| SiC/SiC复合材料的力学性能 |
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| 引用本文： | 于新民,周万城,罗发,郑文景.SiC/SiC复合材料的力学性能[J].航空材料学报,2009,29(3):93-97. |
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| 作者姓名： | 于新民 周万城 罗发 郑文景 |
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| 作者单位： | 西北工业大学,凝固技术国家重点实验室,西安,710072 |
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| 摘 要： | 采用低压化学气相沉积(LPCVD)法制备了具有热解碳界面层的2.5维SiC/SiC复合材料.研究了残余孔洞及热解碳界面层厚度对材料力学性能的影响.结果表明:材料弯曲强度受纤维束之间大孔的影响很小,主要与纤维间的小孔有关,随小孔尺寸和数量的减小而增大.当气孔率低于27%时,小孔的数量和尺寸均变化不大,材料强度提高有限.90nm厚热解碳界面层的存在使材料由破坏性断裂变为非破坏性断裂,强度由174MPa增加到305MPa.进一步增加界面层厚度,纤维受到损伤,材料的力学性能下降.界面层为180nm和310nm厚时SiC/SiC的强度分别为274MPa和265MPa,纤维拔出数量少,材料近似破坏性断裂.
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| 关 键 词： | 力学性能 气孔 界面层 |
Mechanical Properties of SiC/SiC Composites |
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| YU Xin-min,ZHOU Wan-cheng,LUO Fa,ZHENG Wen-jing.Mechanical Properties of SiC/SiC Composites[J].Journal of Aeronautical Materials,2009,29(3):93-97. |
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| Authors: | YU Xin-min ZHOU Wan-cheng LUO Fa ZHENG Wen-jing |
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| Abstract: | 2.5 dimensional SiC/SiC composites with pyrocarbon interlayer were fabricated by low pressure chemical vapor deposition(LPCVD).Effects of residual pores and interlayer thickness on mechanical properties of fabricated SiC/SiC composites were investigated.The flexural strength of the composites is mainly affected by the micro-pores between filaments instead of the macro-pores between yarns.Strength increases with the decrease of the amount and size of micro-pores.When the porosity is below 27%,the further dec... |
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| Keywords: | SiC/SiC |
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