Electron Microscopic Investigations of Electrochemically Induced Mullite Crystallization in a Glassy Matrix

Robert Carl; Günter Völksch; Christian Rüssel

doi:10.4028/www.scientific.net/AMR.39-40.387

Paper Titles

Chemical Durability of Glass Thermal Insulation Fibers in Borate and Phosphate Water Solutions
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The Influence of Metal Diffusion and Interfacial Reactions on the Crystallization Behaviour of Glasses Employed in the Manufacture of Glass-Ceramic-to-Metal Seals
p.369

Effects of Dispersed Al₂O₃ Particles on Sintering of LTCC
p.375

β-Spodumene Glass-Ceramic with Anomalous Low Thermal Expansion
p.381

Electron Microscopic Investigations of Electrochemically Induced Mullite Crystallization in a Glassy Matrix
p.387

Crystallization of Glasses in the MoO₃-Bi₂O₃ System
p.391

Evolution of Absorption Spectra in the Process of Nucleation in Photo-Thermo-Refractive Glass
p.395

Thermal Stability vs. Crystallization of the Lithiumsilicate Glasses with Addition Zirconium Dioxide and Titanium Dioxide
p.399

Developments in Glass Melting Furnace Design, Energy and Environmental Management
p.405

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Electron Microscopic Investigations of Electrochemically Induced Mullite Crystallization in a Glassy Matrix

Abstract:

The electrochemically induced nucleation and crystallization in a glass with the basic composition (mol%) 52.6 SiO2 · 18.7 Al2O3 · 14.3 MgO · 7.8 TiO2 · 4.7 B2O3 · 2.0 CaO leads to the formation of oriented mullite crystals. Electron microscopy techniques (energydispersive X-ray microanalysis and electron backscatter diffraction) were used to analyze the composition and the orientation of the crystals in the glassy matrix. The mean composition of the mullite crystals matches the formula Al4,65Ti0,11Si1,24O9,675. The electron backscatter diffraction pattern is consistent with data from the literature that needle-like mullite crystals are fast-growing parallel to the crystallographic c-axis [001]. The composition of the melt grown mullite crystals does not depend on the melting temperature in the range between 1230 °C and 1350 °C.