Copper-based amorphous foils are amorphous brazing fillers made by rapid solidification technology, exhibiting unique advantages with a homogeneous structure free of crystalline defects. They are widely used in the welding of precision instruments, circuits and components, contacts, heat exchangers, etc., as well as the brazing of copper and copper alloys. The joint strength can reach 98-137 MPa, and the specific chemical composition is as follows: