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

A brazing method and diffusion bonding technology, applied in welding equipment, welding medium, welding equipment, etc., can solve the problems of non-corrosive materials, intergranular corrosion of solder joints, and reduced joint strength, and achieve low cost and good quality. Effect of metallurgical bonding and prevention of high temperature oxidation

Active Publication Date: 2021-10-22
ZHENGZHOU RES INST OF MECHANICAL ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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

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Embodiment 1

[0023] A diffusion bonding agent for aluminum alloy honeycomb plate brazing, the mass percentage of each component is: 10% of Si powder with a purity of 99% and a particle size range of 300-400 mesh, and 90% of Ga-In eutectic liquid alloy . Add Si powder into Ga-In eutectic liquid alloy and stir evenly to make a paste-like diffusion bonding agent.

[0024] The preparation method of Ga-In eutectic liquid alloy: prepare Ga and In according to the eutectic composition, slowly add In to Ga in the plastic cup, Ga and In react, and prepare Ga-In eutectic liquid alloy.

Embodiment 2

[0026] A diffusion bonding agent for aluminum alloy honeycomb plate brazing, the mass percentage of each component is: 12% of Si powder with a purity of 99% and a particle size range of 300-400 mesh, and 88% of Ga-In eutectic liquid alloy . Add Si powder into Ga-In eutectic liquid alloy and stir evenly to make a paste-like diffusion bonding agent.

Embodiment 3

[0028] A diffusion bonding agent for aluminum alloy honeycomb plate brazing, the mass percentage of each component is: 15% of Si powder with a purity of 99% and a particle size range of 300-400 mesh, and 85% of Ga-In eutectic liquid alloy . Add Si powder into Ga-In eutectic liquid alloy and stir evenly to make a paste-like diffusion bonding agent.

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Abstract

The invention relates to a diffusion bonding agent for aluminum alloy honeycomb plate brazing and a diffusion brazing method. The mass percentages of each component in the diffusion bonding agent are: Ga-In eutectic liquid alloy 80-90% and Si powder 10-20% . The diffusion bonding agent is coated on the surface to be welded of the honeycomb core strip and the upper and lower panels, and after assembly, it is placed in a mesh belt type continuous brazing furnace for heating to obtain an aluminum alloy honeycomb panel. The active connecting agent of the invention can realize highly reliable, high-density, solder-free and flux-free connections between aluminum alloy honeycomb panels.

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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K20/02B23K35/36
CPCB23K20/026B23K35/3601
Inventor 龙伟民程亚芳张雷丁天然秦建董宏伟黄俊兰刘全明
Owner ZHENGZHOU RES INST OF MECHANICAL ENG CO LTD
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