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Mechanical Properties of Unidirectionally Oriented SiC‐Whisker‐Reinforced Si 3 N 4 Fabricated by Extrusion and Hot‐Pressing
Author(s) -
Goto Yasuhiro,
Tsuge Akihiko
Publication year - 1993
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1993.tb03920.x
Subject(s) - whisker , whiskers , materials science , extrusion , monocrystalline whisker , composite material , hot pressing , fracture toughness , anisotropy , perpendicular , pressing , geometry , physics , mathematics , quantum mechanics
SiC‐whisker‐reinforced Si 3 N 4 was fabricated by extrusion and hot‐pressing. A unidirectional alignment of the whiskers was achieved through sheet forming by extrusion. The degree of whisker orientation changed with the thickness of the green sheets. Unidirectionally oriented whiskers increased fracture strength and toughness compared to samples with more randomly oriented whiskers. Anisotropy of fracture strength was observed. Bridging by whiskers impeded crack propagation when the whisker orientation was perpendicular to the crack plane.