STRUCTURE OF MULLITE COATINGS GROWN BY CHEMICAL-VAPOR-DEPOSITION

Authors
DOPPALAPUDI D BASU SN
Citation
D. Doppalapudi et Sn. Basu, STRUCTURE OF MULLITE COATINGS GROWN BY CHEMICAL-VAPOR-DEPOSITION, Materials science & engineering. A, Structural materials: properties, microstructure and processing, 231(1-2), 1997, pp. 48-54
Citations number
27
Categorie Soggetti
Material Science
Journal title
Materials science & engineering. A, Structural materials: properties, microstructure and processing → ACNP
ISSN journal
09215093
Volume
231
Issue
1-2
Year of publication
1997
Pages
48 - 54
Database
ISI
SICI code
0921-5093(1997)231:1-2<48:SOMCGB>2.0.ZU;2-C
Abstract
Dense mullite coatings have been deposited on SiC and Si3N4 substrates by chemical vapor deposition (CVD). The coatings were compositionally graded with the Al/Si ratio increasing from 1.5 at the substrate/coat ing interface, to a value of 8 at the coating surface. This gradation of composition is discussed in light of changes in the concentration o f oxygen vacancies, ordering of the vacancies, formation and size of d omains and the observed changes in lattice parameters. (C) 1997 Elsevi er Science S.A.