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Sintering of Mullite‐Containing Materials: I, Effect of Composition
Author(s) -
SACKS MICHAEL D.,
PASK JOSEPH A.
Publication year - 1982
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.1151-2916.1982.tb10359.x
Subject(s) - mullite , sintering , materials science , liquid phase , diffusion , phase (matter) , grain boundary , mineralogy , composite material , chemical engineering , microstructure , thermodynamics , chemistry , ceramic , physics , organic chemistry , engineering
Sintering behavior of mullite‐containing powders was studied over a range of chemical compositions (Al 2 O 3 /SiO 2 ratio). Densification measurements were made for both liquid phase‐containing and solid state systems. Small amounts of liquid phase were observed to have a significant effect on densification rate. A linear relation was obtained between the percent of theoretical density and the logarithm of time for compositions in the range 73 to 75 wt% Al 2 O 3 . Currently available models for intermediate‐stage sintering kinetics were considered to be inadequate for these systems. Grain‐boundary transport or diffusion appeared to be the primary mechanism of densification.