Abstract
In a previous paper, it was found that Ti-15〜20wt% Cr and Ti-20〜25wt% Pd have high tensile strength, good ductility, adequate hardness, good castability and good fitness as dental casting alloys.The purpose of this study is to investigate the effects of third elements in Ti-20wt% Cr and Ti-25wt% Pd on mechanical properties and microstructure, surface of casting and castability.(Ti-20Cr)-Al, (Ti-20Cr)-B, (Ti-20Cr)-Si and(Ti-25Pd)-Cr were cast into phosphate bonded investments by using an argon arc melt/argon pressure casting machine.The following results were obtained:(Ti-20Cr)-0.1, 0.2Si, (Ti-25Pd)-1, 2, 5Cr have better mechanical properties, castability, and fitness than Ti-20Cr or Ti-25Pd.Especially, surface roughness of these castings are smoother than those of Ti-20Cr or Ti-25Pd.(Ti-20Cr)-1, 2Al have a few problems in the fluidity of the melts, but besides that possess exceptional characteristics as dental casting alloys.
