碳纤维增强C-SiC梯度基复合材料研究  

The Studies of C/C-SiC Gradient Matrix Composites

作　　者：刘文川[1] 邓景屹[1] 魏永良[1] 

机构地区：[1]中国科学院金属研究所材料疲劳与断裂国家重点实验室,沈阳110015

出　　处：《高技术通讯》1997年第4期1-6,共6页Chinese High Technology Letters

基　　金：863计划资助

摘　　要：采用CVI工艺均热法共沉积技术制备了碳纤维增强C－SiC梯度基复合材料。C和SiC的原料气体分别是C2H2和CH3SiCl3，Ar和H2分别是载流和稀释气体。基体微观结构的变化通过控制原料气体的成分配比获得。测试了材料的力学性能、抗氧化性能和摩擦磨损性能。利用金相技术、电子探针成分分析技术、TEM和SEM技术观察和分析了材料的微观结构。试验结果表明，这种材料的组织结构特点是：在微观上是梯度的，即围绕着纤维的基体成分连续地从碳变化到SiC；在宏观上，它属于均质的热结构复合材料。弥散在基体中的SiC起到基体改性的作用，基体壳层外边的SiC起到涂层的作用，因此它的抗氧化性能明显优于C／C材料。C-SiC Gradient Matrix Composites (GMCs) have been prepared by CVI with C and SiC cedeposition.CH3SiCl3 liquid and C2H2 gas are used as the sources, and Ar and H2 gases are used as the carrier and dilutant gases, respectively. The GMCs have been achieved through the compositions of source gases gradually varying from C2H2 to CH3SiCl3 in the continuous process. Oxidation resistance, wear and mechanical testing are carried out and the microstructures are observed by optical microscopy, electron-probe microanalysis,TEM and SEM. These results show that, macroscopically, this material is homogeneous but microscopically, the matrix composites around each fiber vary continuously, and the oxidation resistance of the material is significantly superior over C/C material because SiC particles are incorporated into carbon matrix as an inhibitor and finally SiC coating is formed on the outside of matrix sheaths to protect carbon surface from oxidation. This is one of the most promising thermostructural materials owing to its lowdensity, better mechanical properties and good resistance to oxidation.

关 键 词：梯度基复合材料 结构与性能 化学气相渗 共沉积 

分 类 号：TB332[一般工业技术—材料科学与工程]