Si3N4/SiC nanocomposite powder from a preceramic polymeric network based on poly(methylsilane) as the SiC precursor

The pyrolysis of the PMS/TAS polymer as the in situ SiC source, in the presence of Si3N4 powder, gave rise to Si3N4/SiC nanocomposite powder with beta-SiC uniformly distributed in the matrix of Si3N4 particles. Growth of beta-SiC whiskers was observed when the composite was heated at 1400 C, under a...

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Published inMaterials research (São Carlos, São Paulo, Brazil) Vol. 4; no. 1; pp. 13 - 17
Main Authors Gozzi, Maurício F., Radovanovic, Eduardo, Yoshida, I. Valéria P.
Format Journal Article
LanguageEnglish
Portuguese
Published ABM, ABC, ABPol 01.01.2001
Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)
Subjects
composite powders
ENGINEERING, CHEMICAL
MATERIALS SCIENCE, MULTIDISCIPLINARY
METALLURGY & METALLURGICAL ENGINEERING
silicon carbide
silicon nitride
silicon nitride
silicon carbide
composite powders
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Summary:The pyrolysis of the PMS/TAS polymer as the in situ SiC source, in the presence of Si3N4 powder, gave rise to Si3N4/SiC nanocomposite powder with beta-SiC uniformly distributed in the matrix of Si3N4 particles. Growth of beta-SiC whiskers was observed when the composite was heated at 1400 C, under argon atmosphere. At 1600 C, these SiC whiskers were embedded in the matrix, and the alpha to beta Si3N4 phase transformation took place. There was no evidence of Si formation. The results confirmed the basic concept that the thermal stability behaviour of Si3N4/SiC composite powders can be remarkably improved via the incorporation of nanosized SiC, obtained from polymeric precursor. 34 refs.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:1516-1439
1980-5373
1516-1439
DOI:10.1590/S1516-14392001000100004