Mechanical Properties of Microcrystalline Glass

A special issue of Crystals (ISSN 2073-4352).

Deadline for manuscript submissions: 16 July 2025 | Viewed by 1187

Special Issue Editor

Department of Mechanics and Glasses, Univ Rennes, CNRS, IPR (Institut de Physique de Rennes)—UMR 6251, F-35000 Rennes, France
Interests: glass; glass-ceramic; MOF glass; mechanical properties; fracture toughness; SEPB

Special Issue Information

Dear Colleagues,

In the modern world, glass surrounds us at every moment, from the smartphones in our pockets to the enormous window panels of high-rise buildings. The urge for stronger, harder, stiffer, and tougher glass materials has led to the existence of crystalline glass, i.e., the existence of nano- or micro-crystals inside the glass matrix. Some crystalline glasses are transparent and have been used as screen covers for smartphones. Some crystalline glasses, on the other hand, are not transparent, such as the glass-ceramics that are used in the dental industry. Regardless, all crystalline glasses are known to exhibit superior mechanical performance compared to their regular glass counterparts. In this Special Issue, we would like to foster a collection of peer-reviewed scientific papers to contribute towards the understanding of the mechanical properties of crystalline glass. We are intrigued to discover whether there is a strong relationship between the crystal size and shape and the mechanical properties of crystalline glass, such as its hardness, elastic moduli, crack initiation resistance, crack propagation resistance, etc. It will also be englightening to elucidate whether an increase in the crystal percentage of the glass matrix would always result in the enhancement of such mechanical properties. Moreover, how do the crystals’ size, shape, and number effect the transparency of crystalline glass? Although crystalline glasses have been utilized for a long time, there is still room for more research to answer even basic questions in order to modernize their usage through the understanding of their mechanical properties. Hence, the present Special Issue on “Mechanical Properties of Microcrystalline Glass” may become a modern reference for both researchers and industries within this field.

Dr. Theany To
Guest Editor

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Keywords

  • mechanical properties
  • crystalline glass
  • glass
  • glass-ceramic
  • hardness
  • crack resistance
  • fracture toughness
  • X-ray diffraction
  • optical properties
  • theoretical models

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Published Papers (1 paper)

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Research

15 pages, 2177 KiB  
Article
Mechanical Behavior of Ion-Exchanged Alkali Aluminosilicate Glass Ceramics
by Bruno M. F. Nunes, André Dinis, Jorge C. Fernandes, Rui M. Almeida and Luís F. Santos
Crystals 2025, 15(1), 16; https://doi.org/10.3390/cryst15010016 - 26 Dec 2024
Viewed by 768
Abstract
Glass is one of the oldest and most versatile manmade materials and has been used for centuries. One of the areas of significant research and progress is that of high-mechanical-resistance glass. Several processes can be used to maximize the mechanical strength of glasses, [...] Read more.
Glass is one of the oldest and most versatile manmade materials and has been used for centuries. One of the areas of significant research and progress is that of high-mechanical-resistance glass. Several processes can be used to maximize the mechanical strength of glasses, namely thermal or chemical treatments. Glass ceramics, obtained through controlled crystallization, can enhance the mechanical properties of these materials and, as long as the crystals remain small enough, transparent glass ceramics can be obtained. On the other hand, ion exchange can strengthen the glass surface and reduce failure. As a result, ceramization followed by ion exchange can further enhance the mechanical characteristics of the parent glass. Aluminosilicate glasses and glass ceramics are known to present excellent transparency and chemical durability, plus good mechanical behavior; therefore, a lithium aluminosilicate glass composition was studied in order to obtain transparent glass ceramics, followed by an ion exchange process, and its mechanical properties were studied. Transparent glass ceramics were obtained, with an increase of ~15% in hardness over the parent glass. The glass ceramics were then subjected to an ion exchange treatment in a KNO3 bath, in order to further enhance the mechanical properties, without hindering the optical transmittance. The combination of heat treatment and chemical treatment resulted in a cumulative hardness increase of ~25%, from 620 ± 10 HV, for the as-cast glass and from 773 ± 23 HV for the ion-exchanged glass ceramic. Regarding the indentation fracture toughness, values obtained for the glass ceramics were similar to those obtained for the cast glass, yielding no noticeable change. Indentation fracture toughness increased after the ion exchange treatment of the glass ceramic, since a much higher load was necessary to obtain a measurable indentation, indicating higher indentation fracture strength. Full article
(This article belongs to the Special Issue Mechanical Properties of Microcrystalline Glass)
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