Premium
Grain Growth of Silica‐Added Zirconia Annealed in the Cubic/Tetragonal Two‐Phase Region
Author(s) -
Zhao Jian,
Ikuhara Yuichi,
Sakuma Taketo
Publication year - 1998
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.1151-2916.1998.tb02591.x
Subject(s) - grain growth , materials science , ostwald ripening , grain boundary , eutectic system , grain boundary diffusion coefficient , tetragonal crystal system , cubic zirconia , grain size , amorphous solid , phase (matter) , yttrium , doping , chemical engineering , mineralogy , crystallography , ceramic , metallurgy , microstructure , nanotechnology , crystal structure , chemistry , optoelectronics , organic chemistry , engineering , oxide
The grain growth in silica‐doped 3‐mol%‐yttria‐stabilized tetragonal zirconia polycrystals (SiO 2 ‐doped 3Y‐TZP) and undoped 3Y‐TZP has been examined in the temperature range of 1400°‐1800°C. The presence of a SiO 2 phase inhibits rather than promotes the grain growth in 3Y‐TZP, particularly at high temperatures. During the grain growth in 3Y‐TZP, yttrium ions are partitioned between grains, and the grain growth mechanism can be understood from Ostwald ripening dominated by lattice diffusion of cations. In SiO 2 ‐doped 3Y‐TZP, an amorphous SiO 2 ‐rich phase exists only in the grain‐boundary corners or junctions, not in the grain‐boundary faces. The grain growth in SiO 2 ‐doped 3Y‐TZP is controlled by using different mechanisms below and above the eutectic temperature of the zirconia‐silica (ZrO 2 ‐SiO 2 ) system. The glass phase does not have a major role in grain growth below the eutectic temperature, and the grain growth is dominated by a similar mechanism in undoped 3Y‐TZP. The grain growth is more effectively retarded by the presence of a SiO 2 phase above the eutectic temperature and is likely to be controlled by a solution‐reprecipitation process in the amorphous phase at the grain‐boundary corners or junctions.