Composite aluminum-based brazing wire based on micron Al2O3 and preparation method thereof

Abstract

The invention discloses a composite aluminum-based brazing wire based on micron Al2O3 and a preparation method thereof. The composite aluminum-based brazing wire comprises the following chemical ingredients in parts by weight: 75.24-82.92 parts of Al, 9-11 parts of Si, 3-6 parts of Cu, 5-7 parts of Zn, 0.01-0.1 part of a microelement Mg, 0.01-0.06 part of a microelement Sr, 0.01-0.1 part of microelement rare earth Ce and 0.05-0.5 part of micron Al2O3. The preparation method comprises the following steps: embedding the micron Al2O3 particles onto the surfaces of pure aluminium powder particlesto form an aluminium-embedded micron Al2O3 particle pile; after that, preparing a solder alloy high-temperature melt; adding the aluminium-embedded micron Al2O3 particle pile into the solder melt by means of mechanical stirring; and uniformly dispersing the micron Al2O3 particles released after the aluminium powder particles are molten to obtain the composite aluminum-based brazing wire. The preparation method is easy to operate and implement; the micron Al2O3 particles of the composite aluminum-based brazing wire prepared by the preparation method are uniformly distributed in an aluminium-based solder matrix to play a dispersion strengthening role; and the defects that a soldered joint has high probability of fracture and is low in bearing capability are avoided.

Description

technical field [0001] The invention relates to the field of material technology, specifically a micron-based Al 2 o 3 Composite aluminum-based brazing wire and a preparation method thereof. Background technique [0002] In the past ten years, with the rapid development of manufacturing scale and manufacturing technology of modern transportation tools, including high-speed trains, new energy vehicles, aerospace vehicles, and ordinary improved vehicles, electric vehicles, etc., more and more high-strength aluminum alloy components are used. , the weight proportion of high-strength aluminum alloy in a single device is getting higher and higher, and at the same time, high requirements are put forward for the connection technology of various shell aluminum alloy components. One of the important connection technologies is aluminum-based brazing , because the aluminum-based brazing components, including the entire equipment shell, will not produce significant deformation, there ...

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Problems solved by technology

But in fact, due to the fact that the nanoparticles are too fine, under the conditions of large furnace production, the ultrasonic dispersion system cannot completely prevent the agglomeration of the nanoparticles, making them re-agglomerate to form particles with a large particle size, and cannot effectively refine the grain structure of the matrix. The strengthening effect is greatly reduced, resulting in the performance of the aluminum-based solder still not meeting the technical requirements of practical applications