Wettability of TiAl alloy melt on ceramic moulds in electromagnetic field
(1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China2. Beijing Institute of Aeronautical Materials, Beijing 100095, China)
Abstract: In the electromagnetic field, the wettability between Ti50Al alloy melt and oxide ceramic moulds was studied by the self-designed measuring apparatus. The thermodynamic and kinetic laws and mechanism on wetting were studied systematically. The results show that in the electromagnetic field, the order of contact angles for the molten Ti50Al alloy for the eight oxide materials is θ(Y2O3)＞θ(ZrO2(Y2O3))＞θ(ZrO2(CaO))＞θ(CaO)＞θ(ZrO2(MgO))＞θ(Al2O3)＞θ(Zircon)＞θ(MgO). The wetting process of Ti50Al alloy and ceramic moulds includes the nonreactive wetting at the first stage, and the reactive wetting at the final stage. And the higher the ceramic chemical stability, the longer the nonreactive wetting time.
Key words: TiAl alloy; ceramic; electromagnetic field; wettability; interfacial reaction