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采用等离子喷涂工艺在Co基合金表面制备CoCrAlYTa-Al_2O_3-ZrB_2复合涂层,并采用激光重熔工艺对涂层进行处理。通过扫描电镜(SEM)、和X射线衍射仪(XRD)对重熔前后试样进行检测,分析涂层的微观结构及物相组成,同时对涂层进行高温氧化实验,比较重熔前后试样的性能。结果表明,激光重熔消除了等离子喷涂层的片层状结构、孔隙等缺陷,涂层致密性有很大提高;激光重熔层截面显微硬度从平均899.47 HV提高到929.484 HV;激光重熔层氧化增重速率约为等离子喷涂层的1/6,且氧化膜均匀致密,有效阻止氧化的进一步进行,从而大大提高涂层的抗氧化性能。
The CoCrAlYTa-Al_2O_3-ZrB_2 composite coating was prepared on the surface of Co-based alloy by plasma spray process, and the coating was treated by laser remelting. The samples before and after remelting were examined by scanning electron microscopy (SEM) and X-ray diffractometer (XRD). The microstructure and phase composition of the coating were analyzed. Meanwhile, the coating was subjected to high temperature oxidation test. The samples before and after remelting Performance. The results show that the laser remelting eliminates the lamellar structure, porosity and other defects of the plasma sprayed coating, the coating densification has greatly improved; the microhardness of laser remelted layer cross section increased from an average of 899.47 HV to 929.484 HV; laser remelted The rate of layer oxidation and weight gain is about 1/6 of the plasma sprayed layer, and the oxide film is uniform and compact, effectively preventing the further oxidation, thereby greatly improving the anti-oxidation performance of the coating.