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Correlation between Grain Size and Thermal Expansion for Aluminum Titanate Materials
Author(s) -
Parker Fred J.,
Rice Roy W.
Publication year - 1989
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.1151-2916.1989.tb06091.x
Subject(s) - mullite , grain size , materials science , thermal expansion , crystallite , particle size , composite material , aluminium , titanate , mineralogy , grain growth , metallurgy , ceramic , chemical engineering , chemistry , engineering
Al 2 TiO 5 materials were sintered under different conditions to produce different grain sizes. The resultant microcracked materials exhibited a range of bulk thermal expansions which showed a strong correlation with average grain size. An Al 2 TiO 5 average grain size of 3 to 4 μm was the minimum at which the size and population of microcracks effectively reduced the apparent thermal expansion of the polycrystalline material. Further increases in grain size resulted in a rapid drop in the bulk thermal expansion, followed by diminishing decreases with further increases in grain size. Small amounts of phase stabilizers (<2.1 wt% MgO or Fe 2 O 3 ) or limited mullite additions in mullite—aluminum titanate composites had no significant effect on this correlation.