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Green, sustainable and massive synthesis of sodium vanadate nanowires toward industrialization

Progress in Natural Science:Materials International 2023年第6期33卷 918-923页

作者： Wei Ni State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization ANSTEEL Research Institute of Vanadium & Titanium (Iron & Steel)

One-dimensional(1D) layered materials combine the advantages of layered materials and 1D nanomaterials,which has attracted intense interest not only in the academic research but also in the industrial *** sodium vanadate nanowires have received incremental attention due to the high capacity and enhanced electrical conductivity for promising advanced energy storage and conversion. However, the mass production of these 1D layered vanadium vanadates(1D NVO) are still of great challenge and the further scalable application in energy storage and conversion systems are hampered. Herein, we developed a facile, non-hydrothermal, green synthesis strategy for scalable, mass production of layered vanadium vanadate nanowires and their assemblies such as membranes, blocks, grains, powders toward industrial scale. It will pave a way for the industrial production of 1D inorganic materials and give a new insight into the fabrication of nanostructured materials beyond commercialized 1D/2D nanomaterials including carbon nanotubes(CNT) and layered double hydroxides(LDH).

关键词： Sodium vanadate nanowires Mass production vanadium-based Barnesite 1D nanomaterials Self-assembly Nanowire membrane Green synthesis

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Gradient nanostructured tungsten and the thermal shock response

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Tungsten 2023年第4期5卷 548-557页

作者： Yan Jiang Ping Huang Zhi-Qiang Jiang Jing Hou Zhong Xu En-Hui Wu Jun Li Vanadium and Titanium Resource Comprehensive Utilization Key Laboratory of Sichuan Province Panzhihua UniversityPanzhihua617000China

In fusion reactor or spallation neutron source environment,damage of tungsten components begins at the *** enhance the surface toughness,strength,and hardness of tungsten,a nano-to-micro sc ale lamellar gradient surface layer(thickness up to~50μm)was produced on as-rolled pure tungsten using a dry-sliding surface *** dry-sliding temperature and time were established by observing the grain-size evolution from room temperature to 750℃and the coefficient of friction on the surface layer after sliding from 10 to 50 *** grains changed into a slender fibrous structure at 250℃,which is higher than the ductile-brittle transition temperature but lower than the dynamic recrystallization temperature(750℃).The coefficient of friction of the surface layer decreased with sliding time and stabilized at approximately 50 min,indicating near-s aturation of the surface *** repetitive thermal loads of 10,20,and 30 MW·m^(-2)on the gradient modified layer,it exhibited mainly recrystallization and grain *** proportion of low-angle grain boundaries(<10°)reached50.6,42.2,and 17.3%,respectively,and the hardness decreased to 602,582,and 488HV.A heat load of 30 MW·m^(-2)was the threshold for the fast grain *** with unmodified tungsten,the recrystallization and grain growth are relatively ***,the gradient layer could suppress the formation of pits and protrusions in the as-rolled tungsten sample.

关键词： Gradient layer Tungsten Dry sliding Coefficient of friction

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Causes of surface stripe cracks of Ti–4Al–2V alloy cold-rolled sheet

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Rare Metals 2014年第5期33卷 522-526页

作者： De-Ming Huang Xiong-Fei Yang Qing-Feng Wei Yong Chen Hua Guo Sheng-Long Liang Ying Wang Pangang Group Research Institute Co. Ltd. State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization

The stripe cracks which formed along rolling direction on the surface of Ti–4Al–2V alloy cold-rolled sheet were observed by stereoscope, scanning electron microscope（SEM）, and energy-dispersive spectrometer（EDS）. Morphology analysis indicates that cracks are dominantly in zigzag shape, with 10–30 mm in length and less than 10 lm in depth, and there is no evidence of crack tips. Chemical composition analysis shows that crack regions feather high oxygen concentration while smooth surface is at normal oxygen level. It is obvious that the occurrence of strip cracks is mainly related to residual oxide on the surface of Ti–4Al–2V alloy cold-rolled sheet.

关键词： Ti-4Al-2V Cold-rolled sheet Surface Stripe cracks

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Enhanced energy storage performance of BNT-SBT lead-free ceramics by a collaborative strategy of electrical properties modulation and grain refining via introducing KNN

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Ceramics International 2025年

作者： Long, Qiyu Zuo, Chengyang Xiao, Shihong Wei, Xianhua State Key Laboratory of Environmental-friendly Energy Materials Southwest University of Science and Technology Mianyang621010 China Vanadium and Titanium Resource Comprehensive Utilization Key Laboratory of Sichuan Province Panzhihua University Panzhihua617000 China

High-performance dielectric energy storage ceramics require high recoverable energy storage density, exceptional efficiency and eco-friendliness. However, it is still a challenge for Bi0.5Na0.5TiO3 lead-free ceramic due to its large remnant polarization. To address this, we have designed and fabricated (1-x)(0.55Bi0.5Na0.5TiO3-0.45Sr0.7Bi0.2TiO3)-xK0.5Na0.5NbO3 ((1-x)(BNT-SBT)-xKNN) by solution combustion synthesis (SCS) method. After the introduction of KNN, the change of dielectric relaxation behavior is found, and the bandgap widening and grain size refining are also observed. These collaborate to obtain a high recoverable energy storage density (6.68 J/cm3) and a high efficiency (87 %) under a high electric field of 517 kV/cm in 0.95(BNT-SBT)-0.05KNN (5xKNN). Furthermore, the 5xKNN samples exhibit excellent stability in terms of frequency, temperature, and cycling. Additionally, a large power density of ∼138.53 MW/cm3 (at 360 kV/cm), and an ultrafast discharge time of ∼97.2 ns are achieved. This work indicates that a collaborative strategy of electrical properties modulation and grain refining is effective for designing advanced dielectric energy storage ceramics with exceptional performance. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Ceramic capacitors

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Chemical dehydration coupling multi-effect evaporation to treat waste sulfuric acid in titanium dioxide production process

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Chinese Journal of Chemical Engineering 2020年第4期28卷 1162-1170页

作者： Hongyin Pang Ruifang Lu Tao Zhang Li Lü Yanxiao Chen Shengwei Tang State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization Panzhihua 617000China School of Chemical Engineering Sichuan UniversityChengdu 610065China

In order to concentrate the diluted sulfuric acid from the titanium dioxide(TiO2)production of sulphate process,a new concentration process was proposed by coupling chemical dehydration and multi-effect *** ferrous sulfate monohydrate(FeSO4·H2O),as the dehydrant,was added to the diluted sulfuric acid to form ferrous sulfate heptahydrate(FeSO4·7H2O)according to the H2SO4-FeSO4-H2O phase diagrams,which partially removes the *** process was named as Chemical Dehydration *** residual water was further removed by two-effect evaporation and finally 70 wt%sulfuric acid was *** FeSO4·H2O can be regenerated through drying and dehydration of FeSO4·*** results show that FeSO4·H2O is the most suitable dehydrant,the optimal reaction time of chemical dehydration process is 30 min,and low temperature is favorable for the dehydration reaction.45.17%of the entire removed water can be removed by chemical dehydration from the diluted sulfuric *** chemical dehydration process is also energy efficient with 24.76%saving compared with the direct evaporation ***,51.21%of the FeSO4 dissolved originally in the diluted sulfuric acid are precipitated out during the chemical dehydration,which greatly reduces the solid precipitation and effectively alleviates the scaling in the subsequent multi-effect evaporation process.

关键词： Chemical dehydration Multi-effect evaporation Sulfuric acid titanium

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Effect of hot-dip galvanizing processes on the microstructure and mechanical properties of 600-MPa hot-dip galvanized dual-phase steel

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International Journal of Minerals,Metallurgy and Materials 2017年第12期24卷 1379-1383页

作者： Chun-fu Kuang Zhi-wang Zheng Min-li Wang Quan Xu Shen-gen Zhang State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization Research Institute of Pangang Group Institute for Advanced Materials and Technology University of Science and Technology Beijing

A C–Mn dual-phase steel was soaked at 800°C for 90 s and then either rapidly cooled to 450°C and held for 30 s(process A) or rapidly cooled to 350°C and then reheated to 450°C(process B) to simulate the hot-dip galvanizing process. The influence of the hot-dip galvanizing process on the microstructure and mechanical properties of 600-MPa hot-dip galvanized dual-phase steel(DP600) was investigated using optical microscopy, scanning electron microscopy(SEM), transmission electron microscopy(TEM), and tensile tests. The results showed that, in the case of process A, the microstructure of DP600 was composed of ferrite, martensite, and a small amount of bainite. The granular bainite was formed in the hot-dip galvanizing stage, and martensite islands were formed in the final cooling stage after hot-dip galvanizing. By contrast, in the case of process B, the microstructure of the DP600 was composed of ferrite, martensite, bainite, and cementite. In addition, compared with the yield strength(YS) of the DP600 annealed by process A, that for the DP600 annealed by process B increased by approximately 50 MPa because of the tempering of the martensite formed during rapid cooling. The work-hardening coefficient(n value) of the DP600 steel annealed by process B clearly decreased because the increase of the YS affected the computation result for the n value. However, the ultimate tensile strength(UTS) and elongation(A80) of the DP600 annealed by process B exhibited less variation compared with those of the DP600 annealed by process A. Therefore, DP600 with excellent comprehensive mechanical properties(YS = 362 MPa, UTS = 638 MPa, A_(80) = 24.3%, n = 0.17) was obtained via process A.

关键词： hot-dip galvanizing process dual-phase steel microstructure mechanical properties

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Adsorption Performance and Photocatalytic Activity of La-TiO2@kaolin Composites 4

Adsorption Performance and Photocatalytic Activity of La-TiO...

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2024 4th International Conference on Fluid and Chemical Engineering, ICFCE 2024

作者： Zhan, Zhixing Peng, Fuchang Liu, Jingjing Liu, Qiaochu Yan, Yue'E School of Vanadium & Titanium Panzhihua University China Vanadium and Titanium Resource Comprehensive Utilization Key Laboratory Sichuan Province Panzhihua617000 China

La-TiO2@kaolin(LTK) composites were prepared via sol-gel method with kaolin, lanthanum nitrate and tetrabutyl titanate as raw materials. The samples were characterized by XRD, SEM/EDS, and UV-Vis. The visible light photocatalytic reduction activity and adsorption performance of samples for Cr(VI) were studied. The results showed that La doping can refine TiO2 grains, stabilize phase structure of anatase TiO2, and expand its absorption spectrum, thereby enhancing its photocatalytic reduction activity. Due to the composite of kaolin, the dispersion of TiO2 is improves and it is endowed with a large specific surface area lead to enhance its adsorption ability for Cr(VI). The adsorption equilibrium process of LTK for Cr(VI) conforms to the Langmuir equation model. The coupling effect of doping and composite modification improves the adsorption and visible light catalytic reduction activity of Cr(VI) over composite material samples. The adsorption-photocatalytic removal rate of LTK for Cr(VI) under visible light irradiation for 6 hours reached the highest of 96.5%. The apparent first-order kinetic constant of its photocatalytic reduction reaction was 2.6 times that of pure TiO2. © Published under licence by IOP Publishing Ltd.

关键词： Sol-gels

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Effects of overaging temperature on the microstructure and properties of 600MPa cold-rolled dual-phase steel

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International Journal of Minerals,Metallurgy and Materials 2016年第8期23卷 943-948页

作者： Chun-fu Kuang Zhi-wang Zheng Gong-ting Zhang Jun Chang Shen-gen Zhang Bo Liu State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization Research Institute of Pangang GroupPanzhihua 617000China Institute for Advanced Materials and Technology University of Science and Technology BeiiingBeiiing 100083China

C–Mn steels prepared by annealing at 800°C for 120 s and overaging at 250–400°C were subjected to pre-straining（2%） and baking treatments（170°C for 20 min） to measure their bake-hardening（BH_2） values. The effects of overaging temperature on the microstructure, mechanical properties, and BH_2 behavior of 600 MPa cold-rolled dual-phase（DP） steel were investigated by optical microscopy, scanning electron microscopy, and tensile tests. The results indicated that the martensite morphology exhibited less variation when the DP steel was overaged at 250–350°C. However, when the DP steel was overaged at 400°C, numerous non-martensite and carbide particles formed and yield-point elongation was observed in the tensile curve. When the overaging temperature was increased from 250 to 400°C, the yield strength increased from 272 to 317 MPa, the tensile strength decreased from 643 to 574 MPa, and the elongation increased from 27.8% to 30.6%. Furthermore, with an increase in overaging temperature from 250 to 400°C, the BH_2 value initially increases and then decreases. The maximum BH_2 value of 83 MPa was observed for the specimen overaged at 350°C.

关键词： dual-phase steel overaging temperature microstructure mechanical properties carbides

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The Research on The Deoxidization Process of Calcium Based Deoxidizer

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2nd International Conference on Chemical, Material and Metallurgical Engineering (ICCMME 2012)

作者： Wang, Jian PanGang Group Research Institute Co. Ltd. State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization China

ISBN: (纸本)9783037855898

According to the compositional design of the calcium deoxidizer and the actual practice of producing HRB335 via converter-in BOF end, the percentages of [C] is 0.032%, the concentration of a[O] is 980ppm, the addition of calcium deoxidizer is 1.36Kg per ton of steel, and the argon oxygen activity is 42.84 ppm. The effect of deoxidization exceed the deoxidizer CaBaAlSi, the effect of deoxidization is fine and the product of deoxidization has no adverse effect on the steel quality. This deoxidization process could not only satisfy the quality requirement of the product, but also significantly reduce the cost. And both the finished product rate of rolled products and the mechanical properties meet the requirements of the national standard.

关键词： calcium based deoxidizer deoxidization process

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Optimizing Control for 20CrMnTiH(FQ) Bloom Internal Quality by EMS 7

Optimizing Control for 20CrMnTiH(FQ) Bloom Internal Quality ...

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7th Annual International Conference on Material Science and Engineering, ICMSE 2019

作者： Li, H.G. Chen, T.M. Chen, L. Pangang Group Research Institute Co. Ltd. State Key Laboratory of Vanadium and Titanium Resource Comprehensive Utilization Sichuan Panzhihua617000 China

Continuous casting EMS technology for 20CrMnTiH(FQ)gear steel bloom internal quality optimizing control was researched, based on the equipment of 360mmX450mm bloom casting machine conditions which is one factory of China. Ensure the install position of F-EMS which installed close at the end of liquid core by take numerical simulate calculation for the process of solidifying and heat transfer, measured the stirring magnetic field intensity(T), and carried out comparing experiment to find out the effects of stirring intensity on bloom internal quality, the optimal process parameters of combined EMS have been defined at last, taim to control 20CrMnTiH(FQ) gear steel bloom internal quality to be densify and homogenize have been realized. © Published under licence by IOP Publishing Ltd.

关键词： Continuous casting

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