powder is provided. The coating is composed of the following raw materials in the following mass percentages: 25% Mo, 15% Si, 3% Cu, 2% Pt, 18% Re, 30% Ir, and 7% W.

[0215] The method for preparing the laser alloy composite coating produced by laser melting the laser alloy comprises the following steps:

[0216] S1, uniformly mixing 25% by mass of an acrylic acid ester polymer, 30% by mass of a modified polyether resin, 20% by mass of a phenol, and 25% by mass of an acetone to obtain an adhesive;

[0217] S2. Weigh alloy powders containing 25% Mo, 15% Si, 3% Cu, 2% Pt, 18% Re, 30% Ir, and 7% W by mass, and mix the laser alloy and the binder in a mass ratio of 1:0.04 to obtain an alloy powder coating.

[0218] S3, sending the titanium alloy substrate after surface polishing into the ultrasonic generator 5, and cleaning it in anhydrous ethanol and 98.5% purity acetone using 18kHz ultrasonic waves for 12 minutes;

[0219] S4. After cleaning the substrate surface, perform surface roughening by sandblasting using 80-mesh brown corundum sand to improve the bonding strength between the coating and the substrate;

[0220] S5. After the substrate is cleaned, the alloy powder is evenly applied on the surface of the substrate to form an alloy powder coating layer 9 with a thickness of 0.8 mm. After the coating is completed, the substrate with the coating is dried, and the substrate 8 coated with the alloy powder coating is placed on the workbench 7 and firmly clamped by the clamp 10. At the same time, the substrate and the coating on its surface are preheated with a spray gun to effectively reduce the internal stress generated during the subsequent laser alloying operation. Subsequently, the ultrasonic vibration head 11 connected to the ultrasonic generator is placed on the center point of the substrate, the ultrasonic generator 5 is turned on, the ultrasonic frequency is set to 30 kHz, the amplitude is 10 μm, and the ultrasonic vibration head 11 is used to apply vibration to the substrate. The vibration continues until the scanning is completed. Then, the fiber laser 3 is turned on to carry out the laser alloying operation on the area to be processed, and finally an alloy coating is formed; specifically: turn on the delivery The powder dispensing device 1 is switched on and off, and the valve of the argon cylinder 2 is opened to deliver argon gas to the laser head 6 at a stable flow rate of 18 L / min and blow it evenly onto the surface of the substrate 8; the ultrasonic generator 5 is turned on, and the ultrasonic vibration head 11 is connected to the ultrasonic generator. The fiber laser 3 is turned on and the laser power is adjusted to 2800 W, the laser scanning speed is 200 mm / min, and the spot diameter is 4 mm. The laser beam is irradiated from the laser head 6 to the surface of the alloy powder coating layer 9. The control system 4 is used to regulate the workbench 7 and the laser head 6. Through the control system 4, the workbench 7 is driven to move left and right along the X-axis, and the laser head 6 is controlled to move forward and backward along the Y-axis or up and down along the Z-axis. The alloy powder coating layer 9 is laser alloyed by the laser beam;

[0221] S6. After the laser beam scans the alloy powder coating layer 9, turn off the fiber laser 3, turn off the ultrasonic generator 5, turn off the powder feeder 1, turn off the argon gas cylinder 2, and the control system 4 controls the workbench 7 to drive the laser head 6 back to the original position.

[0222] The properties of the laser alloy composite coatings of the MoSiCuPtReIrW powders provided in Examples 1 to 7 and Comparative Examples 1 to 12 were tested, and the results are shown in Table 1.

[0223] Table 1 Performance test table of laser alloy composite coatings according to the embodiment of the present invention

[0224]

[0225] As shown in Table 1, the laser alloyed surface of the MoSiCuPtReIrW powder prepared by the present invention has excellent high-temperature oxidation resistance, corrosion resistance, and wear resistance. By introducing ultrasonic vibration, the internal porosity of the coating in Example 1 was reduced to below 0.5%, the grain size was refined to within 5μm, and the bonding strength between the coating and the substrate was increased to 150Mpa, which is about 30% higher than the control group without ultrasound. The alloyed layers of Examples 1 to 7 of the present invention did not produce cracks, and the corrosion current was as low as 3μA / cm2 Under high temperature conditions, the wear loss is as low as 0.8g and the oxidation rate is 0.3g / mm 2 •h, and after adjusting the components and mass percentages of the laser alloying powders in Comparative Examples 1 to 12, respectively, Comparative Examples 1 to 4 lacked a certain element, Comparative Examples 5 to 11 increased or decreased the proportion of a certain element, and Comparative Example 12 increased the Ir element while decreasing the Si and Re elements. The performance of the obtained laser alloying layers did not meet expectations, which was specifically manifested in the presence of more cracks on the alloy surface, and decreased oxidation resistance and corrosion resistance.

[0226] The poor performance of the laser alloy composite coatings obtained in Comparative Examples 1 to 12 is mainly due to the following reasons:

[0227] In Comparative Example 1, the absence of Ir in the alloy at high temperatures reduces the alloy's oxidation resistance because Ir itself forms a dense oxide film at high temperatures, protecting the alloy from corrosion. This lack of Ir increases the ratio of other elements, disrupting inter-element reactions and leading to a decrease in alloy performance.

[0228] In Comparative Example 2, W has good chemical stability and is not prone to chemical reactions with other substances, which can improve the corrosion and wear resistance of the alloy. Therefore, the absence of W will lead to a decrease in the wear resistance and corrosion resistance of the coating alloy.

[0229] In Comparative Example 3, Si, due to its active chemical properties at high temperatures, reacts with oxygen to form a dense silicon dioxide film, which prevents further oxygen contact between the silicon and the coating, thereby improving the alloy's oxidation resistance. The lack of Si would reduce the coating's oxidation resistance, hindering the alloy's performance.

[0230] In Comparative Example 4, Pt has extremely high corrosion resistance. At room temperature, Pt does not react chemically with strong acids and bases. Even at high temperatures, it does not react with sodium hydroxide, sodium carbonate, or aqua regia. The lack of Pt would reduce corrosion resistance and be detrimental to improving alloy performance.

[0231] In Comparative Example 5, the W ratio is increased: Increasing the amount of W will form hard and brittle intermetallic compounds in the alloy, which will easily become crack sources when subjected to stress. Under the action of external force, the cracks are likely to expand, thereby reducing the toughness of the alloy.

[0232] In Comparative Example 6, the Re ratio is increased: Under high-temperature conditions, an oxide film forms on the alloy surface to protect the substrate. However, excessive Re changes the composition and structure of the oxide film, making it looser and reducing the protective effect of the oxide film on the substrate. This accelerates oxidative corrosion of the alloy and reduces the alloy's high-temperature oxidation resistance.

[0233] In Comparative Example 7, the Si ratio is increased, which will change the ratio of other elements, lead to uneven microstructure of the alloy, destroy the reaction between elements, hinder the improvement of alloy performance, and reduce the oxidation resistance and corrosion resistance of the alloy layer.

[0234] In Comparative Example 8, the Mo element is increased and the Si element is decreased: since Si is solid-dissolved in the Mo element to form a [Si, Mo] substitutional solid solution, decreasing the Si element will reduce the generated solid solution and increase the proportion of the Mo element. During the heating process, Mo will react with the O element in the air to generate Mo2O3 at 520°C, MoO3 above 600°C, and MoO2 at 700-800°C. In addition, at 500-800°C, MoO2 further reacts with oxygen to generate MoO3, generating a variety of impurities, which hinder the performance improvement.

[0235] In Comparative Example 9, the Re element is increased and the Cu element is reduced: although Re can improve the strength and hardness of the alloy, excessive Re will cause the toughness of the alloy to be too low, making it brittle and hard; Cu has a high thermal conductivity and plays a good heat dissipation role in the alloy. The reduction of the Cu element will lead to difficulty in heat dissipation during use, and heat is easily accumulated, which in turn affects the performance and stability of the alloy.

[0236] In Comparative Example 10, the W element is increased and the Ir element is reduced: Ir has excellent corrosion resistance, and the reduction of the Ir element will reduce the corrosion resistance of the alloy, making the alloy more susceptible to corrosion; at the same time, Ir has good stability and oxidation resistance at high temperatures, and the reduction of Ir will weaken the oxidation resistance of the alloy under high temperature conditions, while excessive W elements will cause the alloy to form an unstable phase structure at high temperatures, reducing the high-temperature performance of the alloy.

[0237] In Comparative Example 11, the Re element is increased and the Mo element is reduced: Re, W and Mo can form a ternary solid solution of [Mo, W, Re]. When the Re ratio increases and the Mo ratio decreases, the solid solution content will decrease; at the same time, Mo will react with the O element in the air through oxidation to form a thin and dense MoO3 film, which will reduce the toughness of the alloy surface and is not conducive to improving the toughness.

[0238] In Comparative Example 12, the Ir element is increased and the Si and Pt elements are reduced: the Si element forms a stable SiO2 protective film on the surface of the alloy, and the reduction of Si will lead to a decrease in the antioxidant ability; at the same time, the reduction of the Pt element will cause the corrosion resistance of the alloy in a corrosive environment to deteriorate, increasing the risk of corrosion of the alloy; and Ir has the properties of high hardness and poor toughness. Increasing the Ir element content will reduce the overall toughness of the alloy, resulting in an increase in cracks in the alloy layer and a decrease in performance.

[0239] Obviously, those skilled in the art may make various adjustments and modifications to the present invention without departing from its core essence and scope of application. Therefore, as long as such adjustments and modifications are within the scope of the claims and their equivalents, the present invention is intended to include them therein.

Claims

1. A laser alloy composite coating based on MoSiCuPtReIrW powder, characterized in that: The laser alloy and the adhesive are composed in a mass ratio of 1:0.03-0.08, wherein the laser alloy is composed of the following raw materials in mass percentage: 20%-28% Mo, 20%-25% Si, 1%-5% Cu, 6%-15% Pt, 14%-20% Re, 15%-20% Ir, and 5%-12% W, which totals 100%. The preparation method of the laser alloy composite coating is as follows: S1. Weigh the following raw materials in mass percentage respectively: 20%-28% Mo, 20%-25% Si, 1%-5% Cu, 6%-15% Pt, 14%-20% Re, 15%-20% Ir, 5%-12% W, totaling 100%; add a binder to the weighed raw materials and mix well to obtain an alloy powder coating; S2. Applying the alloy powder coating prepared in S1 to the surface of the substrate to form an alloy powder coating, and scanning the alloy powder coating with a laser overlap using an inert gas to melt the coating to obtain a laser alloy composite coating.

2. The laser alloy composite coating based on MoSiCuPtReIrW powder according to claim 1, characterized in that: In the step S2, during the laser scanning process, ultrasonic vibration is applied by the ultrasonic vibration head, the ultrasonic frequency is 20kHz~50kHz, the amplitude is 5μm~20μm, and the vibration time is the entire laser scanning process.

3. The laser alloy composite coating based on MoSiCuPtReIrW powder according to claim 1, characterized in that: The adhesive is composed of the following raw materials in percentage by mass: 20% to 25% of acrylate polymer, 22% to 30% of modified polyether resin, 15% to 25% of phenol, and 20% to 30% of acetone, which totals 100%.

4. The laser alloy composite coating based on MoSiCuPtReIrW powder according to claim 1, characterized in that: The thickness of the alloy powder coating is 0.2-1.3 mm.

5. The laser alloy composite coating based on MoSiCuPtReIrW powder according to claim 1, characterized in that: The laser parameters are: laser power of 1200W~3000W, laser scanning speed of 150mm / min~350mm / min, and spot diameter of 2mm~6mm.

6. The laser alloy composite coating based on MoSiCuPtReIrW powder according to claim 1, characterized in that: The inert gas is argon, and the argon flow rate is 8 L / min to 25 L / min.

7. The laser alloy composite coating based on MoSiCuPtReIrW powder according to claim 1, characterized in that: The substrate is one of titanium alloy, precipitation hardening stainless steel, Q235, 40Cr, nickel-based alloy, and 304L stainless steel.

8. The laser alloy composite coating based on MoSiCuPtReIrW powder according to claim 1, characterized in that: In step S2, before applying the alloy powder coating to the surface of the substrate, the polished substrate is placed in an ultrasonic cleaning machine and cleaned in anhydrous ethanol and acetone using 15kHz to 30kHz ultrasonic waves for 10min to 12min.

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