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Y-TZP nanostructures with non-homogeneous yttria distribution for improved hydrothermal degradation resistance and mechanical properties

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Author(s):
Goulart, Celso Antonio ; Piza, Mariana Miranda de Toledo ; Campos, Tiago Moreira Bastos ; Bonfante, Estevam Augusto ; Filho Lisboa, Paulo Noronha
Total Authors: 5
Document type: Journal article
Source: CERAMICS INTERNATIONAL; v. 49, n. 13, p. 13-pg., 2023-05-25.
Abstract

Dense and homogeneous nanostructured Y-TZP ceramics were prepared by colloidal processing and 2-step sin-tering using commercial powders. The influence of non-homogeneous yttria distributions on mechanical prop-erties and Low-Temperature Degradation (LTD) resistance were assessed. Physical, structural, microstructural, and mechanical characterizations of all groups were evaluated and compared before and after artificial aging. Nanostructured Y-TZP samples with non-homogeneous yttria distributions presented the highest fracture toughness and elevated fracture strength. These samples were susceptible to LTD, but with the transformed monoclinic phase fraction restricted to the near-surface region. The characterization data of nanostructured samples were compared to those of conventional 3Y-TZP. The results of this work indicate that it may be possible to prepare Y-TZP ceramics with improved mechanical properties and resistance to LTD by careful and systematic design and engineering of nanostructures. (AU)

FAPESP's process: 21/06730-7 - Towards sustainable zirconia recycled from milling waste and boosted by glass infiltration for restorative use, and of the development of strong, graded, and aging resistant multilayered zirconia blocks
Grantee:Estevam Augusto Bonfante
Support Opportunities: Research Grants - Young Investigators Grants - Phase 2
FAPESP's process: 20/12874-9 - Infiltration graded by glass in an experimental composite based on whiskers of alumina and zircônia: development, microstructural characterization and optical and mechanical properties
Grantee:Tiago Moreira Bastos Campos
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 22/05496-3 - Multi-user equipment approved in grant 21/06730-7: Macrodurômetro VH1150 - Buehler
Grantee:Estevam Augusto Bonfante
Support Opportunities: Multi-user Equipment Program
FAPESP's process: 21/04697-2 - Nanostructures for the development of high-performance dental Y-TZP ceramics
Grantee:Celso Antonio Goulart
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 20/16500-6 - Synthesis of an ATZ nanocomposite (80%ZrO2-20%Al2O3) and microstructural, optical and survival characterization before and after aging
Grantee:Mariana Miranda de Toledo Piza
Support Opportunities: Scholarships in Brazil - Master