SiC涂层C/C复合材料在1300℃湿氧环境中的疲劳行为  

Fatigue behavior of SiC coated C/C composites in wet oxygen atmosphere at 1300℃

作　　者：刘持栋[1] 成来飞[1] 栾新刚[1] 张伟华[1] 

机构地区：[1]西北工业大学超高温结构复合结构材料重点实验室西安710072

出　　处：《复合材料学报》2009年第4期136-140,共5页Acta Materiae Compositae Sinica

基　　金：国家973计划项目(2006CB600908)

摘　　要：在半圆柱型氧化模式的基础上,建立了具有SiC涂层C/C复合材料在湿氧环境中的疲劳失效模型。在高温湿氧环境下,C/C复合材料的疲劳失效主要受到氧化深度的控制,而影响氧化深度的主要参数是涂层表面裂纹的宽度。对此疲劳失效模型,讨论分析实验温度以及外加应力对裂纹宽度的影响,考虑了疲劳载荷引起的材料模量变化对裂纹宽度的影响。在90、105、120、135和150 MPa疲劳应力下的材料在1300℃湿氧环境中的平均寿命分别为48660、32645、22078、12332和4786循环。进行了实验数据与模型计算值的对比,实测寿命与预测结果吻合良好。另外,本模型在外加应力较大、实验时间较短条件下的预测数据与实验结果最为接近。Based on the half-cylinder oxidation regime, a model was developed to simulate the fatigue behavior of the SiC coated C/C composite in wet oxygen atmosphere. Under the current experimental conditions, the fatigue failure of the C/C composite was primarily controlled by the oxidation depth, which is mostly affected by the crack width of the coating. The effects of temperature and the applied stress were discussed. Modulus reduction effect on the crack width, which caused by fatigue, is also considered. The composite mean lives under 90, 105, 120, 135 and 150 MPa are 48660, 32645, 22078, 12332 and 4786 cycles, respectively. Comparisons are conducted between the experimental and simulation data. The experimental and simulative results agree fairly well. Besides, the calculation is close to the practical results when the applied stress is sufficiently high and the test time is short.

关 键 词：C/C复合材料 疲劳 高温性能 腐蚀 计算建模 

分 类 号：TB332[一般工业技术—材料科学与工程]