CN111250899B - Active connecting agent for brazing aluminum alloy honeycomb plate and reaction brazing method - Google Patents
Active connecting agent for brazing aluminum alloy honeycomb plate and reaction brazing method Download PDFInfo
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- CN111250899B CN111250899B CN202010224034.4A CN202010224034A CN111250899B CN 111250899 B CN111250899 B CN 111250899B CN 202010224034 A CN202010224034 A CN 202010224034A CN 111250899 B CN111250899 B CN 111250899B
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- aluminum alloy
- active connecting
- connecting agent
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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
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/362—Selection of compositions of fluxes
-
- 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
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/02—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating by means of a press ; Diffusion bonding
- B23K20/023—Thermo-compression bonding
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Abstract
The invention relates to an active connecting agent for brazing an aluminum alloy honeycomb plate and a reaction brazing method, wherein the active connecting agent comprises the following components in percentage by mass: CsZnF375-85% of powder, 5-10% of absolute ethyl alcohol and 78-20% of liquid metal Ga 5. And coating an active connecting agent on to-be-welded surfaces of the honeycomb core strip and the upper and lower panels, and after assembly, placing the honeycomb core strip and the upper and lower panels at a high temperature for reaction brazing to obtain the aluminum alloy honeycomb plate. The active connecting agent can realize the connection between the aluminum alloy honeycomb plates with high reliability, high compactness, no brazing filler metal and no brazing flux.
Description
Technical Field
The invention relates to the technical field of aluminum alloy honeycomb plate brazing, in particular to an active connecting agent for aluminum alloy honeycomb plate brazing and a reaction brazing method.
Background
The aluminum honeycomb plate has the characteristics of small density, high rigidity and good stability, has good sound and heat insulation performance, and is widely applied to the fields of aerospace, transportation, architectural decoration and the like. The traditional aluminum honeycomb structure generally adopts an organic colloid bonding process, and only physical combination can be formed at joints, so that the performance of the aluminum honeycomb structure is generally limited by an adhesive, and the application field, the working environment, the service life and the like of the aluminum honeycomb structure are also limited; the brazing of the aluminum alloy honeycomb plate can form metallurgical bonding at the joint, the deformation is small, the precision is high, and the performance of the joint is superior to that of an adhesive joint. However, the temperature of the brazing process of the existing aluminum alloy honeycomb plate is close to 600 ℃, the temperature exceeds the overburning temperature of most aluminum alloys, brazing filler metal is corroded on a base metal, the base metal is seriously softened, and the like. Therefore, finding a new method for brazing to prepare the aluminum alloy honeycomb plate is an urgent problem.
Chinese patent self-fluxing agent material suitable for brazing sheet aluminum and aluminum alloy and a preparation method thereof, publication No. CN103659054B discloses a self-fluxing agent material, which does not need to use brazing filler metal additionally and solves the problems of corrosion and solution of base metal of the brazing filler metal team. However, the self-fluxing agent has the following problems: (1) the self-fluxing agent material contains ZnCL2And SnCL2The material has no non-corrosive characteristic; (2) the self-fluxing agent material is characterized in that a small amount of Zn, Sn, Ge and the like are separated out by means of mass transfer with Al at high temperature to form eutectic Zn-Al solder, so that the soldering connection of aluminum alloy is realized, the temperature in the connection process is high, and the soldering is required to be realized at 570 ℃; (3) the connection process has Sn which is easy to cause intergranular corrosion of welding spots and reduces the strength of the joint.
Disclosure of Invention
The invention aims to solve the defects of the technical problems and provides an active connecting agent for brazing an aluminum alloy honeycomb plate and a reaction brazing method. By means of the contact reaction principle, the active connecting agent can realize the connection between the aluminum alloy honeycomb plates with high reliability, high compactness, no brazing filler metal and no brazing flux.
In order to achieve the purpose, the invention adopts the specific scheme that: an active connecting agent for brazing an aluminum alloy honeycomb plate comprises the following components in percentage by mass: CsZnF375-85% of powder, 5-10% of absolute ethyl alcohol and 78-20% of liquid metal Ga 5.
The active connecting agent for brazing the aluminum alloy honeycomb plate is further optimized by the following steps: the CsZnF3The particle size range of the powder is 50-80 μm, and the purity is more than 99%.
The active connecting agent for brazing the aluminum alloy honeycomb plate is further optimized by the following steps: CsZnF3The powder, the absolute ethyl alcohol and the liquid metal Ga are evenly stirred to prepare the paste-shaped active connecting agent.
A reaction brazing method of an aluminum alloy honeycomb plate comprises the following steps: and coating an active connecting agent on to-be-welded surfaces of the honeycomb core strip and the upper and lower panels, and after assembly, placing the honeycomb core strip and the upper and lower panels at a high temperature for reaction brazing to obtain the aluminum alloy honeycomb plate.
As a further optimization of the reaction brazing method of the aluminum alloy honeycomb plate, the method comprises the following steps: the method specifically comprises the following steps:
1) cleaning surfaces to be welded of the honeycomb core bar and the upper and lower aluminum alloy panels, and coating an active connecting agent on the surfaces to be welded;
2) assembling the honeycomb core bar coated with the active connecting agent and the upper and lower aluminum alloy panels into an aluminum alloy honeycomb plate, applying pressure, placing the aluminum alloy honeycomb plate into a box-type resistance furnace, and preserving heat for 20-30min at the temperature of 380-400 ℃;
3) and after the furnace temperature is reduced to 300 ℃, taking out the aluminum alloy honeycomb plate, placing the aluminum alloy honeycomb plate in the air, and naturally cooling to obtain the welded aluminum alloy honeycomb plate.
As a further optimization of the reaction brazing method of the aluminum alloy honeycomb plate, the method comprises the following steps: the coating process in the step (1) is brush coating or spray coating.
As a further optimization of the reaction brazing method of the aluminum alloy honeycomb plate, the method comprises the following steps: the coating thickness of the active connecting agent is 5-10 mu m.
As a further optimization of the reaction brazing method of the aluminum alloy honeycomb plate, the method comprises the following steps: after the aluminum alloy honeycomb plate is assembled, a pressure of 30g/mm2 is applied and placed in a box-type resistance furnace.
The active connecting agent and the reaction brazing method have the following beneficial effects:
firstly, the invention realizes the in-situ synthesis of the soldered joint of the aluminum alloy honeycomb plate, does not need solder and soldering flux, and adopts CsZnF3The powder coating layer is used as a liquid phase generation source and reacts at 380-400 ℃ in a Zn-Al eutectic temperature region: under the heating condition, liquid metal Ga firstly preferentially diffuses in the grain boundary of the surface of the aluminum alloy (intergranular infiltration effect), the reaction spreading effect is utilized to carry out 'reaction stripping', the temperature rises along with the temperature to reach the Zn-Al eutectic temperature, and Zn-Al eutectic solder and Cs are generated by reactionxAlyFzAnd by using reaction waste heat, the Zn-Al eutectic solder liquid phase completely fills the brazing seam gap. During the incubation, CsZnF3Zn element in (1)The elements are diffused into the aluminum alloy base material in a large amount, so that the joint is metallurgically bonded, and a compact brazing seam structure is formed after cooling, so that the shear strength of the joint reaches more than 80% of the strength of the aluminum alloy base material. Metal Ga is used as an active agent. The Ga has slow action with oxygen, and is slowly oxidized to produce a layer of Ga under the heating condition of brazing2O3Film of Ga2O3The film covers the surface of the aluminum alloy, so that the aluminum alloy can be prevented from being further oxidized;
secondly, the welding of the aluminum alloy honeycomb plate is realized at the medium and low temperature (380-;
thirdly, the active connecting agent of the invention has no corrosive component, and belongs to an environment-friendly brazing connecting agent.
Detailed Description
The technical solution of the present invention is further described below with reference to specific embodiments.
Example 1
An active connecting agent for brazing an aluminum alloy honeycomb plate comprises the following components in percentage by mass: CsZnF with purity of 99% and granularity range between 50-80 μm375% of powder, 5% of liquid metal Ga and 20% of absolute ethyl alcohol, and uniformly stirring the three to prepare the paste-shaped active connecting agent.
Example 2
An active connecting agent for brazing an aluminum alloy honeycomb plate comprises the following components in percentage by mass: CsZnF with purity of 99% and granularity range between 50-80 μm378% of powder, 6% of liquid metal Ga, and 16% of absolute ethyl alcohol, and uniformly stirring the three to prepare the paste-shaped active connecting agent.
Example 3
An active connecting agent for brazing an aluminum alloy honeycomb plate comprises the following components in percentage by mass: CsZnF with purity of 99% and granularity range between 50-80 μm380% of powder, 7% of liquid metal Ga and 13% of absolute ethyl alcohol, and uniformly stirring the powder, the liquid metal Ga and the absolute ethyl alcohol to prepare the paste-shaped active connecting agent.
Example 4
An active connecting agent for brazing an aluminum alloy honeycomb plate comprises the following components in percentage by mass: CsZnF with purity of 99% and granularity range between 50-80 μm382% of powder, 8% of liquid metal Ga and 10% of absolute ethyl alcohol, and uniformly stirring the powder, the Ga8% of liquid metal and the absolute ethyl alcohol to prepare the paste-shaped active connecting agent.
Example 5
An active connecting agent for brazing an aluminum alloy honeycomb plate comprises the following components in percentage by mass: CsZnF with purity of 99% and granularity range between 50-80 μm385% of powder, 10% of liquid metal Ga and 5% of absolute ethyl alcohol, and uniformly stirring the powder, the Ga10% of liquid metal and the absolute ethyl alcohol to prepare the pasty active connecting agent.
Example 6
A reaction brazing method of an aluminum alloy honeycomb plate comprises the following steps:
1) taking the raw materials according to the embodiment 1, and uniformly stirring the raw materials, the raw materials and the raw materials to prepare a paste-shaped active connecting agent;
2) cleaning surfaces to be welded of the honeycomb core bar and the upper and lower aluminum alloy panels, and coating an active connecting agent with the thickness of 12 mu m on the surfaces to be welded;
3) assembling the honeycomb core bar pre-coated with the active connecting agent and the upper and lower aluminum alloy panels, fixedly pressing the honeycomb core bar and the upper and lower aluminum alloy panels on a fixture, placing the honeycomb core bar and the upper and lower aluminum alloy panels in a box type resistance furnace, preserving the heat at 380-400 ℃ for 20-30min, melting the paste material, carrying out a chemical combination reaction among the components, releasing a large amount of heat, forming low-melting solder and aluminum soldering flux, and pre-coating solder resist on the contact surface of the fixture and the aluminum alloy;
4) and (3) under the action of the waste heat of the chemical combination reaction, wetting, flowing and filling the low-melting brazing filler metal, finishing metallurgical bonding with the base metal, finishing brazing, and taking the honeycomb plate out of the air for natural cooling after the furnace temperature is reduced to 300 ℃ to obtain the well-connected aluminum honeycomb plate.
Example 7
A reaction brazing method of an aluminum alloy honeycomb plate comprises the following steps:
1) taking the raw materials according to the embodiment 2, and uniformly stirring the raw materials, the raw materials and the raw materials to prepare a paste-shaped active connecting agent;
2) cleaning surfaces to be welded of the honeycomb core bar and the upper and lower aluminum alloy panels, and coating an active connecting agent with the thickness of 10 mu m on the surfaces to be welded;
3) assembling the honeycomb core bar pre-coated with the active connecting agent and the upper and lower aluminum alloy panels, fixedly pressing the honeycomb core bar and the upper and lower aluminum alloy panels on a fixture, placing the honeycomb core bar and the upper and lower aluminum alloy panels in a box type resistance furnace, preserving heat for 30min at the temperature of 400 ℃, melting the pasty material, generating chemical combination reaction among the components, and emitting a large amount of heat to form low-melting solder and aluminum soldering flux, wherein in addition, a solder resist is pre-coated on the contact surface of the fixture and the aluminum alloy;
4) and (3) under the action of the waste heat of the chemical combination reaction, wetting, flowing and filling the low-melting brazing filler metal, finishing metallurgical bonding with the base metal, finishing brazing, and taking the honeycomb plate out of the air for natural cooling after the furnace temperature is reduced to 300 ℃ to obtain the well-connected aluminum honeycomb plate.
Example 8
A reaction brazing method of an aluminum alloy honeycomb plate comprises the following steps:
1) taking the raw materials according to the embodiment 3, and uniformly stirring the raw materials, the raw materials and the raw materials to prepare a paste-shaped active connecting agent;
2) cleaning surfaces to be welded of the honeycomb core bar and the upper and lower aluminum alloy panels, and coating an active connecting agent with the thickness of 8 mu m on the surfaces to be welded;
3) assembling the honeycomb core bar pre-coated with the active connecting agent and the upper and lower aluminum alloy panels, fixedly pressing the honeycomb core bar and the upper and lower aluminum alloy panels on a fixture, placing the honeycomb core bar and the upper and lower aluminum alloy panels in a box type resistance furnace, preserving the heat for 20min at the temperature of 380 ℃, melting the pasty material, generating a chemical combination reaction among the components, and emitting a large amount of heat to form low-melting solder and aluminum soldering flux, wherein in addition, a solder resist is pre-coated on the contact surface of the fixture and the aluminum alloy;
4) and (3) under the action of the waste heat of the chemical combination reaction, wetting, flowing and filling the low-melting brazing filler metal, finishing metallurgical bonding with the base metal, finishing brazing, and taking the honeycomb plate out of the air for natural cooling after the furnace temperature is reduced to 300 ℃ to obtain the well-connected aluminum honeycomb plate.
Example 9
A reaction brazing method of an aluminum alloy honeycomb plate comprises the following steps:
1) taking the raw materials according to the embodiment 4, and uniformly stirring the raw materials, the raw materials and the raw materials to prepare a paste-shaped active connecting agent;
2) cleaning surfaces to be welded of the honeycomb core bar and the upper and lower aluminum alloy panels, and coating an active connecting agent with the thickness of 6 mu m on the surfaces to be welded;
3) assembling the honeycomb core bar pre-coated with the active connecting agent and the upper and lower aluminum alloy panels, fixedly pressing the honeycomb core bar and the upper and lower aluminum alloy panels on a fixture, placing the honeycomb core bar and the upper and lower aluminum alloy panels in a box type resistance furnace, preserving heat for 20min at the temperature of 400 ℃, melting the pasty material, generating chemical combination reaction among the components, and emitting a large amount of heat to form low-melting solder and aluminum soldering flux, wherein in addition, a solder resist is pre-coated on the contact surface of the fixture and the aluminum alloy;
4) and (3) under the action of the waste heat of the chemical combination reaction, wetting, flowing and filling the low-melting brazing filler metal, finishing metallurgical bonding with the base metal, finishing brazing, and taking the honeycomb plate out of the air for natural cooling after the furnace temperature is reduced to 300 ℃ to obtain the well-connected aluminum honeycomb plate.
Example 10
A reaction brazing method of an aluminum alloy honeycomb plate comprises the following steps:
1) taking the raw materials according to the embodiment 5, and uniformly stirring the raw materials, the raw materials and the raw materials to prepare a paste-shaped active connecting agent;
2) cleaning surfaces to be welded of the honeycomb core bar and the upper and lower aluminum alloy panels, and coating an active connecting agent with the thickness of 12 mu m on the surfaces to be welded;
3) assembling the honeycomb core bar pre-coated with the active connecting agent and the upper and lower aluminum alloy panels, fixedly pressing the honeycomb core bar and the upper and lower aluminum alloy panels on a fixture, placing the honeycomb core bar and the upper and lower aluminum alloy panels in a box type resistance furnace, preserving the heat at 380-400 ℃ for 20-30min, melting the paste material, carrying out a chemical combination reaction among the components, releasing a large amount of heat, forming low-melting solder and aluminum soldering flux, and pre-coating solder resist on the contact surface of the fixture and the aluminum alloy;
4) and (3) under the action of the waste heat of the chemical combination reaction, wetting, flowing and filling the low-melting brazing filler metal, finishing metallurgical bonding with the base metal, finishing brazing, and taking the honeycomb plate out of the air for natural cooling after the furnace temperature is reduced to 300 ℃ to obtain the well-connected aluminum honeycomb plate.
Comparative example 1
Similar to example 1, except that no liquid metal Ga was present in the active linker.
Comparative example 2
Similar to example 1, except that CsZnF in the active linker3Replacing the powder with Zn powder。
Comparative example 3
CsF-AlF matched with traditional Zn-Al eutectic solder3Brazing the aluminum alloy honeycomb plate in a brazing flux furnace.
A mother material was 3003 aluminum alloy, butt joints of aluminum alloy test specimens were prepared according to examples 1 to 5 and comparative examples 1 to 3, and tensile strength of the joints was measured according to GB/T11363. The tensile strength test results are shown in the following table:
the foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (6)
1. A reaction brazing method of an aluminum alloy honeycomb plate is characterized by comprising the following steps: the method specifically comprises the following steps:
1) cleaning surfaces to be welded of the honeycomb core bar and the upper and lower aluminum alloy panels, and coating an active connecting agent on the surfaces to be welded;
the active connecting agent comprises the following components in percentage by mass: CsZnF375-85% of powder, 5-10% of absolute ethyl alcohol and 78-20% of liquid metal Ga 5;
2) assembling the honeycomb core bar coated with the active connecting agent and the upper and lower aluminum alloy panels into an aluminum alloy honeycomb plate, applying pressure, placing the aluminum alloy honeycomb plate into a box-type resistance furnace, and preserving heat for 20-30min at the temperature of 380-400 ℃;
3) and after the furnace temperature is reduced to 300 ℃, taking out the aluminum alloy honeycomb plate, placing the aluminum alloy honeycomb plate in the air, and naturally cooling to obtain the welded aluminum alloy honeycomb plate.
2. The reaction brazing method for an aluminum alloy honeycomb panel as recited in claim 1, wherein: the CsZnF3The particle size range of the powder is 50-80 μm, and the purity is more than 99%.
3. The reaction brazing method for an aluminum alloy honeycomb panel as recited in claim 1, wherein: CsZnF3The powder, the absolute ethyl alcohol and the liquid metal Ga are evenly stirred to prepare the paste-shaped active connecting agent.
4. The reaction brazing method for an aluminum alloy honeycomb panel as recited in claim 1, wherein: the coating process in the step 1) is brush coating or spray coating.
5. The reaction brazing method of an aluminum alloy honeycomb panel as recited in claim 1 or 4, wherein: the coating thickness of the active connecting agent is 5-10 mu m.
6. The reaction brazing method of an aluminum alloy honeycomb panel as recited in claim 1 or 4, wherein: 30g/mm is applied after the aluminum alloy cellular board is assembled2Is juxtaposed in a box-type resistance furnace.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1294541A (en) * | 1998-03-25 | 2001-05-09 | 索尔微氟及衍生物有限公司 | Fluxing agent |
| CN101579766A (en) * | 2009-06-08 | 2009-11-18 | 昆明理工大学 | Preparation method of braze welding type metal honeycomb plate |
| CN104822488A (en) * | 2012-10-26 | 2015-08-05 | 株式会社Uacj | Flux composition |
| CN105081619A (en) * | 2015-09-21 | 2015-11-25 | 北京安达泰克科技有限公司 | Braze cream for brushing and preparation technology and use method of braze cream |
| CN106270869A (en) * | 2016-08-30 | 2017-01-04 | 郑州机械研究所 | A kind of copper alloy contact reaction soldering method and activity bridging agent used |
| CN110883395A (en) * | 2019-12-04 | 2020-03-17 | 哈尔滨工业大学 | Brazing method for aluminum alloy with surface activation by means of liquid gallium pre-coating |
-
2020
- 2020-03-26 CN CN202010224034.4A patent/CN111250899B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1294541A (en) * | 1998-03-25 | 2001-05-09 | 索尔微氟及衍生物有限公司 | Fluxing agent |
| CN101579766A (en) * | 2009-06-08 | 2009-11-18 | 昆明理工大学 | Preparation method of braze welding type metal honeycomb plate |
| CN104822488A (en) * | 2012-10-26 | 2015-08-05 | 株式会社Uacj | Flux composition |
| CN105081619A (en) * | 2015-09-21 | 2015-11-25 | 北京安达泰克科技有限公司 | Braze cream for brushing and preparation technology and use method of braze cream |
| CN106270869A (en) * | 2016-08-30 | 2017-01-04 | 郑州机械研究所 | A kind of copper alloy contact reaction soldering method and activity bridging agent used |
| CN110883395A (en) * | 2019-12-04 | 2020-03-17 | 哈尔滨工业大学 | Brazing method for aluminum alloy with surface activation by means of liquid gallium pre-coating |
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