CAJ | 학술논문

采用电子束物理气相沉积(EB-PVD)的方法在第二代镍基单晶高温合金 N5上先后沉积 Ru 层和 NiAlHf涂层.利用X射线衍射(XRD)、扫描电镜(SEM)、能谱仪(EDS)等研究Ru/NiAlHf涂层与合金基体在1100℃的界面上的互扩散行为及高温循环氧化性能.结果表明:在扩散初期,涂层与合金基体界面上处形成了不连续的Ru2AlTa相,该相有效抑制了高温合金基体中难熔元素的外扩散,而当扩散时间延长至100 h时,该相消失,同时合金基体中形成了少量拓扑密堆相(P-TCP),但未形成二次反应区(SRZ).Ru/NiAlHf涂层在1100℃循环氧化150h后氧化膜仍未出现显著剥落,表现出了良好的抗循环氧化性能.
채용전자속물리기상침적(EB-PVD)적방법재제이대얼기단정고온합금 N5상선후침적 Ru 층화 NiAlHf도층.이용X사선연사(XRD)、소묘전경(SEM)、능보의(EDS)등연구Ru/NiAlHf도층여합금기체재1100℃적계면상적호확산행위급고온순배양화성능.결과표명:재확산초기,도층여합금기체계면상처형성료불련속적Ru2AlTa상,해상유효억제료고온합금기체중난용원소적외확산,이당확산시간연장지100 h시,해상소실,동시합금기체중형성료소량탁복밀퇴상(P-TCP),단미형성이차반응구(SRZ).Ru/NiAlHf도층재1100℃순배양화150h후양화막잉미출현현저박락,표현출료량호적항순배양화성능.
A novel Ru/NiAlHf coating was deposited onto an Ni-based single crystal superalloy N5 by electron beam-physical vapor deposition(EB-PVD) of Ru and NiAlHf layer. The cyclic oxidation and interdiffusion of the Ru/NiAlHf coating at 1 100 ℃ was investigated by X-ray diffraction(XRD)and scanning electron micrograph (SEM) equipped with energy dispersive spectroscopy (EDS). The results show that the discontinuous Ru2AlTa phase forms at the interface of coating and substrate at initial diffusion stage, which effectively inhibits outward diffusion of refractory elements in the superalloy. The phase disappears after 100 h annealing. The Ru/NiAlHf coatings effectively suppress the formation of secondary reaction zone (SRZ). No apparent scale spallation is observed on the Ru/NiAlHf coating even after 150 h cyclic oxidation, indicating that the coatings exhibit a good cyclic oxidation-resistance.