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Fine Pure Mullite Powder by Homogeneous Precipitation by Satoshi Sugita Sueyoshi; César A. Contreras Soto is a Materials Science article available to read on EtoBox.

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A fine pure mullite powder was prepared by homogeneous precipitation. A suspension consisting of fumed silica (Aerosil 200@) and a mixture of aqueous solutions of aluminium sulphate and ammonium bisulphite, was heated to decompose and eliminate sulphur dioxide. This homogeneous precipitation process produced an amorphous basic aluminium sulphate salt coating the surface of fumed silica. This precursor was transformed principally into Al-S spine1 immediately after the decomposition of sulphate at 95o"C, at the same time, a trace of crystalline mullite was produced. The phase changed according to heating temperatures from 950" to 13.50" C for 1 h. The single phase of mullite was obtained by calcining the precursor at temperatures higher than 125o"C, and the peak of the XRD and IR were sharpened with increasing temperature. The powder calcined at 1350°C was characterized by XRD, IR, SEM, and KlyachkoGurvich technique. The final product was an agglomerate consisted of lOO-200nm mullite particles in size, and from which fine pure mullite particles were easily obtained by milling. The specific surface area of mullite powder was 27..5m2gP'. This process for preparing fine mullite powder w

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Author

Satoshi Sugita Sueyoshi; César A. Contreras Soto

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0955-2219)

Published

1998

Language

EN

Field

Materials Science (Physical Sciences)