| Abstract |
| The newly developed α-case controlled mold material for Ti investment castings was suggested in this research. The Al2O3 mold containing interstitial TiO2 and substitutional Ti3Al was manufactured by the reaction between Al2O3 and Ti. It is obvious that as the TiO2 and Ti3Al content in the mold surface were increased, the depth of the interfacial reaction was significantly reduced. In addition, substitutional Ti5Si3 in the mold surface owing to the reaction between Ti and SiO2 from the binder was effective for α-case reduction. Therefore, the α-case reduction was accomplished by the diffusion barrier effect of interstitial TiO2, substitutional Ti3Al and Ti5Si3. |
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| Key Words |
| titanium, Liquid, solidification, microstructure, X-ray diffraction |
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