Microwave Characteristics and Thermal Conductivity of Aluminium Nitride-Molybdenum Lossy Ceramics
Aluminium nitride-molybdenum lossy ceramics were manufactured by hot pressing a mixture of AIN 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 AIN and Mo as well as small amount of yttrium aluminum garnet (Y3Al5O12). With the increase of Mo content,the microwave attenuation characteristic of AIN-Mo composites transfers from wideband attenuation to narrowband attenuation. The sample (AM3),which contained 33wt％ metallic phase dispersedInthe AIN matrix and was sintered at 1850℃,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℃ to 1900℃ The high thermal conductivity is related closely to sintering temperature.
Yuhan Gao Xiaoyun Li Tai Qiu Jian Yang
College of Material Science and Engineering Nanjing University of Technology Nanjing 210009 China
国际会议
2008 International Conference on Microwave and Millimeter Wave Technology(2008国际微波毫米波技术会议)
南京
英文
2069-2072
2008-04-21（万方平台首次上网日期，不代表论文的发表时间）