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Low‐Temperature Fine‐Grained Alumina–Aluminum Titanate Composites Produced from a Titania‐Coated Alumina Precursor
Author(s) -
Mani Jayasankar,
Ananthakumar Solaiappan,
Mukundan Poothayil,
Warrier Krishna Gopakumar
Publication year - 2007
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.1551-2916.2007.01928.x
Subject(s) - materials science , sintering , microstructure , composite number , titanate , aluminium , composite material , aluminium oxides , alumina ceramic , grain size , ceramic , grain growth , catalysis , chemistry , biochemistry
A method for the preparation of alumina–aluminum titanate (AT) composites, which can be sintered to high density with a fine‐grained microstructure at <1450°C, is reported. The composite precursor is alumina particles coated by sol–gel‐derived titania, which reacts during sintering to form AT in situ at temperature as low as 1300°C. The composite can be sintered at 1350°C to 98% density with 1.5–2.0 μm grain size. Other composites containing 5–50 wt% AT are also investigated.