CN112501537B - Aluminum alloy surface low-temperature brazing modified coating and preparation method thereof - Google Patents
Aluminum alloy surface low-temperature brazing modified coating and preparation method thereof Download PDFInfo
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- CN112501537B CN112501537B CN202011253454.1A CN202011253454A CN112501537B CN 112501537 B CN112501537 B CN 112501537B CN 202011253454 A CN202011253454 A CN 202011253454A CN 112501537 B CN112501537 B CN 112501537B
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/131—Wire arc spraying
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/20—Preliminary treatment of work or areas to be soldered, e.g. in respect of a galvanic coating
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C5/00—Alloys based on noble metals
- C22C5/06—Alloys based on silver
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
- C23C4/08—Metallic material containing only metal elements
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Abstract
The invention discloses a low-temperature brazing modified coating for an aluminum alloy surface, which comprises a priming coat and a modified layer, wherein the priming coat is connected to the surface of an aluminum alloy substrate, and the modified layer is connected to the surface of the priming coat; the priming layer is made of nickel-based alloy material containing aluminum, and the modification layer is made of silver-based alloy material containing nickel. The invention also discloses a preparation method of the aluminum alloy surface low-temperature brazing modified coating, which comprises the steps of surface purification; roughening the surface; preheating; preparing a priming layer; and preparing a modified layer. The invention has the beneficial effects that: the bonding strength of the coating and the substrate is improved, the nickel alloy priming coat can be used as a diffusion barrier layer, the anti-wetting phenomenon during brazing can be effectively prevented, the thickness of a silver-based alloy modified layer can be reduced, and the cost of spraying materials is reduced; the silver alloy low-temperature brazing modified coating can form a good wetting effect with low-temperature solder and is metallurgically bonded, so that the strength of a welded joint can be effectively improved; simple operation, high efficiency, low cost and the like, and the process is environment-friendly and easy to popularize.
Description
Technical Field
The invention relates to a brazing coating, in particular to a low-temperature brazing modified coating on the surface of an aluminum alloy and a preparation method thereof.
Background
The aluminum alloy has the advantages of light weight, excellent processing and forming performance, excellent corrosion resistance and the like, and is widely applied to the field of electronic functional components, particularly to large-size microstrip antennas. The microstrip antenna is mainly designed by loading a plurality of microstrip plates on an aluminum alloy reflecting plate with the length and the width of several meters or even dozens of meters.
The connection between the micro-strip plate and the aluminum alloy mainly comprises two modes of welding and cementing. As in application No.: 201811298019.3, a brazing method for large-area grounding of a microstrip plate, S1, cleaning a welding sheet and a welding surface of a shell; s2, brushing soldering flux on the welding surface of the shell; s3, sequentially mounting the soldering lug, the microstrip plate and the pressing block tool on the welding surface of the shell, wherein the welding lug, the soldering lug and the microstrip plate form a welding assembly; s4, placing the welding assembly on a hot plate for heating; s5, after the soldering lug is heated to be molten, starting a megasonic device to apply megasonic energy to the molten soldering lug; and S6, closing the megasonic device, and stopping heating the hot plate to finish the brazing process. Wherein the shell is a silver-plated aluminum shell.
Because the aluminum alloy has a compact oxide film on the surface, the molten solder is difficult to wet and spread on the surface during low-temperature brazing, and the surface modification before the brazing is selected. The surface of the aluminum alloy is usually plated with a metal layer such as nickel, copper, silver or gold by an electroplating method to realize surface modification of the aluminum alloy, thereby ensuring the weldability during low-temperature brazing. The electroplating modification process is realized by special electroplating equipment and materials, has higher dependence on the processing capacity of the equipment, and also has the problems of environmental pollution and the like. Therefore, for such large-sized aluminum alloy reflective plates exceeding the processing capacity of electroplating equipment, the connection between the reflective plates and the microstrip plate is mostly realized by adopting a gluing mode. However, the cementing material for realizing the connection is an imported conductive adhesive film, and the cementing material has high storage condition requirement, short validity period and high price; most importantly, the reliability of the bonding process is greatly influenced by service environment and conditions. In addition, the technical equipment with the electroplating capacity of the large-size structural part has the problems of high technical risk, long period, high investment cost and the like. Therefore, it is urgently needed to develop an aluminum alloy surface modification method with high feasibility, short period and low cost, so as to realize surface modification of large-size aluminum alloy components and further ensure the weldability of low-temperature brazing.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: how to solve the problems that the large-size aluminum alloy reflecting plate exceeding the processing capacity of electroplating equipment is connected with the micro-strip plate in an adhesive mode, the requirement of adhesive materials is high, and the effective period is short.
The invention solves the technical problems through the following technical means:
the low-temperature brazing modified coating for the aluminum alloy surface comprises a bottom coating and a modified layer, wherein the bottom coating is connected to the surface of an aluminum alloy substrate in a covering mode, and the modified layer is connected to the surface of the bottom coating in a covering mode; the priming layer is made of a nickel-based alloy material containing aluminum, and the modification layer is made of a silver-based alloy material containing nickel.
The interface energy between Ni and Al is low, metallurgical bonding is easy to form, micro-connection is formed, and the bonding strength of the coating and the matrix is improved. In addition, the nickel alloy priming layer can be used as a diffusion barrier layer, so that the anti-wetting phenomenon during brazing can be effectively prevented, the thickness of a silver-based alloy modified layer can be reduced, and the cost of spraying materials can be reduced; the silver alloy low-temperature brazing modified coating can form a good wetting effect with low-temperature solder and is metallurgically bonded, and the strength of a welded joint can be effectively improved.
Preferably, the thickness of the bottom layer is 7-12um, and the nickel-based alloy material comprises 0.5-20% of aluminum by mass.
Preferably, the thickness of the modification layer is 25-35um, and the silver-based alloy material comprises 2% -15% of nickel by mass.
The invention also provides a method for preparing the aluminum alloy surface low-temperature brazing modified coating, which comprises the following steps:
s01, surface purification, namely cleaning the surface of the aluminum alloy substrate;
s02, roughening the surface, namely roughening the aluminum alloy substrate;
s03, preheating, namely preheating the back of the aluminum alloy substrate to be sprayed;
s04, preparing a priming layer, namely covering a nickel alloy material containing aluminum on the surface of an aluminum alloy substrate to form the priming layer;
and S05, preparing a modified layer, namely covering the silver-based alloy material containing nickel on the priming layer to form the modified layer.
The method has the advantages of simple and convenient operation, high efficiency, low cost and the like, can avoid the problem of environmental pollution caused by wet electroplating modification on the surface of the traditional aluminum alloy, has environment-friendly process, and is easy to popularize.
Preferably, in the step S01, the surface of the aluminum alloy substrate is cleaned by using absolute ethyl alcohol, and the surface is kept clean after drying.
Preferably, in the step S02, the aluminum alloy substrate is roughened by a sand blasting process.
Preferably, the preheating temperature in the step S03 is 50 to 100 ℃.
Preferably, in the step S04, a nickel-based alloy spraying wire is used, and an electric arc spraying process is adopted to spray a priming coat on the surface of the aluminum alloy substrate, wherein the nickel-based alloy spraying wire contains 0.5-20% of Al by mass and has a diameter of 2-3mm.
Preferably, in the step S05, a silver-based alloy spraying wire is used, and an electric arc spraying process is adopted to spray a modified layer on the priming layer, wherein the silver-based alloy spraying wire comprises 2-15% of Ni and 0.5-5% of Cu by mass.
Preferably, an electric arc spraying machine is adopted for spraying, the spraying voltage is 25-35V, the spraying current is 150-250A, the spraying gas pressure is 0.2-0.6MPa, the spraying gun distance is 60-200mm, the spraying gun speed is 400-500mm/s, and the used protective gas is one of argon and nitrogen. Or other shielding gas.
The invention has the advantages that:
the interface energy between Ni and Al is low, metallurgical bonding is easy to form, micro-connection is formed, and the bonding strength of the coating and the matrix is improved. In addition, the nickel alloy priming layer can be used as a diffusion barrier layer, so that the anti-wetting phenomenon during brazing can be effectively prevented, the thickness of the silver-based alloy modified layer can be reduced, and the cost of spraying materials can be reduced; the silver alloy low-temperature brazing modified coating can form a good wetting effect with low-temperature solder and is metallurgically bonded, so that the strength of a welded joint can be effectively improved;
the method has the advantages of simple and convenient operation, high efficiency, low cost and the like, can avoid the problem of environmental pollution caused by wet electroplating modification on the surface of the traditional aluminum alloy, and has environment-friendly process and easy popularization.
Drawings
FIG. 1 is a schematic macroscopic view of the connection between the aluminum alloy surface low-temperature brazing modified coating and the aluminum alloy substrate according to the embodiment of the invention;
FIG. 2 is a cross-sectional microscopic view of the modified coating and the surface nickel-plated aluminum alloy low-temperature soldered joint;
FIG. 3 is a schematic macroscopic view of the connection between the second aluminum alloy surface low-temperature brazing modified coating and the aluminum alloy substrate according to the embodiment of the invention;
FIG. 4 is a cross-sectional micrograph of a modified coating and copper alloy low temperature braze joint.
Reference numbers in the figures: 1. an aluminum alloy substrate; 2. priming a bottom layer; 3. a modified layer;
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
As shown in fig. 2 or fig. 4, the modified coating for low-temperature brazing of the surface of the aluminum alloy comprises a composite coating formed by a primer layer 2 and a modified layer 3, wherein the primer layer 2 is connected to the surface of an aluminum alloy substrate 1 in a covering manner, and the modified layer 3 is connected to the surface of the primer layer 2 in a covering manner; the bottom layer 2 is made of a nickel-based alloy material containing aluminum, and the modification layer 3 is made of a silver-based alloy material containing nickel.
Wherein the thickness of the bottom layer 2 is 7-12um, and the nickel-based alloy material contains 0.5-20% of aluminum by mass.
The thickness of the modified layer 3 is 25-35um, and the silver-based alloy material contains 2-15% of nickel by mass.
Ni in the bottom layer 2 and the aluminum substrate form Ni-Al, and Ni in the modified layer 3 and Al in the bottom layer 2 can form Ni-Al; the interface energy between Ni and Al is low, metallurgical bonding is easy to form, micro-connection is formed, and the bonding strength of the coating and the matrix is improved. In addition, the nickel alloy priming layer can be used as a diffusion barrier layer, so that the anti-wetting phenomenon during brazing can be effectively prevented, the thickness of the silver-based alloy modified layer can be reduced, and the cost of spraying materials can be reduced; the silver alloy low-temperature brazing modified coating can form a good wetting effect with low-temperature solder and is metallurgically bonded, and the strength of a welded joint can be effectively improved.
The first embodiment is as follows:
the implementation also provides a preparation method of the aluminum alloy surface low-temperature brazing modified coating, which comprises the following steps:
s01, surface purification, namely cleaning the surface of the aluminum alloy substrate for 5min in absolute ethyl alcohol, and keeping the surface clean after drying;
s02, roughening the surface, namely roughening the aluminum alloy substrate by adopting a sand blasting process;
step S03, preheating treatment, namely preheating the back surface of the roughened surface at the temperature of 80 ℃;
step S04, preparing a priming layer, namely selecting Ni-5wt% Al spraying wires with the diameter of 2mm, and spraying a priming layer with the thickness of about 9 mu m on the roughened surface; spraying voltage of the priming layer is 34V, spraying current is 200A, gas pressure is 0.4MPa, gun distance is 200mm, gun speed is 500mm/s, and protective atmosphere is nitrogen;
s05, selecting Ag-5wt% Ni spraying wires with the diameter of 2mm, and spraying a modified layer with the thickness of about 30 mu m on the priming layer; the spraying voltage of the modified layer is 30V, the spraying current is 180A, the gas pressure is 0.6MPa, the gun distance is 150mm, the gun speed is 500mm/s, and the protective atmosphere is nitrogen.
In this embodiment, the silver-based alloy material is a silver alloy spray wire, and the preparation method thereof is: ball milling 5 mass percent of Ni powder, 0.5 mass percent of Cu powder, a small amount of trace elements and the balance of Ag powder, carrying out hydrogen reduction at 450 ℃, carrying out press forming on the processed powder, and carrying out rotary swaging and drawing to obtain a finished wire with the diameter of 2 mm.
Ni-5wt% Al sprayed wire may be obtained by using a conventional commercially available wire.
As shown in fig. 1, a macroscopic view of the composite coating prepared by the arc spraying process and the aluminum alloy substrate shows that the composite coating has a flat and dense surface and shows a good spraying effect.
As shown in fig. 2, the aluminum alloy surface of the first example (aluminum alloy substrate with composite coating) was modified, and then a low temperature brazing test was performed:
and (3) stacking the aluminum alloy with the composite coating, the Sn63Pb37 soldering lug and the surface nickel-plated aluminum alloy into a sandwich structure from bottom to top, and adding a pressing block above to provide a pressure of 0.002 MPa. And then placing the integral structure in a horizontal vacuum crucible furnace, heating to 250 ℃ according to the heating rate of 8 ℃/min, keeping the temperature for 30min, and taking out the welding part after the temperature of the furnace is reduced to 150 ℃ after the heat preservation stage is finished. Taking the section of the brazing joint for microscopic analysis, as shown in figure 2, the thickness of the composite coating is uniform and compact, and the bottoming layer is tightly combined with the substrate and the modified layer; the metallurgical bonding between the Sn63Pb37 soldering lug and the modified coating is good, and the good joint quality is shown. The modified coating prepared by the method is about 10 mu m thinner than the coating prepared by directly spraying and modifying the silver alloy, so that the material cost is reduced.
Example two:
as shown in fig. 3 and 4, the second embodiment differs from the first embodiment in that: the processing parameters of each step are different;
the preparation method of the modified coating for low-temperature brazing on the surface of the aluminum alloy comprises the following steps:
s01, surface purification, namely cleaning the surface of the aluminum alloy substrate for 5min in absolute ethyl alcohol, and keeping the surface clean after drying;
s02, roughening the surface, namely roughening the aluminum alloy substrate by adopting a sand blasting process;
step S03, preheating treatment, namely preheating the back surface of the roughened surface at the temperature of 80 ℃;
step S04, preparing a priming layer, namely selecting Ni-20wt% Al spraying wires with the diameter of 2mm, and spraying a priming layer with the thickness of about 9 mu m on the roughened surface; spraying voltage of the priming layer is 34V, spraying current is 200A, gas pressure is 0.4MPa, gun distance is 200mm, gun speed is 500mm/s, and protective atmosphere is nitrogen;
s05, selecting Ag-15wt% Ni spraying wires with the diameter of 2mm, and spraying a modified layer with the thickness of about 30 mu m on the priming layer; the spraying voltage of the modified layer is 30V, the spraying current is 180A, the gas pressure is 0.6MPa, the gun distance is 150mm, the gun speed is 500mm/s, and the protective atmosphere is nitrogen;
the silver-based alloy material in the embodiment is a silver alloy spraying wire, and the preparation method comprises the following steps: carrying out ball milling on mixed powder of 15 mass percent of Ni powder, 0.5 mass percent of Cu powder, a small amount of trace elements and the balance of Ag powder, carrying out hydrogen reduction at 450 ℃, carrying out press forming on the processed powder, and carrying out rotary swaging and drawing to obtain a finished wire with the diameter of 2 mm.
Fig. 3 is a macroscopic view of the composite coating prepared by the arc spraying process, and it can be seen that the composite coating has a flat and dense surface and shows a good spraying effect.
As shown in fig. 4, the aluminum alloy surface of the second example (aluminum alloy substrate with composite coating) was modified, and then a low temperature brazing test was performed:
the aluminum alloy with the composite coating, the SnPb eutectic solder and the copper block are stacked into a sandwich structure from bottom to top, and a pressing block is added above the sandwich structure to provide a pressure of 0.002 MPa. And then placing the integral structure in a horizontal vacuum crucible furnace, heating to 250 ℃ according to the heating rate of 8 ℃/min, keeping the temperature for 30min, and taking out the welding part after the temperature of the furnace is reduced to 150 ℃ after the heat preservation stage is finished. Figure 3 is a cross-sectional micrograph of a braze joint. As can be seen from the figure, the bottoming layer is tightly combined with the substrate and the modification layer, the overall densification degree of the composite coating is high, and the thickness is uniform; meanwhile, good metallurgical bonding is formed between the solder and the modified layer, and good joint quality is obtained.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The low-temperature brazing modified coating for the aluminum alloy surface is characterized by comprising a bottom coating layer and a modified layer, wherein the bottom coating layer is connected to the surface of an aluminum alloy substrate in a covering manner through an electric arc spraying process, and the modified layer is connected to the surface of the bottom coating layer in a covering manner through an electric arc spraying process; the priming layer is made of a nickel-based alloy material containing aluminum, and the modification layer is made of a silver-based alloy material containing nickel.
2. The aluminum alloy surface low-temperature brazing modified coating as claimed in claim 1, wherein the thickness of the base layer is 7-12 μm, and the nickel-based alloy material comprises 0.5-20% by mass of aluminum.
3. The aluminum alloy surface low-temperature brazing modified coating as claimed in claim 1, wherein the thickness of the modified layer is 25-35 μm, and the silver-based alloy material contains 2-15% by mass of nickel.
4. A method for preparing a low temperature brazing modified coating for an aluminum alloy surface according to any one of claims 1 to 3, comprising the steps of:
s01, surface purification, namely cleaning the surface of the aluminum alloy substrate;
s02, roughening the surface, namely roughening the aluminum alloy substrate;
s03, preheating, namely preheating the back of the aluminum alloy substrate to be sprayed;
s04, preparing a priming layer, namely covering a nickel alloy material containing aluminum on the surface of an aluminum alloy substrate to form the priming layer;
and S05, preparing a modified layer, namely covering the silver-based alloy material containing nickel on the priming layer to form the modified layer.
5. The method for preparing the aluminum alloy surface low-temperature brazing modified coating according to the claim 4, wherein in the step S01, absolute ethyl alcohol is adopted to clean the surface of the aluminum alloy substrate, and the surface is kept clean after the absolute ethyl alcohol is dried.
6. The method for preparing the modified coating for low-temperature brazing on the surface of the aluminum alloy as claimed in claim 4, wherein in the step S02, the aluminum alloy substrate is roughened by a sand blasting process.
7. The method for preparing the aluminum alloy surface low-temperature brazing modified coating according to claim 4, wherein the preheating temperature in the step S03 is 50-100 ℃.
8. The method for preparing the aluminum alloy surface low-temperature brazing modified coating according to claim 4, wherein a nickel-based alloy spraying wire is used in the step S04, a priming layer is sprayed on the surface of the aluminum alloy substrate by adopting an electric arc spraying process, and the nickel-based alloy spraying wire contains 0.5-20% of Al by mass and has a diameter of 2-3mm.
9. The method for preparing the modified coating for the low-temperature brazing of the aluminum alloy surface according to claim 4, wherein a silver-based alloy spraying wire is used in the step S05, the modified layer is sprayed on the priming layer by adopting an electric arc spraying process, and the silver-based alloy spraying wire comprises 2-15% of Ni and 0.5-5% of Cu in percentage by mass.
10. The method for preparing the aluminum alloy surface low-temperature brazing modified coating according to claim 8 or 9, wherein an electric arc spraying machine is used for spraying, the spraying voltage is 25-35V, the spraying current is 150-250A, the spraying gas pressure is 0.2-0.6MPa, the spraying gun distance is 60-200mm, the spraying gun speed is 400-500mm/s, and the used protective gas is one of argon and nitrogen.
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| CN115283664A (en) * | 2022-07-13 | 2022-11-04 | 哈尔滨工业大学（深圳） | Cu-Al 2 O 3 Cold spraying composite powder and preparation method and application thereof |
| CN115319416A (en) * | 2022-08-19 | 2022-11-11 | 中国电子科技集团公司第三十八研究所 | High-efficiency millimeter wave multilayer antenna low-temperature brazing method |
| CN117586042A (en) * | 2024-01-19 | 2024-02-23 | 成都飞机工业（集团）有限责任公司 | Connection method of ceramic matrix composite |
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