Effect of the Two-Steps Sintering in the Microstructure of Ultrafine Alumina

Abstract:

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The control of the heating curve to manipulate microstructure during sintering is a way that has being studied and it presents advantages such as simplicity and economy. In this work, it was studied the sintering in two-steps of a commercial ultrafine alumina. For this, the alumina power was deagglomerated in milling ball and the specimens for sintering were pressed. Sintering was performed in a dilatometer, with constant heating rate of 15°C/min up to 1500°C. By these results, heat treatment temperatures for two-step sintering were defined. The sintering specimens were characterized through the apparent density measures using Archimedes method, the grain size measures using image analysis program and microstructural analysis using a scanning electron microscope. The results showed that the two-step sintering influence in the development of the final microstructure and permit the control of the grain size and density.

Info:

Periodical:

Materials Science Forum (Volumes 591-593)

Edited by:

Lucio Salgado and Francisco Ambrozio Filho

Pages:

611-615

DOI:

10.4028/www.scientific.net/MSF.591-593.611

Citation:

A. S. A. Chinelatto et al., "Effect of the Two-Steps Sintering in the Microstructure of Ultrafine Alumina", Materials Science Forum, Vols. 591-593, pp. 611-615, 2008

Online since:

August 2008

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Price:

$35.00

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