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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of sol gel science and technology 5 (1995), S. 41-47 
    ISSN: 1573-4846
    Keywords: cordierite ; basic hydrolysis ; crystallisation ; sinterability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Synthesis of cordierite gels was performed using Si(OC2H5)4 and aluminum and magnesium nitrates as starting materials under basic conditions. Further heat treatment yields the successive crystallisation of μ and α-cordierites and of some amounts of spinel as a secondary phase as revealed by X-ray diffraction. The poor final densification (84% of the theoretical value) of samples obtained from the as-prepared powders has been improved by ball-milling to values up to 95–98% of the theoretical value, the spinel proportion being simultaneously decreased.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of sol gel science and technology 2 (1994), S. 399-402 
    ISSN: 1573-4846
    Keywords: mullite ; sol-gel process ; crystallization ; sinterability ; chemical modification
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Mullite gels have been prepared using tetraethyl orthosilicate and aluminium tri-sec-butoxide chemically modified by ethylacetoacetate as precursors. The hydrolysis conditions are shown to have a very noticeable influence on the evolution of both phase and microstructure of the resulting xerogels. The optimization of thermal treatment allows well crystallized mullite samples with a density more than 90% of the theoretical value after sintering at 1200°C for 4 hours to be obtained.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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