| Summary: | 碩士 === 國立交通大學 === 材料科學與工程學系奈米科技碩博士班 === 103 === Vanious proportions of TiO2 / CaO / Y2O3 powders were mixed and hot pressed at 1500°C for 30min. These hot-pressed specimens reacted with the commercially pure titanium at 1600°C for 30min in 1 atm argon atmosphere. The high temperature interfacial reactions were explored between each ceramic specimen and titanium metal. The interface microstructures were analyzed using an X-ray diffraction diffractometer (XRD) and an analytic scanning electron microscope (ASEM).
When ceramic specimens reacted with titanium at 1600°C for 30min, the oxygen would be dissolved to the titanium to form α-Ti due to the great affinity between oxygen and titanium, resulting in the hypoxia phenomenon in the ceramic side near the interface. In the Ca4Ti3O10 specimens incorporating with Y2O3, Y2O3 formed network in the interior ceramic specimens with the volume ratio of Y2O3 was more than 20%. When the ceramic specimens reacted with titanium, Y2O3 would diffuse to the interface due to ambipolar diffusion, the titanium would diffuse to the ceramic side and the oxygen in Y2O3 would be dissolved to the titanium side, so that, a Y2O3-y and α-Ti layer was formed. With increasing in the amount of Y2O3, the layer would be thicker. The Y2O3 phase in the far away from interface would be coarser.
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