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In Situ Diffraction Study of Self‐Recovery in Aluminum Titanate
Author(s) -
Low ItMeng,
Oo Zeya
Publication year - 2008
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.1551-2916.2007.02199.x
Subject(s) - materials science , eutectic system , rutile , thermal decomposition , atmospheric temperature range , titanate , decomposition , neutron diffraction , thermal expansion , diffraction , chemical engineering , mineralogy , metallurgy , chemistry , thermodynamics , ceramic , microstructure , physics , organic chemistry , optics , engineering
Aluminum titanate (Al 2 TiO 5 ) is an excellent refractory and thermal shock resistant material due to its relatively low‐thermal expansion coefficient and high melting point. However, Al 2 TiO 5 is only thermodynamically stable above 1280°C and undergoes a eutectoid decomposition to α‐Al 2 O 3 and TiO 2 (rutile) in the temperature range of 900°–1280°C. In this paper, we describe the use of high‐temperature neutron diffraction to study the properties of self‐recovery in Al 2 TiO 5 when it is annealed at ≥1300°C in air. It is shown that the process of decomposition in Al 2 TiO 5 is reversible and that self‐recovery occurs readily when decomposed Al 2 TiO 5 is reheated above 1300°C. It is further shown that the existence of a temperature range (900°–1280°C) in which Al 2 TiO 5 is prone to decomposition can be explained by the competing dominance of self‐recovery at ≥1280°C and decomposition at ≤1280°C.