模压法制备C/C-SiC复合材料的力学性能  

Mechanical properties of C/C-SiC composites by compression molding

作　　者：熊翔[1] 旷文敏[1] 肖鹏[1] 杨阳[1] 姜四洲[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：《中南大学学报（自然科学版）》2008年第3期486-492,共7页Journal of Central South University:Science and Technology

基　　金：国家"863"计划项目(2006AA03Z560);湖南省杰出青年科学基金资助项目(06JJ10007)

摘　　要：以炭纤维、硅粉、石墨粉等为原材料,采用模压法制备炭纤维增强C/C-SiC复合材料;采用电子万能试验机测定材料抗弯、抗压强度与冲击韧性,利用扫描电子显微镜观察其断口形貌;研究纤维分布状态、纤维长度以及后续炭化处理对C/C-SiC复合材料力学性能的影响。研究结果表明:当分散纤维以单丝状态分布在基体中时,纤维与基体结合紧密,材料力学性能较佳;纤维长度为5 mm时,材料具有较好的综合力学性能,抗弯强度、垂直和平行抗压强度、冲击韧性分别为59.06 MPa,147.03 MPa,134.25 MPa和2.45 kJ/m2;后续炭化处理使材料压缩性能提高22%以上,冲击韧性则有所下降,断裂方式为脆性断裂。C/C-SiC composites were prepared by compression molding with carbon fiber, silicon powder, graphite powder and so on. The effects of fiber dispersion, fiber length and succession carbonization process on mechanical properties were studied with electron omnipotence test equipment, and the fracture morphologies were observed by scanning electron microscopy. The results show that when the distribution of fiber in composites is in single fiber state, the combination of fiber and matrix is compact, and the mechanical properties of composites improve. When the fiber is 5 mm in length, the integrated mechanical properties of composites are better with bending strength 59.06 MPa, compressive strength 147.03 MPa in parallel direction, 134.25 MPa in vertical direction and impact toughness 2.45 kJ/m^2. The compressive strength of composites increases by 22% after successive carbonization process, but the impact toughness decreases slightly, and the fracture model of composites is of brittle fracture.

关 键 词：模压法 炭纤维 C/C-SIC复合材料 力学性能 

分 类 号：TP332[自动化与计算机技术—计算机系统结构]