CN111151913A - Brazing paste, preparation method thereof and preparation method of aluminum alloy honeycomb plate - Google Patents
Brazing paste, preparation method thereof and preparation method of aluminum alloy honeycomb plate Download PDFInfo
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- CN111151913A CN111151913A CN202010073797.3A CN202010073797A CN111151913A CN 111151913 A CN111151913 A CN 111151913A CN 202010073797 A CN202010073797 A CN 202010073797A CN 111151913 A CN111151913 A CN 111151913A
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- brazing
- aluminum alloy
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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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/28—Selection of soldering or welding materials proper with the principal constituent melting at less than 950 degrees C
- B23K35/286—Al as the principal constituent
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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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/40—Making wire or rods for soldering or welding
Abstract
The invention relates to the technical field of aluminum alloy honeycomb plate preparation, in particular to a brazing paste and a preparation method thereof and a preparation method of an aluminum alloy honeycomb plate. The brazing paste mainly comprises aluminum-based brazing filler metal, brazing flux, an organic solvent and a binder; the aluminum-based brazing filler metal comprises, by mass, 10% -13% of silicon, 0.1% -3% of copper and 84% -89.9% of aluminum; the flux comprises potassium fluoroaluminate and/or cesium fluoroaluminate; the mass ratio of the aluminum-based brazing filler metal to the brazing flux is 3: (1-5); the mass ratio of the organic solvent to the binder is (25-52): (5-28); the mass ratio of the sum of the aluminum-based brazing filler metal and the brazing flux to the sum of the organic solvent and the binder is (2-15): 1. the brazing paste obtained by the aluminum-based brazing filler metal, the brazing flux, the organic solvent and the binder in a specific ratio is used for preparing the aluminum alloy honeycomb plate, so that the strength of the aluminum alloy honeycomb plate can be further improved, and the aluminum alloy honeycomb plate is beneficial to popularization.
Description
Technical Field
The invention relates to the technical field of aluminum alloy honeycomb plate preparation, in particular to a brazing paste and a preparation method thereof and a preparation method of an aluminum alloy honeycomb plate.
Background
With the enhancement of energy crisis and environmental awareness, the optimization of material performance and weight is always sought in the industrial fields of aerospace, ships, high-speed trains, rail transit and the like. By using the structural concept of "sandwich", high performance and light weight materials can be obtained. The aluminum alloy honeycomb plate is the structural material, the structure of the aluminum alloy honeycomb plate is an aluminum honeycomb core sandwich structure between an upper aluminum alloy panel and a lower aluminum alloy panel and the panels, and the aluminum alloy honeycomb plate is a novel light-weight structural metal material manufactured by adopting a special method.
In recent years, urban rail transit in China is rapidly developed, and the application requirements of aluminum honeycomb panels on parts such as rail transit car bodies, floors and built-in wallboards are increased rapidly. At present, the aluminum honeycomb panel for the vehicle body is generally manufactured by an adhesive method, the strength and the service life of the aluminum honeycomb panel manufactured by the method are restricted by the performance of the adhesive, and the reliability of the honeycomb panel is rapidly reduced due to the fact that the adhesive is easy to age and fall off under extreme working environments such as too high humidity, too sharp vibration, too high or too low temperature and the like, and great potential safety hazards exist.
At present, the brazing aluminum honeycomb plate is mainly brazed in a composite plate mode, namely brazing filler metals are compounded on two sides or one side of an aluminum alloy, such as a 3003 surface compounded 4343 aluminum alloy and the like, the aluminum alloy has low strength after being welded, heat treatment strengthening cannot be performed, and the brazing aluminum honeycomb plate can only be used in the fields such as floors and the like which have low requirements on strength, so that the further popularization and application of the aluminum alloy honeycomb plate are influenced. Although the strength of the 6xxx aluminum alloy can be improved by heat treatment, the 6xxx aluminum alloy composite plate as the honeycomb core material has high processing difficulty and high cost.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
According to one aspect of the invention, the invention relates to a solder paste consisting essentially of an aluminum-based solder, a flux, an organic solvent and a binder;
the aluminum-based brazing filler metal comprises, by mass, 10% -13% of silicon, 0.1% -3% of copper and 84% -89.9% of aluminum;
the flux comprises potassium fluoroaluminate and/or cesium fluoroaluminate;
the mass ratio of the aluminum-based brazing filler metal to the brazing flux is 3: (1-5);
the mass ratio of the organic solvent to the binder is (25-52): (5-28);
the mass ratio of the sum of the aluminum-based brazing filler metal and the brazing flux to the sum of the organic solvent and the binder is (2-15): 1.
the brazing paste obtained by the aluminum-based brazing filler metal, the brazing flux, the organic solvent and the binder in a specific ratio can be well matched with the 6xxx series aluminum alloy, so that the obtained aluminum alloy honeycomb plate is ensured to have excellent strength.
According to another aspect of the invention, the invention also relates to a preparation method of the brazing paste, which comprises the following steps:
the components are mixed to obtain the soldering paste.
The solder paste with excellent performance can be obtained by mixing the components, and the operation is simple and the cost is low.
According to another aspect of the invention, the invention also relates to a preparation method of the aluminum alloy honeycomb plate, which comprises the following steps:
stretching a honeycomb core plate block obtained by superposing a plurality of aluminum alloy foil strips to obtain a honeycomb core, and assembling and brazing the honeycomb core and an aluminum alloy cover plate;
coating the brazing paste on any aluminum alloy foil strip at equal intervals to form brazing areas with equal width, wherein the width of the brazing areas is 1/3 of the width of the interval blank areas; and after the overlapping, the brazing area on each aluminum alloy foil strip corresponds to the central position of the blank area of the adjacent aluminum alloy foil strip.
The method adopts the specific soldering paste to braze the aluminum alloy honeycomb plate, has low cost and simple operation, and obtains the high-strength brazed aluminum alloy honeycomb plate.
Compared with the prior art, the invention has the beneficial effects that:
(1) the brazing paste obtained by the aluminum-based brazing filler metal, the brazing flux, the organic solvent and the binder in a specific ratio can be well matched with the 6xxx series aluminum alloy, so that the obtained aluminum alloy honeycomb plate is ensured to have excellent strength and long service life.
(2) The preparation method of the soldering paste is simple, the soldering paste with excellent performance can be obtained by mixing the components, and the cost is low.
(3) The invention adopts the specific soldering paste to be matched with the raw material of the aluminum alloy honeycomb plate to prepare the honeycomb core, assembles and brazes the honeycomb core and the aluminum alloy cover plate sprayed with the specific soldering flux, has low cost and simple operation, can obtain the high-strength brazed aluminum alloy honeycomb plate through the heat treatment process after welding, and has wider application range.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a drawing of a honeycomb core made in accordance with the present invention;
FIG. 2 is a schematic view showing the positional relationship of aluminum alloy foil strips coated with a solder paste according to the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products commercially available.
According to one aspect of the invention, the invention relates to a brazing paste for brazing an aluminum alloy honeycomb plate, which mainly comprises a brazing filler metal, a brazing flux, an organic solvent and a binder, wherein the brazing filler metal is an alloy of silicon, copper and aluminum, and the mass percent of the brazing filler metal is 10-13%, the mass percent of the copper is 0.1-3%, and the mass percent of the aluminum is 84-89.9%;
the flux comprises potassium fluoroaluminate and/or cesium fluoroaluminate;
the mass ratio of the aluminum-based brazing filler metal to the brazing flux is 3: (1-5);
the mass ratio of the organic solvent to the binder is (25-52): (5-28);
the mass ratio of the sum of the aluminum-based brazing filler metal and the brazing flux to the sum of the organic solvent and the binder is (2-15): 1.
according to the invention, through the matching action of the aluminum-based brazing filler metal, the brazing flux, the organic solvent and the adhesive in a specific ratio, the brazing flux with excellent welding performance is obtained, and can be well matched with 6xxx series aluminum alloy, so that the obtained aluminum alloy honeycomb plate is ensured to have excellent strength and long service life.
The aluminum-based brazing filler metal is a powdered brazing filler metal obtained by atomizing an alloy prepared from 10-13% of silicon, 0.1-3% of copper and 84-89.9% of aluminum. In the preparation process, the performance of the obtained powder brazing filler metal is controlled by controlling the component proportion of the molten liquid, the pressure, the temperature, the melt flow and the like of the atomizing airflow.
The invention adopts potassium fluoroaluminate and cesium fluoroaluminate as the brazing flux and has the following functions: (1) oxides on the surfaces of the base metal and the brazing filler metal can be removed, and necessary conditions are created for spreading and filling the joints on the base metal by the liquid brazing filler metal; (2) the air is isolated, so that the oxidation can be prevented; (3) the wetting ability of the liquid solder to the surface of the base metal can be improved.
In one embodiment, the mass ratio of the aluminum-based brazing filler metal and the flux is 3: (1-5); alternatively 3:1.2, 3:1.5, 3:1.7, 3:2, 3:2.2, 3:2.5, 3:2.73:3, 3:3.2, 3:3.5, 3:3.7, 3:4, 3, 4.2, 3:4.5, 3:4.7 or 3: 4.9.
In one embodiment, the mass ratio of the organic solvent to the binder is (25-52): (5-28), and can also select 25:7, 25:10, 25:20, 30:13, 30:22, 35:7, 40:25, 40:28, 45:8, 45:18 or 50: 27.
In one embodiment, the mass ratio of the sum of the aluminum-based brazing filler metal and the brazing flux to the sum of the organic solvent and the binder is (2-15): 1, 2:1, 3:1. 4:1, 5:1, 5.5:1, 10:1, 11:1, 12:1, 13:1, 14: or 15: 1.
Preferably, the organic solvent includes at least one of trichloroethylene, dipropylene glycol monomethyl ether, and diethylene glycol monomethyl ether.
Preferably, the binder comprises a polystyrene resin.
Preferably, the granularity of the aluminum-based brazing filler metal is 180-270 meshes;
preferably, the granularity of the aluminum-based brazing filler metal is 200-250 meshes.
In one embodiment, the particle size range of the aluminum-based brazing filler metal is 180-270 meshes, and any one of the particle size ranges of 180 meshes, 200 meshes, 250 meshes and 270 meshes can be selected.
Preferably, the brazing flux comprises potassium fluoroaluminate and cesium fluoroaluminate, and the mass ratio of the potassium fluoroaluminate to the cesium fluoroaluminate is 1 (1.4-1.6).
The invention can better play a role in removing the film and prevent the oxidation and activation of the parent metal by the brazing flux with a specific proportion.
In one embodiment, the mass ratio of the potassium fluoroaluminate to the cesium fluoroaluminate is 1 (1.4 to 1.6), and may further be selected from 1:1.41, 1:1.42, 1:1.43, 1:1.44, 1:1.45, 1:1.46, 1:1.47, 1:1.48, 1:1.49, 1:1.50, 1:1.51, 1:1.52, 1:1.53, 1:1.54, 1:55, 1:1.56, 1:1.57, 1:1.58, or 1: 1.59.
Preferably, the granularity of the brazing flux is 200-325 meshes;
preferably, the granularity of the brazing flux is 250-270 meshes.
In one embodiment, the particle size range of the brazing flux is 200-325 meshes, and any one of the particle size ranges of 250 meshes, 270 meshes or 325 meshes can be selected.
According to another aspect of the invention, the invention also relates to a preparation method of the brazing paste for brazing the aluminum alloy honeycomb plate, which comprises the following steps:
and mixing the components to obtain the brazing paste for brazing the aluminum alloy honeycomb plate.
The preparation method of the soldering paste is simple and easy to implement, and can be obtained by mixing the components.
In one embodiment, the aluminum-based brazing filler metal and the brazing flux are mixed uniformly, the organic solvent and the binder are prepared according to the proportion, and then the mixed powder of the aluminum-based brazing filler metal and the brazing flux, the organic solvent and the binder are mixed and stirred uniformly.
After the soldering paste is solidified, an organic solvent can be added for dissolving and continuously using. The degree of thinning of the solder paste can be adjusted by the amount of the added organic solvent.
According to another aspect of the invention, the invention also relates to a preparation method of the aluminum alloy honeycomb plate, which comprises the following steps:
stretching a honeycomb core plate block obtained by superposing a plurality of aluminum alloy foil strips to obtain a honeycomb core, and assembling and brazing the honeycomb core and an aluminum alloy cover plate;
coating the brazing paste on any aluminum alloy foil strip at equal intervals to form brazing areas with equal width, wherein the width of the brazing areas is 1/3 of the width of the interval blank areas; and after the overlapping, the brazing area on each aluminum alloy foil strip corresponds to the central position of the blank area of the adjacent aluminum alloy foil strip.
The invention adopts the specific soldering paste to be matched with the aluminum alloy honeycomb plate for soldering, has low cost and simple operation, can obtain the high-strength soldered aluminum alloy honeycomb plate through the heat treatment process after soldering, and has wider application range.
The brazing honeycomb plate realizes permanent chemical metallurgical bonding between the honeycomb core body and the panel by utilizing the molten metal brazing filler metal, the mechanical property of the brazing honeycomb plate after the heat treatment strengthening far exceeds that of an adhesive honeycomb plate and the existing brazing honeycomb plate with the same specification, the service performance is not limited by environmental factors and other conditions, and the excellent performance of the honeycomb plate can be exerted to the maximum extent.
The brazing process can adopt the existing gas shielded brazing equipment, does not need to refit the equipment, and is convenient for technical transformation and product promotion of manufacturers.
The honeycomb core prepared by the embodiment of the invention is shown in figure 1.
The schematic diagram of the position relationship of the aluminum alloy foil strips coated with the brazing paste of the present invention is shown in fig. 2, which takes the stacking of 4 aluminum alloy foil strips as an example.
The aluminum alloy foil strips can be stacked from tens of layers to hundreds of layers, for example, 15-500 layers, and also 20 layers, 50 layers, 60 layers, 80 layers, 100 layers, 120 layers, 150 layers, 200 layers, 300 layers, 350 layers, 400 layers, 450 layers or 500 layers can be selected.
Preferably, the thickness of the coating of the soldering paste is 0.1-0.3 mm.
In one embodiment, the thickness of the coating of the solder paste is 0.1-0.3 mm, and may be selected from 0.11mm, 0.13mm, 0.15mm, 0.18mm, 0.19mm, 0.20mm, 0.22mm, 0.25mm, or 0.29 mm.
Preferably, the aluminum alloy foil is 6061 and/or 6063.
6061 aluminum alloy has magnesium and silicon as main alloying elements and forms Mg2Si has excellent processing performance, excellent welding characteristic, electroplating property, excellent corrosion resistance, high toughness, no deformation after processing, compact and flawless material, easy polishing, easy coloring film, excellent oxidation effect and other excellent characteristics.
6063 aluminum alloy is a heat treatable strengthened alloy with moderate strength in the AL-Mg-Si system, Mg and Si are main alloying elements, and has good corrosion resistance, excellent weldability, good cold workability, and moderate strength.
The aluminum alloy honeycomb plate has the advantages that the brazing paste with specific components and proportions is matched with the aluminum alloy foil strip 6061 or 6063, the welding strength is improved through postweld heat treatment strengthening, the strength of the aluminum alloy honeycomb plate is improved, and the application range of the aluminum alloy honeycomb plate is expanded.
Preferably, the thickness of the aluminum alloy foil strip is 0.01-0.03 mm;
preferably, the aluminum alloy foil strip is subjected to ultrasonic cleaning for 30-120 min;
preferably, the method further comprises cutting the honeycomb core block into honeycomb core strips.
In the present invention, the bonded honeycomb core plate block may be cut into honeycomb core strips of a desired size and further stretched into a honeycomb core.
In one embodiment, the aluminum alloy foil strip has a thickness of 0.01 to 0.03mm, and optionally 0.012mm, 0.015mm, 0.017mm, 0.019mm, 0.020mm, 0.021mm, 0.022mm, 0.023mm, 0.024mm, 0.025mm, 0.026mm, 0.027mm, 0.028mm, or 0.029 mm.
In one embodiment, the aluminum alloy foil is ultrasonically cleaned for 30-120min, and optionally 35min, 40min, 45min, 50min, 55min, 60min, 65min, 70min, 75min, 80min, 85min, 90min, 95min, 100min, 105min, 110min, or 115 min.
Preferably, the brazing temperature is 550-610 ℃, and the brazing time is 15-120 min.
In one embodiment, the brazing temperature is 550-610 ℃, and 555 ℃, 560 ℃, 565 ℃, 570 ℃, 575 ℃, 580 ℃, 585 ℃, 590 ℃, 595 ℃, 600 ℃ or 605 ℃ can be selected.
In one embodiment, the brazing time is 15-120 min, and can be 20min, 30min, 40min, 50min, 60min, 70min, 80min, 90min or 110 min.
The brazing time in the present invention refers to the holding time at the brazing temperature.
Preferably, the aluminum alloy cover plate is a composite plate, and the aluminum alloy cover plate is sprayed with a soldering flux with the thickness of 0.25-0.55 mm;
the aluminum alloy cover plate of the invention is a composite plate, such as 6063/4104, 6061/4104 and 6061/4004.
When the aluminum alloy cover plate and the honeycomb core are welded, the aluminum alloy cover plate composite layer 6063 or 6061 is used as brazing filler metal.
More preferably, the flux comprises potassium fluoroaluminate and/or cesium fluoroaluminate;
more preferably, the weight ratio of potassium fluoroaluminate to cesium fluoroaluminate is 1: (1.2-1.5).
In one embodiment, the aluminum alloy cover plate is sprayed with the brazing flux with the thickness of 0.25-0.55 mm, and 0.30mm, 0.35mm, 0.40mm, 0.46mm, 0.47mm, 0.48mm, 0.49mm, 0.5mm, 0.51mm, 0.52mm, 0.53mm or 0.54mm can be selected.
Preferably, the operation of carrying out heat treatment on the aluminum alloy honeycomb plate obtained after brazing is further included;
preferably, the heat treatment comprises solution treatment and aging treatment;
preferably, the temperature of the solution treatment is 500-540 ℃, and the heat preservation time is 10-60 min;
preferably, the temperature of the aging treatment is 180-220 ℃, and the heat preservation time is 8-36 h.
According to the invention, the aluminum alloy honeycomb plate obtained after brazing is subjected to solution treatment and aging treatment under specific conditions, so that the strength of the aluminum alloy honeycomb plate is improved and the service life of the aluminum alloy honeycomb plate is prolonged.
In one embodiment, the method for preparing the aluminum alloy honeycomb panel comprises the following steps:
ultrasonically cleaning 6061 or 6063 aluminum alloy foil strips with the thickness of 0.01-0.03mm for 30-120min, airing, and overlapping a plurality of aluminum alloy foil strips together, wherein the soldering paste is coated on any one aluminum alloy foil strip at equal intervals to form soldering areas with equal width, and the width of each soldering area is 1/3 of the width of the interval blank area; after superposition, the brazing area on each aluminum alloy foil strip corresponds to the central position of the blank area of the adjacent aluminum alloy foil strip, the thickness of the coating is 0.15-0.3 mm, the aluminum alloy foil strips are mutually bonded together (dozens or hundreds of layers) by the method to form a honeycomb core plate, after the binder in the brazing paste is fully cured, the honeycomb core plate is placed on a cutting machine to be cut into required honeycomb core strips, the honeycomb core strips are stretched and unfolded into honeycomb cores by stretching, then the aluminum alloy cover plate sprayed with the brazing flux is assembled with the honeycomb cores to be brazed in a gas protection manner, the aluminum alloy cover plate is a composite plate, and the thickness of the brazing flux sprayed on the aluminum alloy cover plate is 0.25-0.55 mm; the brazing flux comprises potassium fluoroaluminate and/or cesium fluoroaluminate, and the weight ratio of the potassium fluoroaluminate to the cesium fluoroaluminate is 1: (1.2-1.5), wherein the brazing temperature is 550-610 ℃, and the brazing time is 15-120 min; and carrying out solid solution treatment and aging treatment on the aluminum alloy honeycomb plate obtained after brazing, wherein the temperature of the solid solution treatment is 500-540 ℃, the heat preservation time is 10-60 min, the temperature of the aging treatment is 180-220 ℃, and the heat preservation time is 8-36 h.
The present invention will be further explained with reference to specific examples and comparative examples.
Example 1
A kind of soldering paste, mainly include aluminium base brazing filler metal, soldering flux, organic solvent and agglomerant;
the aluminum-based brazing filler metal comprises, by mass, 11% of silicon, 0.5% of copper and 88.5% of aluminum;
the brazing flux is potassium fluoroaluminate and cesium fluoroaluminate; the organic solvent is trichloroethylene, and the binder is polystyrene resin;
the mass ratio of the aluminum-based brazing filler metal to the brazing flux is 3: 2;
the mass ratio of the organic solvent to the binder is 25: 17;
the mass ratio of the sum of the aluminum-based brazing filler metal and the brazing flux to the sum of the organic solvent and the binder is 15: 1;
the preparation method of the soldering paste comprises the following steps:
the aluminum-based brazing filler metal and the brazing flux are mixed and stirred uniformly according to the proportion, the trichloroethylene and the polystyrene resin are mixed and stirred uniformly according to the proportion, and the mixed powder of the aluminum-based brazing filler metal and the brazing flux and the mixture of the trichloroethylene and the polystyrene resin are mixed and stirred uniformly.
A preparation method of an aluminum alloy honeycomb plate comprises the following steps:
ultrasonically cleaning 6063 aluminum alloy foil strips (100 multiplied by 100mm) with the thickness of 0.02mm for 30min, airing, and overlapping a plurality of aluminum alloy foil strips, wherein the soldering paste is coated on any one aluminum alloy foil strip at equal intervals to form soldering areas with equal width, and the width of each soldering area is 1/3 of the width of the interval blank area; after superposition, the brazing area on each aluminum alloy foil strip corresponds to the central position of the blank area of the adjacent aluminum alloy foil strip, the thickness of the coating is 0.2mm, the aluminum alloy foil strips are mutually bonded together by the method to form a honeycomb core plate, after the binder in the brazing paste is fully cured, the honeycomb core plate is placed on a cutting machine to be cut into honeycomb core strips with the thickness of 100 multiplied by 10mm, the honeycomb core strips are unfolded into honeycomb cores by stretching, as shown in figure 1, then an aluminum alloy cover plate sprayed with a brazing flux is assembled with the honeycomb cores to carry out gas protection brazing, the aluminum alloy cover plate is an 6063/4104 composite plate, the thickness of the aluminum alloy cover plate sprayed with the brazing flux is 0.5mm, the brazing flux comprises potassium fluoroaluminate and cesium fluoroaluminate, the weight ratio of the potassium fluoroaluminate to the cesium fluoroaluminate is 2:3, the brazing temperature is 605 ℃, the brazing time is 30min, and the aluminum alloy honeycomb plates obtained after brazing are subjected to solution treatment and aging treatment, the temperature of the solid solution treatment is 500 ℃, the heat preservation time is 60min, the temperature of the aging treatment is 180 ℃, and the heat preservation time is 8 h.
Example 2
A kind of soldering paste, mainly include aluminium base brazing filler metal, soldering flux, organic solvent and agglomerant;
the aluminum-based brazing filler metal comprises, by mass, 10% of silicon, 3% of copper and 87% of aluminum;
the brazing flux is potassium fluoroaluminate and cesium fluoroaluminate; the organic solvent is dipropylene glycol monomethyl ether, and the binder is polystyrene resin;
the mass ratio of the aluminum-based brazing filler metal to the brazing flux is 3: 1;
the mass ratio of the organic solvent to the binder is 52: 27;
the mass ratio of the sum of the aluminum-based brazing filler metal and the brazing flux to the sum of the organic solvent and the binder is 5: 1;
the preparation method of the soldering paste comprises the following steps:
the aluminum-based brazing filler metal and the brazing flux are mixed and stirred uniformly according to the proportion, the dipropylene glycol monomethyl ether and the polystyrene resin are mixed and stirred uniformly according to the proportion, and the mixed powder of the aluminum-based brazing filler metal and the brazing flux and the mixture of the dipropylene glycol monomethyl ether and the polystyrene resin are mixed and stirred uniformly.
A preparation method of an aluminum alloy honeycomb plate comprises the following steps:
ultrasonically cleaning 6063 aluminum alloy foil strips (100 multiplied by 100mm) with the thickness of 0.02mm for 120min, airing, and overlapping a plurality of aluminum alloy foil strips, wherein any aluminum alloy foil strip is coated with the brazing paste at equal intervals to form brazing areas with equal width, and the width of each brazing area is 1/3 of the width of the interval blank area; the brazing area on each aluminum alloy foil strip after superposition corresponds to the central position of the blank area of the aluminum alloy foil strip adjacent to the brazing area, the thickness of the coating is 0.45mm, the aluminum alloy foil strips are mutually bonded together by the method to form a honeycomb core plate, after a bonding agent in brazing paste is fully cured, the honeycomb core plate is placed on a cutting machine to be cut into honeycomb core strips with the thickness of 100 x 15mm, the honeycomb core strips are unfolded into honeycomb cores through stretching, then an aluminum alloy cover plate sprayed with a brazing flux is assembled with the honeycomb cores to be subjected to gas protection brazing, the aluminum alloy cover plate is an 6061/4104 composite plate, the thickness of the aluminum alloy cover plate sprayed with the brazing flux is 0.55mm, the brazing flux comprises potassium fluoroaluminate and cesium fluoroaluminate, and the weight ratio of the potassium fluoroaluminate to the cesium fluoroaluminate is 1: 1.2, the brazing temperature is 600 ℃, the brazing time is 35min, the aluminum alloy honeycomb plate obtained after brazing is subjected to solution treatment and aging treatment, the solution treatment temperature is 540 ℃, the heat preservation time is 10min, the aging treatment temperature is 1220 ℃, and the heat preservation time is 15 h.
Example 3
A kind of soldering paste, mainly include aluminium base brazing filler metal, soldering flux, organic solvent and agglomerant;
the aluminum-based brazing filler metal comprises 13% of silicon, 1% of copper and 86% of aluminum by mass percent;
the flux comprises potassium fluoroaluminate and cesium fluoroaluminate; the organic solvent is trichloroethylene, and the binder is polystyrene resin;
the mass ratio of the aluminum-based brazing filler metal to the brazing flux is 3: 5;
the mass ratio of the organic solvent to the binder is 40: 11;
the mass ratio of the sum of the aluminum-based brazing filler metal and the brazing flux to the sum of the organic solvent and the binder is 10: 1.
the preparation method of the soldering paste comprises the following steps:
the aluminum-based brazing filler metal and the brazing flux are mixed and stirred uniformly according to the proportion, the trichloroethylene and the polystyrene resin are mixed and stirred uniformly according to the proportion, and the mixed powder of the aluminum-based brazing filler metal and the brazing flux and the mixture of the trichloroethylene and the polystyrene resin are mixed and stirred uniformly.
A preparation method of an aluminum alloy honeycomb plate comprises the following steps:
ultrasonically cleaning a 6061 aluminum alloy foil strip (300 multiplied by 100mm) with the thickness of 0.03mm for 50min, airing, and overlapping a plurality of aluminum alloy foil strips, wherein the soldering paste is coated on any one aluminum alloy foil strip at equal intervals to form soldering areas with equal width, and the width of each soldering area is 1/3 of the width of the interval blank area; the brazing area on each aluminum alloy foil strip after superposition corresponds to the central position of the blank area of the aluminum alloy foil strip adjacent to the brazing area, the thickness of the coating is 0.3mm, the aluminum alloy foil strips are mutually bonded together by the method to form a honeycomb core plate, after a bonding agent in brazing paste is fully cured, the honeycomb core plate is cut into honeycomb core strips with the size of 300 multiplied by 10mm on a cutting machine, the honeycomb core strips are unfolded into honeycomb cores by stretching, then an aluminum alloy cover plate sprayed with a brazing flux is assembled with the honeycomb cores to carry out gas protection brazing, the aluminum alloy cover plate is an 6061/4004 composite plate, the thickness of the aluminum alloy cover plate sprayed with the brazing flux is 0.45mm, the brazing flux comprises potassium fluoroaluminate and cesium fluoroaluminate, and the weight ratio of the potassium fluoroaluminate to the cesium fluoroaluminate is 1: 1.3, the brazing temperature is 590 ℃, the time is 40min, the aluminum alloy honeycomb plate obtained after brazing is subjected to solution treatment and aging treatment, the solution treatment temperature is 520 ℃, the heat preservation time is 20min, the aging treatment temperature is 200 ℃, and the heat preservation time is 20 h.
Example 4
A kind of soldering paste, mainly include aluminium base brazing filler metal, soldering flux, organic solvent and agglomerant;
the aluminum-based brazing filler metal comprises 12% of silicon, 3% of copper and 85% of aluminum by mass percent;
the flux comprises potassium fluoroaluminate and cesium fluoroaluminate; the organic solvent is diethylene glycol monomethyl ether, and the binder is polystyrene resin;
the mass ratio of the aluminum-based brazing filler metal to the brazing flux is 3: 4;
the mass ratio of the organic solvent to the binder is 35: 28;
the mass ratio of the sum of the aluminum-based brazing filler metal and the brazing flux to the sum of the organic solvent and the binder is 8: 1.
the preparation method of the soldering paste comprises the following steps:
the aluminum-based brazing filler metal and the brazing flux are mixed and stirred uniformly according to the proportion, the diethylene glycol monomethyl ether and the polystyrene resin are mixed and stirred uniformly according to the proportion, and the mixed powder of the aluminum-based brazing filler metal and the brazing flux and the mixture of the diethylene glycol monomethyl ether and the polystyrene resin are mixed and stirred uniformly.
A preparation method of an aluminum alloy honeycomb plate comprises the following steps:
ultrasonically cleaning 6061 aluminum alloy foil strips (400 multiplied by 400mm) with the thickness of 0.03mm for 40min, airing, and overlapping a plurality of aluminum alloy foil strips, wherein any one aluminum alloy foil strip is coated with the brazing paste at equal intervals to form brazing areas with equal width, and the width of each brazing area is 1/3 of the width of the interval blank area; the brazing area of each aluminum alloy foil strip after superposition corresponds to the central position of the blank area of the aluminum alloy foil strip adjacent to the brazing area, the thickness of the coating is 0.25mm, the aluminum alloy foil strips are mutually bonded together by the method to form a honeycomb core plate, after a bonding agent in brazing paste is fully cured, the honeycomb core plate is cut into honeycomb core strips with the thickness of 400 x 20mm on a cutting machine, the honeycomb core strips are unfolded into honeycomb cores by stretching, then the aluminum alloy cover plates sprayed with a brazing flux are assembled with the honeycomb cores to carry out gas protection brazing, the aluminum alloy cover plates are 6061/4004 composite plates, the thickness of the aluminum alloy cover plates sprayed with the brazing flux is 0.49mm, the brazing flux comprises potassium fluoroaluminate and cesium fluoroaluminate, and the weight ratio of the potassium fluoroaluminate to the cesium fluoroaluminate is 1:1.4, the brazing temperature is 585 ℃, the time is 50min, the aluminum alloy honeycomb plate obtained after brazing is subjected to solid solution treatment and aging treatment, the temperature of the solid solution treatment is 510 ℃, the heat preservation time is 30min, the temperature of the aging treatment is 210 ℃, and the heat preservation time is 36 h.
Comparative example 1
An aluminum alloy honeycomb core obtained by bonding the aluminum alloy foil tape of example 4 with a thermosetting adhesive was bonded to the composite sheet of example 4 to obtain a bonded honeycomb sheet.
Comparative example 2
An aluminum alloy honeycomb panel was fabricated in the same manner as in example 4, except that the aluminum alloy foil strip was 3003 and the composite sheet was 3003/4004.
Test examples
The aluminum alloy honeycomb panels prepared in examples 1 to 4 of the present invention and the aluminum alloy honeycomb panels of comparative example 1 and comparative example 2 were subjected to a roller peel strength test, and the results are shown in table 1.
TABLE 1 Drum Peel Strength test results
As can be seen from Table 1, the high-strength honeycomb core is obtained by matching the brazing paste with specific components and proportions with the aluminum alloy honeycomb plate, the high-strength honeycomb plate is obtained by matching the high-strength honeycomb core with the specific aluminum alloy cover plate under specific brazing conditions and after heat treatment, the roller peeling strength of the honeycomb plate reaches more than 197N ∙ mm/mm through detection, the service life is longer, and the application range is wide. Whereas the roll peel strength of the adhesive honeycomb panel of comparative example 1 was 67.1N ∙ mm/mm, and the roll peel strength of the aluminum alloy honeycomb panel of comparative example 2 was 146N ∙ mm/mm, which was inferior in strength.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The brazing paste is characterized by mainly comprising aluminum-based brazing filler metal, brazing flux, organic solvent and binder;
the aluminum-based brazing filler metal comprises, by mass, 10% -13% of silicon, 0.1% -3% of copper and 84% -89.9% of aluminum;
the flux comprises potassium fluoroaluminate and/or cesium fluoroaluminate;
the mass ratio of the aluminum-based brazing filler metal to the brazing flux is 3: (1-5);
the mass ratio of the organic solvent to the binder is (25-52): (5-28);
the mass ratio of the sum of the aluminum-based brazing filler metal and the brazing flux to the sum of the organic solvent and the binder is (2-15): 1.
2. the solder paste of claim 1, wherein the organic solvent comprises at least one of trichloroethylene, dipropylene glycol monomethyl ether, and diethylene glycol monomethyl ether;
preferably, the binder comprises a polystyrene resin;
preferably, the granularity of the aluminum-based brazing filler metal is 180-270 meshes;
preferably, the granularity of the aluminum-based brazing filler metal is 200-250 meshes;
preferably, the brazing flux comprises potassium fluoroaluminate and cesium fluoroaluminate, and the mass ratio of the potassium fluoroaluminate to the cesium fluoroaluminate is 1 (1.4-1.6);
preferably, the granularity of the brazing flux is 200-325 meshes;
preferably, the granularity of the brazing flux is 250-270 meshes.
3. A method of producing a solder paste according to claim 1 or 2, characterized by comprising the steps of:
the components are mixed to obtain the soldering paste.
4. The preparation method of the aluminum alloy honeycomb plate is characterized by comprising the following steps of:
stretching a honeycomb core plate block obtained by superposing a plurality of aluminum alloy foil strips to obtain a honeycomb core, and assembling and brazing the honeycomb core and an aluminum alloy cover plate;
coating the brazing paste of claim 1 or 2 on any aluminum alloy foil strip at equal intervals to form brazing areas with equal width, wherein the width of the brazing areas is 1/3 of the width of the interval blank areas; and after the overlapping, the brazing area on each aluminum alloy foil strip corresponds to the central position of the blank area of the adjacent aluminum alloy foil strip.
5. The method for manufacturing an aluminum alloy honeycomb panel according to claim 4, wherein the thickness of the coating of the brazing paste is 0.1 to 0.3 mm.
6. The method for preparing the aluminum alloy honeycomb plate according to claim 4, wherein the aluminum alloy foil strip is 6061 and/or 6063;
preferably, the thickness of the aluminum alloy foil strip is 0.01-0.03 mm.
7. The method for preparing the aluminum alloy honeycomb panel according to claim 4, wherein the aluminum alloy foil strip is subjected to ultrasonic cleaning for 30-120 min;
preferably, the method further comprises cutting the honeycomb core block into honeycomb core strips.
8. The method for manufacturing an aluminum alloy honeycomb panel according to claim 4, wherein the brazing temperature is 550 to 610 ℃ and the brazing time is 15 to 120 min.
9. The method for preparing the aluminum alloy honeycomb plate according to claim 4, wherein the aluminum alloy cover plate is a composite plate, and the aluminum alloy cover plate is sprayed with a soldering flux with the thickness of 0.25-0.55 mm;
preferably, the flux comprises potassium fluoroaluminate and/or cesium fluoroaluminate;
more preferably, the weight ratio of potassium fluoroaluminate to cesium fluoroaluminate is 1: (1.2-1.5).
10. The method for producing an aluminum alloy honeycomb panel according to claim 4, further comprising an operation of heat-treating the aluminum alloy honeycomb panel obtained after brazing;
preferably, the heat treatment comprises solution treatment and aging treatment;
preferably, the temperature of the solution treatment is 500-540 ℃, and the heat preservation time is 10-60 min;
preferably, the temperature of the aging treatment is 180-220 ℃, and the heat preservation time is 8-36 h.
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