利用束丝复合材料对PIP工艺制备2D-SiCf/SiC复合材料力学性能进行表征

Characterization of Mechanical Properties of 2D-SiCf/SiC Composites Fabricated by PIP Process Using Multifilament Composites

摘要:

为了找到一种能有效对陶瓷基复合材料先驱体浸渍裂解（PIP）工艺参数进行优化的方法，提出利用束丝复合材料对二维复合材料力学性能进行表征的方案。对5种PIP工艺条件制备的束丝以及二维SiCf/SiC复合材料在不同PIP工艺条件下力学性能变化规律进行了研究，并对采用束丝复合材料对二维复合材料力学性能表征的有效性进行了分析。研究表明，束丝复合材料和二维复合材料力学性能随PIP工艺的变化规律完全相同，这是因为两种复合材料界面、纤维损伤等特性基本相同。采用强度比对两种复合材料力学性能一致程度进行了表征，结果表明两者一致性较好，但随PIP工艺复杂程度的提高，两者一致性降低。利用束丝复合材料可以对二维复合材料力学性能进行较好的表征，可对二维等实体复合材料制备工艺进行初步优化，从而使材料工艺设计效率大为提高。

Abstract:

In order to find a simple and effective method to optimize the process parameter of precursor infiltration and pyrolysis (PIP) process for ceramic matrix composites, the viewpoint of characterization of the mechanical properties of 2D composites using multifilament composites was put forward. Multifilament and 2D SiCf/SiC composites were fabricated by five kinds of PIP processes, and the change rules of mechanical properties of the two kinds of composites with different PIP processes were investigated. Meanwhile, the validity of using multifilament composites to characterize the mechanical properties of 2D composites was analyzed. The results show that the change rules of mechanical properties of multifilament composites with PIP process parameters are in good agreement with that of 2D composites, because their interfaces, fiber damage and other characteristics are basically the same. The ratio of mechanical properties was employed to characterize the consistency between multifilament and 2D composites. The results indicate that the mechanical properties of those two kinds of composites have higher consistency, but it will decrease with the complexity of PIP process increasing. The mechanical properties of 2D composites can be well characterized by multifilament composites, and the process parameters of 2D composites fabricated by PIP process can be optimized primarily, which can enhance the process design efficiency obviously.