Glass-ceramics have a characteristic manufacturing process and a unique set of properties. Combining the best aspects of glass and ceramic, they represent a new class of materials. The coefficient of thermal expansion (CTE) of lithium-aluminum-silicate (LAS) glass-ceramics can be tailored to nearly zero.Web
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An overview of the formation of calcium phosphate under in vitro environment on the surface of a range of bioactive materials (e.g. from silicate, borate, and phosphate glasses, glass-ceramics, bioceramics to metals) based on recent literature is …Web
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In this study, three different mixtures including natural volcanic rock basalt, waste window glass, and Na2CO3 were developed as sealants for using solid oxide fuel cell (SOFC). The mixtures were melted at 1500 °C and cast into the water and graphite mold. The bulk glass parts were used in dilatometer analysis to determine the coefficient of …Web
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Souza M, Peñarrieta-Juanito G, Henriques B, Silva F, Novaes de Oliveira A and Souza J (2018) Lithium-zirconium silicate glass-ceramics for restorative dentistry: Physicochemical analysis and …Web
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Silicate Glass. The silicate glass 45S5 structure can be best visualized as a three-dimensional (3D) SiO2 network with a central silicon ion surrounded by four …Web
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Among different silicate systems, CaO−MgO−SiO 2 is the one of the most promising due to abundance of reagents, easier fabrication, improved performance, and wide range of application. Analysis of the current literature sources denotes that phase diagram of CaO−MgO−SiO 2 system is regularly used by researchers worldwide as …Web
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This work investigates possible correlations between the level of translucency and resistance to wear (in vitro) under sliding contact against hard zirconia antagonists in commercial lithium disilicate and zirconia-reinforced lithium silicate dental glass-ceramics. Wear rates are quantified, and mechanisms responsible for material …Web
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Methods: Blocks of a lithium silicate glass-ceramic (Obsidian®, Glidewell Laboratories) were cut into 1 mm thick plates and polished to 1 μm finish. Some of them were crystallized prior to polishing. Firstly, ex situ compositional and microstructural characterizations of both the pre- and post-crystallized samples were performed by wavelength ...Web
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This chapter introduces the reader into the "mystery of glass", providing a picture of the structural theories, formation criteria and main processing methods for …Web
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Lithium aluminum silicate (LAS) glass-ceramics constitute the second largest Li-based industry (14%) after batteries (USGS, 2021). The LAS glass-ceramics have various industrial applications such as in cooktops, glassware, fireproof glass, and reflecting telescopes, owing to their specific characteristics, such as extremely low …Web
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Self-reinforced lithium disilicate (Li 2 Si 2 O 5, LD) glass-ceramics were hot pressing sintered by introducing 5 wt% Li 2 Si 2 O 5 crystal seeds into two different glass …Web
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K 0.5 Na 0.5 NbO 3 (KNN) based ceramics are considered optimal candidates to replace the toxic Pb-based piezoelectric materials; nonetheless, they are quite difficult to process. Therefore, obtaining an efficient glass-ceramic (GC) will have several advantages in lead-free piezoelectric production. The first step to developing …Web
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The aim of this study was to evaluate the effect of two finishing techniques, glazing or polishing, in comparison with the as-cut condition, on the biaxial-flexural …Web
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Since glass–ceramics started to be used in dentistry, materials with varied compositions have been developed. Table 1 lists three of the commercially available …Web
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A new transparent zinc silicate glass-ceramic was derived from the 55ZnO–5B2O3–40SLS glass system via a controlled heat-treatment method. The precursor glass sample was placed through the heat-treatment process at different temperatures to study the progress in phase transformation, optical performance and emission intensity of the zinc silicate …Web
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This chapter introduces the reader into the "mystery of glass", providing a picture of the structural theories, formation criteria and main processing methods for glass and glass–ceramic products with focus on a selected set of silicate materials..Web
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Hence, the MnO2 acts as a structural network modifier of calcium silicate glass–ceramics. Furthermore, the estimated values of the Lande g-factor (2.01534–2.01731) for the d5 system of the Mn2+ displayed a negative shift from the free electron (2.0023), and the hyperfine splitting constant A value was 87 × 10−4 cm−1, …Web
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Detailed discussions are provided on the following areas: LAS matrix composites, chemical strengthening of glass and glass-ceramic, low temperature co-fired ceramics (LTCC) …Web
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However, due to the impurity phase present in devitrified GC containing silicate crystalline phases, the QY is much lower than that of glass-ceramics containing YAG crystallites. For example, the QY of glass-ceramics with M 2 MgSi 2 O 7 :Eu 2+ (M = Ca, Sr) nanocrystals reported by S.Tanabe et al. were only 14% [ 57 ].Web
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The crystallization of β-eucryptite and β-spodumene phases in glass-ceramic materials in the Li 2 O-SiO 2-Al 2 O 3 glass system reduced the quantity of lithium silicate crystals [20, 21] .The spodumene phase formed in the glass Li 2 O could react with the same amount of Al 2 O 3 and twice of SiO 2 to form eucryptite phase as shown in Eq. (4).Web
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Lithium aluminum silicate (LAS) glass-ceramic exhibits high transmittance to electromagnetic wave and is an ideal radome material. LAS glass-ceramics with different ratios of Li/Al were prepared by sol-gel method. Crystallization behaviors and wave-transparent properties of sintered powders were characterized.Web
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Different polymorphs of the barium silicate glass are considered: 1BaO·2SiO 2, 3BaO·5SiO 2, 5BaO·8SiO 2, and ... G. H. Applications of Glass-Ceramics, in Glass-Ceramic Technology (Wiley ...Web
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Broadband and tunable near-infrared (NIR) emission of Ni2+ doped glass–ceramics (GCs) is highly attractive due to their potential to address the challenge of broadband optical amplification in the optical communication band. However, optical activity of Ni2+ in different glass matrix as well as nucleation and crystallization processes in …Web
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The present issue on "Transparent Glass Ceramics" has included articles on the absorption library of rare-earth orthophosphates, the crystallization of GeO 2-Al 2 O 3-Bi 2 O 3 glasses, and the luminescence behavior of GdVO 4: Tb nanocrystals in silicate glass ceramics. We believe these articles will be useful for the materials community in ...Web
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Glass-Ceramic. Glass-ceramics have a characteristic manufacturing process and a unique set of properties. Combining the best aspects of glass and ceramic, they represent a …Web
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Detailed discussions are provided on the following areas: LAS matrix composites, chemical strengthening of glass and glass-ceramic, low temperature co-fired ceramics (LTCC) and associated joining technologies (hydrolysis catalysis bonding, anodic bonding, brazing, etc.) that would further extend the application portfolio of LAS system. ...Web
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Zinc ion-containing glass–ceramic glazes are one of the most difficult and time-consuming techniques of decorating ceramics. The main problem is that the glaze ingredients should be selected in such a way that zinc silicate-willemite crystals (Zn 2 SiO 4 ) are formed in a long and quite complicated process of firing.Web
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Silicate glass-ceramics include those based on lithium metasilicate (Li 2 SiO 3), lithium disilicate (Li 2 Si 2 O 5), diopside (CaMgSi 2 O 6), enstatite (MgSiO 3), and wollastonite …Web
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These can be broadly classified as silicate glass (Bio glass or 45S5 bioactive glass), glass ceramics (Bon Alive or S53P4 bioactive glass), and silica-based glasses such as 13-93 and 13-93B1, ... A fully crystallized bioactive glass-ceramic has been proposed to treat DH by depositing hydroxyl carbonate apatite in open dentinal tubules . …Web
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Obsidian ® All-Ceramic. Monolithic composition that's resistant to chipping. Ideal combination of esthetics and high flexural strength. Ideal for single crowns, 3-unit anterior bridges, veneers, inlays and onlays. LEARN MORE. Obsidian® lithium silicate ceramic is a glass ceramic material indicated for fabrication of full-contour crowns ...Web
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Optical glass fibers can propagate light signals, while their control depends on nonlinear optical crystals. In this study, we fabricated nonlinear optical glass-ceramic (GC) fibers in which the polar fresnoite phase was crystallized based on perfect surface crystallization (PSC) in the SrO–TiO 2 –SiO 2 system. GC fibers free from voids were …Web
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These new glass-ceramics contain lithium silicate as the main crystalline phase in a vitreous matrix reinforced with zirconium dioxide crystals (~10%). The lithium silicate crystals have a size from 500 up to 1000 nm and up to 6 times smaller than lithium disilicate crystals present in lithium disilicate glass-ceramics. Zirconia particles act ...Web
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An important line in modern materials science is the creation of new high-temperature glass-ceramic composite materials (CM). These include materials in which the dominant crystalline phases are silicates and aluminosilicates — mullite, cordierite, strontium and barium aluminosilicates, forsterite, and yttrium silicates [].The chemical and phase …Web
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Materials 2022, 15, 8099 3 of 4 Structural and photoluminescence investigations of silicate glass-ceramics with CaF2 nanocrystals co-doped with Tb3+/Eu3+ ions are described by Pawlik et al. [22]. The series of glass-ceramics with CaF2 nanocrystals were fabricated using the sol–gel method, which is a suitable alternative for …Web
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