Effect of different primary coating materials and mold temperatures on fluidity of high-temperature titanium alloy

In this study, the fluidity of near-α high-temperature titanium alloy with different primary coating materials (Y 2 O 3 , ZrO 2 and Al 2 O 3 ) and mold temperatures were investigated. The fluidity as an index of castability was evaluated by a fluidity spiral pattern. The Y 2 O 3 primary coating presents the best fluidity and weakest interfacial reaction compared with the ZrO 2 and Al 2 O 3 primary coating. The effect of interfacial reaction resulting from different mold materials on fluidity is determined by the stability of mold materials. The interfacial reaction becomes more and more severe with increasing mold preheating temperature. The fluidity does not increase with increasing mold preheating temperature owing to the effect of interfacial reaction. The fluidity is greatly improved at 900 °C, while decreases at 600 °C, indicating the fluidity, depends on the interaction between the interfacial reaction and chilling effect of the mold.