Densification ability of combustion-derived Al2O3 powders

resumo

Nanocrystalline Al2O3 powders containing different amounts of MgO (0.1-5.0 mol%) or added boehmite (AlOOH) have been synthesized by combustion synthesis from aluminium nitrate and magnesium nitrate, using urea or sucrose as fuels. The as synthesized alumina powders were deagglomerated, compacted by dry pressing and sintered at 1625 degrees C for 2 h. For comparison purposes, a commercial high purity alpha-Al2O3 powder (ACC) was also processed following the same route. The sintered materials were characterized for bulk density (BD), apparent porosity (AP), and water absorption (WA) capacity, microstructure using SEM, and XRD phase composition. In comparison to boehmite, the MgO had a considerable effect on the densification behaviour of combustion-synthesized powder. (C) 2008 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

palavras-chave

ALPHA-ALUMINA; NANOCRYSTALLINE ALPHA-AL2O3; MGAL2O4; SPINEL

categoria

Materials Science

autores

Ganesh, I; Torres, PMC; Ferreira, JMF

nossos autores

agradecimentos

IG thanks SERC-DST (Government of India) for awarding BOYSCAST fellowship (SR/BYIE-04/06). The financial support of CICECO is also acknowledged.

Partilhe este projeto

Publicações similares

Usamos cookies para atividades de marketing e para lhe oferecer uma melhor experiência de navegação. Ao clicar em “Aceitar Cookies” você concorda com nossa política de cookies. Leia sobre como usamos cookies clicando em "Política de Privacidade e Cookies".