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Effects of alloying elements on thermal conductivity of pearlitic gray cast iron

Journal of Iron and Steel Research International 2019年第9期26卷 1022-1030页

作者： Gui-quan Wang Xiang Chen Yan-xiang Li Yuan Liu Hua-wei Zhang Zhong-li Liu School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China School of Nuclear Equipment and Nuclear Engineering Yantai UniversityYantai 264005ShandongChina Key Laboratory for Advanced Materials Processing Technology Tsinghua UniversityBeijing 100084China

A quantitative model is proposed to describe the thermal conductivity of alloyed pearlitic gray cast iron. The model is built by combining the computational thermodynamics and effective medium theory. The volume fractions and concentrations of precipitated phases in as-cast structure are estimated in consideration of partial and para-equilibrium. The conductivity of alloyed ferrite is calculated, taking into account the electronic and vibrational contributions of alloying elements. The model provides a good agreement with microstructure analysis and measured thermal conductivity. The influence of common alloying elements was discussed from the viewpoint of precipitation of phases and scattering of alloying atoms. This model can also be used as a numerical tool for designing the pearlitic gray cast irons with high thermal conductivity and high tensile strength.

关键词： Thermal conductivity Thermodynamic model Gray cast iron Alloying element

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Enhancing emission performance of red TADF emitters via the introduction of electronically inert pendant

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Organic Electronics 2024年 126卷

作者： Tang, Yukun He, Jian-Li Zhang, Kai Zhao, Yue Lin, Yu-Ching Chen, Chia-Hsun Chiu, Tien-Lung Lee, Jiun-Haw Wang, Chuan-Kui Fan, Jian Wu, Chung-Chih Department of Electrical Engineering Graduate Institute of Electronics Engineering and Graduate Institute of Photonics and Optoelectronics National Taiwan University Taipei 10617 Taiwan Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices Soochow University Jiangsu Suzhou215123 China Shandong Province Key Laboratory of Medical Physics and Image Processing Technology School of Physics and Electronics Shandong Normal University Jinan250014 China Coordination Chemistry Institute State Key Laboratory of Coordination Chemistry School of Chemistry and Chemical Engineering Nanjing National Laboratory of Microstructures Nanjing University Nanjing210023 China Department of Chemistry National Taiwan University Taipei10617 Taiwan Department of Electrical Engineering Yuan Ze University Taoyuan32003 Taiwan Graduate Institute of Photonics and Optoelectronics and Department of Electrical Engineering National Taiwan University Taipei10617 Taiwan State Key Laboratory of Structural Chemistry Fujian Institute of Research on Structure of Matter Chinese Academy of Sciences Fujian Fuzhou35002 China

In addition to emission efficiency and colors, emission characteristics such as preferentially horizontal emitting dipole orientation and resistance against concentration quenching are also highly desired for high-performance thermally activated delayed fluorescence (TADF) emitters. In this work, we report a simple and yet effective strategy for enhancing such emission performance of the pure red-to-near infrared (NIR) TADF emitter by introducing bulky aryl derivatives (m-xylene) to the efficient emission core. Incorporating m-xylene groups as the electronically inert pendants to the acceptor unit of the TADF emitter TPA–CN–N4-CH3 successfully retains favorable emission properties (e.g., pure red color chromaticity, nearly unitary photoluminescence quantum yield etc.) of the parent compound TPA–CN–N4 and yet also renders significantly higher horizontal emitting dipole ratio Θ// of ∼85 % with the more extended molecular configuration and reduced concentration quenching at very high concentrations in thin films. As a result, OLEDs adopting TPA–CN–N4-CH3 can demonstrate rather high EQEs of 29.8–32.1 % for pure red emission (625–650 nm) at low doping concentrations and decent EQEs of 18.9–27.5 % in the deep red to NIR range (650–700 nm) at higher doping concentrations. The results of this work shall provide a useful reference for development of efficient TADF emitters. © 2024 Elsevier B.V.

关键词： Fluorescence

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Congruent melting of tungsten phosphide at 5 GPa and 3200℃ for growing its large single crystals

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Chinese Physics B 2020年第8期29卷 501-506页

作者： Xiao-Jun Xiang Guo-Zhu Song Xue-Feng Zhou Hao Liang Yue Xu Shi-Jun Qin Jun-Pu Wang Fang Hong Jian-Hong Dai Bo-Wen Zhou Wen-Jia Liang Yun-Yu Yin Yu-Sheng Zhao Fang Peng Xiao-Hui Yu Shan-Min Wang Institute of Atomic and Molecular Physics Sichuan UniversityChengdu 610065China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Department of Physics Southern University of Science and Technology(SUST)Shenzhen 518055China School of Physics University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Material Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

As one of important members of refractory materials,tungsten phosphide(WP)holds great potential for fundamental study and industrial applications in many fields of science and technology,due to its excellent properties such as superconductivity and as-predicted topological band ***,synthesis of high-quality WP crystals is still a challenge by using tradition synthetic methods,because the synthesis temperature for growing its large crystals is very stringently required to be as high as 3000℃,which is far beyond the temperature capability of most laboratory-based devices for crystal *** addition,high temperature often induces the decomposition of metal phosphides,leading to off-stoichiometric samples based on which the materials'intrinsic properties cannot be *** this work,we report a high-pressure synthesis of single-crystal WP through a direct crystallization from cooling the congruent W-P melts at 5 GPa and^3200℃.In combination of x-ray diffraction,electron microscope,and thermal analysis,the crystal structure,morphology,and stability of recovered sample are well *** final product is phase-pure and nearly stoichiometric WP in a single-crystal form with a large grain size,in excess of one millimeter,thus making it feasible to implement most experimental measurements,especially,for the case where a large crystal is *** in synthesis of high-quality WP crystals at high pressure can offer great opportunities for determining their intrinsic properties and also making more efforts to study the family of transition-metal phosphides.

关键词： congruent melting tungsten phosphide single crystals high pressure and high temperature

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Effect of Gd addition on mechanical and microstructural properties of Mg-xGd-2.6Nd-0.5Zn-0.5Zr cast alloys

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China Foundry 2020年第3期17卷 212-218页

作者： Liang Zhan Yi-zhi Le Zhi-jun Feng Yan-chun Lou Ming Ruan Hua-wen Li Key Lab of Electromagnetic Processing of Materials Northeastern UniversityShenyang 110819China State Key Laboratory of Light Alloy Casting Technology for High-end Equipment Shenyang Research Institute of Foundry Co.Ltd.Shenyang 110022China AECC Zhongchuan Transmission Machinery Co. Ltd.Changsha 410200China

The Mg-xGd-2.6Nd-0.5Zn-0.5Zr(x=0,3.0,4.5 and 6.0,wt.%)alloys were prepared by gravity casting and then T6 *** of the alloy were observed using optical microscopy and scanning electron *** show that the as-cast alloys contained network Mg3Gd phases,blocky and needle-like Mg12(Nd,Gd)*** a(Zr)particle inclusions in the a(Mg)matrix are also *** of the secondary phases decreases as Gd content *** test results show that the tensile and yield strengths of all the alloys increase as Gd content increases under the as-cast and T6 conditions,but the elongation exhibits the opposite *** blocky Mg12(Nd,Gd)phases appear and act as crack initiator and deteriorates the experimental alloys’ductility with the increase of Gd content,especially as Gd content increases to 6.0 wt.%,so the Mg-6.0Gd-2.6Nd-0.5Zn-0.5Zr alloy has the lowest elongation value compared to the other alloys *** T6 treatment,the Mg-4.5Gd-2.6Nd-0.5Zn-0.5Zr alloy exhibits the optimal mechanical properties both at room temperature and 250℃.

关键词： Mg-xGd-Nd-Zn-Zr alloys mechanical properties microstructure Gd addition

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Effect of Si and Ti addition on the tribological behavior of aged Cu–15Ni–8Sn alloys

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Tribology International 2025年 211卷

作者： Li, Daoxi Zhao, Chao Zhong, Rui Dong, Haokai Wang, Zhi Luo, Zongqiang Zhang, Weiwen College of Mechanical and Energy Engineering Shaoyang University Shaoyang 422000 China School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China Guangdong Key Laboratory for Processing and Forming of Advanced Metallic Materials South China University of Technology Guangzhou 510640 China School of Mechanical and Automotive Engineering South China University of Technology Guangzhou 510640 China State Key Laboratory of Advanced Marine Materials Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 China

A comparative study was conducted to evaluate the tribological properties of base alloy (Cu–15Ni–8Sn, wt.%) and Si–Ti-modified alloy (Cu–15Ni–8Sn–0.3Si–0.1Ti, wt.%). Both alloys were tested against 100Cr6 steel under dry sliding conditions at various loads using a block-on-ring tester. Scanning electron microscopy and transmission electron microscopy revealed that the Si–Ti-modified alloy exhibits a refined grain structure with reduced discontinuous precipitation, significantly enhancing plasticity while improving tribological performance. The addition of trace amounts of Si and Ti stabilizes key sub-tribo-layers (oxide layer and mechanically mixed layer) and promotes a transition from abrasive/adhesive wear to oxidative wear. Consequently, the modified alloy shows lower friction coefficients and specific wear rates compared to the base alloy, demonstrating superior anti-friction and wear-resistance properties under these conditions. © 2025

关键词： Cu–15Ni–8Sn alloy Dry sliding wear Tribo-layers Wear mechanism

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Directly Prepared Al-Doped Femoo4 materials from Spent Hydrogenation Catalysts Via a Low-Temperature Green Process

SSRN

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SSRN 2023年

作者： Wang, Xueli Zhang, Songyang Wang, Haifeng Tian, Maolin Feng, Erkang Cui, Jian Chen, Jian-An Wen, Jiawei Huang, Guoyong Xu, Shengming College of New Energy and Materials China University of Petroleum Beijing102249 China State Key Laboratory of Heavy Oil China University of Petroleum Beijing102249 China Research Institute of Petroleum Processing Co. Ltd. SINOPEC Beijing100083 China Institute of Nuclear and New Energy Technology Tsinghua University Beijing100084 China Beijing Key Lab of Fine Ceramics Tsinghua University Beijing100084 China

Environmental-friendly recovery of critical metals from solid wastes directly for new energy materials received lots of concerns. In this paper, the FeMoO4(FMO) materials for new energy storage materials are directly prepared from spent hydrogenation catalysts by "low temperature sodium roasting-water leaching" process. The leaching rates after roasting of main metal element Mo, Al and Ni from wastes are: 91.8%, 1.7% and 0.1%, respectively, then the leachate was directly generated Al-doped FMO materials (Mo/Al=50:1). As for the application of lithium ion battery anode, the specific capacity is 363.5 mAh/g after 200 cycles, 55% improvement compared with bare FMO. The tunable phase transformation by roasting temperature regulation is the core to achieve the selective water leaching of Mo. Finally, the economic evaluation of the whole process indicating promising economic benefits. This process provides an environmental technology route for the development of new energy industries under carbon neutrality goals. © 2023, The Authors. All rights reserved.

关键词： Environmental technology

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离子液体在盐包水电解质中化学混溶性研究及其在高压高温水系钾离子超级电容器的应用（英文）

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Science Bulletin 2025年第10期 1576-1580页

作者：陈健超张光浩张鸿张树贤李庆誉朱春艳满孝阁张志薇石元昌李涛韩野张梦起尹龙卫王儒涛 Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of EducationSchool of Materials Science and EngineeringShandong University College of Materials Science and Engineering Shandong University of Science and Technology Department of Materials Engineering Xuzhou College of Industrial Technology The 18th Research Institute of China Electronics Technology Group Corporation Key Laboratory of Advanced Energy Materials Chemistry Ministry of EducationNankai University Shandong Laboratory of Advanced Materials and Green Manufacturing at Yantai

Supercapacitors, also known as electrical double-layer capacitors(EDLCs), store and release electrical charge through the adsorption and desorption of ions on the surface of highly porous carbon materials [1]. To meet the increasing demands from electric vehicles, rail traffic, military and space applications, EDLCs are usually required to operate within a broad temperature range(subzero to 60 °C or more) [2].

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Aromatics Production from Relay Catalytic Pyrolysis of Cow Manure Using Ru/C and Zsm-5 Dual Catalysts synthesis from Coal Gasification Fine Slag

SSRN

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SSRN 2023年

作者： Wu, Ruofei Lv, Peng Liu, Bin Bai, Yonghui Wang, Jiaofei Wei, Juntao Su, Weiguang Xu, Guangyu Bao, Weina Yu, Guangsuo State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering School of Chemistry and Chemical Engineering Ningxia University Yinchuan750021 China Joint International Research Laboratory of Biomass Energy and Materials Co-Innovation Center of Efficient Processing Utilization of Forest Resources College of Materials Science and Engineering Nanjing Forestry University Nanjing210037 China Shandong Yankuangguotuo Science & Engineering Co. Ltd. Zoucheng273500 China Institute of Clean Coal Technology East China University of Science and Technology Shanghai200237 China

The resource utilization of solid waste can gradually substitute fossil fuels while achieving waste recycling. In this study, the residual carbon ash from the coal gasification fine slag (CGFS) was separated by froth flotation, and then prepared Ru/C and ZSM-5 catalysts with carbon-rich and ash-rich components as raw materials respectively. The performance of two catalysts for catalytic upgrading of volatiles from cow manure (CM) pyrolysis to produce light aromatic hydrocarbons was investigated. The direct pyrolysis products of CM are mainly alcohols, ketones, ethers and other oxygen-containing compounds. When ZSM-5 is used as the catalyst, the yield of monocyclic aromatic hydrocarbons (MAHs) is significantly increased, due to the better catalytic cracking and aromatization abilities of ZSM-5 catalyst. While the Phenols in the pyrolysis products were improved when Ru/C was added as the catalyst due to the cleavage effect of Ru/C on the C-O bond. When Ru/C and ZSM-5 were used for relay catalytic pyrolysis of volatiles, the increase in MAHs yield in the pyrolysis product was higher than the total increase under Ru/C and ZSM-5 single catalysis. The possible pathways for the generation of MAHs from CM under Ru/C and ZSM-5 relay catalytic pyrolysis was revealed by the model compounds pyrolysis experiment. © 2023, The Authors. All rights reserved.

关键词： Catalysts

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Improving the mechanical properties and thermal conductivity of mesophase-pitch-based carbon fibers by controlling the temperature in industrial spinning equipment

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Carbon 2024年 226卷

作者： Gao-ming Ye Kui Shi Huang Wu Dong Huang Chong Ye Ting Ouyang Shi-peng Zhu Zhen Fan Hong-bo Liu Jin-shui Liu College of Materials Science and Engineering Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology Hunan University Changsha 410082 China Hunan Province Engineering Research Center for High Performance Pitch-based Carbon Materials Hunan Toyi Carbon Material Technology Co. Ltd. Changsha 410000 China State Key Laboratory of Advanced Design and Manufacturing for vehicle body Hunan University Changsha 410082 China Key Laboratory of Advanced Functional Composite Materials Aerospace Research Institute of Materials and Processing Technology Beijing 100076 China

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Ultrafast Terahertz Probes of Charge Transfer and Recombination Pathway of CH_(3)NH_(3)PbI_(3) Perovskites

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Chinese Physics Letters 2018年第2期35卷 111-115页

作者： Hui-Jie Yan Zhi-Liang Ku Xue-Feng Hu Wan-Ying Zhao Min-Jian Zhong Qi-Biao Zhu Xian Lin Zuan-Ming Jin Guo-Hong Ma Department of Physics Shanghai UniversityShanghai 200444 State Key Laboratory of Advanced Technology For Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070

We use transient terahertz photoconductivity measurements to demonstrate that upon optical excitation of CH_(3)NH_(3)PbI_(3)perovskite,the hole transfer from CH_(3)NH_(3)PbI_(3)into the organic hole-transporting material(HTM)Spiro-OMe TAD occurs on a sub-picosecond ***-order recombination is the dominant decay pathway at higher photo-excitation fluences as observed in neat CH_(3)NH_(3)PbI_(3)*** contrast,under similar experimental conditions,second-order recombination weakly contributes the relatively slow recombination between the electrons in the perovskite and the injected holes in HTM,as a loss mechanism at the CH_(3)NH_(3)PbI_(3)/Spiro-OMe TAD *** results offer insights into the intrinsic photophysics of CH_(3)NH_(3)PbI_(3)-based perovskites with direct implications for photovoltaic devices and optoelectronic applications.

关键词： Perovskite

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