Processing and characterization of Ca-TZP nanoceramics

Łabuz, A.; Lach, Radosław; Rączka, Marian; Wójtowicz, Bartosz; Pyda, W.

doi:10.1016/j.jeurceramsoc.2015.06.022

Cited by 20 publications

(8 citation statements)

References 23 publications

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“…7 This gives birth to microcracks and failure in the sintered zirconia ceramics and also makes pure, undoped zirconia (in monoclinic form) an unsuitable candidate for engineering applications. To overcome these undesired properties, generally, some amount of metal oxide stabilizers like yttria (Y 2 O 3 ), 11 calcia (CaO), 19 magnesia (MgO), 20 ceria (CeO 2 ) 21 etc. with different crystal structures (along with comparatively high solubility) in zirconia are doped.…”

Section: Introductionmentioning

confidence: 99%

“…Some recent works in this direction involves stabilizing zirconia matrix with other dopants (e.g., alkaline earth metal ions) in low amounts (<5 mol%). 19 Usually for CaO-doped zirconia ceramics, PSZ (with majorly tetragonal phase) and cubic phases have been obtained at 8-9 mol% 31 and 15-16 mol% 32 CaO doping, respectively. TZP ceramics 33,34 have been found suitable for clinical applications; the properties like high fracture toughness, strength, resistance to wear and biocompatibility (compare to the FSZ grade) aid such causes.…”

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confidence: 99%

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Structure‐property relations for a phase‐pure, nanograined tetragonal zirconia ceramic stabilized with minimum CaO doping

2021

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Zirconia (ZrO 2 )-based ceramics have dominated the engineering ceramics market for ages due to its diverse properties, for example, high strength, 1 notable hardness and toughness, 1,2 promising wear resistance, 3 bio-inertness, 4 high ionic conductivity, 5 modest coefficient of thermal expansion, 6 and elastic modulus similar to steel 7 (zirconia is also known as "ceramic steel" 7,8 ). High ionic conductivity in intermediate temperature makes the doped zirconia ceramics relevant for solid oxide fuel cell applications (as an electrolyte). 9,10 For biomedical applications, viz., in dentistry (for crown and bridge) 11 and prosthetic industry (as the ball heads for hip replacements), 12 ZrO 2 -based ceramics find its relevance due to its nontoxicity and mechanical integrity. For structural applications, zirconia-based ceramics are mostly used as cutting tools. 13 The other applications of zirconia involve fields like gas sensors, 14,15 refractories, 16 structural opacifiers, 17 and thermal barrier coating (TBC) 18 etc.Pure zirconia 5 has three crystalline polymorphic forms, namely monoclinic, tetragonal, and cubic. Among these polymorphs, monoclinic phase is stable at room temperature. At high temperature (>1170°C), there is a prominent volume expansion (~4%) associated with the tetragonal to monoclinic phase transformation (in zirconia bodies) during cooling. 7 This gives birth to microcracks and failure in the sintered zirconia ceramics and also makes pure, undoped zirconia (in monoclinic form) an unsuitable candidate for engineering applications. To overcome these undesired properties, generally, some amount of metal oxide stabilizers like yttria (Y 2 O 3 ), 11 calcia (CaO), 19 magnesia (MgO), 20 ceria (CeO 2 ) 21 etc. with different crystal structures (along with comparatively high solubility) in zirconia are doped. Doping stabilizes the high-temperature polymorphs, that is, tetragonal and cubic phases at ambient conditions. Doping of cations inside zirconia matrix results in decrease in particle/crystallite size, which ultimately stabilizes tetragonal structure of zirconia nanoparticles/ceramics. [22][23][24] Partially stabilized zirconia

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

Structure‐property relations for a phase‐pure, nanograined tetragonal zirconia ceramic stabilized with minimum CaO doping

2021

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“…Fabrication of Ca‐TZP with fracture toughness of about 13 MPa·m 0.5 and hardness of 11 GPa, comparable with that of Y‐TZP, by high‐energy milling of baddeleyite was recently reported . Furthermore, preparation of nanocrystalline Ca‐TZP ceramics with bending strength of 730 MPa was recently reported by Labuz et al., however, no rigorous studies of aging of these ceramics were published. Thus, study of LTD resistance of these Ca‐TZP ceramics may be interesting for better understanding of LTD features in Ca‐TZP and of no little importance when estimating possible applications of these ceramics.…”

Section: Introductionmentioning

confidence: 99%

Low‐temperature aging of baddeleyite‐based Ca‐TZP ceramics

et al. 2017

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The aging kinetics during low‐temperature aging of calcia‐stabilized tetragonal zirconia polycrystal (Ca‐TZP) ceramics prepared by high‐energy milling of natural zirconia mineral (baddeleyite) was studied by X‐ray diffraction under hydrothermal treatment conditions. Aging kinetics was investigated for ceramics with different contents of calcia. It was found that the kinetics may be well‐described within Johnson‐Mehl‐Avrami‐Kolmogorov model. Model parameters were determined by data fitting procedure. Change in exponential factor within Johnson‐Mehl‐Avrami‐Kolmogorov model with time is shown. Analytical model to describe aging kinetics is proposed. The transformation nucleation rate, initial diameter, and depth of the transformed areas and their growth rates are estimated. Degradation of hardness and fracture toughness is also reported for Ca‐TZP after low‐temperature aging for different contents of the stabilizer.

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“…dopadas com óxido de cálcio representam um grande avanço na redução do efeito do envelhecimento, a precipitação simultânea de cloreto de zirconil com amônia e adição de hidróxido de cálcio na quantidade de 4% em mol, obtém uma nanocerâmica de zircônia tetragonal policristalina dopada com cálcio (4Ca-TZP; 4% mol CaO-TZP), e os resultados obtidos demonstraram redução sobre o efeito da degradação por envelhecimento não obtendo a fase monoclínica mesmo após envelhecimento acelerado em autoclave a 134 o C durante 5 horas, comprovada pela difratometria de raios-X(ŁABUZ et al, 2015).Outra possibilidade de redução das vacâncias de oxigênio e consequentemente redução do efeito do envelhecimento é a adição de elementos tetravalente como por exemplo o cério (Ce +4 ). A adição de óxido de cério (IV) ou CeO2 atua diretamente no aumento da tenacidade à fratura atingindo valores de até 14 MPa.m 1/2 , contudo ocorre a redução da resistência à flexão biaxial para 700 MPa, para uma adição de 10,5% em mol de óxido de cério ocorre um aumento da resistência em flexão biaxial para 1200 MPa, mas ocorre redução da tenacidade para 10 MPa.m 1/2 , portanto, na ciência dos materiais cerâmicos, ainda é um desafio encontrar materiais com elevada tenacidade à fratura que mantenham a resistência à flexão biaxial(CHEVALIER et al, 2019) e que atuem reduzindo o efeito da LTD.…”

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