Nucleation and crystal growth of glasses produced by a generic plasma arc-process

Hernández-Crespo, M. S.; Romero, Maximina; Rincón, J.Ma.

doi:10.1016/j.jeurceramsoc.2005.03.236

Cited by 29 publications

(16 citation statements)

References 24 publications

(24 reference statements)

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“…The T f and T m varied with the heating rate. Other authors found T g heating rate dependency [2,24]. It is evident that T f increases incrementally with increasing ZrO 2 content from 515 °C to 522 °C for the series A to E. Addition of ZrO 2 will increase the number of bridging oxygens per silicon atom and the presence of Zr 4+ ions will impart a higher packing density and higher T g .…”

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confidence: 84%

Thermal behaviour of zircon/zirconia-added chemically durable borosilicate porous glass

et al. 2013

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Macroporous alkali resistant glass has been developed by making additions of zirconia (ZrO 2 ) and zircon (ZrSiO 4 ) to the sodium borosilicate glass system SiO 2 -B 2 O 3 -Na 2 O. The glass was made using a traditional high temperature fusion process. Differential thermal analysis (DTA) was carried out to identify the glass transition temperature (T g ) and crystallisation temperature (T x ). Based on these findings, controlled heattreatments were implemented to separate the glass into two-phases; a silica-rich phase, and an alkali-rich borate phase. X-ray diffraction (XRD) was used to identify any crystal phases present in the as-quenched and heat-treated glasses. Fourier transform infrared (FTIR) spectroscopy also proved effective in investigating phase separation and crystallisation behaviour. After leaching, a silica-rich skeleton with an interconnected pore structure and a uniform pore distribution was observed. Pore characterisation was carried out using mercury porosimetry. The size and shape of the pores largely depended on the heattreatment temperature and time. ZrO 2 /ZrSiO 4 additions increased the alkali resistance of the porous glass 3-4 times.

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confidence: 84%

Thermal behaviour of zircon/zirconia-added chemically durable borosilicate porous glass

et al. 2013

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“…They can also be prepared from cheaper raw materials such as wastes because the glass-ceramic process has been established as a suitable way to valorise mining and industrial wastes [29,30], including fly ash from incineration [31,32] and thermal power plants [4,33], wastes from hydrometallurgical processing plants [30], residual glass fibres from polyester matrix composites [34] and bagasse ashes [8], among others wastes. One residue that has experienced a significant increase in production in recent years is biomass ash, which originates from the combustion of biological material for energy purposes.…”

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confidence: 99%

Crystallisation and microstructure of nepheline–forsterite glass-ceramics

Martı́n

Andreola

Barbieri

et al. 2013

Ceramics International

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This work presents the results of a study focused on the development of forsterite-nepheline glass-ceramic with the use of rice husk ash (RHA) as a silica source. The glass-ceramics were produced by a sintering process of a glassy frit formulated in the MgO-Al 2 O 3 -SiO 2 base system with the addition of B 2 O 3 and Na 2 O to facilitate the melting and pouring processes. The crystallisation study was carried out by depicting the TTT curve (Time-TemperatureTransformation). The mineralogical characterisation of the glass-ceramic materials was carried out using X-ray diffraction (XRD). The crystallisation activation energies were calculated by the Kissinger method. The results obtained show that devitrification of the RHA glass leads to a glass-ceramic material composed of nepheline (Na 2 O·Al 2 O 3 ·2SiO 2 ) and forsterite (2MgO·SiO 2 ).A study of the microstructure by scanning electron microscopy (SEM) allowed to establish the morphological evolution in both the shape and spatial arrangement of the nepheline and forsterite crystals on heating.

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“…Table 1 Glass-ceramics from PG glass were prepared by a sintering route reported in a previous work 21 . The glass powder was ground in a ball mill and sieved to <200 µm.…”

Section: Methodsmentioning

confidence: 99%

Leaching behaviour of a glassy slag and derived glass ceramics from arc plasma vitrification of hospital wastes

Romero

Hernández-Crespo

Rincón

2009

Advances in Applied Ceramics

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The arc-plasma vitrification of a hospital wastes containing metals and inorganic oxides yields to a leachresistant glassy or vitreous slag, which can be environmentally safe for landfill disposal or could be transformed in glass-ceramic tiles with physical and mechanical properties similar to those showed by marketable products for building applications. Standard methods have been used for testing the leachability of elements from this new type of tiles. The water resistance was evaluated by the DIN 38414 S4 standard and the chemical durability of glass and glass-ceramics by the weight losses per surface unit, employing NaOH and HCl (5%) aqueous solutions, at boiling temperature. Results show that although glass-ceramic tiles are most water leachable than original plasma vitreous glass, the concentration of toxic minor elements in their leaching solutions are lower than those allowed by the Normative.

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Nucleation and crystal growth of glasses produced by a generic plasma arc-process

Cited by 29 publications

References 24 publications

Thermal behaviour of zircon/zirconia-added chemically durable borosilicate porous glass

Thermal behaviour of zircon/zirconia-added chemically durable borosilicate porous glass

Crystallisation and microstructure of nepheline–forsterite glass-ceramics

Leaching behaviour of a glassy slag and derived glass ceramics from arc plasma vitrification of hospital wastes

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