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Low‐temperature aging of baddeleyite‐based Ca‐ TZP ceramics
Author(s) -
Zhigachev Andrey O.,
Umrikhin Alexey V.,
Korenkov Viktor V.,
Golovin Yuri I.
Publication year - 2017
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/jace.14844
Subject(s) - baddeleyite , kinetics , cubic zirconia , materials science , activation energy , nucleation , ceramic , tetragonal crystal system , mineralogy , chemical engineering , composite material , thermodynamics , chemistry , crystallography , crystal structure , geology , quantum mechanics , engineering , zircon , paleontology , physics
Abstract The aging kinetics during low‐temperature aging of calcia‐stabilized tetragonal zirconia polycrystal (Ca‐ TZP ) ceramics prepared by high‐energy milling of natural zirconia mineral (baddeleyite) was studied by X‐ray diffraction under hydrothermal treatment conditions. Aging kinetics was investigated for ceramics with different contents of calcia. It was found that the kinetics may be well‐described within Johnson‐Mehl‐Avrami‐Kolmogorov model. Model parameters were determined by data fitting procedure. Change in exponential factor within Johnson‐Mehl‐Avrami‐Kolmogorov model with time is shown. Analytical model to describe aging kinetics is proposed. The transformation nucleation rate, initial diameter, and depth of the transformed areas and their growth rates are estimated. Degradation of hardness and fracture toughness is also reported for Ca‐ TZP after low‐temperature aging for different contents of the stabilizer.