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Processing Defects and the Fracture of Ceramics and Designed Ceramic/Ceramic Composites

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Constitutive Laws of Plastic Deformation and Fracture

Part of the book series: Mechanical Behavior of Materials ((MBOM,volume 2))

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Abstract

4.5 wt% Y203-partially-stabilized ZrO2 (YPSZ) four-point bend bars densified by dry-pressing/isostatic pressing/pressureless sintering were fractured and. several fracture origin types were identified. These defects were then classified via their response to various elimination techniques. An elliptical crack model was used to characterize the correlation between fracture stress and fracture origin size. Consistent results showed that an order-of-defect-severity existed, which enabled definition of a “fracture origin severity parameter” for the different origin types. The existence of a relative fracture-origin severity is related to the residual stress fields at the defect-matrix interfaces. The improved strength obtained by secondary processing to eliminate the fracture origin defects did not extend to high temperatures. Efforts were made to improve the strength and toughness of Y-PSZ by incorporation of Na-β-Al2O3 dispersed phase. The mechanical properties of these composites are reported.

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Authors and Affiliations

  1. Ceramic Engineering Research Group Department of Materials Science and Engineering, McMaster University, Hamilton, Ontario, Canada

    Patrick S. Nicholson

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  1. Patrick S. Nicholson
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Editors and Affiliations

  1. Ecole Polytechnique, Montréal, Canada

    J. I. Dickson

  2. National Research Council Canada, Canada

    J.-P. A. Immarigeon  & W. Wallace  & 

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© 1990 Kluwer Academic Publishers

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Nicholson, P.S. (1990). Processing Defects and the Fracture of Ceramics and Designed Ceramic/Ceramic Composites. In: Krausz, A.S., Dickson, J.I., Immarigeon, JP.A., Wallace, W. (eds) Constitutive Laws of Plastic Deformation and Fracture. Mechanical Behavior of Materials, vol 2. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-1968-6_15

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  • DOI: https://doi.org/10.1007/978-94-009-1968-6_15

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-94-010-7380-6

  • Online ISBN: 978-94-009-1968-6

  • eBook Packages: Springer Book Archive

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