Influence of Al₂O₃ Addition on the Microstructure and Mechanical Properties of Pressureless Sintered Ce-TZP

Abstract:

Mixtures of 12 mol% CeO2-stabilised ZrO2 with 5 to 20 wt % Al2O3 were prepared and densified through pressureless sintering in air at 1450° C for 1 to 4 h. The influence of the Al2O3 content and sintering time on the phase constitution, microstructure and mechanical properties of the as-sintered composites were investigated. Fully dense Ce-TZP/Al2O3 ceramics with a good combination of hardness and fracture toughness can be obtained by pressureless sintering in air for only 1 h. The addition of Al2O3 to Ce-TZP improves the mechanical properties and suppresses ZrO2 grain growth. The average ZrO2 grain size increases with increasing sintering time and decreasing Al2O3 content. This leads to an increase in toughness. An excellent fracture toughness of 14.3 MPam1/2 in combination with a Vickers hardness of 9.14 GPa was obtained for 12 mol % CeO2-TZP with 5 wt % Al2O3, sintered for 4 h.

• Periodical: Materials Science Forum (Volumes 492-493)
• Pages: 783-0
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.492-493.783
• Online since: August 2005
• Authors: Shui Gen Huang, Lin Li, Jef Vleugels, Pei Ling Wang, Omer Van der Biest
• Keywords: Al₂O₃, Ce-TZP, Mechanical Property, Microstructure

References

[1] M. Hirano and H. Inada: J. Mater. Sci. Vol. 27 (1992), p.3511.

[2] RHJ. Hannink, PM. Kelly and BC. Muddle: J Am. Ceram. Soc. Vol. 83 (2000), p.461.

[3] JD. Cawley: Materials Science and Technology. Structure and properties of ceramics 11. (VCH, Weinheim, Germany) (1994), p.101.

[4] T. Sato and M. Shimada: Am. Ceram. Soc. Bull. Vol. 64 (1985), p.1382.

[5] K. Haussner and N. Claussen: J. Am. Ceram. Soc. Vol. 72 (1989), p.1044.

[6] GSAM. Theunissen, AJA. Winnubst and AJ. Burggraaf: J. Eur. Ceram. Soc. Vol. 9 (1992), p.251.

[7] R.A. Cutler, R. J. Mayhew and K. M. Prettyman: J. Am. Ceram. Soc. Vol. 74 (1991), p.179.

[8] D.B. Marshall, J.J. Ratto and F.F. Lange: J. Am. Ceram. Soc. Vol. 74 (1991), p.2979.

[9] A. Bleier, P. F. Becher and K. B. Alexander: J. Am. Ceram. Soc. Vol. 75 (1992), p.2619.

[10] M. Hirano and H. Inada: Br. Ceram. Trans. J. Vol. 90 (1991), p.48.

[11] K. -H. Haussner and N. Claussen: J. Europ. Ceram. Soc. Vol. 5 (1989), p.193.

[12] G.R. Anstis, P. Chantikul, BR. Lawn and DB Marshall: J. Am. Ceram. Soc. Vol. 64 (1981), p.533.

[13] E. Tani, M. Yoshimura, and S. Somiya: J. Am. Ceram. Soc. Vol. 66 (1983) p.506.

[14] L. Li and Z.Y. Xu and TY. Hsu: J. Mater. Sci. & Technol. Vol. 12 (1996) p.159.

[15] S. Huang, L. Li, J. Vleugels, O. Van der Biest and P. Wang: J. Mater. Sci. & Technol. Vol. 20 (2004) p.75.

[16] Z.X. Yuan, J. Vleugels, O. Van der Biest: Materials Letters. Vol. 46 (5) (2000) p.249.