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Role of Grain Boundaries in Sintering.
Author(s) -
BURKE J. E.
Publication year - 1957
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.1151-2916.1957.tb12580.x
Subject(s) - sintering , grain boundary , materials science , grain boundary diffusion coefficient , shrinkage , lattice diffusion coefficient , grain growth , grain boundary strengthening , diffusion , effective diffusion coefficient , impurity , grain size , surface diffusion , metallurgy , composite material , microstructure , chemistry , thermodynamics , medicine , physics , organic chemistry , adsorption , magnetic resonance imaging , radiology
During sintering, grain boundaries act either as sinks or as diffusion paths for lattice vacancies. Thus the configuration of the grain boundaries will have an important effect on the rate of sintering. Grain growth during sintering changes the configuration of grain boundaries relative to pores and thus may markedly influence the shrinkage rate; for example, for uniformly distributed pores the shrinkage rate will increase as the grain size decreases. Impurity additions will increase the sintering rate if they increase diffusion rates, but they may also increase sintering rates by impeding grain‐boundary movement. Some experimental evidence is presented to support these conclusions.