CVI-GSI工艺制备C/C-SiC复合材料的组成结构与力学性能 |
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引用本文: | 孙国帅,刘荣军,曹英斌,贺鹏博,龙宪海. CVI-GSI工艺制备C/C-SiC复合材料的组成结构与力学性能[J]. 材料工程, 2017, 0(12): 58-64. DOI: 10.11868/j.issn.1001-4381.2016.000986 |
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作者姓名: | 孙国帅 刘荣军 曹英斌 贺鹏博 龙宪海 |
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作者单位: | 国防科学技术大学航天科学与工程学院 ,长沙,410073 |
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基金项目: | 国防科学技术大学科研计划项目 |
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摘 要: | 采用密度为1.0g/cm~3的C/C素坯,联合化学气相渗透(CVI)和气相渗硅(GSI)2种工艺制备C/C-SiC复合材料,研究CVI C/C-SiC复合材料中间体的密度对CVI-GSI C/C-SiC复合材料物相组成、微观结构及力学性能的影响。结果表明:随着CVI C/C-SiC复合材料中间体密度的增大,CVI-GSI C/C-SiC复合材料C含量增多,残余Si含量减少,SiC含量先增多后减少,CVI-GSI C/C-SiC复合材料的密度先增大后减小;随着CVI C/C-SiC复合材料中间体的密度由1.27g/cm~3增加到1.63g/cm~3时,得到的CVI-GSI C/C-SiC复合材料的力学性能先升高后降低。当CVI C/C-SiC复合材料密度为1.42g/cm~3时,制得的CVI-GSI C/C-SiC复合材料力学性能最好,其弯曲强度为247.50MPa,弯曲模量为25.63GPa,断裂韧度为10.08MPa·m~(1/2)。
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关 键 词: | CVI GSI C/C-SiC复合材料 物相组成 力学性能 |
Structure and Mechanical Properties of C/C-SiC Composites Prepared by CVI-GSI Processes |
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Abstract: | C/C-SiC composites were prepared by the combined process of chemical vapor infiltration (CVI) and gaseous silicon infiltration (GSI) using C/C green body with the density of 1 .0g/cm3 . Effect of CVI C/C-SiC intermediate composites' density on the phase composition ,microstructure and mechanical properties of CVI-GSI C/C-SiC composites was studied .The results show that as the CVI C/C-SiC intermediate composites' density increases ,the residual C content increases and residual Si content decreases in the CVI-GSI C/C-SiC composites ,the SiC content increases first and then decrea-ses ,and the density of CVI-GSI C/C-SiC composites increases first and then decreases;as the CVI C/C-SiC in termediate composites' density is increased from 1 .27g/cm3 to 1 .63g/cm3 ,the mechanical properties of CVI-GSI C/C-SiC composites increase at first ,which then decrease with the further in-creasing of CVI-C/C-SiC composites' density .Specifically ,when the CVI C/C-SiC composites density is 1 .42g/cm3 ,the prepared CVI-GSI C/C-SiC composites has the best mechanical properties ,with flexure strength ,flexure modulus and fracture toughness of 247 .50MPa ,25 .63GPa and 10 .08MPa · m1/2 , respectively . |
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Keywords: | CVI GSI C/C-SiC composites phase composition mechanical property |
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