高性能SiBN(C)陶瓷纤维的热稳定性能及透波性能  

Thermal stability and wave permeability of high performance SiBN(C)ceramic fibers

作　　者：彭雨晴[1] 牟世伟[2] 韩克清[2] 余木火[2] 李爱军[1] 

机构地区：[1]上海大学复合材料研究中心,上海200444 [2]东华大学材料科学与工程学院,上海201620

出　　处：《复合材料学报》2016年第2期358-365,共8页Acta Materiae Compositae Sinica

基　　金：航空科学基金(2013ZFS6001);上海市科委基础研究重大重点项目(14JC1400100)

摘　　要：SiBN（C）陶瓷纤维因其优异的性能（高温稳定性、高温抗蠕变和高温抗氧化性能等）被认为是高温高性能陶瓷基复合材料的理想增强体。研究了SiBN（C）陶瓷纤维的热稳定性能及微观结构,探索了SiBN（C）陶瓷纤维在1 100-1 500℃的抗氧化过程,并研究了C含量对SiBN（C）陶瓷纤维介电性能的影响。结果表明：SiBN（C）陶瓷纤维在高温热处理至1 600℃的N2气氛下仍然呈现无定形结构;HT-TGA结果表明该SiBN（C）陶瓷纤维具有良好的高温热稳定性,该陶瓷纤维的热失重率（1 450℃,N2气氛）仅为1.5wt%;同时SiBN（C）纤维也表现出优良的高温抗氧化性能,SiBN（C）陶瓷纤维在1 400℃,空气中处理5h后,纤维致密且无裂纹,XRD分析表明SiBN（C）陶瓷仍然呈现无定形结构,1 500℃处理5h后,SiBN（C）陶瓷纤维开始出现皮芯结构,并且出现微晶现象;XRD、SEM和EDX等测试手段表明氧化后样品的表面主要以SiO2微晶形式存在;介电性能研究表明当C含量低至0.1wt%时,SiBN（C）陶瓷纤维的介电常数为2.1,介电损耗为0.001 7（频率为10GHz）。性能评价说明该SiBN（C）陶瓷纤维可满足高温透波材料对增强体的要求。SiBN（C）ceramic fibers have been certificated as a promising candidate for reinforced body in ceramic matrix composites,due to their excellent properties high temperature stability,high temperature creep resistance behavior as well as high temperature oxidation resistance etc.The thermal stability and microstructure of SiBN（C）ceramic fibers were analyzed.Moreover,the high temperature anti-oxidation process of SiBN（C）ceramic fibers was investigated at temperature range from 1 100 ℃ to 1 500 ℃,and the influence of carbon content on the dielectric properties of SiBN（C）ceramic fibers was also investigated.The results show that the SiBN（C）ceramic fibers treated upon thermally heating after 1 600℃in N2 atmosphere retard amorphous structure.The HT-TGA results show that the SiBN（C）caramic fibers have good high temperature thermal stability,and mass loss of the ceramic fibers is only 1.5wt%（1 450 ℃,N2atmosphere）.Furthermore,SiBN（C）ceramic fibers show pronounced high-temperature oxidation resistance.The oxidized ceramic fibers with dense and crack-free structure are observed,moreover,the ceramic fibers still remain amorphous structure after oxidation treatment at 1 400 ℃for 5hin air,whereas the XRD analysis shows that oxidized samples start to occur skin-core structure and crystallize at 1 500 ℃for 5h.Moreover,the results of XRD and SEM associated with EDX show the majority of the oxidated sample surface is the crystallization of cristobalite.The dielectric property investigation of SiBN（C）ceramic fibers show that,dielectric constant and dielectric loss of SiBN（C）ceramic fibers are 2.1and 0.001 7（frequence is 10GHz）,respectively,when the C content is as low as 0.1wt%.The properties evaluation indicate the SiBN（C）ceramic fibers indeed satisfy the requirements that proposed as reinforcement of high temperature wave-transparent materials.

关 键 词：前驱体转变陶瓷 SiBN(C)陶瓷纤维 高温热稳定性 抗氧化性 介电性能 

分 类 号：TQ343[化学工程—化纤工业]