Fracture and subcritical crack-growth behavior of Y-Si-Al-O-N glasses and Si{sub 3}N{sub 4} ceramics
Journal Article
·
· Journal of the American Ceramic Society
OSTI ID:20020619
Fracture and environmentally assisted subcritical crack-growth processes are examined in bulk Y-Si-Al-O-N oxynitride glasses with compositions typical of the grain boundary phase of silicon nitride ceramics. Both long-crack (in compact tension specimens) as well as short-crack behavior (using indentation techniques) were investigated to establish a reliable fracture toughness and to elucidate the anomalous densification behavior of the oxynitride glass. Environmentally assisted subcritical crack-growth processes were studied in inert, moist, and wet environments under both cyclic and static loading conditions. Behavior is discussed in terms of the interaction of the environment with the crack tip. Likely mechanisms for environmentally assisted crack growth are discussed and related to the subcritical crack-growth behavior of silicon nitride ceramics.
- Research Organization:
- Stanford Univ., CA (US)
- OSTI ID:
- 20020619
- Journal Information:
- Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 3 Vol. 83; ISSN 0002-7820; ISSN JACTAW
- Country of Publication:
- United States
- Language:
- English
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