Wear and fracture toughness of partially stabilized zirconia ceramics under dry friction against steel

Akimov, G. Ya.; Chaika, E. V.; Marinin, G. A.

doi:10.3103/s1068366609020019

Cited by 6 publications

(4 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Generally, the improvement in interfacial adhesion stability of a film could be related to better interactions between coated layers and substrate. It is confirmed that adding SiO2, Fe2O3, and GO to TiO2 thin films could improve adhesion [76][77][78][79][80][81][82][83]. Moreover, it is widely accepted that the presence of the cracks can have a negative impact on photoactivity and wettability properties, and so crack-free coated films are highly appreciated.…”

Section: Monitoring Self-cleaning Properties Through Photoactivity Vamentioning

confidence: 93%

“…Crack connections may also promote the formation of large dense domains, helping light scattering and reducing light harvesting. Conversely, a dense structure limits the electron path transport toward the substrate, which reduces the probability of the recombination process to occur [83,88]. The balance between all abovementioned phenomena contribute to obtain lower efficiency in the TSF 63 film, and better efficiency in the dense, crack-free TSF 32 G 1 and TSF 32 G 2 coated films.…”

Section: Monitoring Self-cleaning Properties Through Photoactivity Vamentioning

confidence: 99%

See 1 more Smart Citation

On the Role of γ-Fe2O3 Nanoparticles and Reduced Graphene Oxide Nanosheets in Enhancing Self-Cleaning Properties of Composite TiO2 for Cultural Heritage Protection

et al. 2020

View full text Add to dashboard Cite

The durability of novel metallic artifacts and buildings is an open issue, and the role of smart protecting coatings in extending these artifacts’ lifetimes is crucial. In this paper, the role of γ-Fe2O3 nanoparticles and reduced graphene oxide (rGO) nanosheets on enhancing the self-cleaning properties of composite TiO2 films and reducing metal alterations due to contact with acid rain and pollutants is investigated. The photocatalytic assessment of the TiO2 based films indicates that there are optimum contents for γ-Fe2O3 and rGO, which confer the film lower bandgap and tune the TiO2 anatase/rutile ratio. By adding a proper content of γ-Fe2O3, wettability is reduced both in dark and under illumination, which could be related to higher roughness. γ-Fe2O3 overloading causes increasing crack density and eventually a fully cracked structure. Adding an appropriate amount of rGO causes a sharp increase in roughness, due to the stacking of rGO nanosheets, while simultaneously avoiding cracking. At higher contents of rGO, wettability further decreases due to higher amounts of hydroxyl groups bound onto rGO; also in this case, overloading causes film cracking. Evaluation of self-cleaning performance and discoloration resistance under soiling and acid rain simulated tests demonstrates that proper loadings of γ-Fe2O3 and rGO present higher efficiency thanks to higher superhydrophilic tendency and higher photocatalytic activities, as well as an efficient barrier effect.

show abstract

Section: Monitoring Self-cleaning Properties Through Photoactivity Vamentioning

confidence: 93%

Section: Monitoring Self-cleaning Properties Through Photoactivity Vamentioning

confidence: 99%

On the Role of γ-Fe2O3 Nanoparticles and Reduced Graphene Oxide Nanosheets in Enhancing Self-Cleaning Properties of Composite TiO2 for Cultural Heritage Protection

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Zirconia-based ceramic materials are of great interest because of their unique properties, which make them suitable for many different uses. The high hardness, toughness, wear resistance, strength, chemical inertness, low thermal conductivity, excellent corrosion resistance and high melting temperature (Hannink et al, 2000;Tsalouchou et al, 2008;Judes & Kamaraj, 2009;Akimov et al, 2009;Yang et al, 2005;Trunec & Chlup, 2009) allow the exploitation of ZrO 2 in the production of thermal barrier coatings (Ballard et al, 2003;Gao et al, 2011;Ilavsky et al, 2001;Park et al, 2005;Chambers & Clarke, 2006), dental restorative materials (Tsalouchou et al, 2008;Zhang, 2012), heterogeneous catalysts (Mercera et al, 1991;Sayama & Arakawa, 1993;Chen et al, 2001;Reddy et al, 2006), solid-state oxide fuel cells (SOFCs; Luo et al, 2004;Shao et al, 2012), optical fiber ferrules (Yang et al, 2005;Kim & Hwang, 2011;Yang et al, 2001), and gas sensors (Zhuiykov et al, 2002;Miura, 2000;Kharton et al, 2004;Izu et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Determining europium compositional fluctuations in partially stabilized zirconia nanopowders: a non-line-broadening-based method

Marin

Sponchia

Back

et al. 2016

Acta Crystallogr Sect B

View full text Add to dashboard Cite

A method is reported for assessing the compositional fluctuations in a ceramic sample, based only on the determination of the crystalline lattice parameters. Pure tetragonal phase partially stabilized zirconia powders are synthesized through the co-precipitation method by incorporating 4% Eu(3+). The powder is subjected to compression cycles to promote the tetragonal-to-monoclinic transformation. The Rietveld analysis of the X-ray powder diffraction patterns, recorded after each compression cycle, gives information about the lattice parameters and monoclinic phase content. The determination of europium content in the residual tetragonal phase is accomplished considering the unit cell volume of t-ZrO2 using Vegard's law. Using this information the compositional fluctuations over the sample were determined by considering two possible distributions of lanthanide ion content in the powders: a Gaussian and a Log-normal one. It was found that the Gaussian distribution better fits the experimental data. It was eventually demonstrated that these results are physically meaningful.

show abstract

“…Since the pioneering discovery of the mechanism for its transformation toughening by Garvie in 1975, zirconia has become one of the most important structural and engineering ceramic materials . It shows excellent intrinsic physical and chemical properties, which include hardness, strength, toughness, wear resistance, chemical inertness, low thermal conductivity, excellent corrosion resistance, and high melting temperature (2715°C) . Zirconium oxide crystallizes in three polymorphs: the thermodynamically favored monoclinic phase ( m ) which is stable up to 1170°C, the tetragonal ( t ) phase which is conserved until 2370°C, when cubic ( c ) phase appears .…”

Section: Introductionmentioning

confidence: 99%

Monitoring the t → m Martensitic Phase Transformation by Photoluminescence Emission in Eu³⁺‐Doped Zirconia Powders

et al. 2013

View full text Add to dashboard Cite

In this work, we demonstrate that the martensitic t ? m phase transformation of ZrO 2 powder stabilized with Eu 3+ and Eu 3+ / Y 3+ ions, can be effectively monitored by photoluminescence (PL) spectroscopy. As the luminescent properties of Eu 3+ from within a host lattice are strongly influenced by the coordination geometry of the ion, we used the emission spectrum to monitor structural changes of ZrO 2 . We synthesized Eu 3+ -doped and Eu 3+ /Y 3+ -codoped samples via the coprecipitation method, followed by calcination. We promoted the martensitic transformation by applying mechanical compression cycles with an increasing pressure, and deduced the consequential structural changes from the relative intensities of the 5 D 0 ? 7 F 2 hypersensitive transitions, centered, respectively, at 606 and 613 nm whether the Eu 3+ is in the eightfold coordinated site of the tetragonal phase or in the sevenfold coordinated site of the monoclinic phase. We suggest that the unique emission profile for Eu 3+ ions in different symmetry sites can be exploited as a simple analytical tool for remote testing of mechanical components that are already mounted and in use. The structural changes observed by PL spectroscopy were corroborated by Xray powder diffraction (XRPD), with the phase compositions and volume fractions being determined by Rietveld analysis.

show abstract

Wear and fracture toughness of partially stabilized zirconia ceramics under dry friction against steel

Cited by 6 publications

References 5 publications

On the Role of γ-Fe2O3 Nanoparticles and Reduced Graphene Oxide Nanosheets in Enhancing Self-Cleaning Properties of Composite TiO2 for Cultural Heritage Protection

On the Role of γ-Fe2O3 Nanoparticles and Reduced Graphene Oxide Nanosheets in Enhancing Self-Cleaning Properties of Composite TiO2 for Cultural Heritage Protection

Determining europium compositional fluctuations in partially stabilized zirconia nanopowders: a non-line-broadening-based method

Monitoring the t → m Martensitic Phase Transformation by Photoluminescence Emission in Eu³⁺‐Doped Zirconia Powders

Contact Info

Product

Resources

About

Wear and fracture toughness of partially stabilized zirconia ceramics under dry friction against steel

Cited by 6 publications

References 5 publications

On the Role of γ-Fe2O3 Nanoparticles and Reduced Graphene Oxide Nanosheets in Enhancing Self-Cleaning Properties of Composite TiO2 for Cultural Heritage Protection

On the Role of γ-Fe2O3 Nanoparticles and Reduced Graphene Oxide Nanosheets in Enhancing Self-Cleaning Properties of Composite TiO2 for Cultural Heritage Protection

Determining europium compositional fluctuations in partially stabilized zirconia nanopowders: a non-line-broadening-based method

Monitoring the t → m Martensitic Phase Transformation by Photoluminescence Emission in Eu3+‐Doped Zirconia Powders

Contact Info

Product

Resources

About

Monitoring the t → m Martensitic Phase Transformation by Photoluminescence Emission in Eu³⁺‐Doped Zirconia Powders