聚碳硅烷纤维无机化过程中弯曲的形成及对SiC纤维性能的影响

Analysis of the Bend Forming in Pyrolysis Process of Polycarbosilane (PCS) Fibers and Effect on the Properties of SiC Fibers

先驱体转化法制备连续SiC纤维无机化过程中有明显的失重和收缩,造成了纤维弯曲,从而影响了纤维的单丝强度和束丝拉伸性能。根据聚碳硅烷(PCS)纤维的无机化过程,探讨了SiC纤维弯曲的种类和形成原因,通过力学分析研究了弯曲对SiC纤维性能的影响;根据弯曲形成原因,提出利用加张热交联和加张烧成的方法解决纤维的弯曲问题,从而提高SiC纤维的性能。

The preparation of the polymer-derived SiC fibers involves a pyrolysis process, in which great weight loss and shrinkage are usually recorded. It causes the bend, which reduces the tensile strength of SiC fibers. The reason of the bend forming is discussed on the basis of the pyrolysis process of PCS fibers; the effect of the bend on the properties of SiC fibers is studied through mechanical analysis. The way of thermal-curing under tension or pyrolysis under tension is brought forward in order to solve the problem, then the properties of SiC fibers can be improved.