最新刊期
      卷 0 ， 期 0 ， 2020
      • MEI Xianxiu WANG Zhong HAO Shengzhi QIN Ying LIN Guoqiang DONG Chuang
        Vol. 32, Issue 3, (2009)
        摘要：Aluminum films of 3 μ m were deposited on DZ4 alloy by multi-arc ion plating, and were treated by HCPEB (high-current pulse electron beam) at 27 kV in a flux density of 1.5 J/cm2 with the pulse frequency being 1, 5 or 10. SEM images of the samples show that the Al film treated by one pulse became leveled, and the surface smoothness increased with the pulse frequency, but the film treated by 10 pulses had obvious micro crack appearance. Melt pit and eruption phenomenon were observed in the treated films, with the 5-pulse treated being the most obvious. Scanning electron probe microscopy analysis of the film cross-section revealed that the film had been mixed with the substrate. Glancing incidence XRD analysis of the films indicated that, with increasing pulse frequency, the film’s Al content reduced, and the Ni content of the substrate increased. The film treated by one pulse had non-crystalline phase, while the multi-pulse processed films had new phase of NiAl, which is advantageous in improving anti-corrosive performance enhancement of the film. An improvement of about 70% was observed in corrosion electric potential test of the 10-pulse irradiated film.  
        关键词：High-current pulse electron beam;DZ4 alloy;Surface alloying   
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        发布时间：2021-03-12
      • PENG Shixiang ZHANG Meng ZHAO Jie XU Rong REN Haitao LU Pengnan SONG Zhizhong YU Jinxiang YUAN ZHongxi GUO Zhiyu
        Vol. 32, Issue 3, (2009)
        摘要：An injection system of 50mA@50keV D+ ion beam is needed for thermal neutron radiography based on 2 MeV RFQ at PKU. Its duty factor is 10%. The RMS emmitance is 0.20 π·mm·mrad with α=1.93 and β=5.16 cm/rad. To achieve these specifications, we developed an ion source test bench and a LEBT test bench based on a permanent magnet 2.45 GHz microwave-driven ion source (ECR). When the microwave power is less than 450 W, the total extracted H + current is larger than 80 mA, and the proton fraction is better than 90%. The RMS emmitance is about 0.2–0.3 π·mm·mrad. With a semi-closed solenoid, the transport efficiency of LEBT is better than 80%. In addition, studies were conducted on influence of liner material and size of the inner diameter.  
        关键词：Injector;Emmitance;Beam current;Transport efficiency;Microwave-driven ion source;LEBT   
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        发布时间：2021-03-12
      • REN Kefei YING Mingli ZHOU Changwei FU Dejun
        Vol. 32, Issue 3, (2009)
        摘要：A middle-frequency magnetron sputtering with anode-layer ion source assistance was designed and AlN films were deposited on Si(111) substrates by using this system. The structure and composition of the films were characterized by X-ray diffraction, atomic force microscopy and scanning electron microscopy. The films deposited under optimal conditions have strong diffraction of AlN (002) and the FWHM of (002) peaks from different film samples ranges of 612 – 648 arcsec. Gas flow rate, the substrate bias and the application of anode-layer ion source are of obvious influence to the AlN film structure.  
        关键词：Middle-frequency magnetron sputtering;AlN;Anode-layer ion source   
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        发布时间：2021-03-12
      • SUN Liangting1 ZHAO Hongwei1 ZHANG Xuezhen1 LI Jinyu1 WANG Hui1 MA Baohua1 GUO Xiaohong1 SHANG Yong1 LI Xixia1 SHA Shan1 XIE Dan2 1
        Vol. 32, Issue 3, (2009)
        摘要：Electron Cyclotron Resonance (ECR) ion source is regarded as the most efficient machine to produce stable multiple charge state ion beams. Because of the special characteristics, all-permanent magnet ECR ion sources have been widely adopted around the world to produce stable ion beams of multiple charge state with good repetition and high duty factor for compact research platforms and ion beam implanters. In this paper, all-permanent magnet ECR ion sources developed at IMP are presented, and typical parameters and performances are discussed. The high charge state source, LAPECR2, is mainly used to produce intense high charge state ion beams, and the LAPECR1 source is designed to produce intense ion beams of medium and low charge state. An improved LAPECR1-M is specially designed to produce heavy metal ion beams of low charge state. These ECR ion sources have been adopted by different experimental terminals at IMP and, with their nice performance, many experimental studies could be possible.  
        关键词：ECR ion source;All-permanent magnet ion source;Multiple charge state ion   
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        发布时间：2021-03-12
      • WANG Hefeng1,2 YANG Chengquan2 LI Xiuyan1 TANG Bin1 1
        Vol. 32, Issue 3, (2009)
        摘要：TiO2 films with excellent bonding strength were fabricated on stainless steel substrate by plasma surface alloying and thermal oxidation duplex processing. Controllable elemental distribution and structure of the films could be achieved at 400–600℃. The films were characterized by metallography, glow discharge spectrometer (GDOES) and X-ray diffraction. The results show that the TiO2 films are of dense and uniform anatase. The Ti and O contents of the films are in gradient distribution. Phenol-containing wastewater was used to test photo-catalytic performance of the films. The TiO2 films have a degradation rate of phenol of about 73.5% in 3 h, much higher than commercial products of TiO2 powders.  
        关键词：TiO2;Photo-catalytic;Complex plasma surface treatment   
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        发布时间：2021-03-12
      • YAN Sha1 SHANG Yijun1 SONG Jinxia2 LE Xiaoyun3 ZHAO Weijiang1 XUE Jianming1 WANG Yugang1 1
        Vol. 32, Issue 3, (2009)
        摘要：Thermal barrier coating (TBC) is used for enhancing the working temperature of high temperature alloys. Its thermal stability directly decides service life of the high temperature parts protected by TBC. In this work, intense pulsed ion beam (IPIB) irradiation was used to obtain stability-improved TBC of ZrO2/NiCoCrAlY layers. The IPIB irradiation with proper parameters could form a mixing layer at the interface of ZrO2/NiCoCrAlY with improved thermal stability. The best TBC could be formed under the following IPIB parameters: peak energy of 300keV, pulse duration of 65ns, and current density of 250A/cm2. We owe the enhanced thermal stability of the TBC to the IPIB-induced elemental re-distribution, hence a protection layer under the thermal oxidation working condition, with reduced mismatch and stress between the layers.  
        关键词：Intense pulsed ion beam;Thermal barrier coat;Molten state mixing   
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        发布时间：2021-03-12
      • YU Shiji DING yaogen ZHANG Honglai JIANG Zhenbai
        Vol. 32, Issue 3, (2009)
        摘要：Test method is decisive for capability evaluation of a cathode. In this paper,a system with an electron gun structure for performance tests of thermionic cathode is reprted. Emission performances of several kinds of impregnated cathode (M-type cathode) were tested. The results proved that this system for cathode performance evaluation is useful. Improvements in the designing the electron gun structure have been made,based on findings in the test.  
        关键词：M-type Cathode;Electron gun structure;Test;Design   
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        发布时间：2021-03-12
      • ZHANG Li TANG Guangze MA Xinxin
        Vol. 32, Issue 3, (2009)
        摘要：Carbon diffusion behavior at 850℃ in 45# steel under 1 keV high-flux Ar+ ion irradiation was investigated. The steel samples had been pre-decarburized at 850℃ in H2 +H2O for 2 h to form a columnar ferrite surface layer of 200 μm. Cross-section structure of the samples indicates that,at the dual phase zone,carbon diffuses to the surface,especially in grain boundaries,leading to the movement of phase boundary between the ferrite and austenite phases towards the surface. Under the ion irradiation,however,the carbon diffusion is restrained,as can be seen by comparing the irradiated samples to the non-irradiated. This effect cannot be explained by any established mechanism of radiation-influenced diffusion. An explanation based on nonlinear effect is proposed.  
        关键词：45# carbon steel;Ion irradiation;Decarburizing;Nonlinear   
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        发布时间：2021-03-12
      • ZHAO Jie PENG Shixiang LV Pengnan ZHANG Meng REN Haitao XU Rong YU Jinxiang SONG Zhizhong YUAN Zhongxi GUO Zhiyu
        Vol. 32, Issue 3, (2009)
        摘要：In this paper,we report progresses in upgrading the 1 MeV RFQ accelerator at Peking Uiniversity. Using the low energy beam transport (LEBT) system with two einzel lenses,over 6 mA peak beam current of 22 keV O + ions can be obtained at the end of LEBT at duty faction of 16. The normalized RMS emittance of 90% of the beam is about 0.12 πmm·mrad. Test results of another electrostatic LEBT for high-current H+ ion beams are reported,too.  
        关键词：Einzel lens;Microwave ion source;LEBT   
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        发布时间：2021-03-12
      • ZHOU Kui1 ZHANG Xu1 WU Xianying1 WU Zhenglong2 DENG chunfeng1 1
        Vol. 32, Issue 3, (2009)
        摘要：Nanocomposite nc-ZrCN/a-C:H(N) films were prepared on silicon substrates by filtered cathodic vacuum arc technique using the C2H2 and N2 gas as the precursor. The microstructure,composition and properties of the films were investigated by X-ray diffraction (XRD),energy dispersive X-ray analysis (EDXA),X-ray photoelectron spectroscopy (XPS),high resolution scanning electron microscopy and nanoindenter. The results show that the film is composed of ZrCN and amorphous carbon. The Zr content of the films decreases with increasing flow rate of the C2H2/N2 gas mixture,and hardness of a film decreases with increased C and N contents in the film.  
        关键词：Filtered cathodic vacuum arc technique;Nanocomposite;Flow rate   
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        发布时间：2021-03-12
      • CAI Zhihai ZHANG Ping JUN Tan HE Jiawu
        Vol. 32, Issue 3, (2009)
        摘要：Using multi-arc ion plating technique,YT14 cemented carbide milling cutters were coated with CrTiAlN composite films. Effects of the bias voltage on morphology,hardness and adhesion strength were investigated with nano-indenter,scratch test,scanning electron microscopy and X-ray diffraction. The results show that the CrTiAlN coating contains mainly Cr,Ti,A,N and O. Cr,CrN,Cr2N and TiN crystal phases and AlN phase were formed during the ion plating process. Cutting performance of the tools coated with TiN,TiAlN or CrTiAlN was studied under dry cutting conditions. Cutting life for the tools is in sequence of CrTiAlN > TiAlN > TiN > uncoated. The wearability characteristics of the composite coatings were discussed.  
        关键词：CrAlTiN composite coatings;Cemented Carbide Cutting Tools;Cutting performance   
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        发布时间：2021-03-12
      • CAO Shuchun1,2 ZHANG Ziming1 LI Zhongping1 WAN Ming1 LIU Ming1 ZHANG Yingfa1 SU Yalong1,2 LU Xihong1 Jing Yi1 XIAO Rongqing1 YUAN Ping1 1
        Vol. 32, Issue 3, (2009)
        摘要：DG-series industrial electron accelerators of intermediate frequency transformer type have been successfully researched and developed in the Institute of Modern Physics,Chinese Academy of Science. The DG-2.5 accelerator with beam energy range of 1.0-2.5MeV,maximum beam power of 90 kW and length of extraction window up to 1000 mm,is suitable for many kind uses of the radiation technology. DG-1.2 accelerator,another type with beam energy range of 0.8-1.2 MeV and beam power of 50 kW,was also designed and constructed. The two accelerators have been tested with long-term operations. They were proved as E-beam irradiators of high reliability,very low malfunction rates and high efficiency.  
        关键词：Electron accelerator;Beam energy;Beam power;Industrial radiation   
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        发布时间：2021-03-12
      • CHEN Yan 1 LIU Yingmin1 ZHAO Ziqiang1 LAN Ding2 WANG Yuren2 1
        Vol. 32, Issue 3, (2009)
        摘要：Bombarded by MeV Au ions at LN temperature,spherical polystyrene (PS) particles were changed into ellipsoids. The anisotropic deformation of PS particles differs from SiO2 particles. After irradiation,a PS particle shrinks apparently. The diameter in the direction of beam incidence decreased more severely than in the direction vertical to beam incidence,leading to ellipsoidal shape of the irradiated particles. By covering the PS photonic crystal with a copper mask,deformed PS particles can be made in specific areas of the photonic crystal. This work could be of help for future investigation of introducing controllable defect in photonic crystal.  
        关键词：Photonic crystal;PS particle;Ion beam;Anisotropic deformation   
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        发布时间：2021-03-12
      • HAO Shengzhi1 LI Mincai1 ZHANG Xiangdong1,2 GROSDIDIER Thierry2 DONG Chuang1 1
        Vol. 32, Issue 3, (2009)
        摘要：Mechanism of surface modification technique by high current pulsed electron beam (HCPEB) was studied with SKD11 steel samples. It was found that crater-like defects would formed on the irradiated surface,the area density of craters and surface roughness decreased with the increasing number of HCPEB pulses. According to the XRD patterns,carbides in the modified surface layers dissolved after several HCPEB pulses and a high-percentage austenite microstructure is formed,but excessive energy deposition resulted in decomposition of the austenite. Treating the samples at 19.8 kV,the wear resistance of modified SKD11 steel improved and the greatest enhancement occurred at 8 pulses. Discussions were given on changes in contents of carbide and austenite in the surface layers.  
        关键词：High current pulsed electron beam (HCPEB);Crater;Roughness;Microstructure;Wear resistance   
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        发布时间：2021-03-12
      • WANG Hongjun HE Jun LI Meng ZHOU Lin REN Kefei LIU Chuangsheng GUO Liping FU Dejun
        Vol. 32, Issue 3, (2009)
        摘要：CdMnS films were prepared by and co-evaporation,and their properties were studied. The results showed CdMnS are hexagonal structure and possesses ferroelectric properties. A remnant polarization of 1.72 μC/cm2 and coercive field of 14.3 kV/cm. The co-evaporated CdMnS samples become ferromagnetic when doped with Au,with a spontaneous magnetization of 1.39×10-6 emu and a coercive magnetic field of 75.4 gauss at 10 K,and the Curie point was higher than room temperature. Using magnetic force microscopy,we observed clear magnetic clusters with sizes ranging from a few nanometers to 100 nm,and found the magnetization to be highly dependent on Au concentration.  
        关键词：CdMnS;Ferroelectricity;Ferromagnetic;Memory devices   
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        发布时间：2021-03-12
      • HU Chundong ZHANG Xiaodong
        Vol. 32, Issue 3, (2009)
        摘要：Effects of discharge regulation parameters and secondary gas input on arc current of a 22-cm duopigatron ion source were studied. Several measures were taken to obtain stable long-pulse arc current of high intensity. The improved ion source is useful for getting high quality arc current in the next step experiment. Besides,it has a significant meaning to improve performance of the ion source,and to realize quasi-steady operation mode of the NBI system.  
        关键词：Arc characteristic;Duopigatron ion source;Arc current;Neutral beam injector   
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        发布时间：2021-03-12
      • HU Wenjuan1 CHEN Qiang1 XIE Fenyan2 CAI Huiping1 1
        Vol. 32, Issue 3, (2009)
        摘要：The study was aimed at producing plasma polymerized acrylic acid (PPAA) functional coating for biomedical applications. Dielectric barrier discharge (DBD) was used to deposit functional films from acrylic acid vapors. The films were characterized by water contact angle,Fourier-transform infrared spectroscopy (FT-IR),X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM). By in vitro cell culture and rich blood platelet adhesion tests,effects of the film structure and chemical components on biocompatibilities of the films were studied. The results show that plasma parameters of pulse frequency,plasma power,discharge mode,gas pressure,and duty cycle,have great influence on PPAA coatings,and efficient cell adhesion of the PPAA coatings surface was demonstrated. Biological effects of the functional coatings were discussed in detail.  
        关键词：Pulsed dielectric barrier discharge;PPAA;Duty cycle;Cell adhesion   
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        发布时间：2021-03-12
      • HUANG Lei WANG Langping WANG Xiaofeng YAN Jiuchun XIE Zhiwen LU Yang
        Vol. 32, Issue 3, (2009)
        摘要：Small output and Gauss density distribution of metal plasmas at the exit of traditional filtered cathodic vacuum arc system become an obstacle of industrial application of plasma immersion ion implantation and deposition technology. Therefore,obtaining large area uniform metal plasmas is a focus of research. We have built a large area uniform metal plasmas system,with multi-cathodes installed symmetrically and a central solenoid. Metal plasmas output of 600 mm in diameter can be obtained. The results of deposition probe tests show that the presence of solenoid current has large influence on deposition uniformity. For a single source,the deposition uniformity in X-direction is better than that of Y-direction. With four sources,the ion current density is about 5.5 times more than that of a single source,and the maximum deposition uniformity is 83.8%.  
        关键词：PIII&D;Large area;Metal plasmas;Deposition uniformity   
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        发布时间：2021-03-12
      • XIE Zhiwen WANG Langping WANG Xiaofeng YAN Jiuchun HUANG Lei LU Yang
        Vol. 32, Issue 3, (2009)
        摘要：Ti/DLC multilayer was synthesized on 2Cr13 substrate using plasma immersion ion implantation and deposition (PⅢ&D). Structure and mechanical performance were characterized. The results showed that the multilayer has a good periodicity. The micro-hardness of the multilayer was improved obviously compared with the single-layer film. The multilayer with relatively low micro-hardness exhibited high adhesion strength and wear resistance. It can be concluded that the multilayer not only maintains the low coefficient characteristic of the single DLC film,but also improves the load bearing capacity and the adhesion strength between the film and substrate.  
        关键词：Plasma immersion ion implantation and deposition;Adhesion strength;Multilayer   
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        发布时间：2021-03-12
      • ZHANG Junfeng CHEN Qiang LIU Fuping LIU Zhongwei
        Vol. 32, Issue 3, (2009)
        摘要：Neutral radicals or small molecules were the precursor for film growth,but what plays a major role depends on the discharge conditions and films deposited. In our lab,we use (CH3)3-Si-O-Si-(CH3)3,or hexamethyldisiloxane (HMDSO),as monomer,and plasma enhanced chemical vapor deposition (PECVD),to deposit silicon dioxide. This paper is emphasized on the neutral radicals and small molecules diagnosed in situ by quadrupolar mass spectrometer. The influence of operation parameter,such as input power,working pressure,and the gas flow rate of O2 and HMDSO,on the film synthesis were investigated. The mass spectra revealed that decomposition of monomer molecules enhanced with increasing input power and decreasing total pressure. The main radicals are of m/z =147 in plasma phase corresponding for SiOx film growth.  
        关键词：SiOx;in situ diagnosis;Mass spectrometry   
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        发布时间：2021-03-12
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