Aluminum silicon copper cerium brazing filler metal for brazing of silicon carbide particle reinforced aluminum matrix composite material and preparation method thereof

The invention provides an aluminum silicon copper cerium brazing filler metal for brazing of a silicon carbide particle reinforced aluminum matrix composite material and a preparation method thereof. The preparation method comprises the steps of placing pure Al and Al-20Si alloy into a crucible of a vacuum induction smelting furnace and leading high-purity argon gas into the crucible after vacuum pumping; quickly heating alloy to completely smelt the alloy, placing pure Cu into molten Al-Si alloy liquid through a feeding device on the induction smelting furnace to form Al-Si-Cu molten alloy; adding Al-10Ce alloy after even smelting, enabling the Al-10Ce alloy to react with the Al-Si-Cu molten alloy fully, performing magnetic stirring, keeping the temperature for 30-40 minutes, performing pouring and enabling a reactant to be cooled and solidified at the argon gas atmosphere; performing re-melting for two times by means of the same method and finally forming a rodlike material through pouring. The brazing filler metal contains few components , the smelting temperature is low, the wettability is good, a SiCp/Al composite material which is difficultly welded and formed can form a good welding connector by using the brazing filler metal at the temperature of about 580 DEG C, and the brazing filler metal is suitable for popularization and application.