Microstructural analysis of secondary phases in silicon carbide fabricated with SiC nano-powder and sintering additives

Takaaki Koyanagi, Sosuke Kondo, Tatsuya Hinoki

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

6 Citations (Scopus)

Abstract

Chemical composition, structure and distribution of secondary phases in two kinds of monolithic SiC ceramics fabricated by liquid phase sintering with SiC nano-powder and 6 or 9 wt.% sintering additives of Al2O3 and Y2O3 were investigated. The major secondary phase in both samples was identified as crystalline yttrium aluminum garnet (YAG) by XRD pattern. EPMA-WDS analysis revealed that the sample containing 9 wt.% additives had the relatively distinct Y-rich and Al-rich regions, by contrast with relatively-homogeneous distribution of the additives elements in the sample containing 6 wt.% additives. The dominating secondary phases at triple junctions of YAG for Y-rich regions and Al2O3 for Al-rich regions in SiC (9 wt.% additives) were identified by TEM-EELS analysis. In SiC (6 wt.% additives), the dominating YAG was observed at triple junctions. High-resolution TEM revealed that amorphous films with content Y, Al and O existed at both the SiC-SiC and SiC-YAG grain boundaries.

Original languageEnglish
Title of host publicationCeramic Materials for Energy Applications - A Collection of Papers Presented at the 35th International Conference on Advanced Ceramics and Composites, ICACC
Pages53-61
Number of pages9
Edition9
Publication statusPublished - 2011
EventCeramic Materials for Energy Applications - 35th International Conference on Advanced Ceramics and Composites, ICACC - Daytona Beach, FL, United States
Duration: 2011 Jan 232011 Jan 28

Publication series

NameCeramic Engineering and Science Proceedings
Number9
Volume32
ISSN (Print)0196-6219

Conference

ConferenceCeramic Materials for Energy Applications - 35th International Conference on Advanced Ceramics and Composites, ICACC
Country/TerritoryUnited States
CityDaytona Beach, FL
Period11/1/2311/1/28

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