Si3N4/SiC-Whisker Composites without Sintering Aids: II, Fracture Behavior

Si3N4/SiC-Whisker Composites without Sintering Aids: II, Fracture Behavior

The fracture behavior of an Si3N4/SiC‐whisker composite fabricated without sintering aids is investigated using a double approach based on the examination of R‐curve behavior and a statistical analysis of crack propagation. In the composite with 20 vol% whisker, a 30% increase in toughness over the...

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Veröffentlicht in:Journal of the American Ceramic Society 1990-10, Vol.73 (10), p.3039-3045
Hauptverfasser: Pezzotti, Giuseppe, Tanaka, Isao, Okamoto, Taira
Format: Artikel
Sprache:eng
Schlagworte:
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
composites
Exact sciences and technology
fracture toughness
silicon carbide
silicon nitride
Structural ceramics
Technical ceramics
whiskers
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Zusammenfassung:The fracture behavior of an Si3N4/SiC‐whisker composite fabricated without sintering aids is investigated using a double approach based on the examination of R‐curve behavior and a statistical analysis of crack propagation. In the composite with 20 vol% whisker, a 30% increase in toughness over the matrix value can be attributed to crack‐tip phenomena. Strong interfacial bonding prevents any contribution to toughening by mechanisms operating in the wake region of the crack. Based on experimental observations of microfracture in both SiC whiskers and Si3N4 grains, toughening caused by crack‐tip phenomena is quantitatively discussed in terms of fracture energy and whisker‐distribution parameters.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1151-2916.1990.tb06713.x