摘要
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。
CoCrAlYTa-Al2O3- ZrB2 composite coating is deposited on the Co base alloy surface by laser remelting. The microstructure, phase and micro-hardness are studied using scanning electron microscope （SEM） and X-ray diffractometer （XRD）. The high temperature oxidation test is conducted. It is found that the defects of as-sprayed coating like lamellar stacking microstructure and pores are eliminated by laser remelting, and the remelted coating possesses a denser microstructure. The micro-hardness of the remelted coating at the cross section is promoted from an average of 899.47 HV to 929.484 HV. The properties of oxidation resistance are significantly improved. The increased mass of the remelted coating is 1/6 of that of the clad coating, and the oxide film of the remelted coating is homogeneous.
出处
《激光与光电子学进展》
CSCD
北大核心
2014年第2期130-136,共7页
Laser & Optoelectronics Progress
