微正压ICVI制备C/C复合材料的工艺探索  

Experimental Study on Micro-Positive Pressure Icvi for Preparing C/C Composites

作　　者：刘立海[1] 黄启忠[1] 谢志勇[1] 周乐平[1] 王秀飞[1] 欧仕荣 

机构地区：[1]中南大学粉末冶金国家重点实验室,湖南长沙410083 [2]益阳职业技术学院机电与电子工程系,湖南益阳464300

出　　处：《湖南科技大学学报（自然科学版）》2007年第4期42-45,共4页Journal of Hunan University of Science And Technology：Natural Science Edition

基　　金：国家自然科学基金资助项目(50772134);国家重点基础研究发展计划资助项目(2006CB600901)

摘　　要：研究了反应气体浓度对微正压等温化学气相沉积制备的C/C复合材料密度和显微结构的影响,结果表明:在微正压和900℃的沉积条件下,用丙烯作为碳源、针刺毡作为预制体,氮气与丙烯的气体流量比为25∶1,经过105h沉积后,C/C复合材料的密度达到1.52g/cm3;通过偏光显微镜观察分析发现试样外部除了围绕在炭纤维周围的光滑层外,还沉积了大量的再生结构热解炭,试样内部主要以光滑层结构为主.图7,参12.The influence of concentration of reaction gases on the density and microstructure of C/C composites prepared by micro-positive ICVI was studied. Results indicate that using the needle-punched carbon felt as porous preforms, C3H6 as hydrocarbon gas, and under the condition that the current ratio of N2 to C3H6 was 25 ： 1, the temperature was 900 ℃ and the furnace pressure was micro-positive , C/C composite with the density of 1.52 g/cm^3 was reached after 105 hours. Pyrocarbon microstructures were investigated with polarized optical microscope （PLM）. The smooth laminar was obtained in the circumference of carbon fibers and large amounts of regenerative pyrocarbon in the circumference of smooth laminar in the exterior of the sample, the smooth laminar was mainly found in the interior of the sample. 7figs., 12refs.

关 键 词：微正压 化学气相沉积 CIC复合材料 再生结构 

分 类 号：TB332[一般工业技术—材料科学与工程]