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 at 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.

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 panel is 1.0 mm, 1.2 mm, the thickness of the aluminum honeycomb core is 19.8 mm, and its areal density is 8.7 kg/m2).

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 [4], while the flat compression strength of the same specification of the glued aluminum honeycomb panel is 4.2 MPa.