Solder film for high temperature soldering and method of repairing or producing components using this solder film

An amorphous brazing material comprises a nickel (Ni)-based, cobalt (Co)-based, or Ni-Co-based foil having an upper side and a lower side being coated with a film of metallic Ni-based, Co-based, or Ni-Co-based braze powder with a particle size in a nanometer range, where both the foil and the braze powder comprise grain boundary stabilizing elements as alloying element. An independent claim is a method for producing or for repairing a component which is formed of at least two component elements made of single crystal or directionally solidified nickel-based, cobalt-based, or nickel-cobalt-based superalloys as a base material.