Phase Transformation and Densification of Nanostructured Alumina. Effect of Seeding and Doping

Abstract:

By following the densification kinetics of nanocrystalline g alumina and corresponding microstructural evolution we showed that the diffusive transformation gamma-alpha involves several processes such as nucleation of alpha phase, rearrangement of gamma crystallite at alpha seed and grain surfaces, formation of porous alpha alumina monocrystalline colonies. Results concerning the effects of seeding and doping elements on the transformation-densification behaviour of the same g-alumina raw powder batch are also presented. Doping elements seem to have no influence on nucleation rate but could modify the redistribution rate of the ions during the transformation by short range diffusion of doping elements.

• Periodical: Defect and Diffusion Forum (Volumes 237-240)
• Pages: 665-670
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.237-240.665
• Online since: April 2005
• Authors: Corinne Legros, Claude Carry, Sylvie Lartigue-Korinek, Paul Bowen
• Keywords: Coarsening, Diffusive Phase Transformation, Doping, Grain Growth, Precipitation, Seeding, Segregation, Sintering, γ Nanocrystalline Alumina

References

[1] X.Z. Ding and X.H. Liu: J. Mater. Res. Vol. 13 (1998) p.2556.

[2] S.C. Liao, K.D. Pae, W.E. Mayo: Mater. Sci. and Eng. Vol. A204 (1995) p.152.

[3] F.W. Dynys and J.W. Halloran: J. Amer. Ceram. Soc. Vol. 65 (1982) p.442.

[4] G. L Messing, M. Kumagai: Am. Ceram. Soc. Bull. Vol. 73 (1994) p.88.

[5] C. Legros, C. Carry and P. Bowen, H. Hofmann: J. Eur. Ceram. Soc. Vol. 19 (1999) p. (1967).

[6] R.S. Mishra, C.E. Lesher, A.K. Mukherjee: J. Am. Ceram. Soc. Vol. 79 (1996) p.2989.

[7] L.A. Xue, I.W. Chen: J. Mat. Sci. Lett. Vol. 1 (1992) p.443.

[8] C. Carry, P. Bowen, F. Herbst, C. Legros: Sintering Science and Technologies (Ed. R.M. Germann, G.L. Messing, R.G. Cornwall, Penn. State Univ., PA USA 2000).

[9] P. Bowen, O. Charvin and H. Hofmann, C. Carry, C. Herard: Ceram. Trans. Vol. 83 (1998) p.211.

[10] P. Bowen, M. Staiger and H. Hofmann, C. Carry: Sintering Science and Technologies (Ed. R.M. Germann, G.L. Messing, R.G. Cornwall, Penn. State Univ., PA USA 2000) p.177.

[11] P.I. Gouma, M.J. Mills: J. Am. Ceram. Soc. Vol. 84.

[3] (2001) p.619.

[12] S. Lartigue-Korinek, C. Carry et L. Priester: J. Eur. Ceram. Soc. Vol. 22 (2002) p.1525.

[13] H. Yoshida, Y. Ikuhara and T. Sakuma: Acta Mater. , in press.

[14] H. Yoshida, T. Yamamoto, Y. Ikuhara and T. Sakuma: Phil. Mag. A Vol. 82 (2002) p.511.

[15] Y.M. Kim, S.H. Song and D.Y. Kim: J. Am. Ceram. Soc. Vol. 83 (2000) p.2809.

[16] M. Kitayama, J.D. Powers, L. Kulinski and A.M. Glaeser: Microstructures 96, (Ed. Edited by A.P. Tomsia and A.M. Glaeser. Plenum Press, Berkeley, CA USA 1998).

[17] J.D. Powers and A.M. Glaeser: Ceram. Eng. Sci. Proc. Vol. 18.

[4] (1997) p.617.

[18] E. Sato and C. Carry: J. Am. Ceram. Soc. Vol. 79 (1996) p.2156.