Effect of Grain Size on Mechanical Properties of Submicrometer 3Y-TZP: Fracture Strength and Hydrothermal Degradation |
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| Authors: | Jens Eichler Jürgen Rödel Ulrich Eisele Mark Hoffman |
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| Affiliation: | Institute of Materials Science, University of Technology, Darmstadt, Petersenstr. 23, D-64287 Darmstadt, Germany; Robert Bosch GmbH, CR/ARM, D-70049 Stuttgart, Germany; The School of Materials Science &Engineering, The University of New South Wales, Sydney New South Wales 2052, Australia |
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| Abstract: | This paper considers fracture strength, fracture origins, and hydrothermal degradation of 3Y-TZP with grain sizes in the range of 110–480 nm. Biaxial fracture strength testing was used to show that the fracture strength increases with grain size and is governed by the concurrent change in fracture toughness. Hydrothermal degradation was studied by means of fractography, Raman microscopy and its effect on fracture strength. Up to 200 nm grain size, hydrothermal degradation of strength is limited. Larger grain sizes exhibit either premature failure or an increase in strength. A surface transformation zone was found to be responsible for both phenomena. |
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