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Using HyperCoal to prepare metallurgical coal briquettes via hot-pressing

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International Journal of Minerals,Metallurgy and Materials 2019年第5期26卷 547-554页

作者： Ya-jie Wang Hai-bin Zuo Jun Zhao Wan-long Zhang State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing

HyperCoal was prepared from low-rank coal via high-temperature solvent extraction with N-methylpyrrolidone as an extraction solvent and a liquid-to-solid ratio of 50 mL/g in a high-temperature and high-pressure reactor. When HyperCoal was used as a binder and pulverized coal was used as the raw material, the compressive strength of the hot-pressed briquettes(each with a diameter of 20 mm and mass of 5 g) under different conditions was studied using a hot-pressing mold and a high-temperature furnace. The compressive strength of the hot-pressed briquettes was substantially improved and reached 436 N when the holding time period was 15 min, the hot-pressing temperature was 673 K, and the HyperCoal content, was 15 wt%. Changes in the carbonaceous structure, as reflected by the intensity ratio between the Raman G-and D-bands(IG/ID), strongly affected the compressive strength of hot-pressed briquettes prepared at different hot-pressing temperatures. Compared with cold-pressed briquettes, hot-pressed briquettes have many advantages, including high compressive strength, low ash content, high moisture resistance, and good thermal stability; thus, we expect that hot-pressed briquettes will have broad application prospects.

关键词： HyperCoal coal briquette compressive strength binder hot-pressing

Microstructural characteristics and mechanical behavior of B4Cp/6061Al composites synthesized at different hot-pressing temperatures

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Journal of Materials Science & Technology 2019年第8期35卷 1523-1531页

作者： Minqiang Gao Zongning Chen Huijun Kang Enyu Guo Rengeng Li Ying Fu Honglan Xie Tongmin Wang Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024 China Engineering Institute Bohai UniversityJinzhou 121013 China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201204 China

B4Cp/6061Al composites have become important structural and functional materials and can be fabricated by powder metallurgy and subsequent hot rolling. In this work, the effects of the hot-pressing temperature on microstructures and mechanical behaviors of the B4Cp/6061Al composites were investigated. The results showed that compared with the T4 heat treated B4Cp/6061Al composite hot pressed at 560℃, the yield strength and failure strain of the composites hot pressed at 580℃ were increased to 235 MPa and 18.4%, respectively. This was associated with the interface bonding strength between the B4C particles and the matrix. However, the reaction products, identified to be MgAl2O4 phases, were detected in the composites hot pressed at 600℃. The formation of the MgAl2O4 phases resulted in the Mg depletion, thus reducing the yield strength to 203.5 MPa after the T4 heat treatment due to the effect of the solid solution strengthening being weakened. In addition, the variation of hardness and electrical conductivity was mainly related to the Mg content in the matrix. Based on the as-rolled microstructures observed by SEM, SR-μCT and fracture surfaces, the deformation schematic diagram was depicted to reflect the tensile deformation process of the composites.

关键词： B4Cp/6061Al composite hot-pressing temperature Microstructure Mechanical behavior Reaction product

One step hot-pressing method for hybrid Li metal anode of solid-state lithium metal batteries

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Journal of Materials Science & Technology 2023年第22期153卷 32-40页

作者： Kaiming Wang Yifei Chen Liang Zhang Qihang Zhang Zhi Cheng Yining Su Fei Shen Xiaogang Han State Key Laboratory of Electrical Insulation and Power Equipment School of Electrical EngineeringXi’an Jiaotong UniversityXi’an 710049China School of Future Technology Xi’an Jiaotong UniversityXi’an 710049China Key Laboratory of Smart Grid of Shaanxi Province Xi’anXi’an 710049China National Innovation Platform(Center)for Industry-Education Integration of Energy Storage Technology Xi’an 710049China

Safety issues induced by infinite anode volume change and uncontrolled lithium(Li)dendrite growth have become the biggest obstacle to the practical application of Li metal *** addition,the tra-ditional rolling method makes it difficult to manufacture thin Li foil with high mechanical strength and low Li ***,a three-dimensional(3D)lithophilic carbon paper/copper(Cu)current collector hybrid anode with ultra-low Li metal content is prepared by a hot-pressing *** highly re-versible and stable lithiophilic layer LiC_(x) formed in situ by heating/pressing treatment provides abun-dant nucleation sites and reduces the Li nucleation overpotential,thereby effectively suppressing Li den-drite ***,the volume change and pulverization problems of Li metal anode during depo-sition/stripping also can be accommodated by the 3D *** optimization effect has been directly confirmed by in-situ optical and ex-situ scanning electron microscope ***,highly sta-ble performance(158.4 mA h g^(-1) at 2 C after 200 cycles with a capacity retention of 95.24%)in Li@LCP-Cu||NCM811 coin cell can be ***,the solid-state battery assembled with the hybrid anode,poly(vinylidene fluoride)(PVDF)-based polymer electrolyte and polyethylene oxide(PEO)interface functional layer also exhibits the best electrochemical and safety performance,which also proves that the Li@LCP-Cu anode has great potential for application in solid-state batteries.

关键词： hot-pressing Hybrid anode Lithiophilic layer licx Li dendrite Solid-state batteries

Freeze-drying and hot-pressing strategy to embed two-dimensional Ti_(0.87)O_(2) monolayers in commercial polypropylene films with enhanced dielectric properties

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Journal of Advanced Ceramics 2021年第2期10卷 368-376页

作者： Wenchao Tian Fei Yan Cailing Cai Zeyi Wu Chenchen Zhang Ting Yin Sijia Lao Linfeng Hu Department of Materials Science Fudan UniversityShanghai200433China State Grid Anhui Electric Power Institute Hefei230022China China Electric Power Research Institute Beijing100192China

The dielectric capacitor has been widely used in advanced electronic and electrical power systems due to its capability of ultrafast charging–discharging and ultrahigh power ***,its energy density is still limited by the low dielectric constant(≈2.2)of the commercial dielectric polypropylene(PP).The conventional enhancement strategy by embedding inorganic fillers in PP matrix is still difficult and challenging due to that PP hardly dissolves in any inorganic/organic *** this work,we develop a new strategy including freeze-drying,surface functionalization,and hot-pressing to incorporate Ti_(0.87)O_(2) monolayers in PP film.A series of uniform composited Ti_(0.87)O_(2)@PP film has been successfully fabricated with Ti0.87O2 content range of 0–15 wt%.The maximum dielectric constant of the as-prepared Ti_(0.87)O_(2)@PP film is 3.27 when the Ti_(0.87)O_(2) content is 9 wt%,which is about 1.5 times higher than that of pure *** study provides a feasible strategy to embed two-dimensional material into commercial PP thin-film with superior dielectric performance for practical application.

关键词： Ti_(0.87)O_(2)nanosheets polypropylene(PP) freeze-drying surface functionalization hot-pressing dielectric constant

RELATIONSHIP　OF　THE　PROPERTIES　OF　hot－pressing　C－BC_4－SiC　COMPOSITE　WITH　THE　CONTENT　OF　ADDITIVE　Al

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中国有色金属学会会刊：英文版 1995年第3期5卷 93-96页

作者： Huang, Qizhong Tan, Ping Yang, Qiaoqin Huang, Baiyun Lu, Haibo Yu, Guowen Central South Univ of Technology Changsha China

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关键词： additive Al C-B4C-SiCcomposite hot-pressing property

Densification Behavior of Nanocrystalline Mg2Si Compact in hot-pressing

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Journal of Materials Science & Technology 2007年第5期23卷 595-598页

作者： Wei XIONG Xiaoying QINt Li WANG Key Laboratory of Materials Physics Institute of Solid State Physics Chinese Academy of Sciences Hefei 230031 China

Densification behavior of nanocrystalline Mg2Si （n-Mg2Si） with grain size about 30-50 nm was investigated by hot-pressing at 400℃. The results indicated that the densification process of n-Mg2Si exhibited three linear segments： p〈0.3 GPa, 0.3 GPa〈p〈1.2 GPa, and p〉1.2 GPa determined by Heckel formula, among which the third fast increasing segment in high pressure range p〉1.2 GPa has seldom been reported in conventional coarse-grained polycrystalline materials. Nevertheless, in the whole pressure range （0.125-1.500 GPa） investigated the densification behavior of n-Mg2Si can be well described by a Kawakita formula p/C=（1/a）p＋ 1/（ab） with constant α=0.452 being in good agreement with the initial porosity of the compact.

关键词： Nanocrystalline Mg2Si Densification behavior hot-pressing

Microstructure and Mechanical Properties of FeAl Intermetallics Prepared by Mechanical Alloying and hot-pressing

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Tsinghua Science and Technology 2009年第3期14卷 300-306页

作者：宋海霞吴运新唐传安袁帅巩前明梁吉 Department of Mechanical Engineering Tsinghua UniversityBeijing 100084 China Department of Mechanical Engineering Army Aviation Institute of PLABeijing 101123 China

FeAl intermetallics were prepared by mechanical alloying and vacuum hot-pressing. The Fe-48 at.% Al powder was ball-milled for 3-12 h, producing a solid solution structure of Fe （Al） with trace Al （Fe）. Subsequent vacuum annealing or hot-pressing introduced phase transformations into the FeAl （B2） intermetallics and Al2O3 inclusions. The hot-pressed FeAI intermetallics possess a high flexural strength of 831 MPa and a fairly good strain at break of 3.2%. The results show that the addition of 0.5 at.% B reduces the peak temperature for hot-pressing from 1180℃ to 1100℃, and increases the density of the compacts from 95% to 96.3%, but results in no significant improvement in the mechanical properties.

关键词： FeAl intermetallics mechanical alloying powder hot-pressing flexural strength

Preparation of MgF_2 Translucent Ceramic by hot pressing Sintering

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Journal of Wuhan University of Technology(Materials Science) 2015年第4期30卷 720-723页

作者：彭敏红 CAO Weiping 宋金红 Center of Materials Research and Analysis Wuhan University of Technology State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

The aim of this work was to prepare MgF2 translucent ceramic by using nanopowders as raw materials and to study its *** MgF2 nanopowders were prepared using chemical precipitation and the translucent ceramics were fabricated by hot-pressing sintering in a vacuum environment. X-ray diffraction analysis showed that the powders were homogeneous with an average particles size about 13 nm. By comparing the results of transmission electron microscopy, it could be concluded that the porous structure of precursor powders could be improved by calcination. The SEM images of MgF2 indicated that the as-prepared ceramics were well densified at 900 ℃. The photo of the ceramic sample showed that high translucence is a main breakthrough in the field of MgF2 materials preparation. For the translucent ceramic sample sintered at 900 ℃, the Viekers hardness and density were 5.55 GPa and 98.74%, respectively, and its highest transmittance with thickness of lmm reached 87% in the wavelength from 2.5 lain to 10 btm, all which made it advantageous to be a kind of infrared windows and dome materials.

关键词： MgF2 nanopowders calcination hot-pressing translucent ceramic

Thermoelectric properties of quaternary Mg_2Sn_(0.4)Si_(0.6-x)Ge_x alloys

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International Journal of Minerals,Metallurgy and Materials 2009年第5期16卷 564-567页

作者： Hao Yin Xin-Bing Zhao Qian Zhang Tie-Jun Zhu State Key Laboratory of Silicon Materials Department of Materials Science and Engineering Zhejiang University Hangzhou 310027 China

Quaternary alloys Mg2Sn0.4Si0.6-xGex （x=0, 0.02, 0.05, 0.08 0.1, and 0.2） were prepared using induction melting followed by hot-pressing. Relative densities of the sintered samples were over 97% of the theoretical values. Multiple phases were detected in the samples. It was found that the Seebeck coefficient was sensitive to the content of Mg2Ge and a maximum value of about 350 μV-K^-1 was obtained. The introduction of Ge increases the electrical conductivity and the thermal conductivity simultaneously. The mechanism of this phenomenon was discussed. A maximum dimensionless figure of merit, ZT, of about 0.28 was obtained for Mg2Sn0.4Si0.55Ge0.05 at 550 K.

关键词： thermoelectric materials hot-pressing thermal conductivity induction melting quaternary alloys