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Mullite Processing, Structure, and Properties J A m Ceiarn SOC, 74 [lo] 2388-92 (19911
 

Summary: Mullite Processing, Structure, and Properties
J A m Ceiarn SOC, 74 [lo] 2388-92 (19911
journal
Mullitization of Diphasic Aluminosilicate Gels
Sankaran Sundaresan
Department of Chemical Engineering, Princeton University, Princeton, New Jersey 08544-52263
llhan A. Aksay*
Department of Materials Science and Engineering and Advanced Materials Technology Center,
Washington Technology Center, University of Washington, Seattle, Washington 98195
Recent studies have shown that the mullitization of diphasic
aluminosilicate matrices comprising transitional alumina
and amorphous silica occurs via a nucleation and growth
process. Nucleation is preceded by a temperature-dependent
incubation period. Following this incubation period, rapid
nucleation of mullite occurs, producing about 1.8 X
10" nuclei/cm3, which remains constant throughout the rest
of the transformation. Both incubation and mullite growth
are thermally activated processes with apparent activation
energies of 987 f 63 and 1070 f 200 kJ/mol, respectively.
The growth rate of mullite grains under isothermal condi-

  

Source: Aksay, Ilhan A. - Department of Chemical Engineering, Princeton University

 

Collections: Materials Science