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Sintering of ZnO: II, Density Decrease and Pore Growth During the Final Stage of the Process *
Author(s) -
GUPTA T. K.,
COBLE R. L.
Publication year - 1968
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.1151-2916.1968.tb15680.x
Subject(s) - sintering , thermal diffusivity , materials science , microstructure , diffusion , grain boundary , grain growth , surface diffusion , zinc , grain size , mineralogy , composite material , metallurgy , thermodynamics , chemistry , adsorption , physics
During the last stage of sintering of ZnO, a decrease in bulk density is accompanied by an increase in pore size and a decrease in the number of pores. Examination of the microstructures indicated that the pores are almost always situated at the grain boundaries and at the corners. The dominant pore size increases with time raised to the 1/3 power. The apparent diffusion coefficients calculated from the pore growth rate are in good agreement with lattice diffusivity for zinc. It is postulated that gas diffusion takes place along the boundaries during pore growth.