AIN ceramics processed by aqueous slip casting
authors Olhero, SM; Miranzo, P; Ferreira, JMF
nationality International
journal JOURNAL OF MATERIALS RESEARCH
keywords ALUMINUM NITRIDE POWDER; THERMAL-CONDUCTIVITY; ALN CERAMICS; SINTERING AIDS; YF3; HYDROLYSIS; DISPERSION
abstract Fully dense aluminium nitride (AlN) ceramics consolidated by aqueous slip casting were obtained after sintering at 1750 degrees C for 2 h. The obtained samples were characterized by Vickers hardness (1000 Hv), flexural strength (200 MPa) and thermal conductivity (115 W/mK). YF3 and CaF2 were used as sintering additives in total amounts ranging from 5 to 7 wt% in YF3/CaF2 weight ratios of 1.25, 1.5, and 2. The compatibility between the thermochemically treated AlN powder and the sintering additives in the aqueous suspensions was investigated by theological and zeta potential measurements. Highly concentrated (50 vol%) and well-dispersed suspensions could be prepared and used to consolidate homogeneous green bodies by slip casting. The phosphate species used to protect the surface AlN particles against hydrolysis could no longer be detected at temperatures higher than 1400 degrees C. X-ray diffraction results revealed that all the new crystalline phases formed upon sintering belong to the system Al-Y-O-Ca, but their specific compositions as well as the thermal properties of the sintered materials were shown to depend on the total amount and ratio of sintering aids.
publisher CAMBRIDGE UNIV PRESS
issn 0884-2914
year published 2006
volume 21
issue 10
beginning page 2460
ending page 2469
digital object identifier (doi) 10.1557/JMR.2006.0301
web of science category Materials Science, Multidisciplinary
subject category Materials Science
unique article identifier WOS:000241021600005
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journal analysis (jcr 2019):
journal impact factor 2.502
5 year journal impact factor 2.251
category normalized journal impact factor percentile 49.841
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