2D Si_(3)N_(4f)/SiBN热透波复合材料的高温性能研究  

Fabrication of High Performance 2D Si_(3)N_(4f)/SiBN Composites for High-temperature Application

作　　者：邱海鹏 马新 梁艳媛 陈明伟 谢巍杰 王晓猛 赵禹良 QIU Haipeng;MA Xin;LIANG Yanyuan;CHEN Mingwei;XIE Weijie;WANG Xiaomeng;ZHAO Yuliang(AVIC Composite Technology Center,AVIC Manufacturing Technology Institute,Beijing 101300,China;National Key Laboratory of Advanced Composites,Beijing 101300,China)

机构地区：[1]中国航空制造技术研究院复合材料技术中心,北京101300 [2]先进复合材料重点实验室,北京101300

出　　处：《陶瓷学报》2021年第6期1012-1017,共6页Journal of Ceramics

基　　金：装备预研项目(61409220208)。

摘　　要：连续氮化物纤维增强氮化物复合材料在高温下具备优异的力学性能和介电性能稳定性,有希望应用于高超声速飞行器所需的热透波材料。以连续Si_(3)N_(4f)纤维为增强体,化学气相沉积BN为界面层,聚硅硼氮烷(PBSZ)为先驱体,采用先驱体浸渍裂解工艺制备了Si_(3)N_(4f)/SiBN复合材料。研究了复合材料在高温环境中的力学性能与介电性能,结果表明:在900℃以上,氨气气氛裂解时,PBSZ先驱体中的C元素可以被有效去除,其陶瓷产率约为53 wt.%~56 wt.%,其裂解产物中C含量低于0.3 wt.%,Si含量为38.11 wt.%,B元素为7.35 wt.%。Si_(3)N_(4f)/Si BN复合材料的室温弯曲强度为182.3 MPa,1400℃的弯曲强度保留率为44.7%。高温下,纤维的相变是导致复合材料失效的主要原因。介电常数和介电损耗在室温下分别为4.26和4.0×10^(-3),在1200℃时分别为4.89和8.9×10^(-3)。Continuous nitride fiber reinforced nitride matrix composite has been recognized as a promising microwave transparent radome material.2D silicon nitride fiber fabric reinforced silicon boronitride ceramic composites were prepared through polyborosilazane precursor infiltration pyrolysis routine using polyborosilazanes(PBSZs)as the precursor of Si BN.Properties of the composites at elevated temperatures were measured,including strength,dielectric constant and loss tangent.After pyrolysis at above 900℃ in ammonia atmosphere,C element in the PBSZ precursor was effectively removed.The ceramic yield was 53-56wt.%,with contents of C,Si and B to be less than 0.3 wt.%,38.11 wt.% and 7.35 wt.%,respectively.The bending strength at room temperature was 182.3 MPa,which was retained by 44.7% at 1400℃.Phase transformation of the fiber is responsible for the failure of the composites at high temperatures.The composites displayed a low dielectric constant of 4.26 and a low loss tangent of 4×10^(-3) at room temperature,which were increased to 4.89 and 8.9×10^(-3) at 1200℃.

关 键 词：陶瓷基透波复合材料 先驱体浸渍裂解 力学性能 介电性能 

分 类 号：TQ174.75[化学工程—陶瓷工业]