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Strengthening Soft 45# Steel Through a Crn/W-Dlc/Dlc Multilayer Coating

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SSRN 2024年

作者： Luo, Guoqiang Xu, Xinyu Dong, Haoran Wei, Qinqin Tian, Feng Qin, Jianglin Shen, Qiang Chaozhou Branch of Chemistry and Chemical Engineering Guangdong Laboratory Guangdong Chaozhou521000 China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Hubei Wuhan430070 China School of Materials Science and Engineering Wuhan University of Technology Hubei Wuhan430070 China Hubei Technology Innovation Center for Advanced Composites Wuhan University of Technology Hubei Wuhan430070 China State Owned Wuhan Xinyu Machine Factory Hubei Wuhan430060 China

Special equipment vehicles typically operate in complex environments, resulting in wear and failure of the chassis’s rotary seal shaft predominantly made of soft 45# steel. An effective strategy to extend the service life is to apply a hard coating on the working surface. However, previous research have primarily concentrated on the coating for hard high-speed steel, while the significant difference of physical characteristics between soft 45# steel and hard coating leads to a weak interface adhesion. This study produces a CrN/W-DLC/DLC multilayer coating on the soft 45# steel with strong interfacial adhesion and superior friction and wear property by tailoring the CrN transition layer thickness. The multilayer coating consists of five layers, a CrN transition layer, a Cr layer, a Cr/WC alternating layer, a W-DLC/DLC alternating layer, and the topmost DLC layer. Increasing the thickness of the transition layer improves the coating's hardness and adhesive strength. The 3CrN/W-DLC/DLC multilayer coating achieves the highest adhesive strength of 75N. The optimized CrN/W-DLC/DLC coating reduces the internal stress of the DLC coating and enhances its adhesion. Importantly, the average friction coefficient and wear cross-sectional area of the CrN/W-DLC/DLC multilayer coatings decrease accordingly. The 3CrN/W-DLC/DLC coating exhibits superior outstanding wear resistance evidenced by an average friction coefficient of 0.119 and a wear cross-sectional area of 100.55 μm2. A High proportion of sp2 bonds in the coating that are susceptible to graphitization and thicker transition layer that enhances the coating's support results in narrower wear traces. The oxidation wear and three-body abrasive wear as the main wear mechanisms. The work provides a significant promise for application in vehicle rotary seal components and a theoretical reference for improving the wear resistance of the seal surface. © 2024, The Authors. All rights reserved.

关键词： Hard coatings

Low Anisotropy and Excellent Energy Absorption of Additively Manufactured Porous Ti-6al-4v Alloy Consisting of Disordered Trapezo-Rhombic Dodecahedron Cell Structures

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SSRN 2024年

作者： Zhao, Rusheng Guo, Shiyue Zhang, Fan Zhang, Wen Yang, Dongsheng Yue, Xuezheng Guo, Xiangyu Tang, Huiling Liu, Yang Hubei Longzhong Laboratory Xiangyang441000 China Graduate School of Systems Design Tokyo Metropolitan University Tokyo1910065 Japan The State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China School of Mechanical Engineering Hunan University of Science and Technology Xiangtan411201 China School of Materials Science and Engineering University of Shanghai for Science and Technology Shanghai200082 China Wuhan University of Technology China

Additive manufacturing (AM) can fabricate porous metals with exceptional characteristics for lightweight structural applications and energy absorption. The mechanical properties of porous metals are determined by porosity, cell shape, cell size, and loading direction. In this study, porous Ti-6Al-4V samples with ordered and disordered cellular structures were manufactured using the laser powder bed fusion (L-PBF) process, and the anisotropic compression behavior under different regularities was systematically investigated. The results show that samples with ordered cellular structures exhibited higher compressive strength under z-axis compression but were prone to shear band formation under x- and y-axis compression, leading to a significant reduction in strength. As regularity decreased, shear bands gradually disappeared, and the samples exhibited more uniform plastic deformation. Notably, when the regularity coefficient R = 0.8, the samples showed the best overall mechanical performance in all directions, including the highest plastic collapse strength and energy absorption capacity. With decreasing regularity, the anisotropy of the porous structures also decreased. Additionally, when R = 0.4, the anisotropy of mechanical performance parameters was minimized;however, when R = 0.8, the overall performance of the mechanical parameters was optimal. These results indicate that effectively adjusting the regularity of the pore structure is key to achieving isotropy and optimizing overall mechanical performance. Compared to simply choosing ordered cells, adjusting the regularity of the cell structure can achieve excellent mechanical properties and reduce anisotropy, which is of significant value for lightweight structures and energy absorption applications. © 2024, The Authors. All rights reserved.

关键词： Anisotropy

Nanoceramic composites with duplex microstructure break the strength-toughness tradeoff

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Journal of Materials Science & technology 2020年第23期58卷 1-9页

作者： Ji Zou Hai-Bin Ma Jing-Jing Liu Wei-Min Wang Guo-Jun Zhang Zheng-Yi Fua State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China School of Metallurgy and Materials University of BirminghamB152TTBirminghamUK China Nuclear Power Technology Research Institute Shenzhen518026China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Institute of Functional MaterialsDonghua UniversityShanghai201620China

There is a strength and fracture toughness tradeoff in nanoceramic composite. The strength varies reciprocally with the grain size whereas the toughness contributed by compressive residual stress increases with the dimension of the second phase. In this work, a novel duplex microstructure with reinforced clusters composing of nanosized grains was proposed and validated using a model system of B_(4)C-TiB_(2) ceramics densified by carbide boronizing. As-obtained ceramics exhibit excellent combined mechanical properties at room temperature, including Vickers hardness, Young's modulus, flexural strength and fracture toughness(by surface crack in flexure method) of 32.1 ± 2.7 GPa, 506.9 ± 2.0 GPa,1175 ± 71 MPa and 5.1 ± 0.4 MPa m^(0.5), respectively. Both strength and toughness are at least ~30 % higher than the counterparts with similar composition but homogenously distributed TiB_(2) grains. Graphite onion was confirmed to be an intermediate product during reactive sintering, it facilitated the grain pullout during fracture and retained the nanometric TiB_(2) grain in the cluster, both of which also contribute the toughening and strengthening mechanisms in the B_(4)C-TiB_(2) ceramics.

关键词： Borides Microstructure In-situ reaction Mechanical properties Boron carbide Ceramics

Bifunctional Electrocatalyst Junction Engineering: Cop Nanoparticles In-Situ Anchored on Co3(Si2o5)2(Oh)2 Nanosheets for Highly Efficient Water Splitting

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SSRN 2022年

作者： Mu, Yang Dong, Xueying Jing, Xuyang Pei, Xiaoyu Zhao, Yunfeng Kou, Zongkui Meng, Changgong Zhang, Yifu State Key Laboratory of Fine Chemicals School of Chemical Engineering Dalian University of Technology Dalian116024 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China College of Environmental and Chemical Engineering Dalian University Dalian116622 China

The development of promising bifunctional water splitting electrocatalysts through precise design of composition and structure is a challenging topic. In this work, a novel junction is developed consisting of pure-phase CoP nanoparticles in-situ grown on Co3(Si2O5)2(OH)4 nanosheets, denoted as CoP/CSNSs. Rely on the small adding Co2+ in complex precursor, controllable synthesis of pure-phase CoP without impure phases is achieved, and the perfect nanosheet structure from support can be inherited, the CoP/CSNSs therefore shows the highest electrocatalytic performance for both HER and OER in 1.0 M KOH. Besides, the overall water splitting voltage of CoP/CSNSs(+/-) delivers 1.50 V at 10 mA cm-2, which outperforms that of the commercial Pt/C||RuO2 system. The preferable bifunctional electrocatalytic performance benefits from the optimized electron state of the adjacent dual-active centers, such that surficial CoP contributes to the dissociation of H-OH bonds boosting the Volmer step of HER, and Co3(Si2O5)2(OH)4 support contributes to OH- adsorption facilitating the kinetics of OER. Meanwhile, the advanced nanosheet structure provides more accessible active centers and more efficient charge/mass transport highway. In this work, bifunctional metal silicate electrocatalyst for water dissociation is designed and fabricated for the first time. The simple and effective phase-modulation and structure-control is a promising strategy for continually exploitation of multifunctional metal silicate electrocatalysts. Such low-cost and highly efficient electrocatalysts may create new opportunities for future development of renewable energy conversion technologies. © 2022, The Authors. All rights reserved.

关键词： Nanoparticles

Peridynamic stress is the static first Piola-Kirchhoff Virial stress

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arXiv

arXiv 2022年

作者： Li, Jun Li, Shaofan Lai, Xin Liu, Lisheng State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Department of Civil and Environmental Engineering University of California BerkeleyCA94720 United States Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics Wuhan University of Technology Wuhan430070 China

The peridynamic stress formula proposed by Lehoucq and Silling [1, 2] is cumbersome to be implemented in numerical computations. Here, we show that the peridynamic stress tensor has the exact mathematical expression as that of the first Piola-Kirchhoff static Virial stress originated from Irving-Kirkwood-Noll formalism [3, 4] through the Hardy-Murdoch procedure [5, 6], which offers a simple and clear expression for numerical calculations of peridynamic stress. Several numerical verifications have been carried out to validate the accuracy of proposed peridynamic stress formula in predicting the stress states in the vicinity of the crack tip and other sources of stress concentration. The peridynamic stress is evaluated within the bond-based peridynamics with prototype microelastic brittle (PMB) material model. It is found that the PMB material model may exhibit nonlinear constitutive behaviors at large deformations. The stress fields calculated through the proposed peridynamic stress formula show good agreements with finite element analysis results, analytical solutions, and experimental data, demonstrating the promising potential of derived peridynamic stress formula in simulating the stress states of problems with discontinuities, especially in the bond-based peridynamics. Copyright © 2022, The Authors. All rights reserved.

关键词： Continuum mechanics

In Situ Polysaccharide Based Double-Network Hydrogels as a Sustained Kartogenin Delivery System for Cartilage Tissue Engineering

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SSRN 2024年

作者： Fan, Yaohui Yan, Junyi Zhao, Xinxin Wang, Wenyuan Gao, Chihao Lin, Xiaoli Wang, Yu Cheng, Bo Yang, Jing Li, Binbin Wang, Xinyu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Hainan Institute Wuhan University of Technology Sanya572000 China Foshan Xianhu Laboratory of the Advanced Energy Science Technology Guangdong Laboratory Xianhu hydrogen Valley Foshan528200 China Biomedical Materials and Engineering Research Center of Hubei Province Wuhan University of Technology Wuhan430070 China School of Foreign Languages Wuhan University of Technology Wuhan430070 China Department of Stomatology Zhongnan Hospital of Wuhan University Wuhan430060 China

In-situ forming, biodegradable hydrogel scaffolds are crucial in tissue engineering and drug delivery, and are widely used in articular cartilage (AC) repair. Hydrogels derived from polysaccharides are ideal materials for cartilage tissue engineering due to the similar components and structure between them and cartilage extracellular matrix (ECM). Here, we fabricated a double-network (DN) hydrogel composed of glycidyl methacrylate (GMA)-modified chitosan (GCS) and hyaluronic acid methacrylate with aldehyde groups (AHM) via Schiff base reaction and photocrosslinking. The drug-loaded hydrogel was formed by grafting the bioactive factor kartogenin (KGN) onto GCS (KGCS) and then gelation. Compared with the traditional hydrogels encapsulating the drug or drug combined with microspheres, it has stable and sustained release effect, the drug release ratio is lower and persistent. In addition, the physical and chemical properties of the two kinds of hydrogels with or without KGN were studied, including morphology, mechanical properties, swelling rate and in vitro degradation behavior. In order to examine the biocompatibility, BMSCs were encapsulated in hydrogels. The results showed that both hydrogels could provide an appropriate microenvironment and could promote the growth and proliferation of BMSCs, but the KGCS/AHM hydrogel was better. In summary, we prepared a KGN-conjugated polysaccharide DN hydrogel, which had a sustained and slowly release effect on KGN and supported cell growth and proliferation, with the potential for cartilage tissue engineering. © 2024, The Authors. All rights reserved.

关键词： Biocompatibility

Carbon decorated Li_(3)V_(2)(PO_(4))_(3) for high-rate lithium-ion batteries:Electrochemical performance and charge compensation mechanism

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Journal of Energy Chemistry 2021年第2期30卷 124-131,I0005页

作者： Manling Ding Chen Cheng Qiulong Wei Yue Hu Yingying Yan Kehua Dai Jing Mao Jinghua Guo Liang Zhang Liqiang Maig Institute of Functional Nano&Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials&1 DevicesSoochow UniversitySuzhou 215123JiangsuChina Department of Materials Science and Engineering Fujian Key Laboratory of Materials GenomeCollege of MaterialsXiamen UniversityXiamen 361005FujianChina College of Chemistry Tianjin Normal UniversityTianjin 300387China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001HenanChina Advanced Light Source Lawrence Berkeley National LaboratoryBerkeleyCA 94720United States Department of Chemistry and Biochemistry University of CaliforniaSanta CruzCA 95064United States State Key Laboratory of Advanced Technology for Materials Synthesis and Processing International School of Materials Science and EngineeringWuhan University of Technology.Wuhan 430070HubeiChina

Fast charging and high-power delivering batteries are highly demanded in mobile electronics,electric vehicles and grid energy storage,but there are full of *** star-material Li_(3)V_(2)(PO_(4))_(3) is demonstrated as a promising high-rate cathode material meeting the above ***,we report the carbon decorated Li_(3)V_(2)(PO_(4))_(3) (LVP/C) cathode prepared via a facile method,which displays a remarkable high-rate capability and long-term cycling ***,the prepared LVP/C delivers a high discharge capacity of 122 mAh g^(-1)(-93% of the theoretical capacity) at a high rate up to 20 C and a superior capacity retention of 87.1% after 1000 ***,by applying a combination of X-ray absorption spectroscopy and full-range mapping of resonant inelastic X-ray scattering,we clearly elucidate the structural and chemical evolutions of LVP upon various potentials and cycle *** show unambiguous spectroscopic evidences that the evolution of the hybridization strength between V and O in LVP/C as a consequence of lithiation/delithiation is highly reversible both in the bulk and on the surface during the discharge-charge processes even over extended cycles,which should be responsible for the remarkable electrochemical performance of LVP/*** present study provides not only an effective synthesis strategy but also deeper insights into the surface and bulk electrochemical reaction mechanism of LVP,which should be beneficial for the further design of high-performance LVP electrode materials.

关键词： Lithium-ion batteries Li_(3)V_(2)(PO_(4))_(3) Charge compensation mechanism X-ray absorption spectroscopy Resonant inelastic X-ray scattering

Effects of Alumina Modification on Curing Performance of Ceria-Stabilized Zirconia in Stereolithography

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SSRN 2024年

作者： Li, Zhi Wu, Jiaxin Luo, Jing Zhang, Bowen Li, Yue Cheng, Bo Yang, Jing Li, Binbin Wang, Xinyu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu hydrogen Valley Foshan528200 China Sanya Science and Education Innovation Park Wuhan University of Technology Sanya572000 China Biomedical Materials and Engineering Research Center of Hubei Province Wuhan University of Technology Wuhan430070 China School of Foreign Languages Wuhan University of Technology Wuhan430070 China Department of Stomatology Zhongnan Hospital of Wuhan University Wuhan430060 China

Ceria-stabilized zirconia has promising applications in the field of dental materials due to its mechanical and anti-aging properties. However, the fabrication of high-quality ceria-stabilized zirconia ceramics by stereolithography remains a significant challenge owing to the optical properties of ceria. This work aimed to overcome the lack of photopolymerization performance by utilizing alumina sol encapsulated in ceria-stabilized zirconia particles and generating an alumina layer in the ceria-stabilized zirconia particles through heat treatment, with the objective of reducing the absorbance of the ceria-stabilized zirconia slurry. The results indicated a reduction in the absorbance of the modified powder at 405 nm, decreasing from 0.2113 to 0.1384. Additionally, the Vickers hardness, elasticity moduli, flexural strength, and fracture toughness of the Al2O3/CeZrO2 ceramics were observed to be 10.43 ± 0.74 GPa, 231.5 ± 4.2 GPa, 701 ± 89 MPa and 9.74 ± 0.61 MPa·m1/2, respectively. The percentage of monoclinic phases and mechanical properties exhibited minimal variation before and after accelerated low-temperature degradation tests. This study illustrates that ceria-stabilized zirconia modified by alumina sols demonstrate favorable mechanical properties and LTD resistance. The findings may serve as a basis for optimizing the preparation of ceria-stabilized zirconia dental materials via stereolithography. © 2024, The Authors. All rights reserved.

关键词： Fracture toughness

Zn-doping enhances the photoluminescence and stability of PbS quantum dots for in vivo high-resolution imaging in the NIR-II window

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Nano Research 2020年第8期13卷 2239-2245页

作者： Xiulei Shi Song Chen Meng-Yao Luo Biao Huang Guozhen Zhang Ran Cui Mingxi Zhang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology430070WuhanChina Key Laboratory of Analytical Chemistry for Biology and Medicine(Ministry of Education) College of Chemistry and Molecular SciencesWuhan UniversityWuhan430072China iChEM(Collaborative Innovation Center of Chemistry for Energy Materials) Hefei National Laboratory for Physical Science at the MicroscaleUniversity of Science and Technology of ChinaHefei230026China

Lead sulfide(PbS)quantum dots(QDs)are important near infrared(NIR)luminescent materials with tunable and strong emission covering a broad NIR ***,their optical properties are quite sensitive to air,water,and high temperature due to the surface oxidation,thus limiting their applications in optoelectronic devices and biological ***,a cation-doping strategy is presented to make a series of high-quality Zn-doped PbS QDs with strong emission covering whole second near-infrared window(NIR-II,1,000-1,700 nm).First-principle calculations confirmed that Zn dopants formed dopant states and decreased the recombination energy gap of host ***,the Zn dopants significantly improved the quantum yield,photoluminescence lifetime and thermal stability of PbS ***,the PEGylated Zn-doped PbS QDs emitting in the NIR-llb window(1,500-1,700 nm)realized the noninvasive imaging of cerebral vascular of mouse with high resolution,being able to distinguish blood *** material not only provides a new tool for deep tissue fluorescence imaging,but is also promising for the development of other NIR related devices.

关键词： quantum dots doping second near-infrared window(NIR-II window) tunable emission in vivo imaging