CVD BN界面层对Si_(3)N_(4)/SiBN复合材料弯曲性能的影响  

Effects of CVD BN Coatings on Flexural Properties of Si_(3)N_(4)/SiBN Composites by Precursor Infiltration Pyrolysis

作　　者：马新 邱海鹏 梁艳媛 刘善华 王晓猛 赵禹良 陈明伟 谢巍杰 MA Xin;QIU Haipeng;LIANG Yanyuan;LIU Shanhua;WANG Xiaomeng;ZHAO Yuliang;CHEN Mingwei;XIE Weijie(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：《材料导报》2021年第S02期86-89,共4页Materials Reports

基　　金：装备预研领域基金(61409220208);国防基础科研计划(JCKYS2019213013)。

摘　　要：连续Si_(3)N_(4)纤维以其优异的热稳定性、高温力学性能和介电性能,被认为是耐高温陶瓷基透波复合材料的候选材料之一。采用连续Si_(3)N_(4)纤维为增强体,以BCl_(3)+NH_(3)+H_(2)+Ar反应体系,利用化学气相沉积工艺在Si_(3)N_(4)纤维表面制备了BN界面层,并以聚硅硼氮烷为陶瓷先驱体,通过先驱体浸渍裂解工艺制备了Si_(3)N_(4)/SiBN复合材料。研究了CVD BN界面层的合成及其对Si_(3)N_(4)/SiBN复合材料弯曲性能的影响。结果表明:在Si_(3)N_(4)纤维表面获得了均匀致密的BN界面层,该界面层有效改善了复合材料中纤维/基体的界面结合力,复合材料显示出典型的韧性断裂特征。当界面层的厚度为200 nm时,Si_(3)N_(4)/SiBN的弯曲强度和断裂韧性分别为182.3 MPa和17.3 MPa·m^(1/2),比无涂层的复合材料分别提高了59.6%和94.4%。Continuous Si_(3)N_(4) ceramic fiber is the candidate as reinforcement in the ceramic matrix composites for high temperature microwave transparent application own to its high thermal stability,mechanical and dielectric properties.Continuous Si_(3)N_(4) ceramic fiber reinforced SiBN ceramic matrix composites were prepared by precursor infiltration pyrolysis(PIP).The effects of CVD BN on the flexural properties of Si_(3)N_(4)/SiBN composites were investigated.The results show a uniform and dense BN coating was obtained.The BN⁃coated Si_(3)N_(4)/SiBN composites exhibits toughness fracture characteristic own the fine interfacial bonding between fiber and matrix.When the thickness of BN coating is 200 nm,the flexural strength and fracture toughness of the Si_(3)N_(4)/SiBN composites were 182.3 MPa and 17.3 MPa·m^(1/2)respectively,which are 59.6%and 94.4%higher than those of the uncoated composites.

关 键 词：连续纤维增强陶瓷基复合材料 化学气相沉积 先驱体浸渍裂解 BN界面层 力学性能 

分 类 号：TB332[一般工业技术—材料科学与工程]