Interactions between Ti and alumina-based ceramics
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Reactive metal coatings have been frequently used on ceramic materials for various purposes. However, little work was done in the past to understand the interactions between coating and ceramic substrates and their effects on the mechanical properties of the ceramics. In this study, titanium coatings were applied to single-crystal (sapphire) and polycrystalline alumina to study the interface reactions. Also, the effect of the coating on the mechanical properties of the substrates was quantified in terms of modulus of rupture (MOR) in four-point bending strength. Reactions between the coating and the Al2O3-based substrates at 980°C caused the formation of a new phase, Ti3Al[O], and a significant decrease (15%–65%) in the MOR strength of the ceramic materials. This study showed that in polycrystalline alumina, interactions between titanium and the glassy grain-boundary phase in the ceramic materials were responsible for reduction in the MOR strength, while the effect of thermal expansion mismatch between titanium and the ceramic substrate appeared to be dominant for singlecrystal alumina.
KeywordsPolymer Alumina Titanium Mechanical Property Thermal Expansion
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- 1.K. R. Kinsman, in “Electronic Packaging and Corrosion in Microelectronics”, Vol. 1 (American Society for Metals, Metals Park, OH, 1987).Google Scholar
- 2.D. Hull, in “An Introduction to Composite Materials” (Cambridge University Press New York, 1981).Google Scholar
- 3.S. Kang, E. M. Dunn, J. H. Selverian and H. J. Kim, Amer. Ceram. Soc. Bull. 68 (1989) 1608.Google Scholar
- 4.S. Kang and J. H. Selverian, Amer. Ceram. Soc. J. (1991) submitted.Google Scholar
- 5.Y. S. Chang, N. J. Chou and H. Kim, J. Vac. Sci. Technol. A 54 (1987) 1288.Google Scholar
- 7.S. K. Choi, L. Froyen and M. J. Brabers, in “High Tech Ceramics” (Elsevier Science, New York, 1987) pp. 407–13.Google Scholar
- 10.C. Sung and K. Ostreicher, presented at the 15th Annual Conference on Composites and Advanced Ceramics”, Cocoa Beach, FL (1991).Google Scholar
- 12.M. G. Nicholas, in “Proceedings of the Materials Research Society International Meeting on Advanced Materials”, Vol. 8 (1989) pp. 49–59.Google Scholar
- 13.W. Braue, G. Wotting and G. Ziegler, in “Proceedings of the 2nd International Symposium on Ceramic Materials and Composites for Engine”, Lubeck-Travemunde, FRG, 14–17, Apr. edited by W. Bunk and H. Hausner (Verlag Deutsche Keramische Gesellschaft 1986) pp. 503–510.Google Scholar
- 14.G. E. Hilmas and W. E. Lee, in “Proceedings of the 46th Annual Meeting of the Electron Microscopy Society of America”, San Francisco, CA (San Francisco Press, 1988) pp. 608–609.Google Scholar
- 18.J. W. Newkirk and G. B. Feldewerth, ibid. 133 (1989) 681.Google Scholar