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[Ceramic Engineering and Science Proceedings] Proceeding of the 42nd International Conference on Advanced Ceramics and Composites (Ceramic Engineering and Science Proceedings Volume 39, Issue 2) || Influences of Laser Condition and Slit Shape on Joinability of Zircaloy-SiC/SiC Composite Tube Joint
摘要： As for the fuel cladding in the light-water reactor, silicon carbide fiber reinforced silicon carbide composite (SiC/SiC composite) is one of the promising candidates as a replacement of zircaloy due to many superiorities, where it is necessary to develop the end-cap seal of SiC/SiC composite cladding. In this research, the caulking method was employed as the method for sealing the end cap of SiC/SiC composite tube by zircaloy tube where the titanium micro-powder was inserted between two tubes. The diode or fiber laser was circumferentially irradiated on the outer surface of zircaloy tube, and the insert method of titanium powder was varied by changing the cutting method of SiC/SiC composite tube. The results using the diode laser irradiations with the screw cutting indicated that the wider width of irradiation line seems to be inadequate because the shrinkage of zircaloy would break the thread of SiC/SiC composite. In addition, the examinations about the slit shape effect for the flat cutting suggested that the hook slit is considered to be the best cutting method for holding the titanium powder during the laser irradiation where the width of slit should be narrower than that of laser irradiation line.
关键词： SiC/SiC composite,titanium micro-powder,caulking method,laser irradiation,zircaloy
更新于2025-09-23 15:21:01
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One-step synthesis and deposition of ZnFe2O4 related composite films via SPPS route for photodegradation application
摘要： Binary spinel-type metal oxides (AB2O4) related materials, including ferrites (AFe2O4), are attractive photocatalysts thanks to their excellent visible light response for the photodegradation of organic pollutants. Currently, these materials are synthesized via conventional chemical routes suffering from long preparation duration and multistep. Solution Precursor Plasma Spray (SPPS) process is a single-step method for depositing photocatalytically active zinc ferrite-based films within several minutes. The influence of the precursor ratio on the microstructures and phase compositions of the ZnFe2O4 films was investigated by XRD and Raman analyses. In addition, two optimized ZnFe2O4 films were prepared by increasing the ZnO loading and tailoring injection pattern of the precursor solution. The surface morphologies and optical bandgap were also determined by SEM and UV-visible spectroscopy. The photocatalytic activities of the ZnFe2O4 films were evaluated through the degradation of the Orange II dye and of tetracycline hydrochloride under UV or visible light irradiation. The results show that compositional ratios and composition distribution of the ZnFe2O4 films prepared via SPPS played a key role on the photocatalytic activity. The SPPS route was demonstrated to be a promising method for the synthesis and the deposition of metal oxide (i.e. perovskite type and spinel type) films within a single-step for functional applications.
关键词： Solution Precursor Plasma Spray,Photocatalytic degradation,zinc ferrite,composite films
更新于2025-09-23 15:21:01
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Optimizing optical tweezing with directional scattering in composite microspheres
摘要： We demonstrate that achieving zero backward scattering (ZBS), i.e., the first Kerker condition, allows for optical tweezing of high-index microspheres, which cannot be trapped using standard techniques. For this purpose, we propose an alternative material platform based on composite metamaterials. By tuning the volume filling fraction of inclusions and the microsphere radius, stable trapping can be achieved provided that ZBS is combined with the condition for destructive interference between the fields reflected at the external and internal interfaces of the microsphere when located at the focal point. By using the Mie-Debye-spherical aberration theory, we also show that the ZBS condition is even more useful in realistic, standard optical tweezer setups, in which spherical aberration is unavoidable due to refraction at the interface between the glass slide and the water-filled sample. Altogether, our findings not only pave the way for possible new trapping designs and applications but also unveil the role of backscattering in the physics of optical tweezers.
关键词： Kerker condition,optical tweezing,Mie-Debye-spherical aberration theory,directional scattering,composite microspheres
更新于2025-09-23 15:21:01
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Inkjeta??Printed TiO <sub/>2</sub> /Fullerene Composite Films for Planar Perovskite Solar Cells
摘要： Perovskite solar cells have garnered and held international research interest, due to ever-climbing power conversion efficiency values, now >25%. Some high efficiency configurations utilize a compact TiO2 layer underneath a mesoporous TiO2 layer, both of which require high temperature annealing steps that could hinder perovskite commercialization. To address the high thermal budget, we chose to use inkjet-printing to combine the two layers into a single TiO2 film, which incorporates both nanoparticle and molecular precursor as well as organic fullerene additives. We printed the ink on fluorine-doped tin oxide, and after annealing at various temperatures, we found that 400°C was the optimum annealing temperature for the inkjet-printed electron transport layers, which is significantly lower than the 500°C required to anneal typical mesoporous TiO2 films.
关键词： composite transport layer,inkjet printing,perovskite solar cells,solar cells
更新于2025-09-23 15:21:01
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Phase Change Behavior of Sn <sub/>20</sub> Sb <sub/>80</sub> /Si?Nano-Composite Multilayer?Thin?Films
摘要： Nano-composite multilayer Sn20Sb80/Si thin films were studied by thermal, electrical and optical methods. Compared with Sn20Sb80, Sn20Sb80/Si film was proved to be a more promising candidate for phase change memory device applications because of its higher crystallization temperature (246?C) and larger crystallization activation energy (2.6 eV). The bandgap was broadened with the increase of Si layer thickness. The crystallization of Sn20Sb80 was restrained after the adding of more Si film layers confirmed by X-ray diffraction patterns. A smoother surface was obtained with the root-mean-square surface roughness of 0.753 nm for [Sn20Sb80(3nm)/Si(7nm)]5 thin film. The measurement using the picosecond laser technique showed that [Sn20Sb80(3nm)/Si(7nm)]5 thin film could achieve the crystalline-to-amorphous phase transform within 2.8 ns irradiated by the laser pulse.
关键词： bandgap,nano-composite multilayer thin films,picosecond laser technique,crystallization activation energy,Phase change memory,surface roughness,Sn20Sb80/Si,crystallization temperature
更新于2025-09-23 15:21:01
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Performance of dye-sensitized solar cell (DSSC) using carbon black-TiO2 composite as counter electrode subjected to different annealing temperatures
摘要： Carbon black-TiO2 composite counter electrode was synthesized via solid state method and subsequently annealed at different annealing temperatures (450–550 °C). The composite was investigated as a counter electrode, acting as an alternative to platinum in a dye-sensitized solar cell. The aim is to obtain a higher conversion efficiency of solar energy being converted into electricity. The synthesized sample was structurally characterized by X-ray diffraction and it was found that annealing temperature strongly enhanced the anatase structure of carbon black-TiO2. The surface morphology and grain size were examined by field emission scanning electron microscopy which showed the presence of mesoporous structure; this is very important for high quality dye and electrolyte distribution. Electrochemical studies of carbon black-TiO2 counter electrodes suggest that increasing the annealing temperature may lead to increased charge transfer resistance which could contribute to decreased catalytic activity. The photovoltaic properties of carbon black-TiO2 were observed to be strongly influenced by the annealing temperature; measurements taken at annealing temperature of 525 °C showed the best photovoltaic properties of JSC = 6.10 mA/cm2, VOC = 0.51 V, FF = 0.89 and η = 2.77%.
关键词： Carbon black-TiO2 composite,Solid state method,Counter electrode,Annealing temperature
更新于2025-09-23 15:21:01
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Modeling and Stability Analysis of Coarsea??Fine Composite Mechatronic System in UAV Multi-Gimbal Electro-Optical Pod
摘要： Coarse–?ne composite mechatronic systems face numerous challenges due to the structural complexity and diversi?cation of multi-gimbals. The core goal of this manuscript is to address the issue of the coarse-?ne composite mechatronic system stability of a UAV (unmanned aerial vehicle) multi-gimbal electro-optical pod using USM-VCM (ultrasonic motor and voice coil motor) mechatronic design, Euler dynamics modeling, and stability DOB (disturbance observer) control. In response to this problem, a Hall e?ect electromagnetic circuit and USM-VCM drive acquisition circuit are designed. A Euler dynamics model in the Cartesian coordinate system is built to derive the kinematics coupling compensation matrix and mechanical parameter optimization method between the gimbals. Finally, the model is substituted into the DOB suppression control, which can monitor and compensate the motion coupling between the coarse–?ne composite mechatronic systems in real time. Results show that the disturbance suppression impact of the DOB method with the Euler optimization model and USM-VCM mechatronic design is increased by up to 90% compared to the PID (proportion integration di?erentiation) method and 20% better than the traditional DOB method.
关键词： electro-optical pod,coarse–fine composite,mechatronic system,multi-gimbal,USM-VCM,drive acquisition circuit
更新于2025-09-23 15:21:01
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Preliminary Characterization of Glass/Alumina Composite Using Laser Powder Bed Fusion (L-PBF) Additive Manufacturing
摘要： Powder bed fusion (PBF) additive manufacturing (AM) is currently used to produce high-efficiency, high-density, and high-performance products for a variety of applications. However, existing AM methods are applicable only to metal materials and not to high-melting-point ceramics. Here, we develop a composite material for PBF AM by adding Al2O3 to a glass material using laser melting. Al2O3 and a black pigment are added to a synthesized glass frit for improving the composite strength and increased laser-light absorption, respectively. Our sample analysis shows that the glass melts to form a composite when the mixture is laser-irradiated. To improve the sintering density, we heat-treat the sample at 750°C to synthesize a high-density glass frit composite. As per our X-ray diffraction (XRD) analysis to confirm the reactivity of the glass frit and Al2O3, we find that no reactions occur between glass and crystalline Al2O3. Moreover, we obtain a high sample density of ≥95% of the theoretical density. We also evaluate the composite’s mechanical properties as a function of the Al2O3 content. Our approach facilitates the manufacturing of ceramic 3D structures using glass materials through PBF AM and affords the benefits of reduced process cost, improved performance, newer functionalities, and increased value addition.
关键词： density,powder bed fusion,additive manufacturing,mechanical property,3D printing,glass/alumina composite
更新于2025-09-23 15:21:01
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Multicolor Persistent Luminescence Realized by Persistent Color Conversion
摘要： Spectral tuning is important for the development of persistent phosphors. Here we introduce a color conversion concept to obtain abundant persistent luminescence spectra in addition to existing methods of exploring new matrix and/or dopants. In this study, CaAl2O4:Eu,Nd was chosen as a blue persistent donor phosphor, while Lu3Al5O12:Ce and other four commercial phosphors were explored as conversion phosphors to obtain colorful persistent luminescence spectra. Both the persistent donor phosphor and conversion phosphors were embedded into resin, forming ternary composite chips to ensure efficient energy transfer. Continuous color tuning were realized by simply changing the mass ratio of the persistent donor phosphor vs. conversion phosphor. Our work will be significant in indicating other persistent/conversion composite materials or nanostructures with abundant spectral properties.
关键词： composite,Persistent luminescence,afterglow,persistent phosphor,spectral tuning
更新于2025-09-23 15:21:01
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Water hyacinth derived carbon quantum dots and g-C3N4 composites for sunlight driven photodegradation of 2,4-dichlorophenol
摘要： Carbon dots (CDs) were successfully derived from water hyacinth leaves and the binary composite was achieved by incorporating CDs with g-C3N4 through hydrothermal treatment. The average particle size of CDs was found to be 3.1 nm and a blue-green fluorescence was emitted under the UV light irradiation. Both of the composites loaded with 20 wt.% (20CDs/g-C3N4) and 40 wt.% (40CDs/g-C3N4) of CDs achieved the highest degradation efficiency of 2,4-dichlorophenol (2,4-DCP) with 1.7 times higher than that of pure g-C3N4. This work successfully improved the properties of g-C3N4 by elongating the lifetime of photogenerated electrons and widening the visible light response. Both of 20CDs/g-C3N4 and 40CDs/g-C3N4 recorded the highest photocatalytic performance in degrading 2,4-DCP with degradation rate constant of 0.0194, and 0.0186 min?1, respectively. This is contributed by the prolonged charge carrier lifetime in 20CDs/g-C3N4; good visible light absorption and high specific surface area in 40CDs/g-C3N4. For the scavenger test, hole (h+) and superoxide radical (·O2?) were acknowledged as the key active species in photocatalysis.
关键词： Carbon quantum dots,Water hyacinth,CDs/g-C3N4 composite,2,4-Dichlorophenol
更新于2025-09-23 15:21:01