한국주조공학회

Hardening behavior and metal-mold reaction of phosphate bonded investments for titanium and titanium alloys were investigated. Alumina and zirconia, which are thermodynamically more stable than Titania, were used as major filler materials. was used as binder, and MgO was used as hardening acceleration material. A different composition ratio of binder and hardening acceleration material had effected on general hardening behavior and castings. And adding zirconia to alumina, metal-mold reaction characteristics for castings was evaluated. Considering working conditions and effects on castings, the best composition ratio conditions were both 10:10 and 12:8(). On the other hand, increasing the contents of $Y_2O_3-stabilized zirconia for filler material, metal-mold reaction layer of titanium castings was greatly decreased.