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Grain‐Boundary Segregation and Final‐Stage Sintering of Y 2 O 3
Author(s) -
JORGENSEN P. J.,
ANDERSON R. C.
Publication year - 1967
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.1151-2916.1967.tb14997.x
Subject(s) - sintering , grain boundary , materials science , grain growth , grain boundary strengthening , grain boundary diffusion coefficient , diffusion , quenching (fluorescence) , indentation hardness , metallurgy , mineralogy , grain size , crystallography , microstructure , thermodynamics , chemistry , fluorescence , physics , quantum mechanics
The addition of ThO 2 to Y 2 O 3 inhibits grain growth during sintering and allows the sintering process to proceed to theoretical density by maintaining a high diffusion flux of vacancies from the pores to the grain boundaries. The inhibition of grain growth is accomplished by the segregation of ThO 2 solute at the grain boundaries, causing a decrease in the grain‐boundary mobility. The segregation of ThO 2 at the grain boundaries can be inferred from the results of the microhardness and grain‐growth studies presented. Further evidence for segregation is provided by quenching experiments and surface activity experiments.