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Viscous Sintering of a Bimodal Pore‐Size Distribution
Author(s) -
SCHERER GEORGE W.
Publication year - 1984
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.1151-2916.1984.tb19506.x
Subject(s) - sintering , shrinkage , materials science , composite material , volume fraction , particle size distribution , volume (thermodynamics) , mineralogy , particle size , chemical engineering , thermodynamics , chemistry , physics , engineering
The cylinder model, used previously to analyze the viscous sintering of flame hydrolysis preforms and gels, is shown to be consistent with other models of early‐ and late‐stage sintering. The model is then applied to a bimodal pore‐size distribution in which the different shrinkage rates of small and large pores produce local stresses. The effect of these stresses on the sintering rate is determined and shown to be substantial. Initially, the small pores accelerate the densification of the large pores; later, shrinkage of the isolated large pores is resisted by the sintered remains of the small pores. Consequently, the time to reach full density is nearly independent of the initial volume fraction of small pores.