| dc.contributor |
Fundação para a Ciência e a Tecnologia (Portugal) |
|
| dc.contributor |
Ministerio de Ciencia y Tecnología (España) |
|
| dc.creator |
Olhero, Susana M. |
|
| dc.creator |
Miranzo López, Pilar |
|
| dc.creator |
Ferreira, J. M. F. |
|
| dc.date |
2008-07-03T11:57:00Z |
|
| dc.date |
2008-07-03T11:57:00Z |
|
| dc.date |
2006-10 |
|
| dc.date.accessioned |
2017-01-31T02:28:45Z |
|
| dc.date.available |
2017-01-31T02:28:45Z |
|
| dc.identifier |
Journal of Materials Research 21(10): 2460-2469 (2006) |
|
| dc.identifier |
0884-2914 |
|
| dc.identifier |
http://hdl.handle.net/10261/5573 |
|
| dc.identifier |
10.1557/JMR.2006.0301 |
|
| dc.identifier.uri |
http://dspace.mediu.edu.my:8181/xmlui/handle/10261/5573 |
|
| dc.description |
Fully dense aluminium nitride (AlN) ceramics consolidated by aqueous slip casting were obtained after sintering at 1750°C for 2h. 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. |
|
| dc.description |
The first author wishes to thank Fundação para a Ciência e Tecnologia of Portugal for the financial support under Grant No. SFRH/BD/8754/2002. Thanks are also due to Project PRAI-Centro for the financial support. The second author is in debt to Mcyt (Ministery of Science and Technology, Spain) Project No. MAT 2003-06147-C04-01. |
|
| dc.description |
Peer reviewed |
|
| dc.format |
3046434 bytes |
|
| dc.format |
application/pdf |
|
| dc.language |
eng |
|
| dc.publisher |
Materials Research Society |
|
| dc.relation |
http://dx.doi.org/10.1557/JMR.2006.0301 |
|
| dc.rights |
openAccess |
|
| dc.title |
AlN ceramics processed by aqueous slip casting |
|
| dc.type |
Artículo |
|