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Closed Access item Ti-based nanocoatings on Al2O3 powders

Authors:Villegas, Marina
Sierra, T.
Caballero Cuesta, Amador
Fernández Lozano, José Francisco
Keywords:Heterogeneous precipitation, Nanocoatings
Issue Date:2007
Citation:Ceramics International 33 (2007) 875–878
Abstract:Ti-based nanocoatings on ceramic powders were successfully fabricated by heterogeneous precipitation method. Commercial Al2O3 (average particle size of 0.5 mm), titanium tetrabutoxide (Ti(C4H9O)4) and urea (CO(NH2)2) have been used as starting materials. Selecting appropriate precipitation conditions, both the thickness and the uniformity of Ti-based nanocoatings were adjusted.With a molar ratio TiO2/Al2O3 = 0.05 and the use of urea in excess, a homogeneous nanocoating of 20 nm on the alumina powder surface was attained. FTIR spectra indicated the formation of the TiO2-based nanocoating onto Al2O3 particles and TEM examinations showed that the amorphous coating layer crystallized to <10 nm TiO2 particles upon calcination at 500 8C.
Publisher version (URL):http://dx.doi.org/10.1016/j.ceramint.2006.01.017
Appears in Collections:(ICV) Artículos

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