Insight into t-&gt;m transition of MW treated 3Y-PSZ ceramics by grazing incidence X-ray diffraction

Riva, Vincenzo; Boccaccini, Dino Norberto; Cannio, Maria; Maioli, Marco; Valle, Massimiliano; Romagnoli, Marcello; Mortalò, Cecilia; Leonelli, Cristina

doi:10.1016/j.jeurceramsoc.2021.09.054

Cited by 7 publications

(2 citation statements)

References 55 publications

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“…Thanks to this, the grains gain greater stability before the phase transition from the tetragonal phase to the monoclinic phase, making it possible to produce a material containing 100% of the tetragonal phase. Moreover, yttrium is the most effective additive because it provides high-quality bond strength to the veneering material [14].…”

Section: Introductionmentioning

confidence: 99%

Influence of Non-Invasive Zirconium Oxide Surface Treatment on Phase Changes

Regulska,

Januszewicz,

Jędrzejczak

et al. 2024

Ceramics

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The aim of the research was to find a zirconia treatment method that would reduce or minimize the transformation from the tetragonal phase to the monoclinic phase. Background: Yttria-stabilized zirconia is increasingly chosen for the base of permanent prosthetic restorations. To achieve a good bond between the prosthetic cup and the veneer material, the material must be treated to achieve surface development. This is a mechanical process, during which an unfavorable transformation from the tetragonal into the monoclinic phase takes place, which leads to the weakening of the internal structure of zirconium dioxide, and later damages the prosthetic restoration. Methods: The tested material consisted of cylindrical samples of 3Y-TZP CeramillZi zirconium oxide, which were sintered after cutting out from the block. After sintering, the samples were subjected to the following types of processing: laser structuring, chemical etching and plasma etching. After the surface treatments, the samples were subjected to diffraction tests to determine the phase composition. Next, the wettability was tested to determine the surface free energy. Results: On the basis of the conducted tests, it was noticed that the applied treatments caused a phase transformation from the tetragonal to the monoclinic phase. After the process of chemical etching, the range of the monoclinic phase for the sample was 5%; after plasma etching, it was 8%, and after laser structuring, it was 2%. In addition, post-surface free energy studies have shown that zirconia is wetted better with an apolar than a polar liquid. Conclusions: The obtained results indicate that the transformation was minimized with the treatments we applied; that is why they are called non-invasive methods. According to the literature data, depending on the parameters of the sandblasting process, the percentage of the monoclinic phase in the treated surfaces ranges from 22% to 52%, which confirms the above-mentioned conclusion.

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Section: Introductionmentioning

confidence: 99%

Influence of Non-Invasive Zirconium Oxide Surface Treatment on Phase Changes

Regulska,

Januszewicz,

Jędrzejczak

et al. 2024

Ceramics

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“…Porous structures with the highest pore volume-to-surface area ratio possible and with better mechanical properties (limited notch-features) were selected to investigate the influence of porosity on mechanical properties of 3YSZ. The tetragonal-monoclinic transition in 3YSZ was determined by micro-Raman spectroscopy [31,32]. The aim of the work was to investigate the influence of porosity on the mechanical properties of 3YSZ with different values of open porosity prepared by tape-casting.…”

Section: Introductionmentioning

confidence: 99%

Influence of Porosity on R-Curve Behaviour of Tetragonal Stabilized Zirconia

Boccaccini¹,

Gil

Gurauskis

et al. 2022

Ceramics

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Y2O3 at 3% mol partially stabilized Zr2O3 (3YSZ) porous specimens with variable open porosity, from fully dense up to ~47%, and their potential use as anode supports for new solid oxide cell designs were fabricated by tape casting. The stiffness, strength and fracture properties were measured to investigate the influence of porosity on mechanical properties. The evolution of Young’s modulus and characteristic strength was evaluated by ball-on-ring tests. The variation of critical plane stress Mode I stress intensity factor with porosity has also been investigated and modelled from the results obtained from fracture mechanics testing. R-curve behaviour was observed in dense 3YSZ specimens and in porous 3YSZ compositions. The width of the transformation zone after fracture mechanics testing and the variation with porosity were investigated. The phases existing in the fracture zone were determined and quantified by Raman spectroscopy. It was found that the width of the transformation zone increased with increasing porosity. A new general R-curve model for 3YSZ based on the McMeeking–Evans equation is presented, which can be used to predict the behaviour of the R-curve as a function of porosity, simply by knowing the properties of the dense material and introducing in this equation porosity-dependent laws on the key properties that affect fracture toughness.

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Facile and Effective Method for the Preparation of Sodium Alginate/TiO₂ Bio‐Composite Films for Different Applications

Paradisi,

Mortalò,

Russo

et al. 2024

Macromolecular Symposia

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Nanocomposites of sodium alginate (SA) and TiO2 nanoparticles have gained attention in the last decade for their versatile uses in several applications. Indeed, TiO2 is particularly appealing for its photocatalytic and antimicrobial activity and inherent safety. In this paper, TiO2 nanoparticles are successfully embedded, synthesized by a microwave‐assisted method, into SA matrix by a simple solvent casting method to form flexible and self‐consistent SA/TiO2 films. FT‐IR, XRD, and contact angle measurements confirm the formation of homogeneous and hydrophilic bio‐composites films that may be suitable for packaging or life science applications.

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Insight into t->m transition of MW treated 3Y-PSZ ceramics by grazing incidence X-ray diffraction

Cited by 7 publications

References 55 publications

Influence of Non-Invasive Zirconium Oxide Surface Treatment on Phase Changes

Influence of Non-Invasive Zirconium Oxide Surface Treatment on Phase Changes

Influence of Porosity on R-Curve Behaviour of Tetragonal Stabilized Zirconia

Facile and Effective Method for the Preparation of Sodium Alginate/TiO₂ Bio‐Composite Films for Different Applications

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Insight into t->m transition of MW treated 3Y-PSZ ceramics by grazing incidence X-ray diffraction

Cited by 7 publications

References 55 publications

Influence of Non-Invasive Zirconium Oxide Surface Treatment on Phase Changes

Influence of Non-Invasive Zirconium Oxide Surface Treatment on Phase Changes

Influence of Porosity on R-Curve Behaviour of Tetragonal Stabilized Zirconia

Facile and Effective Method for the Preparation of Sodium Alginate/TiO2 Bio‐Composite Films for Different Applications

Contact Info

Product

Resources

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Facile and Effective Method for the Preparation of Sodium Alginate/TiO₂ Bio‐Composite Films for Different Applications