| 浸渗时间对C/C-SiC复合材料显微结构和力学性能的影响 |
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| 引用本文： | 黄沛宇,徐永东,范尚武,张立同,成来飞.浸渗时间对C/C-SiC复合材料显微结构和力学性能的影响[J].固体火箭技术,2009,32(1). |
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| 作者姓名： | 黄沛宇 徐永东 范尚武 张立同 成来飞 |
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| 作者单位： | 西北工业大学,超高温结构复合材料国防科技重点实验室,西安,710072 |
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| 基金项目： | 国家自然科学基金，长江学者创新团队项目 |
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| 摘 要： | 采用反应熔体浸渗法,经不同的浸渗时间渗Si制备了3种不同的C/C-SiC复合材料,测试了材料的增重率、体积密度、断裂韧性及三点弯曲强度,分析了材料的物相组成,并观察了材料的显微结构.结果表明,在得到的C/C-SiC复合材料中,主要存在纳米级和微米级2种尺度的SiC颗粒,随着浸渗时间延长,材料的体积密度和SiC含量随之增加,但抗弯强度随之降低.浸渗时间从0.5 h延长到5 h,材料的密度从2.16 g·cm-3增加到2.21 g·cm-3,SiC的质量百分含量从21.54%增加到31.72%,三点弯曲强度从133 MPa下降到86 MPa,3种复合材料均表现出一种类似于金属材料的非脆性断裂行为,断裂应变约为1.3%,断裂韧性为9～10 MPa·m1/2.
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| 关 键 词： | 浸渗时间 C/C-SiC复合材料 显微结构 力学性能 |
Effect of infiltration time on microstructure and mechanical properties of C/C-SiC composites |
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| HUANG Pei-yu,XU Yong-dong,FAN Shang-wu,ZHANG Li-tong,CHENG Lai-fei.Effect of infiltration time on microstructure and mechanical properties of C/C-SiC composites[J].Journal of Solid Rocket Technology,2009,32(1). |
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| Authors: | HUANG Pei-yu XU Yong-dong FAN Shang-wu ZHANG Li-tong CHENG Lai-fei |
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| Institution: | National Key Laboratory of Thermostructure Composite Materials;Northwestern Polytechnical University;Xi'an 710072;China |
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| Abstract: | By using reactive melt infiltration process,three kinds of C/C-SiC composites were prepared in different infiltration time.Weight gain rate,bulk density,fracture toughness and three-point flexural strength of the C/C-SiC composites were respectively tested,phase composition of the composites analyzed,and microstructure of the composites observed.The results show that there exist mainly two kinds of SiC particles in the C/C-SiC composites,i.e.nano-scale SiC particles and micro-scale SiC particles;with the in... |
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| Keywords: | infiltration time C/C-SiC composites microstructure mechanical property |
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