The role of titania and titania mixtures in the nucleation and crystallization of spodumene—willemite—diopside glasses

El-Shennawi, A. W. A.; Omar, A.A.; Morsy, Ayman M.

doi:10.1016/0040-6031(82)87077-9

Cited by 18 publications

(7 citation statements)

References 13 publications

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“…Nucleating agents, such as certain oxides, noble metals and sulfides or fluorides, are normally added to the base glass to promote internal nucleation [6,7]. The most frequently used nucleating agents for LAS GCs are TiO 2 and ZrO 2 , used separately or mixed, which is reportedly more efficient than the same amount of either individual component [8,9].…”

Section: Introductionmentioning

confidence: 99%

Non-isothermal sinter-crystallization of jagged Li2O–Al2O3–SiO2 glass and simulation using a modified form of the Clusters model

Soares

Reis

Zanotto

et al. 2012

Journal of Non-Crystalline Solids

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We have tested a modified form of the Clusters model of sintering for the complex case of non-isothermal sintering with concurrent crystallization of a multicomponent lithium aluminum silicate (LAS) glass having a broad size distribution of jagged particles. We compared experimental and simulated densification data using a constant heating rate. Only one adjustable parameter was used: the particle shape factor (K s ). We discuss the results in light of some complicating factors, such as temperature gradients within the powder compacts and compositional shifts of the residual glass matrix due to crystallization, which lead to changes of viscosity. The modified Clusters model accurately predicted the temperature dependence of densification and the final (saturation) density of the glass particle compacts.

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Section: Introductionmentioning

confidence: 99%

Non-isothermal sinter-crystallization of jagged Li2O–Al2O3–SiO2 glass and simulation using a modified form of the Clusters model

Soares

Reis

Zanotto

et al. 2012

Journal of Non-Crystalline Solids

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“…1) This corresponds to the case of TiO 2 , in which provides a better condition for crystal growth by catalyzing the formation of Zn 2 SiO 4 and by lowering viscosity of the glaze. 5) Figure 12 is Raman spectroscopy of G4 glaze added with 1 wt% Ni. It shows a weak characteristic band of Zn 2 SiO 4 at 864 cm -1 on the glassy glaze part where no crystal is observed.…”

Section: Changes In Seeds With Coloring Agentsmentioning

confidence: 99%

Effects of Nucleating Seeds on Coloring of Zn<sub>2</sub>SiO<sub>4</sub> Crystal Glazes

Lee¹

2015

Journal of the Korean Ceramic Society

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The colorization of Zn 2 SiO 4 crystal glazes was investigated by adding nucleating seeds with various coloring agents. The addition of color fixing agents such as Fe 2 O 3 , MnO 2 , and NiO with seeds caused changes in the colors of glazes. The crystallinity and crystal size were dependent on glaze composition and firing schedules. By controlling coloring agents and firing schedules, it was possible to create various colors and sizes of crystals in a zinc-based crystalline glaze.

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“…Similar cases were found in the literature. [14][15][16] Consequently, on reheating the glass, TiO 2 seems to enhance glass in glass separation. Nevertheless, crystallisation of magnesium dititanate MgTi 2 O 5 in the NNMT2 sample indicates the possibility of formation of heterogeneous nucleant centres of such titanate early in heat treatment.…”

Section: Xrd Analysismentioning

confidence: 99%

Crystallisation of processed nepheline syenite–magnesite glasses

Hamzawy¹,

Khater²

2005

Advances in Applied Ceramics

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Transparent glasses were prepared from processed nepheline syenite-magnesite mixtures. Incorporation of TiO 2 in the base glasses changes the glass colour from white to amber or dark brown. Translucent porcelainous glass ceramics with white, creamy and a variety of bluish colorations were obtained in glasses containing non-magnetic nepheline syenite. However, dark marblelike glass ceramics were developed in glasses containing middling and tailing nepheline syenite. Aluminium diopside [Ca(Mg,Al)(Si,Al) 2 O 6 ], nepheline, forsterite, magnesium titanate MgTi 2 O 5 and hematite were developed by heat treatment of these glasses. SEM micrographs tend to show fine and uniform bulk with increasing Fe 2 O 3 contents in the parent glass ceramic samples, however addition of TiO 2 enhances nucleation and the microstructure becomes of evenly good uniform fine structure in the sample with lowest iron content.

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The role of titania and titania mixtures in the nucleation and crystallization of spodumene—willemite—diopside glasses

Cited by 18 publications

References 13 publications

Non-isothermal sinter-crystallization of jagged Li2O–Al2O3–SiO2 glass and simulation using a modified form of the Clusters model

Non-isothermal sinter-crystallization of jagged Li2O–Al2O3–SiO2 glass and simulation using a modified form of the Clusters model

Effects of Nucleating Seeds on Coloring of Zn<sub>2</sub>SiO<sub>4</sub> Crystal Glazes

Crystallisation of processed nepheline syenite–magnesite glasses

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