采用ＸＲＤ，ＨＲＴＥＭ 和ＳＥＭ 等分析测试手段，研究了以聚碳硅烷（ＰＣＳ）为先驱体和粘结剂，Ｙ２Ｏ３ 和ＡｌＮ 为烧结助剂，采用先驱体转化－热压烧结法制备的Ｃｆ／ＳｉＣ复合材料的显微结构。结果表明，Ｙ２Ｏ３ 主要与ＰＣＳ的裂解产物以及ＡｌＮ 和ＳｉＣ表面的氧化物发生反应，形成有助于复合材料致密化的液相，而ＡｌＮ 则与烧结液相和ＰＣＳ之间通过反应－ 溶解－ 沉积过程，形成主要分布于界面相中的微小ＳｉＣ－ＡｌＮ 固溶体。正是由于含有一定量ＳｉＣ－ＡｌＮ 固溶体的富碳界面相使纤维与基体之间的结合适中，纤维易发挥脱粘和拔出作用，复合材料具有很好的力学性能 By means of XRD, HRTEM, SEM and other analytical methods, the effects of PCS (polycarbosilane) precursor and binder, Y2O3 and AlN as sintering aids, and Cf / SiC Microstructure of composites. The results show that Y2O3 reacts mainly with the cleavage products of PCS and the oxides on the surface of AlN and SiC to form a liquid phase that is helpful for the densification of the composite material. AlN, on the other hand, reacts with the liquid phase and the PCS by means of reaction-dissolution-deposition Process to form a small SiC-AlN solid solution mainly distributed in the interface phase. It is precisely because of the carbon-rich interface containing a certain amount of SiC-AlN solid solution so that the fiber and the matrix between the moderate combination of fiber easy to play off and pull out the role of composite materials with good mechanical properties