Vacuum high-temperature aluminum solder and preparation method thereof

Abstract

The invention discloses a vacuum high-temperature aluminum solder and a preparation method of the vacuum high-temperature aluminum solder. The preparation method of the vacuum high-temperature aluminum solder comprises the following steps that preprocessed aluminum ingots are taken and smelted with the furnace temperature controlled to be 700-750 DEG C; after the aluminum ingots are fully smelted, surface covering agents are added to a furnace to cover the surface of molten aluminum; monocrystalline silicon is added to the molten aluminum immediately, and the furnace temperature keeps 700-780 DEG C; after the silicon is smelted, lanthanum salt modifier is added to the molten aluminum; magnesium metal is added into the molten aluminum, and the temperature is maintained for 30-60 minutes after the magnesium metal is smelted; strontium metal is added into the molten aluminum, and the temperature is maintained for 8-20 minutes after the strontium metal is smelted; finally, slag in the mixed solution in the furnace is removed, and then vacuum high-temperature aluminum solder is obtained in a pouring mode. The mobility of the vacuum high-temperature aluminum solder on the surface of aluminum alloy is obviously improved, welding seams have no obvious welding lack phenomenon after welding, and the result of non-destructive testing shows that the welding seams are uniform in structure, and no obvious defect such as insufficient welding or welding lack exists.

Description

Technical field [0001] The invention relates to the technical field of material welding processing, in particular to a vacuum high-temperature aluminum brazing filler metal used for aluminum alloys and a preparation method thereof. Background technique [0002] Vacuum high-temperature brazing is an effective processing technology for the processing and forming of aluminum alloy complex structural parts. It solves the problem that the traditional furnace welding process cannot effectively remove the aluminum alloy surface oxide film and the complex cavity structural parts after welding in the traditional furnace. The problem of flux removal. Among them, the quality of the vacuum high-temperature aluminum solder required in the brazing process plays a vital role in the processing effect. At present, the commonly used vacuum high-temperature aluminum solder is prepared by adding active elements on the basis of Al-Si eutectic solder, but the main problems are: the spreadability of t...

AI Technical Summary

Problems solved by technology

At present, the commonly used vacuum high-temperature aluminum solder is prepared by adding active elements on the basis of Al-Si eutectic solder, but the main problems are: the spreadability of the solder is poor, and it is easy to form virtual and missing soldering phenomena; The dendrite structure of the Al-Si matrix has poor plasticity and poor processing performance; the long-term deterioration effect is not good, and the metallographic structure of the weld reappears the dendrite structure, resulting in a decline in the mechanical properties of the weld

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