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EFFECT OF Cu-Ni CONTENT ON THE CORROSION RESISTANCE OF(Cu-Ni)/(10NiO-90NiFe_2O_4)CERMET INERT ANODE FOR ALUMINUM ELECTROLySIS

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Acta Metallurgica Sinica(English Letters) 2008年第1期21卷 72-78页

作者： Z.L. tian y.Q. Lai J. Li y.X. Liu School of Metallurgical Science and Engineering Central South University Changsha 410083 China

（Cu-Ni）/（10NiO-90NiFe204） cermet inert anodes containing metal Cu-Ni0, 5, 10, 15 and 20 wt pct were prepared and their corrosion resistance to Na3AlF6-Al2O3 melts was investigated. The results indicate that the content of metal Cu-Ni has little effect on the steady-state concentration of Ni in the electrolyte and the values could not be used to effectively differentiate their corrosion resistance. The steady-state concentration of Fe decreases from 304×10^-6 to 168×10^-6 and that of Cu increases from 21×10^-6 to 71×10^-6 with the content of metal Cu-Ni increasing from 0 to 20 wt pct. Post-examination shows that metallic phase Cu-Ni is corroded preferentially during electrolysis and many pores are left at the anode surface. Considering the corrosion resistance and electrical conductivity, the cermet containing metal Cu-Ni 5 wt pct should be selected and studied further.

关键词： Aluminum electrolysis Inert anode NiFe2O4 based cermet Corrosion resistance

Synthesis of Dibenzo-sulfur-heterocycles through Reaction of Diphenyl-type Compounds with Elemental Sulfur over USy Zeolite

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Chinese Chemical Letters 1997年第10期8卷 849-852页

作者： Zuo, BJ Ma, yD tian, y Wang, QL SHANDONG UNIV DEPT CHEMJINAN 250100PEOPLES R CHINA

A series of dibenzo-sulfur-heterocycle compounds, such as phenothiazine, phenoxthine, thianthrene, thioxanthene and derivatives of dibenzothiophene were synthesized with satisfactory yields through reaction of the cor... 详细信息

关键词： over USy type Synthesis of Dibenzo-sulfur-heterocycles through Reaction of Diphenyl-type Compounds with Elemental Sulfur over USy Zeolite

AN IMPROVED SyNTHESIS OF NIMBIDIOL

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Chinese Chemical Letters 1995年第8期6卷 657-660页

作者： Zhou, R Wang, XF tian, y Pan, XF Lanzhou Univ Natl Lab Appl Organ Chem Lanzhou 730000 Peoples R China Acad Sinica Kunming Inst Bot Lab Phytochem Kunming 650204 Peoples R China

Nimbidlol 1 and epi-6-oxonimbidiol 2 have been efficiently and stereospecifically synthesized from 3-isopropoxy-5,5-dimethyl-2-cyclohexenone and iodide 3 which are readily available.

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The Recursive Formulation of Particular Solutions for Some Elliptic PDEs with Polynomial Source Functions

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Communications in Computational Physics 2009年第5期5卷 942-958页

作者： J.Ding H.y.tian C.S.Chen Department of Mathematics University of Southern MississippiHattiesburgMS 39406USA

In this paper we develop an efficient meshless method for solving inhomogeneous elliptic partial differential *** first approximate the source function by Chebyshev *** then focus on how to find a polynomial particular solution when the source function is a *** the principle of the method of undetermined coefficients and a proper arrangement of the terms for the polynomial particular solution to be determined,the coefficients of the particular solution satisfy a triangular system of linear algebraic *** recursive formulas for the coefficients of the particular solutions are derived for different types of elliptic *** method is further incorporated into the method of fundamental solutions for solving inhomogeneous elliptic *** results show that our approach is efficient and accurate.

关键词： The method of fundamental solutions particular solution Helmholtz equation Chebyshev polynomial Laplace-Helmholtz equation convection-reaction equation

Rotational and translational domains of beta precipitate in aged binary Mg-Ce alloys

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Journal of Magnesium and Alloys 2021年第3期9卷 1039-1056页

作者： B.Z.Sun H.X.Zhang y.Dong J.X.Ren y.tian G.M.Xie J.Tan y.H.Sun Na Xiao School of Materials Science and Engineering Northeastern UniversityShenyang 110819China State Key Lab Rolling&Automat Northeastern UniversityShenyang 110819China Key Laboratory for Anisotropy and Texture of Materials Ministry of EducationNortheastern UniversityShenyang 110819China Analytical and Testing Center Northeastern UniversityShenyang 110819China

The structural evolution fromβ_(1)(Mg_(3)Ce)toβ(Mg_(12)Ce)precipitates,which takes place at the over-aged stage of binary Mg-Ce alloys,are investigated by high-angle annular dark-field scanning transmission electron *** structural transformation mainly occurs in the{111}_(β1)crystallographic planes,where the newly formedβlattices exhibit two categories of domain structures,namely rotational and translational *** rotational domain is composed of threeβdomains(β_(RA),β_(RB)andβ_(RC)),which are related by a 120°rotation with respect to each other around the 111_(β1)axis of theirβ_(1)parent ***{111}_(β1)crystallographic planes can provide four sets of sublattices with the same orientation for an initial nucleation ofβ*** leads to the formation of four translationalβdomains(β_(TA),β_(TB),β_(TC)andβ_(TD)),among which any two differ by a vector of 1/6112_(β1).We deduce theoretically that there exist twenty-fourβdomains during this ***,considering the interfacial misfit,only one-third of domains can grow up and eventually formsβ***,a majority ofβribbons overlap partiallyβ_(1)plate,which is beneficial to relax interfacial strain amongβ,β_(1)andα-Mg matrix(α/β/β_(1)).The configuration of multipleβdomains can effectively regulate interfacial misfit ofα/βandβ/β_(1),which are responsible for enhancing the hardness and strength of Mg-Ce ***,this study aims to provide some clues to improve the over-aged performance of magnesium alloys by constructingβdomains and optimizing theα/β/β_(1)interface.

关键词： Magnesium alloys HAADF-STEM Rotational domain Translational domain Phase transition Interfacial misfit

An insight into a novel Mg2InSm prismatic plate in Mg-In-Sm alloy

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Journal of Materials Science & Technology 2022年第30期125卷 222-230页

作者： J.Wang X.L.Lu y.tian Q.y.Huang H.B.Xie B.Z.Sun L.R.Liu School of Materials Science and Engineering Northeastern UniversityShenyang 110819China Key Laboratory for Anisotropy and Texture of Materials Ministry of EducationNortheastern UniversityShenyang 110819China School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China

Prismatic precipitate platelet is always purposefully designed in the microstructure of magnesium alloys due to its greater contribution to yield *** this study,with an introduction of In into Mg-Sm system,a category of novel{1010}_(α) prismatic platelets has replaced thoroughly the traditionalβ’precipitate formed in magnesium rare earth(Mg-RE)***,the microstructural characteristics of platelet are investigated particularly by atomic scale scanning transmission electron *** is confirmed that the platelet has a Mg_(2) InSm composition and can maintain a coherent relationship with α-Mg ***,on account of the similarities between In and Mg atoms,the Mg_(2) InSm prismatic platelet could be structurally categorized as a generalizedβ"precipitate with a(Mg_(2) In)Sm-type DO_(19) structure when both In and Mg are regarded as an equivalent ***,the addition of In into Mg-Sm alloy induces the formation ofβ"***,the formedβ"prismatic platelets generally have a large average aspect *** findings are of great significance to construct the effective precipitation strengthening phases and optimize the microstructure of Mg-based alloys.

关键词： Microstructure Scanning transmission electron microscopy Magnesium alloys Prismatic platelet Generalizedβ"precipitate

INFLUENCES OF CASTING SPEED AND SEN DEPTH ON FLUID FLOW IN THE FUNNEL TyPE MOLD OF A THIN SLAB CASTER

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Acta Metallurgica Sinica(English Letters) 2007年第1期20卷 15-26页

作者： B.W. Li X.y. tian E.G. Wang J.C. He Key Laboratory of National Education Ministry for Electromagnetic Processing of Materials Northeastern University Shenyang 110004 China

In recent years, thin slab continuous casting technology has been widely used to improve the quality of the product and to reduce the cost. One of the challenges faced by this technology is to design reasonable flow patterns, which strongly affect the surface and inner properties of the final slab in the mold. With the fixed scales and complex geometrical structures of nozzle and funnel type mold, a series of numerical simulations are made to analyze the flow patterns in melt steel using finite volume method based on structured body fitted coordinate grids. The CFD （computational fluid dynamics） package is validated first using one typical case described in previously published studies, and then it is developed to study the effect of operational parameters on fluid flow in thin slab caster. Two operational parameters, casting speed and SEN （submerged entry nozzle） depth, are mainly considered for numerical analysis. On the basis of present simulations, the reasonable SEN submergence depths corresponding to different casting speeds are suggested according to fluid flow characteristics like, flow jet impingement on the narrow side of the mold, flow speed of the melt steel beneath the meniscus and the recirculation region. This is the first stage of study on the numerical analysis of the whole thin slab casting process with electromagnetic brake.

关键词： continuous casting thin slab submerged entry nozzle (SEN) numerical analysis funnel type mold standard k-ε model RNG (renormalization group) k-ε model

KINETIC STUDy OF SPINEL LiMn_2O_4 SyNTHESIZED By SOLID REACTION WITH SOFT-CHEMICAL METHOD

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Acta Metallurgica Sinica(English Letters) 2005年第4期18卷 512-518页

作者： C.Q. Xu y. W. tian y. C. Zhai Z.J. Guo Z. Q. Huang School of Materials and Metallurgy Northeastern University Shenyang 110004 China

The differential thermal analysis （DTA） curves were measured at different heating rates in flowing air for studying the synthesis of the spinel LiMn2O3 with Li2CO3 and MnO2, The reaction began at about 503K, and finished at about 873K. The apparent activation energy of Kissinger method was about ***^-1, the reaction orderwas 1.67, the frequency factor was 7.81×10^9, and therefore the dinetic epuation was dδ/dt=A·exp（- E/RT）·（1-δ）^n=7.81×10^9, exp（-122770/RT）·（l-δ）^1.67 . Coats-Redfem integral method was used to analyze the DTA curves of the samples at different heating rates, and the calculated apparent activation energy and frequency factor were 112. 13kJ· mol^-1 and 1.18 × 10^9, respectively, rather close to that of Kissinger method. X-ray diffraction （XRD） and scanning electron microscope （SEM） results shown that the synthesized LiMn2O3 possesses pure phase, regular shape and normal particle distribution.

关键词： lithium manganese oxides synthesized kinetics Kissinger method,Coats-Redfern integral method

EFFECT OF Ar PRESSURE ON STRUCTURAL AND ELECTRICAL PROPERTIES OF Cu FILMS DEPOSITED ON GLASS By DC MAGNETRON SPUTTERING

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Acta Metallurgica Sinica(English Letters) 2002年第1期15卷 39-44页

作者： P. Wu F.P. Wang L.Q. Pan y. tian H. Qiu Department of Physics University of Science and Technology Beijing Beijing 100083China Beijing Keda-tianyu Microelectronic Material Technology Development Co. Ltd. Beijing 100083 China

Cu films with thickness of 630-1300nm were deposited on glass substrates without heating by DC magnetron sputtering in pure Ar gas. Ar pressure was controlled to 0.5, 1.0 and 1.5Pa respectively. The target voltage was fixed at 500V but the target current increased from 200 to 1150mA with Ar pressure increasing. X-ray diffraction, scanning electron microscopy and atomic force microscopy were used to observe the structural characterization of the films. The resistivity of the films was measured using four-point probe technique. At all the Ar pressures, the Cu films have mixture crystalline orientations of [111], [200] and [220] in the direction of the film growth. The film deposited at lower pressure shows more [111] orientation while that deposited at higher pressure has more [220] orientation. The amount of larger grains in the film prepared at 0.5Pa Ar pressure is slightly less than that prepared at 1.0Pa and 1.5Pa Ar pressures. The resistivities of the films prepared at three different Ar pressures represent few differences, about 3-4 times of that of bulk material. Besides the deposition rate increases with Ar pressure because of the increase in target current. The contribution of the bombardment of energetic reflected Argon atoms to these phenomena is discussed.

关键词： Cu film DC magnetron sputtering deposition Ar pressure structure reststivity