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The aim of the present paper is to investigate the combined effect of mold material and binder for investment casting of titanium and titanium alloys. A plasma arc melting furnace was used for melting titanium alloy, and the interfacial reaction of titanium castings was determined by optical microscope, SEM, EDS analysis and hardness profile. The mold materials examined were ZrO2 ,A l 2O3, CaZrO3 and CaO. Machined graphite mold was examined for comparison. The result shows that the titanium castings produced using ZrO2 and Al2O3 mold had a clear reaction whereas a negligible reaction occurred in the castings in CaO, CaZrO3 and graphite molds. CaZrO3 is regarded as a promising mold material for titanium castings from the viewpoints of thermal stability against molten titanium alloy, sufficient mold handling strength and slurry viscosity control.

Effect of Mold Material and Binder on Metal-Mold Interfacial Reaction for Investment Castings of Titanium Alloys