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电弧离子镀Al-Cr-O/Zr-O+NiCoCrAlSiY和Al-Cr-O+NiCoCrAlSiY涂层的抗氧化性和隔热性能

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Transactions of Nonferrous Metals Society of China 2024年第4期34卷 1237-1250页

作者：鲜丽君赵海波范洪远鲜广四川大学机械工程学院成都610065 四川大学分析测试中心成都610065

采用电弧离子镀在高温合金表面沉积Al-Cr-O/Zr-O多层涂层和Al-Cr-O单层涂层+NiCoCrAlSiY结合层,并在1000~1200℃下进行热处理。利用扫描电子显微镜和X射线衍射仪分析涂层的显微组织和物相结构。结果表明,Al-Cr-O/Zr-O多层涂层和Al-Cr-O... 详细信息

采用电弧离子镀在高温合金表面沉积Al-Cr-O/Zr-O多层涂层和Al-Cr-O单层涂层+NiCoCrAlSiY结合层,并在1000~1200℃下进行热处理。利用扫描电子显微镜和X射线衍射仪分析涂层的显微组织和物相结构。结果表明,Al-Cr-O/Zr-O多层涂层和Al-Cr-O单层涂层均呈现出致密的球形结构。热处理后,Al-Cr-O/Zr-O涂层表面出现裂纹,且裂纹随着温度的升高而增多和变粗。然而,Al-Cr-O涂层经热处理后其表面胞状结构转变为紧密连接的粒状结构,并且随着热处理温度的升高,粒状结构显著长大。由于作为氧离子导体以及t-ZrO_(2)的致密度低于α-Al_(2)O_(3),Al-Cr-O/Zr-O涂层中的t-ZrO_(2)为氧离子向涂层内扩散提供了通道,因此,Al-Cr-O单层涂层+NiCoCrAlSiY涂层体系的高温抗氧化性优于Al-Cr-O/Zr-O多层涂层+NiCoCrAlSiY涂层体系。但是,由于更大的陶瓷涂层厚度,t-ZrO_(2)相的低热导率以及层间界面的热反射作用,Al-Cr-O/Zr-O多层涂层+NiCoCrAlSiY涂层体系的隔热性能优于Al-Cr-O单层涂层+NiCoCrAlSiY涂层体系。

关键词：电弧离子镀 Al-Cr-O/Zr-O多层涂层抗氧化性隔热性能

SnO_2-Decorated Graphene/Polyaniline Nanocomposite for a High-Performance Supercapacitor Electrode

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Journal of Materials Science & Technology 2015年第11期31卷 1101-1107页

作者： Guo Chen Qiu-Feng Lü hai-bo zhao College of Materials Science and Engineering Fuzhou University

An SnO2-decorated graphene/polyaniline （GSP） nanocomposite with homogeneous structure was prepared and adopted to achieve high electrochemical performance for supercapacitor electrode. Graphene sheets were decorated with tin dioxide （SnO2） particles, which effectively hinder the restacking of graphene nanosheets, and then were used as substrates for an in-situ polymerization of aniline monomers. The GSP nanocomposite was characterized by field emission scanning electron microscopy, X-ray diffraction, Fourier transform infrared, UV-Visible and X-ray photoelectron spectroscopy. The results revealed that polyaniline nanorods were orderly and vertically aligned on the SnO2-decorated graphene nanosheets via π-π stacking effect between basal planes of graphene nanosheets and phenyl group of polyaniline. The GSP nanocomposite exhibited an excellent specific capacitance of 429 F g^-1 at a current density of 1 A g^-1, excellent cycling stability and rate capability, which suggested a promising application for supercapacitor.

关键词： Supercapacitor Graphene Nanocomposite Tin dioxide Polyaniline

Multifunctional protective aerogel with superelasticity over−196 to 500℃

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Nano Research 2022年第9期15卷 7797-7805页

作者： bo-Wen Liu Min Cao Yi-Ying Zhang Yu-Zhong Wang hai-bo zhao The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials(MoE) National Engineering Laboratory of Eco-Friendly Polymeric Materials(Sichuan)State Key Laboratory of Polymer Materials EngineeringCollege of ChemistrySichuan UniversityChengdu 610064China

Protective materials that possess superelasticity and multifunctionality over a broad temperature range are urgently needed in various advanced ***,under harsh work conditions,the performance of current materials may largely deteriorate to lose protective ***,we report a bidirectionally oriented multi-walled carbon nanotubes(MWCNTs)-reinforced chitosan carbon aerogel(CS-MWCNT)that possesses superelasticity,high electromagnetic interference shielding,thermal insulation,and infrared stealth at both low temperatures(such as liquid nitrogen)and high temperatures(such as alcohol flames).Highly oriented lamellar arch structures combined with an MWCNTs-reinforced carbon skeleton act as elastic segments to disperse the stress during compression and endow CS-MWCNT with the ability to recover to almost the original size after being compressed at−196-500℃.The lamellar structures make CS-MWCNT thermally insulating and infrared stealth with a low thermal conductivity of~0.03 W/(m·K).Furthermore,a high electromagnetic interference(EMI)shielding effect of 64 dB is realized via an absorption-dominant EMI shielding mechanism derived from the successive inherently conductive carbon lamella,and the EMI shielding performance is largely maintained after treatment under extreme conditions like low temperature,high temperature,as well as cyclic *** work provides a new strategy for the development of temperature-invariant multifunctional aerogels for harsh environment applications.

关键词： superelasticity electromagnetic interference shielding heat insulation infrared stealth extreme environment

Structure and mechanical properties of Zr/TiAlN films prepared by plasma-enhanced magnetron sputtering

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Rare Metals 2015年第10期34卷 717-724页

作者： Guang Xian hai-bo zhao Hong-Yuan Fan Hao Du School of Manufacture Science and Engineering Sichuan University The Analysis and Testing Centre Sichuan University

The purpose of this study was to investigate the effects of Zr interlayer on the structure and mechanical properties of TiAlN films, which were deposited on the M2 high-speed steel substrates by means of plasma-enhanced magnetron sputtering. The result shows that the crystal orientation of Zr/TiAlN films is similar to that of single-layered TiAlN films, but the difference is that AlN(111) of Zr/TiAlN films disappears completely. With respect to Zr interlayer, the texture coefficient of Zr/TiAlN films is approximately 1. Zr/TiAlN films exhibit a compact isometric structure, which is distinctly different from the columnar structure existing in the single-layered TiAlN films and Ti/TiAlN films. The hardness and H3/E*2 of Zr/TiAlN films are, respectively, enhanced to be 36.6 GPa and 0.147. With a few cracks emerging around the indention, the adhesion strength of TiAlN films is obviously advanced by adding Zr metal interlayer.

关键词： TiAlN films Structure Orientation Hardness Adhesio

Hierarchical Ti_(3)C_(2)T_(x)@ ZnO Hollow Spheres with Excellent Microwave Absorption Inspired by the Visual Phenomenon of Eyeless Urchins

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Nano-Micro Letters 2022年第5期14卷 62-76页

作者： Yan‑Qin Wang hai‑bo zhao Jin‑bo Cheng bo‑Wen Liu Qiang Fu Yu‑Zhong Wang Collaborative Innovation Center for Eco‑Friendly and Fire‑Safety Polymeric Materials(MoE) State Key Laboratory of Polymer Materials EngineeringNational Engineering Laboratory for Eco‑Friendly Polymer Materials(Sichuan)College of ChemistrySichuan UniversityChengdu 610064People’s Republic of China College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu 610065People’s Republic of China

Ingenious microstructure design and rational composition selection are effective approaches to realize high-performance microwave absorbers,and the advancement of biomimetic manufacturing provides a new *** nature,urchins are the animals without eyes but can“see”,because their special structure composed of regular spines and spherical photosensitive bodies“amplifies”the light-receiving ***,inspired by the above phenomenon,the biomimetic urchin-like Ti_(3)C_(2)T_(x)@ZnO hollow microspheres are rationally designed and fabricated,in which ZnO nanoarrays(length:~2.3μm,diameter:~100 nm)as the urchin spines are evenly grafted onto the surface of the Ti_(3)C_(2)T_(x) hollow spheres(diameter:~4.2μm)as the urchin spherical photosensitive *** construction of gradient impedance and hierarchical heterostructures enhance the attenuation of incident electromagnetic *** the EMW loss behavior is further revealed by limited integral simulation calculations,which fully highlights the advantages of the urchin-like *** a result,the Ti_(3)C_(2)T_(x)@ZnO hollow spheres deliver a strong reflection loss of−57.4 dB and broad effective absorption bandwidth of 6.56 GHz,superior to similar *** work provides a new biomimetic strategy for the design and manufacturing of advanced microwave absorbers.

关键词： Bioinspired Hierarchical heterostructures Ti_(3)C_(2)T_(x)MXene ZnO nanoarrays Microwave absorption

Porous carbon/Fe composites from waste fabric for high-efficiency electromagnetic wave absorption

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Journal of Materials Science & Technology 2022年第31期126卷 266-274页

作者： Jin-bo Cheng hai-bo zhao Ai-Ning Zhang Yan-Qin Wang Yu-Zhong Wang Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials(MoE) State Key Laboratory of Polymer Materials EngineeringNational Engineering Laboratory for Eco-Friendly Polymer Materials(Sichuan)College of ChemistrySichuan UniversityChengdu 610064China

Nowadays,a large amount of waste fabrics has brought huge environmental and resource problems,while the traditional recycling routes are downcycling with low efficiency and complex separation ***,we demonstrate a green and facile route to up-recycle waste fabrics(cotton-polyester blending or cotton fabrics)into a high-performance microwave *** this design,an assistant coating was deposited onto the fiber surface of the waste fabric through the assembly of tannic acid-Fe^(2+)(TA-Fe^(2+)),which effectively catalyzed the polymer fiber into highly graphitized porous carbon fiber at high ***,the Fe nanoparticles from the reduction of Fe^(2+)ions were evenly embedded on the surface of porous carbon ***,the resultant porous carbon/Fe composites with hierarchi-cal microstructures displayed excellent microwave absorption ***,the microwave ab-sorber from waste polyester-cotton blended fabric could reach a minimum reflection loss(RL)of-50.5 dB at a thin coating thickness of 1.7 mm,and the minimum RL from waste cotton fabric absorber reached-47.1 dB at a thickness of 2.5 *** work provides a new idea to convert waste fabrics into high value-added microwave absorbing materials in a simple and environmentally friendly way,which will help reuse resources and protect the environment.

关键词： Up recycling Microwave absorption Waste fabrics Thin thickness

Hydrothermal alteration processes in the giant Dahutang tungsten deposit, South China: Implications from litho-geochemistry and mass balance calculation

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China Geology 2021年第2期4卷 230-244页

作者： hai-bo zhao Yong Zhang Lei Liu Zhengzhou Institute of Multipurpose Utilization of Mineral Resources Chinese Academy of Geological SciencesZhengzhou 450006China State Key Laboratory of Nuclear Resources and Environment East China University of TechnologyNanchang 330013China Institute of Geological Survey of East China University of Technology Nanchang 330013China Northwest China Center for Geoscience Innovation Xi’an 710054China

The giant Dahutang tungsten(W)deposit has a total reserve of more than 1.31 Mt ***-disseminated scheelite and vein type wolframite mineralization are developed in this deposit,which are related to Late Mesozoic biotite *** major types of alterations,which include albitization,potassic-alteration,and greisenization,and overprinted silicification developed in contact *** mass balance calculate of the four alteration types were used to further understanding of the mineralization *** fresh porphyritic biotite granite has high Nb,Ta,and W,but low Ca and Sr while the Jiuling granodiorite has high Ca and Sr,but low Nb,Ta,and W *** altered porphyritic biotite granite indicated that the Nb,Ta,and W were leached out from the fresh porphyritic biotite granite,especially by sodic *** low Ca and Sr contents of the altered Neoproterozoic Jiuling granodiorite indicate that Ca and Sr had been leached out from the fresh granodiorite by the fluid from Mesozoic porphyritic biotite *** metal W of the Dahutang deposit was mainly derived from the fluid exsolution from the melt and alteration of W-bearing *** study of alteration presents a new hydrothermal circulation model to understand tungsten mineralization in the Dahutang deposit.

关键词： Tungsten deposit Geochemistry Alteration Mass balance calculation Hydrothermal circulation Dahutang Mineral exploration engineering Jiangnan Orogenic Belt South China

An Effective Green Porous Structural Adhesive for Thermal Insulating,Flame-Retardant,and Smoke-Suppressant Expandable Polystyrene Foam

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Engineering 2022年第10期17卷 151-160页

作者： Meng-En Li hai-bo zhao Jin-bo Cheng Ting Wang Teng Fu Ai-Ning Zhang Yu-Zhong Wang The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials(MoE)&State Key Laboratory of Polymer Materials Engineering&National Engineering Laboratory of Eco-Friendly Polymeric Materials(Sichuan) College of ChemistrySichuan UniversityChengdu 610064China

To develop an efficient way to overcome the contradiction among flame retardancy,smoke suppression,and thermal insulation in expanded polystyrene(EPS)foams,which are widely used insulation materials in buildings,a novel"green"porous bio-based flame-retard ant starch(FRS)coating was designed from starch modified with phytic acid(PA)that simultaneously acts as both a flame retardant and an *** porous FRS coating has open pores,which,in combination with the closed cells formed by EPS beads,create a hierarchically porous structure in FRS-EPS that results in superior thermal insulation with a lower thermal conductivity of 27.0 mW·(m·K)^(-1).The resultant FRS-EPS foam showed extremely low heat-release rates and smoke-production release,indicating excellent fire retardancy and smoke *** specific optical density was as low as 121,which was 80.6%lower than that of neat EPS,at *** FRS-EPS also exhibited self-extinguishing behavior in vertical burning tests and had a high limiting oxygen index(LOI)value of 35.5%.More interestingly,after being burnt with an alcohol lamp for 30 min,the top side temperature of the FRS-EPS remained at only 140℃with ignition,thereby exhibiting excellent fire *** analysis confirmed the intumescent action of FRS,which forms a compact phosphorus-rich hybrid barrier,and the phosphorus-containing compounds that formed in the gas phase contributed to the excellent flame retardancy and smoke suppression of *** novel porous biomass-based FRS system provides a promising strategy for fabricating polymer foams with excellent flame retardancy,smoke suppression,and thermal insulation.

关键词： Biomass porous coating Expanded polystyrene foam Low thermal conductivity Flame retardancy Smoke suppression

Effect of annealing temperature on the microstructure and optoelectrical properties of ZnO thin films and their application in self-powered accelerometers

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International Journal of Minerals,Metallurgy and Materials 2019年第9期26卷 1186-1193页

作者： Xiao-zhou Zhang Yan-ping Xia Xing Liu Yi-ming Zhong hai-bo zhao Pei-hong Wang School of Physics & Materials Science Anhui University

This paper reports a piezoelectric nanogenerator(NG) with a thickness of approximately 80 μm for miniaturized self-powered acceleration sensors. To deposit the piezoelectric zinc oxide(ZnO) thin film, a magnetron sputtering machine was used. Polymethyl methacrylate(PMMA) and aluminum-doped zinc oxide(AZO) were used as the insulating layer and the top electrode of the NG, respectively. The experimental results show that the ZnO thin films annealed at 150℃ exhibited the highest crystallinity among the prepared films and an optical band gap of 3.24 eV. The NG fabricated with an AZO/PMMA/ZnO/stainless steel configuration exhibited a higher output voltage than the device with an AZO/ZnO/PMMA/stainless steel configuration. In addition, the annealing temperature affected the open-circuit voltage of the NGs;the output voltage reached 3.81 V when the annealing temperature was 150℃. The open-circuit voltage of the prepared self-powered accelerometer increased linearly with acceleration. In addition, the small NG-based accelerometer, which exhibited excellent fatigue resistance, can be used for acceleration measurements of small and lightweight devices.

关键词： piezoelectric ZnO thin film RF magnetron sputtering annealing temperature accelerometer