中文摘要：

针对目前广泛应用的耐烧蚀硅基纤维布增强的复合材料存在的问题，比较了三种不同的硅基纤维布增强酚醛树脂复合材料的高温氧化后的失重率、力学性能和宏观／微观形貌的变化．发现高温氧化后，混编复合材料失重率的变化明显大于单编复合材料失重率的变化；高温氧化后材料的弹性模量随温度升高而减小．在三种硅基纤维布增强的复合耐蚀材料中，单编硅基纤维布增强的复合材料具有更好的抗高温氧化性能．

英文摘要：

Three kinds of ablation-resistant silicon fiber reinforced phenolic resin composite materials were compared in their weight lost rates, mechanical properties, macroscopic and microscopic morphologies after high temperature oxidation. It is found that the weight loss rates of the mixed braided composites are obviously higher than that of the single braided composite after high tempera- ture oxidation. With increasing oxidation temperature the elastic moduli of both the mixed and single braided composites decrease. The single braided composite has the best ablation-resistant property among the three kinds of ablation-resistant silicon fiber reinforced phenolic resin composite materials.