用CVI增密技术制备航空刹车用C/C复合材料  

Fabrication of carbon-carbon composites for aircraft brakes by directional flow thermal gradient chemical vapor infiltration

作　　者：汤中华[1] 邹志强[1] 熊杰[1] 徐惠娟[1] 

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

出　　处：《中南工业大学学报》2002年第4期380-384,共5页Journal of Central South University of Technology(Natural Science)

基　　金：国家重点工业性实验项目(计高科(1998) 1817)

摘　　要：以炭布与炭纤维薄毡交替成叠层 ,采用针刺技术在垂直布面方向引入增强纤维 ,制成准三维预制体 ,在自行研制的热梯度CVI炉中制备了航空刹车用C/C复合材料 ;采用偏光显微镜研究了沉积炭的显微结构 .研究结果表明 :该CVI炉可实现多试样同时沉积 ,且位于料柱不同位置的试样密度分布较均匀 ;对外径为 1 1 0mm ,内径为45mm ,厚度为 1 5～ 2 0mm的试样 ,在 80h内 ,试样的平均密度可达 1 .60g/cm3,炭的有效利用率可达 2 7% ;在料柱的不同位置以及同一试样中沿径向的不同位置 ,沉积炭的显微结构都有所不同 ;沉积炭的显微结构有粗糙层结构、带状结构以及光滑层结构 ;通过工艺参数的优化 。The carbon cloth and carbon fiber felt are laminated alternately and then needled to prepare the porous carbon/carbon preforms, from which the carbon/carbon composites for aircraft brakes are fabricated by the thermal gradient CVI process. Furthermore, the microstructure of the material is studied by polarized light microscopy. The results show that the process allows simultaneous infiltration of multi to preform per run. Porous carbon carbon preforms, 110 mm×45 mm×(15～20) mm can be densified in a one cycle. Uniform carbon carbon disks with the average density of more than 1.60 g/cm 3 are obtained in 80 h. The precursor utilization efficiency can be as high as 27%. It is also found that the microstructure of pyrocarbon matrix varies from rough laminar structure to banded structure to smooth laminar structure along the radial of the disk. And it also varies along the height of the disk column. Through optimizing the infiltration conditions, carbon carbon composites in which the rough laminar microstructure predominates can be obtained.

关 键 词：增密技术 制备 预制体 热梯度 CVI C/C复合材料 粗糙层结构 化学气相渗 航空材料 刹车装置 

分 类 号：V258[一般工业技术—材料科学与工程] V227.7[航空宇航科学与技术—航空宇航制造工程]