【作者】 杨朝翔； 邓瑞翔； 张涛； 宋力昕；

【Author】 YANG Zhaoxiang;DENG Ruixiang;ZHANG Tao;SONG Lixin;Shanghai Institute of Ceramics,Chinese Academy of Sciences;University of Chinese Academy of Sciences;

【机构】 中国科学院上海硅酸盐研究所； 中国科学院大学；

【摘要】 随着世界新军事革命的加速推进,发展高温宽频吸波材料技术成为破解目前飞行器全方位隐身难题的重要技术路径。通过引入人工周期性结构单元作为频率选择表面（FSS）,是实现宽频雷达吸波的优选技术方案。但耐高温频率选择面的实现依赖于电阻精准可控、高温服役稳定的高温导电涂层。本研究基于正负"补偿效应",采用具有负电阻温度系数、耐高温、抗氧化且低成本的镧锶锰氧（LSMO）和具有正电阻温度系数的银作为导电相,与玻璃相、有机载体进行混合来制备导电浆料。结合丝网印刷技术制备的FSS,通过调整烧结温度与保温时间实现了涂层方阻值在10^-1～10²数量级的调控,并在500℃～950℃范围内使方阻稳定在20.7Ω/□左右,为进一步制备结构一体化耐高温宽频吸波超材料垫定了坚实的技术支撑。更多还原

【Abstract】 With the acceleration of new military revolution in the world,the development of high-temperature broadband absorbing material technology has become an important technical path to solve the current all-round stealth problem of aircraft.By introducing artificial periodic structural units as frequency selective surfaces（FSS）,it is the preferred technical scheme to realize broadband radar absorption.However,the realization of high temperature resistant frequency selective surface depends on the high temperature conductive coating with precise controllable resistance and stable high temperature service.Therefore,based on the positive and negative ’compensation effect’,lanthanum strontium manganese oxide（LSMO） with negative resistance temperature coefficient,high temperature resistance,oxidation resistance and low cost and silver with positive resistance temperature coefficient were used as conductive phases,which mixed with glass phase and organic carrier to prepare conductive paste.Combined with the FSS prepared by screen printing technology,the sheet resistance of the coating is controlled in the range of 10^-1～10² by adjusting the sintering temperature and holding time,and the sheet resistance is stabilized at about 20.7Ω/□ in the range of 500℃～950℃,which provides a solid technical support for the further preparation of structurally integrated high-temperature broadband absorbing metamaterials.更多还原