Morphological and Structural Analysis of Alfa-Al2O3 Modified with Zr Prepared by Combustion Reaction

M.A.F. Ramalho; Normanda Lino de Freitas; Ana Cristina Figueiredo de Melo Costa; Hélio Lucena Lira; Heloysa Martins Carvalho Andrade; Lucianna Gama

doi:10.4028/www.scientific.net/MSF.591-593.750

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HomeMaterials Science ForumMaterials Science Forum Vols. 591-593Morphological and Structural Analysis of...

Morphological and Structural Analysis of Alfa-Al₂O₃ Modified with Zr Prepared by Combustion Reaction

Abstract:

The addition of zirconia to alumina can improve the chemical properties, mechanical stability, acidity and surface area of alumina. The aim of this work is to evaluate the influence of 0.005 moles of zirconia addition to the structure and morphology of alumina powders by combustion reaction. The compositions were called AP (alpha-Al2O3) and AZ (Zr0.005Al1.995O3) and were prepared by using a silica container with direct heating on a hot plate at 480oC until selfignition. The powders were characterized by X-ray diffraction and nitrogen adsorption by BET analysis. The composition AZ showed high surface area (47 m2/g) and small crystallite size (60 nm). The alpha-alumina AP showed a wide agglomerates distribution with small agglomerates size when compared with AZ composition.