Effects of CaO on crystallization properties in BaO–SrO–TiO2–SiO2 glass–ceramics

Duan, Fei

doi:10.1016/j.jnoncrysol.2011.01.011

Cited by 9 publications

(16 citation statements)

References 25 publications

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“…5 Some routes for the preparation of oriented fresnoite ceramics have been reported in the literature, including electrochemical nucleation, [6][7][8][9][10][11] laser-induced crystallisation [12][13][14][15] and surface crystallisation. [16][17][18][19][20][21][22] When aiming for macroscopic, highly oriented structures, laser induced crystallisation is of limited use; however, samples of 10 6 10 6 50 mm 3 have been produced under laboratory conditions via electrochemically induced nucleation. [8][9][10][11] Surface crystallisation, however, holds the potential to achieve plates (or other shapes 15 ) of oriented crystals in any dimension.…”

Section: Introductionmentioning

confidence: 99%

Sr-fresnoite surface crystallisation in a 2SrO·TiO2·2.75 SiO2 glass studied by EBSD

2012

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A glass of the composition 2SrO?TiO 2 ?2.75SiO 2 was melted. Cooled samples were polished and thermally annealed at 970 uC for 10 min to 20 h to achieve surface crystallisation of Sr 2 TiSi 2 O 8 fresnoite. At the surface, the crystals were immediately oriented with their crystallographic c-axes perpendicular to the surface. Crystal growth occurred in the form of similarly oriented structures. Very homogeneous structures were also observed but they fray into areas of higher orientation diversity at some distance from the surface. The crystallised areas were highly permeated by nanoscale inclusions of residual glass. Kinetic selection occurs and leads to a preferred orientation with the crystallographic c-axis tilted by about 43 ¡ 5u from the surface normal after about 300 mm. Crystal growth is not governed by the fastest growing crystallographic direction or the formation of a diffusion barrier, but rather by the ability to circumvent the residual glass.

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Section: Introductionmentioning

confidence: 99%

Sr-fresnoite surface crystallisation in a 2SrO·TiO2·2.75 SiO2 glass studied by EBSD

2012

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“…This phenomenon is more obvious when the CaO/SiO 2 ratio is low. Si At the same time, Ca 2+ can lead to a polarization of the Si 4+ cation, weakening the covalent bonds between Si and O and making them easier to break [9]. Basic oxide (CaO) can form compounds with low melting point.…”

Section: Resultsmentioning

confidence: 99%

EFFECT OF CaO/SiO₂ AND HEAT TREATMENT ON THE MICROSTRUCTURE OF GLASS-CERAMICS FROM BLAST FURNACE SLAG

Xie¹

2016

Ceramics - Silikaty

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“…The exothermic effect during the heating treatment of the glass is attributed to the crystallization of the glasses. The effect of CaO on the crystallization temperature has been investigated in some reports, but different conclusions were drawn due to various chemical composition of the glasses. In our study, it is found that the crystallization temperature ( T p ), corresponding to the temperature of exothermic peak, increases from 917 to 936 °C with the increase in basicity from 0.4 to 0.6 and then decreases to 898 °C with the further increase in the basicity.…”

Section: Resultsmentioning

confidence: 99%

The Effect of Basicity and Calcium Fluoride on Glass-Ceramic Production and Iron Recovery from Copper Slag

Yang

2016

steel research int.

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Glass-ceramics can be prepared and the iron can be effectively extracted from iron-rich copper slag in the same process to achieve the comprehensive utilization of the solid wastes. However, it is a great challenge to get the glass-ceramics with good properties and the iron with low sulfur concentration at the same time. In this paper, the effects of basicity and calcium fluoride on sulfur content of the obtained iron and production of the glassceramics from copper slag are investigated. The sulfur content of the recovered iron is determined by carbon sulfur analyzer, and the as-prepared glass-ceramics are characterized by DSC, XRD, and SEM. The results show that with the increase in the basicity, the sulfur content of the recovered iron greatly decreases, while the properties of the as prepared glass-ceramics firstly increase and then decrease, reaching the maximum value for the basicity of 0.6. The crystalline phases of the glass-ceramics are anthorite, diopside, wollastonite, and gehlenite, and the increase in the basicity favors the formation of gehlenite. The substitution of CaF 2 for CaO obviously increases the sulfur content of the recovered iron. Moreover, the increase of CaF 2 increases the crystal size and negatively affects the properties of the glass-ceramics.

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Effects of CaO on crystallization properties in BaO–SrO–TiO2–SiO2 glass–ceramics

Cited by 9 publications

References 25 publications

Sr-fresnoite surface crystallisation in a 2SrO·TiO2·2.75 SiO2 glass studied by EBSD

Sr-fresnoite surface crystallisation in a 2SrO·TiO2·2.75 SiO2 glass studied by EBSD

EFFECT OF CaO/SiO₂ AND HEAT TREATMENT ON THE MICROSTRUCTURE OF GLASS-CERAMICS FROM BLAST FURNACE SLAG

The Effect of Basicity and Calcium Fluoride on Glass-Ceramic Production and Iron Recovery from Copper Slag

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