Paper Title:

Nanostructure Evolution of ZnO in Ultra-fast Microwave Sintering

Periodical Materials Science Forum (Volume 691)
Main Theme Metastable and Nanostructured Materials IV
Edited by J. Federico Chávez Alcalá, Alejandro Cruz Ramírez and Ma. de los Ángeles Hernández Pérez
Pages 65-71
DOI 10.4028/www.scientific.net/MSF.691.65
Citation Rodolfo F. K. Gunnewiek et al., 2011, Materials Science Forum, 691, 65
Online since June, 2011
Authors Rodolfo F. K. Gunnewiek, Ruth Herta Goldsmith Aliaga Kiminami
Keywords Nanostructure, Nanopowder, Ultra-Fast Microwave Sintering, Zinc Oxide (ZnO)
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Abstract

Grain growth is inevitable in the sintering of pure nanopowder zinc oxide. Sintering depend on diffusion kinetics, thus this growth could be controlled by ultra-fast sintering techniques, as microwave sintering. The purpose of this work was to investigate the nanostructural evolution of zinc oxide nanopowder compacts (average grain size of 80 nm) subjected to ultra-rapid microwave sintering at a constant holding temperature of 900°C, applying different heating rates and temperature holding times. Fine dense microstructures were obtained, with controlled grain growth (grain size from 200 to 450nm at high heating rate) when compared to those obtained by conventional sintering (grain size around 1.13µm), which leads to excessively large average final grain sizes.