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Formation of Nanoscale Intermetallic Phases in Ni Surface Layer at High Intensity Implantation of Al Ions

I.A.Bozhko , S.V.Fortuna , I.A.Kurzina , I.B.Stepanov , E.V.Kozlov , Yu.P.Sharkeev

The results of experimental study of nanoscale intermetallic formation in surface layer of a metal target at ion implantation are presented. To increase the thickness of the ion implanted surface layer the high intensive ion implantation is used. Compared with the ordinary ion implantation, the high intensive ion implantation allows a much thicker modified surface layer. Pure polycrystalline nickel was chosen as a target. Nickel samples were irradiated with Al ions on the vacuum-arc ion beam and plasma flow source "Raduga-5". It was shown that at the high intensity ion implantation the fine dispersed particles of Ni3Al, NiAl intermetallic compounds and solid solution Al in Ni are formed in the nickel surface layer of 200 nm and thicker. The formation of phases takes place in complete correspondence with the Ni-Al phase diagram.

关键词: High intensive ion implantation , null , null

Q相-C2S系统中V2O5对β-C2S稳定性的研究

杨利群 , 祝名伟 , 封汉昌 , 徐先宇

材料科学与工程学报 doi:10.3969/j.issn.1673-2812.2000.03.016

本文研究了Q相-C2S配合料中V2O5对β-C2S的稳定性问题.结果表明,微量V2O5可以稳定β-C2S,使Q相与β-C2S可在常温下共存;Q相-C2S配合料中V2O5/C2S在0.8～1.0%的范围内V2O5稳定β-C2S的效果最好.

关键词: Q相 , C2S , V2O5 , CaO-MgO-Al2O3-SiO2系统

V、Cr固溶稳定β-C2S形成过程研究

马保国 , 柯凯 , 李相国 , 王晓亮

硅酸盐通报

研究了V、Cr对β-C2S形成过程的影响,在生料中分别掺入质量分数0.5%、1.0%、1.5%、2.0%的V2O5、Cr2O3,煅烧至1400 ℃,利用化学分析、XRD、SEM-EDS、高温显微分析等方法,探讨V5+、Cr3+的掺杂影响机理.结果表明:V2O5、Cr2O3均易稳定β-C2S存在,当其掺量分别大于1.0%、1.5%时,对生料易烧性及熟料矿物相的形成均有不利的影响;因V5+与 Al3+离子半径相近,可取代Al3+反应稳定MeO5-4,导致液相粘度增大,而Cr3+与 Fe3+离子半径相近,其对液相作用机理相反;V5+较Cr3+更易固溶在熟料矿物相中,故Cr2O3掺杂影响规律变化相对V2O5在掺量上存在一定的滞后性.

关键词: β-C2S , 液相粘度 , 易烧性 , 固溶

Explanations of the optical spectra and g factor for V3+ ions in ZnX (X = S, Se, Te) crystals

Physica B-Condensed Matter

This paper presents a cluster approach for the calculations of the absorption band positions and the g factor of d(2) tetrahedral cluster. In the approach, the different modifications of e and t(2) orbitals of d electrons and the contribution from the spin-orbit coupling of ligands to the EPR g factor due to the mixing of d(2) ions with the ligands are considered. The calculated band positions and g factor for ZnX : V3+ (X = S, Se, Te) crystals show good agreement with the observed values by using only two adjustable parameters. The contribution from the spin-orbit coupling of ligands to the g factor is discussed. (C) 1998 Elsevier Science B.V. All rights reserved.

关键词: crystal- and ligand-field theory;optical spectra;electron paramagnetic;resonance;spin-orbit coupling;V3+ ZnX (X = S, Se, Te);vanadium centers;znte crystals

RE-N-C-S-V-Nb多元共渗H13钢的热疲劳性能研究

徐永礼 , 庞祖高 , 马宽猷 , 韦曼云 , 黄银燕

表面技术

利用扫描电镜、X射线衍射分析技术,对比经过RE-N-C-S-V-Nb多元共渗处理、气体渗氮处理和淬火+回火处理的H13钢三种试样的热疲劳性能,依据裂纹特征、裂纹结构,证明RE-N-C-S-V-Nb多元共渗H13钢具有较强的抗热疲劳性能.研究了多元共渗钒铌碳氮化物的细晶强化作用和位错强化作用,及其对钢热稳定性、高温硬度和抗氧化性的影响,从理论上揭示了RE-N-C-S-V-Nb多元共渗对热疲劳性能的强化机制.

关键词: H13钢 , 多元共渗 , 热疲劳性 , 热稳定性 , 抗氧化性

Corrosion behavior of TiN and TiN/Ti composite films on Ti6Al4V alloy in Hank's solution

Journal of Applied Electrochemistry

Surface films of TiN and TiN/Ti were deposited on Ti6Al4V alloy by arc ion plating (AIP). Open-circuit potential, potentiodynamic polarization tests and electrochemical impedance spectroscopy (EIS) were employed to investigate the corrosion performance of TiN and TiN/Ti films in Hank's simulated body fluid at 37 A degrees C and pH 7.4. Scanning electron microscopy (SEM) was used to study the surface morphology of the corroded samples after the potentiodynamic polarization tests. The results show that the TiN and the TiN/Ti films can provide effective protection for the Ti6Al4V substrate in Hank's fluid, and the TiN/Ti composite film showed a corrosion resistance superior to that of the TiN film. The outer TiN layer of the composite film mainly acted as an efficient barrier to corrosion during short-term experiments. In contrast to the bare Ti6Al4V, no pitting was observed on the surface of the TiN and TiN/Ti films deposited on the bare alloy after potentiodynamic polarization.

关键词: Corrosion;Arc ion plating;TiN film;TiN/Ti composite film;Ti6Al4V;coatings;biocompatibility;resistance;titanium

Ag离子注入Ti6Al4V合金抗Hank's溶液腐蚀性能研究

冷崇燕 , 周荣 , 张旭

稀有金属材料与工程

采用注入不同剂量5×1016,1×1017,5×1017和9×1017ions/cm2,加速电压30kV对Ti6Al4V合金进行Ag离子注入表面改性.使用动电位极化曲线研究Ag离子注入前后Ti6Al4V合金抗Hank's溶液腐蚀性能,利用小角掠射X射线衍射技术研究Ag离子注入前后Ti6Al4V合金表面物相组成,用X射线光电子能谱技术分析离子注入合金表面和腐蚀样品表面元素存在的化合态.结果表明,Ag离子注入提高了合金抗Hank's溶液腐蚀性能,腐蚀电流密度随Ag离子注入剂量的增加稍有变化.离子注入Ti6Al4V合金表面的氧化物腐蚀阻挡层、离子注入表面合金层和表面生成的Ag和TiAg有利于合金抗Hank's溶液腐蚀性能的改善.

关键词: Ti6Al4V , Ag离子注入 , 抗腐蚀性能

Hank’S溶液中注碳Ti6A14V合金缝隙试样的电化学行为

杨慧 , 梁成浩 , 黄乃宝

材料科学与工艺

为探索碳离子注入Ti-6A1-4V合金在人工模拟体液Hank’s溶液中的性能，采用电化学方法、扫描电子显微镜和X射线衍射对其缝隙试样在人工模拟体液Hank’s溶液中的电化学行为进行了研究，结果表明：碳离子注入后，Ti-6A1-4V合金缝隙试样的腐蚀电位升高、电荷转移电阻增大，阳极极极化电流密度降低，改善了电化学性能；碳离子注入后，Ti-6A1-4V合金表面形成主要由TiC组成的无序层膜，该膜层阻滞了合金元素的溶解，提高了合金的耐缝隙腐蚀性能。

关键词: 碳离子注入 , Ti-6A1-4V合金 , Hank’s人工模拟体液 , 缝隙腐蚀行为

RE-N-C-S-V-Nb多元共渗H13钢的高温耐磨性

徐永礼 , 覃海泉 , 庞祖高 , 徐宇 , 徐仁强 , 郑勇

表面技术 doi:10.16490/j.cnki.issn.1001-3660.2015.04.011

目的：研究RE-N-C-S-V-Nb多元共渗H13钢的高温耐磨性,为避免铝型材挤压模具的早期磨损失效提供表面强化的新工艺。方法把多元共渗试样及对比试样进行高温摩擦磨损实验,然后利用金相显微镜、扫描电镜、能谱分析仪、X射线衍射仪等设备进行检测分析。结果淬火试样和软氮化试样均存在较严重的磨粒磨损和粘着磨损现象,渗层有微裂纹,高温摩擦系数曲线有明显的波动和峰值,磨损率分别为21.20×10-13,11.30×10-13 m3/(N·m),在560℃保温4 h后的显微硬度分别为584,1018HV0.1。RE-N-C-S-V-Nb多元共渗试样以微量氧化磨损和微量粘着磨损形式出现,渗层无裂纹,高温摩擦系数曲线平缓,磨损率仅为2.96×10-13 m3/(N·m),显微硬度高达1334HV0.1。结论 RE-N-C-S-V-Nb多元共渗H13钢具有较强的高温耐磨性。

关键词: 多元共渗 , 高温耐磨性 , 摩擦系数 , 磨损率

Ti-6Al-4V合金氮离子注入后在Tyrode's体液中的耐蚀耐磨性能

于乾乾 , 梁成浩 , 黄乃宝 , 李杰兰 , 王树森 , 贾理男

材料保护

Ti-6Al-4V合金注入氮离子后,生物相容性、抗磨损性、抗疲劳性及抗腐蚀性均有所提高,其植入人体后在体液中的耐蚀耐磨性能尤为重要,目前对此研究较少.对Ti-6Al-4V合金进行氮离子注入,并在人工模拟体液Tyrode's溶液中进行摩擦磨损和电化学试验,研究了注氮Ti-6Al-4V合金的耐蚀耐磨性能.采用扫描电镜观察腐蚀形貌,用其自带的能谱仪分析注氮层的元素组成,采用X射线衍射仪分析注氮层的结构.结果表明:Ti-6Al-4V氮离子注入后表面形成主要由TiC,Ti及少量TiO2组成的膜层,硬度提高,在Tyrode's溶液中的腐蚀电位升高、极化电阻增大,阳极极极化电流密度降低;在Tyrode's溶液中摩擦后的注氮Ti-6Al-4V合金的阳极极化电流密度大于未摩擦的,极化电阻减小;Ti-6Al-4V合金氮离子注入后的摩擦系数明显降低,比磨损率减少.

关键词: 氮离子注入 , Ti-6Al-4V合金 , Tyrode's溶液 , 电化学性能 , 耐蚀性能 , 摩擦性能

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