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AlN ceramics processed by aqueous slip casting

Published online by Cambridge University Press:  03 March 2011

S.M. Olhero ,
P. Miranzo  and
J.M.F. Ferreira
S.M. Olhero
Affiliation:
Department of Ceramics and Glass Engineering, Centro de Investigação em Materiais Cerâmicos e Compósitos, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal
P. Miranzo
Affiliation:
Instituto de Cerámica y Vidrio, Consejo Superior de Investigaciones Cientificas CSIC, Campus de Cantoblanco, 28049 Madrid, Spain
J.M.F. Ferreira*
Affiliation:
Department of Ceramics and Glass Engineering, Centro de Investigação em Materiais Cerâmicos e Compósitos, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

Fully dense aluminium nitride (AlN) ceramics consolidated by aqueous slip casting were obtained after sintering at 1750 °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 rheological 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 °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.

Keywords

Powder processingScanning transmission electron microscopy (STEM)Thermal conductivity
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 10 , October 2006 , pp. 2460 - 2469
Copyright
Copyright © Materials Research Society 2006

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