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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Nanoscale physico-mechanical properties of an aging resistant ZTA composite

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Author(s):
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Benalcazar Jalkh, E. B. [1, 2] ; Coelho, P. G. [1, 3, 4] ; Witek, L. [1, 5] ; Bergamo, E. T. P. [2] ; Lopes, A. C. O. [2] ; Monteiro, K. N. [6] ; Cesar, P. F. [6] ; Genova, L. A. [7] ; Lisboa-Filho, P. N. [8] ; Abreu, J. L. B. [1, 9] ; Campos, T. M. B. [10] ; Canteenwala, A. [11] ; Bonfante, E. A. [2]
Total Authors: 13
Affiliation:
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[1] NYU, Coll Dent, Dept Biomat, New York, NY - USA
[2] Univ Sao Paulo, Dept Prosthodont & Periodontol, Bauru Sch Dent, Al Otavio Pinheiro Brisola 9-75, Bauru, SP - Brazil
[3] NYU Langone Med Ctr, Hansjorg Wyss Dept Plast Surg, New York, NY - USA
[4] NYU Tandon Sch Engn, Dept Mech & Aerosp Engn, Brooklyn, NY - USA
[5] NYU Tandon Sch Engn, Dept Biomed Engn, Brooklyn, NY - USA
[6] Univ Sao Paulo, Sch Dent, Dept Biomat & Oral Biol, Sao Paulo, SP - Brazil
[7] Inst Res Nucl Energy, Sao Paulo, SP - Brazil
[8] Sao Paulo State Univ, Dept Phys, Bauru, SP - Brazil
[9] Fed Fluminense Univ UFF, Sch Dent, Analyt Lab Restorat Biomat LABiom R, Niteroi, RJ - Brazil
[10] Technol Inst Aeronaut ITA, Sao Jose Dos Campos, SP - Brazil
[11] McMaster Univ, Integrated Biomed Engn & Hlth Sci, Hamilton, ON - Canada
Total Affiliations: 11
Document type: Journal article
Source: JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS; v. 123, NOV 2021.
Web of Science Citations: 0
Abstract

Objective: To characterize the effects of aging on the nanomechanical properties and 3D surface topographical parameters of an experimental Zirconia Toughened Alumina (ZTA) composite compared to its respective individual counterpart materials. Methods: Disk-shaped specimens comprised of three material groups were processed: 1) ZTA 70/30 (70% alumina reinforced with 30% second-generation 3Y-TZP); 2) Zpex (Second-generation 3Y-TZP), and; 3) Al2O3 (High purity Alumina) (n = 10/material, 12 x 1 mm). After synthesis, ceramic powders were pressed, the green-body samples were sintered and polished. Nanoindentation testing was performed to record elastic modulus (E) and hardness (H). Interferometry was utilized to assess 3D surface roughness parameters (Sa, Sq), while X-ray diffraction (XRD) and scanning electron microscope (SEM) assessed the crystalline content and microstructure. All tests were performed before and after simulated aging (134 degrees C, 2.2 bar, 20 h). Statistical analyses were performed using linear mixed-model and least square difference pos-hoc tests (alpha = 5%). Results: XRD spectra indicated increase of monoclinic peaks for Zpex (-18%) relative to ZTA 70/30 (-2.5%) after aging. Additionally, aging did not affect the surface roughness parameters of ZTA 70/30 and Al2O3, although a significant increase in Sa was recorded for Zpex following aging (-90 nm) (p < 0.001). Al2O3 yielded the highest H and E values (H:21 GPa, E: 254 GPa), followed by ZTA 70/30 (H: 13 GPa, E: 214 GPa) and Zpex (H:11 GPa, E: 167 GPa), all significantly different (p < 0.03). Conclusion: ZTA 70/30 and Al2O3 presented high hydrothermal stability with respect to all evaluated variables, where artificial aging significantly increased the monoclinic content and surface roughness of Zpex. (AU)

FAPESP's process: 18/03072-6 - Experimental 70% Al2O3-30% ZrO2 composites: structural characterization and survival probability before and after aging
Grantee:Ernesto Byron Benalcazar Jalkh
Support Opportunities: Scholarships in Brazil - Doctorate
FAPESP's process: 19/08693-1 - Experimental glass-infiltrated alumina-zirconia composites: characterization of microstructure, optical and mechanical properties.
Grantee:Edmara Tatiely Pedroso Bergamo
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 12/19078-7 - Development and processing of Al2O3-ZrO2 translucent composite for CAD/CAM monolithic prostheses: the effect of aging on biaxial flexural strength
Grantee:Estevam Augusto Bonfante
Support Opportunities: Research Grants - Young Investigators Grants
FAPESP's process: 16/18818-8 - Multi-User Equipment approved in grant 2012/19078-7: ElectroPuls E3000 Linear-Torsion All-Electric dynamic test instrument package
Grantee:Estevam Augusto Bonfante
Support Opportunities: Multi-user Equipment Program
FAPESP's process: 19/00452-5 - EXPERIMENTAL 70%Al2O3-30%ZrO2 ZTA COMPOSITES: MECHANICAL, ESTRUCTURAL AND TOPHOGRAPHICAL CHARACTERIZATION
Grantee:Ernesto Byron Benalcazar Jalkh
Support Opportunities: Scholarships abroad - Research Internship - Doctorate
FAPESP's process: 17/19362-0 - DEVELOPMENT, MECHANICAL AND OPTICAL CHARACTERIZATION OF 80% AL2O3 AND 20% ZRO2 ZTA COMPOSITES FOR CAD/CAM PROSTHESES
Grantee:Adolfo Coelho de Oliveira Lopes
Support Opportunities: Scholarships abroad - Research Internship - Master's degree
FAPESP's process: 16/17793-1 - Development and mechanical and optical characterization of 80% Al2O3 and 20% ZrO2 translucent composites for CAD/CAM monolithic prostheses
Grantee:Adolfo Coelho de Oliveira Lopes
Support Opportunities: Scholarships in Brazil - Master