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| 1 | A Simulator for Producing of High Flux Atomic Oxygen Beam by Using ECR Plasma Source显示文摘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 beam 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 beam. The properties of plasma density, electron temperature, plasma space potential and ion incident energy were characterized. The atomic oxygen beam flux was calibrated by measuring the mass loss rate of Kapton during the atomic 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. | Shuwang DUO, Meishuan LI and Yaming ZHANGShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China | 2004 | Journal of Materials Science & Technology2004，20，6： | 7 |
| 2 | Synthesis,Microstructure,and Property of Cr_2AlC显示文摘Cr_2AlC is an unusual layered ternary ceramic that combines the merits of both metals and ceramics.The salient properties of Cr_2AlC are strongly related to its bonding characteristics and microstructures.Synthesis, microstructure,and property of Cr_2AlC are reviewed in this paper.First,theoretical calculations and physical properties are introduced.Then,the processing of Cr_2AlC ceramic in both bulk form and thin films and their basic mechanical properties are summarized.Atomic-scale characterizations of Cr_2AlC,as well as the microstructural relationships among Cr_2AlC,Al_8Cr_5,and AlCr_2 were achieved using a series of transmission electron microscopy(TEM)techniques.Moreover,high-temperature oxidation and hot corrosion behaviors of Cr_2AlC were investigated by means of thermogravimetric analysis,X-ray diffraction,Raman spectroscopy, scanning electron microscopy,and TEM.Mechanism of the excellent high-temperature corrosion resistance of Cr_2AlC is discussed based on systematic microstructural analyses.Finally,concise conclusions are drawn. | Zhijun LIN Yanchun ZHOU Meishuan LI | 2007 | Journal of Materials Science & Technology2007，23，6： | 5 |
| 3 | Deposition of Phase-pure Cr2AlC Coating by DC Magnetron Sputtering and Post Annealing Using Cr-Al-C Targets with Controlled Elemental Composition but Different Phase Compositions显示文摘Polycrystalline Cr_2AlC coatings were prepared on M38G superalloy using a two-step method consisting of magnetron sputtering from Cr-Al-C composite targets at room temperature and subsequent annealing at 620°C. Particularly, various targets synthesized by hot pressing mixture of Cr, Al, and C powders at 650–1000°C were used. It was found that regardless of the phase compositions and density of the composite targets, when the molar ratio of Cr:Al:C in the starting materials was 2:1:1, phase-pure crystalline Cr_2AlC coatings were prepared by magnetron sputtering and post crystallization. The Cr_2AlC coatings were dense and crack-free and had a duplex structure. The adhesion strength of the coating deposited on M38G superalloy from the 800°C hot-pressed target and then annealed at 620°C for 20 h in Ar exceeded82 ± 6 MPa, while its hardness was 12 ± 3 GPa. | Yueming Li Guorui Zhao Yuhai Qian Jingjun xu Meishuan Li | 2018 | Journal of Materials Science & Technology2018，34，3： | 3 |
| 4 | Effects of High Temperature Oxidation on Mechanical Properties of Ti_3AlC_2显示文摘The oxidation tests of Ti_3AlC_2 were conducted at 1100 and 1200?C in air for 48 and 360 h, respectively,and the effects of high temperature oxidation on the flexural strength and hardness of Ti_3AlC_2 were investigated. The microstructure, grain size and phase compositions of Ti_3AlC_2 substrate didn't change after oxidation, hence the oxide removed Ti_3AlC_2 substrate maintained its initial flexural strength and hardness. However, the flexural strength of oxide retained Ti_3AlC_2 decreased by about 5%. Acoustic emission monitoring indicated that during the process of three-point bending test, the formed Al_2O_3 scale on Ti_3AlC_2 surface fractured firstly in a cleavage manner, then the substrate/oxide interface cracked,and finally the Ti_3AlC_2 substrate fractured. The mechanical degradation was caused by the preferential formation of cracks in brittle Al_2O_3 scale as well as at defective and lacunose grain boundaries of the substrate where stress concentration generated. The mechanical degradation was insensitive to oxidation temperature and time in the present conditions. In addition, the surface hardness increased significantly after oxidation due to the formed hard Al_2O_3 scale on the surface of Ti_3AlC_2 substrate. | Xichao Li Lili Zheng Yuhai Qian Jingjun Xu Meishuan Li | 2017 | Journal of Materials Science & Technology2017，33，6： | 2 |
| 5 | TEM Investigations on Layered Ternary Ceramics显示文摘Layered ternary ceramics represent a new class of solids that combine the merits of both metals and ceramics. These unique properties are strongly related to their layered crystal structures and microstructures. The combination of atomic-resolution Z-contrast scanning transmission electron microscopy (STEM) and transmission electron microscopy (TEM), selected area electron diffraction (SAED), convergent beam electron diffraction (CBED) represents a powerful method to link microstructures of materials to macroscopic properties, allowing layered ternary ceramics to be investigated in an unprecedented detail. Microstructural information obtained using TEM is useful in understanding the formation mechanism, layered stacking characteristics, and defect structures for layered ternary ceramics down to atomic-scale level; and thus provides insight into understanding the 'Processing-Structure-Property' relationship of layered ternary ceramics. Transmission electron microscopic characterizations of layered ternary ceramics in Ti-Si-C, Ti-Al-C, Cr-Al-C, Zr-Al-C, Ta-Al-C and Ti-Al-N systems are reviewed. | Zhijun LIN Meishuan LI Yanchun ZHOU | 2007 | Journal of Materials Science & Technology2007，23，2： | 2 |
| 6 | Improvement on the Oxidation Resistance of a Ti_3Al Based Alloy by Cr1-xAl_xN (0≤x≤0.47) Coatings显示文摘Cr_( 1-x ) Al_xN 涂层在由在 800-900 °C 的等温的氧化测试的 reactivesputtering method.The 结果的基于的合金显示出的 Ti3AI 上被扔了thatCr_( 1-x ) Al_xN 涂层能显著地在 coatings.No 的表面上由于 Al2O3+Cr2O3 混合氧化物规模的 theformation 减少合金的氧化率 thecoatings 或氧化物规模的分裂在 800 °C .Ti 发生在周期的氧化期间被观察到 diffuseinto 涂层。 | Ming ZHU Meishuan LI Shuwang DUO Yanchun ZHOU | 2007 | Journal of Materials Science & Technology2007，23，3： | 2 |
| 7 | Porous Y_2SiO_5 Ceramic with Low Thermal Conductivity显示文摘Porous Y2SiO5 ceramic was fabricated by freeze casting with tert-butyl alcohol as solvent. The porous Y2SiO5 ceramic possessed long straight pore structure. With decreasing solid loading from 20 to 10 vol.%, the porosity of the Y2SiO5 ceramic increased linearly from 45% to 72%, while the compressive strength declined from 23.2 to 3.1MPa. The thermal conductivity of Y2SiO5 decreased from 1.34W/mK for the dense bulk to 0.05 W/mK for the porous body with a porosity of 57%. | Duanyang Li Meishuan Li | 2012 | Journal of Materials Science & Technology2012，28，9： | 2 |
| 8 | Microstructure and mechanical properties of short-carbon-fiber/Ti_(3)SiC_(2) composites显示文摘Short-carbon-fibers(C_(sf))reinforced Ti_(3)SiC_(2) matrix composites(C_(sf)/Ti_(3)SiC_(2),the C_(sf) content was 0 vol%,2 vol%,5 vol%,and 10 vol%)were fabricated by spark plasma sintering(SPS)using Ti_(3)SiC_(2) powders and C_(sf) as starting materials at 1300℃.The effects of C_(sf) addition on the phase compositions,microstructures,and mechanical properties(including hardness,flexural strength(σ_(f)),and KIC)of C_(sf)/Ti_(3)SiC_(2) composites were investigated.The C_(sf),with bi-layered transition layers,i.e.,T_(IC) and SiC layers,were homogeneously distributed in the as-prepared C_(sf)/Ti_(3)SiC_(2) composites.With the increase of C_(sf) content,the K_(IC) of C_(sf)/Ti_(3)SiC_(2) composites increased,but the σ_(f) decreased,and the Vickers hardness decreased initially and then increased steadily when the C_(sf) content was higher than 2 vol%.These changed performances(hardness,σ_(f),and K_(IC))could be attributed to the introduction of C_(sf) and the formation of stronger interfacial phases. | Guangqi HE Rongxiu GUO Meishuan LI Yang YANG Linshan WANG Yuhai QIAN Jun ZUO Jingjun XU Changsheng LIU | 2020 | Journal of Advanced Ceramics2020，9，6： | 2 |
| 9 | Effect of ion im- plantation upon erosion resistance of polyimide films in space environment显示文摘 | Duo Shuwang Li Meishuan Zhou Yanchun | 2006 | Transactions of Nonferrous Metals Society of China2006，，16： | 1 |
| 10 | Influence of pre-oxidation on the hot corrosion of Ti3SiC2 in the mixture of Na2SO4-NaCl melts显示文摘 | LIU Guangming LI Meishuan ZHOU Yanchun | 2006 | Corrosion Science2006，48，： | 1 |
| 11 | Hot corrosion behavior of Ti3SiC2 in the mixture of Na2SO4-NaCl melts显示文摘 | LIU Guangming LI Meishuan ZHOU Yanchun | 2005 | Journal of the European Ceramic Society2005，25，： | 1 |
| 12 | Corrosion behavior and strength degradation of Ti3SiC2 exposed to a eutectic K2CO3 and Li2CO3 mixture显示文摘 | LIU Guangming LI Meishuan ZHOU Yanchun | 2003 | Journal of the European Ceramic Society2003，23，： | 1 |
| 13 | Oxidation Behaviors of C-ZrB_2-SiC Composite at 2100℃ in Air and O_2显示文摘The oxidation behaviors of graphite and ZrB_2-SiC modified graphite composite were investigated at 2100℃ in1X105 Pa air and 0.2X105 Pa O2. The oxidation tests were conducted in an induction heating furnace. The oxidation of these two materials followed the linear rate law. The determined radius loss rates of graphite and C-ZrB_2-Si C at 2100℃ were 2.18X10-2and 1.05X10-2%/s in 1X105 Pa air, and 3.23X10 2 and 2.21X10 2%/s in 0.2X105 Pa O2, respectively. The incorporation of ZrB2 and SiC decreased remarkably the oxidation rate of graphite because the oxide scale formed on the sample surface during oxidation helps in reducing the exposed surface area of the underneath substrate. In two different atmospheres with the same oxygen partial pressure, both graphite and ZrB_2-SiC experienced more severe oxidation at 2100℃ in0.2X105 Pa O2than in 1X105 Pa air. The oxidation rate-controlling step for graphite and ZrB_2-SiC was proposed to be the inward diffusion of oxygen through the boundary layer and through the pores in the oxide scale, respectively. A model based on diffusion theory was established to discuss the effect of the total gas pressure on their oxidation behaviors. | Zhongwei Zhang Cewen Nan Jingjun Xu Zenghua Gao Meishuan Li Junshan Wang | 2014 | Journal of Materials Science & Technology2014，30，12： | 1 |
| 14 | High temperature corrosion behavior of a multilayer CrAlN coating prepared by magnetron sputtering method on a K38G alloy显示文摘 | Li Tianpeng Zhou Yanchun Li Meishuan | 2008 | Surf Coat Techn2008，202，： | 1 |
| 15 | Oxidation behaviour of Ti3SiC2-based ceramic at 900-1300℃ in air显示文摘 | Zhimei Sun Yanchun Zhou Meishuan Li | 2001 | Corrosion Science2001，43，： | 1 |
| 16 | A polysilazane coating protecting polyimide from atomic oxygen and vacuumultraviolet radiation erosion显示文摘 | LONGFEI HU MEISHUAN LI CAIHONG XU | 2009 | Surface&Coatings Technology2009，203，： | 1 |
| 17 | Influence of pre-oxidation on the hot corrosion of Ti 3 SiC 2 in the mixture of Na 2 SO 4 –NaCl melts显示文摘 | Guangming Liu Meishuan Li Yanchun Zhou Yaming Zhang | 2005 | Corrosion Science2005，，3： | 1 |
| 18 | Influence of Yttrium Implantation on Oxidation Behavior of Co-40Cr Alloy显示文摘 | Jin Huiming Li Tiefan Li Meishuan | 1999 | Journal of Rare Earths1999，17，1： | 1 |
| 19 | Synthesis and microstructure of layered-ternary Ti2AlN ceramic 显示文摘 | LIN Zhijun ZHUO Mujin LI Meishuan | 2007 | Scripta Mater2007，56，12： | 1 |
| 20 | A polysilazane coating protecting polyimide from atomic oxygen and vacuum ultraviolet radiation erosion显示文摘 | Hu Longfei Li Meishuan Xu Caihong | 2009 | Surface & Coatings Technology2009，203，： | 1 |
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