Journal
MATERIALS SCIENCE & ENGINEERING C-BIOMIMETIC AND SUPRAMOLECULAR SYSTEMS
Volume 11, Issue 1, Pages 9-12Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0928-4931(00)00133-8
Keywords
biomimetic structure; fibrous monolithic; laminated; Si3N4/BN composites
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Based on the analysis on structure of natural biomaterials, two binds of ceramic composites with high toughness have been designed and prepared: one is fibrous monolithic Si3N4/BN composite imitating bamboos or trees in structure, the other is laminated Si3N4/BN composite imitating nacre in structure. Plastic forming methods, including extrusion and roll compaction, respectively, followed by hot-pressed sintering are used to prepare these two materials with particular structures. Both of the two composites have high values of fracture toughness and work of fracture: fracture toughness are 24 MPa m(1/2) and 28 MPa m(1/2), respectively, for fibrous monolithic and laminated Si3N4/BN composites, and works of fracture are both more than 4000 J/m(2). The load-displacement curves reveal that these two materials with biomimetic structure exhibit non-brittle feature when applied load to fracture. Through analysis on fractographs of the materials, it is revealed that high toughness comes from the synergistic toughening among multi-level toughening mechanisms in different scales: weak interfaces, whiskers and elongated grains toughening in ceramic matrix cells. (C) 2000 Published by Elsevier Science S.A.
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