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Optimized design of silicone pad for bended window lamination in organic light-emitting diodes
摘要： Recently, various types of displays have been developed for use in smartphones. In particular, the shape of the glass used as the cover window of a smartphone has developed from a flat shape to a vandal shape with multiple curvatures. The lamination process for bonding an OLED backplane to such a bended cover window requires a relatively high level of skill. To develop such a technique, we designed a silicone pad with sufficient adhesive strength to suit the various curvatures. In this paper, we have confirmed the results.
关键词： Lamination,Silicone,Shore hardness,Organic light-emitting diodes,Optically clear adhesive
更新于2025-09-16 10:30:52
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Study on Fe-xGO Composites Prepared by Selective Laser Melting: Microstructure, Hardness, Biodegradation and Cytocompatibility
摘要： The problem of the degradation rate being too slow is a key technical bottleneck to clinical applications for pure iron (Fe), a promising candidate biodegradable metal. This work used powders of pure Fe and graphene oxide (GO) to prepare Fe-xGO composites (x = 0.4 wt.%, 0.8 wt.%, 1.2 wt.%, and 1.6 wt.%) via selective laser melting (SLM), aiming to obtain a higher degradation rate. The microstructure, hardness, biodegradation and cytocompatibility were investigated. The degradation rate of the SLMed Fe-xGO composites was faster than that of SLMed Fe, due to incorporating GO into Fe. The GO content had a significant effect on the microstructure, hardness and degradation rate. The SLMed Fe-0.8 GO composite presented the finest, relatively uniform grains, had the maximum degradation rate, density and hardness, and had good cytocompatibility. The mechanisms were also clarified.
关键词： biodegradation,Fe-xGO composites,hardness,cytocompatibility,selective laser melting,microstructure
更新于2025-09-16 10:30:52
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Research of high-performance DLC Film on Si Substrate by Pulsed Laser Deposition
摘要： Femtosecond pulsed laser was used to deposit DLC films. Through methods of oxygen ambient and mixing silicon, no-hydrogen DLC films were deposited with more excellent transmission, hardness, adhesion and stability than those by chemical vapor deposition or traditional pulsed laser deposition (PLD). The transmission of 3~5μm band was larger than or equal to 91.7%, and the hardness up to 40~50GPa. All the films passed the tests of high temperature, low temperature, salt-fog and heavy-friction tests. The performances of the samples satisfied optical engineering need.
关键词： transmission,oxygen ambient,mixing silicon,femtosecond pulsed laser,hardness,DLC films
更新于2025-09-16 10:30:52
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Research on Microstructure and Hardness of Laser Cladding Using the Mixed Powder of Nano-TiC and Ni-Based Alloy
摘要： Aiming at the problem of poor high-temperature wear-resistance of rope clamp used in super-high speed elevators, the experiments of laser cladding to prepare carbide reinforced composite coating were made. Nano-TiC powder, Ni-based alloy powder were used as cladding material. The microstructure and hardness of composite coating were tested by relevant equipments. The research results show that the composite coating is made up of TiC, Cr3C2, Fe3C and Fe-Ni-Cr-C solid solution. When the content of TiC is 10%, 30%, the morphology of TiC is presented as dendrite-like and the morphology of solid solution is presented as cellular-like. When the content of TiC is 50%, the morphology of TiC is presented as block-like, lath-like. There are some microcracks on grain boundaries. At the content of 30%, laser power 1.5KW, scanning speed 600mm/min, the laser cladding has no crack and hole. The average hardness of composite coating is 701HV0.2. Using this technology to the surface strengthening of elevator parts, the wear resistance and service life can be greatly improved.
关键词： nano-TiC,laser cladding,hardness,composite material,microstructure
更新于2025-09-16 10:30:52
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Microstructural characterization of Inconel 718 alloy after pulsed laser surface treatment at different powers
摘要： An annealed Inconel 718 alloy was surface-treated by pulsed laser at three different powers (100, 50 and 25 W). Microstructural changes induced by the laser treatments were characterized by use of electron backscatter diffraction and electron channeling contrast imaging techniques. Results show that both annealing twins and strengthening precipitates profusely existing in the as-received specimen are dissolved at elevated temperatures during the laser irradiation. Meanwhile, in the melting zone (MZ), densities of low angle boundaries (LABs) are greatly increased with a large number of Laves phases preferentially distributed along such LABs. For different specimens, widths and depths of their MZs are found to be gradually reduced with decreasing the laser powers. Orientation analyses reveal that the columnar grains in the MZ of the 100 W specimen could inherit orientations existing in the matrix while lower laser powers promote the formation of more nuclei with scattered orientations to grow to be granular grains in the MZ. Hardness tests reveal that the MZs of all laser-treated specimens are softer than the matrix probably due to both precipitate dissolution and grain coarsening.
关键词： pulsed laser surface treatment,hardness,grain boundaries,Inconel 718 alloy,electron backscatter diffraction
更新于2025-09-16 10:30:52
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An original LIBS system based on TEA CO2 laser as a tool for determination of glass surface hardness
摘要： This study was carried out to examine the applicability of original laser-induced breakdown spectroscopy (LIBS) setup for determination of the surface hardness of lead glass as a function of its chemical composition. For this purpose, a set of five lead glass samples with different amount of ZrO2 was prepared. The LIBS measurements were carried out using TEA CO2 laser in the air at atmospheric pressure and without sample preparation. A ratio of the intensity between the Zr(II) 355.66 nm and Zr(I) 360.12 nm emission lines has been used to examine the hardness of the material. In addition, the surface hardness of glass samples was determined by Vickers’s indentation tests. Obtained results indicate a linear relationship of the measurements of hardness in glass samples between the LIBS and Vickers method. To show that LIBS based on TEA CO2 laser is an almost nondestructive technique, profilometric surface analysis was used. The proposed LIBS system is suitable not only for a spectrochemical analysis but also as an easy to use and cost-effective way to measure the surface hardness for all types and shapes of glass samples which are in some cases difficult to examine by standard Vicker’s method.
关键词： surface hardness,lead glass,ZrO2,LIBS,TEA CO2 laser
更新于2025-09-12 10:27:22
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Rapid Solidification and Non-equilibrium Phase Constitution in Laser Powder Bed Fusion (LPBF) of AlSi10Mg Alloy: Analysis of Nano-precipitates, Eutectic Phases, and Hardness Evolution
摘要： The non-equilibrium phase evolution during laser powder bed fusion (LPBF) of AlSi10Mg alloy is thoroughly characterized and analyzed by means of advanced electron microscopy and analytical simulation of rapid solidification phenomenon. The evolution of microstructural strengthening agents such as inter-cellular eutectic phase and intra-cellular precipitates is presented in correspondence with the local variation of cellular/dendritic solidification patterns within a typical melt pool. The eutectic phase exhibits two different morphologies: lamellar and fibrous. As with the cell size variation, the overall volume fraction of eutectic phase and the lamella spacing is shown to gradually decrease by moving away from the melt-pool boundary (MPB), i.e., through crossing over from a coarse to a fine cellular zone. The eutectic-free regions within the a-Al cells contain a large number density of nano-sized precipitates that are predominantly Si-rich and are either fully or semi-coherent with the Al matrix. The formation of nano-precipitates is linked to the increased (non-equilibrium) solubility limits of a-Al cells due to the rapid solidification effect. For the first time, we identify such nano-precipitates with non-equilibrium crystal structures and morphologies: ‘‘Spheres’’ and ‘‘Ellipsoids’’ with Face Centered Cubic (FCC), and ‘‘Plates’’ and ‘‘Needles’’ with a Diamond Cubic (DC) superlattice structure that emerges from within the Al matrix. The microstructure in the heat-affected zone (HAZ) right underneath the MPB exhibits an absence of cell boundaries and eutectic phases while consisting primarily of large Si-rich and Mg-rich precipitates. Finally, the local variation of nano-hardness across a solidified melt pool is shown to correlate well with the corresponding profile of microstructural refinement, i.e., exhibiting a minimum at the HAZ and a peak at around the melt-pool centerline. The findings here can significantly advance the state of knowledge for the strengthening behavior in an as-built LPBF-processed AlSi10Mg alloy.
关键词： hardness evolution,Laser Powder Bed Fusion,non-equilibrium phase evolution,eutectic phases,nano-precipitates,AlSi10Mg
更新于2025-09-12 10:27:22
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Effective femtosecond laser shock peening on a Mg–3Gd alloy at low pulse energy 430?μJ of 1?kHz
摘要： In this paper, microstructure evolution and hardness of Mg-3Gd alloy treated by femtosecond (fs) laser shock peening (LSP) with direct and con?ned ablation modes were investigated in detail. Under a relatively low pulse energy of 430 μJ with a repetition of 1 kHz, the surface hardness of sample has been enhanced by 70% effectively. Compared with ns-LSP with pulse ?uence of 71.7 J/cm 2 , fs-LSP with pulse ?uence of 34.2 J/cm 2 is superior in the hardness increment, both of which are in the same order of magnitude. A distinct grain re?nement of surface layer has been discovered and results in the increase of hardness. Nonuse of absorption and con?ning layers and the employment of the industry commercial fs laser with high repetition can inspire big potential LSP application in special metal material.
关键词： Mg–3Gd alloy hardness,Laser shock peening,Surface treatment,Femtosecond laser
更新于2025-09-12 10:27:22
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Experimental Investigations on the Effects of Multicomponent Laser Boriding on steels
摘要： In this investigation, the effects of the multicomponent (Ni+Cr+B4C) laser boriding on the microstructure, microhardness, ductility and toughness of AISI 1020 steel are studied. Thick, hard, non-acicular and uniform boride layer are obtained as a result of laser boriding. The impact test results indicate that the laser borided specimens treated at higher energy densities of the laser beam have better ductility and toughness as compared with the specimens treated with lower energy densities of the laser beam as well as the continuous and the interrupted borided specimens.
关键词： Microstructure,Multicomponent boriding,Laser beam,Hardness gradient,Steel,Ductility and Toughness
更新于2025-09-12 10:27:22
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Fabrication of Metal Matrix Composite by Laser Metal Deposition—A New Process Approach by Direct Dry Injection of Nanopowders
摘要： Laser Metal Deposition (LMD) offers new perspectives for the fabrication of metal matrix nanocomposites (MMnCs). Current methods to produce MMnCs by LMD systematically involve the premixing of the nanopowders and the micropowders or require in-situ strategies, thereby restricting the possibilities to adjust the nature, content and location of the nano-reinforcement during printing. The objective of this study is to overcome such restrictions and propose a new process approach by direct injection of nanoparticles into a metallic matrix. Alumina (n-Al2O3) nanoparticles were introduced into a titanium matrix by using two different direct dry injection modes in order to locally increase the hardness. Energy dispersive X-ray spectroscopy (EDS) analyses validate the successful incorporation of the n-Al2O3 at chosen locations. Optical and high resolution transmission electron microscopic (HR-TEM) observations as well as X-ray diffraction (XRD) analyses indicate that n-Al2O3 powders are partly or totally dissolved into the Ti melted pool leading to the in-situ formation of a composite consisting of fine α2 lamellar microstructure within a Ti matrix and a solid solution with oxygen. Mechanical tests show a significant increase in hardness with the increase of injected n-Al2O3 amount. A maximum of 620 HV was measured that is almost 4 times higher than the pure LMD-printed Ti structure.
关键词： laser metal deposition,solid solution,direct nanopowder injection,lamellar microstructure,hardness,titanium aluminide,metal matrix composite
更新于2025-09-12 10:27:22