Diffusion bonding agent for brazing of aluminum alloy honeycomb plate and diffusion brazing method

Abstract

The invention relates to a diffusion bonding agent for brazing of an aluminum alloy honeycomb plate and a diffusion brazing method. The diffusion bonding agent comprises the following components of, by mass, 80%-90% of Ga-In eutectic liquid alloy and 10%-20% of Si powder. The diffusion brazing method comprises the steps of coating the diffusion bonding agent on the to-be-welded surface of a honeycomb core strip and the to-be-welded surfaces of an upper panel and a lower panel, and placing the honeycomb core strip, the upper panel and the lower panel in a mesh belt type continuous brazing furnace for heating after assembling to obtain the aluminum alloy honeycomb plate. By means of the active bonding agent, high-reliability, high-compactness, brazing-filler-free and brazing-flux-free connection between the aluminum alloy honeycomb plates can be achieved.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy honeycomb plate brazing, in particular to a diffusion bonding agent for aluminum alloy honeycomb plate brazing and a diffusion brazing method. Background technique [0002] Aluminum honeycomb panels have the characteristics of low density, high rigidity, good stability, and good sound and heat insulation properties, and are widely used in aerospace, transportation, and architectural decoration. The traditional aluminum honeycomb structure generally adopts the organic colloid bonding process, and the joints can only form a physical bond, so that the performance of the aluminum honeycomb structure is generally restricted by the adhesive, and its application field, working environment and service life are also limited; while the aluminum alloy honeycomb panel Brazing can form a metallurgical bond at the joint, with small deformation and high precision, and the performance of the joint is also ...

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Problems solved by technology

But the self-flux has the following problems: (1) The self-flux material contains ZnCL 2 and SnCL 2 These two strong corrosive components, the material does not have non-corrosive properties; (2) The self-flux material relies on mass transfer with Al at high temperature to precipitate a small amount of Zn, Sn, Ge, etc. to form eutectic Zn-Al solder , to realize the brazing connection of aluminum alloy, the temperature of the connection process is high, and the welding needs to be realized at 570 °C; (3) there is Sn in the connection process, and Sn is easy to cause intergranular corrosion of the solder joints, and reduce the strength of the joint

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