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J. MATER. CHEM., 1994, 4(2), 353-359 353 Synthesisof Mullite Fibre from an AluminosiloxanePrecursor
 

Summary: J. MATER. CHEM., 1994, 4(2), 353-359 353
Synthesisof Mullite Fibre from an AluminosiloxanePrecursor
Toshinobu Yogo*" and llhan A. Aksaf
a Department of Applied Chemistry, School of Engineering, Nagoya University, Furo-cho, Chikusa-ku,
Nagoya 464-07, Japan
Princeton Materials Institute, Princeton University, Princeton, New Jersey 08544-5263, USA
Mullite fibre was successfully synthesized by pyrolysis of aluminosiloxane formed from ethyl 3-oxobutanoatodi-
isopropoxyaluminium and di-(sec-butoxy)aluminoxytriethoxysilane.Aluminosiloxane increased in viscosity with increas-
ing coordination number of aluminium, which was analysed by 27AINMR spectroscopy. The viscosity of aluminosiloxane
was controlled by the amount of added glacial acetic acid as well as the working temperature for the spinning of
precursor fibre. Aluminosiloxane gave amorphous Si02-A120, at 500"C, which began to crystallize to mullite at 930 "C.
Single-phase mullite was produced on heating to 1000"C for 1 h. The polymer fibre spun from aluminosiloxane was
pyrolysed yielding crack-free mullite fibre at 1000"C for 1 h.
Mullite (3Al20,*2Si0,) has various attractive properties such
as high-temperature strength, creep resistance and a low
thermal expansion coefficient.Fibre-reinforced materials have
been receiving great attention because of their applications in
the field of composites Alumina, alumina-silica,
and alumina-zirconia fibres are mainly used as temperature-
resistant fibres., Refractory oxideshave extremely high melting

  

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

 

Collections: Materials Science