喷涂功率对纳米热障涂层组织及性能的影响

Effect of spraying power on microstructure and property of nanostructured thermal barrier coatings

采用扫描电子显微镜(SEM,Scanning Electron Microscopy)、X射线衍射(XRD,X-Ray Diffraction)等方法研究了大气等离子喷涂功率对纳米Y2O3部分稳定的ZrO2(YSZ,Yttria Stabilized Zirconia)热障涂层组织结构及热震性能的影响.结果表明,不同功率下制备的陶瓷层包含熔融相和未熔相,未熔相中存有纳米晶粒,相组成为四方相ZrO2.随着功率的增加,涂层的纳米区域逐渐减少,孔隙率逐渐降低,热震寿命先增加后减少.涂层失效位置位于靠近TGO(Thermally Grown Oxide)处的陶瓷层中.

Effect of air plasma spraying power on microstructure and thermal shock of nanostructured yt- tria stabilized zirconia （YSZ） thermal barrier coatings was investigated by scanning electron microscopy （SEM） and X-ray diffraction （XRD）. It was found that there were two regions of melted phases and non-mol- ten phases for the ceramic top coating under different power, non-molten phases included the nanosized grains, and phase composition was metastable tetragonal zirconia. With the increase in power, the area of nanosized grains gradually decreased, the porosity of the coating gradually reduced, and the life of the coating increased first and then decreased. The coating failure position was located at the ceramic top coating close to thermally grown oxide （TGO）