Effect of consolidation technique on the sintering ability and thermal properties of AlN processed from aqueous suspensions
authors Olhero, SM; Ferreira, JMF
editors Vilarinho, PM
nationality International
journal ADVANCED MATERIALS FORUM III, PTS 1 AND 2
author keywords AlN; aqueous processing; slip casting; freeze granulation; sintering
keywords ALUMINUM NITRIDE; CONDUCTIVITY; CERAMICS
abstract In this work, two different consolidation techniques were used to obtain AIN samples: slip casting and dry pressing of granules obtained from aqueous suspensions by freeze granulation. The green samples were sintered at a temperature (1750 degrees C) lower than those usually used (> 1800 degrees C), using CaF2 and YF3 as sintering aids. The microstructural features were analysed by scanning electron microscopy (SEM) and the crystalline phases formed were identified by X-ray (XRD). Full dense AIN-based ceramics were obtained from both consolidation techniques; however the thermal conductivity values were quite different. The presence of carbon in the samples derived from the freeze granulated powder containing organic processing additives de-waxed in an inert atmosphere revealed to be helpful in the cleaning of oxygen present at the grain boundaries and consequently, for enhancing the thermal conductivity.
publisher TRANS TECH PUBLICATIONS LTD
issn 0255-5476
year published 2006
volume 514-516
beginning page 1531
ending page 1535
web of science category Materials Science, Multidisciplinary
subject category Materials Science
unique article identifier WOS:000238056400303

Apoio

1suponsers_list_ciceco.jpg