Negative thermal expansion in porous glass-ceramics based on Mg2Al2B2Si5O18 prepared from Saudi raw materials

Eldera, Samah S.; Al-Wafi, Reem; Harbi, Omar A. Al; Rüssel, Christian; Hamzawy, Esmat M. A.

doi:10.1007/s12206-020-1017-3

Cited by 4 publications

(4 citation statements)

References 34 publications

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“…In the present work, low and -ve CTE cordierite containing sintered ceramic or glass may be due to either the change in c-axis or the cracks either due to change in CTE of the developed phases or the developed pores [30]. In general, the CTE was higher in sintered ceramic compared to those in the sintered glasses which may be due to the presence of remnants particles of minerals coexist with cordierite which may have high CTE [28].…”

Section: Physical Properties Of Sintered Glasses and Ceramicsmentioning

confidence: 48%

“…In the bulk cordierite ceramic, the authors attributed the change in CTE value to the formation of multi-crystalline phases with cordierite such as quartz and cristobalite which causes microcracking due to the changes in the CTE of the developed crystalline phases with cordierite [29]. Lately, the porous sintered 2MgO•2Al2O3•2B2O3• 5SiO2 glass gave low andve CTE [30].…”

Section: Physical Properties Of Sintered Glasses and Ceramicsmentioning

confidence: 99%

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Cordierite ceramic through glass and ceramic routes from kaolin and talc

et al. 2021

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Based on kaolin and talc, cordierite was prepared through melt quench and ceramic process of two compositions. The sintering process of ceramics between 1000 and 1300 °C shows mainly the manifestation of cordierite with little ratios of spinel, enstatite, mullite and cristobalite. However, the sintering of their corresponding glasses between 1100 °C and 1200 °C shows the crystallization of cordierite as the main phase with little cristobalite and spinel. In microstructure, the sintering of the ceramic samples revealed nano size rounded-or rod-crystals either free or in clusters in glassy matrix. Whereas, sintering of the corresponding glasses showed clear euhedral to subhedral tetragonal to hexagonal crystals in submicron scale that spread in the residual glassy matrix. The density of the sintered ceramic samples was in the range of 1.96 and 2.43 g/cm 3 corresponding to porosity of 29.34 and 5.46 % respectively. While the density of the sintered glasses was 1.90 and 2.35 gm/cm 3 , corresponding to porosity of 36.20 and 3.30 % respectively. The sintered glass samples presented low and negative coefficient of thermal expansion (CTE) of 36.1 and -36.1 × 10 -. °C -1 (in the range ~ 24 -500 and 700 °C). The microhardness values were between 468 and 577 Kg/mm 2 . As a result, the prepared cordierite ceramic may be possibly used as refractoriness in electric heater supports, such as electric stove or heater cooling plate and ceramic heater base.

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Section: Physical Properties Of Sintered Glasses and Ceramicsmentioning

confidence: 48%

Section: Physical Properties Of Sintered Glasses and Ceramicsmentioning

confidence: 99%

Cordierite ceramic through glass and ceramic routes from kaolin and talc

et al. 2021

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“…Nandi [81] reported doping boron in cordierite to exhibit negative CTE in the temperature range 100-300°C and attributed this behaviour to the boron filling vacant lattice channels. Recently, Eldera et al [82] [84]. They can be easily crystallised from silicate glass and can enjoy glass-ceramic processing route that is suitable for volume productions.…”

Section: Low Thermal Expansion Glass Ceramicsmentioning

confidence: 99%

“…Recently, Eldera et al . [82] prepared a porous Mg 2 Al 2 B 2 Si 5 O 18 glass-ceramic with CTE between –3.26 and –2.27 × 10 –6 °C –1 from room temperature up to 300°C. It was prepared by replacing Al 2 O 3 by B 2 O 3 in Cordierite composition.…”

Section: Low Thermal Expansion Glass Ceramicsmentioning

confidence: 99%

Lithium aluminosilicate (LAS) glass-ceramics: a review of recent progress

Venkateswaran

Sreemoolanadhan

Vaish

2021

International Materials Reviews

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The lithium aluminosilicate system (LAS) is being explored for almost seven decades due to its anomalous and attractive properties (especially low/negative thermal expansion and fast ion conduction) and its commercial significance in consumer as well as strategic sectors. This review introduces current commercial applications of LAS systems, necessary background science, structural features of different LAS crystal systems, including their polymorphs and solid-solutions, and the origin of unusual properties. Significant emphasis is provided on processing transparent, nanocrystalline, low thermal expansion glass-ceramic (LEGC), the role of chemical constituents and additives, the effect of heat-treatment, and microstructural evolution while processing LEGC. 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.

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