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Aluminum Titanate Powder Synthesis via Thermal Decomposition of Transparent Gels
Author(s) -
Mani Themanam Veettil,
Varma Hari Krishna,
Warrier Krishna Gopakumara,
Damodaran Alathoor D.
Publication year - 1991
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.1151-2916.1991.tb07792.x
Subject(s) - boehmite , titanate , materials science , thermal decomposition , thermogravimetric analysis , aluminium , amorphous solid , chemical engineering , titanium , sol gel , decomposition , alkoxide , particle size , mineralogy , ceramic , composite material , metallurgy , chemistry , nanotechnology , crystallography , organic chemistry , catalysis , engineering
Aluminum titanate powder has been prepared through thermal decomposition of a transparent gel formed from a mixture of titanium butoxide and boehmite sol in acetic acid—butanol medium. The thermogravimetric curve of aluminum titanate precursor gel is characterized by a decomposition temperature extending up to 800°C while the constituent gels of boehmite and hydrous titania independently decompose at lower temperature. The removal of water entrapped in the gel structure heated at the above temperature is further made clear by infrared spectral data. The gel stays in the amorphous state up to 800°C, as revealed from XRD. The sintered aluminum titanate shows that grains with sizes above 2 μm are cracked while smaller ones are intact. When heated for a period of 2 h, the gel decomposes to powders with average particle sizes of 2.7 μm at 900°C and 6.5 μm at 1400°C.