期刊
APPLIED SURFACE SCIENCE
卷 387, 期 -, 页码 1183-1187出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2016.06.084
关键词
Surface morphology; Laser oxidation; Laser coloration; Metal reflectivity
类别
资金
- State Key Laboratory of Laser Interaction with Matter foundation [SKLLIM1501]
Laser-induced oxidation will change the laser reflectivity and color features of metal surface. Both changes can be theoretically calculated based on the oxidation kinetics and the optical constants of oxides. For the purpose of calculation, the laser-induced oxidation process of pure polycrystalline iron was studied. Samples with various color features were obtained by continuous wave Nd:YAG fiber laser (1.06 mu m) irradiation depending on progressive durations in the intensity of 1.90 W/cm(2). The real-time reflectivity and temperature were measured with integral sphere and thermocouples. The irradiated surface morphology and phase structures were characterized by microscope, X-ray diffraction and Raman spectrum. It was found that the first formed magnetite made the surface reflectivity decline rapidly and caused the positive feedback effect because of molecular absorption. The later formed hematite oscillated the reflectivity by interference effect. The oxide films were thin, orientated and badly crystallized. The oxidation process was influenced by the grain orientation of the metal substrate. These results made the mechanism of laser-induced oxidation of iron clear and provided available experimental data for accurate modeling of the oxidation kinetics. (C) 2016 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据