Abstract
In the previous paper, the new Au-Co-Ni casting alloys for dental magnetic appliance was studied. And the magnetic properties, melting temperature, mechanical properties and corrosion resistance of the alloys were reported. As a result, it was found that some Au-Co-Ni alloys had satisfied properties as dental casting ferromagnetc alloys, except to the corrosion resistance and fluidity. To improve those probrems, Pd, Cr and Si were added to selected compositions of the Au-Co-Ni alloys. The effect of such alloying elements on the Au-Co-Ni alloys was studied in this paper. Magnetic properties, range of solidification, crrosion resistance, mechanical properties, microstructures and magnetic attraction to Sm-Co magnet were examined. Results were as follows: 1. Crrosion resistance was improved by adding 15%Pd or 2%Cr and more. 2. The fluidities of Au-Co-Ni ternery alloys could be improved by adding 0.2%Si. 3. 34.8Au-15Pd-30Co-20Ni-0.2Si, 47.8Au-2Cr-30Co-20Ni-0.2Si, 66.8Au-10Pd-14Co-9Ni-0.2Si and 74.8Au-2Cr-14Co-9Ni-0.2Si were excellent as dental casting ferromagnetic alloys.
