不同炭基体对炭/炭复合材料力学性能的影响  

Effects of different carbon substrates on mechanical properties of C/C

作　　者：姚成君 樊兆国 赵娜娜 刘文华 YAO Cheng-jun;FAN Zhao-guo;ZHAO Na-na;LIU Wen-hua(Xi'an ChaoMa Technology Co.,Ltd.,Xi'an 710025,China)

机构地区：[1]西安超码科技有限公司,西安710025

出　　处：《炭素》2023年第2期10-14,共5页Carbon

摘　　要：结合化学气相沉积(CVD)和前驱体浸渍裂解工艺,分别以丙烯、糠酮树脂和煤沥青为前驱体制备了密度在1.85g/cm^(3)以上的三维炭/炭(C/C)复合材料,对比研究了沥青炭、热解炭+沥青炭以及热解炭+树脂炭结构(分别为A、B、C组)的等三种不同炭基体C/C复合材料的增密效率与力学性能,采用排水法表征C/C复合材料的孔隙率及密度,利用扫描电镜进行炭基体的微观结构表征,采用万用电子力学试验机进行拉伸强度、压缩强度、剪切强度等力学性能表征。结果表明,在热解炭质量含量相同的前提下,树脂浸渍裂解增密速率低于沥青浸渍裂解工艺,树脂炭基体孔隙率低于沥青炭基体。不同炭基体结构的C/C复合材料力学性能次序为:热解炭+树脂炭双元炭基体最高,纯沥青炭基体次之,热解炭+沥青炭双元炭基体最低,分析原因为热解炭与树脂炭双元炭基体的界面结合强度高,而沥青炭为混乱无序碳结构,热解炭和沥青炭双元炭基体界面结合强度弱,因此力学强度最低。Combining chemical vapor deposition and precursor impregnation pyrolysis processes,three-dimensional C/C composites with a density of over 1.85g/cm^(3) were produced with propylene,furane resins and coal tar pitch as precursors.The densification efficiency,porosity and mechanical properties of C/C composites with different carbon matrix type were compared and studied.The carbon matrix type including pitch carbon,pyrolytic carbon+pitch carbon and pyrolytic carbon+resin,witch marked respectively as group A,group B and group C.While scanning electron microscopy was employed to characterize the microstructure of the carbon matrix.Tensile strength,compressive strength,and shear strength were characterized using a universal electronic mechanical testing machine.The results showed that,with the same content of pyrolytic carbon,the densification rate of resin impregnation pyrolysis was lower than that of pitch impregnation pyrolysis process.Meanwhile,the porosity of resin carbon matrix was lower than that of pitch carbon matrix.According to the mechanical properties of the C/C composites with different carbon matrixes type,the order from high to low is pyrolytic carbon+resin carbon,pure pitch carbon,pyrolytic carbon+pitch carbon.Due to the strong interface bonding strength between pyrolytic carbon and resin carbon,the mechanical strenth was excellent,On the other hand,the disorderly chaotic structure and large number of the defects of the pitch carbon led to the weak interface bonding strength between pyrolytic carbon and pitch carbon,ultimately resulting in the lowest mechanical strenth.

关 键 词：炭/炭复合材料 热解炭 树脂炭 沥青炭 力学性能 

分 类 号：TB332[一般工业技术—材料科学与工程]