硼含量对SiBCN陶瓷显微结构和电磁性能的影响  

Effect of Boron Content on Microstructure and Electromagnetic Properties of SiBCN Ceramics

作　　者：陈平安[1,2] 洪思增 李享成[1,2] 朱颖丽 陈浮 CHEN Pingan;HONG Sizeng;LI Xiangcheng;ZHU Yingli;CHEN Fu(The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China;Key Laboratory of High Temperature Electromagnetic Materials and Structure of MOE,Wuhan University of Science andTechnology,Wuhan 430081,China;School of Information Science and Engineering,Wuhan University of Science andTechnology,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,武汉430081 [2]武汉科技大学高温电磁材料与结构教育部重点实验室,武汉430081 [3]武汉科技大学信息科学与工程学院,武汉430081

出　　处：《硅酸盐学报》2025年第3期607-619,共13页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金项目(52304410、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);湖北省重大科研攻关项目(JD2023BAA003);湖北省青年拔尖人才培养计划。

摘　　要：聚合物衍生陶瓷具有耐高温和介电性能可调等优点,在电磁波吸收材料领域展现出重要的应用潜力。通过调节聚硼硅氮烷中的硼含量,制备了具有优异电磁波吸收能力的SiBCN陶瓷。结果表明,硼能够有效抑制Si—N键的断裂和Si—C键的生成,阻止Si_(3)N_(4)的分解和SiC的生成,并促进非晶碳向石墨碳的转变,提高SiBCN陶瓷中石墨碳的比例。Si_(3)N_(4)、SiC和石墨碳等多种电介质晶体所产生的极化损耗,增强SiBCN陶瓷的电磁波吸收性能。当陶瓷中硼含量为5%(质量分数),厚度为3.5 mm时,最小反射损耗在8GHz处达到-55.67 dB。研究表明,通过调控聚合物陶瓷前驱体的原子组分,可以有效调节SiBCN陶瓷的物相组成和显微结构,对聚合物陶瓷的电磁波吸收性能优化提供了有效方法和策略。Introduction An issue of electromagnetic pollution has escalated with the proliferation of electronic devices,thus posing a significant threat to human health and electronic equipment.Consequently,there is an increasing interest in materials possessing robust electromagnetic wave absorption capabilities.Based on the absorption mechanisms of electromagnetic wave materials,they can be categorized into dielectric loss and magnetic loss types.The loss mechanisms of magnetic loss materials encompass damping and hysteresis losses.Dielectric loss materials absorb electromagnetic waves through polarization and electrical conductivity losses,typically having elevated dielectric constants.Such materials include ferroelectrics,metal oxides,and inorganic ceramics.Polymer-derived ceramics(PDCs)represent a pivotal technology for the design and fabrication of functional ceramics.This methodology effectively harnesses the advantages of both polymer and ceramic materials.In contrast to conventional ceramic preparation techniques that consume energy,PDCs enable the production of ceramic materials with tunable elemental compositions and controllable crystalline structures through meticulous design and synthesis of the molecular structures of polymer precursors,coupled with precise control in the pyrolysis process.In this paper,polyborosilazanes with different boron contents were synthesized via modulating the quantity of added boron source.The impact of boron content on the structure and properties of polyborosilazanes and the phase composition/microstructure of ceramics was investigated.Methods 20 g of n-hexane was added to a reaction flask in ice bath.Methyl dichlorosilane,vinylmethyl dichlorosilane,boron trichloride,and hexamethyldisilane were sequentially added to the reaction flask at different molar ratios.The mixture was stirred in an argon atmosphere for 24 h.The temperature was then raised to 100℃and maintained for 3 h to remove n-hexane and other by-products.Subsequently,the temperature was further increased to 160℃,a

关 键 词：聚合物陶瓷前驱体 分子结构 硅硼碳氮陶瓷 电磁波吸收性能 

分 类 号：TQ174.7[化学工程—陶瓷工业]