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. 2013 May 16;6(5):2090–2102. doi: 10.3390/ma6052090

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© 2013 by the authors.

licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

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(a) Vickers hardness; (b) threshold for slow crack propagation obtained by the indentation test, as a function of the ZrO₂ volume fraction in the composites.