检索结果-南通市图书馆

添加0.3%Sc对Al-Ca-Si共晶合金显微组织、相组成及硬化性能的影响（英文）

在线全文

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2017年第4期27卷 741-746页

作者： Nikolay belov Evgenia NAUMOVA Torgom AKOPYAN National University of Science and Technology MISIS 4 Leninskiy pr. 4 Moscow 119049 Russia institute of Russian Academy of Sciences A. A. Baikov Institute of Metallurgy and Material Science RASLeninskiy pr. 49 Moscow 119991 Russia

研究含0.3%Sc、0-14%Si和0-10%Ca铝基合金的相组成、显微组织和硬化性能。采用实验研究包括扫描电镜、热分析和硬度测试与Thermo-Calc软件模拟相结合的方法对合金的组成进行优化。结果表明,经300~500°C退火处理后合金的硬化效果最好,... 详细信息

研究含0.3%Sc、0-14%Si和0-10%Ca铝基合金的相组成、显微组织和硬化性能。采用实验研究包括扫描电镜、热分析和硬度测试与Thermo-Calc软件模拟相结合的方法对合金的组成进行优化。结果表明,经300~500°C退火处理后合金的硬化效果最好,这是由于Al3Sc纳米颗粒的析出及其进一步粗化。成分在(Al)+Al_4Ca+Al_2Si_2Ca相区的合金呈现明显的硬化效应。三元共晶合金(Al)+Al_4Ca+Al_2Si_2Ca比Al-Si共晶合金的显微组织细得多,这表明实验合金相对于A356系列工业合金具有更高的力学性能。与A356系列合金不同,实验合金不需要淬火处理,因为在其铸件的退火过程中形成了硬化粒子。

关键词： Al-Ca-Si-Sc 系列合金共晶 Al3Sc 纳米颗粒相组成显微组织热处理硬化

在有限域上构造MDS矩阵的一些方法（英文）

在线全文

学校读者我要写书评

暂无评论

应用数学与计算数学学报 2017年第2期31卷 143-152页

作者： belov A V LOS A B ROZHKOV M i 高等经济大学俄罗斯莫斯科101000

研究在有限域上构造MDS方阵的一些方法,这类矩阵作为扩散映射用于构建块加密算法和检验函数.给出了若干类4阶循环MDS矩阵以及具有最多单位元的4阶MDS矩阵.

关键词： MDS矩阵 MDS编码数据保护算法

influence of Zr and Mn additions on microstructure and properties of Mg-2.5wt%Cu-Xwt%Zn(X=2.5,5 and 6.5)alloys

在线全文

学校读者我要写书评

暂无评论

international Journal of Minerals,Metallurgy and Materials 2022年第9期29卷 1733-1745页

作者： A.V.Koltygin V.E.Bazhenov i.V.Plisetskaya V.A.Bautin A.i.Bazlov N.Y.Tabachkova O.O.Voropaeva A.A.Komissarov V.D.belov Foundry Department National University of Science and Technology(MISiS)Moscow 119049Russia Department of Metallurgy Steel New Production Technologies and Protection of MetalsNational University of Science and Technology(MISiS)Moscow 119049Russia Laboratory of Advanced Green Materials National University of Science and Technology(MISiS)Moscow 119049Russia Department of Materials Science of Semiconductors and Dielectrics National University of Science and Technology(MISiS)Moscow 119049Russia Fianit Laboratory(Laser Materials and Technology Research Center at GPi) Prokhorov General Physics Institute RASMoscow 119991Russia Laboratory of Hybrid Nanostructured Materials National University of Science and Technology(MISiS)Moscow 119049Russia Laboratory of Medical Bioresorption and Bioresistance Moscow State University of Medicine and DentistryMoscow 127473Russia

This work studied the effects of adding Zr and Mn in amounts less than 1wt%on the microstructure,mechanical properties,casting properties,and corrosion resistance of Mg-Zn-Cu alloys containing 2.5wt%Cu and 2.5wt%-6.5wt%Zn.The hardness and electrical conductivity measurements were used to find an optimal heat treatment schedule with the best mechanical properties.it has been established that Zr significantly increases the yield strength of the alloys due to a strong grain refinement effect.However,the presence of Mn and Zr has a detrimental effect on alloy’s elongation at fracture.it was shown that the precipitation of the Mg_(2)Cu cathodic phase in the alloy structure negatively affects the corrosion behavior.Nevertheless,the addition of Mn decreases the corrosion rate of the investigated alloys.The best combination of the mechanical,casting,and corrosion properties were achieved in the alloys containing 2.5wt%Cu and 5wt%Zn.However,the Mn or Zr addition can improve the properties of the alloys;for example,the addition of Mn or Zr increases the fluidity of the alloys.

关键词： magnesium alloy Mg-Zn-Cu casting alloy Mn addition Zr addition

New superhydrophobic composite coatings on Mg-Mn-Ce magnesium alloy

在线全文

学校读者我要写书评

暂无评论

Journal of Magnesium and Alloys 2023年第5期11卷 1721-1739页

作者： K.V.Nadaraia S.N.Suchkov i.M.imshinetskiy D.V.Mashtalyar D.Yu.Kosianov E.A.belov S.L.Sinebryukhov S.V.Gnedenkov institute of Chemistry Far Eastern BranchRussian Academy of SciencesVladivostok690022Russia Far Eastern Federal University Vladivostok690922Russia

A novel combined method for the formation of composite coatings on the Mg-Mn-Ce alloy is developed.Ceramic like matrix was formed on the Mg alloy surface by the plasma electrolytic oxidation.Then the samples were subsequently processed by dip-coating in an alcohol suspension of superdispersed polytetrafluoroethylene and spraying with the tetrafluoroethylene telomers solution.SEM,OSP,and SPM was used to study structure of formed surfaces.it was established by measurements of CA and CAH,as well as surface free energy calculations that formed coatings demonstrate superhydrophobic properties due to the presence of an irregular hierarchical surface structure and low surface free energy of fluoropolymers.The coating preserves its hydrophobic properties after exposure to high and low temperatures,for a long time as well as being in corrosive environments.EDS and XRD data analysis confirmed the presence of organofluorine compounds in the composite layers,including in the form of crystalline polytetrafluoroethylene.Using potentiodynamic polarization test and EiS,it was found that the resulting coatings significantly increase the corrosion resistance of Mg material.These data are also confirmed by salt spray tests for 40 days.incorporation of fluoropolymers additionally decrease coatings coefficient of friction.

关键词： Magnesium alloy Plasma electrolytic oxidation Superhydrophobicity Fluoropolymers Composite coatings

Control of combustion area using electrical resistivity method for underground coal gasification

在线全文

学校读者我要写书评

暂无评论

international Journal of Mining Science and Technology 2012年第3期22卷 351-355页

作者： Selivanova Tatiana Grebenyuk igor belov Alexey Engineering School Far Eastern Federal University Vladivostok Russian Federation

Underground coal gasification (UCG) is one of the clean technologies to collect heat energy and gases (hydrogen, methane, etc.) in an underground coal seam. it is necessary to further developing environ-mentally friendly UCG system construction. One of the most important UCG's problems is underground control of combustion area for efficient gas production, estimation of subsidence and gas leakage to the surface. For this objective, laboratory experiments were conducted according to the UCG model to identify the process of combustion cavity development by monitoring the electrical resistivity activity on the coal samples to setup fundamental data for the technology engineering to evaluate combustion area. While burning coal specimens, that had been sampled from various coal deposits, electrical resistivity was monitored. Symmetric four electrodes system (ABMN) of direct and low-frequency current electric resistance method was used for laboratory resistivity measurement of rock samples. Made research and the results suggest that front-end of electro conductivity activity during heating and combusting of coal specimen depended on heating temperature. Combusting coal electro conductivity has complicated multistage type of change. Electrical resistivity method is expected to be a useful geophysical tool to for evaluation of combustion volume and its migration in the coal seam.

关键词：煤炭地下气化燃烧区域电阻率法控制实验室实验气体生产加热温度电传导性

Photovoltaic and photoelectric response of Sn_(2)P_(2)S_(6) ferroelectric films

在线全文

学校读者我要写书评

暂无评论

Journal of Advanced Dielectrics 2019年第1期9卷 22-26页

作者： A.V.Solnyshkin i.L.Kislovay A.N.belov V.i.Shevyakov D.A.Kiselev i.P.Raevski D.N.Sandjiev S.i.Raevskaya ational Research University of Electronic Technology Zelenograd Moscow 124498Russia Department of Condensed Matter Physics Tver State University Tver 170100Russia National University of Science and Technology“MiSiS” Moscow 119049Russia Research institute of Physics Southern Federal University Rostov-on-DonRussia

in the present work,the comparative study of the electric response of Sn_(2)P_(2)S_(6) films to the visible light action was carried out without and under external electric field.The light flux modulated by a chopper induces the integral response comprising time-dependent photoelectric and photovoltaic components.it was shown that spontaneous polarization influences the electric response characteristics.

关键词： Photovoltaic response photoelectric properties ferroelectric film

Dielectric properties of composite based on ferroelectric copolymer of poly(vinylidene fluoride-trifluoroethylene)and ferroelectric ceramics of barium lead zirconate titanate

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Advanced Dielectrics 2017年第5期7卷 1-5页

作者： A.V.Solnyshkin i.L.Kislova i.M.Morsakov A.N.belov V.i.Shevyakov D.A.Kiselev V.V.Shvartsman National Research University of Electronic Technology Zelenograd 124498 MoscowRussia Department of Condensed Matter Physics Tver State University Tver 170100Russia National University of Science and Technology"MiSiS"119049 Moscow Russia institute for Materials Science University of Duisburg-Essen Essen D 45141Germany

A study of dielectric properties of composite films on the base of poly(vinylidene fluoride-trifluoroethylene)copolymer P(VDFTrFE)and ferroelectric ceramics of barium lead zirconate titanate(BPZT)solid solution is presented in this work.The composite films containing up to 50 vol.%of BPZT grains with size1m were prepared by the solvent cast method.Frequency dependences of real and imaginary components of the complex permittivity were determined.The concentration dependence of the dielectric constant was discussed.

关键词： Dielectric response ferroelectric polymer composite film

Electrical characterization of poly(vinylidene fluoride-trifluoroethylene) nanocrystals embedded in porous alumina matrix

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Advanced Dielectrics 2018年第1期8卷 1-5页

作者： A.N.belov i.L.Kislova D.V.Loktev E.N.Redichev Stroganov A.V.Solnyshkin National Research University of Electronic Technology Zelenograd 124498 MoscowRussia Department of Condensed Matter Physics Tver State University Tver 170100Russia Microdatchik Ltd. Zelenograd 124498MoscowRussia

in this work,the study of dielectric properties of composite structures on the base of poly(vinylidene fluoride-triflouroethylene)copolymer P(VDF-TrFE)and porous aluminum oxide layers produced by the melt-impregnation is presented.Frequency dependences of dielectric characteristics of the composite samples were determined.The dielectric dispersion and ferroelectric switching processes in the composite structures were discussed.

关键词： Porous anodic alumina ferroelectric polymer composite film

含LPSO相和W相Mg−Zn−Y−Zr合金铸造、力学和腐蚀性能的比较

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2021年第5期31卷 1276-1290页

作者： V.E.BAZHENOV S.S.SAiDOV Yu.V.TSELOVALNiK O.O.VOROPAEVA i.V.PLiSETSKAYA A.A.TOKAR A.i.BAZLOV V.A.BAUTiN A.A.KOMiSSAROV A.V.KOLTYGiN V.D.belov National University of Science and Technology(MiSiS) Leninskiy pr.4Moscow119049Russia

为了开发新型铸造镁合金,研究含长周期堆垛相(LPSO)和W共晶相的Mg−Zn−Y−Zr合金。硬度和电导率测试结果表明,T6热处理的温度是合适的。与含W相的合金相比,含LPSO相合金的热裂敏感性更低,这与合金的凝固区间有关。然而,两者具有相同的流... 详细信息

为了开发新型铸造镁合金,研究含长周期堆垛相(LPSO)和W共晶相的Mg−Zn−Y−Zr合金。硬度和电导率测试结果表明,T6热处理的温度是合适的。与含W相的合金相比,含LPSO相合金的热裂敏感性更低,这与合金的凝固区间有关。然而,两者具有相同的流动性。在T6条件下,增加Y含量可以提高合金的屈服强度,但合金的其他拉伸性能基本相同。与含W相的合金相比,含LPSO相的合金具有更优的耐腐蚀性。含LPSO相的Mg−2.5Zn−3.7Y−0.3Zr(质量分数,%)合金具有良好的铸造性能和力学性能,其腐蚀速率为2 mm/year。

关键词：镁合金铸造 LPSO相 W相流动性热裂敏感性腐蚀速率