碳化硅陶瓷复合材料的制备及其吸波性能研究

Study on the Preparation and the Microwave Absorbing Properties of SiC Ceramic Composites

吸波材料在军用民用领域有重要的价值和意义。本文使用陶瓷结合剂与磁性金属粉末在不同温度下烧结制备出碳化硅陶瓷复合材料,并研究了碳化硅陶瓷复合材料的结构、形貌和吸波性能。在有氧条件下,较低温度(900℃)烧结时,添加磁性金属粉末可以提高碳化硅陶瓷复合材料的吸波性能,对反射波的吸收参数S11可以由−4 dB最大可以降到−7 dB以下。高温(1400℃)下烧结时,金属颗粒周围易氧化,吸波性能提升不明显。

Microwave absorbing materials have important value and significance in military and civil fields. In this paper, silicon carbide ceramic composites were prepared by sintering ceramic bond and magnetic metal powder at different temperatures. When sintered with 900˚C and with the presence of oxygen, the addition of magnetic metal powder enhances the microwave absorbing property of SiC composites. The absorption parameter S11 of reflected wave can be reduced from −4 dB to less than −7 dB. When sintered with 1400˚C, oxide tended to form around metal particles, resulting in no significant promotion of microwave absorbing property.