PIP法制备C/SiOC复合材料的微结构演变与力学性能
Microstructural evolution and mechanical properties of C/SiOC composites prepared by PIP process
查看参考文献17篇
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文摘
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碳纤维增强硅树脂衍生SiOC(C/SiOC)复合材料具有高性价比的优势,是一种应用前景良好的高温结构材料。以碳纤维针刺毡作为增强体,通过先驱体浸渍裂解(precursor infiltration pyrolysis,PIP)工艺制备C/SiOC复合材料。在首周期引入热模压交联工艺,通过优化热模压温度和压力,在不破坏针刺毡结构的前提下,有效提高了纤维体积分数和复合材料致密度,使C/SiOC复合材料的室温弯曲强度和断裂韧度分别提升至331 MPa和16.0 MPa·m~(1/2)。对C/SiOC复合材料的致密化过程的结构演变进行了分析,结果表明,基体优先填充纤维束内孔隙,复合材料的孔隙大部分集中分布在Z向纤维附近。随着制备周期的增加,复合材料的孔隙率逐渐降低,孔隙由连通孔转变为孤立孔。经过8周期“浸渍-交联-裂解”工艺,复合材料基本完成致密化。 |
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其他语种文摘
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Carbon fiber reinforced silicone resin derived SiOC ceramic (C/SiOC) composite is a high-temperature structural material with good application prospect due to its performance/cost ratio. In order to further reduce the cost,carbon fiber needled felt with low price was selected as the reinforcement, and C/SiOC composites were prepared by precursor impregnation pyrolysis (PIP) process. The hot molding process was introduced in the first cycle of PIP route. By optimizing the concentration of precursor solution, molding temperature and pressure, the fiber volume fraction and matrix content in the first cycle were effectively improved without damaging the structure of needled felt. Accordingly, the bending strength at room temperature and fracture toughness of C/SiOC composites were increased to 331 MPa and 16.0 MPa·m~(1/2),respectively. Then the microstructure evolution during the fabrication of C/SiOC composites was evaluated. The results show that SiOC matrix grows in the carbon fiber bundle firstly, then grows from inside to outside of carbon fiber bundle during fabrication. The pores are distributed around Z direction fibers. Porosity of the composites is decreased gradually and pores of the composites transformed from connected ones into isolated ones as the fabrication cycles is increased. When the fabrication cycles reach 8,the porosity of the composites is unchanged basically. At the same time,the densification of composites is completed. |
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来源
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材料工程
,2023,51(8):162-169 【核心库】
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DOI
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10.11868/j.issn.1001-4381.2023.000130
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关键词
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C/SiOC复合材料
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三维碳纤维针刺毡
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热模压
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力学性能
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先驱体浸渍裂解
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地址
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国防科技大学空天科学学院, 新型陶瓷纤维及其复合材料国家重点实验室, 长沙, 410073
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1001-4381 |
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学科
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一般工业技术 |
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基金
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高超声速冲压发动机技术重点实验室基金
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超高温结构复合材料重点实验室基金
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文献收藏号
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CSCD:7629461
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