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Kinetics of Mullite Grain Growth in Alumino Silicate Fibers
Author(s) -
Schmücker Martin,
Schneider Hartmut,
Mauer Thomas,
Clauß Bernd
Publication year - 2005
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.1551-2916.2005.00085.x
Subject(s) - mullite , materials science , grain growth , exponent , silicate , grain size , kinetics , atmospheric temperature range , aluminium silicate , mineralogy , composite material , chemical engineering , thermodynamics , chemistry , ceramic , physics , linguistics , philosophy , quantum mechanics , engineering
Grain growth kinetics of mullite in laboratory‐produced and commercial (3M‐Nextel 720) alumino silicate fibers was analyzed in the temperature range between 1500° and 1700°C. The lab fibers consist of mullite plus traces of α‐alumina, while the phase content of the commercial Nextel 720 fibers is about 60 wt% mullite plus 40 wt%α‐alumina. The temperature‐induced grain coarsening of mullite follows the empirical law D 1/ n − D 0 1/ n = kt . Two different temperature regimes can be distinguished with respect to the grain growth exponents: above 1600°C the growth exponent is ≈1/3, while below 1600°C the growth exponent of ≈1/12 is exceptionally low. Laboratory‐produced and commercial fibers show almost identical mullite grain growth kinetics.