In the present study, the sintering behavior of a commercial nano alumina powder with an initial particle size of 100 nm was investigated. The shrinkage response of the powder formed by pressure filtration (PF) during non-isothermal sintering was measured in a laser assisted dilatometer at three different heating rates of 2, 10 and 25 degrees C min(-1) up to 1400 degrees C. In order to calculate the activation energy of sintering, constant rate of heating (CRH) was employed and the activation energy was found to be 608 +/- 20 kJ mol(-1) for iso-density method. The heating rate was demonstrated to have a vital role on densification behavior and final grain size. The mean grain size of the full dense specimens decreased from 875 to 443 nm when the heating rate increased from 2 to 25 degrees C min(-1). (C) 2010 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
Marcel Drabbels, Ulrich Lorenz, Constantin Richard Krüger, Nathan Junior Mowry, Gabriele Bongiovanni
Aleksandra Radenovic, Evgenii Glushkov
Marcel Drabbels, Constantin Richard Krüger, Nathan Junior Mowry