摘要
针对2D编织SiCf/SiC陶瓷基复合材料(CMC)低压涡轮导叶开展热疲劳试验研究。基于SiCf/SiC-CMC不导电的特性,通过高频电磁感应加热金属传热结构,再由金属热辐射加热CMC试件的方式建立热疲劳试验系统。开展了最高温度902℃且模拟CMC导叶径向温差的热疲劳试验。经过1000循环后,叶片质量减小,叶盆及叶背表面粗糙度明显增大,未出现破坏性长裂纹。通过电镜观测发现,叶片表面出现基体脱落形成的凹坑。对试验后的叶片表面及内部材料进行元素分析对比,发现叶片表面基体脱落处的SiC纤维出现了明显的氧化现象。
The thermal fatigue test of 2D woven SiCf/SiC ceramic matrix composite(CMC)low pressure turbine guide vane was explored.Based on the non-conductive property of SiCf/SiC-CMC,the heat transfer structure of metal was heated by high frequency electromagnetic induction.The CMC specimen was then heated by the thermal radiation of the metal to establish the thermal fatigue test system.The maximum temperature of the test was 902℃,and the radial temperature difference of guide vane was simulated.After 1000 cycles,the weight of blade decreased,the surface roughness increased obviously,and no destructive long crack appeared.There are pits on the blade surface caused by the matrix falling off observed by SEM.By the analysis and comparison of the components of the surface and internal materials of the blade after the test,obvious oxidation phenomenon on the surface of the SiC fibers was found.
作者
刘鑫
乔逸飞
董少静
申秀丽
LIU Xin;QIAO Yi-fei;DONG Shao-jing;SHEN Xiu-li(School of Energy and Power Engineering,Beihang University,Beijing 100191,China)
出处
《燃气涡轮试验与研究》
北大核心
2020年第4期26-30,共5页
Gas Turbine Experiment and Research
