Strain tolerant porous silicon nitride

Journal Article · Sat Feb 01 04:00:00 EST 1997 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/j.1151-2916.1997.tb02856.x· OSTI ID:483671

Shigegaki, Yasuhiro ^[1]; Brito, M E; Hirao, Kiyoshi; Toriyama, Motohiro; Kanzaki, Shuzo ^[2]

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

An approach to material strain tolerance, which basically makes it possible to lower the elastic modulus while retaining strength, was experimentally confirmed using as an example a porous silicon nitride composed of oriented anisotropic grains and pores. The porous structure consisting of tightly tangle rodlike grains and anisotropic pores was obtained by using {beta}-Si{sub 3}N{sub 4} whiskers. This material exhibited a low Young`s modulus while retaining a relatively high fracture stress, even though it contained 14.4% porosity. Consequently, the strain to failure of silicon nitride was appreciably increased.

• Sponsoring Organization: USDOE
• OSTI ID: 483671
• Journal Information: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 2 Vol. 80; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANISOTROPY
BULK DENSITY
FRACTURE PROPERTIES
MECHANICAL PROPERTIES
ORIENTATION
PORE STRUCTURE
SILICON NITRIDES
SINTERING
WHISKERS
YOUNG MODULUS