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Polymer-derived Si3N4−ZrO2 nanocomposite powders

Published online by Cambridge University Press:  31 January 2011

Gian Domenico Sorarù ,
Alberto Ravagni ,
Roberto Dal Maschio ,
Giovanni Carturan  and
Florence Babonneau
Gian Domenico Sorarù
Affiliation:
Dipartimento di Ingegneria dei Materiali, Università di Trento, 38050 Mesiano-Trento, Italy
Alberto Ravagni
Affiliation:
Dipartimento di Ingegneria dei Materiali, Università di Trento, 38050 Mesiano-Trento, Italy
Roberto Dal Maschio
Affiliation:
Dipartimento di Ingegneria dei Materiali, Università di Trento, 38050 Mesiano-Trento, Italy
Giovanni Carturan
Affiliation:
Dipartimento di Ingegneria dei Materiali, Università di Trento, 38050 Mesiano-Trento, Italy
Florence Babonneau
Affiliation:
Chimie de la MatiéGre Condensée, Université Pierre et Marie Curie, 4 place Jussieu, 75005 Paris, France
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Abstract

A Zr-modified polycarbosilane has been obtained reacting a zirconium alkoxide with a polycarbosilane. This new preceramic polymer has been nitridated in flowing ammonia up to 1000 °C. The conversion process of the polymer precursor to the Si–N–Zr–O ceramic has been followed mainly by FT-IR, XRD, and TEM investigations. The formation of the Si–N–Si network starts at 600 °C. At 1000 °C the system can be described as an amorphous silicon nitride ceramic in which very fine zirconia-based particles are dispersed. Increasing the temperature to 1300 °C results in the crystallization of t-ZrO2 microcrystals (35 Å in size). At higher temperatures the crystallization of the silicon nitride matrix into β–Si3N4 has been observed.

Type
Articles
Information
Journal of Materials Research , Volume 7 , Issue 5 , May 1992 , pp. 1266 - 1270
Copyright
Copyright © Materials Research Society 1992

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