Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 33, Issue 15-16, Pages 3145-3155Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2013.06.007
Keywords
Diffusion; Mechanical properties; ZrO2; Biomedical applications
Categories
Funding
- Spanish Ministerio de Ciencia e Innovacion [MAT2008-03398]
- Spanish Ministerio de Educacion, Cultura y Deporte
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3Y-TZP has been one of the most applied ceramics in the biomedical field, specifically for hip, knee and dental implants, given its high strength, moderate fracture toughness and excellent biocompatibility. However, hydrothermal degradation has meant an important disadvantage, as surface t-m transformation, followed by microcracking, can lead to the premature failure of the implant. In this work, surface nitriding at 1600, 1500 and 1400 degrees C for 1,2 and 4 h with N-2 gas and ZrN powder was applied and optimised to avoid hydrothermal degradation. Nitriding at 1600 and 1500 degrees C produces a harder low-toughness surface, not adequate for structural implants. It is shown that the most favourable condition is nitriding at 1400 degrees C for 1 h, since the mechanical properties of the original 3Y-TZP are not affected with the advantage of retarding hydrothermal degradation by a factor close to 10. (C) 2013 Elsevier Ltd. All rights reserved.
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