TY - JOUR
T1 - Stability of fatigued and aged ZTA compared to 3Y-TZP and Al2O3 ceramic systems
AU - Benalcázar Jalkh, Ernesto B.
AU - Bergamo, Edmara T.P.
AU - Campos, Tiago M.B.
AU - de Araújo-Júnior, Everardo N.S.
AU - Lopes, Adolfo C.O.
AU - Tebcherani, Sérgio M.
AU - Yamaguchi, Satoshi
AU - Genova, Luis A.
AU - Gierthmuehlen, Petra C.
AU - Witek, Lukasz
AU - Coelho, Paulo
AU - Bonfante, Estevam A.
N1 - Funding Information:
This work was supported by São Paulo Reuter Foundation (FAPESP), grant # 2012/19078-7 , 2021/06730-7 , EMU 2016/18818-8 , and scholarships # 2022/07157-1 ; 2018/03072-6 ; 2019/00452-5 ; 2019/08693-1 and BEPE 2021/08018-2 ; 2016/17793-1 and 2017/19362-0 . By Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Grant # 307255/2021-2 . By CAPES Financial Code 001.
Funding Information:
This work was supported by São Paulo Reuter Foundation (FAPESP), grant # 2012/19078-7, 2021/06730-7, EMU 2016/18818-8, and scholarships # 2022/07157-1; 2018/03072-6; 2019/00452-5; 2019/08693-1 and BEPE 2021/08018-2; 2016/17793-1 and 2017/19362-0. By Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), Grant # 307255/2021-2. By CAPES Financial Code 001.
Publisher Copyright:
© 2022 Elsevier Ltd
PY - 2022/11
Y1 - 2022/11
N2 - To evaluate the effect of fatigue and aging on the crystalline content and reliability of a zirconia-toughened-alumina (ZTA) composite compared to its individual counterpart materials (3Y-TZP and Al2O3). Thirty-six disc-shaped specimens per group were obtained to comply with ISO 6872:2015. Crystalline content, microstructure and reliability of experimental groups were evaluated in four stages: 1) immediate; 2) aged; 3) fatigued; 4) aged + fatigue. Aging was performed in autoclave and Step-Stress-Accelerated-Life-Testing (SSALT) was performed using three stress profiles. Weibull statistics were used to determine Weibull parameters and life-expectancy. A significant increase in monoclinic phase in 3Y-TZP was observed after aging (19.31%), fatigue (17.88%) and aging + fatigue (55.81%), while ZTA evidenced minimal variation among all conditions (<5.69%). 3Y-TZP presented higher reliability than ZTA at 300 and 500 MPa, and ZTA outperformed Al2O3 at the same stress missions. None of the ceramics yielded acceptable reliability at 800 MPa. A higher characteristic strength was observed for 3Y-TZP, followed by ZTA and Al2O3. While after aging ZTA and Al2O3 remained stable, 3Y-TZP exhibited a significant increase in the characteristic stress. Aging did not affect the reliability of ZTA and Al2O3. 3Y-TZP demonstrated an increase in monoclinic content and characteristic strength after aging.
AB - To evaluate the effect of fatigue and aging on the crystalline content and reliability of a zirconia-toughened-alumina (ZTA) composite compared to its individual counterpart materials (3Y-TZP and Al2O3). Thirty-six disc-shaped specimens per group were obtained to comply with ISO 6872:2015. Crystalline content, microstructure and reliability of experimental groups were evaluated in four stages: 1) immediate; 2) aged; 3) fatigued; 4) aged + fatigue. Aging was performed in autoclave and Step-Stress-Accelerated-Life-Testing (SSALT) was performed using three stress profiles. Weibull statistics were used to determine Weibull parameters and life-expectancy. A significant increase in monoclinic phase in 3Y-TZP was observed after aging (19.31%), fatigue (17.88%) and aging + fatigue (55.81%), while ZTA evidenced minimal variation among all conditions (<5.69%). 3Y-TZP presented higher reliability than ZTA at 300 and 500 MPa, and ZTA outperformed Al2O3 at the same stress missions. None of the ceramics yielded acceptable reliability at 800 MPa. A higher characteristic strength was observed for 3Y-TZP, followed by ZTA and Al2O3. While after aging ZTA and Al2O3 remained stable, 3Y-TZP exhibited a significant increase in the characteristic stress. Aging did not affect the reliability of ZTA and Al2O3. 3Y-TZP demonstrated an increase in monoclinic content and characteristic strength after aging.
KW - Aging
KW - Alumina
KW - Fatigue
KW - Microstructure
KW - Reliability
KW - Zirconia
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U2 - 10.1016/j.jmbbm.2022.105451
DO - 10.1016/j.jmbbm.2022.105451
M3 - Article
C2 - 36162164
AN - SCOPUS:85138415664
SN - 1751-6161
VL - 135
JO - Journal of the Mechanical Behavior of Biomedical Materials
JF - Journal of the Mechanical Behavior of Biomedical Materials
M1 - 105451
ER -