Zr对聚合物衍生硅硼碳氮陶瓷显微结构和电磁波吸收性能的影响  

Effect of Zr on Microstructure and Electromagnetic Wave Absorption Properties of Polymer-Derived SiBCN Ceramics

作　　者：胡书豪 陈平安[1] 李享成[1] 朱颖丽 朱伯铨[1] HU Shuhao;CHEN Pingan;LI Xiangcheng;ZHU Yingli;ZHU Boquan(The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China)

机构地区：[1]武汉科技大学,省部共建耐火材料与冶金国家重点实验室,高温电磁材料与结构教育部重点实验室,武汉430081

出　　处：《硅酸盐学报》2024年第6期1942-1952,共11页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金项目(51972242);湖北省自然科学基金创新群体项目(2020CFA038);湖北省重点研发计划项目(2020BAA028);湖北省重大项目(2023BAA003)和湖北省青年拔尖人才培养计划。

摘　　要：聚合物衍生Si BCN陶瓷具有良好的分子结构可设计性与高温抗氧化性,是一种极具发展前景的高温电磁波吸收材料。本工作通过向聚硼硅氮烷(PBSZ)中添加锆,制备出了具有多种电介质晶体和非均匀相界面的SiZrBCN复合陶瓷。结果表明,当热处理温度为1 600℃时,陶瓷内部原位生成大量Zr_(2)CN、Si C、Si_(3)N_(4)和石墨碳等晶体。电介质中偶极子转向极化与界面极化协同作用增强了材料对电磁波的吸收能力,使Zr添加量为5%(质量分数)的SiZrBCN陶瓷具有最优异的电磁波吸收性能,当厚度为2.5 mm时陶瓷的最小反射损耗在7.8 GHz达到–21.8 dB。本工作为调控SiZrBCN陶瓷显微结构并增强其电磁波吸收性能提供了新的途径。Introduction With the rapid development of wireless communication and information technology,the electromagnetic wave generated by electronic equipment and communication facilities will cause serious damage to human health and living environment.Electromagnetic wave absorbing materials can convert electromagnetic waves into heat or other forms of energy,which plays an important role in reducing electromagnetic wave pollution.Electromagnetic wave absorbing materials have attracted recent attention.Common electromagnetic wave absorbing materials include magnetic materials and dielectric materials,such as ferrite,magnetic metals,carbon materials(i.e.,carbon nanotubes,graphite carbon,etc.),oxide ceramics(i.e.,zinc oxide,tin oxide,etc.)and silicon carbide,etc..However,these materials are prone to oxidization and impedance mismatch at high temperatures.It is thus important to develop new dielectric materials with intense electromagnetic loss characteristics at high temperatures.Polymer-derived silicon boron carbon nitrogen(SiBCN)ceramics have superior corrosion resistance and high-temperature oxidation resistance,as one of electromagnetic wave absorbing materials that can be applied in harsh environments.However,pure phase SiBCN ceramics have the poor absorption of electromagnetic waves due to their low dielectric constant and low conductivity.At present,in-situ generation or addition of high electromagnetic loss phases are often used to improve the absorption ability of SiBCN ceramics for electromagnetic waves.In this paper,SiZrBCN composite ceramics were prepared via introducing Zr into a polymer-derived SiBCN ceramic precursor.The evolution of the physical phase composition and microstructure of SiZrBCN composite ceramics by Zr addition was investigated,and the effect of physical phase compositions on the electromagnetic wave absorption performance of SiZrBCN ceramics was discussed.Methods Under the condition of ice bath,THF(280 mmol),DCMVS(150 mmol)and(CH_(3))_(2)S·BH_(3)(250 mmol)were injected into a three-necked

关 键 词：聚合物衍生硅锆硼碳氮陶瓷 电介质晶体 极化损耗 电磁波吸收性能 

分 类 号：TQ175.13[化学工程—硅酸盐工业]