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Influence of Thermal Decomposition on the Mechanical Properties of Magnesia‐Stabilized Cubic Zirconia
Author(s) -
SWAIN MICHAEL V.,
GARVIE RONALD C.,
HANNINK RICHARD H. J.
Publication year - 1983
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.1151-2916.1983.tb10049.x
Subject(s) - monoclinic crystal system , materials science , cubic zirconia , fracture toughness , composite material , toughness , phase (matter) , transmission electron microscopy , flexural strength , crystallography , ceramic , crystal structure , chemistry , nanotechnology , organic chemistry
Cubic magnesia‐stabilized zirconia was decomposed by isothermal heat treatment at 1100°C. The mechanical properties, including strength, fracture toughness, and hardness, were measured at various stages during the decomposition process. The strength initially decreased with aging but then recovered almost to its initial value. This strength decrease was associated with cracking of islands of the cubic phase in the matrix of monoclinic zirconia. The fracture toughness followed the strength although it was found that the monoclinic phase exhibited stable crack growth during notched beam fracture experiments or R ‐curve behavior. Measurements of the hardness indicated that the cubic phase was much harder than the monoclinic phase. In addition, X‐ray diffraction, optical, and transmission electron microscopy studies were made of the decomposition process.