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Surface Nitridation of Yttria‐Doped Tetragonal Zirconia Polycrystals (Y‐TZP): Microstructural Evolution and Kinetics
Author(s) -
Chung TaiJoo,
Lee JongSook,
Kim DohYeon,
Song Huesup
Publication year - 1999
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.1151-2916.1999.tb02223.x
Subject(s) - materials science , equiaxed crystals , nucleation , microstructure , cubic zirconia , tetragonal crystal system , zirconium nitride , zirconium , yttria stabilized zirconia , nitride , composite material , mineralogy , metallurgy , layer (electronics) , crystallography , ceramic , crystal structure , chemistry , titanium nitride , organic chemistry
Sintered tetragonal‐zirconia polycrystals (TZP) were embedded in a zirconium nitride powder bed and heat‐treated at various temperatures. Surface layers of the TZP specimens were transformed to a stabilized cubic‐zirconia by nitrogen incorporation, and their thickness was observed to increase by a parabolic rate law. The nitrogen diffusivity was evaluated from the temperature dependence of the nitridation rate. The microstructure of the nitrided layer was composed of different zones of equiaxed and columnar grains. The columnar grains were developed along the nitrogen flux lines. The observed microstructural evolution was explained in terms of nucleation and growth kinetics of nitridation.