VERFAHREN, SYSTEM UND ZUSAMMENSETZUNG ZUM INDUKTIONSLÖTEN

摘要

This invention provides a method for soldering using induction heating, which is accomplished by the use of lossy heating particles in or on the solder. The method of this invention provides direct heating of the solder itself through induction heating of the magnetic particles in an alternating magnetic field. The magnetic particles useful in this invention can be ferromagnetic particles or ferrimagnetic particles, preferably ferrites, which have a Curie temperature at least equal to the flow temperature of the solder. Selection of the magnetic lossy heating particles with the appropriate Curie temperature for the system in which the particles are being used provides a system in which the temperature is self-regulating when the alternating magnetic field is applied. This self-regulation feature prevents overheating of the solder in the articles being soldered. The invention also discloses the selection of particles with surface properties whereby the particles can either be wetted by the solder and remain in the solder when the solder flows or it can be nonwettable by the solder whereby the particles separate from the solder when the solder flows. The surface properties can also be provided by coatings on the particles. This invention also discloses solder compositions comprising solder and lossy heating particles which produce the desired heat in an alternating magnetic field. The invention also provides systems and assemblies for the use of the above method and composition.