BaTiO_(3)改性对碳/碳复合材料力学性能的影响  

Effect of BaTiO_(3) Modification on Mechanical Properties of Carbon/Carbon Composites

作　　者：王化中 杨宇 夏莉红 尹成 朱学宏 丰雪帆 张福勤[1] WANG Huazhong;YANG Yu;XIA Lihong;YIN Cheng;ZHU Xuehong;FENG Xuefan;ZHANG Fuqin(Powder Metallurgy Research Institute,Central South University,Changsha 410083,China)

机构地区：[1]中南大学粉末冶金研究院,长沙410083

出　　处：《硅酸盐通报》2022年第3期1002-1011,共10页Bulletin of the Chinese Ceramic Society

基　　金：湖南省自然科学基金青年基金(2019JJ50815);中国博士后科学基金(2018M632987)。

摘　　要：以聚丙烯腈(PAN)基碳纤维无纬布和短切网胎纤维交互叠层针刺,在预制体制备过程中掺杂0%、5%、15%、25%和35%五种不同质量分数的BaTiO_(3),制备得到纵向纤维排布环形碳纤维预制体,通过化学气相沉积(CVD)和液相浸渍相结合的方法,制备得到BaTiO_(3)改性碳/碳复合材料。对该复合材料进行垂直和平行两个方向的力学性能测试,并且观察断口处的组织结构及其形貌特征。结果表明,引入纳米BaTiO_(3)后,加快了热解碳形核与生长的过程,改变了热解碳的组织结构,由单一的光滑层组织结构转变为光滑层和粗糙层两种组织结构。随着BaTiO_(3)含量的增加,复合材料的垂直压缩强度先基本不变后逐渐增大,平行压缩强度先增大后减小。复合材料的垂直压缩断裂方式均为脆性断裂,平行压缩断裂方式也均为脆性断裂同时呈现层间断裂的特征。Using polyacrylonitrile(PAN) based carbon fiber weft free cloth and short-cut mesh fiber interactive laminated acupunture,the BaTiO_(3)with different mass fractions(0%,5%,15%,25% and 35%) was introduced in the preparation process to prepare the longitudinal fiber arranged ring carbon fiber preforms.The method of chemical vapor deposition(CVD) and liquid phase impregnation was combined.BaTiO_(3)modified carbon/carbon composites were prepared.The mechanical properties of the composite were tested in both vertical and parallel directions,and the microstructure and morphological characteristics of the fracture were observed.The results show that the introduction of nano-BaTiO_(3)accelerates the nucleation and growth of pyrolytic carbon,and changes the structure of pyrolytic carbon,the single smooth layer is transformed into smooth layer and rough layer.With the increase of BaTiO_(3)content,the vertical compressive strength of the composite is basically unchanged first and then gradually increases,while the parallel compressive strength first increases and then decreases.The fracture mode of the composite under vertical compression is brittle fracture,and the fracture mode under parallel compression is brittle fracture with the characteristics of interlaminar fracture.

关 键 词：碳/碳复合材料 BaTiO_(3) 垂直压缩 平行压缩 脆性断裂 层间断裂 

分 类 号：TB332[一般工业技术—材料科学与工程]