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Microstructure Development of Zinc Oxide in Hydrogen
Author(s) -
Quadir Tariq,
Readey Dennis W.
Publication year - 1989
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.1151-2916.1989.tb06118.x
Subject(s) - materials science , microstructure , zinc , grain growth , grain boundary , oxide , grain size , phase (matter) , metallurgy , hydrogen , chemical engineering , mineralogy , chemistry , organic chemistry , engineering
Zinc oxide powder compacts with green densities of 60% of theoretical sintered in hydrogen do not densify but exhibit significant grain coarsening. The temperature dependence of the coarsening was greater than that expected from vapor‐phase coarsening models and is close to that obtained for grain growth in dense ZnO. This suggests that the rate of particle coarsening is controlled by grain‐boundary mobility. This possibility was reinforced by the reduction in coarsening with ZnAl 2 O 4 present as a second phase. The results emphasize the importance of controlling grain growth throughout all stages of densification.