[Studies on Pd-Co-Ni dental casting ferromagnetic alloys. (Part I) (author's transl)]

Many attempts have been made to use magnets as denture retention. But the magnet, such as alnico, ferrite or Pt-Co magnet, is not sufficient for our daily works. Recently, by using the rare earth metal-cobalt magnet, especially Sm-Co magnet, clinicians have gained good results. But magnet, itself, is not good for use in the mouth. Because it is scarcely possible to shape the magnet into suitable forms, it is easy to be broken by masticatory pressure, and its corrosion resistance is not sufficient and so on. To improve these difficulties, Pd-Co-Ni casting alloys which have soft ferromagnetic properties have been developed in this paper. Some metals were added to the alloy to improve the castability of the ferromagnetic alloy. Magnetic properties, range of solidification temperature and castability were examined. As a result, it was found that (43 Pd-27 Co-30 Ni)-10 Au-0.1 Si and (43 Pd-27 Co-30 Ni)-5 Cu-0.1 Si alloy had most excellent properties.