论文部分内容阅读
采用电子束物理气相沉积(EB-PVD)技术在Ti Al基体上制备Ni Al Hf涂层,结合氧化增重曲线的测试结果,研究了Ni Al Hf涂层对基体在900,950和1000o C空气中氧化行为的影响。采用X-射线衍射(XRD)研究表面的物相结构,XRD结果表明,沉积后表面形成β-Ni Al相,说明Hf固溶于其中。结果表明,在950o C氧化后涂层表面形成致密的氧化铝保护膜。扫描电子显微镜(SEM)和能谱(EDS)被用来测试其表面的形貌和元素分布。结果表明,在氧化过程中,基体和涂层之间的元素发生互扩散。随着氧化时间的增加,涂层厚度减小,扩散区发生显著变化。采用显微硬度表征涂层的韧性,涂层的显微硬度(HV)为7050 MPa左右。Ni Al Hf涂层能提高基体高温抗氧化性能。
Ni Al Hf coating was prepared on Ti Al matrix by electron beam physical vapor deposition (EB-PVD) technology. Combined with the test results of oxidation weight gain curve, the effect of Ni Al Hf coating on the matrix oxidation at 900, 950 and 1000o C in air The impact of behavior. The phase structure of the surface was investigated by X-ray diffraction (XRD). The XRD results showed that the surface of β-Ni Al phase formed after deposition, indicating that Hf was dissolved in the solution. The results show that a dense alumina protective film is formed on the surface of the coating after oxidation at 950oC. Scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) were used to test the surface topography and elemental distribution. The results show that during the oxidation process, the intermetallics diffuse between the matrix and the coating. With the increase of oxidation time, the coating thickness decreases and the diffusion region changes significantly. The microhardness is used to characterize the toughness of the coating. The microhardness (HV) of the coating is about 7050 MPa. Ni Al Hf coating can improve the substrate high temperature oxidation resistance.