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溶胶-凝胶法在3D-SiC陶瓷表面制备纳米MgO薄膜
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作者 喻亮 马娅娜 +1 位作者 茹红强 岳新艳 《东北大学学报(自然科学版)》 EI CAS CSCD 北大核心 2010年第8期1121-1125,共5页
以Mg(NO3)2.6H2O为原料,无水乙醇为溶剂,胶棉液为表面活性剂,利用溶胶-凝胶法制备了MgO溶胶,并利用浸渍提拉法在三维网络-碳化硅(3D-SiC)陶瓷骨架表面涂覆MgO溶胶,经煅烧制得纳米MgO薄膜.利用X射线衍射仪(XRD)和扫描电子显微镜(SEM)分... 以Mg(NO3)2.6H2O为原料,无水乙醇为溶剂,胶棉液为表面活性剂,利用溶胶-凝胶法制备了MgO溶胶,并利用浸渍提拉法在三维网络-碳化硅(3D-SiC)陶瓷骨架表面涂覆MgO溶胶,经煅烧制得纳米MgO薄膜.利用X射线衍射仪(XRD)和扫描电子显微镜(SEM)分析了薄膜的物相和显微结构.结果表明,利用浸渍提拉法在HF溶液浸蚀后的3D-SiC骨架表面涂覆质量比m(Mg(NO3)2.6H2O)∶m(胶棉液)=1.0的MgO溶胶后,在80℃干燥10 min,再升至480℃干燥10 min,最后800℃煅烧1 h,可制备出致密平整,厚度为0.8~1.0μm的纳米MgO薄膜.薄膜与骨架结合良好,MgO晶粒平均粒径约为500 nm. 展开更多
关键词 纳米mgo薄膜 溶胶-凝胶法 浸渍提拉法 三维网络碳化硅
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Graphite Wrapped FeNi_(3)/Co with Carbon Nanotubes Anchored on MgO@Carbon Fiber Reinforcements via Continuous Fabrication for High-Efficiency Microwave Attenuation 被引量:1
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作者 Chengjuan Wang Haotian Jiang +6 位作者 Xianzhao Cao Xu He Xuanbo Chen Bowen Cui Xiaodan Xu Yanxiang Wang Chengguo Wang 《Advanced Fiber Materials》 SCIE EI CAS 2024年第5期1640-1656,共17页
Carbon fiber(CF)has emerged as a promising candidate for microwave absorbers to resolve the escalating electromagnetic wave(EMW)pollution issue,not just serving as a structural reinforcement.However,the drawbacks,such... Carbon fiber(CF)has emerged as a promising candidate for microwave absorbers to resolve the escalating electromagnetic wave(EMW)pollution issue,not just serving as a structural reinforcement.However,the drawbacks,such as high conductivity,limit its ability to strongly absorb EMWs over a wide bandwidth.To address these challenges,graphite wrapped FeNi_(3)/Co with carbon nanotubes(CNTs)anchored on MgO@CF heterostructures were synthesized by introducing MgO nanofilms on a CF surface and subsequent chemical vapor deposition catalyzed by two-phase catalysts.The synthesis of MgO sup-presses the etching of CF during the experimental processes,effectively maintaining the inherent structure of CF,which is conducive to constructing rich conductive networks and developing excellent mechanical properties.By modulating the catalyst concentration,deposited CNTs with appropriate defects increase the conduction loss and stimulate defect polariza-tion loss.The abundant interfaces formed by multiple components lead to fulfilling interface polarization,while the doping of O heteroatoms causes dipole polarization.In addition,the introduction of FeNi_(3)/Co generates effective magnetic loss and optimizes electromagnetic parameters to form more matching impedance conditions.At a low filler loading of 23 wt%,the stable sample obtains a remarkable minimum reflection loss of up to-72.08 dB at merely 1.38 mm with an effective absorption bandwidth reaching 4.88 GHz at only 1.44 mm,which is superior to that of numerous distinguished carbon-based composites in regard to being“thin,light,wide and strong”.CST simulation reveals that the maximum radar cross section reduction acquires 26.88 dBm2,ascertaining the radar stealth capability of the distinctive heterostructure.Moreover,great mechanical and electromagnetic interference shielding performance is demonstrated by epoxy composites.Henceforth,this study proposes profound insights into the intricate relationship between the structure and EMW absorbing mechanism,and elucidates an attractive strategy for mass-producing modified CF-based hybrids for versatile applications. 展开更多
关键词 mgo nanofilm Heterogeneous structure Microwave absorption Mechanical property Electromagnetic interference shielding
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