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Introduction of brazed aluminum honeycomb panel
Brazed aluminum honeycomb panel is an aluminum honeycomb sandwich structure material that combines aluminum panel and aluminum honeycomb core through brazing process. The material is made by combining the aluminum honeycomb core and the aluminum panel, placing it in a brazing furnace, and brazing and welding it in one time in a temperature field of about 600°C. All nodes between the aluminum honeycomb core and the aluminum honeycomb core, and between the aluminum honeycomb core and the panel are metal connections, and no non-metallic materials such as adhesives are added in the middle. The aluminum honeycomb core is a welded aluminum honeycomb with a certain thickness and width, formed by corrugation method, and arranged together to form a regular hexagon. The heating temperature of the brazed aluminum honeycomb panel in the brazing furnace is higher than the melting temperature of the solder and lower than the melting temperature of the base metal, that is, the solder melts but the base metal does not melt. The two base metals are welded together after dissolving, diffusing, cooling and solidifying with the base metal. This greatly changes the properties of brazed aluminum honeycomb panels, forming an independent new light metal structural composite material.
Advantages of brazed aluminum honeycomb panel
- Lightweight
Because the aluminum honeycomb core of brazed aluminum honeycomb panel is composed of regular hexagonal porous structure formed by corrugated aluminum strip with a certain width and thickness, the solid cross-sectional area is small, so the density of brazed aluminum honeycomb panel is much lower than that of the material itself. (The thickness of the brazed aluminum honeycomb panel is 22 mm, the aluminum panels are 1.0 mm and 1.2 mm, the thickness of the aluminum honeycomb core is 19.8 mm, and the areal density is 8.7 kg/m2).
- High node strength
The nodes in the brazed aluminum honeycomb panel are connected together by brazing welding. The base metal does not melt during the brazing process, which avoids grain growth and corrosion during the welding process. According to GB/T1457— 2005 Test method for roller peel strength of sandwich structure, the roller peel strength of brazed honeycomb panels is generally greater than 200N·mm/mm, and the honeycomb core is in a torn state. The peel strength of the same specification of the aluminum honeycomb panel is generally 80N·mm/mm. The aluminum panel and the honeycomb core are peeled off in the adhesive layer, and the peel strength depends on the strength of the adhesive.
- High compressive strength
The aluminum honeycomb core in the brazed honeycomb panel can choose a thicker aluminum strip to increase the welding area, and because of the high strength of the brazed joints, the stability of the regular hexagonal aluminum honeycomb core structure is strong, even if the overload compression deformation can still maintain a certain amount. According to GB/T1453-2005 sandwich structure or core flat compression performance test method, the flat compression strength of the test is 5.4 MPa, while the flat compression strength of the same specification of the glued aluminum honeycomb panel is 4.2 MPa.
- High tensile strength
The aluminum honeycomb core in the brazed honeycomb panel can choose a thicker aluminum strip to increase the welding area, and because of the high strength of the brazed joints, the stability of the regular hexagonal aluminum honeycomb core structure is strong. According to GB/T1452-2005 sandwich structure or Core flat tensile performance test method, the tensile strength of the test is 6 MPa, the brazed aluminum honeycomb panel is pulled from the aluminum honeycomb core, and the flat compressive strength of the same specification of the glued aluminum honeycomb panel is 2.6 MPa, and the adhesive aluminum honeycomb panel The aluminum faceplate and aluminum honeycomb core are pulled apart from the adhesive layer.
- Excellent impact resistance
When the brazed aluminum honeycomb panel is impacted by external force, because the brazed aluminum honeycomb panel is a 3-layer sandwich structure, the strength of the aluminum honeycomb core is less than that of the panel, and the aluminum honeycomb core is a hexagonal porous structure with a certain height. When the brazed aluminum honeycomb panel is impacted on one side, the aluminum honeycomb core in the middle layer plays the role of decomposing and absorbing the impact energy. On the other hand, the solid material has no buffering action when it is impacted by external force, and directly transmits the impact energy. In March 2015, when the EMU equipment bilge cover was developed, (the main function of the equipment bilge cover is to protect the equipment installed on the bottom of the vehicle to prevent stones, The damage to the equipment is caused by the breakdown of the sand and gravel), the workpieces of brazed aluminum honeycomb panels, aluminum profiles, and carbon fiber are used for 500 g cement balls, and the 90° angle impact test at a speed of 350 km/h is used. The aluminum profile and carbon fiber the samples of the material were broken down by the cement balls, and only the workpieces of the brazed aluminum honeycomb material were not broken down. The test proved that the brazed aluminum honeycomb panels had the best performance and fully met the design requirements.
- Strong temperature resistance
Brazed aluminum honeycomb panels are pure aluminum alloy materials, and the product forming process temperature is as high as 600 °C. Therefore, the temperature resistance of the material depends on the temperature resistance of the aluminum alloy material. In accordance with the general requirements of EN1363-1:2012 fire resistance test, the fire resistance test was carried out. The temperature of the brazed aluminum honeycomb panel with a thickness of 50 mm was heated to 600°C on one side and kept for 20 minutes. The temperature of the outer surface was 360°C. The brazed aluminum honeycomb heated side The surface is slightly deformed, and the deformation amount is 2 mm; there is no visible damage to the appearance, and the temperature resistance is excellent. The temperature resistance of the adhesive aluminum honeycomb panels of the same specification depends on the temperature resistance of the adhesive, generally not exceeding 200 °C.
- Good sound insulation
The sound insulation effect of brazed aluminum honeycomb panels is generally greater than 26 dB according to GB/T19889.3-2005 air sound insulation, and can also reach 33 dB by changing the internal structure, while the sound insulation effect of bonded aluminum honeycomb panels of the same specification is 24 dB. ~26dB.
- Good craftsmanship
Brazed aluminum honeycomb panel is a kind of pure metal material. It is a new type of metal structural material that is welded into one body by brazing. The strength of the nodes is higher than that of the aluminum honeycomb core material.
- Environmentally friendly and recyclable
Brazed aluminum honeycomb panel is a pure metal material, without any non-metallic additives, non-toxic and non-toxic, environmentally friendly green materials.
