CN102041500A - Method for preparing high-density reductive metal coating - Google Patents
Method for preparing high-density reductive metal coating Download PDFInfo
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Abstract
The invention provides a method for preparing a high-density reductive metal coating. The method comprises the following steps of: (a) clearing the surface of a substrate to obtain a dry and smooth surface; (2) roughening the obtained dry and smooth surface to obtain a workpiece with a fresh surface with certain roughness, wherein the roughness range is Ra0.1-Ra10; (3) impacting the surface of the obtained workpiece through a gas-solid two-phase flow formed by spray gun accelerated drive gas and metal particles to obtain a coating with a lower density; and (4) bombarding the surface of the workpiece through a gas-solid two-phase flow formed by bombarding gun accelerated drive gas and micro forged particles to obtain a high-density coating. Through the method provided by the invention, the metal coating is denser, the coating density reaches higher than 99 percent, the self strength of the coating is increased by more than 10 percent, and the coating hardness is increased by more than 15 percent. The method has the advantages of simple process, easiness of implementation, short flow, high efficiency, wide application range and good popularization and application prospects.
Description
Technical field
The invention belongs to the Surface Engineering field, relate to the little forging technology of cold air power spraying and coating technology and supersonic speed partickle bombardment, relate in particular to a kind of preparation method of high fine and close reducing metal coating.
Background technology
The cold air power spraying and coating technology is a brand-new metal deposition technique, its principle is to utilize high pressure gas to carry the metal or alloy particulate to add to more than the supersonic speed by special nozzle, the metal or alloy particle collision of high-speed flight is at substrate surface, dual intense plastic strain realization by particulate and substrate is bonding, forms coating.The advantage of cold air power spraying and coating is that the metal or alloy particulate forms coating in the solid-state deposit that temperature is lower than the spray material fusing point, and little to the powder particle heat affecting, the coating performance of preparation is identical with feedstock property basically.The present cold air power spraying and coating technology that studies show that can realize comprising the deposition of metal or alloy such as metal A l, Cu, Ni, Zn, NiCr, its maximum characteristics are to spray the reducing metal that is easy to oxidation, for example Cu and alloy thereof have broad application prospects in metallurgical instrument reparation field.
Chinese patent, patent publication No. CN1781644, patent name " repairing method for thin belt continuous casting crystallining roller " provides a kind of crystal roller surface reparation and surface regeneration technology.Adopt the method for cold air power spraying and coating, utilize pressurized gas to carry the surface of metallic particles with sufficiently high speed bump crystallization roller, metallic particles produces enough distortion and bonds, and regeneration forms the outside surface of crystallization roller geometry in particular.
Chinese patent, patent publication No. CN1782128, patent name " utilizes cold spraying to get superalloy repair ", and a kind of method that is used to repair the parts that formed by the superalloy material is provided, adopt the cold air power spraying and coating technology that the superalloy material is deposited on the parts surface, and cover defective thus.
Chinese patent, patent publication No. CN1781623, patent name " continuous casting crystallining manufacture method " provides a kind of method for producing continuous casting crystalli-zing roll, at first the roller core upper edge of crystallization roller roller core shaft to drive into, posticum, on the roller core wall, have water-guiding hole, be communicated with into and out of the water hole respectively and roller core outer surface; On the roller core outer surface of crystallization roller, metal tube is installed, respectively by the water-guiding hole on the roller core wall with is communicated with a plurality of cooling loops of formation into and out of the water hole, formation crystallization roller cooling system; Adopt cold air power spraying and coating, to drive metallic particles with high-speed impact crystallization roller roller core outer surface greater than the 1.0MPa pressed gas, enough distortion take place and are bonded on crystallization roller roller core surface and the cooling loop outside surface in metallic particles, filling pore, and then form enough coat-thicknesses cooling loop is buried fully, and the crystallization roll sleeve of formation adequate thickness, finish the manufacturing of crystallization roller.
Chinese patent, patent publication No. CN1781643, patent name " repairing method for crystallizer copper plate ", a kind of repairing method for crystallizer copper plate is provided, adopt the method for aerodynamic force spraying, drive the surface that the minute metallic particle need be repaired with sufficiently high speed bump crystallizer with high pressure compressed gas, enough viscous deformation take place and are bonded in and form new surface on the surface of crystallizer in molecule, fill crack or wearing and tearing groove etc.
Chinese patent, patent publication No. CN2754775, patent name " thin band continuous casting crystallization roller " provides a kind of thin band continuous casting crystallization roller, and the crystallization roll sleeve adopts the cold air power spraying and coating metal refining to form.
Yet, often there is a large amount of pores in conventional cold air power spraying and coating coating and because of the defective of the insufficient formation of particle deformation, the coating density is low, can only reach between the 85%-95%, and can store a certain amount of high pressure gas in airtight air vent in the metallic coating or the defective, in follow-up heat treatment process, easily expand and grow up, form bigger defective, can reduce conduction, heat conduction, corrosion resisting property and intensity, hardness and the wear resisting property of coating greatly.
Summary of the invention
The preparation method who the purpose of this invention is to provide a kind of high-compactness reducing metal coating, technology is simple, implement easily, flow process is short, the efficient height, wide accommodation, and little forging partickle bombardment forging and cold air power spraying and coating coating be online carrying out simultaneously, do not need extra special equipment, only need to use different types of sprayed particle in the preparation process, promptly can be on the whole surface of workpiece or local surfaces obtain the high-compactness metallic coating, the density of coating reaches more than 99%, far above traditional cold-air powered spraying method coating deposited.
The object of the present invention is achieved like this: a kind of preparation method of high fine and close reducing metal coating comprises following steps:
Step 1: the cleaning matrix surface, can adopt machining process, as polishing, polishing, also can adopt chemical process, as pickling, obtain dry smooth surface;
Step 2: the dry smooth surface to gained carries out the texturing processing, obtains the workpiece of the unsalted surface of certain roughness, and the roughness scope is Ra0.1～Ra10;
Step 3: quicken the workpiece surface of the gas-solid two-phase flow bump gained that driving gas and metallic particles form by spray gun, obtain low density coating;
Step 4: quicken driving gas and the granuloplastic gas-solid two-phase flow bombardment of little forging workpiece surface by the bombardment rifle, obtain high dense coating.
Preferably, the best roughness scope of described step 2 is Ra1.0～Ra5.0.
In above-mentioned steps, the metallic particles in the step 3 can be the hybrid fine particles of one or more alloys in aluminium and aluminium alloy, zinc and zinc alloy, tin and tin alloy, copper and copper alloy, nickel and nickelalloy, chromium and Chrome metal powder, titanium or titanium alloy, iron and iron alloy, cobalt and the cobalt-base alloy.Metallic particles can be spherical, also can be other shape of almost spherical.
The particle size range of particulate is 1～100 μ m, the optimum grain-diameter scope is 5～30 μ m, and the driving gas temperature range is 25～800 ℃, and the driving gas pressure range is 1～5MPa, the monolayer deposition thickness range is 10～500 μ m, and optimum single layer deposit thickness scope is 80～200 μ m.
Adopt the cold air power spraying and coating principle, utilize spray gun to quicken the gas-solid two-phase flow that high pressure gas and reducing metal or alloy particle are formed, make its speed surpass the required critical velocity of metallic coating deposition, high speed metal or alloy particle collision workpiece surface, the formation of deposits coating, this moment, there was more space in coating inside, and density is lower.
In spraying process, the spray gun outlet is 10～60mm with the workpiece spacing range, and the optimal spacing scope is 25～45mm.
Little forging particle in the step 4 is more than 1.5 times of metallic particles hardness, little forging particle here can be aluminum oxide, titanium oxide, zirconium white, yttrium oxide, silicon-dioxide, boron nitride, silicon nitride, silicon carbide, wolfram varbide, diamond, also can be one or more hybrid fine particles in hard chrome, tungstenalloy, rapid steel, superalloy, tantalum alloy, the amorphous alloy.Little forging particle is spherical, and the granularity deviation is no more than 10%.
The particle size range of particulate is 10～2000 μ m, and the optimum grain-diameter scope is 50～500 μ m, and the driving gas temperature range is 25～800 ℃, and the driving gas pressure range is 0.5～3MPa, 50～50000/mm of bombardment density
2Best little forging temperature range is 0.3-0.6T
m, T
mFusing point for prepared coating metal; Best little forging deformation layer scope is 1-1.5H
C, H
CBe single pass coating preparation thickness.
Utilize the bombardment rifle to quicken the gas-solid two-phase flow of high pressure gas and little forging granulometric composition, make little forging particle obtain very high kinetic energy, deposited coatings is bombarded in the front repeatedly, little forging particle realizes that to coating the high frequency microcell forges, make coated material generation intense plastic strain, defectives such as the inner hole of deformation process floating coat, gas bag are subjected to little forging granule impact and merge, disappear, thereby obtain high dense coating;
In spraying process, the outlet of bombardment rifle is 10～150mm with the workpiece spacing range, and the optimal spacing scope is 40～60mm.
Preferably, described spray gun is parallel and be positioned on the same sea line with the bombardment rifle, and the bombardment rifle is positioned at after the spray gun, and spray gun and bombardment rifle are done motion of translation, and workpiece rotates
Preferably, spray gun and bombardment rifle carry out simultaneously or are interrupted and carry out.
In the step 4 of the preparation process of the fine and close reducing metal coating of height:
High dense coating can carry out stress relief annealing to be handled, and also can not carry out anneal; Annealing process can carry out in single pass coating preparation process, also can carry out after coating preparation is finished.
The present invention makes it compared with prior art owing to adopted above technical scheme, has the following advantages and positively effect:
(1) metallic coating of gained is fine and close more, and the coating density reaches more than 99%, far above traditional cold-air powered spraying method coating deposited;
(2) gained metal coating layer material crystal grain is more tiny, and coating self intensity increases more than 10%, and coating hardness increases more than 15%;
(3) gained metallic coating heat conduction, electroconductibility improve more than 5%;
(4) coating deposition and little forging can online finishing of while, do not need specific installation, and efficient is higher;
(5) the metallic coating heat-treat condition reduces greatly, by suitable thermal treatment, eliminates the coating internal stress, adjusts the coating interior tissue, can further promote the density and the use properties of coating.
Description of drawings
The invention will be further described below in conjunction with the drawings and specific embodiments.
Fig. 1 is the auxiliary cold air power spraying and coating principle of the little forging of high velocity particle.
The conventional cold air power spraying and coating CrZrCu of Fig. 2 alloy coat metallograph.
The high fine and close cold air power spraying and coating CrZrCu alloy coat metallograph of Fig. 3.
The conventional cold air power spraying and coating Ni of Fig. 4 alloy coat metallograph.
The high fine and close cold air power spraying and coating Ni alloy coat metallograph of Fig. 5.
Among the figure:
1-workpiece 2-spray gun 3-metallic particles
The little forging particle of 4-bombardment rifle 5-6-spray gun direction of motion
Embodiment
As shown in Figure 1, adopt the cold air power spraying and coating principle, utilize spray gun 2 to quicken the gas-solid two-phase flow of high pressure gas and reducing metal particle 3 compositions, make its speed surpass the required critical velocity of metallic coating deposition, high speed metallic particles 3 striking works 1 surface, the formation of deposits coating, this moment, there was more defective in coating inside, and density is low;
Utilize bombardment rifle 4 to quicken the gas-solid two-phase flow of high pressure gas and little forging particle 5 compositions; make little forging particle obtain very high kinetic energy; deposited coatings is bombarded in the front repeatedly; little forging particle realizes that to coating the high frequency microcell forges; make coated material generation intense plastic strain; defectives such as the inner hole of deformation process floating coat, gas bag are subjected to little forging granule impact and merge, disappear, thereby obtain high dense coating.
In the above-mentioned high dense coating preparation process, spray gun that matrix and mechanical manipulator carry 2 and bombardment rifle 4 are done motion of translation, and workpiece 1 rotates, spray gun 2 and to bombard rifle 4 parallel and be positioned on the same sea line, along the spray gun travel direction, bombardment rifle 4 is positioned at after the spray gun 2.
Be the concrete implementation data of embodiments of the invention below:
Metallic particles is the CrZrCu alloy, sphere, median size 22 μ m; Matrix is the CrZrCu alloy, surface roughness Ra 2.6 μ m, and the surface is fresh, oxidized surface not; Driving gas is an industrial nitrogen, driving gas pressure 2.4MPa, and 400 ℃ of driving gas temperature, spray gun and workpiece surface distance are 30mm, monolayer deposition thickness 100 μ m; Little forging particle is α-Al
2O
3, sphere, median size 80 μ m, driving gas is a nitrogen, driving gas pressure 1.6Mpa, 400 ℃ of driving gas temperature, bombardment rifle and coatingsurface distance are 40mm, 350 ℃ of little forging coating temperature, the average 600/mm of bombardment density
2
As Fig. 2 and shown in Figure 4, common process prepares the cold air power spraying and coating coating, and density is 90%.
As Fig. 3 and shown in Figure 5, use the preparation method of high-compactness reducing metal coating of the present invention, density reaches 99.5%, and the more conventional cold air power spraying and coating coating of density significantly improves.
Embodiment 2
Metallic particles is the Ni alloy, sphere, median size 15 μ m; Matrix is the CrZrCu alloy, surface roughness Ra 2.0 μ m, and the surface is fresh, oxidized surface not; Driving gas is an industrial nitrogen, driving gas pressure 2.8MPa, and 480 ℃ of driving gas temperature, spray gun and workpiece surface distance are 30mm, monolayer deposition thickness 70 μ m; Little forging particle is a yttrium, sphere, and median size 100 μ m, driving gas is a nitrogen, driving gas pressure 1.7Mpa, 500 ℃ of driving gas temperature, bombardment rifle and coatingsurface distance are 33mm, 420 ℃ of little forging coating temperature, the average 500/mm of bombardment density
2
Common process prepares the cold air power spraying and coating coating, and density is 92%; Use the preparation method of high-compactness reducing metal coating of the present invention, density reaches 99.5%.
Embodiment 3
Metallic particles is the Ti alloy, sphere, median size 25 μ m; Matrix is 304 stainless steels, surface roughness Ra 3.2 μ m, and the surface is fresh, oxidized surface not; Driving gas is an industrial nitrogen, driving gas pressure 2.7MPa, and 550 ℃ of driving gas temperature, spray gun and workpiece surface distance are 33mm, monolayer deposition thickness 120 μ m; Little forging particle is a tungsten carbide particle, sphere, and median size 200 μ m, driving gas is a nitrogen, driving gas pressure 2.0Mpa, 600 ℃ of driving gas temperature, bombardment rifle and coatingsurface distance are 38mm, 500 ℃ of little forging coating temperature, the average 400/mm of bombardment density
2
Use the preparation method of high-compactness reducing metal coating of the present invention, prepare cold air power spraying and coating coating density than common process and improve 8%, density reaches 99.5%.
Metallic particles is 304 stainless steels (belonging to a kind of of iron alloy), sphere, median size 18 μ m; Matrix is a plain carbon stool, surface roughness Ra 2.5 μ m, and the surface is fresh, oxidized surface not; Driving gas is an industrial nitrogen, driving gas pressure 4.0MPa, and 750 ℃ of driving gas temperature, spray gun and workpiece surface distance are 25mm, monolayer deposition thickness 80 μ m; Little forging particle is the mixture of wolfram varbide and silicon carbide, sphere, median size 300 μ m, driving gas is a helium, driving gas pressure 2.4Mpa, 750 ℃ of driving gas temperature, bombardment rifle and coatingsurface distance are 28mm, 580 ℃ of little forging coating temperature, the average 360/mm of bombardment density
2
Use 304 stainless steel coating densityes of preparation method's preparation of the present invention to reach 99%.
Metallic particles is an aluminium zinc, sphere, median size 35 μ m; Matrix is 6061 aluminium alloys, surface roughness Ra 4 μ m, and the surface is fresh, oxidized surface not; Driving gas is an industrial nitrogen, driving gas pressure 2.0MPa, and 350 ℃ of driving gas temperature, spray gun and workpiece surface distance are 40mm, monolayer deposition thickness 80 μ m; Little forging particle is a rapid steel, sphere, and median size 200 μ m, driving gas is a pressurized air, driving gas pressure 1.0Mpa, 200 ℃ of driving gas temperature, bombardment rifle and coatingsurface distance are 40mm, 100 ℃ of little forging coating temperature, the average 420/mm of bombardment density
2
Use the preparation method of high-compactness reducing metal coating of the present invention, the aluminium zinc coating density of preparation reaches 99.5%.
Metallic particles is a copper nickel mixture, sphere, median size 20 μ m; Matrix is the CrZrCu alloy, surface roughness Ra 2.9 μ m, and the surface is fresh, oxidized surface not; Driving gas is an industrial nitrogen, driving gas pressure 3.0MPa, and 420 ℃ of driving gas temperature, spray gun and workpiece surface distance are 36mm, monolayer deposition thickness 110 μ m; Little forging particle is a Fe-based amorphous alloy, sphere, median size 400 μ m, driving gas is a helium, driving gas pressure 2.5Mpa, 500 ℃ of driving gas temperature, bombardment rifle and coatingsurface distance are 40mm, 450 ℃ of little forging coating temperature, the average 300/mm of bombardment density
2
Use the preparation method of high-compactness reducing metal coating of the present invention, the copper nickel mixed coating density of preparation reaches 99%.
Embodiment 7
Metallic particles is a nickel aluminium mixture, sphere, median size 30 μ m; Matrix is 6061 aluminium alloys, surface roughness Ra 5.4 μ m, and the surface is fresh, oxidized surface not; Driving gas is an industrial nitrogen, driving gas pressure 2.7MPa, and 400 ℃ of driving gas temperature, spray gun and workpiece surface distance are 40mm, monolayer deposition thickness 160 μ m; Little forging particle is a boron nitride, sphere, median size 800 μ m, driving gas is a high pressure air, driving gas pressure 2.8Mpa, 480 ℃ of driving gas temperature, bombardment rifle and coatingsurface distance are 50mm, 350 ℃ of little forging coating temperature, the average 200/mm of bombardment density
2
Use the preparation method of high-compactness reducing metal coating of the present invention, the nickel aluminium coating density of preparation reaches 99%.
Embodiment 8
Metallic particles is a nichrome, sphere, median size 24 μ m; Matrix is a plain carbon stool, surface roughness Ra 3.5 μ m, and the surface is fresh, oxidized surface not; Driving gas is industrial helium, driving gas pressure 3.8.0MPa, and 650 ℃ of driving gas temperature, spray gun and workpiece surface distance are 30mm, monolayer deposition thickness 120 μ m; Little forging particle is the mixture of wolfram varbide and silicon carbide, sphere, median size 500 μ m, driving gas is a nitrogen, driving gas pressure 2.4Mpa, 750 ℃ of driving gas temperature, bombardment rifle and coatingsurface distance are 35mm, 650 ℃ of little forging coating temperature, the average 180/mm of bombardment density
2
Embodiment 9
Metallic particles is a tin alloy, ellipse, median size 95 μ m; Matrix is an aluminium sheet, surface roughness Ra 9, and the surface is fresh, oxidized surface not; Driving gas is industrial helium, driving gas pressure 2MPa, and 50 ℃ of driving gas temperature, spray gun and workpiece surface distance are 55mm, monolayer deposition thickness 300 μ m; Little forging particle is the mixture of wolfram varbide and silicon carbide, sphere, median size 1500 μ m, driving gas is a nitrogen, driving gas pressure 1MPa, and the driving gas temperature is 25 ℃, bombardment rifle and coatingsurface distance are 120mm, 30 ℃ of little forging coating temperature, the average 80/mm of bombardment density
2
Embodiment 10
Metallic particles is nickelalloy and Chrome metal powder mixture, sphere, median size 7 μ m; Matrix is a fine copper, surface roughness Ra 1.0, and the surface is fresh, oxidized surface not; Driving gas is industrial helium, driving gas pressure 3.5MPa, and 650 ℃ of driving gas temperature, spray gun and workpiece surface distance are 15mm, monolayer deposition thickness 15 μ m; Little forging particle is a silicon carbide, sphere, and median size 20 μ m, driving gas is a nitrogen, driving gas pressure 3.0MPa, 750 ℃ of driving gas temperature, bombardment rifle and coatingsurface distance are 15mm, 700 ℃ of little forging coating temperature, the average 45000/mm of bombardment density
2
Use the preparation method of high-compactness reducing metal coating of the present invention, the nichrome coating density of preparation reaches 99%.
In sum, technology of the present invention is simple, implement easily, flow process is short, efficient height, wide accommodation, do not need extra special equipment, only need to use different types of particle that sprays paint in the preparation process, just can be or local surfaces acquisition high-compactness metallic coating on the whole surface of workpiece, thereby possess good prospect for promotion and application.
Be noted that above enumerate only for several specific embodiments of the present invention, obviously the invention is not restricted to above embodiment, many similar variations are arranged thereupon.If those skilled in the art all should belong to protection scope of the present invention from all distortion that content disclosed by the invention directly derives or associates.
Claims (8)
1. the preparation method of a high fine and close reducing metal coating is characterized in that comprising following steps:
Step 1: the cleaning matrix surface obtains dry smooth surface;
Step 2: the dry smooth surface to gained carries out the texturing processing, obtains the workpiece of the unsalted surface of certain roughness, and the roughness scope is Ra0.1～Ra10;
Step 3: quicken the workpiece surface of the gas-solid two-phase flow bump gained that driving gas and metallic particles form by spray gun, obtain the lower coating of density; Metallic particles is spherical or approximate other shapes of globular, the particle size range of particulate is 1～100 μ m, the driving gas temperature range is 25～800 ℃, the driving gas pressure range is 1～5MPa, the monolayer deposition thickness range is 10～500 μ m, and the spray gun outlet is 10～60mm with the workpiece spacing range;
Step 4: quicken driving gas and the granuloplastic gas-solid two-phase flow bombardment of little forging workpiece surface by the bombardment rifle, obtain high dense coating; Little forging particle is spherical, and the granularity deviation is no more than 10%, and hardness is more than 1.5 times of metallic particles hardness; Little forging particle grain size scope is 10～2000 μ m, and the driving gas temperature range is 25～800 ℃, and the driving gas pressure range is 0.5～3MPa, 50～50000/mm of bombardment density
2, the outlet of bombardment rifle is 10～150mm with the workpiece spacing range; Little forging temperature range is 0.3-0.6T
m, T
mFusing point for prepared coating metal; Little forging deformation layer scope is 1-1.5H
C, H
CBe single pass coating preparation thickness.
2. the preparation method of the fine and close reducing metal coating of height as claimed in claim 1 is characterized in that: the roughness scope of described step 2 is Ra1.0～Ra5.0.
3. the preparation method of the fine and close reducing metal coating of height as claimed in claim 1 is characterized in that: the metallic particles in the described step 3 is the hybrid fine particles of one or more alloys in aluminium and aluminium alloy, zinc and zinc alloy, tin and tin alloy, copper and copper alloy, nickel and nickelalloy, chromium and Chrome metal powder, titanium or titanium alloy, iron and iron alloy, cobalt and the cobalt-base alloy.
4. as the preparation method of claim 1 or the fine and close reducing metal coating of 3 described height, it is characterized in that: the particle size range of described step 3 is 5～30 μ m, the monolayer deposition thickness range is 80～200 μ m, and the spray gun outlet is 25～45mm with the spacing range of workpiece.
5. the preparation method of the fine and close reducing metal coating of height as claimed in claim 1, it is characterized in that: the little forging particle in the described step 4 is aluminum oxide, titanium oxide, zirconium white, yttrium oxide, silicon-dioxide, boron nitride, silicon nitride, silicon carbide, wolfram varbide, diamond, also can be one or more hybrid fine particles in hard chrome, tungstenalloy, rapid steel, superalloy, tantalum alloy, the amorphous alloy.
6. as the preparation method of claim 1 or the fine and close reducing metal coating of 5 described height, it is characterized in that: the particle size range of described step 4 is 50～500 μ m, and the spacing range of outlet of bombardment rifle and workpiece is 40～60mm
7. the preparation method of the fine and close reducing metal coating of height as claimed in claim 1, it is characterized in that: described spray gun is parallel and be positioned on the same sea line with the bombardment rifle, the bombardment rifle is positioned at after the spray gun, and spray gun and bombardment rifle are done motion of translation, and workpiece rotates.
8. as the preparation method of claim 1 or the fine and close reducing metal coating of 7 described height, it is characterized in that: spray gun and bombardment rifle carry out simultaneously or are interrupted and carry out.
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| CN110424003B (en) * | 2019-07-30 | 2021-07-27 | 华东师范大学重庆研究院 | Carbon reinforced metal-ceramic composite material and preparation method and application thereof |
| CN111364036A (en) * | 2020-04-02 | 2020-07-03 | 季华实验室 | Preparation method of iron-based amorphous coating and iron-based amorphous coating |
| CN111364036B (en) * | 2020-04-02 | 2022-03-22 | 季华实验室 | Preparation method of iron-based amorphous coating and iron-based amorphous coating |
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