Effect of Nonstoichiometry on Fracture Toughness and Hardness of Yttrium Oxide Ceramics

This work deals with the changes in mechanical properties of yttrium oxide ceramics induced by nonstoichiometry. The maximum fracture toughness, Klc, is observed at the stoichiometric composition. For an oxygendeficient ceramic, a decrease of Klc is observed from 3.5 to 2.3 MPa.m1/2. On the other ha...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 1989-08, Vol.72 (8), p.1562-1563
Main Authors: Fantozzi, Gilbert, Orange, Gilles, Liang, Kaiming, Gautier, Martine, Duraud, Jean-Paul, Maire, Philippe, Le Gressus, Claude, Gillet, E.
Format: Article
Language:English
Subjects:
360202 - Ceramics, Cermets, & Refractories- Structure & Phase Studies
360203 - Ceramics, Cermets, & Refractories- Mechanical Properties
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
CHALCOGENIDES
CHEMICAL COMPOSITION
Chemical industry and chemicals
CRACK PROPAGATION
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
ELEMENTS
ENERGY BALANCE
Exact sciences and technology
FRACTURE PROPERTIES
fracture toughness
hardness
MATERIALS SCIENCE
MECHANICAL PROPERTIES
NONMETALS
nonstoichiometry
OXIDES
OXYGEN
OXYGEN COMPOUNDS
STOICHIOMETRY
Technical ceramics
TRANSITION ELEMENT COMPOUNDS
yttria
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
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Summary:This work deals with the changes in mechanical properties of yttrium oxide ceramics induced by nonstoichiometry. The maximum fracture toughness, Klc, is observed at the stoichiometric composition. For an oxygendeficient ceramic, a decrease of Klc is observed from 3.5 to 2.3 MPa.m1/2. On the other hand, the Vickers hardness seems to be less dependent on stoichiometry. These results are discussed in the frame of the evolution of the Y‐O bond with the stoichiometry. They set in particular the problem of the role of electrostatic energy stored in a brittle material containing charged defects in the energy balance controlling crack propagation.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1151-2916.1989.tb07708.x