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High Toughness Ceramic Laminates by Design of Residual Stresses

Published online by Cambridge University Press:  14 March 2011

Nina A. Orlovskaya ,
Jakob Kuebler ,
Vladimir I. Subotin  and
Mykola Lugovy
Nina A. Orlovskaya
Affiliation:
Department of Materials Engineering, Drexel University, Philadelphia, PA, 19104, U.S.A.
Jakob Kuebler
Affiliation:
Department of High Performance Ceramics, EMPA, Duebendorf, CH-8600, Switzerland
Vladimir I. Subotin
Affiliation:
Institute for Problems of Materials Science, Kiev, 03142, Ukraine
Mykola Lugovy
Affiliation:
Université Catholique de Louvain-la-Neuve, Louvain-la-Neuve, 1348, Belgium
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Abstract

Multilayered ceramic composites are very promising materials for different engineering applications. Laminates with strong interfaces can provide high apparent fracture toughness and damage tolerance along with the high strength and reliability. The control over the mechanical behavior of laminates can be obtained through design of residual stresses in separate layers. Here we report a development of tough silicon nitride based layered ceramics with controlled compressive and tensile stresses in separate layers. We design laminates in a way to achieve high compressive residual stresses in thin (100-150 micron) Si3N4 layers and low tensile residual stresses in thick (600-700 micron) Si3N4-TiN layers. The residual stresses are controlled by the amount of TiN in layers with residual tensile stresses and the layers thickness. The fracture toughness of pure Si3N4(5wt%Y2O3+2wt%Al2O3) ceramics was measured to be of 5 MPa m1/2, while the apparent fracture toughness of Si3N4/Si3N4-TiN laminates was in the range of 7-8 MPa m1/2 depending on the composition and thickness of the layers.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 702: Symposium U – Advanced Fibers, Plastics, Laminates and Composites , 2001 , U8.7.1
Copyright
Copyright © Materials Research Society 2002

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References

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