Effects of hydrolysis processing on the character of forsterite gel fibers. Part II: crystallites and microstructural evolutions

Crystallites and microstructural evolutions of the three forsterite fibers derived from three different precursor sols were compared. The formation of crystalline forsterite commenced at a temperature as low as 550 °C in all the fibers. Gel fiber prepared with excess ethanol showed a lower homogenei...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2002-07, Vol.22 (7), p.1085-1094
Main Author: Tsai, M.T
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Ceramic and carbon fibers
Ceramic industries
Chemical industry and chemicals
Crystallites
Exact sciences and technology
Fibres
Forsterite
Mg 2SiO 4
Microstructure
Technical ceramics
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Summary:Crystallites and microstructural evolutions of the three forsterite fibers derived from three different precursor sols were compared. The formation of crystalline forsterite commenced at a temperature as low as 550 °C in all the fibers. Gel fiber prepared with excess ethanol showed a lower homogeneity and densification; a second phase of magnesia was observed on heating. The water content also affected the grain size and homogeneity of the fired fibers. On heating at 1100 °C, the three forsterite fibers were microporous with grain sizes less than 0.1 μm; further heating at 1300 °C resulted in grain growth up to 0.3–0.5 μm and denser microstructures, depending on the amount of water and ethanol.
ISSN:0955-2219
1873-619X
DOI:10.1016/S0955-2219(01)00418-6