Microstructure and Corrosion Performance of Oxide Coatings on Aluminium by Plasma Electrolytic Oxidation in Silicate and Phosphate Electrolytes

Ceramic coatings are fabricated on pure aluminium by plasma electrolytic oxidation （PEO） in three kinds of electrolyte systems [E1： 0.05M NaOH＋0.033M Na2SiO3, E2： 0.025M NaOH＋0.008M （NAPO3）6 and E3： 0.025M NaOH＋0.066M Na2SiO3＋0.008M （NAPO3）6]. The voltage-time responses show that the PEO process of E2 has the highest discharging voltage, which results in the biggest pores and heaviest cracks on the surfaces. X-ray diffraction results show that coatings produced in E1 and E3 are mainly composed of γ-Al2O3 and mullite, while coatings produced in E2 are mainly composed of a-Al2O3. After PEO treatment the corrosion resistance of aluminium is improved significantly and the coatings produced in E3 perform the best corrosion resistance.     

Phase Composition and Thin Structure of Steel Surface after Plasma Electrolytic Carbonitriding

Russian Physics Journal - Using the transmission electron microscopy of thin foils the paper studies the phase composition and fine structure of 0.18С–1Cr–3Ni–1Mo–Fe...     

Corrosion of Ultrathin Iron Layers and Titanium Nitride Coated Iron

In this paper results are presented on the corrosion resistance against SO₂-polluted atmospheres of ultrathin Fe layers (<2.5 nm) deposited on SiO₂/Si wafers by two methods: vacuum evaporation and Langmuir–Blodgett (LB) technique. It is shown that the corrosion resistance of the evaporated films is similar to that shown by massive iron while the corrosion resistance of the LB films is remarkably higher. We also show that the corrosion resistance of iron evaporated films can be greatly enhanced by using TiN coatings. Results on the influence of the SO₂ concentration, the atmospheric relative humidity and the exposure time on the corrosion behaviour of thin (30 nm) TiN layers deposited onto evaporated Fe films on SiO₂/Si wafers are discussed. This revised version was published online in July 2006 with corrections to the Cover Date.     

用能量色散型X荧光法测定超高磷铸铁中的磷

本文研制的超高磷铸铁标样成分均匀、定值准确、含量范围宽。应用能量色散型Ｘ荧光光谱分析和粉未压片法对样品中的磷进行了测定。在测定过程中改进了粉未压片工艺和Ｌｕｃａｓ－Ｔｏｏｔｈ强度校正软件。本方法快速简便，分析结果令人满意。     

合金铸铁的X射线荧光光谱分析

探讨了用ＸＲＦ法测定合金铸铁中Ｓi、Mn、P、S、Ni、Cr、Cu、Al、Mo、V、T、Nb、Sn、W、Co１５个杂质元素的分析方法，简述了分析条件及实验方法，方法简便、快速、准确、精密度较好。     

The Effects of Thermal Treatments on Microstructure Phosphorus-Doped ZnO Layers Grown by Thermal Evaporation

The ZnO films doped with 3 wt% phosphorus (P) were produced by activating phosphorus doped ZnO (ZnO:P) thin films in oxygen (O₂) ambient at 600°C for 30, 60, 90 and 120 min, respectively. As-deposited films doped with phosphorus are highly conductive and n type. All the films showed p-type conduction after annealing, in an O₂ ambient atmosphere. The activation energies of the phosphorus dopant in the p-type ZnO under O₂ ambient gases indicate that phosphorus substitution on the O site yielded a deep level in the gap. With a further increase of the annealed durations, the crystalline quality of the ZnO:P sample is degraded. The best p-type ZnO:P film deposited at 600°C for 30 min shows a resistivity of 1.85 Ω cm and a relatively high hole concentration of 5.1 × 10¹⁷cm^–3 at room temperature. The films exhibit a polycrystalline hexagonal wurtzite structure without preferred orientation. The mean grain sizes are calculated to be about 60, 72, 78, 85 and 90 nm for the p-type ZnO films prepared at 600°C for 30, 60, 90 and 120 min, respectively. Room temperature photoluminescence (PL) spectra of the ZnO film exhibit two emission bands — paramount excitonic ultraviolet (UV) emission and weak deep level visible emission. The excellent emission from the film annealed at 600°C for 30 min is attributed to the good crystalline quality of the p-type ZnO film and the low rate of formation of intrinsic defects at such short duration. The visible emission consists of two components in the green range.     

铸铁的直读光谱分析

本文介绍应用美国BAIRD1000型DV－4直读光谱仪进行铸铁光谱分析的方法，结果表明，在DV－4光谱仪上，完全白口化的铸铁，采用较高的预燃热量，铸铁光谱定量分析结果能够满足化铁工艺需求。     

Hardening of Metal Product Surface Layers by the Combined Gas Discharge Plasma

The properties of a low-pressure combined gas discharge initiated in a resonator chamber near the surface of a metal workpiece subjected to the superposition of high electromagnetic and electrostatic fields have been studied. It has been shown that, when a constant potential is applied to the workpiece, a layer forms on its surface in which positive ions or electrons (depending on the sign of the potential) accelerate to an energy as high as several hundred electronvolts. The interaction between accelerated particles and the workpiece causes the liberation of heat in the surface layer, which is sufficient for its complete melting. If the applied potential is positive, a hardening nanostructure arises on the workpiece surface. The physical parameters of the combined gas discharge have been estimated.     

ICP-AES测定铸铁中的硅、锰、磷、铜

通过微波消解器处理样品 ,优化了实验条件 ,研究了 Si 2 5 1.6 nm、Mn 2 93.9nm、P 2 13.6 nm、Cu32 7.3nm等元素的谱线 ,由此测定铸铁中的硅、锰、磷、铜 ,取得了理想结果。     

Conversion Electron Moessbauer Spectroscopie Studies on Ion Implanted Iron Layers

Conversion electron Moessbauer spectroscopy (CEMS) is a method very suitable for the study of ion implanted iron. It is demonstrated on nitrogen and phosphorus implanted iron layers. Using this technique not the 14.4-keV-gamma-rays as in the case of the conventional Moessbauer transmission experiments but the conversion and Auger electrons are detected. These electrons have a maximum energy of 7.3 keV. The Moessbauer signal can be obtained from a surface layer of about 300 nm. But the main fraction of the signal, namely 65%, comes from the first 50 nm. This range is just interesting for ion implantation. Depending on the test conditions different iron nitrides are formed by the nitrogen implantation and the phosphorus implantation can result in both amorphization and compound formation in the implanted layer.     

用发射光谱法连续摄谱检测铸铁中的硅、锰、镁

采用高压火花光源，一次预烧，连续摄谱的发射光谱法定量分析铸铁中硅，锰、镁三元素，加快了分析速度，可测定质量百分数为1.50%-3.50%的硅、0.40%-1.10%的锰，0.010%-0.090%的镁，其相对标准偏差分别为硅1.9%，锰3.0%，镁10.4%。     

Microstructure and Magnetic Domains of Iron Films on Liquid Surfaces

Iron （Fe） films with a thickness ranging from 1.Onto to 80.Onto are deposited on silicone oil surfaces by a vapor phase deposition method. The films with a thickness old 〈 2.0 nm do not exhibit planar morphology but ramified aggregates instead. Magnetic force microscopy studies for the Fe films （10.0nm ≤d ≤ 80.0nto） show that the domain wall structure is widespread and irregularly shaped and the oscillation phase shift △θ, which records as the magnetic force image, changes from 0.29°to 0.81°. Correspondingly, the magnetic force gradient varies from 1.4 ×10^-3 to 4.0× 10^-3 N/m, respectively. In our measurement, the characteristic domain walls, such as Bloch walls, Neel walls and cross-tie walls, are not observed in the film system clearly.     

Hopping Transport and Stochastic Dynamics of Electrons in Plasma Layers

We investigate the stochastic dynamics and the hopping transfer of electrons embedded into two‐dimensional atomic layers. First we formulate the quantum statistics of general atom ‐ electron systems based on the tight‐binding approximation and express ‐ following linear response transport theory ‐ the quantum‐mechanical time correlation functions and the conductivity by means of equilibrium time correlation functions. Within the relaxation time approach an expression for the effective collision frequency is derived in Born approximation, which takes into account quantum effects and dynamic effects of the atom motion through the dynamic structure factor of the lattice and the quantum dynamics of the electrons. In the last part we derive Pauli equations for the stochastic electron dynamics including nonlinear excitations of the atomic subsystem. We carry out Monte Carlo simulations and show that mean square displacements of electrons and transport properties are in a moderate to high temperature regime strongly influenced by by soliton‐type excitations and demonstrate the existence of percolation effects (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)     

不同钝化结构对非极性AlGaN-MSM紫外探测器性能的提升

在r面蓝宝石衬底上,采用金属有机化学气相沉积（MOCVD）法高温生长了未掺杂非极性AlGaN半导体薄膜,在此基础上制备了金属-半导体-金属（MSM）结构的紫外探测器。系统研究了在AlGaN半导体薄膜表面分别磁控溅射SiO₂纳米颗粒与SiO₂钝化层两种钝化手段对非极性AlGaN-MSM结构的紫外探测器性能的影响。实验结果表明：磁控溅射SiO₂纳米颗粒钝化或SiO₂钝化层两种手段都能提升AlGaN-MSM结构紫外探测器性能。暗电流测试表明,SiO₂纳米颗粒和SiO₂钝化层可使器件暗电流下降1~2个数量级,达到nA量级。光谱响应测试发现,在5 V偏压下,探测器在300 nm处具有陡峭的截止边,这表明其具有很好的深紫外特性,光谱响应提高了10³倍,紫外可见抑制比高达10⁵。     

Structure and Phase Composition of Ferriticperlitic Steel Surface after Electrolytic Plasma Quenching

Russian Physics Journal - The paper presents the transmission electron microscopy investigations of the structure and phase composition of ferritic-perlitic ST2 steel surface after electrolytic...     

Microstructure and Crystallographic Texture of Silicon Iron Modified by Torsion Under Quasihydrostatic Pressure

Russian Physics Journal - The electron backscatter diffraction, X-ray diffraction analysis, electromotive force instantaneous measurement, microhardness and coercive force measurement techniques...     

铸铁中硅含量与粒度的关系

本文详细讨论了铸铁试样中硅的测定结果与粒度的关系。     

Excimer Laser Processing of Grey Cast Iron: Microstructural and Tribological Characterization

Pearlitic grey iron was treated by means of a XeCl laser to remelt only a shallow layer. This process allows to modify the heteregeneous surfaces of cast irons in order to improve their tribological behaviour. The energy density ranged from 0.3 to 3 J/cm² and the number of shots from 4 to 40. It is shown that after laser irradiation austenite is formed in the melted layer; compressive stresses at the surface were exhibited as well as the deposition of graphite and the formation of carbides. It is shown that excimer laser processing highly decreases the coefficient of friction and the wear rate. This revised version was published online in August 2006 with corrections to the Cover Date.