Silicon carbide whisker stability during processing of silicon nitride matrix composites

Journal Article · Sat Apr 01 04:00:00 EST 1989 · Journal of the American Ceramic Society; (USA)

DOI:https://doi.org/10.1111/j.1151-2916.1989.tb06186.x· OSTI ID:6072141

Bradley, S A; Karasek, K R ^[1]; Martin, M R; Yeh, H C ^[2]; Schienle, J L ^[3]

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1. Allied-Signal Engineered Materials Research Center, Des Plaines, IL (US)
2. Garrett Ceramic Components Div., Allied-Signal Aerospace Co., Torrance, CA (US)
3. Garrett Auxiliary Power Div., Allied-Signal Aerospace Co., Phoenix, AZ (US)

The effects of two different sources of SiC whiskers on the chemistry and microstructure of the SiC- whisker-Si{sub 3}N{sub 4} composites were evaluated using scanning transmission electron microscopy. Analyses were performed after presintering in N{sub 2} and after encapsulated hot isostatic pressing. Significant differences in the porosity, {alpha}- to {beta}-Si{sub 3}N{sub 4} conversion, and whisker degradation were observed after presintering. It is also noted that whiskers containing surface iron impurities were converted to Si{sub 3}N{sub 4} during processing.

• OSTI ID: 6072141
• Journal Information: Journal of the American Ceramic Society; (USA), Journal Name: Journal of the American Ceramic Society; (USA) Vol. 72:4; ISSN 0002-7820; ISSN JACTA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
656002 -- Condensed Matter Physics-- General Techniques in Condensed Matter-- (1987-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CARBIDES
CARBON COMPOUNDS
CHEMICAL REACTION KINETICS
CRYSTAL STRUCTURE
CRYSTALS
ELECTRON MICROSCOPY
ELEMENTS
FABRICATION
HOT PRESSING
IMPURITIES
IRON
KINETICS
MATERIALS
MATERIALS WORKING
MATRIX MATERIALS
METALS
MICROSCOPY
MICROSTRUCTURE
MONOCRYSTALS
NITRIDES
NITROGEN
NITROGEN COMPOUNDS
NONMETALS
PNICTIDES
POROSITY
PRESSING
REACTION KINETICS
SCANNING ELECTRON MICROSCOPY
SILICON CARBIDES
SILICON COMPOUNDS
SILICON NITRIDES
STABILITY
TRANSITION ELEMENTS
WHISKERS