三维整体编织物增强陶瓷基复合材料的制备工艺及性能表征  

STUDY OF THE PROPERTY AND PROCESSING OF CERAMIC MATRIX COMPOSITES REINFORCED WITH 3D-BRAID WOVEN FABRICS

作　　者：郑文伟[1] 王兴业[1] 刘风荣 肖加余[1] 江大志[1] 

机构地区：[1]湖南长沙国防科技大学五系,长沙410073

出　　处：《复合材料学报》1997年第1期48-53,共6页Acta Materiae Compositae Sinica

摘　　要：本文研究了以连续碳纤维(C_f)三维整体编织物(3D-B)为增强体,以聚碳硅烷(PCS)裂解转化成碳化硅(SiC)为基体的陶瓷基复合材料(CMC)的制备工艺,探讨了不同工艺方法对复合材料微观和宏观性能的影响,并提出进一步改善制各工艺,提高复合材料性能的途径。研究结果表明,采用聚碳硅烷/二乙烯基苯(PCS/DVB)体系浸渍经交联固化后可以大大缩短裂解时间,致密化效率较聚碳硅烷/二甲苯溶液(PCS/Xylene)体系有着显著提高。对于3D-B C_f/SiC CMC用PCS╱DVB体系浸渍经7个浸渍裂解周期后试样密度为1.65g/cm^3,弯曲强度达326MPa,断裂韧性K_(IC)为13.72MPa·m^(1╱2);用PCS/Xylene体系浸渍的试样密度为1.54g╱cm^3,弯曲强度为243MPa,断裂韧性K_(IC)为8.19MPa·m^(1╱2)。研究中利用扫描电镜观察了弯曲试样的断口以分析材料破坏时纤维的断裂、拨出形貌。The processing of Ceramic Matrix Composites (CMC) reinforced with 3D-braid woven fabrics via polycarbosilane (PCS) pyrolysis was investigated. Also studied were the influences of different kinds of processing on the macro and micro properties of composites. Several ways were proposed, which can improve the processing and enhance the properties of composites. The results indicate that the pyrolysis time is considerably reduced by infiltration-curing-pyrolysis of a PCS/DVB system, and the densification efficiency is significantly enhanced compared with PCS/Xylene solution infiltration. The 3D-braid C_f/SiC CMC specimens have a density of 1. 65g/cm^3, a flexural strength of 326MPa and a fracture toughness of 13.72MPam^(1/2) after infiltration-curing-pyrolysis cycles of 7 times for the PCS/DVB system, and have a density of 1.54g/cm^3, a flexural strength of 243MPa and a fracture toughness of 8.19MPam^(1/2) after infiltration pyrolysis for the PCS/Xylene system. The fracture surfaces of the flexural specimens were also investigated by SEM including fibers pull-out, fibers fracture, etc.

关 键 词：陶瓷 复合材料 三维编织物 先驱体转化法 

分 类 号：TQ174.758[化学工程—陶瓷工业] TB332[化学工程—硅酸盐工业]