摘要
以正丁醇为前躯体,N2为载气和稀释气,以2D炭毡为预制体,在负压和沉积温度为1 150℃的实验条件下,采用等温化学气相渗透(ICVI)工艺制备出C/C复合材料制品,讨论了沉积时间与密度的变化规律以及预制体内部密度分布规律。利用三点弯曲测定了材料的弯曲强度,采用偏光显微镜、扫描电镜观察了材料的组织结构和断口形貌。结果表明,试样的组织结构以具有靠近纤维部分为中织构热解炭组织,外部为高织构热解炭组织特征,断裂方式为假塑性断裂,并且具有优异的力学性能。研究表明丁醇中氧元素的存在并未在高温下对炭纤维产生腐蚀破坏作用,正丁醇可以作为前躯体中的一种组分用于CVI工艺热解制备高性能C/C复合材料。
Taking the n-butyl alcohol as precursor,N2 as diluting gas,and 2D carbon fiber felt as preform,the carbon/carbon（C/C） composite samples were prepared by using chemical vapor infiltration（CVI） method at the depositing temperatures of 1 150 ℃.Variation law between depositing time and density as well as density distribution law in the preform was discussed.Three-point flexure was used to measure flexural strength of the material,and Polarized Light Microscopy（PLM）,Scanning Electron Microscopy（SEM） used to observe structure and section morphology.The results show that medium-textured pyrolytic carbon is deposited as the first layer near the carbon fibers,while high-textured pyrolytic carbon deposited as second layer around first layer.Bending test shows that the C/C samples present pseudo-plastic fracture behavior and has excellent mechanical properties.This investigation results show that n-Butyl alcohol is a promising precursor in CVI process for the densification of high performance C/C composites.
出处
《固体火箭技术》
EI
CAS
CSCD
北大核心
2010年第6期694-697,共4页
Journal of Solid Rocket Technology
基金
国家自然科学基金:(50972120)
西北工业大学基础研究基金(W018109)
凝固技术国家重点实验室基金(G8QT0222)
