Abstract
The objective of this study is to develop a new dental casting titanium alloy having a low melting point, good castability, and excellent mechanical properties. Twenty-five alloys from β-stabilized binary systems (Ti-Ag, Ti-Cu, Ti-Co, Ti-Cr, Ti-Fe, Ti-Mn, Ti-Pd and Ti-Si) and isomorphous binary system (Ti-Zr) were cast into the phosphate-bonded investment by using an argon arc melt/argon pressure casting machine. Castings of these alloys were evaluated metallurgically and by mechanical property testing. Ti-15 wt% Cr, Ti-12 wt% Mn, Ti-20 wt% Pd and Ti-50 wt% Zr were selected as basic titanium alloy systems. Castings of these alloys contained fewer casting defects, had high tensile strength, good ductility, and adequate hardness for the dental casting alloys. Microstructures of cast Ti-15 wt% Cr, Ti-12 wt% Mn and Ti-20 wt% Pd were observed to have retained β-titanium.The Ti-50 wt% Zr might have converted to α-titanium.
