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Boehmite and Yttrium Oxide Coatings on Silicon Nitride From Aqueous Sols

Published online by Cambridge University Press:  10 February 2011

Michael Buchta  and
Wei-Heng Shih
Michael Buchta
Affiliation:
Department of Materials Engineering, Drexel University, Philadelphia, PA 19104
Wei-Heng Shih
Affiliation:
Department of Materials Engineering, Drexel University, Philadelphia, PA 19104
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Abstract

To improve the processing of silicon nitride, boehmite and yttrium oxide were coated on silicon nitride particles by an aqueous sol-gel method. It is shown that boehmite and Y2O3 can be coated on Si3N4 particles from aqueous solutions. However, the Y2O3 coating is not as complete as boehmite coating. The coating of a yttria coating followed by a boehmite coating was attempted and the TEM showed a coating twice as thick as the Y2O3 or AlOOH coating. Hydrothermal treatment of yttrium nitrate hydrous hydroxide results in the formation and growth of Y(OH)3 fibers which can be calcined and transformed into Y2O3 fibers at 500°C.

Information

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 432: Symposium S – Aqueous Chemistry and Geochemistry of Oxides , 1996 , 201
Copyright
Copyright © Materials Research Society 1997

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