航空发动机涡轮叶片垢质结合强度研究

Study on Scale Bonding Strength of Aero-engine Turbine Blade

为测定航空发动机涡轮积垢叶片垢质与叶片之间的结合强度,采用划痕法对积垢叶片进行了划痕试验。通过扫描电镜(SEM)观察了垢质的表面与界面形貌,利用能谱仪(EDS)分析了垢质的元素分布,采用划痕法结合摩擦信号、声信号和划痕显微形貌测定了垢质与叶片基体的结合强度。结果表明,叶片压力面垢质有明显的颗粒物聚集粘附的现象,且垢质厚度和粗糙度大于吸力面;垢质成分大多数为氧化物,少数为硅酸盐;划痕法测得在压头曲率半径为200μm的情况下,叶片压力面垢质结合强度平均值为54.7 N,吸力面垢质结合强度平均值为27.3 N。

In order to measure the bonding strength between the scale and the aero-engine turbine fouling blade,the scratching method was used to make a scratch text on the fouling blade.The surface and interface micromorphology of the scale were observed by scanning electron microscope(SEM),and the element distribution of the scale was analyzed by energy dispersive spectrometer(EDS).The scratching method combined with frictional signal,AE signal and scratch micromorphology were used to measure the bonding strength of the scale and the blade matrix.The results show that the scale on the pressure surface of the blade has obvious particle aggregation and adhesion.The thickness and roughness of the scale are greater than the suction surface.Most of the scale components are carbon and oxygen compounds,a few are silicates.When the radius of the indenter is 0.2 mm,the average scale bonding strength on the blade pressure surface is 54.7 N,and the average scale bonding strength on the blade suction surface is 27.3 N.