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Title
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Critical influence of alumina content on the low temperature degradation of 2-3 mol% yttria-stabilized TZP for dental restorations
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Author
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Abstract
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| The influence of 0.25, 2 and 5 wt.% alumina addition on the mechanical properties and low temperature degradation (LTD) of 3, 2.5 and 2 mol% yttria-stabilized TZP ceramics was investigated. The amount of alumina addition was observed to have a crucial impact on the degradation of Y-TZP ceramics. Independent on the yttria stabilizer content, 0.25 wt.% alumina had a higher degradation retarding effect to Y-TZP ceramics than 2 and 5 wt.% of alumina addition, which had a comparable effect. The apparent activation energy for the degradation process was increased by adding alumina, but it was the same for 0.255 wt.% alumina doped 3Y-TZP ceramics. For Y-TZPs containing a small amount of alumina addition, only the segregated Al3+ at the grain boundaries of the zirconia grains was effective to retard the degradation of Y-TZPs. The secondary phase Al2O3 grains increased the degradation kinetics, which might be attributed to the residual stresses. |
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Language
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English
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Source (journal)
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Journal of the European Ceramic Society. - Barking
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Publication
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Barking
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2015
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ISSN
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0955-2219
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DOI
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10.1016/J.JEURCERAMSOC.2014.09.018
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Volume/pages
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35
:2
(2015)
, p. 741-750
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ISI
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000345201700032
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Full text (Publisher's DOI)
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Full text (publisher's version - intranet only)
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