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http://dx.doi.org/10.3365/KJMM.2011.49.7.577

α-case Interfacial Reaction Behavior of Al2O3 Mold Containing Interstitial and Substitutional Compounds for Titanium Investment Casting  

Choi, Bong-Jae (Sungkyunkwan University, School of Advanced Materials Science and Engineering)
Lee, Seul (Sungkyunkwan University, School of Advanced Materials Science and Engineering)
Kim, Young-Jig (Sungkyunkwan University, School of Advanced Materials Science and Engineering)
Publication Information
Korean Journal of Metals and Materials / v.49, no.7, 2011 , pp. 577-582 More about this Journal
Abstract
The newly developed ${\alpha}-case$ controlled mold material for Ti investment castings was suggested in this research. The $Al_2O_3$ mold containing interstitial $TiO_2$ and substitutional $Ti_3Al$ was manufactured by the reaction between $Al_2O_3$ and Ti. It is obvious that as the $TiO_2$ and $Ti_3Al$ content in the mold surface were increased, the depth of the interfacial reaction was significantly reduced. In addition, substitutional $Ti_5Si_3$ in the mold surface owing to the reaction between Ti and $SiO_2$ from the binder was effective for ${\alpha}-case$ reduction. Therefore, the ${\alpha}-case$ reduction was accomplished by the diffusion barrier effect of interstitial $TiO_2$, substitutional $Ti_3Al$ and $Ti_5Si_3$.
Keywords
titanium; liquid; solidification; microstructure; X-ray diffraction;
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