碳化硅纤维高温抗氧化性研究进展

Research Progress on High Temperature Oxidation Resistance of SiC Fibers

SiC纤维作为SiC_(f)/SiC复合材料的重要承载部分,在高温氧化环境下的微观结构演变和性能变化直接影响SiC纤维的实际应用。本文综述了SiC纤维的氧化机理和氧化模型、氧化行为的影响因素以及提高抗氧化性的方法。根据氧分压将SiC纤维的氧化行为分为被动氧化与主动氧化;氧化环境如水氧环境下的高温氧化加快了SiC纤维氧化层厚度的增加和裂纹的产生,致使SiC纤维的力学性能下降;SiC纤维的自身组成与微观结构也会对氧化结果产生各不相同的影响。本文对SiC纤维在高温环境下的应用具有一定的借鉴作用。

As an important load-bearing part of SiC_(f)/SiC composites,the microstructure and performance evolution of SiC fibers under high temperature oxidative environment directly affect their practical application.This paper reviewed the oxidation mechanism and oxidation model,as well as the influencing factors of oxidation behavior of SiC fibers.The approaches to improve the oxidation resistance of SiC fibers were also summarized and introduced.The oxidation behavior of SiC fibers is divided into passive and active oxidation according to the oxygen partial pressure.The high temperature oxidation in the water-oxygen environment accelerates the increase of the SiC fibers oxide layer thickness and the generation of cracks,resulting in the degradation of the mechanical properties.The composition and microstructure also have different effects on the oxidation results.This paper is intended to provide some reference for the application of SiC fibers under high temperature oxidative environments.