管状C/SiC复合材料高温空气氧化行为与宏细观建模研究  

Oxidation Behavior and Meso-macro Model of Tubular C/SiC Composites in High-temperature Environment

作　　者：全文心 余艺平 方冰 李伟[1] 王松[1] QUAN Wenxin;YU Yiping;FANG Bing;LI Wei;WANG Song(Science and Technology on Advanced Ceramic Fibers and Composites Laboratory,College of Aerospace Science and Engineering,National University of Defense Technology,Changsha 410073,China)

机构地区：[1]国防科技大学空天科学学院,新型陶瓷纤维及其复合材料重点实验室,长沙410073

出　　处：《无机材料学报》2024年第8期920-928,共9页Journal of Inorganic Materials

基　　金：湖南省自然科学基金面上项目(2023JJ30634);国家重点实验室基金(6142907230202)。

摘　　要：氧化损伤是影响火箭发动机用C/SiC复合材料喷管寿命的主要因素之一。为准确评估C/SiC复合材料喷管的氧化损伤,本研究以近似喷管结构的管状C/SiC复合材料为实验对象,研究了管状C/SiC复合材料在高温(900~1300℃)空气环境下的氧化行为,包括其组成、结构及力学性能的演变规律,发现管状C/SiC复合材料在该高温空气环境下表现出受扩散控制的氧化特征,质量与剩余强度随时间呈幂函数下降趋势,下降速率与温度正相关。在此基础上,从氧化动力学与传质学理论角度出发,建立了管状C/SiC复合材料细观/宏观尺度氧化模型,模拟了管状C/SiC复合材料高温空气氧化过程,并预测了材料的质量与剩余强度。模型预测结果与实验数据拟合程度较高,可为C/SiC复合材料喷管的寿命评估提供参考。Oxidation damage is one of the main factors affecting the life of C/SiC composite nozzle used in rocket engines.To accurately predict the oxidation damage of C/SiC composite nozzle,we explored the oxidation behavior of the tubular C/SiC composites which had a similar shape to nozzle.Evolution of their composition,structure,and mechanical properties was investigated at different temperatures ranging from 900 to 1300℃.The results showed that the tubular C/SiC composites exhibited diffusion-controlled oxidation characteristics under the high-temperature environment.Their mass and residual strength decreased as a power function with time,and decline rate was positively correlated with temperature.Moreover,based on the theory of oxidation kinetics and mass transfer,a macro-meso oxidation model was established to simulate the oxidation process of tubular C/SiC composites in high-temperature environment to timely predict the evolution of their mass and residual strength.Consequentely,all the predicted results of the model fitted well with the experimental data.Our investigation consolidate that this macro-meso oxidation model is powerfull to predict the oxidation behavior and the life-span of C/SiC composite nozzle.

关 键 词：C/SIC复合材料 高温氧化 氧化模型 寿命预测 

分 类 号：TB332[一般工业技术—材料科学与工程]