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Effect of Isothermal Heat Treatment on Plasma‐Sprayed Yttria‐Stabilized Zirconia Studied by Impedance Spectroscopy
Author(s) -
Anderson Piers S.,
Wang Xin,
Xiao Ping
Publication year - 2005
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.1551-2916.2005.00088.x
Subject(s) - yttria stabilized zirconia , materials science , cubic zirconia , dielectric spectroscopy , microstructure , scanning electron microscope , isothermal process , composite material , phase (matter) , grain boundary , grain size , metallurgy , ceramic , electrode , chemistry , thermodynamics , physics , organic chemistry , electrochemistry
Impedance spectroscopy (IS) was used to measure electrical responses of various plasma‐sprayed yttria‐stabilized zirconia (YSZ) materials. Coupled with X‐ray diffraction, scanning electron microscopy, and microindentation, the effects of heat treatment on microstructure, phase composition, and mechanical properties were investigated. Results showed electrical responses for YSZ grains and grain boundaries varied with size and position of silver electrodes used. YSZ heat treated at 950°C showed micro‐crack closure: at 1150°C, microstructural and phase changes, and at 1450°C, formation of a resistive monoclinic phase. The aim was to develop that IS as a non‐destructive tool for thermal barrier coatings; results suggest IS can monitor microstructural and phase changes in YSZ under certain conditions.