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Solution Chemistry in the A12O3-Sio2 System

Published online by Cambridge University Press:  28 February 2011

W.G. Fahrenholtz ,
S.L. Hietala ,
D.M. Smith ,
A.J. Hurd ,
C.J. Brinker  and
W.L. Earl
W.G. Fahrenholtz
Affiliation:
UNM/NSF Center for Micro-Engineered Ceramics, University of New Mexico, Albuquerque, NM 87131
S.L. Hietala
Affiliation:
UNM/NSF Center for Micro-Engineered Ceramics, University of New Mexico, Albuquerque, NM 87131
D.M. Smith
Affiliation:
UNM/NSF Center for Micro-Engineered Ceramics, University of New Mexico, Albuquerque, NM 87131
A.J. Hurd
Affiliation:
Sandia National Laboratories, P.O. Box 5800, Albuquerque, NM 87185
C.J. Brinker
Affiliation:
Sandia National Laboratories, P.O. Box 5800, Albuquerque, NM 87185
W.L. Earl
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545
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Abstract

In the alumina-silica system, the surface area of gels exhibit dependence upon both composition and the fluid in the pores during drying. Under controlled conditions, an anomalous drop in both the surface area and skeletal density of identically prepared gels occurs at a composition of 47% alumina. An effort has been made to understand the reasons for this phenomenon. The effect of various solution precursor systems has been investigated. Precursors that contain boehmite, or other colloidal species, do not exhibit low surface area/density at 47% alumina. Data from light scattering, infrared spectroscopy, and solution NMR will be discussed for the precursor system used to prepare low surface area gels. Data will be interpreted to determine the effect of solution structure on gel characteristics.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 180: Symposium A – Better Ceramics Through Chemistry IV , 1990 , 229
Copyright
Copyright © Materials Research Society 1990

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References

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