TY - GEN
T1 - Microwave characteristics and thermal conductivity of aluminium nitride-molybdenum lossy ceramics
AU - Gao, Yuhan
AU - Li, Xiaoyun
AU - Qiu, Tai
AU - Yang, Jian
PY - 2008
Y1 - 2008
N2 - Aluminium nitride-molybdenum lossy ceramics were manufactured by hot pressing a mixture of AlN and Mo powders with Y2O3 as sintering aid. The microwave attenuation characteristic was evaluated by network analyzer, and thermal conductivities were measured by laser-flash technique. The results indicate that all samples show densification (open porosity < 0.5%) in the range of sintering temperature. The main crystalline phases of the composites are AlN and Mo as well as small amount of yttrium aluminum garnet (Y3Al5O12). With the increase of Mo content, the microwave attenuation characteristic of AlN-Mo composites transfers from wideband attenuation to narrowband attenuation. The sample (AM3), which contained 33wt% metallic phase dispersed in the AlN matrix and was sintered at 1850°C, possesses the best wideband attenuation property with the maximum attenuation up to 4.5dB. Thermal conductivities improve to over 100 W·m-1·K-1 with the sintering temperature increasing from 1800°C to 1900°C. The high thermal conductivity is related closely to sintering temperature.
AB - Aluminium nitride-molybdenum lossy ceramics were manufactured by hot pressing a mixture of AlN and Mo powders with Y2O3 as sintering aid. The microwave attenuation characteristic was evaluated by network analyzer, and thermal conductivities were measured by laser-flash technique. The results indicate that all samples show densification (open porosity < 0.5%) in the range of sintering temperature. The main crystalline phases of the composites are AlN and Mo as well as small amount of yttrium aluminum garnet (Y3Al5O12). With the increase of Mo content, the microwave attenuation characteristic of AlN-Mo composites transfers from wideband attenuation to narrowband attenuation. The sample (AM3), which contained 33wt% metallic phase dispersed in the AlN matrix and was sintered at 1850°C, possesses the best wideband attenuation property with the maximum attenuation up to 4.5dB. Thermal conductivities improve to over 100 W·m-1·K-1 with the sintering temperature increasing from 1800°C to 1900°C. The high thermal conductivity is related closely to sintering temperature.
UR - http://www.scopus.com/inward/record.url?scp=51149091021&partnerID=8YFLogxK
U2 - 10.1109/ICMMT.2008.4540902
DO - 10.1109/ICMMT.2008.4540902
M3 - 会议稿件
AN - SCOPUS:51149091021
SN - 9781424418794
T3 - 2008 International Conference on Microwave and Millimeter Wave Technology Proceedings, ICMMT
SP - 2069
EP - 2072
BT - 2008 International Conference on Microwave and Millimeter Wave Technology Proceedings, ICMMT
T2 - 2008 International Conference on Microwave and Millimeter Wave Technology, ICMMT
Y2 - 21 April 2008 through 24 April 2008
ER -