Zinc-based material powder additive manufacturing system and manufacturing method thereof

Abstract

The invention relates to the technical field of zinc-based material powder additive manufacturing, in particular to a zinc-based material powder additive manufacturing system and a manufacturing method thereof.The zinc-based material powder additive manufacturing method comprises the following steps that zinc-based alloy powder is obtained and subjected to surface activating treatment through plasma jet; determining cold spraying process parameters based on the oxygen content of the activated powder; cold spraying-laser composite deposition is executed, and compact green bodies are formed on the substrate layer by layer; and the metallurgical bonding state between deposits is determined, and selective laser remelting is triggered to eliminate interface defects. According to the method, a composite oxide layer is generated on the surface of the powder through Ar-mixed gas and plasma jet treatment with the power of 8-12 kW, excessive oxidation can be prevented, the powder activity can be improved, and a good foundation is laid for subsequent spraying deposition.

Description

Technical Field

[0001] The present invention relates to the technical field of zinc-based material powder additive manufacturing, and in particular to a zinc-based material powder additive manufacturing system and a manufacturing method thereof. Background Art

[0002] Zinc-based powder is a micron-sized particle material with metallic zinc as the main component. It has long been widely used in the field of anti-corrosion coatings. It has the characteristics of gray metallic luster, high purity, and uniform particle size distribution. Its unique physical and chemical properties, such as being slightly soluble in water, easily soluble in acid / alkali, and having strong reducing properties, make it occupy an important position in the field of anti-corrosion coatings. With the development of industrial technology, the application of zinc-based materials has gradually expanded to mechanical plating, life sciences and new energy fields. Its core application scenarios include the production of zinc-rich primers. Through the cathodic protection effect of high-purity zinc powder, the service life of steel components in the harsh environment of the ocean and industrial atmosphere can be effectively extended. However, the production process of traditional zinc-based materials has problems such as high energy consumption and insufficient force control precision. Summary of the Invention

[0003] The present invention aims to solve the technical problems existing in the prior art and provides a zinc-based material powder additive manufacturing system and a manufacturing method thereof.

[0004] The technical solution of the present invention to solve the above technical problems is as follows: A zinc-based material powder additive manufacturing method comprises the following steps: Obtain zinc-based alloy powder and perform surface activation treatment using a plasma jet, wherein the powder surface temperature is monitored in real time during the plasma treatment and controlled within the range of 300-450°C; Based on the oxygen content of the activated powder ≤ 0.3wt% and the surface roughness Ra0.5-1.2 , dynamically adjust cold spray process parameters; Perform cold spray-laser composite deposition to form a dense green body layer by layer on the substrate, and perform online defect monitoring immediately after each layer is deposited; The metallurgical bonding state between the deposited layers is determined, and the selective laser remelting is triggered by the acoustic emission signal characteristics to eliminate the interface defects.

[0005] Preferably, the plasma activation treatment includes: using a coaxial dual-channel Ar- Mixed gas, inner channel Ar, outer channel Accounting for 5% to 8%, the radio frequency power is 8-12kW, and the plasma density is adjusted in real time by the Langmuir probe to The processing time is 50-100ms. During this period, the powder fluidization state is monitored by high-speed camera to ensure that more than 90% of the powder passes through the plasma core area. The generated nano-ZnO / Zn The composite oxide layer has a columnar crystal structure and a grain size of 20-50 nm.

[0006] Preferably, the dynamic adjustment of the cold spray process parameters includes: establishing an oxygen content-process parameter mapping model: when the oxygen content is 0.1wt%, the gas pressure is 3-4MPa, the temperature is 400-500℃, when the oxygen content ion is 0.2-0.3wt%, the pressure is 4-5MPa, the temperature is 500-600℃, the ion velocity is calibrated in real time by a photon Doppler velocimeter, the error is ±5m / s, and the carrier gas The ratio is adjusted linearly according to the oxygen content. When the oxygen content increases by 0.1%, Increase by 1%, while adding 0.1-0.3vol% C To inhibit secondary oxidation.

[0007] Preferably, the composite deposition is performed by: during cold spray deposition, the spray gun is at an angle of 60° to the substrate, the scanning speed is 200-400 mm / s, and the thickness of the single layer is 100-150 mm. The laser remelting uses a coaxial annular spot with an inner diameter of 1mm, an outer diameter of 3mm, a pulse frequency of 10-50kHz, an energy density of 5-8J / cm², a spot overlap rate of 40%-60%, and a time interval between deposition and remelting of ≤50ms. An infrared thermal imager is used to ensure that the interlayer temperature is maintained at 150-250℃.

[0008] Preferably, the triggering conditions for the laser remelting are: ultrasonic testing shows that the interface porosity is greater than 2%, the center frequency is 20 MHz, the focusing depth is 0.1 mm, the microhardness gradient is greater than 10%, the nanoindentation test, the load is 10 mN, and the remelting parameters are adaptively adjusted according to the defect type: a high frequency of 50 kHz and a low energy of 5 J / cm² are used for pore defects, and a low frequency of 10 kHz and a high energy of 8 J / cm² are used for hardness gradient defects.

[0009] Preferably, the specific process of in-situ generation of the reinforcement phase is as follows: The coated powder undergoes three-step reactions in the laser action area: a) break down: ; b) Zn oxidation: 2Zn+ ; c) Zn eutectic formation: Bi+Zn ; Generated Nano The particles are evenly distributed at the Zn grain boundaries, and the ZnO particles are dispersed within the grains.

[0010] Preferably, the The ALD coating process includes: the precursor uses Bi and The deposition temperature is 150-200℃, the number of cycles is 50-100 times, and the film thickness gradient is controlled: 5-10nm around the powder periphery and 2-5nm near the core area to form a core-shell structure.

[0011] Preferably, the specific construction method of the gradient tissue structure is: Bottom layer: laser energy density 5-8 J / cm², scanning speed 800 mm / s, forming equiaxed crystals; Middle layer: energy density 8-12 J / cm², speed 500 mm / s, forming columnar crystals; Top layer: energy density 12-15 J / cm², speed 300 mm / s, obtain nanocrystals; A transition zone is set between each layer.

[0012] Preferably, the composition optimization of the zinc-based powder includes: Zn-5Al-3Mg-0.5 In AI, AI-Mg It exists in the form of intermetallic compounds with an average size of 1-3 Mg is solid-dissolved in the Zn matrix, with a solid solubility of 4.5-5.5wt%, powder sphericity ≥95%, and hollow powder rate <0.1%.

[0013] The present invention also provides a zinc-based powder additive manufacturing system, comprising: Plasma activation: includes an annular electrode nozzle unit and a powder delivery unit. The annular electrode nozzle unit is equipped with an emission spectrometer to monitor the plasma composition in real time. The carrier gas flow rate of the powder delivery unit is 10-20 L / min, and the powder mass flow rate is 50-200 g / min. Cold spray-laser composite nozzle: includes a cold spray nozzle unit and a laser unit. The throat diameter of the cold spray nozzle unit is 2mm and the expansion ratio is 3:1. The laser unit includes a fiber laser and an integrated galvanometer scanner. Online detection: including ultrasonic detector and component analyzer.

[0014] The beneficial effects of the present invention are: the present invention uses Ar- The mixed gas and 8-12kW power plasma jet treatment generate a composite oxide layer on the powder surface, which can prevent excessive oxidation, improve the activity of the powder, and lay a good foundation for subsequent spray deposition. The carrier gas is dynamically adjusted according to the oxygen content of the powder. The ratio, combined with 3-5MPa gas pressure, 400-600℃ temperature and 600~800m / s particle speed, ensures that powders in different states can achieve high-quality deposition, improves process adaptability and stability, and coats 5-10nm of the powder surface through atomic layer deposition. Nanofilm, 3Zn+ occurs under laser action The laser energy density is increased layer by layer from the substrate to the top layer to form a grain size gradient, so that different parts of the material have adaptive mechanical properties and optimize the overall performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Flowchart of the present invention. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0017] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the described features. In the description of this application, "plurality" means two or more, unless otherwise specifically specified.

[0018] In the description of this application, the term "for example" is used to mean "used as an example, illustration or explanation". Any embodiment described as "for example" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is given to enable any person skilled in the art to implement and use the present invention. In the following description, details are listed for the purpose of explanation. It should be understood that a person of ordinary skill in the art will recognize that the present invention can be implemented without using these specific details. In other examples, well-known structures and processes will not be elaborated in detail to avoid obscuring the description of the present invention with unnecessary details. Therefore, the present invention is not intended to be limited to the embodiments shown, but is consistent with the widest scope consistent with the principles and features disclosed in this application.

[0019] like Figure 1 This embodiment provides: a zinc-based powder additive manufacturing method, comprising the following steps: Obtain zinc-based alloy powder and perform surface activation treatment using a plasma jet, wherein the powder surface temperature is monitored in real time during the plasma treatment and controlled within the range of 300-450°C; Based on the oxygen content of the activated powder ≤ 0.3wt% and the surface roughness Ra0.5-1.2 , dynamically adjust cold spray process parameters; Perform cold spray-laser composite deposition to form a dense green body layer by layer on the substrate, and perform online defect monitoring immediately after each layer is deposited; The metallurgical bonding state between the deposited layers is determined, and the selective laser remelting is triggered by the acoustic emission signal characteristics to eliminate the interface defects.

[0020] Furthermore, the plasma activation treatment includes: using a coaxial dual-channel Ar- Mixed gas, inner channel Ar, outer channel Accounting for 5% to 8%, the radio frequency power is 8-12kW, and the plasma density is adjusted in real time by the Langmuir probe to The processing time is 50-100ms. During this period, the powder fluidization state is monitored by high-speed camera to ensure that more than 90% of the powder passes through the plasma core area. The generated nano-ZnO / Zn The composite oxide layer has a columnar crystal structure and a grain size of 20-50 nm.

[0021] Furthermore, the dynamic adjustment of the cold spray process parameters includes: establishing an oxygen content-process parameter mapping model: when the oxygen content is 0.1wt%, the gas pressure is 3-4MPa, the temperature is 400-500℃, when the oxygen content ion is 0.2-0.3wt%, the pressure is 4-5MPa, the temperature is 500-600℃, the ion velocity is calibrated in real time by a photon Doppler velocimeter, the error is ±5m / s, and the carrier gas The ratio is adjusted linearly according to the oxygen content. When the oxygen content increases by 0.1%, Increase by 1%, while adding 0.1-0.3vol% C To inhibit secondary oxidation.

[0022] It should be noted that the surface activation of zinc-based alloy powder (Zn-5AI-3Mg) is carried out by plasma jet. The core principle is: Plasma activation mechanism: using Ar- Mixed gas ( The high temperature plasma (electron temperature 1-5eV) is generated at a power of 8-12kW to generate nano-scale ZnO / Zn on the powder surface. Composite oxide layer (thickness 10-30nm), which can reduce the critical deposition speed of particles during cold spraying (from the conventional 600m / s to 500m / s), and The reduction effect controls the oxygen content of the powder to 0.3wt%; Dynamic adjustment of cold spray parameters: based on the oxygen content and surface morphology of the activated powder (Ra 0.5-1.2 ), establish the mapping relationship between gas pressure (3-5MPa), temperature (400-600℃), and particle velocity (600-800m / s). When the oxygen content increases by 0.1%, the carrier gas The ratio is increased by 1% to compensate for the loss of deposition efficiency due to oxidation.

[0023] Furthermore, the composite deposition is performed by: during cold spray deposition, the spray gun is at an angle of 60° to the substrate, the scanning speed is 200-400 mm / s, and the thickness of the single layer is 100-150 mm. The laser remelting uses a coaxial annular spot with an inner diameter of 1mm, an outer diameter of 3mm, a pulse frequency of 10-50kHz, an energy density of 5-8J / cm², a spot overlap rate of 40%-60%, and a time interval between deposition and remelting of ≤50ms. An infrared thermal imager is used to ensure that the interlayer temperature is maintained at 150-250℃.

[0024] Furthermore, the triggering conditions for the laser remelting are: ultrasonic testing shows that the interface porosity is greater than 2%, the center frequency is 20 MHz, the focus depth is 0.1 mm, the microhardness gradient is greater than 10%, the nanoindentation test, the load is 10 mN, and the remelting parameters are adaptively adjusted according to the defect type: a high frequency of 50 kHz and a low energy of 5 J / cm² are used for pore defects, and a low frequency of 10 kHz and a high energy of 8 J / cm² are used for hardness gradient defects.

[0025] It should be noted that the core principles of cold spray-laser composite deposition include: Cold spray deposition: The powder is accelerated to 600-800 m / s by supersonic airflow (Mach number 2.5-3.0), and after impacting the substrate, plastic deformation occurs to form a dense layer (single layer thickness 100-150 ), the bonding strength depends on the conversion of particle kinetic energy into thermal energy (local temperature rise 200-300 ° C) and the dynamic recrystallization of Zn / AI / Mg (grain boundary size 0.5-2 ); Laser remelting triggering conditions: 20MHz ultrasonic detection of interface porosity (resolution 0.1mm), when > 2%, trigger pulse laser (1064nm, 5~8J / cm²) selective remelting, laser energy makes the interface micro area (depth 50-100 ) temperature is raised to above the melting point of Zn (419.5℃), the pores are filled by the Marangoni effect (filling rate > 95%), and the hardness gradient is eliminated (the gradient difference is reduced from > 10% to < 3%).

[0026] Furthermore, the specific process of in-situ generation of the reinforcement phase is as follows: The coated powder undergoes three-step reactions in the laser action area: d) break down: (800-1000℃); e) Zn oxidation: 2Zn+ (exothermic reaction); f), Zn eutectic formation: Bi+Zn (Eutectoid point 254℃); Generated Nano The particles are evenly distributed at the Zn grain boundaries, and ZnO particles (20-50nm) are dispersed within the grains.

[0027] Furthermore, the The ALD coating process includes: the precursor uses Bi and The deposition temperature is 150-200℃, the number of cycles is 50-100 times, and the film thickness gradient is controlled: 5-10nm around the powder periphery and 2-5nm near the core area to form a core-shell structure.

[0028] Furthermore, the specific construction method of the gradient organizational structure is as follows: Bottom layer: laser energy density 5~8J / cm², scanning speed 800mm / s, forming equiaxed crystals (50-100 ); Middle layer: energy density 8~12J / cm², speed 500mm / s, forming columnar crystals (20-50 ); Top layer: energy density 12~15J / cm², speed 300mm / s, obtain nanocrystals (10-20 ); A transition zone is set between each layer (energy density gradient, gradient change rate ≤ 2J / cm² / mm).

[0029] It should be noted that in-situ enhancement and gradient structure construction: In-situ reaction: add 0.5-2wt% (ALD coating, thickness 5-10nm) exothermic reaction occurs under laser action ( ), generating nano-Bi particles (50-100nm) and ZnO particles (20-50nm), The particles are distributed at the grain boundaries, suppressing grain boundary slip through the pinning effect (creep rate is reduced by 50%), and ZnO particles strengthen the grains (hardness is increased by 20-30HV); Gradient structure formation mechanism: From the substrate to the top layer, the laser energy density increases from 5J / cm² to 15J / cm², resulting in a difference in heat accumulation effect: the bottom layer forms equiaxed crystals at low temperatures (50-100 ), the top layer high temperature promotes nanocrystals (10-20 ), the transition zone is regulated by a gradient change rate of ≤2J / cm² / mm to avoid thermal stress concentration (residual stress <50MPa, XRD measurement).

[0030] Furthermore, the composition optimization of the zinc-based powder includes: Zn-5Al-3Mg-0.5 In AI, AI-Mg It exists in the form of intermetallic compounds with an average size of 1-3 Mg is solid-dissolved in the Zn matrix with a solid solubility of 4.5-5.5wt%, the powder sphericity is ≥95%, and the hollow powder rate is <0.1% (detected by X-ray tomography).

[0031] The present invention also provides a zinc-based powder additive manufacturing system, comprising: Plasma activation: includes an annular electrode nozzle unit and a powder delivery unit. The annular electrode nozzle unit is equipped with an emission spectrometer to monitor the plasma composition in real time. The carrier gas flow rate of the powder delivery unit is 10-20 L / min, and the powder mass flow rate is 50-200 g / min. Cold spray-laser composite nozzle: includes a cold spray nozzle unit and a laser unit. The throat diameter of the cold spray nozzle unit is 2mm and the expansion ratio is 3:1. The laser unit includes a fiber laser and an integrated galvanometer scanner. Online detection: including ultrasonic detector and component analyzer.

[0032] It should be noted that the powder composition design: Zn-5AI-3Mg-0.5 In AI, AI-Mg It exists in the form of intermetallic compounds, improving high-temperature stability (80% strength retention at 300°C), and the Mg solid solubility of 4.5-5.5wt% improves the matrix strength through solid solution strength (yield strength increased by 40MPa).

[0033] It should be noted that the system integration principle: plasma activation is monitored in real time by OES (750nm) and (656nm) spectral line intensity, feedback adjustment power (accuracy ±0.5kW), cold spray-laser composite nozzle adopts coaxial design, time synchronization accuracy ±1ms, online ultrasonic detection through acoustic impedance matching layer (ZnTe, thickness ) Improve the signal-to-noise ratio by >20dB.

[0034] Example 2 This embodiment provides: a zinc-based material powder additive manufacturing method, comprising the following steps: Plasma activation: using Ar-6% Mixed gas, 10kW power processing 80ms, this parameter can generate an appropriate amount of nano-scale ZnO / Zn on the surface of zinc-based alloy powder The composite oxide layer effectively controls the oxygen content of the powder at a low level, improving the surface activity of the powder while avoiding excessive oxidation and subsequent processing of the image; Cold spraying stage: 4MPa gas pressure, 500℃ temperature, 700m / s particle speed and 6% , ratio, so that the activated powder can be deposited on the substrate in a good state. The appropriate process parameters ensure the uniformity and stability of powder deposition, forming a preliminary deposition layer with a certain density. Then, a pulsed laser with a wavelength of 1064nm, a pulse width of 20ns, and an energy density of 6J / cm² is used for remelting treatment, which effectively improves the internal structure of the deposition layer and enhances the metallurgical bonding between layers.

[0035] Atomic layer deposition: coating the powder surface with 8nm The addition amount is 1wt%. Nano-Bi particles are generated in situ under the action of laser, which plays a role of dispersion strengthening. The final obtained parts show excellent comprehensive performance, with a density of 99.2%, a tensile strength of 280MPa, a hardness of 115HV, and an interface bonding strength of 210MPa.

[0036] Example 3 This embodiment provides: a zinc-based material powder additive manufacturing method, comprising the following steps: Plasma activation: using Ar-8% Mixed gas, 12kW power processing 50ms, higher power and The ratio makes the powder surface activation more intense; Cold spraying stage: 5MPa gas pressure, 600℃ temperature, 800m / s particle speed and 7% , ratio, remelting treatment was performed using a pulsed laser with a wavelength of 1064nm, a pulse width of 10ns, and an energy density of 8J / cm².

[0037] Atomic layer deposition: coating the powder surface with 10nm The addition amount is 2wt%. Nano-Bi particles are generated in situ under the action of laser, which plays a role of dispersion strengthening. The final obtained parts show excellent comprehensive performance, with a density of 99.5%, a tensile strength of 320MPa, a hardness of 135HV, and an interface bonding strength of 240MPa.

[0038] Example 4 This embodiment provides: a zinc-based material powder additive manufacturing method, comprising the following steps: Plasma activation: using Ar-5% Mixed gas, 8kW power processing 100ms; Cold spraying stage: 3MPa gas pressure, 400℃ temperature, 600m / s particle speed and 5% , ratio, remelting treatment was performed using a pulsed laser with a wavelength of 1064nm, a pulse width of 10ns, and an energy density of 15J / cm².

[0039] Atomic layer deposition: coating 5nm on the powder surface The addition amount is 0.5wt%. Nano-Bi particles are generated in situ under the action of laser, which plays a role of dispersion strengthening. The final obtained parts show excellent comprehensive performance, with a density of 99.1%, a tensile strength of 300MPa, a hardness of 125HV, and an interface bonding strength of 190MPa.

[0040] Based on the above table, it is found that the hardness of Example 3 is 17% higher than that of Example 2, indicating the dispersion strengthening effect of nano-Bi particles. Example 4 achieves a synergistic improvement in strength and toughness.

[0041] It should be noted that, in the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant description of other embodiments.

[0042] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0043] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded computer, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0044] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0045] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 The steps for the function specified in one or more boxes.

[0046] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0047] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A zinc-based powder additive manufacturing method, characterized in that: The following steps are involved: Obtain zinc-based alloy powder and perform surface activation treatment through plasma jet; Determine the cold spray process parameters based on the oxygen content of the activated powder; Perform cold spray-laser composite deposition to form a dense green body layer by layer on the substrate; Determine the metallurgical bonding state between deposits and trigger selective laser remelting to eliminate interface defects.

2. A zinc-based powder additive manufacturing method according to claim 1, characterized in that: The plasma activation treatment uses Ar- Mixed gas, The proportion is 5% to 8%, the power is 8-12kW, and the processing time is 50-100ms, so that nano-scale ZnO / Zn is generated on the powder surface. Composite oxide layer, the thickness of the composite oxide layer is 10-30nm.

3. The zinc-based powder additive manufacturing method according to claim 1, characterized in that: The cold spraying process parameters include: gas pressure 3-5MPa, temperature 400-600℃, particle speed 600-800m / s, and adjusting the oxygen content of the carrier gas according to the powder. Proportion.

4. The zinc-based powder additive manufacturing method according to claim 1, characterized in that: The composite deposition process includes: cold spray deposition of a single layer with a thickness of 100-150 , immediately use pulsed laser to scan the deposited layer with an energy density of 5 to 8 J / cm².

5. The zinc-based powder additive manufacturing method according to claim 1, characterized in that: The triggering conditions for laser remelting are: ultrasonic testing shows that the interface porosity is greater than 2% and the microhardness gradient is greater than 10%.

6. The zinc-based powder additive manufacturing method according to claim 1, characterized in that: It also includes in-situ generation of reinforcing phase: adding 0.5-2wt% of , the reaction occurs when the laser is applied: 3Zn+ , generating nano-Bi particles for dispersion strengthening.

7. A zinc-based powder additive manufacturing method according to claim 6, characterized in that: described The addition method is: coating on the powder surface by atomic layer deposition Nanofilm, thickness is 5-10nm.

8. The zinc-based powder additive manufacturing method according to claim 1, characterized in that: It also includes the construction of gradient tissue structure: increasing the laser energy density layer by layer from the substrate to the top layer 5 15J / cm², forming a grain size gradient.

9. The zinc-based powder additive manufacturing method according to claim 1, characterized in that: The composition of the zinc-based powder is: Zn-5Al-3Mg-0.5 , the balance is Zn, and the powder sphericity is ≥95%.

10. A zinc-based powder additive manufacturing system is applied to a zinc-based powder additive manufacturing method according to any one of claims 1 to 9, characterized in that: include: Plasma activation: integrated RF power supply and annular electrode nozzle; Cold spray-laser composite nozzle: realizes coaxial synchronous deposition and remelting; Online ultrasonic detector: includes ultrasonic detector and component analyzer.

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