作　　者： ; ; ; ;

机构地区： 西北工业大学材料学院碳碳复合材料工程技术研究中心

出　　处： 《西北工业大学学报》 2003年第3期352-355,共4页

摘　　要： 作为理想的热结构材料 ,碳 /碳复合材料 ( C/C)在高温环境下的力学行为至关重要。针对高温处理、高温应用两个环节 ,研究了 2 1 0 0℃石墨化处理、1 70 0℃实验测试条件对三维整体编织 3DC/C复合材料弯曲行为的影响。比较分析后发现 ,高温石墨化处理改变了裂纹扩展路径 ,提高了材料的强度、模量 ;与室温环境相比 ,高温下 C/C复合材料表现出更加优异的弯曲性能 ,弯曲强度提高 45 % ,模量提高 1 5 %。 Three dimensional (3D) braided Carbon/Carbon (C/C) composites made by chemical vapor infiltration (CVI) process, or 3D braided CVI C/C composites, have found widespread use in military aerospace applications. But high temperature mechanical properties cannot, to our best knowledge, be found in the open literature. Subsection 2.1 finds that the graphitization heat treatment, as generally practiced in Chinese research laboratories, can improve the strength and modulus of 3D braided CVI C/C composites under room temperature via altering interface conditions and micro crack distribution in the composites. The test data given in Table 1 show that the mechanical properties of 3D braided CVI C/C composites are higher at a temperature of 1 700℃ than those at room temperature: higher by up to 45% for flexural strength and by up to 15% for flexural modulus of elasticity. The morphology of fracture surface, as can be seen from Fig.4, shows that, under high temperature, strong interface bonding exists between fibers and matrix, thus pointing out that fracture of 3D braided CVI C/C composites exhibits brittle characteristic.

关 键 词： 复合材料 高温力学性能 损伤 界面

领　　域： [一般工业技术]