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Evolution of porous YSZ surface morphology in YSZ‐MnO x system
Author(s) -
Li Na,
Asadikiya Mohammad,
Zhong Yu,
Singh Prabhakar
Publication year - 2018
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.15718
Subject(s) - yttria stabilized zirconia , materials science , porosity , dissolution , morphology (biology) , sintering , precipitation , chemical engineering , porous medium , evaporation , surface diffusion , diffusion , mineralogy , composite material , cubic zirconia , thermodynamics , ceramic , geology , chemistry , adsorption , paleontology , physics , meteorology , engineering
A unique porous YSZ surface morphology is observed and reported, for the first time, during the sintering of YSZ‐MnO 2 composite. The porous YSZ morphology largely depends on YSZ/MnO 2 ratio and sintering temperature, time, and atmosphere. The structural evolution is hypothesized to be due to the presence of Mn especially related to Mn diffusion, dissolution, precipitation, and evaporation. A series of experiments were designed and conducted to investigate the porous morphology formation with emphasis on performing quench experiments that showed the initiation of porous surface evolution during cooling. Computational thermodynamics has been applied to investigate the role of Mn on the surface porosity formation.