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International Journal of Minerals,Metallurgy and Materials 2024年第7期31卷 1651-1658页

作者： Peixiong Zhang enhui wang Jingjing Liu Tao Yang Hailong wang Xinmei Hou Institute for Carbon Neutrality University of Science and Technology BeijingBeijing 100083China Liaoning Academy of Materials Shenyang 110000China Technical Support Center for Prevention and Control of Disastrous Accidents in Metal Smelting University of Science and Technology BeijingBeijing 100083China School of Materials Science Engineering Zhengzhou UniversityZhengzhou 450001China

Thermal insulation materials play an increasingly important role in protecting mechanical parts functioning at high *** this study,a new porous high-entropy(La_(1/6)Ce_(1/6)Pr_(1/6)Sm_(1/6)Eu_(1/6)Gd_(1/6))PO_(4)(HE(6RE_(1/6))PO_(4))ceramics was prepared by combining the high-entropy method with the pore-forming agent method and the effect of different starch contents(0–60vol%)on this ceramic properties was systematically *** results show that the porous HE(6RE_(1/6))PO_(4)ceramics with 60vol%starch exhibit the lowest thermal conductivity of 0.061 W·m^(-1)·K^(-1)at room temperature and good pore structure stability with a linear shrinkage of approximately1.67%.Moreover,the effect of large regular spherical pores(>10μm)on its thermal insulation performance was discussed,and an optimal thermal conductivity prediction model was *** superior properties of the prepared porous HE(6RE_(1/6))PO_(4)ceramics allow them to be promising insulation materials in the future.

关键词： porous high-entropy(La_(1/6)Ce_(1/6)Pr_(1/6)Sm_(1/6)Eu_(1/6)Gd_(1/6))PO_(4) ceramics high-entropy strategy pore-forming agent method thermal insulation material thermal conductivity

Mild fabrication of SiC/C nanosheets with prolonged cycling stability as supercapacitor

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Journal of Materials Science & Technology 2022年第15期110卷 178-186页

作者： Shuang Liu enhui wang Shichun Liu Chunyu Guo Hailong wang Tao Yang Xinmei Hou Beijing Advanced Innovation Center for Materials Genome Engineering Collaborative Innovation Center of Steel TechnologyUniversity of Science and Technology BeijingBeijing 100083China School of Materials Science Engineering Zhengzhou UniversityZhengzhou 450001China

A facile and mild route to synthesize C-coated SiC nanosheets(SiC/C NSs)via wet-chemical etching in hydrofluoric acid(HF)at 60°C for 48 h using carbon aluminum silicate(Al_(4)SiC_(4))as raw materials is reported for the first *** molecule leads to the breaking of C-Al bonds in Al_(4)SiC_(4),which eventually results in the formation of two-dimensional SiC nanosheets.A carbon layer with a thickness of approximately 1.5 nm is formed on the surface of SiC nanosheets due to the excess *** prepared SiC/C NSs possess a smooth and rectangular sheet with a mean 150 nm in width,500 nm in length and10 nm in thickness,*** crystallographic characterization indicates that 3C-SiC and 2H-SiC coexist and the parallel plane relationship of 3C/2H-SiC heterojunction is(111)_(3C-SiC)//(001)_(2H-SiC).Due to the formed 3C-SiC/2H-SiC heterojunction and graphitic carbon,the fabricated electrode based on SiC/C NSs exhibits prolonged cycling stability and high specific areal capacitance as a promising supercapacitor *** remains 91.2%retention even after 20,000 cycles and 734μF/cm^(2)at a scan rate of 10 m V/s.

关键词： SiC/C nanosheets Al_(4)SiC_(4) Etching Supercapacitors Stability

Competitive oxidation behavior of Ni-based superalloy GH4738 at extreme temperature

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International Journal of Minerals,Metallurgy and Materials 2024年第1期31卷 138-145页

作者： Hui Xu Shufeng Yang enhui wang Yunsong Liu Chunyu Guo Xinmei Hou Yanling Zhang State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China Institute for carbon neutrality University of Science and Technology BeijingBeijing 100083China

A high thrust-to-weight ratio poses challenges to the high-temperature performance of Ni-based superalloys. The oxidation behavior of GH4738 at extreme temperatures has been investigated by isothermal and non-isothermal experiments. As a result of the competitive diffusion of alloying elements, the oxide scale included an outermost porous oxide layer (OOL), an inner relatively dense oxide layer (IOL), and an internal oxide zone (IOZ), depending on the temperature and time. A high temperature led to the formation of large voids at the IOL/IOZ interface. At 1200℃, the continuity of the Cr-rich oxide layer in the IOL was destroyed, and thus, spallation occurred. Extension of oxidation time contributed to the size of Al-rich oxide particles with the increase in the IOZ. Based on this finding,the oxidation kinetics of GH4738 was discussed, and the corresponding oxidation behavior at 900-1100℃ was predicted.

关键词： Ni-based superalloy GH4738 extreme temperature competitive oxidation oxidation mechanism oxidation kinetics

Synthesis of CA_(6)/AlON composite with enhanced slag resistance

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International Journal of Minerals,Metallurgy and Materials 2023年第4期30卷 756-765页

作者： Yunsong Liu enhui wang Linchao Xu Tao Yang Zhijun He Tongxiang Liang Xinmei Hou Beijing Advanced Innovation Center for Materials Genome Engineering Collaborative Innovation Center of Steel TechnologyUniversity of Science and Tech-nology BeijingBeijing 10083China School of Materials and Metallurgy University of Science and Technology LiaoningAnshan 114051China School of Materials Science and Engineering Jiangxi University of Science and TechnologyGanzhou 341000China

Different amounts of AlON have been introduced in calcium hexaaluminate(CA_(6)) using two approaches, that is, one-step and twostep methods, to improve the slag resistance of CA_(6). A one-step method can directly sinter the mixtures combining Al_(2)O_(3), CaCO_(3), and Al in flowing nitrogen, in which AlON clusters are always formed because of the poor wettability of Al by Al_(2)O_(3), leading to the high porosity of CA_(6)/AlON composite. In a two-step method, CA_(6)and AlON are prepared separately and then mixed and sintered in flowing nitrogen. Compared with the sample prepared by the one-step method, CA_(6)and AlON in composite by the two-step method are more uniformly distributed,and the optimized amount of AlON added is 10wt%. The slag corrosion and penetration test shows that the CA_(6)/AlON composite using the two-step method exhibits superior slag corrosion protection. The promoted effect of AlON on slag penetration and corrosion resistance is also discussed.

关键词： CA_(6)/AlON composite two-step method wettability slag resistance

PVDF/6H-SiC composite fiber films with enhanced piezoelectric performance by interfacial engineering for diversified applications

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Journal of Materials Science & Technology 2024年第3期170卷 238-245页

作者： Linlin Zhou Tao Yang Chunyu Guo Kang wang enhui wang Laipan Zhu Hailong wang Sheng Cao Kuo-Chih Chou Xinmei Hou Institute for Carbon Neutrality University of Science and Technology BeijingBeijing 100083China Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of SciencesBeijing 101400China School of Materials Science Engineering Zhengzhou UniversityZhengzhou 450001China State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures Guangxi UniversityNanning 530004China

Piezoelectric silicon carbide(SiC)has been quite attractive due to its superior chemical and physical properties as well as wide potential ***,the inherent brittleness and unsatisfactory piezoelectric response of piezoelectric semiconductors remain the major obstacles to their diversified ***,flexible multifunctional PVDF/6H-SiC composite fiber films are fabricated and utilized to assemble both piezoelectric nanogenerators(PENGs)and stress/temperature/light *** open cir-cuit voltage(V_(oc))and the density of short circuit current(I_(sc))of the PENG based on the PVDF/5 wt%6H-SiC composite fiber films reach 28.94 V and 0.24μA cm^(-2),showing a significant improvement of 240%and 300%compared with that based on the pure PVDF *** effect of 6H-SiC nanoparticles(NPs)on inducing interfacial polarization and stress concentration in composite fiber films is proved by first-principles calculation and finite element *** stress/temperature/light sensors based on the composite fiber film also show high sensitivity to the corresponding *** study shows that the PVDF/6H-SiC composite fiber film is a promising candidate for assembling high-performance energy harvesters and diverse sensors.

关键词： 6H-SiC PVDF Multifunctional composite fiber film Energy harvester Stress/temperature/light sensor

In situ reduced MXene/AuNPs composite toward enhanced charging/discharging and specific capacitance

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Journal of Advanced Ceramics 2021年第5期10卷 1061-1071页

作者： Zixiang ZHENG Wei WU Tao YANG enhui wang Zhentao DU Xinmei HOU Tongxiang LIANG Hailong wang Beijing Advanced Innovation Center for Materials Genome Engineering Collaborative Innovation Center of Steel TechnologyUniversity of Science and Technology BeijingBeijing 100083China MOE Key Laboratory of New Processing Technology for Non-ferrous Metals and Materials Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured MaterialsGuangxi UniversityNanning 530004China School of Materials Science and Engineering Jiangxi University of Science and TechnologyGanzhou 341000China School of Materials Science Engineering Zhengzhou UniversityZhengzhou 450001China

In this work,gold nanoparticles(AuNPs)decorated Ti_(3)C_(2)T_(x) nanosheets(MXene/AuNPs composite)are fabricated through a self-reduction reaction of Ti_(3)C_(2)T_(x) nanosheets with HAuCl_(4) aqueous *** obtained composite is characterized as AuNPs with the diameter of about 23 nm uniformly dispersing on nanosheets without *** composite(MXene decorated on 4.8 wt% AuNPs)is further employed to construct supercapacitor for the first time with a higher specific capacitance of 278 F·g^(-1) at 5 mV·s^(-1) than that of pure Ti_(3)C_(2)T_(x) and 95% of cyclic stability after 10,000 ***,MXene/AuNPs composite symmetric supercapacitor with filter paper as separator and H_(2)SO_(4) as electrolyte,is *** supercapacitor exhibits a high volumetric energy density of 8.82 Wh·L^(-1) at a power density of 264.6 W·L^(-1) and ultrafast-charging/discharging *** exhibits as a promising candidate applied in integrated and flexible supercapacitors.

关键词： supercapacitors MXene gold nanoparticles(AuNPs) self-reduction composite

Effect of heat treatment temperature of the glaze lager on the structure and the formaldehyde removal performance of an interior wall tile

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International Journal of Minerals,Metallurgy and Materials 2022年第11期29卷 2079-2085页

作者： Ruqin Gao Yingrui Huang enhui wang Xinmei Hou Lu Pan Guoting Li Bingtao Liu School of Environmental Science and Engineering North China University of Water Resources and Electric PowerZhengzhou 450046China Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing 100083China

With the improvement of people’s living standards,a large number of petroleum products,daily necessities and decorations that can produce volatile organic compounds are used in decoration,which seriously affects the indoor air *** decoration materials have become a research hotspot in recent *** purpose of this paper is to develop a kind of interior wall material with good indoor formaldehyde removal effect,easily using,and low *** this paper,combining different heat treatment temperatures of the glaze layer,tourmaline/diatomite-based interior wall tiles were prepared by ultrafine grinding,solid sintering,and low temperature *** glaze layer under different heat treatment temperatures was characterized by thermogravimetric-differential thermal analysis,X-ray diffraction,and scanning electron *** influences of heat treatment temperature on the microscopic morphology and structure of the glaze layer were *** formaldehyde as the target degradation product,the effects of tourmaline/diatomite-based interior wall tiles on the removal of formaldehyde under different heat treatment temperatures of the glaze layer were *** results showed that with the increase in heat treatment temperature,the original pores of diatomite decreased,the specific surface area decreased,and the structure of tourmaline *** 850℃,the surface structure of the material was slightly damaged,the strength was increased,and the removal effect of formaldehyde was *** a 1 m^(3) environmental chamber,the formaldehyde removal rate reached 73.6%in 300 *** the temperature was increased to 950℃ and above,diatomite and the structure of tourmaline were destroyed,and the ability of the material to adsorb and degrade formaldehyde decreased.

关键词： diatomite tourmaline/diatomite-based interior wall tiles glaze layer heat treatment temperature formaldehyde adsorption and degradation

New design concept for stableα-silicon nitride based on the initial oxidation evolution at the atomic and molecular levels

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Journal of Materials Science & Technology 2022年第27期122卷 156-164页

作者： Chunyu Guo enhui wang Zhi Fang Yapeng Zheng Tao Yang Zhijun He Xinmei Hou Beijing Advanced Innovation Center for Materials Genome Engineering Collaborative Innovation Center of Steel TechnologyUniversity of Science and Technology BeijingBeijing 100083China The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081China School of Materials and Metallurgy University of Science and Technology LiaoningAnshan 114051China

As the dominated composition of Si_(3)N_(4)ceramics,α-silicon nitride(α-Si_(3)N_(4))can satisfy the strength and fracture toughness demand in the ***,α-Si_(3)N_(4)is oxygen-sensitive at high temperatures,which limits its high-temperature *** improve the oxidation resistance ofα-Si_(3)N_(4)ceramics,it is necessary to shed light on the oxidation ***,the initial oxidation ofα-Si_(3)N_(4)was systematically studied at the atomic and molecular *** density functional theory(DFT)calculation denotes that the(001)surface ofα-Si_(3)N_(4)has the best stability at both room temperature and high ***,the oxidation process of theα-Si_(3)N_(4)(001)surface consists of O adsorption and N desorption,and the consequent formation of nitrogen-vacancy(VN)is the key step for further ***,the molecular dynamics(MD)simulation indicates that the oxidation rate ofα-Si_(3)N_(4)(100)surface is slower than that ofα-Si_(3)N_(4)(001)surface due to the lower N concentration at the outermost ***,the oxidation resistance ofα-Si_(3)N_(4)can be improved by regulating the(100)surface as the dominant exposure *** addition,reducing the concentration of N on the final exposed surface ofα-Si_(3)N_(4)by mean of constructing the homojunction of the Si-terminal(100)surface and other N-containing surfaces(such as(001)surface)should be also a feasible approach.

关键词： α-Si_(3)N_(4) Surface oxidation Nitrogen vacancy DFT MD

Bifunctional hierarchical NiCoP@FeNi LDH nanosheet array electrocatalyst for industrial-scale high-current-density water splitting

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Journal of Materials Science & Technology 2023年第28期159卷 33-40页

作者： Liming Yang Tao Yang enhui wang Xiangtao Yu Kang wang Zhentao Du Sheng Cao Kuo-Chih Chou Xinmei Hou Institute for Carbon Neutrality University of Science and Technology BeijingBeijing 100083China MOE Key Laboratory of New Processing Technology for Non-ferrous Metals and Materials Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured MaterialsGuangxi UniversityNanning 530004China

Aiming to design and prepare non-noble metal electrocatalysts for hydrogen production at high current density(HCD),NiCoP@FeNi LDH hierarchical nanosheets were deposited on nickel foam progressively us-ing a hydrothermal-phosphorization-electrodeposition *** hydrogen evolution reaction(HER)and oxygen evolution reaction(OER),NiCoP@FeNi LDH/NF requires only 195 and 230 mV overpotentials to reach 1000 mA cm−2,*** overall water splitting,only 1.70 V is required at 1000 mA cm−*** is the largest value for non-noble metal-based electrocatalysts reported so far at *** hierarchi-cal structure exhibits good electron transport capability and the porous-macroporous structure enhances the gas release rate,resulting in enhanced hydrogen production at ***,the synergistic effect of NiCoP and FeNi LDH contributes to the adsorption-desorption equilibrium of intermediate radicals dur-ing the reaction process and ultimately enhances the catalytic *** work provides useful direction for industrial-scale hydrogen production applications at HCD.

关键词： High-current-density Overall water splitting Hydrogen evolution reaction Oxygen evolution reaction

Maximizing the mechanical performance of Ti_(3)AlC_(2)-based MAX phases with aid of machine learning

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Journal of Advanced Ceramics 2022年第8期11卷 1307-1318页

作者： Xingjun DUAN Zhi FANG Tao YANG Chunyu GUO Zhongkang HAN Debalaya SARKER Xinmei HOU enhui wang Beijing Advanced Innovation Center for Materials Genome Engineering Collaborative Innovation Center of Steel TechnologyUniversity of Science and Technology BeijingBeijing 100083China Fritz-Haber-Institut der Max-Planck-Gesellschaft Faradayweg 4-6Berlin 14195Germany UGC-DAE Consortium for Scientific Research University CampusKhandwa RoadIndore 452001India

Mechanical properties consisting of the bulk modulus,shear modulus,Young’s modulus,Poisson’s ratio,etc.,are key factors in determining the practical applications of MAX *** mechanical properties are mainly dependent on the strength of M–X and M–A *** this study,a novel strategy based on the crystal graph convolution neural network(CGCNN)model has been successfully employed to tune these mechanical properties of Ti_(3)AlC_(2)-based MAX phases via the A-site substitution(Ti_(3)(Al1-xAx)C_(2)).The structure–property correlation between the A-site substitution and mechanical properties of Ti_(3)(Al1-xAx)C_(2)is *** results show that the thermodynamic stability of Ti_(3)(Al1-xAx)C_(2)is enhanced with substitutions A=Ga,Si,Sn,Ge,Te,As,or *** stiffness of Ti_(3)AlC_(2)increases with the substitution concentration of Si or As increasing,and the higher thermal shock resistance is closely associated with the substitution of Sn or *** addition,the plasticity of Ti_(3)AlC_(2)can be greatly improved when As,Sn,or Ge is used as a *** findings and understandings demonstrated herein can provide universal guidance for the individual synthesis of high-performance MAX phases for various applications.

关键词： Ti_(3)(Al1−xAx)C_(2) crystal graph convolution neural network(CGCNN)model stability mechanical properties