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Biomimetic Processing of Ceramics and Ceramic-Metal Composites

Published online by Cambridge University Press:  28 February 2011

M. Yasrebi ,
G. H. Kim ,
K. E. Gunnison ,
D. L. Milius ,
M. Sarikaya  and
I. A. Aksay
M. Yasrebi
Affiliation:
Department of Materials Science and Engineering; and Advanced Materials Technology Center, Washington Technology Centers, University of Washington, Seattle, Washington 98195USA
G. H. Kim
Affiliation:
Department of Materials Science and Engineering; and Advanced Materials Technology Center, Washington Technology Centers, University of Washington, Seattle, Washington 98195USA
K. E. Gunnison
Affiliation:
Department of Materials Science and Engineering; and Advanced Materials Technology Center, Washington Technology Centers, University of Washington, Seattle, Washington 98195USA
D. L. Milius
Affiliation:
Department of Materials Science and Engineering; and Advanced Materials Technology Center, Washington Technology Centers, University of Washington, Seattle, Washington 98195USA
M. Sarikaya
Affiliation:
Department of Materials Science and Engineering; and Advanced Materials Technology Center, Washington Technology Centers, University of Washington, Seattle, Washington 98195USA
I. A. Aksay
Affiliation:
Department of Materials Science and Engineering; and Advanced Materials Technology Center, Washington Technology Centers, University of Washington, Seattle, Washington 98195USA
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Abstract

Biomimetic design and processing of laminated B4C-Al cermets, based on knowledge gained from the microstructure-property characterization of abalone shells, is described. In the nacre section of the shell, the microstructure is highly organized as CaCO3 (aragonite) crystals, with a thickness of 0.25 μm, separated by a layer of organic matter 300–500 Å thick. This organization forms a miniature “brick and mortar” microstructure. The resultant strength and fracture toughness of the nacre, i.e., 180 MPa and 7 MPa-m1/2 , are many orders of magnitude higher than those of monolithic CaCO3. The processing of laminated B4C-Al cermets, based on the microstructure of the nacre, was performed by a combination of tape casting of the ceramic and infiltration of the metal. The resultant cermets displayed a 40% increase in both fracture toughness and strength over monolithic B4C-Al cermets.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 180: Symposium A – Better Ceramics Through Chemistry IV , 1990 , 625
Copyright
Copyright © Materials Research Society 1990

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References

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