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Self-Healing Liquid Metal Magnetic Hydrogels for Smart Feedback Sensors and High-Performance Electromagnetic Shielding

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Nano-Micro Letters 2023年第6期15卷 112-125页

作者： Biao Zhao Zhongyi Bai Hualiang Lv Zhikai Yan Yiqian Du Xiaoqin Guo Jincang Zhang Limin Wu Jiushuai Deng David Wei Zhang Renchao Che School of Microelectronics Fudan UniversityShanghai 2000433People’s Republic of China laboratory of Advanced Materials Shanghai Key Lab of Molecular Catalysis and Innovative MaterialsAcademy for Engineering&TechnologyFudan UniversityShanghai 200438People’s Republic of China key laboratory of separation and Processing of Symbiotic‑Associated Mineral Resources in non‑ferrous Metal industry School of Chemical&Environmental EngineeringChina University of Mining&Technology(Beijing)Beijing 100083People’s Republic of China Institute of Optoelectronics Fudan UniversityShanghai 200433People’s Republic of China Henan key laboratory of Aeronautical Materials and Application Technology School of Material Science and EngineeringZhengzhou University of AeronauticsZhengzhou 450046HenanPeople’s Republic of China Zhejiang laboratory Hangzhou 311100People’s Republic of China Inner Mongolia University Hohhot 010021People’s Republic of China

Hydrogels exhibit potential applications in smart wearable devices because of their exceptional sensitivity to various external ***,their applications are limited by challenges in terms of issues in biocompatibility,custom shape,and ***,a conductive,stretchable,adaptable,self-healing,and biocompatible liquid metal GaInSn/Ni-based composite hydrogel is developed by incorporating a magnetic liquid metal into the hydrogel framework through crosslinking polyvinyl alcohol(PVA)with sodium *** excellent stretchability and fast self-healing capability of the PVA/liquid metal hydrogel are derived from its abundant hydrogen binding sites and liquid metal ***,owing to the magnetic constituent,the PVA/liquid metal hydrogel can be guided remotely using an external magnetic field to a specific position to repair the broken wires with no need for manual *** composite hydrogel also exhibits sensitive deformation responses and can be used as a strain sensor to monitor various body ***,the multifunctional hydrogel displays absorption-dominated electromagnetic interference(EMI)shielding *** total shielding performance of the composite hydrogel increases to~62.5 dB from~31.8 dB of the pure PVA hydrogel at the thickness of 3.0 *** proposed bioinspired multifunctional magnetic hydrogel demonstrates substantial application potential in the field of intelligent wearable devices.

关键词： EMI shielding Liquid metal Hydrogel Self-healing properties Strain sensor Magnetic patterning

两步真空蒸馏法从复杂铅锑硫化矿中提取硫化锑

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Journal of Central South University 2023年第1期30卷 132-141页

作者：李玲杨勉熊恒王艺曌杨斌 Faculty of metallurgical and Energy engineering Kunming University of Science and TechnologyKunming 650093China National engineering laboratory for Vacuum Metallurgy Kunming 650093China State key laboratory Breeding Base of Complex non-ferrous Metal Resources Clear Utilization in Yunnan Province Kunming 650093China

锑元素具有亲硫性,在矿物中多以硫化物的形式存在。锑最重要的硫化物为Sb2S3,在电池材料、军事工业等领域被广泛应用。随着单一锑硫化矿资源的日益枯竭,复杂铅锑硫化矿成为制备锑金属材料的重要矿物。为实现锑金属的高效提取与利用,本... 详细信息

锑元素具有亲硫性,在矿物中多以硫化物的形式存在。锑最重要的硫化物为Sb2S3,在电池材料、军事工业等领域被广泛应用。随着单一锑硫化矿资源的日益枯竭,复杂铅锑硫化矿成为制备锑金属材料的重要矿物。为实现锑金属的高效提取与利用,本文采用两步真空蒸馏法从复杂铅锑硫化矿物中获得高纯度Sb2S3,从矿物源头实现锑与其他金属的分离。考察了蒸馏温度、时间对Sb2S3的纯度和锑元素直收率的影响。结果表明,在5 Pa的条件下,矿中的脆硫铅锑矿(Pb4FeSb6S14)在750℃完全分解为PbS,Sb2S3和FeS。在650℃保温80 min,第一步真空蒸馏获得的Sb2S3纯度为99.07 wt%。对第一步得到的残留物在800℃保温40 min,第二步真空蒸馏得到的Sb2S3纯度为99.41 wt%。两步真空蒸馏锑的直收率达到95.84%。真空蒸馏实现了复杂铅锑硫化矿中锑资源的高效利用,获得了纯度99 wt%的Sb2S3,为从含锑矿产资源中直接提取Sb2S3提供了一种有效方法。

关键词：两步法真空蒸馏铅锑硫化矿硫化锑直收率

Iron and copper recovery from copper slags through smelting with waste cathode carbon from aluminium electrolysis

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Journal of Central South University 2021年第7期28卷 2010-2021页

作者： MAO Kai-xuan LI Lei XU Miao State key laboratory of Complex non-ferrous Metal Resources Clean Utilization Kunming University of Science and TechnologyKunming 650093China engineering Research Center of metallurgical Energy Conservation and Emission Reduction of Ministry of Education Kunming University of Science and TechnologyKunming 650093China Faculty of metallurgical and Energy engineering Kunming University of Science and TechnologyKunming 650093China

To recover metal from copper slags,a new process involving two steps of oxidative desulfurization followed by smelting reduction was proposed in which one hazardous waste(waste cathode carbon)was used to treat another(copper slags).The waste cathode carbon is used not only as a reducing agent but also as a fluxing agent to decrease slag melting *** holding for 60 min in air atmosphere first and then smelting with 14.4 wt%waste cathode carbon and 25 wt%CaO for 180 min in high purity Ar atmosphere at 1450℃,the recovery rates of Cu and Fe reach 95.89%and 94.64%,respectively,and meanwhile greater than 90%of the fluoride from waste cathode carbon is transferred into the final slag as CaF_(2) and Ca_(2)Si_(2)F_(2)O_(7),which makes the content of soluble F in the slag meet the national emission ***,the sulphur content in the obtained Fe-Cu alloy is low to 0.03 wt%.

关键词： copper slags waste cathode carbon oxidative desulfurization smelting reduction iron and copper recovery fluoride

Research on testing method of resin sand high temperature compressive strength

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China Foundry 2016年第5期13卷 335-341页

作者： Peng Wan Luan-cai Li Long Zhang Wen-qing Wang State key laboratory of Materials Processing and Die & Mould Technology Huazhong University of Science & Technology School of metallurgical engineering Anhui University of Technology

High temperature compressive strength is one of the most important performances of resin sand; its value directly concerns the quality of castings. In order to seek the best testing method of resin sand high temperature compressive strength, a self-developed instrument was used to carry out experiments, and the sample shape and size were designed and studied. The results show that a hollow cylinder sample can reflect the strength difference of different resin sands better than a solid cylinder sample, and its data is stable. The experiments selected φ20/5×30 mm as the size of the hollow cylinder samples. The high temperature compressive strengths of phenol-formaldehyde resin coated sand, furan resin self-setting sand, and TEA resin sand were each tested. For the resin sand used for cast steel and cast iron, 1,000 ℃ was selected as the test temperature; for the resin sand used for cast non-ferrous alloy, 800 ℃ was selected as the test temperature; and for all the resin sand samples, 1 min was selected as the holding time. This testing method can truthfully reflect the high temperature performance of three kinds of resin sand; it is reproducible, and the variation coefficients of test values are under 10%.

关键词： resin sand high temperature compressive strength hollow cylinder specimens variation coefficient

Corrosion and wear properties of micro-arc oxidation treated Ti6Al4V alloy prepared by selective electron beam melting

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Transactions of nonferrous metals Society of China 2020年第8期30卷 2132-2142页

作者： Xin YANG Wan-lin WANG Wen-jun MA Yan WANG Jun-gang YANG Shi-feng LIU Hui-ping TANG School of Materials science and engineering Xi’an University of TechnologyXi’an 710048China School of metallurgical and engineering Xi’an University of Architecture and TechnologyXi’an 710055China State key laboratory of Porous Metal Materials Northwest Institute for Non-ferrous Metal ResearchXi’an 710016China

In order to analyze the effect of voltage during micro-arc oxidation(MAO)on corrosion and wear properties of Ti6Al4V(TC4),the MAO technology was employed to treat TC4 samples fabricated by selective electron beam melting(SEBM)at the voltages of 400,420 and 450 *** results show that the metastable anatase phase gradually transforms to rutile phase with oxidation time and temperature *** surface morphology of coating contains numerous micropores with uniform size *** and pores over 10μm are found on MAO-TC4 sample with applied voltage of 450 *** thickness of MAO coating is positively correlated with the *** corrosion resistance and wear resistance are related to phase composition,micropore size distribution on the surface and film *** the voltage is 420 V,the coating shows the smallest corrosion current density(0.960×10^-7 A/cm^2)and the largest resistance(7.17×10^5Ω·cm^2).Under the same load condition,the coating exhibits larger friction coefficient and wear loss than the TC4 *** the increase of voltage,the wear mechanism of the coating changes from abrasive wear to adhesive wear,and the adhesive wear is intensified at applied voltage of 450 V,with a maximum friction coefficient of 0.821.

关键词： selective electron beam melting micro-arc oxidation TC4 alloy corrosion wear property

Preparation of microsized hematite powder from ferrous sulfate via microwave calcination

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Journal of Central South University 2017年第8期24卷 1720-1726页

作者：刘秉国余延涛彭金辉 C.Srinivasakannan 张利波郭胜惠 Faculty of metallurgical and Energy engineering Kunming University of Science and TechnologyKunming 650093China State key laboratory of Complex nonferrous Metal Resources Clean Utilization in Yunnan Province Kunming 650093China key laboratory of Unconventional Metallurgy of Ministry of Education Kunming University of Science and TechnologyKunming 650093China Chemical engineering Department the Petroleum InstituteAbu DhabiUAE

The preparation of microsized hematite powder from ferrous sulfate using microwave calcination was investigated based on the TG/DTG curves. The decomposition of industrial ferrous sulfate under air atmosphere was divided into three stages, and a ferrous sulfate sample added with 15% Fe_2O_3 could strongly absorb microwave energy. Therefore, preparing hematite powder from ferrous sulfate using microwave calcination was feasible. Hematite was obtained under the following optimized conditions: calcination temperature, 850 °C; microwave power, 650 W; and sample amount, 40 g. The obtained hematite satisfied the first-grade quality requirements. The total ferrum value was more than 58%, and the total sulfur and phosphorus contents were less than 0.5% and 0.2%, respectively. X-ray powder diffraction and scanning electron microscopy were used to characterize the structure and morphology of microsized hematite powder. The particles were non-spherical in shape, and the average particle size distribution was 10.45 μm. This work provides new potential applications for waste ferrous sulfate.

关键词： hematite microwave calcination ferrous sulfate heating behavior microsize

Microstructure and Mechanical Properties in Friction Stir Welded Thick Al–Zn–Mg–Cu Alloy Plate

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Acta Metallurgica Sinica(English Letters) 2022年第8期35卷 1329-1342页

作者： Fei Qiang Wen Wang Ke Qiao Pai Peng Ting Zhang Xiao-Hu Guan Jun Cai Qiang Meng Hua-Xia Zhao Kuai-She Wang School of metallurgical engineering National and Local Joint Engineering Research Center for Functional Materials ProcessingXi'an University of Architecture and TechnologyXi'an 710055China Northwest Institute for non-ferrous Metal Research Xian 710016China AVIC Manufacturing Technology Institute Bejing 100024China Beijing FSW Technology Co.Ltd Bejing 101107China

In this work, 20-mm-thick aluminum-alloy plates were joined via friction stir welding. The temperature gradient was reduced by reducing the surface welding heat input to achieve uniformity of the mechanical properties across the thick plate joints. The welding temperature was measured using thermocouples. The microstructures were observed via electron backscatter diff raction and transmission electron microscopy. The tensile properties of the samples sliced along the thickness direction of the joint were evaluated. The results show that the highest welding peak temperature is 430℃ on the advancing side on the top surface of the joint. The grain size gradually decreased along the thickness direction, and grain refi nement was due to the combination of continuous, discontinuous, and geometric dynamic recrystallization. The tensile properties of the sliced samples were found to be uniform, and the ultimate tensile strength reached 62% of that of the base metal. The main strengthening mechanism of the Al–Zn–Mg–Cu alloy joints consists of precipitation strengthening. In addition, the η ` → η phase transition and grain coarsening in the heat-affected zone were found to be responsible for the fracture of the joints.

关键词： Friction stir welding Aluminum alloy thick plate Dynamic recrystallization Mechanical properties Precipitated phase

Strain transfer behavior and crystallographic mechanism of crack initiation during cyclic deformation in zirconium

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Journal of Materials science & Technology 2023年第31期162卷 234-246页

作者： Xiangkang Zeng Conghui Zhang Wenguang Zhu Mingliang Zhu Tongguang Zhai Chi Ma Tingchuang Shu KangKai Song School of metallurgical engineering Xi’an University of Architecture and TechnologyXi’an 710055China key laboratory of Pressure Systems and Safety Ministry of EducationSchool of Mechanical and Power EngineeringEast China University of Science and TechnologyShanghai 200237China School of Materials science and engineering Shandong Jianzhu UniversityJinan 250101China

Fully-reversed cyclic deformation of a pure Zr(a thickness of 17 mm)was conducted at two different strain amplitudes(0.4%and 0.8%)to investigate the deformation and crack initiation behaviors based on slip trace *** was found that prismaticaslip with a higher Schmid Factor(m>0.4)was the dominant deformation *** grains containing persistent slip bands(PSBs)tended to go towards[1210]pole and the Schmid Factor had a critical value of 0.4 above which prismatic and pyramidal slip were *** cracks were mainly initiated at PSBs and grain boundaries(GBs).It showed that 61.1%of the cracks were PSB cracks under a strain amplitude of 0.4%,while it decreased to 53.5%at a strain amplitude of 0.8%.PSB cracks were mainly parallel to prismaticaslip with higher Schmid Factor while some cracks tended to be initiated at GBs with higher misorientation *** interaction of PSBs with GBs would result in strain transferring to the neighboring *** transfer was more likely to occur at the condition of the higher geometrical compatibility factor m,and lower residual Burgers vectorb,which could reduce strain localization.

关键词： Fatigue crack initiation Crystallographic orientation PSBs GBs Strain transfer

Theoretical analysis and experimental verification of thermal decomposition mechanism of CuSe

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Transactions of nonferrous metals Society of China 2022年第10期32卷 3478-3486页

作者： Huan LUO Heng XIONG Wen-long JIANG Lang LIU Guo-zheng ZHA Tian-tian ZHEN Bin YANG Bao-qiang XU National engineering Research Center of Vacuum Metallurgy Kunming University of Science and TechnologyKunming 650093China Faculty of metallurgical and Energy engineering Kunming University of Science and TechnologyKunming 650093China Yunnan Provincial key laboratory for nonferrous Vacuum Metallurgy Kunming University of Science and TechnologyKunming 650093China State key laboratory of Complex non-ferrous Metal Resources Clean Utilization Kunming University of Science and TechnologyKunming 650093China

Experiments on the thermal decomposition of CuSe were carried out by using a thermogravimetric analyzer(TGA)at different heating *** kinetic parameters and mechanisms were discussed based on model-free and model-based *** decomposition rate and decomposition behavior of CuSe were investigated by using a vacuum thermogravimetric *** results showed that the R3 model was identified as the most probable mechanism function under the present experimental *** average values of activation energy and the pre-exponential factor were 12.344 J/mol and 0.152 s^(−1),*** actual decomposition rate of CuSe was found to be 0.0030 g/(cm^(2)·min).

关键词： CuSe thermal decomposition non-isothermal kinetics mechanism