Effect of the Two-Steps Sintering in the Microstructure of Ultrafine Alumina
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.
Lucio Salgado and Francisco Ambrozio Filho
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