Fabrication and Properties of AlN/CNT Composite Ceramics

High thermal conductivity and dense AlN/CNT composite ceramics with additive Y2O3 were fabricated by spark plasma sintered (SPS) in this paper. The results indicated that CNT blocked the densification process in a certain extent, but in the sintering temperature of 1700°C, the relative density of co...

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Bibliographic Details
Published in:Key engineering materials 2012-06, Vol.512-515, p.898-901
Main Authors: Liu, Hai Lin, Tang, Jie, Chen, Yu Feng, Huo, Yan Li, Liang, Hai Long, Li, Yong Li
Format: Article
Language:English
Subjects:
Additives
Aluminum nitride
Ceramics
Density
Heat transfer
Sintering
Thermal conductivity
Yttrium oxide
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Summary:High thermal conductivity and dense AlN/CNT composite ceramics with additive Y2O3 were fabricated by spark plasma sintered (SPS) in this paper. The results indicated that CNT blocked the densification process in a certain extent, but in the sintering temperature of 1700°C, the relative density of composite ceramics were more than 97% with 1-10% volume fractions of CNT. The content of additive Y2O3 affected the thermal conductivity of AlN/CNT obviously. The thermal conductivity of composite material linearly decreased when the content of CNT increased and the tubular structure of CNT had been destructed during once sintering. The effects of the CNT structural damage to the thermal conductivity of composite ceramics were improved by adjusting the sintering process. The thermal conductivity of the composite ceramics with 3% volume fractions of CNT sintering in 1550°C/3min×3 was up to 145W/m•K, which higher than the single-phase AlN ceramics.
ISSN:1013-9826
1662-9795
1662-9795
DOI:10.4028/www.scientific.net/KEM.512-515.898