离子束溅射淀积光学薄膜的膜厚均匀性实验

介绍了离子束溅射技术改善薄膜均匀性的两种方法。研究了修正板技术,根据工程需要将修正板技术应用于行星转动条件下的光学薄膜的均匀性修正。分别研究了靶摆动和不摆动的情况下,淀积薄膜的均匀性修正。实验结果表明,修正后的均匀性结果优于 1%,能满足实际应用的要求;靶摆动修正的均匀性结果优于修正板技术。     

The influence of Y ion implantation on the oxidation behaviour of ZrN coating

The purpose of this work was to determine the influence of ion implantation on the oxidation resistance of ZrN coatings. Samples were prepared on AISI 304 stainless steel by cathodic arc deposition. They were submitted to Y implantation at 150 °C with various fluences using a metal vacuum vapour arc ion implanter. The oxidation behaviour of as-deposited and Y-implanted ZrN coatings was characterized by weight gain measurement. The oxidation resistance of the ZrN coating was reduced after it was implanted with yttrium at a low fluence but improved at higher fluence. X-ray photoemission spectroscopy and glancing angle X-ray diffraction were employed to analyze the valence states of the oxide scale and the phase composition of the oxidation layers. Yttrium implantation can greatly improve the oxidation resistance of the ZrN coating.     

The role of sputter etching and annealing processes on the formation of β-FeSi2 thin films

For formation of β-FeSi₂ using ion beam sputter deposition (IBSD) method, sputter etching (SE) followed by thermal annealing is effective substrate treatment to obtain highly (100)-oriented β-FeSi₂ on Si(100). However, the best condition of these treatments are not yet known. In this work, the effect of SE together with annealing process on the orientation of the film is investigated. Prior to the deposition of Fe, the substrate is irradiated by Ne⁺ ions with various energy and fluence followed by thermal annealing at 1073 K for 60 min. The overall results show the most suitable SE condition using Ne⁺ ion on IBSD method is the energy of 1 keV with the fluence of 3.0×10¹⁹ ions /m².     

Surface Alloying of Nitrogen to Improve Corrosion Resistance of Steels and Stainless Steels

It is well known that the addition of nitrogen to steels and stainless steels enhances the passivity and localized corrosion resistance, in addition to improving the mechanical properties. Selective alloying of surfaces of steels and stainless steels with nitrogen could also enhance the corrosion resistance and improve the mechanical properties without affecting the bulk properties. Techniques like ion implantation, laser alloying, nitriding, etc. can be effectively used to introduce very high levels of nitrogen. In addition, these techniques can also produce modified surfaces with novel microstructures to further improve the properties. The surface alloying methods also provide an opportunity to selectively nitrogenate the surface of finished components in order to obtain better properties. The review highlights the techniques, modifications and the properties obtained further.     

用于火灾探测的离子感烟探测器的设计研究

本文论述了自动火灾离子感烟探测器的结构组成及其电路工作原理。通过对探测器电路的具体分析，进一步阐明自动火灾离子感烟探测器的相关功能。     

a—Si1—xGdx薄膜中Gd^3＋离子的补偿作用

本文基于对电子束蒸发的ａ－Ｓｉ１－ｘＧｄｘ薄膜的光吸收，变温电导特性和ＥＳＲ实验研究的结果，对Ｇｄ＾３＋离子的作用进行了分析研究。Ｇｄ原子的外壳层５ｄ＾１６ｓ＾２产生轨道杂化，在ａ－Ｓｉ网格中形成五配位的Ｇｄ＾３＋离子。Ｇｄ＾３＋离子的杂化轨道除与网格中的Ｓｉ原子键合外，还能与Ｓｉ的悬挂键Ｓｉ３＾０键合，起补偿悬挂键的作用。Ｇｄ＾３＋离子的角动量Ｊ的多重态间的跃迂吸收，改变了薄膜的近红外吸收特性。     

Ion-induced electron emission – monitoring the structure transitions in graphite

The temperature dependence of ion-induced electron emission yield γ under 30 keV Ar⁺ ion impacts at incidence angles θ = 0−80° under dynamically steady-state conditions has been measured for polygranular graphite POCO-AXF-5Q. The fluencies were 10¹⁸–10¹⁹ ion/cm², the temperatures varied from the room temperature (RT) to 400 °C. The RHEED has shown that same diffraction patterns correspond to a high degree of disorder at RT. At high temperature (HT), some patterns have been found similar to those for the initial graphite surfaces. The dependence γ(T) has been found to be non-monotonic and for normal and near normal ion incidence manifests a step-like increase typical for a radiation induced phase transition. At oblique and grazing incidence (θ > 30°), a broad peak was found at T_p = 100 °C. An analysis based on the theory of kinetic ion-induced electron emission connects the behavior of γ(θ,T) to the dependence of both secondary electron path length λ and primary ion ionizing path length R_e on lattice structure that drastically changes due to damage annealing.     

离子交换型Cu／SiO2催化剂的制备和表征

用离子交换法制备了Ｃｕ／ＳｉＯ２催化剂，并在催化活性与稳定性方面与浸渍型的Ｃｕ／ＳｉＯ２催化剂进行了对比，采用差热分析（ＤＴＡ）、Ｘ射线衍射（ＸＲＤ）、比表面测定等方法对催化剂进行了表征     

基于卷积神经网络的岩心FIB-SEM图像分割算法

岩心聚焦离子束扫描电镜(FIB-SEM)图像存在灰度分布不均及孔隙内局部高亮等现象,采用传统图像分割算法所得孔隙分割精度较低,而基于轮廓的分割算法需对孔隙进行人工标记,操作繁琐且无法精确提取孔隙。提出一种利用卷积神经网络的端到端岩心FIB-SEM图像分割算法。结合光流法与分水岭分割图像标注法构建岩心FIB-SEM数据集,联合ResNet50残差网络、通道和空间注意力机制提取特征信息,采用改进的特征金字塔注意力模块提取多尺度特征,利用亚像素卷积模块经上采样获取更精细的孔隙边缘并恢复为原始分辨率。实验结果表明,与阈值分割算法和基于主动轮廓的岩心FIB-SEM分割算法相比,该算法分割精度更高且无需人工操作,其平均像素精度和平均交并比分别达到90.00%和85.81%。     

用Interphako干涉显微镜测量离子交换玻璃薄片中的梯度折射率分布

本文用 Interphako 干涉显微镜测量了经 NaNO_3盐浴处理的玻璃薄片中的梯度折射率分布。将剪切微差干涉测得的结果与剪切干涉的结果进行了比较,并讨论两种测量方法的特点和误差。