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Low shrinkage Cf/SiC composites by vat photopolymerization of polycarbosilane containing precursor slurry and PIP process

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Ceramics International 2025年

作者： Jin, Baojie Li, Shan Zheng, Xinqi Hu, Chuanqi Wang, Xuye Chen, Zihuan Duan, Wenyan Liu, Bingshan Cui, Congcong Li, Wei Zhang, Ge Wang, Gong Technology and Engineering Centre of Space Utilization Chinese Academy of Sciences Beijing100094 China School of Materials Science and Engineering University of Science and Technology Beijing Beijing100083 China Key Laboratory of Optical System Advanced Manufacturing Technology Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Sciences Changchun130033 China

Carbon fiber reinforced silicon carbide (Cf/SiC) composites were fabricated using vat photopolymerization (VPP) technology and precursor infiltration and pyrolysis (PIP) process. The photosensitive slurry was firstly prepared by blending SiC powder, mixed photosensitive resin and chopped carbon fiber. By introducing ceramic precursor vinyl hydropolycarbosilane (VHPCS) into the photosensitive slurry, the flexural strength of the green bodies was enhanced and the linear shrinkage of the debinding bodies was decreased. When the addition of VHPCS was 20 wt%, the flexural strength of the green bodies reached 37.37 MPa, and the linear shrinkage after debinding was 3.82%. Then the influence of different chopped carbon fiber content on various properties of Cf/SiC composites was investigated. When the carbon fiber content was 15 vol%, the flexural strength and bulk density, and porosity of the Cf/SiC composites measuring 190.20 ± 18.57 MPa, 2.40 ± 0.01 g/cm3, and 1.21 ± 0.08%, respectively. TEM and XRD confirmed the existence of C, 6H-SiC, and 3C-SiC in the matrix, where 6H-SiC exhibited crystalline characteristics and 3C-SiC exhibited amorphous characteristics. This work provides a new strategy for VPP additive manufactured Cf/SiC complex structure. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Bending strength

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Transparent and Extremely Stretchable Piezoelectric Device for Sensors and Energy Harvesters

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ACS Applied Materials and Interfaces 2025年第21期17卷 31499-31510页

作者： He, Jian Qian, Zihao Hu, Zhijun Guo, Mingyu State-Local Joint Engineering Laboratory for Novel Functional Polymer Materials Jiangsu Key Laboratory of Advanced Functional Polymer Materials Suzhou Key Laboratory of Macromolecular Design and Precision Synthesis College of Chemistry Chemical Engineering and Materials Science Soochow University Suzhou 215123 China Key Laboratory of Advanced Optical Manufacturing Technologies of Jiangsu Province Key Laboratory of Modern Optical Technologies of Education Ministry of China School of Optoelectronic Science and Engineering Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow University Suzhou 215123 China

Piezoelectric devices have garnered significant interests due to their dual functionality as both sensors and energy harvesters, as well as the rapid development in Internet of Things (IoT) and artificial intelligence (AI). However, the fabrication of stretchable and transparent piezoelectric devices remains a great challenge, largely due to the inherent crystalline nature of piezoelectric materials and electrodes. In this work, for the first time, we report the fabrication of a highly transparent and stretchable piezoelectric device based entirely on polyurethane-urea (PUU) elastomers/composites. Specifically, nano ZnO hybrid hydrophobic PUU serves as the elastic inner piezoelectric layer;conductive ionic liquid composite hydrophilic PUU forms the middle electrode layer;and hydrophobic PUU elastomer acts as the outer encapsulation layer. The obtained device exhibits exceptional stretchability (elongation at break >1000%) and excellent optical transparency (∼86%). It can generate distinct, stable, and reliable output signals for monitoring both small- and large-scale mechanical motions along with a mechanical energy output of 48 μW m^-2 at a pressure of 38.2 kPa, highlighting its outstanding sensing and energy harvesting capabilities. This work presents valuable new insights into the design and development of novel, reliable, transparent, and stretchable piezoelectric devices, paving the way for the new generation of flexible electronics. © 2025 American Chemical Society.

关键词： energy harvester nano ZnO piezoelectric device polyurethane urea transparent and stretchable sensor

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Effect of silica particle size on the viscosity, curing behavior, and sintering performance of silica/alumina ceramic suspensions for digital light processing-based vat photopolymerization

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Ceramics International 2025年

作者： Liu, Fei Xu, Qingzhi Qu, Jingjing Huang, Yuntao Ma, Jianping Lin, Lifu Guangxi Key Laboratory of Manufacturing System & Advanced Manufacturing Technology Guilin University of Electronic Technology Guilin541004 China School of Mechanical and Electrical Engineering Guilin University of Electronic Technology Guilin541004 China School of Mechanical and Electrical Engineering Guilin University of Aerospace Technology Guilin541004 China

This study systematically examined the effect of silica particle size on the viscosity, curing behavior, and sintering properties of silica/alumina ceramic suspensions. The suspension with 200 nm silica has a significantly higher viscosity than those with 500 nm and 1 μm silica. During digital light processing-based vat photopolymerization (VPP), the suspension with 200 nm silica exhibited the lowest cure depth and cure width. The sample's shrinkage and densification after sintering at different temperatures were also analyzed. At the same temperature, the silica particle size only weakly affected the shrinkage and densification. However, X-ray diffraction analysis of sintered samples revealed that a smaller particle size significantly facilitated the formation of the mullite phase. Finally, high-quality mullite ceramics with clear outlines were successfully prepared. This research provides an experimental foundation for the in-situ synthesis of complex mullite ceramic structures using VPP. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： X ray diffraction analysis

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pH-driven interfacial bond dynamics enable high-efficiency low-damage polishing of fused silica with CeO2 based slurries

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Journal of Materials Processing technology 2025年 341卷

作者： Li, Fukun Bai, Yang Hu, HaiXiang Qiao, Guanbo Li, Lingzhong Zhang, Feng Zhang, Xuejun Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Sciences Changchun130033 China University of Chinese Academy of Sciences Beijing100049 China State Key Laboratory of Advanced Manufacturing for Optical System Jilin Changchun130033 China

Achieving atomic-level surface integrity while maintaining a high material removal rate (MRR) remains a fundamental challenge in the polishing of fused silica due to its high hardness and brittleness. This study establishes a novel mechanistic framework for understanding how pH-driven interfacial bond dynamics govern chemo-mechanical polishing processes. By integrating multiscale experimental characterization (XPS, FTIR, Raman spectroscopy) with ReaxFF molecular dynamics simulations, we demonstrate for the first time that the dynamic equilibrium between the formation and rupture of Ce–O–Si interfacial bonds directly control removal efficiency and surface quality. Alkaline conditions enhance OH– activity, facilitating Si–O bond hydrolysis and stable Ce–O–Si linkage formation, resulting in the highest MRR (397.6 nm/min). Acidic environments promote citrate-mediated Ce3+ complexation and nanocluster dispersion, enabling a rolling mechanism that achieves ultra-smooth surfaces (Sq = 0.086 nm). In contrast, neutral pH conditions suffer from PEG adsorption blocking active sites, leading to a 62 % reduction in MRR relative to alkaline systems. A 12.2-fold increase in MRR compared to SiO2 abrasives (32.67 nm/min) confirms that chemical interfacial dynamics, rather than mechanical abrasion alone, are critical to material removal. This fundamental advancement provides a broadly generalizable theoretical basis for designing efficient, low-damage precision polishing processes across oxide-based optical materials and beyond. © 2025

关键词： Fused silica

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3D bioprinting of a dermal scaffold for full-thickness skin tissue regeneration

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Bio-Design and manufacturing 2025年第1期8卷 68-84,I0039-I0041页

作者： Lu Han Zixian Liu Meng Li Zhizhong Shen Jianming Wang Shengbo Sang Shanxi Key Laboratory of Micro Nano Sensors&Artificial Intelligence Perception College of Electronic Information and Optical EngineeringTaiyuan University of TechnologyTaiyuan 030024China Key Laboratory of Advanced Transducers and Intelligent Control System of the Ministry of Education Taiyuan University of TechnologyTaiyuan 030024China Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Taiyuan 030024China Shanxi Research Institute of 6D Artificial Intelligence Biomedical Science Taiyuan 030031China General Hospital of TISCO Taiyuan 030809China

Dermal substitutes have provided a template for the regeneration and reconstruction of the ***,the healed skin tissue often exhibits abnormal morphology and functionality,including scarring and *** this study,a composite bioink composed of methacrylated gelatin(GelMA)and chitosan oligosaccharide(COS)was proposed for printing a dermal scaffold using digital light processing(DLP)*** GelMA/COS bioink exhibited suitable porosity,swelling,degradation rate,and mechanical *** inclusion of COS demonstrated antibacterial effects against both Gram positive and Gram-negative bacteria,while simultaneously fostering the proliferation of human dermal fibroblasts(HDFs).Additionally,the application of COS could effectively reduce the expression levels of fibrosis-related genes,such as collagen I,collagen III,and fibronectin *** three-dimensionally printed cell-laden dermal scaffold exhibited excellent shape fidelity and high cellular viability,facilitating the extension of HDFs along the scaffold and the simultaneous secretion of extracellular matrix ***,the HDF-laden dermal scaffold transplanted into full-thickness skin defect sites in nude mice was shown to accelerate wound closure,reduce inflammation,and improve wound ***,the DLP-printed dermal scaffold provides an appealing approach for effectively treating full-thickness skin defects in clinical settings.

关键词： 3D printing Dermal scaffold Photo-cross-linking Skin tissue regeneration

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Lunar regolith simulant-derived 3D-printed geopolymers with optimized mechanical and thermal management properties

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Composites Part A: Applied Science and manufacturing 2025年 196卷

作者： Sun, Yifan Ma, Siqi Chen, Qingze Chen, Guoliang He, Peigang Wang, Yaming Qiu, Jun Jia, Dechang School of Energy Science and Engineering Key Laboratory of Aerospace Thermophysics Harbin Institute of Technology Harbin150001 China State Key Laboratory of Robotics and System Harbin Institute of Technology Harbin150001 China Institute for Advanced Ceramics Key Laboratory of Advanced Structure-Function Integrated Materials and Green Manufacturing Technology Harbin Institute of Technology Harbin150080 China Guangdong Provincial Key Laboratory of Mineral Physics and Materials Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou510460 China

Lunar soil, as an in-situ resource, holds significant potential for constructing bases and habitats on the Moon. However, such constructions face challenges including limited mechanical strength and extreme temperature fluctuations ranging from −170 °C to +133 °C between lunar day and night. In this study, we developed a 3D-printed geopolymer derived from lunar regolith simulant with an optimized zig-zag structure, exhibiting exceptional mechanical performance and thermal stability. The designed structure achieved remarkable damage tolerance, with a compressive strength exceeding 12.6 MPa at ∼ 80 vol% porosity and a fracture strain of 3.8 %. Finite element method (FEM) simulations revealed that the triangular frame and wavy interlayers enhanced both stiffness and toughness. Additionally, by incorporating strategically placed holes and extending the thermal diffusion path, we significantly improved the thermal insulation of the structure, achieving an ultralow thermal conductivity of 0.24 W/(m K). Furthermore, an iron-free geopolymer coating reduced overheating under sunlight by 51.5 °C, underscoring the material's potential for space applications. © 2025 Elsevier Ltd

关键词： Compressive strength

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Analysis of Spiral Scanning Amplitude Modulation Methods for Two-photon Endomicroscopy 10

Analysis of Spiral Scanning Amplitude Modulation Methods for...

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10th Symposium on Novel Optoelectronic Detection technology and Applications

作者： Cui, Haodong Wang, Conghao Liu, Huilan Zhang, Xiulei Hu, Yanhui Fu, Qiang Wu, Runlong Wang, Aimin Feng, Lishuang School of Instrumentation and Optoelectronic Engineering Beihang University Beijing100191 China Beijing100191 China School of Automation Science and Electrical Engineering Beihang University Beijing100191 China Beijing Transcend Vivoscope Biotech Co. Ltd. Beijing100049 China Beijing Key Laboratory for Optoelectronics Measurement Technology Beijing Information Science and Technology University Beijing100192 China State Key Laboratory of Advanced Optical Communication System and Networks Department of Electronics Peking University Beijing100871 China

ISBN: (数字)9781510688155

ISBN: (纸本)9781510688148

Two-photon endomicroscopy is a high-resolution label-free imaging technique for biological tissues. This paper analyzes sinusoidal and triangular amplitude modulation methods for spiral scanning two-photon endomicroscopy. In the theoretical modeling section, the mathematical model of PZT fiber scanner is established, and the distortion of fiber scanning trajectory caused by two amplitude modulated sine wave signals is simulated and evaluated. In the experimental verification section, a test platform is constructed to measure the scanning trajectory distortion driven by these amplitude modulated sine wave signals. Finaly, spiral scanning two-photon endomicroscopic imaging of in-vivo GFP mice brain tissues using sinusoidal amplitude modulated signals are demonstrated. © 2025 SPIE.

关键词： Amplitude modulation

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Research on the Effect of Surface Roughness of Molybdenum Shield on the Sapphire Crystal Growth

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Integrated Ferroelectrics 2025年

作者： Wang, DongYang Jiang, JianWei Liu, KaiGe Ruan, ShuangChen Zhai, JianPang College of Big Data and Internet Shenzhen Technology University Shenzhen China Guangdong Key Laboratory for Biomedical Measurements and Ultrasound Imaging National-Regional Key Technology Engineering Laboratory for Medical Ultrasound School of Biomedical Engineering Shenzhen University Medical School Shenzhen China College of New Materials and New Energies Shenzhen Technology University Shenzhen China Key Laboratory of Advanced Optical Precision Manufacturing Technology of Guangdong Higher Education Institutes Shenzhen Technology University Shenzhen China

The temperature field determines the environment in which sapphire crystals are grown, and the molybdenum shield is one of the core components to maintain a stable temperature field. In production, it has been found that the appearance of the molybdenum shield surface changes as the use time increases. In this study, the surface roughness and reflectivity of old and new molybdenum shield samples were tested, and it was found that the surface roughness of the old molybdenum shield was larger and the reflectivity was lower, and the reflectivity of the molybdenum shield was negatively correlated with its surface roughness. Based on the test data, the sapphire crystal growth process was simulated numerically, and the crystal growth experiments were carried out using the old and new molybdenum shield respectively. The old molybdenum shield with low reflectivity would increase the power of the single crystal furnace, change the radial and axis temperature distribution of the temperature field, and make the crystal-melt growth interface too flat and the stress value too large, resulting in increasing the risk of cracking and bubbles in the crystal, leading to the degradation of crystal quality. © 2025 Taylor & Francis Group, LLC.

关键词： Single crystals

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Double Hilbert transform based nonlinear harmonics correction for fringe projection profilometry

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Optik 2025年 327卷

作者： Wang, Beibei sun, Huanghe Huang, Chaoguang Huang, Wenbin Wang, Haijian Li, Wenjie Guangxi Key Laboratory of Manufacturing System & Advanced Manufacturing Technology School of Mechanical and Electrical Engineering Guilin University of Electronic Technology Guilin541004 China Engineering Research Center of Digital Imaging and Display Ministry of Education Soochow University Suzhou215006 China Guilin Kenvin Peter Technology Co. Ltd. Guilin541001 China

Fringe projection profilometry (FPP) has the advantages of large field of view, high precision and resolution, and is widely used in industrial inspection, medical treatment, aerospace and other fields. The nonlinear response between the camera and the projector in the system will affect the sinusoidal intensity of the captured fringe images, produce periodic phase errors, and affect the final reconstruction accuracy. Traditional double N-step phase shift (NPS) and Hilbert transform (HT) methods only correct the fundamental harmonic part of the phase nonlinear errors, and ignore the rest of the higher harmonic. Therefore, a double HTs based nonlinear phase error correction method is proposed, taking the higher order nonlinear harmonics into account. The artificial sinusoidal fringe images without background term are constructed using the wrapped phase calculated by captured fringe images. Then the HT is performed to convert the phase error to multiplication from addition, which can realize error balance in phase calculation. After obtaining the new phase, reoperation of artificial fringe generation and HT (AHT) is carried out to effectively remove the high order harmonic part of nonlinear harmonics. In proposed method, the wrapped phase calculated by captured fringe images is directly used to generate the artificial fringe images, which does not require additional projection patterns and realize real-time correction of phase nonlinear errors with high accuracy. Furthermore, direct artificial fringe generation also can efficiently avoids the effect of background intensity to the HT. Theoretical analysis, simulation analysis and experimental verification all prove the feasibility and superiority of the proposed method. © 2025 Elsevier GmbH

关键词： Harmonic analysis

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Study on the thinning characteristics of aviation tubes during bending forming under boundary lubrication friction

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Journal of manufacturing Processes 2025年 149卷 443-455页

作者： Yu Wu Zhineng Wang Jing Tian Renzhen Chen Weiming Lin Yaochen Lin Health Maintenance for Mechanical Equipment Key Lab Hunan University of Science and Technology Xiangtan 411201 China Liaoning Key Laboratory of Advanced Measurement and Test Technology for Aviation Propulsion System Shenyang Aerospace University Shenyang 110136 China Zhejiang King-Mazon Intelligent Manufacturing Corp. Ltd Lijiang 321400 China

The reduction of wall thickness during the bending forming process of aviation tubes is a common issue, particularly for large-diameter, thick-walled tubes. Under heavy load conditions, the lubrication state deteriorates, leading to a boundary lubrication state that complicates the prediction of wall thickness reduction. Current research on tube bending forming relies on Coulomb friction, which does not accurately reflect real-world conditions. Therefore, we propose a method for analysing tube thinning during bending forming that considers the friction characteristics of boundary lubrication. ABAQUS/VFRIC was employed to develop a dynamic friction model that considers contact pressure. Additionally, material hardness and RMS roughness were incorporated into the finite element simulation. Results show that as the tubing advances, the contact area between the pressure die and the tube changes and the friction between them generates a certain amount of compressive stress. An increase in contact pressure results in a higher friction coefficient, leading to a substantial rise in the tensile stress on the tube's exterior, further aggravating the thinning of the outer wall. In particular, stress concentrations and elevated strains resulting from boundary lubrication friction are especially pronounced at the 40° and 60° bending positions. In addition, increased RMS roughness and decreased material hardness contribute to more significant thinning effects. Experimental verification indicates that this dynamic friction model offers greater accuracy than the traditional Coulomb friction model in predicting wall thickness thinning, achieving a maximum error reduction to 3% and an accuracy enhancement of 7%. The findings provide theoretical support for process optimisation in aerospace manufacturing and establish a foundation for designing and implementing high-precision forming processes.

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