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BN/SiBCN light-leakage-proof coatings of silica optical fiber for long term sensors at high temperatures

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Chinese Journal of Aeronautics 2021年第5期34卷 93-102页

作者： Xin’gang LUAN Xinming XU Rong YU Qiqi zhang sam zhang Laifei CHENG Science and Technology on Thermo Structural Composite Materials Laboratory Northwestern Poly technical UniversityXian 710072China Faculty of Materials and Energy Southwest UniversityChong Qing 400715China

SiBCN and BN/SiBCN light-leakage-proof coatings were prepared on silica optical fibers for sensing applications at high *** electron microscopy was used to characterize the surface morphology and microstructure of the coated *** and optical properties of the coated fiber were characterized by Raman,optical and tensile *** with the original fiber,the tensile strength of Si BCN and BN/Si BCN coated fiber show an increase of about 60%and 90%at room temperature,*** addition,the tensile strength of BN/Si BCN coated silica optical fiber was increased by about 42%at 700°*** has been found that the improvement of the strength of BN/Si BCN coated silica optical fiber is related to the healing of defects and residual compressive stress in *** the light transmittance performance of the coated fiber,it was found that BN/Si BCN double coating could be an ideal total reflection solution to protect silica optical fiber from light leakage during high temperature sensing operation.

关键词： BN/SiBCN double coating High temperature Optical fiber Sensor Silica

Mechanical size effect of eutectic high entropy alloy:Effect of lamellar orientation

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Journal of Materials Science & Technology 2021年第23期82卷 10-20页

作者： Yujie Chen Xianghai An sam zhang Feng Fang Wenyi Huo Paul Munroe Zonghan Xie Centre for Advanced Thin Films and Devices School of Materials and EnergySouthwest UniversityChongqing 400715China School of Mechanical Engineering The University of AdelaideAdelaideSA 5005Australia School of Aerospace Mechanical and Mechatronic EngineeringThe University of SydneySydneyNSW 2006Australia Jiangsu Key Laboratory of Advanced Metallic Materials Southeast UniversityNanjing 211189China School of Materials Science and Engineering University of New South WalesSydneyNSW 2052Australia

The effect of lamellar orientation on the deformation behavior of eutectic high entropy alloy at the micrometer scale,and the roles of two rarely explored laminate orientations(i.e.,the lamellar orientation at~0°and 45°angles with the loading direction)in regulating size-dependent plasticity were investigated using in-situ micropillar compression *** alloy,CoCrFe NiTa_(0.395),consists of alternating layers of Laves and FCC *** was found that the yield stress of the 0°pillars scaled inversely with the pillar diameters,in which the underlying deformation mode was observed to transform from pillar kinking or buckling to shear banding as the diameter *** the case of the 450 pillars with diameters ranging from 0.4 to 3μm,there exists a’weakest’diameter of~1μm,at which both constraint effect and dislocation starvation are *** of the lamellar orientations,the strain hardening rate decreased with decreasing pillar diameter due to the diminishing dislocation accumulation that originated from the softening nature of large shear bands in the 0°pillars,and the enhanced probability of dislocation annihilation at the increased free surfaces in the 45°*** findings expand and deepen the understanding of the mechanical size effect in small-scale crystalline materials and,in so doing,provide a critical dimension for the development of high-performing materials used for nanoor microelectromechanical systems.

关键词： High-entropy alloy Eutectic structure Orientation dependence Mechanical size effect In-situ micropillar testing

Novel dye-sensitized solar cell architecture using TiO2-coated Ag nanowires array as photoanode

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Rare Metals 2019年第4期38卷 316-320页

作者： Ming Wang sam zhang Zhao-Fu Du Li-Dong Sun Dong-Liang Zhao Department of Functional Material Research Central Iron and Steel Research Institute Beijing 100081 China School of Mechanical and Aerospace Engineering Nanyang Technological University Singapore 639789 Singapore

With the aim of reducing series resistance and increasing dye loading,novel dye-sensitized solar cell architecture was designed with TiO2 nanoparticle-coated Ag nanowires array as the *** nanowire array was prepared by anodic aluminum oxide (AAO) templateassisted electrochemical deposition ***,Ag nanowires were coated by TiO2 nanoparticles in hydrothermal *** structures of the photoanode were characterized by field emission scanning electron microscopy (FESEM).Ag nanowires are covered by a layer of very fine nanoparticles with a diameter of less than 5 nm.X-ray diffraction (XRD) and selected-area electron diffraction (SAED) show that Ag nanowires have a strong preferred orientation in (220) direction and the TiO2 coating layer is a polycrystalline *** this photoanode,3.2 % conversion efficiency is achieved for the cell sensitized with N3 dye.

关键词： Dye-sensitized solar cell Nano wires array Photoanode Anodic aluminum oxide

More on Stability issues in Perovskite solar cells

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More on Stability issues in Perovskite solar cells

薄膜微桥拉伸法基体梯度裂纹的制备及其稳态扩展

第三届全国太阳能电池材料与器件大会

作者： sam zhang President of Thin Films society and Professor of Southwest University

Recent years has seen much progress in the development of perovskite solar cells especially in increasing conversion efficiency. However without stability no matter how efficient it is, it is never going to be commercially viable. This talk focuses on stability issues concerning perovskite solar cells. The stability issues comes from intrinsic and extrinsic two aspects. Molecular dissociation and ion migrations constitute the intrinsic aspect. The extrinsic factors many concerning the environmental effect, which include moisture,oxygen, and temperature. This talk tries to illustrate how these factors affect cells and their performance, and possible measures to take.

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来源： cnki会议评论

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中国表面工程 2021年第3期34卷 130-138页

作者：张晓民冯杰李金刚孙德恩 zhang sam 西安建筑科技大学材料科学与工程学院西安710055 重庆大学材料科学与工程学院重庆400030 西南大学材料与能源学院重庆400715

16 mm×32 mm单晶硅片基体紧凑拉伸测试样品上尖锐裂纹的可控制备,及其在拉伸载荷作用下的稳态扩展,是微桥法薄膜断裂韧性测试得以实现的关键。相较于紫外激光切割,采用红外激光切割方法在基体背面制备出锯齿状的背槽,并通过控制位移加... 详细信息

16 mm×32 mm单晶硅片基体紧凑拉伸测试样品上尖锐裂纹的可控制备,及其在拉伸载荷作用下的稳态扩展,是微桥法薄膜断裂韧性测试得以实现的关键。相较于紫外激光切割,采用红外激光切割方法在基体背面制备出锯齿状的背槽,并通过控制位移加载步幅和球形压头均衡加载,实现了三点弯曲法基体尖锐裂纹的可控制备。该基体裂纹具有梯度形貌特征,对加载过程中的"载荷-位移"曲线以及表面裂纹扩展过程进行了考察,揭示了梯度形貌对裂纹失稳扩展的抑制作用。基体尖锐裂纹的可控制备及其在拉伸测试中的稳态扩展,为微桥法的标准化测试奠定了基础。

关键词：激光切割锯齿状背槽梯度裂纹稳态扩展

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元素掺杂类金刚石碳膜降内应力研究综述

表面技术 2018年第6期47卷 95-103页

作者：孙德恩董洪铭 sam zhang 张晓民重庆大学材料科学与工程学院重庆400030 重庆大学机械传动国家重点实验室重庆400030 西南大学材料与能源学部重庆400715 西安建筑科技大学材料与矿资学院西安710055

我国汽车行业与国际同行的差距主要在于发动机关键零部件的摩擦磨损。类金刚石(DLC)碳膜技术是解决发动机关键零部件摩擦磨损问题的有效途径,但传统的DLC碳膜在制备过程中会产生较高的内应力(可达10GPa),从而导致薄膜失效。首先分析了DL... 详细信息

我国汽车行业与国际同行的差距主要在于发动机关键零部件的摩擦磨损。类金刚石(DLC)碳膜技术是解决发动机关键零部件摩擦磨损问题的有效途径,但传统的DLC碳膜在制备过程中会产生较高的内应力(可达10GPa),从而导致薄膜失效。首先分析了DLC碳膜在汽车零部件领域的应用背景,探讨了薄膜内应力的来源,重点综述了异质元素掺杂降低类金刚石碳膜内应力的研究现状。常用掺杂元素按化学性质可分为碳化物形成元素与非碳化物形成元素,不同于其他分类方法,笔者按掺杂元素的组元多少进行划分,从单元掺杂、二元或多元掺杂入手,系统分析了各种掺杂方式、掺杂元素的优缺点。在此基础上,指出元素掺杂降低类金刚石碳膜内应力的研究从最初的单一元素掺杂,逐步发展到了二元或多元元素掺杂;从碳化物形成元素掺杂、非碳化物形成元素掺杂,逐步发展到碳化物形成元素与非碳化物形成元素的多元共掺杂;所研究的类金刚石碳膜的显微结构也从最初的非晶态结构向多元、多相结构发展,以期获得良好的综合机械性能。

关键词：内应力元素掺杂类金刚石碳膜纳米复合薄膜摩擦学性能

Synergistic effect between Er-doped MoS_(2)nanosheets and interfacial Mo-N coupling phases for enhanced electrocatalytic hydrogen evolution

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Rare Metals 2024年第3期43卷 1301-1308页

作者： Nian-Peng Li Lei zhang Hua zhang Fan-Fei Min Lei Wang sam Toan Xi-Jun Liu Guang-Zhi Hu State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines School of Materials Science and EngineeringAnhui University of Science and TechnologyHuainan232001China Donghai Laboratory Zhoushan316021China Department of Chemical Engineering University of Minnesota-DuluthDuluthMN55812USA School of Ecology and Environmental Science Institute for Ecological Research and Pollution Control of Plateau LakesYunnan UniversityKunming650504China 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 UniversityNanning530004China

Hydrogen production via electrochemical water splitting is a promising and green *** one of the most representative transition metal sulfides layered materials,Molybdenum disulfide(MoS_(2))has immense potential for the hydrogen evolution reaction(HER).We successfully prepared a nitrogen-doped carbon(NC)in situ-grown erbium-doped MoS_(2)polyhedral structure(Er-MoS_(2)/NC)that incorporates an interfacial Mo-N coupling phase.

关键词： hydrogen interfacial coupling

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硬质陶瓷涂层增韧及其评估研究进展

中国表面工程 2016年第2期29卷 1-9页

作者：裴晨蕊孙德恩 sam zhang 黄佳木赵岩高阳重庆大学材料科学与工程学院重庆400044 Nanyang Technological University Singapore 639798

硬质陶瓷涂层一般硬度高,但韧性差,在受到较大外加冲击荷载作用时容易产生裂纹并引发失效,从而限制了硬质涂层在工程领域的应用。硬质涂层的增韧研究是当前硬质涂层研究的热点之一。常见硬质涂层增韧方法中,有些是以降低硬度为代价来提... 详细信息

硬质陶瓷涂层一般硬度高,但韧性差,在受到较大外加冲击荷载作用时容易产生裂纹并引发失效,从而限制了硬质涂层在工程领域的应用。硬质涂层的增韧研究是当前硬质涂层研究的热点之一。常见硬质涂层增韧方法中,有些是以降低硬度为代价来提高涂层韧性,比如第二相增韧;有些是通过优化涂层结构设计,减小缺陷尺寸,在不损失涂层高硬度的前提下,提高韧性,获得兼具高硬度和高韧性的涂层;有些是通过相变(晶体结构转变)提高涂层的韧性。通过优化涂层结构设计,改变涂层晶粒尺寸、晶界尺寸与复杂程度等,使涂层致密化,从而提高涂层硬度与韧性,从而获得增韧效果,成为研究者越来越关注的焦点。单一增韧方法的局限性,可以通过多种增韧方法协同作用获得突破,协同增韧已成为硬质涂层增韧发展的趋势。目前硬质涂层的韧性评估还没有一个公认的方法,从简单实用出发,常用的有微悬臂梁弯曲法、划痕法和压痕法。

关键词：韧性硬度多层膜结构硬质涂层

Size-dependent deformation behavior of dual-phase,nanostructured CrCoNi medium-entropy alloy

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Science China Materials 2021年第1期64卷 209-222页

作者： Yujie Chen Xianghai An Zhifeng Zhou Paul Munroe sam zhang Xiaozhou Liao Zonghan Xie Centre for Advanced Thin Films and Devices School of Materials and EnergySouthwest UniversityChongqing400715China School of Mechanical Engineering The University of AdelaideAdelaideSA5005Australia School of Aerospace Mechanical and Mechatronic EngineeringThe University of SydneySydneyNSW2006Australia Department of Mechanical Engineering City University of Hong KongKowloonHong KongChina School of Materials Science and Engineering The University of New South WalesSydneyNSW2052Australia School of Engineering Edith Cowan UniversityPerthWA6027Australia

The mechanical size effect of nanostructured,dual-phase CrCoNi medium-entropy alloy(MEA)was investigated by combining in-situ micro-compression testing with post-mortem electron microscopy *** alloy possesses a superior yield strength up to~4 GPa,primarily due to its hierarchical microstructure including column nanograins,preferred orientation,a high density of planar defects and the presence of the hexagonal close packed(HCP)*** the yield strength of the alloy has shown sizeindependency,the deformation behaviour was strongly dependent on the sample ***,with decreasing the pillar diameters,the dominant deformation mode changed from highly localized and catastrophic shear banding to apparently homogeneous deformation with appreciable *** transition is believed to be governed by the sizedependent critical stress required for a shear band traversing the pillar and mediated by the competition between shearinduced softening and subsequent hardening *** addition,an unexpected phase transformation from HCP to face-centered cubic(FCC)was observed in the highly localized deformation zones,leading to strain softening that contributed to accommodating *** findings provide insights into the criticality of sample dimensions in influencing mechanical behaviors of nanostructured metallic materials used for nanoelectromechanical systems.

关键词： medium-entropy alloy size effect shear banding phase transformation nanostructure