Evaluation and Control of Crack Propagation in Dense Porcelain/ Porous Alumina Layered Structures for Dental Material Applications


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Layered structures of dense porcelain/porous alumina and dense porcelain/porcelainalumina/ porous alumina are designed and their crack propagation behaviors are investigated. As a substrate, the porous alumina, which is prepared by a gel-casting process using the binary slip of alumina powder and PMMA spherical micro-bead, is dried at room temperature for 24 h and then sintered at 1600 for 2 h. Porcelain is coated on the porous alumina substrate and then re-sintered at 987. Bi- and tri-layered structures are produced by the different dwell times (2 min, 10 min) at re-sintering temperature. There is no delaminating or cracks observed after re-sintering the layered samples. The crack propagation behaviors in the bi- and tri-layered structures are evaluated by micro-indentation. The indentation cracks do not propagate into the porous alumina through interface (porosity; 36~62%) except for another one (porosity; 70%) in the bi-layered samples. In the case of the high porosity bi-layered sample (porosity; 70%), cracks are scattered along the 3-D open-pore channels. However, cracks do not propagate through the interface in the tri-layered samples with a porcelain-alumina buffer layer, because the porcelain-alumina buffer layer plays an important part such as a barrier layer in crack propagation.



Key Engineering Materials (Volumes 317-318)

Edited by:

T. Ohji, T. Sekino and K. Niihara






J. W. Kim et al., "Evaluation and Control of Crack Propagation in Dense Porcelain/ Porous Alumina Layered Structures for Dental Material Applications", Key Engineering Materials, Vols. 317-318, pp. 457-460, 2006

Online since:

August 2006




[1] R.A. Giordano: Compendium Vol. 17 (1996), p.779.

[2] Y.G. Jung, S. Wuttiphan, I.M. Peterson and B.R. Lawn: J. Dent. Res. Vol. 78 (1999), p.887.

[3] B.D. Flinn, R.K. Bordia, A. Zimmermann and J. Rodel: J. Euro. Ceram. Soc. Vol. 20 (2000), p.2561.

[4] R.W. Rice, Porosity of Ceramics (Marcel Dekker, Inc., New York, USA 1998).

[5] H.J. Jang, D.H. Park, Y.G. Jung and H.S. Lee: Mat. Res. Soc. Symp. Proc. Vol. 820 (2004), O8. 7.

[6] C.G. Ha, Y.G. Jung, J.W. Kim, C.Y. Jo and U. Paik: Mate. Sci. and Eng. A, Vol 337 (2002), p.212.

[7] K.S. Lee, S. Wuttiphan, X.Z. Hu, S.K. Lee and B.R. Lawn: J. Am. Ceram. Soc. Vol. 81 (1998), p.571. G G.

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