| 纤维含量对Cf/SiC复合材料力学性能和断裂机理的影响 |
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| 引用本文： | 张云龙,张宇民,赵晓静,韩杰才.纤维含量对Cf/SiC复合材料力学性能和断裂机理的影响[J].兵器材料科学与工程,2008,31(1):39-42. |
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| 作者姓名： | 张云龙 张宇民 赵晓静 韩杰才 |
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| 作者单位： | 哈尔滨工业大学,复合材料与结构研究所,哈尔滨,150001;哈尔滨工业大学,复合材料与结构研究所,哈尔滨,150001;哈尔滨工业大学,复合材料与结构研究所,哈尔滨,150001;哈尔滨工业大学,复合材料与结构研究所,哈尔滨,150001 |
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| 摘 要： | 为实现碳化硅复合材料减重和增韧的双重目的,以Al2O3和Y2O3为烧结助剂,利用真空热压烧结工艺制备了短切碳纤维增强碳化硅复合材料。结果表明:烧结过程中,烧结助剂Al2O3、Y2O3之间发生化学反应,促进液相烧结,形成晶界间的次晶相YAG(3 Y2O3.5Al2O3),有利于提高复合材料的断裂韧性;在较高烧结温度下,碳纤维、烧结助剂与基体间发生反应,形成较强结合界面;纤维拔出、裂纹偏转和晶粒桥联是碳化硅陶瓷的主要增韧机制。
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| 关 键 词： | 纤维增强 微观结构 力学性能 增韧机制 |
| 文章编号： | 1004-244X(2008)01-0039-04 |
| 修稿时间： | 2007年3月25日 |
Effect of fiber content on mechanical property and fracture mechanisms of Cf/SiC composites |
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| ZHANG Yun-long,ZHANG Yu-min,ZHAO Xiao-jing,HAN Jie-cai.Effect of fiber content on mechanical property and fracture mechanisms of Cf/SiC composites[J].Ordnance Material Science and Engineering,2008,31(1):39-42. |
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| Authors: | ZHANG Yun-long ZHANG Yu-min ZHAO Xiao-jing HAN Jie-cai |
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| Abstract: | The Cf/SiC composites were prepared by hot pressing sintering with Al2O3 and Y2O3 as additives.Results show that chemical reaction between additives Al2O3 and Y2O3 accelerated the liquid phase sintering and the formation of the YAG non-crystalline,which was beneficial to improving fracture toughness of Cf/SiC composites.Higher sintering temperature resulted in the strongly bonded fiber/matrix interface.Fiber push-off,crack deflection and grains bridging are main toughening mechanisms of silicon carbide ceramic. |
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| Keywords: | fiber reinforcement microstructures mechanical property toughening mechanisms |
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