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Design and Fracture of Layered Al 2 O 3 /TZ3Y Composites Produced by Electrophoretic Deposition
Author(s) -
Hatton Benjamin,
Nicholson Patrick S.
Publication year - 2001
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2001.tb00700.x
Subject(s) - materials science , composite material , deflection (physics) , residual stress , fracture mechanics , electrophoretic deposition , fracture toughness , cubic zirconia , vickers hardness test , flexural strength , ceramic , microstructure , physics , optics , coating
Alumina/yttria‐stablized tetragonal zirconia (Al 2 O 3 /TZ3Y) multilayer composites with strong interfaces and containing residual stresses were produced by electrophoretic deposition. As‐synthesized and Vickers‐indented samples with different layering designs have been tested in bending (up to 1300°C) to experimentally define conditions for crack deflection and flaw tolerance. The compressive residual stress in the Al 2 O 3 layers (ς r ) is a function of layer thickness ( t ). It was found that the parameter ς r 2 t is an effective indicator of the fracture behavior, as predicted by strain energy release calculations. With decreasing ς r 2 t , the fracture followed a sequence from spontaneous delamination, multistage fracture with extensive crack deflection, to catastrophic failure with, and finally without, deflection steps. Decrease of ς r with increasing test temperature causes changes in fracture behavior which correspond to the room‐temperature transitions of ς r 2 t .