Fracture resistance behavior of multilayered silicon nitride

Journal Article · Tue Apr 01 04:00:00 EST 1997 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/j.1151-2916.1997.tb02931.x· OSTI ID:509237

Ohji, Tatsuki; Miyajima, Tatsuya; Kanzaki, Shuzo ^[1]; Shigegaki, Yasuhiro ^[2]

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1. National Industrial Research Inst. of Nagoya (Japan)
2. Fine Ceramic Research Association, Nagoya (Japan). Synergy Ceramics Lab.

This paper investigates the fracture resistance behavior of a novel silicon nitride with a unique laminated structure consisting of alternate dense and porous layers, in the latter of which {beta}-silicon nitride whiskers were aligned parallel to the layer. The R-curve was determined by using a chevron-notched-beam technique when a crack propagated in the direction normal to the whisker axis. The resistance markedly increased whenever a crack passed the porous layer, resulting in stepwise rising R-curve behavior. Microscopic study revealed that the aligned whiskers were almost completely pulled out in the porous layer.

• Sponsoring Organization: USDOE
• OSTI ID: 509237
• Journal Information: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 4 Vol. 80; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COMPOSITE MATERIALS
CRACKS
FLEXURAL STRENGTH
FRACTURE MECHANICS
FRACTURE PROPERTIES
LAYERS
POROSITY
SILICON NITRIDES
STRESS INTENSITY FACTORS