In Situ Platelet Reinforcement of Alumina and Zirconia Matrix Nanocomposites – One Concept, Different Reinforcement Mechanisms

Abstract:

Zirconia-alumina composites are structural ceramics which due to their high strength and toughness are interesting in biomedical and engineering applications. Reinforcement of such materials with in situ formed platelets can improve fracture toughness and reliability, the mechanisms are however not yet fully understood. In this study alumina and zirconia based composites (ZTA and ATZ) reinforced with various hexaaluminates were investigated. In ZTA materials the main effect of platelets is the improvement of toughness as the the grain size distribution of the microstructure is broadened and transformability of the zirconia dispersion is improved. Crack deflection by platelets is unimportant, toughening is commonly achieved at the expense of strength and hardness. In case of zirconia based composites results are strongly depending on the type of stabilizer (Y-TZP or Ce-TZP) used and the type of hexaaluminates formed in situ. Here platelets can cause crack deflection and crack bridging. By variation of the composite recipes a multitude of compositions can be produced which have mechanical properties tailored for individual applications.

• Periodical: Advances in Science and Technology (Volume 87)
• Pages: 118-125
• DOI: https://doi.org/10.4028/www.scientific.net/AST.87.118
• Online since: October 2014
• Authors: Frank Kern*, Rainer Gadow
• Keywords: Alumina, Nanocomposite, Platelets, Zirconia

References

[1] A.G. Evans, Perspective on the Development of High-Toughness Ceramics, J. Am. Ceram. Soc., 73.

[2] (1990) 187-205.

[2] K. Heussner, N. Claussen, Yttria- and ceria-stabilized tetragonal zirconia polycrystals (Y-TZP, Ce-TZP) reinforced with Al2O3 platelets, J. Eur. Ceram. Soc. 5.

DOI: 10.1016/0955-2219(89)90035-6

[3] (1989) 189-93.

[3] M.J. Hoffmann, Relationship between microstructure and mechanical properties of silicon nitride ceramics", Pure & Appl. Chem., 67.

[6] (1995) 939-946.

[4] M. Nader, F. Aldinger, M.J. Hoffmann, Influence of the α/β-SiC phase transformation on microstructural development and mechanical properties of liquid phase sintered silicon carbide, J. Mat. Sci. , 34.

[6] (1999) 1197-1204.

[5] P. L. Chen, I.W. Chen, In-Situ Alumina/Aluminate Platelet Composites, J. Am. Ceram. Soc., 75.

[9] (1992) 2610-12.

[6] W. Burger, H.G. Richter, High strength and toughness alumina matrix composites by transformation toughening and in situ, platelet reinforcement (ZPTA) – the new generation of bioceramics, Key Eng. Mat. 192-195, (2001] 545-48.

DOI: 10.4028/www.scientific.net/kem.192-195.545

[7] R.A. Cutler, R.J. Mayhew, K.M. Prettiman, A Virkar, High-Toughness Ce-TZP/Al2O3 Ceramics with Improved Hardness and Strength, J. Am. Ceram. Soc., 74.

DOI: 10.1002/chin.199116007

[1] (1991] 179-186.

[8] R. Guo, D. Guo, Y. Chen, Z. Yang, Q. Yuan, In situ formation of LaAl11O18 rodlike particles in ZTA ceramics and effect on the mechanical properties, Ceram. Int. 28, (2002) 699-704.

DOI: 10.1016/s0272-8842(02)00031-7

[9] M.H., A.G. Evans, J.W. Hutchinson, Crack deflection at an interface between dissimilar elastic materials – the role of residual stresses, Int. J. solids Struct., 31.

DOI: 10.1016/0020-7683(94)90025-6

[24] (1994) 3443-55.

[10] C. Schmid, E. Lucchini, O. Sbaizero, S. Maschio, The Synthesis of Calcium or Strontium Hexaluminate Added ZTA Composite Ceramics, J. Eur. Ceram. Soc. 19 (1999) 1741-1746.

DOI: 10.1016/s0955-2219(98)00277-5

[11] F. Kern, R. Gadow, Properties of Injection Moulded Alumina-Toughened Zirconia , J. Ceram. Sci. Techn. 2.

[1] (2010) 47-54.

[12] F. Kern, A comparison of microstructure and mechanical properties of 12Ce-TZP reinforced with alumina and in situ formed strontium- or lanthanum hexaaluminate precipitates, J. Eur. Ceram. Soc., 34.

DOI: 10.1016/j.jeurceramsoc.2013.08.037

[2] (2013) 413-23.

[13] F. Kern, Effect of ceriumhexaaluminate precipitates on properties of alumina -24 vol-% zirconia (1. 4Y) composites, J. Ceram. Sci. Techn., 4.

[4] (2013) 177-186.

[14] F. Kern, Evolution of microstructure, phase composition and mechanical properties in zirconia toughened alumina reinforced with cerium hexaaluminate precipitates, Scripta Materialia, 67.

DOI: 10.1016/j.scriptamat.2012.09.019

[12] (2012) 1007-1010.

[15] M. A. El Ezz, Manufacturing of injection molded ceramic nanocomposites for biomedical applications, Doctoral Thesis, University of Stuttgart, (2013).

[16] H. Toraya, M. Yoshimura, S. Somiya, Calibration Curve for Quantitative Analysis of the Monoclinic-Tetragonal ZrO2 System by X-Ray Diffraction, J. Am. Ceram. Soc., 67.

DOI: 10.1111/j.1151-2916.1984.tb19715.x

[6] (1984) C119-21.

[17] D.K. Kim, W. Kriven, Processing and Characterization of Multiphase Ceramic Composites Part II: Triplex Composites with a Wide Sintering Temperature Range, J. Am. Ceram. Soc., 91.

DOI: 10.1111/j.1551-2916.2008.02262.x

[3] (2008) 793–798.

[18] I. Akin, E. Yilmaz, F. Sahin, O. Yucel, G. Goller, Effect of CeO2 addition on densification and microstructure of Al2O3-YSZ composites, Ceram. Int., 37, (2011), 3273 – 3280.

DOI: 10.1016/j.ceramint.2011.05.123

[19] T. Kosmac, R. Wagner, N. Claussen, X-Ray Determination of Transformation Depths in Ceramics Containing Tetragonal ZrO2, J. Am. Ceram. Soc., 64.

DOI: 10.1111/j.1151-2916.1981.tb10285.x

[4] (1981) C72-3.

[20] P.M. Kelly, L.R.F. Rose, The martensitic transformation of ceramics – its role in transformation toughening, Progr. Mat. Sci., 67, (2002) 463-557.

DOI: 10.1016/s0079-6425(00)00005-0

[21] R.M. McMeeking, A.G. Evans, Mechanics of Transformation-Toughening in Brittle Materials, J. Am. Ceram. Soc., 65 (5), (1982) 242-46.

[22] M.H. He, J.W. Hutchinson, Kinking of a crack out of an interface, Transactions of the ASME.

[56] 270-278, (1989).