Interfacial Reactions between Titanium and Titanium Dioxide/Calcium Oxide/Yttriia Composites

Description

Abstract: Various proportions of TiO₂ /CaO /Y₂O₃ powders were mixed and hot-pressed at 1500^oC for 30min for titanium casting application. The hot-pressed specimens, consisted of Ca₄Ti₃O₁₀ and Y₂O₃, were reacted with the commercially pure titanium at 1600^oC for 30min in the atmosphere of argon. The interfacial reactions between ceramic specimens and titanium were explored using an X-ray diffraction diffractometer (XRD), analytical scanning electron microscope (SEM), and transmission electron microscopy (TEM), and energy dispersive spectrometer (EDS). After reaction between Ti and ceramics, no any reactional phases were found in the Ti region near interface excepting minor oxygen dissolution from the ceramic. Furthermore, alpha Ti and Y₂O₃– rich two phases appeared at ceramic side near the interface. With increasing in the amount of Y₂O₃ in ceramic, the Y₂O₃-rich layer gradually changed thicker and was coarser far away from interface.

Authors: Kuan-Ting Lin, Kun-Lin Lin, and Chien-Cheng Lin

Keywords: Ca₄Ti₃O₁₀, CaTiO₃, Y₂O₃, Titanium