聚合物转化SiBN系陶瓷组分对其热稳定性及电磁透波性能的影响  

Effect of polymer derived SiBN ceramic components on thermal stability and electromagnetic wave transparency

作　　者：崔雪峰 王俊珩 张聪琳 成来飞[1] 叶昉[1] 刘持栋[1] CUI Xuefeng;WANG Junheng;ZHANG Conglin;CHENG Laifei;YE Fang;LIU Chidong(Science and Technology on Thermostructural Composite Materials Laboratory,Northwestern Polytechnical University,Xi'an 710072,China)

机构地区：[1]西北工业大学超高温结构复合材料重点实验室,西安710072

出　　处：《复合材料学报》2023年第11期6416-6429,共14页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(52072304,51872229);国家111项目(B08040);ND基础研究基金(G2022WD)。

摘　　要：对聚硅硼氮烷(PSNB)、三甲胺环硼氮烷(PBN)及混合先驱体陶瓷化过程分别进行了研究,掌握了热处理温度对先驱体转化陶瓷微结构及性能的影响规律。经NH_(3)裂解后,聚合物转化陶瓷(PDC)-SiBN中形成了B-Si-O-N多元网络,具有良好的抗析晶能力,经过不超过1500℃的热处理后,陶瓷抗吸潮能力提升,介电常数在3.0~3.6之间,损耗约0.003。经NH_(3)裂解的PDC-BN中形成了B-N-O结构,随温度升高逐渐分解,转变为BN。将先驱体按照一定比例混合,可以实现对聚合物转化陶瓷元素组分的调控。混合先驱体转化陶瓷中由于异质界面的存在及多元网络减少,陶瓷热稳定性及介电性能均介于单种先驱体转化陶瓷之间,具有一定的性能可设计性。The ceramization process of polyborosilazane(PSNB),tris(methylamino)borane(PBN)and mixed precursors were studied respectively,and the influence of heat treatment temperature on the microstructure and properties of polymer derived ceramics was mastered.After pyrolysis under NH_(3),the B—Si—O—N multielement network was formed in PDC-SiBN,which had good crystallization resistance.After heat treatment at less than 1500℃,the moisture resistance of ceramics was improved,the dielectric constant was between 3.0 and 3.6,and the loss was about 0.003.After pyrolysis under NH_(3),the B—N—O structure was formed in PDC-BN,which gradually decomposed into BN with the increase of temperature.The precursor can be mixed in a certain proportion to control the elements of polymer derived ceramics.Due to the existence of heterogeneous interfaces in the mixed precursor derived ceramics,the multiple networks were reduced.The thermal stability and dielectric properties of mixed polymer derived ceramics are between those of single polymer derived ceramics,which have certain performance designability.

关 键 词：聚合物转化陶瓷 电磁透波 热稳定性 聚硅硼氮烷 三甲胺环硼氮烷 

分 类 号：TB332[一般工业技术—材料科学与工程]