Journal of Materials Research and Technology Journal of Materials Research and Technology
J Mater Res Technol 2013;2:18-23 DOI: 10.1016/j.jmrt.2013.03.005
Original Article
Processing and characterization of Al2O3-yttrium aluminum garnet powders
Eduardo de Souza Limaa,, , Luis Henrique Leme Louroa, Ricardo de Freitas Cabralb, José B. de Camposc, Roberto Ribeiro de Avillezd, Célio Albano da Costae
a Instituto Militar de Engenharia (IME), Rio de Janeiro, RJ, Brazil
b Universidade Estadual da Zona Oeste (UEZO), Rio de Janeiro, RJ, Brazil
c Universidade do Estado do Rio de Janeiro (UERJ), Rio de Janeiro, RJ, Brazil
d Materials Engineering Department, Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio/DEMa), Rio de Janeiro, RJ, Brazil
e Instituto Alberto Luiz Coimbra de Pós-Graduação e Pesquisa de Engenharia, Universidade Federal do Rio de Janeiro (COPPE/UFRJ), Rio de Janeiro, RJ, Brazil
Received 19 August 2012, Accepted 16 October 2012
Abstract

Recent studies have shown that Y3Al5O12 (YAG - yttrium aluminum garnet) and Al2O3 composites are chemically stable at high temperatures when produced by unidirectional solidification. In this method, the material is slowly solidified immediately after passing through a melting zone. However, this complexity procession has encouraged other routes. Among them, the usual sintering of Al2O3 and Y2O3 (or YAG) powders. In this present work, Al2O3 and YAG powders were produced using a high-energy milling of Al2O3 and Y2O3 precursor powders followed by a thermal treatment step. These powders were characterized using quantitative XRD techniques, BET, SEM and TEM. The complete YAG formation was obtained at 1,400°C.

Keywords
Al2O3-yttrium aluminum garnet, Composite, Milling, Powders
J Mater Res Technol 2013;2:18-23 DOI: 10.1016/j.jmrt.2013.03.005