ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract The effect of pre-mullite structure on crystallization of mullite from aluminosilicate gels was investigated. The aluminosilicate gels were prepared by hydrolytic poly condensation of silicon alkoxide aluminium with alkoxide, with colloidal alumina and with aluminium nitrate. The structural differences in these materials were characterized by27Al and29Si nuclear magnetic resonance and X-ray diffraction. Their thermal behaviour was monitored by differential thermal analysis. These investigations show that the crystallization process in this system is fundamentally affected by the nature of the ultrastructure. A spontaneous crystallization of mullite at ∼ 980°C is promoted by a high degree of homogeneity and the network connectivity between silicon and aluminium. A method that provides condensation of such an ultrastructure is also given.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01165952
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