Physical-Mechanical Behaviour of a LZS Glass-Ceramic

Teixeira, Jaime Domingos; Pereira, Manuel Alfredo; Boehs, Lourival; Siligardi, Cristina; Cantavella, V.; Oliveira, Antônio Pedro Novaes de

doi:10.4028/www.scientific.net/msf.775-776.599

Cited by 6 publications

(1 citation statement)

References 5 publications

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“…In summary, inspired by the excellent mechanical performance induced by ZrO 2 in many ceramic systems, researchers have also been putting large efforts into bringing ZrO 2 phase to glass‐ceramics. In practice, it can be accomplished through internal crystallization of a ZrO 2 phase in glass‐ceramics 96–99 or by sintering and crystallization of pressed mixtures of glass and ZrO 2 powder 100–103 . However, except for a few aforementioned simple systems in which the ZrO 2 phase transformation toughening mechanism was accredited for the observed fracture toughness enhancement, no reliably convincing evidence on phase transformation toughening has been reported in other glass‐ceramics systems 97,98,100,103 .…”

Section: Effect Of Zro2 On Mechanical Propertiesmentioning

confidence: 99%

Zirconia‐containing glass‐ceramics: From nucleating agent to primary crystalline phase

Shearer,

Montazerian,

Deng

et al. 2024

Int J Ceramic Engine & Sci

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This article reviews promising studies on the design, manufacturing, microstructure, properties, and applications of glass‐ceramics containing ZrO2 and relevant glass‐ceramic matrix composites. After the addition of ZrO2 to a glass‐ceramic composition, it can persist in the residual glassy phase, facilitate nucleation, and/or precipitate as ZrO2 or another zirconate crystalline phase. Also, ZrO2‐reinforced or ZrO2‐toughened glass‐ceramics can be designed as composites. In this article, the term “ZrO2‐containing glass‐ceramics” encompasses all these scenarios in which ZrO2 is present. Such glass‐ceramics offer a wide range of applications in modern industries, including but not limited to architecture, optics, dentistry, medicine, and energy. Since S. Donald Stookey's discovery of glass‐ceramics in the early 1950s, the most important scientific efforts reported in the literature are reviewed. ZrO2 is commonly added to glass‐ceramics to promote nucleation. As a result, the role of ZrO2 in structural modification of residual glass and stimulating the nucleation in glass‐ceramic is first discussed. ZrO2 can also be designed into the main crystalline phase of glass‐ceramics, contributing achieving super high fracture toughness above 4 MPa·m0.5. Experimental and computational studies are reviewed in detail to elucidate how the transformation toughening and other mechanisms help to achieve such high values of fracture toughness. Sintered and glass‐ceramic matrix composites also show promise, where ZrO2 contributes to improved stability and mechanical properties. Finally, we hope this article will provoke interest in glass‐ceramic materials in both the scientific and industrial communities so that their tremendous technological potential in developing, for example, tough, thermally stable, transparent, and biologically compatible materials can be realized more widely.

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Section: Effect Of Zro2 On Mechanical Propertiesmentioning

confidence: 99%

Zirconia‐containing glass‐ceramics: From nucleating agent to primary crystalline phase

Shearer,

Montazerian,

Deng

et al. 2024

Int J Ceramic Engine & Sci

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Properties of LZS/nanoAl2O3 glass-ceramic composites

Arcaro

Moreno

Chinarro

et al. 2017

Journal of Alloys and Compounds

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The Li 2 O•11.10ZrO 2 •69.32SiO 2 ) have a high coefficient thermal expansion (CTE) which can be a limitation in some applications. The addition of alumina in a LZS glass-ceramic matrix is able to reduce the CTE significantly. This happens because of the alumina affinity with respect to lithium silicates to form β-spodumene (LiAlSi 2 O 6 ), a crystalline phase having a CTE nearly zero (0.9 x 10 -6 o C -1 ). In this work, (1-5 vol.%) Al 2 O 3 nanoparticles (13 nm) were added to a LZS (3.5 µm) glass-ceramic matrix to prepare composites with the main goal of evaluation the influence of Al 2 O 3 on their mechanical, thermal and electrical properties. Each composition was wet homogenized and then dried at 110 °C for 48 h for d isaggregation. The composites, sintered at 900 ºC for 30 min, with relative densities between 92% and 98%, showed zircon and β-spodumene as main crystalline phases. The incorporation of increasing additions of nanosized alumina progressively decreases the final density. This makes the properties to slightly decrease, also. The Young's modulus significantly decreases from 111 to 78 GPa of hardness due to the exponential variation with porosity, but the changes of toughness and hardness are much lower. The electrical conductivity was maintained within ± 10-7 S•cm-1, and the dielectric constant ranged from 5 and 6 for all compositions. Thermal conductivity ranged around 4.2 to 3.5 W/mK.

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