掺杂纳米硅薄膜的生长特性

采用等离子增强化学气相沉积(PECVD)方法成功的沉积出掺杂(主要是磷、硼)纳米硅薄膜.探讨了各种生长工艺条件对掺杂纳米硅薄膜的结构与性能的影响及其规律.利用高分辨电镜(HREM)、Raman散射等手段对掺入不同杂质后的纳米硅薄膜的微结构进行初步研究,并从实验和理论上对掺杂纳米硅薄膜的生长特性进行了探讨.得出掺杂纳米硅薄膜具有与掺杂非晶硅薄膜和掺杂微晶硅薄膜不同的生长特性,即杂质原子绝大部分是非活性的,只有很少一部分在薄膜中起施主作用.大部分非活性的杂质原子存在于晶粒间界.     

Au/BaTiO3复合薄膜的PLD制备及其光学性质研究

用脉冲激光沉积(PLD)技术制备了掺杂金颗粒的钛酸钡复合薄膜Au/BaTiO3,用透射电镜和X射线光电子能谱对薄膜进行了表征,研究了其线性光吸收特性.结果表明,用复合靶和转靶的方法可以成功地制备金属纳米团簇复合薄膜,并且制备出的薄膜有良好的化学结构和物理特征.     

低发射率薄膜的红外隐身特性研究

利用磁控溅射法制备了氧化铟锡（ITO）、掺铝氧化锌（ZAO）、TiO2/Ag/TiO2纳米多层等三种透明的低发射率薄膜。研究了这些低发射率薄膜以及降低材料红外发射率对降低红外辐射强度和红外隐身所起的作用。结果表明：降低红外发射率可以有效地抑制由于温度升高所带来的附加红外辐射;低红外发射率薄膜在红外隐身中有潜在应用价值。     

化学液相沉积制备PbSe薄膜生长过程及其性能研究

采用化学液相沉积方法在醋酸铅溶液体系中制备了厚度在微米量级的PbSe薄膜,通过扫描电镜、X射线衍射和红外光谱分析等测试手段研究了PbSe薄膜的生长过程以及沉积时间对薄膜相结构、表面形貌和红外透光性能的影响.研究结果表明:随着沉积时间的增加,薄膜致密度增大,Se/Pb原子比增加,都为表面富Se的PbSe薄膜;在不同沉积时...     

Investigation of Formation Process of the Chrome-free Passivation Film of Electrodeposited Zinc

The feasibility was investigated to substitute chrome-free passivation treatment of electrodeposited zinc in a titanium bath for chromate passivation treatment. The formation mechanism of the chrome-free passivation film was further analyzed. The surface mor- phologies and the elemental compositions of the treated samples with varied immersion times were observed by scanning electron mi- croscopy (SEM) and determined by energy dispersion spectrometry (EDS), respectively. The electrode potential of the sample surface was recorded in the film formation process. The changes of the electrode potential are in accordance with that of SEM and EDS of the sample surface. The results of X-ray photoelectron spectroscopy (XPS) show the chrome-free passivation film composed of ZnO, SiO2, TiO2, Zn4Si2O7(OH)2, and SrF2. The anode zinc dissolution and the local pH value increase due to the cathode hydrogen ion reduction process result in the formation of the chrome-free passivation film. The macro-images of the chrome-free passivation films formed on electrodeposited zinc show that the color of the film changes from blue to iridescence with the increase of the immersion times.     

铝元素对锌镀层耐蚀性的影响

研究了用复合电沉积法制备的锌铝镀层在微酸性腐蚀介质中的耐蚀参力。失重法，电化学性能试验证明：镀液中的氢氧化铝也能改善镀层的耐蚀性，但不如铝粉的作用显著。电子探针和等离子光谱显示含氢氧化铝和含铝粉镀层中的铝呈均匀分布状态，但前者铝的含量为５０ｐｐｍ，后者相对较多０．１５％。Ｘ－射线衍射法揭示溶液中的氢氧化铝能使镀层的结晶细致，晶面择优取向程度增加。当镀液中含有铝粉时，所得镀层的结构则成为层状，且结晶     

溅射工艺对TiAlN薄膜摩擦学性能的影响

研究利用反应磁控溅射法在高速钢基体上制备TiAlN薄膜材料,采用XRD测试薄膜晶体结构,用UMT显微力学测试仪测试薄膜摩擦系数.在此基础上讨论铝含量、直流偏压及后期处理对薄膜摩擦系数的影响.结果表明,不同铝含量的TiAlN薄膜中都存在面心立方相和六方相,随着铝含量的增高,面心立方相比例逐渐减小,六方相增多.铝的引入使膜层的硬度明显提高.随着Al含量增加,GCr15与TiAlN膜层之间的摩擦系数下降.另外,直流偏压和后期处理亦可显著改善薄膜的抗摩擦性能.     

Magnetic and Optical Properties of the TiO2-Co-TiO2 Composite Films Grown by Magnetron Sputtering

The TiO2-Co-TiO2 sandwich films were successfully grown on glass and silicon substrata making alternate use of radio frequency reactive magnetron sputtering and direct current magnetron sputtering. The structures and properties of these films were identified with X-ray diffraction (XRD), Raman spectra and X-ray photoemission spectra (XPS). It is shown that the sandwich film consists of two anatase TiO2 films with an embedded Co nano-film. The fact that, when the Co nano-film thickens, varied red shifts appear in optical absorption spectra may well be explained by the quantum confinement and tunnel effects. As for magnetic properties, the saturation magnetization, remnant magnetic induction and coercivity vary with the thickness of the Co nano-films. Moreover, the Co nano-film has a critical thickness of about 8.6 nm, which makes the coercivity of the composite film reach the maximum of about 1413 Oe.     

Electrochemical Behavior of Oxide Films of Stainless Steel in 40 kHz Sonicated Sulphate Electrolytes

This paper describes effects of 40 kHz ultrasound on the oxide films of stainless steel in sulphate electrolytes so as to determine the transmitted power and to characterize mass transfer and peak current density on the electrode surface. Emphasis was mainly laid on electrochemical oxidations and peeling mechanism of oxide films in sonicated sulphate solutions (0.5 and 1.0 mol/L). Polarization voltammetry, current response traces and SEM analysis were carried out in order to provide full information as to oxide films surface. Results shows that the rate of electrochemical oxidation, the shape of polarization curves and the surface micrographs in sonicated sul- phate electrolytes are different from those obtained without introduction of ultrasound. It is concluded that ultrasound can change the electro-chemical behavior of oxide films by its cavitaion effects, which would produce transient mechanical impulsive force and enhance electrochemical reactions.     

不同金属基体上W-C:H 溅射薄膜的摩擦学性能

采用非平衡磁控溅射技术在40Cr、9Cr18、GCr15、TC4及LY12等5种金属基体上沉积了钨掺杂含氢类金刚石(W-C:H)薄膜。采用Raman光谱仪、扫描电子显微镜、纳米硬度计及纳米划痕仪分别测试了薄膜的微结构、厚度、硬度及附着力,采用球-盘摩擦试验机及光学轮廓仪分别在干摩擦和PFPE脂润滑条件下评价了5种金属材料基体上薄膜的摩擦磨损性能。薄膜性能测试结果显示,该厚度为1μm的薄膜具有典型的类金刚石结构,硬度与弹性模量分别为11.56和128.34 GPa,附着力为645 m N;摩擦试验结果显示,在干摩擦条件下几种金属基体表面W-C:H薄膜的摩擦因数和磨损率差别比较显著,而在脂润滑条件下基体材料的影响较小;与干摩擦条件相比,脂润滑条件下薄膜的磨损可减少60%~75%;在干摩擦与脂润滑条件下,9Cr18与40Cr基体上的W-C:H薄膜摩擦体系分别具有最小的磨损率1.71×10-7mm3/(N·m)及4.55×10-8mm3/(N·m)。