Nucleation and crystallization kinetics of CaO-Al2O3-2SiO2 in powdered anorthite glass

Park, H. C.; Lee, S. H.; Ryu, Bong Ki; Son, M.M.; Lee, H. S.; Yasui, Itaru

doi:10.1007/bf00356446

Cited by 39 publications

(23 citation statements)

References 23 publications

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“…Comparing the values estimated for the Avrami exponent with the theoretical values [35], it is suggested that surface crystallization (n E 1) is dominant during the crystallization process associated with the first peak, whereas volume crystallization (n E 3) is dominant during crystallization associated with the second peak.…”

Section: Crystallization Kineticsmentioning

confidence: 94%

“…It is observed that for the entire range of 0.1rχr0.9, the average value of n(χ) for the first peak is about 1.6 for glass S1 and about 1.1 for glass S2, and that the average value of n(χ) for the second peak is about 3 for glass S1 and about 2.9 for glass S2. Comparing the values calculated for n(χ) with the theoretical values [35], a surface crystallization mechanism (nE1) may be considered for the crystallization process associated with the first exothermic peak, and a volume crystallization mechanism (nE3) may be considered for the crystallization process associated with the second exothermic peak at the various heating rates. Fig.…”

Section: Fig 3 Illustration Of Area a Between T I And T F And Of mentioning

confidence: 99%

See 1 more Smart Citation

Crystallization of lithium disilicate-based multicomponent glasses – effect of silica/lithia ratio

Soares

Monteiro

Lima

et al. 2015

Ceramics International

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Section: Crystallization Kineticsmentioning

confidence: 94%

Section: Fig 3 Illustration Of Area a Between T I And T F And Of mentioning

confidence: 99%

Crystallization of lithium disilicate-based multicomponent glasses – effect of silica/lithia ratio

Soares

Monteiro

Lima

et al. 2015

Ceramics International

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“…3). [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][19][20][21][22][23][24][35][36][37] As pointed out by Sundaresan and Aksay 6 for type (1) starting materials, diffusion becomes more dominant as the rate-controlling step at increasing higher mullitization temperatures. Thus, the dominant kinetic mechanism changes from nucleation to growth and the rate-controlling step changes from the release of alumina in type (1) starting materials and from nucleation control in type (2) to diffusion controlled at higher mullitization temperatures.…”

Section: Activation Energy and Mullitization Temperaturementioning

confidence: 97%

Activation energy of mullitization from various starting materials

Okada

2008

Journal of the European Ceramic Society

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“…Anorthite based ceramics can be obtained by a controlled devitrification of glass, sometimes with addition of a nucleation agent [2,43], or from kaolin and calcium carbonate mixtures. Anorthite was prepared from raw materials (kaolin and limestone) for the first time in [2].…”

Section: Cerâmicas De Boa Qualidade Têm Alto Custo O Que Limita O Sementioning

confidence: 99%

Mechanical properties of anorthite based ceramics prepared from kaolin DD2 and calcite

et al. 2017

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Anorthite is widely spread in nature and belongs to the plagioclase group of rock forming minerals. Plagioclases represent a continuous series of solid solutions between anorthite (CaO.Al 2 O 3 .2SiO 2 ) and albite (Na 2 O.Al 2 O 3 .6SiO 2 ) and form an enormous group of triclinic minerals. harabi52@gmail.com, Zaiou_21@yahoo.fr, guechia@yahoo.fr, semouni84@gmail.com, kanour17@yahoo.fr, foughali_lazhar@yahoo.fr, zouaisouheila@yahoo.fr, mezahif@yahoo.fr, guerfatiha@gmail.com Mineralogically, anorthite is reported as a chemically weak mineral, resulting in a basic reaction when dissolved into boiling water, while strong acidic and basic solutions dissolve it. Glass-ceramics and ceramics with crystalline anorthite are mainly used in electrical, thermo-mechanical and water resistance applications [1][2][3][4]. Anorthite is an important technical ceramic material that has good physical properties, such as very low thermal expansion coefficient, low dielectric constant and loss, good thermal shock resistance, and high creep resistance at high AbstractGood quality ceramics costs a lot that has limited their use in developing countries. This work was devoted to prepare low-cost and good quality anorthite based ceramics. The proposed composition was 80 wt% kaolin (DD2 type) and 20 wt% calcium oxide (CaO). The choice of these raw materials was dictated by their natural abundance coupled with a modified milling system, as another interesting advantage. Previous studies have shown that a simple vibratory multidirectional milling system using bimodal distribution of highly resistant ceramic milling elements has been successfully applied for obtaining fine powders. The influence of the relatively lower sintering temperature, ranging from 800 to 1100 °C, on the porosity and the average pore size (APS) have been investigated. The APS and the porosity values of samples sintered at 950 °C were about 1 μm and 4%, respectively. The best Vickers microhardness and 3-point bending strength values for these sintered samples, using this proposed milling system, were 7.1 GPa and 203 MPa, respectively. Finally, the crystalline phase evolution during heat treatment was investigated by X-ray diffraction, Fourier transform infrared spectroscopy and scanning electron microscopy techniques.

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Nucleation and crystallization kinetics of CaO-Al2O3-2SiO2 in powdered anorthite glass

Cited by 39 publications

References 23 publications

Crystallization of lithium disilicate-based multicomponent glasses – effect of silica/lithia ratio

Crystallization of lithium disilicate-based multicomponent glasses – effect of silica/lithia ratio

Activation energy of mullitization from various starting materials

Mechanical properties of anorthite based ceramics prepared from kaolin DD2 and calcite

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