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基于酚醛树脂的碳/碳复合材料在高温分解过程的微结构演变

, PP. 37-43

Keywords: 碳/,碳复合材料,酚醛树脂,微观结构,高温分解

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Abstract:

采用热压成型方法制备碳/酚醛树脂预制体,再经高温碳化得到开气孔率为27%、密度约1.27g/cm3并具有预期孔隙结构的碳/碳复合材料。研究了200~900℃预制体转化为碳/碳复合材料过程中,材料的密度、开气孔率、失重率、以及内部微观结构随温度的变化。分析了材料在高温分解过程中微观结构演变规律。结果表明,酚醛树脂主要在400~700℃大量分解,其分解速率约为其余温度范围的4倍,该温度范围失重率增加了14%、开气孔率增加了18%。在高于400℃时形成大量裂纹与孔隙,随着温度升高裂纹增多并进一步扩展,900℃碳化后形成一种连通的特征性微观裂缝网格模式。高温分解后碳/碳复合材料中总孔容约0.17cm3/g,其中81%的孔隙半径在122.190~2.440μm范围内。

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