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Microstructure and Mechanical Properties of Hot-Pressed Alumina – 5 vol% Zirconia Nanocomposites
F. Kern
Institute for Manufacturing Technologies of Ceramic Components and Composites, University of Stuttgart, D-70569 Stuttgart, Allmandring 7b
received October 8, 2010, received in revised form October 16, 2010, accepted October 22, 2010
Vol. 2, No. 1, Pages 69-74 DOI: 10.4416/JCST2010-00038
Abstract
Zirconia-toughened alumina (ZTA) ceramics are known to combine the hardness and abrasion resistance of alumina with an additional toughness increment introduced by zirconia. Toughening occurs by transformation toughening and/or microcracking depending on the grain size and stabilizer content of zirconia. In this study ZTA with 5 vol% unstabilized nanozirconia was manufactured by means of a mixing and milling technique and consolidated by hot pressing at 1350 – 1600 °C. Variation of the sintering conditions leads to nanocomposites with different microstructural features, such as grain sizes and inter- or intragranular location of zirconia reinforcement. It was found that despite the low zirconia content, attractive hardness and strength levels as well as moderate toughness values can be obtained.
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Keywords
Nanocomposites, ZTA, sintering, microstructure, zirconia, alumina
References
1 Deville, S., Chevalier, J., Fantozzi, G., Bartolomé, J.F., Requena, J., Moya, J.S., Torrecillas, R., Díaz, L.A.: Development of Advanced Zirconia-Toughened Alumina Nanocomposites for Orthopaedic Applications, Key Engineering Materials, 264-268, 2013-2016, (2004).
2 Chevalier, J., Grandjean, S., Kuntz, M., Pezzotti, G..: On the kinetics and impact of tetragonal to monoclinic transformation in an alumina/zirconia composite for arthroplasty applications, Biomaterials, 30 [9], 5279-5282, (2009).
3 Becher, P., Swain, M.: Grain-Size-Dependent Transformation Behavior in Polycrystalline Tetragonal Zirconia, J. Am. Ceram. Soc., 75 [3], 493-502, (1992).
4 Claussen, N.: Fracture Toughness of Al2O3 with an Unstabilized ZrO2 Dispersed Phase, J. Am. Ceram. Soc., 59 [1-2], 49-51, (1976).
5 Lange, F.F.: Transformation toughening, part 4: Fabrication, fracture toughness and strength of Al2O3 - ZrO2 composites, J. Mat. Sci., 17, 247-254, (1982).
6 Heuer, A.H., Claussen, N., Kriven W.M., Rühle, M.: Stability of Tetragonal ZrO2 Particles in Ceramic Matrices, J. Am. Ceram. Soc., 65 [12], 642-650, (1982).
7 Chevalier, J., Deville, S., Fantozzi, G., Bartolome, J.F., Pecharroman, C., Moya, J.S., Diaz, L.A., Torrecillas, R.: Nanostructured Ceramic Oxides with a Slow Crack Growth Resistance Close to Covalent Materials, Nanoletters, 5 [7], 1297-1301, (2005).
8 Jia, Y., Hotta, Y., Sato, K., Watari, K.: Homogeneous ZrO2-Al2O3 composite prepared by Nano-ZrO2 particle multilayer coated Al2O3 particles, J. Am. Ceram. Soc., 89 [3], 1103-1106, (2006).
9 Palmero, P., Naglieri, V., Chevalier, J., Fantozzi, G., Montanaro, L.: Alumina-based nanocomposites obtained by doping with inorganic salt solutions: Application to immiscible and reactive systems, J. Eur. Ceram. Soc., 29 [1], 59-66, (2009).
10 Gadow, R., Kern, F.: Pressureless sintering of injection molded zirconia toughened alumina nanocomposites, J. Cer. Soc. Jap., 114 [11], 958-962, (2006).
11 Kern, F.: 2.5Y-TZP from yttria-coated pyrogenic zirconia nanopowder, J. Cer. Sci. Tech., 1 [1], 21-26, (2010).
12 Anstis, G.R., Chantikul, P., Lawn, B.R., Marshall, D.B.A.: A critical evaluation of indentation techniques for measuring fracture toughness. I. Direct crack measurements, J. Am. Ceram. Soc., 64, 533-538, (1981).
13 Niihara, K.: A fracture mechanics analysis of indentation-induced Palmqvist crack in ceramics, J. Mat. Sci. Let., 2, 221-223, (1983)
14 Quinn G.D., Bradt R.C.: On the Vickers Indentation Fracture Toughness Test, J. Am. Ceram. Soc., 90 [3], 673-680, (2007).
15 Chantikul, P., Anstis, G.R., Lawn, B.R., Marshall, D.B.A.: A critical evaluation of indentation techniques for measuring fracture toughness. II. Strength method, J. Am. Ceram. Soc., 64, 539-543, (1981).
16 Toraya, H., Yoshimura, M., Somiya, S.: Calibration Curve for Quantitative Analysis of the Monoclinic-Tetragonal ZrO2 System by X-Ray Diffraction, J. Am. Ceram. Soc., 67, 6, C119-121, (1984).
17 Mendelson, M.I.: Average grain size in polycrystalline ceramics, J. Am. Ceram. Soc., 52, 443, (1969).
18 Patterson, A.L.: The Scherrer formula for X-Ray particle size determination, Physical Review, 56, 978-982, (1939).
19 Lange, F.F., Hirlinger, M.: Hindrance of Grain Growth in Al2O3 by ZrO2 Inclusions, J. Am. Ceram. Soc., 67 [3], 164-168, (1982).
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