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Phase transformation and reduction kinetics during the hydrogen reduction of ilmenite concentrate

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International Journal of Minerals,Metallurgy and Materials 2012年第5期19卷 384-390页

作者： Xin-guo Si Xiong-gang Lu Chuan-wei li chong-he li Wei-zhong Ding Shanghai Key Laboratory of Modern Metallurgy and Materials Processing Shanghai University Shanghai 200072 China hebei Iron and Steel Group Tangshan Steel Company Tangshan 063020 China

The reduction of ilmenite concentrate by hydrogen gas was investigated in the temperature range of 500 to 1200℃. The microstructure and phase transition of the reduction products were studied by X-ray diffraction （XRD）, scanning electron microscopy （SEM）, and optical microscopy （OM）. It was found that the weight loss and iron metallization rate increased with the increase of reduction temperature and reaction time. The iron metallization rate could reach 87.5% when the sample was reduced at 1150℃ for 80 min. The final phase constituents mainly consist of Fe, M305 solid solution phase （M=Mg, Ti, and Fe）, and few titanium oxide. Microstructure analysis shows that the surfaces of the reduction products have many holes and cracks and the reactions take place from the exterior of the grain to its interior. The kinetics of reduction indicates that the rate-controlling step is diffusion process control with the activation energy of 89 ***1-1.

关键词： ilmenite phase transformations kinetics hydrogen reduction metallization

Effect of controlled rolling/controlled cooling parameters on microstructure and mechanical properties of the novel pipeline steel

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Advances in Manufacturing 2014年第3期2卷 265-274页

作者： Min Jiang li-Na Chen Jin he Guang-Yao Chen chong-he li Xiong-Gang Lu Shanghai Key Laboratory of Modern Metallurgy & Materials Processing Shanghai University Baoshan Iron & Steel Co. Ltd. Shanghai Special Casting Engineering Technology Research Center

The study of controlled rolling/controlled cooling process parameters which affect the microstructure and mechanical properties of a novel pipeline steel has been optimized by the orthogonal experiment with four factors and three levels in this paper. However, the parameters of thermo-mechanical control process （TMCP） optimized by the Gleeble-3500 hot simulator could not satisfy performance requirements of the X100 pipeline steel. In order to improve the performance of this steel, the influence of finish cooling temperature （FCT） on the microstructure and property is studied in detail. It is found that, as this steel is thermo-mechanically treated by this set of parameters （the start heating temperature, finish rolling temperature （FRT）, FCT and cooling rate of 1,180 ℃, 810 ℃, 350 ℃ and 35 ℃/s, respectively）, the micro- structures are mainly composed of granular bainite （GB） and acicular ferrite （AF）. The effective grain sizes are below 20 μm; the steel reaches the optimal balance between the strength and the toughness; the yield strength is 695 MPa; the tensile strength is 768 MPa; the elongation is 16.6 %; the impact energy is 262 J at room temperature. All indexes could meet the requirements of X100 pipeline steel.

关键词： Controlled rolling/controlled cooling Finishcooling temperature (FCT) Microstructure ~ Mechanicalproperties X100 pipeline steel

Interaction mechanism between BaZrO_(3)/Y_(2)O_(3) refractory and Ti_(2)Ni alloy melts

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Journal of Iron and Steel Research International 2024年第6期31卷 1376-1388页

作者： Xiao Hou Guang-yao Chen Jian liu Ming-rui Lv Fei-hai Yu Qi-sheng Feng Rong-bin li Xiong-gang Lu chong-he li State Key Laboratory of Advanced Special Steel and Shanghai Key Laboratory of Advanced Ferromeallurgy and School of Materials Science and Engineering Shanghai UniversityShanghai 200072China Shanghai Special Casting Engineering Technology Research Center Shanghai 201605China Zhejiang Institute of Advanced Materials Shanghai UniversityJiashan 314100ZhejiangChina School of Materials Science and Engineering Shanghai DianJi UniversityShanghai 201306China

The titanium alloys with highly chemical activity require stable crucible refractories that can withstand the erosion of alloy *** phase composition and microstructure are crucial factors that affect the stability of the refractory *** effect of Y_(2)O_(3) on the composition and microstructure of BaZrO_(3) crucible was systematically investigated,and the improved mechanism of the stability of BaZrO_(3)/Y_(2)O_(3) crucible was clarified in comparison with the BaZrO_(3) *** results showed that the erosion layer thickness of the BaZrO_(3)/Y_(2)O_(3) crucible was only 63μm,which was far less than that in the BaZrO_(3) crucible(485μm),and the erosion layer in the BaZrO_(3)/Y_(2)O_(3) crucible also exhibited a higher density than that in the BaZrO_(3) *** the sintering,Y_(2)O_(3) could improve the densification of the BaZrO_(3) crucible due to the solid solution effect between Y_(2)O_(3) and ZrO_(2),which also caused the evaporation of BaO,resulting in the generation of a Y_(2)O_(3)(ZrO_(2))film on the surface of the ***,the Y_(2)O_(3)(ZrO_(2))had higher thermodynamic stability than Y_(2)O_(3),confirming that the BaZrO_(3)/Y_(2)O_(3) crucible with high density exhibited a superior erosion resistance to titanium *** dual-phase structure provides a strategy to design a long-life and stable refractory for melting titanium alloys.

关键词： Barium zirconate Yttrium oxide Dual-phase refractory Titanium alloy Interaction

Calculation of phase equilibria in Al-Fe-Mn ternary system involving three new ternary intermetallic compounds

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Advances in Manufacturing 2018年第2期6卷 247-257页

作者： Lu-Hai Zhou Zhu L Shu-Sen Wang Ren-Min Hu Shi-Hua Wang Zi-Wei Qin Xiong-Gang Lu chong-he li State Key Laboratory of Advanced Special Steel & Shanghai Key Laboratory of Advanced Ferrometallurgy & School of Materials Science and Engineering Shanghai University Shanghai University Shanghai 200072 People's Republic of China Shanghai Special Casting Engineering Technology Research Center Shanghai 201605 People's Republic of China Baosteel Special Steel Co. Ltd. Shanghai 200940 People's Republic of China

In this study, the Al-Fe-Mn ternary system is reassessed by the CALPHAD method. Three new ternary intermetallic compounds are initially described and a rea- sonable and self-consistent set of thermodynamic parameters are established to describe this system. The 973 K, 1 073K, 1 173K, 1 273K, 1 373K, and 1 473K isothermal sections and the 1 073 K, 1 013 K, 968 K and 913 K isothermal sections at the AI corner as well as the liquidus projection at the Al corner are calculated. It is shown that the calculated results are in good agreement with almost all of the experimental results previously reported.

关键词： Al-Fe-Mn - CALPHAD Phase equilibria Isothermal sections

Multiphase reaction spinning of high-temperature resistant weavable SiO_(2)-Kevlar hybrid aerogel fibers

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Nano Research 2025年第1期18卷 424-433页

作者： Yunna Chen Wenlu Zhang Qingyang li Wenbin li chong he School of Textile Science and Engineering Wuhan Textile UniversityWuhan 430200China State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile UniversityWuhan 430200China

Advanced aerogel fibers possess numerousadvantages amalgamating the attributes of aerogels and fibermaterials, rendering them invaluable in the realm of thermalmanagement and regulation. However, the achievement ofrobust mechanical properties and increased temperaturestability is still a major challenge for the majority of aerogelfibers. herein, SiO_(2)-Kevlar hybrid aerogel fibers with bioniccore-shell structure were prepared by reaction spinning andweaved into fabric. Kevlar nanowires dispersion is pumpedinto a bath comprising a self-synthesized silica sol, whichfacilitates the hybridization of biphasic aerogels through thegel reaction. Precise control over the diameter (200-800 μm)and structure of the wet gel fibers was achieved throughmeticulous adjustment of the spinning solution composition and spinning parameters. Subsequent freeze-drying processfacilitates the formation of a core-shell hybrid structure, in which the SiO_(2) aerogel layer effectively encapsulate the Kevlaraerogel core fiber. Taking full advantage of the mechanical properties of the Kevlar core fiber, the resulting SiO_(2)-Kevlaraerogel fibers exhibit commendable weaving characteristics (51.8 MPa). Furthermore, SiO_(2)-Kevlar aerogel fabrics exhibitenhanced thermal insulation characteristics with a thermal conductivity of 0.037 W/(m·K). As a result of the presence ofexternal SiO_(2) aerogel layer, the overall temperature resistance performance of the SiO_(2)-Kevlar fabric reach up to 700 ℃.

关键词： aerogel fibers SiO_(2)aerogel Kevlar aerogel reaction spinning thermal protective performance

Direct oxygen removal from titanium aluminide scraps by yttrium reduction

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Transactions of Nonferrous Metals Society of China 2022年第7期32卷 2428-2437页

作者： li-na JIAO Qi-sheng FENG Shi-yu he Bao-hua DUAN Zhi-he DOU chong-he li Xiong-gang LU State Key Laboratory of Advanced Special Steel&Shanghai Key Laboratory of Advanced Ferrometallurgy&School of Materials Science and Engineering Shanghai UniversityShanghai 200072China School of Metallurgy and Materials Engineering Jiangsu University of Science and TechnologyZhangjiagang 215600China Key Laboratory for Ecological Metallurgy of Multimetallic Mineral Ministry of EducationNortheastern UniversityShenyang 110819China Shanghai Special Casting Engineering Technology Research Center Shanghai 201605China School of Materials Science and Engineering Shanghai Dianji UniversityShanghai 201306China

Titanium aluminum(TiAl)scraps with a high oxygen content were treated with yttrium(Y)in a liquid chemical deoxidization process for *** Gibbs free energy and the equilibrium constant of the deoxidization reaction were calculated,and the effects of the yttrium content and the system pressure on the oxygen content in the product were *** results showed that the oxygen in TiAl scraps could be removed by yttrium,and the oxygen content of the deoxidized TiAl scraps had only 10%of the original content after ***,the oxygen content of the deoxidized TiAl scraps was decreased with the increase of yttrium *** higher the chamber pressure,the greater the oxygen content in the final TiAl *** results were consistent with calculated *** microstructure of the deoxidized alloys was akin to that of the original material;however,Y_(2)O_(3) particles were observed in the deoxidized alloys.

关键词： titanium aluminum scrap yttrium deoxidation recycling

Thermodynamic modeling of ZrO_(2)−CaO−TiO_(2)system

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Transactions of Nonferrous Metals Society of China 2022年第2期32卷 696-708页

作者： Shi-yu he Qi-sheng FENG Bao-hua DUAN Guang-yao CheN Zhu WU chong-he li Xiong-gang LU State Key Laboratory of Advanced Special Steel Shanghai Key Laboratory of Advanced FerrometallurgySchool of Materials Science and EngineeringShanghai UniversityShanghai 200444China Shanghai Special Casting Engineering Technology Research Center Shanghai 201605China Shanghai Institute of Microsystem and Information Technology Chinese Academy of SciencesShanghai 201800China School of Materials Science Shanghai Dianji UniversityShanghai 201306China

The phase diagram of ZrO_(2)−CaO−TiO_(2)system was essential for the development of photocatalytic materials and refractory *** this work,the ZrO_(2)−CaO−TiO_(2)system was accessed by using the CALPHAD *** substitutional solution models were used to describe liquid and solid solution phases,the sub-lattice models were used to describe ternary compounds,and then the thermodynamic parameters were obtained by the least square method combined with literature experiment *** acquired thermodynamic parameters were used to calculate the isothermal sections of the ZrO_(2)−CaO−TiO_(2)system at 1473 and 1673 *** existed a good agreement between experimental and predicted phase relationships,the experimental points which were inconsistent with calculated results may be attributed to experimental errors and the sluggish kinetics of cations for ZrO_(2)-based *** order to further verify the validity of the database,the thermodynamic parameters were also used to simulate the thermodynamic properties(specific heat capacity,enthalpy,and entropy)of CaZrTi_(2)O_(7) within 5%*** consistency demonstrated that the present thermodynamic database was self-consistent and credible.

关键词： ZrO_(2)−CaO−TiO_(2)system Gibbs free energy model CALPHAD method isothermal sections

Constraints on holographic QCD phase transitions from PTA observations

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Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 71-78页

作者： Song he li li Sai Wang Shao-Jiang Wang Center for Theoretical Physics and College of Physics Jilin University School of Physical Science and Technology Ningbo University Max Planck Institute for Gravitational Physics (Albert Einstein Institute) CAS Key Laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy of Sciences School of Fundamental Physics and Mathematical Sciences Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of Sciences (UCAS) School of Physical Sciences University of Chinese Academy of Sciences (UCAS) Theoretical Physics Division Institute of High Energy Physics Chinese Academy of Sciences

The underlying physics of QCD phase transition in the early Universe remains largely unknown due to its strong-coupling nature during the quark-gluon plasma/hadron gas transition, yet a holographic model has been proposed to quantitatively fit the lattice QCD data while with its duration of the first-order phase transition(FoPT) left undetermined. At specific baryon chemical potential, the first-order QCD phase transition agrees with the observational constraint of baryon asymmetry. It, therefore, provides a scenario for phase transition gravitational waves(GWs) within the standard model of particle physics. If these background GWs could contribute dominantly to the recently claimed common-spectrum red noise from pulsar timing array(PTA) observations, the duration of this FoPT can be well constrained, and the associated primordial black holes are still allowed by current observations.

关键词： pulsar timing array QCD phase transition gravitational waves primordial black holes

COMPUTERIZED PREDICTION AND SYNTheSIS OF TERNARY COMPOUND ZKBr 3MnSO_4

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Chinese Chemical Letters 1996年第8期7卷 781-784页

作者： Xue Ye WANG chong he li De Shan KANGQian Bao ZHAN lin Hong liU Nian Yi CheN(Shanghai Institute of Metallurgy. Chinese Academy of Sciences. Shanghai 200050)

Pattern recognition or back-PrOPagation algorithm of thee-layer artificial neural netWork withchemical bond parameters as features or inputs was applied to reciprocal ternary Me-. Me2 X,X2 type. The formability of ternary compounds in molten salt type was investigated. Computerizedprediction indicates that the K, Mn|Br, SO4 system can form a ternary compound. The new compoundwas confermed by experimental work, and its formula is ZKBr 3MnSO4.

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