检索结果-南通市图书馆

Investigation on the Tribology of Co Implanted Stainless Steel Using Metal Vapor Vacuum Arc ion Source

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2004年第3期20卷 265-268页

作者： Junxia GUO Xun CAI Qiulong CHEN Key lab for High Temperature Materials and Testing, shanghai Jiao Tong University, shanghai 2.0030, china lab. for High Temp. Mat. and Testing Shanghai Jiaotong Univ. Shanghai 200030 China

AISI 304 stainless steel was ion implanted with Co, and the tribological property on the surface of the stainless steelwas investigated. The Co ion implantation was carried out using a metal vapor vacuum arc (Mevva) broad-beam ionsource with an extraction voltage of 40 kV, implantation doses of 3×10^(17)/cm^2.and 5×10^(17)/cm^2. and ion currentdensities of 13, 2. and 32.A/cm^2. The results showed that the near-surface hardness of Co-implanted stainless steelsample was increased by 50% or more, and it increased with increasing ion current density at first and then declined.The friction coefficient decreased from 0.74 to 0.2. after Co implantation. The wear rate after Co implantationreduced by 2.% or more as compared to the unimplanted sample. The wear rate initially decreased with increasingion current density and then an increase was observed. Within the range of experimental parameters, there existsa critical ion current density for the Co-implanted stainless steel, at which the wear rate decreased with increasingretained dose, going through a minimum and then increased. The critical ion current density in this paper is about2.μA/cm^2.

关键词： Tribology Metal vapor vacuum arc Cobalt Implanted stainless steel

A Simulator for Producing of High Flux Atomic Oxygen beam by Using ECR Plasma Source

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2004年第6期20卷 759-762页

作者： Shuwang DUO, Meishuan LI and Yaming ZHANGShenyang National laboratory for Materials Science, {2. of Metal Research, chinese academy of sciences, Shenyang 110016, china Shenyang Natl. lab. for Mat. Sci. Inst. of Metal Res. Chinese Acad. of Sci. Shenyang 110016 China

In order to study the atomic oxygen corrosion of spacecraft materials in low earth orbit environment, an atomic oxygen simulator was established. In the simulator, a 2.45 GHz microwave source with maximum power of 600 W was launched into the circular cavity to generate ECR (electron cyclotron resonance) plasma. The oxygen ion {2. moved onto a negatively biased Mo plate under the condition of symmetry magnetic mirror field confine, then was neutralized and reflected to form oxygen atom {2.. The properties of plasma density, electron temperature, plasma space potential and ion incident energy were characterized. The atomic oxygen {2. flux was calibrated by measuring the mass loss rate of Kapton during the atomic oxygen exposure. The test results show that the atomic oxygen {2. with flux of 1016-1017 atoms-cm-2.s-1 and energy of 5-30 eV and a cross section of φ80 mm could be obtained under the operating pressure of 10-1-10-3 Pa. Such a high flux source can provide accelerated simulation tests of materials and coatings for space applications.

关键词： Atomic oxygen Low earth orbit space environment ECR plasma Microwave

Properties of Reactive Magnetron Sputtered ITO Films without in-situ Substrate Heating and Post-deposition Annealing

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2000年第3期16卷 281-285页

作者： Meng CHEN, Xuedong BAI, Jun GONG, Chao SUN, Rongfang HUANG and Lishi WEN (institute of Metal Research, the chinese academy of sciences, Shenyang 110015,{2.) ion beam {2.. Shanghai Institute of Metallurgy Chinese Academy of Sciences Shanghai 200050 China institute of Metal Research Chinese Academy of Sciences Shenyang 110015 China

Indium tin oxide (ITO) films were prepared on polyester, Si and glass substrate with relatively high deposition rate of above 0.9 nm/s by DC reactive magnetron sputtering technique at the sputtering pressure of 0.06 Pa system, respectively. The dependence of resistivity on deposition parameters, such as deposition rate, target-to-substrate distance (TSD), oxygen flow rate and sputtering time (thickness), has been investigated, together with the structural and the optical properties. It was revealed that all ITO films exhibited lattice expansion. The resistivity of ITO thin films shows significant substrate effect: much lower resistivity and broader process window have been reproducibly achieved for the deposition of ITO films onto polyester rather than those prepared on both Si and glass substrates. The films with resistivity of as low as 4.2. x 10^-4 Ω.cm and average transmittance of ～78% at wavelength of 400～700 nm have been achieved for the films on polyester at room temperature.

关键词： ITO Properties of Reactive Magnetron Sputtered ITO Films without in-situ Substrate Heating and Post-deposition Annealing TSD rate than

HgCdTe红外探测器离子注入剂量优化研究

在线全文

学校读者我要写书评

暂无评论

物理学报 2004年第3期53卷 911-914页

作者：陈贵宾陆卫蔡炜颖李志锋陈效双胡晓宁何力沈学础中国科学院上海技术物理研究所红外物理国家重点实验室

在中波响应波段的p型Hg0 70 9Cd0 2.91 Te(MCT)分子束外延生长薄膜上 ,利用材料芯片技术获得叠加注入不同硼离子剂量的系列大光敏元面积 (5 0 0 μm× 5 0 0 μm)的n_op_p结 .通过测量液氮温度下不同离子注入剂量单元的电流电压特性... 详细信息

在中波响应波段的p型Hg0 70 9Cd0 2.91 Te(MCT)分子束外延生长薄膜上 ,利用材料芯片技术获得叠加注入不同硼离子剂量的系列大光敏元面积 (5 0 0 μm× 5 0 0 μm)的n_op_p结 .通过测量液氮温度下不同离子注入剂量单元的电流电压特性和对零偏微分电阻R0 分析 ,观测到p_n结的性能与硼离子注入剂量明显的依赖关系 .在另一片薄膜材料(镉组分值为 0 2.74 3)上通过该方法获得R0

关键词：碲镉汞薄膜红外探测器离子注入分子束外延 p-n结暗电流特性

High　Energy　He+　ion　Implantation　in　Titanium　Doped　Sapphire　Crystal

在线全文

学校读者我要写书评

暂无评论

chinese Journal of Lasers 1995年第6期B4卷 563-569页

作者： LIU Jianhua ZHANG Qiang DENG Peizhen GAN Fuxi(shanghai institute of Optics and Fine Mechanics , Academia Sinica,shanghai 2.1800, china)Received 3 Apr. 1995 Revised manuscript received 7 Jun. 1995(Supported by the fund of national lab. of information fun shanghai Inst of Optics and Fine Mechanics Academia Sinica Shanghai China

The 2.MeV energy He＋ ion implantation for constructing planar optical waveguide in tunable laser crystal Ti:Al2.3 was performed. Lattice damage by ion bombardmentwas investigated by means of optical and SEM studies, different damage depths of about 5 μmand 10μm for Al-sublattice and O-sublattice of the Ti:Al2.3 substrate were obtained by electron probe microanalysis (EPMA).

关键词： high energy ion implantation optical waveguide Ti:Al2.3 crystal

Raman Spectroscopy Characterization of ion-{2.-modified Polyimide Films

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

真空科学与技术学报 1992年第Z1期23卷 195-198页

作者： Done Xu, Xinglong Xu, Shichang Zou ion beam {2.., shanghai institute of Metallurgy, Academia Sinica, 865 Changning Road, shanghai 200050, People’s Republic of china

Raman spectroscopy was employed in studying the effects of irradiation conditions on the structural modifications of irradlated polyimide films. A decomposing approach of data analysis for the experimental Raman spectra demonstrates that the implantation conditions play important but different roles in the formation of the final structures. A calculation was also performed to find out the contribution from the phonon state density of amorphous graphite to the Raman spectrum profiles.

关键词：白油专心

Study of proton resonances in ^(18)Ne via resonant elastic scattering of ^(17)F+p and its astrophysical implication

在线全文

学校读者我要写书评

暂无评论

Science china(Physics,Mechanics & Astronomy) 2011年第S1期54卷 32-36页

作者： HE JianJun1, HU Jun1,2. XU ShiWei1, CHEN ZhiQiang1, ZHANG XueYing1, WANG JianSong1, YU XiangQing1, ZHANG LiYong1,2. LI Long1,2. YANG YanYun1,2. MA Peng1,2. ZHANG XueHeng1, HU ZhengGuo1, GUO ZhongYan1, XU Xing1,2. YUAN XiaoHua1, LU Wan1,2. YU YuHong1, ZANG YongDong1,2. TANG ShuWen1,2. YE RuiPing1,2. CHEN JinDa1,2. JIN ShiLun1,2. DU ChengMing1,2. WANG ShiTao1,2. MA JunBing1,2. LIU LongXiang1,2. BAI Zhen1,2. LEI XiangGuo1, SUN ZhiYu1, ZHANG YuHu1, ZHOU XiaoHong1, XU HuShan1, SU Jun3, LI ErTao3, WANG HongWei4, TIAN WenDong4 & LI XiangQing5 1 institute of Modern Physics (IMP), chinese academy of sciences, Lanzhou 730000,{2. 2.Graduate University of chinese academy of sciences, Beijing 100049,{2. 3{2. institute of Atomic Energy (CIAE), Beijing 102.13,{2. 4 shanghai institute of Applied Physics (SINAP), chinese academy of sciences, shanghai 2.1800,{2. 5 School of Physics and State Key laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871,{2. 1. institute of Modern Physics (IMP) Chinese Academy of Sciences Lanzhou 730000 China2. Graduate University of Chinese Academy of Sciences Beijing 100049 China3. China Institute of Atomic Energy (CIAE) Beijing 102413 China4. Shanghai Institute of Applied Physics (SINAP) Chinese Academy of Sciences Shanghai 201800 China5. School of Physics and State Key Laboratory of Nuclear Physics and Technology Peking University Beijing 100871 China

The proton resonant properties in 18Ne, which determine the reaction rate of the key stellar 14O(α,p)17F reaction, have been studied by using a technique of proton resonant elastic scattering of 17F+p. A 4.2. MeV/nucleon 17F radioactive ion (RI) beam was produced via a projectile-fragmentation reaction, and separated by a Radioactive ion beam Line in Lanzhou (RIBLL). By bombarding a thick (CH2.n target, the energy spectra of the recoiled protons were measured by two ΔE-E silicon telescopes at the center-of-mass scattering angles of θc.m.≈175°±5°, θc.m.≈152.±8°, respectively. Several proton resonances in 18Ne were ob served clearly. A further R-matrix analysis of the experimental data is under way to determine the resonant parameters. The present work reports the preliminary results briefly.

关键词： resonant reaction reaction rate explosive burning accreting binary systems

注入离子在无定形固体靶中投影射程分布的统计特性

在线全文

学校读者我要写书评

暂无评论

物理学报 1995年第3期44卷 479-487页

作者：邵其鋆潘正瑛复旦大学物理二系

用基于两体碰撞近似的动态蒙特-卡罗模拟方法和Boltzmann输运方程近似解法,研究注入离子在无定形固体靶中投影射程分布的统计特性.讨论注入物理参数对表征射程统计分布的平均投影射程、分布的标准偏差、偏度和峰度等的影响.计算结果与... 详细信息

用基于两体碰撞近似的动态蒙特-卡罗模拟方法和Boltzmann输运方程近似解法,研究注入离子在无定形固体靶中投影射程分布的统计特性.讨论注入物理参数对表征射程统计分布的平均投影射程、分布的标准偏差、偏度和峰度等的影响.计算结果与有关实验数据比较符合得较好.

关键词：注入离子固体靶射程分布统计特性

EFFECTS OF ACTIVE ELEMENTS Y AND Ce ON HIGH TEMPERATURE OXIDATion OF Fe-2.Cr-40Ni ALLOY

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 1992年第11期5卷 383-390页

作者： YU Fanghua YANG Guohua shanghai institute of Nuclear Research,Academia Sinica,shanghai,chinaHAN Rongdian WENG Huimin University of Science and Technology of china,Hefei,chinaSHEN Jianian Corrosion Science laboratory,institute of Corrosion and Protection of Metals Academia Sinica,Shenvang,china shanghai Inst of Nuclear Research Acad Sinica Shanghai China

The effects of small amount(≥0.05%)of active elements Y and Ce in Fe-2.Cr-40Ni al- loy have been investigated on the kinetics of early stage of high temperature oxidation as well as composition and microsructure of oxide film by ion backscattering and slow positron *** results show that Y and Ce can reduce evidently the high tem- perature oxidation rate of FeCrNi alloy at early stage and can effectively enhance the Cr_2._3 formation and retard the oxide formation of Fe and Ni in the surface layer thus the microstructure of the oxide film is improved.Y and Ce enter the oxide film and concentrate within several tens nanometres from surface of the outer *** mech- anism of oxidation resistance for Ce is different from *** can decrease the density of vacancy defects in oxide layer,so the cations are restrained from diffusion outward through *** Y can control the outward diffusion of cations through va- cancies at the early statge of oxidation(shorter than 12.min),aften that restrained the cations from diffusion outward along grain boundaries up to 60 min oxidation.

关键词： ion backscattering slow positron beam oxidation active elements FeCrNi alloy