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Performance optimization of complicated structural SiC/Si composite ceramics prepared by selective laser sintering
摘要： Combining reaction-bonded (RB) process and selective laser sintering (SLS) method is an e?ective approach to prepare ceramic components with complex shapes. The purpose of this paper is to ?nd e?cient ways to improve the performance of SiC/Si composites prepared by SLS/RB technologies. E?ects of epoxy resin binder on the performance and microstructure of preforms and sintered bodies were studied ?rst. Then, based on the above results, graphite with low reactivity was used as an alternative slow-release carbon source to promote sintering densi?cation process and improve the carbon density of preforms. When the added amount of graphite increased, clusters of nanometer-sized SiC grains formed and the silicon phase transformed into pieces, which reduced the content and dimension of silicon phase. Furthermore, by applying a two-step sintering method, the residual silicon content of SiC/Si composites decreased further and the ?exural strength at high temperatures increased.
关键词： Performance enchantment,High-temperature behavior,Selective laser sintering,Reaction-bonded process
更新于2025-09-12 10:27:22
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Modern Manufacturing Processes || Selective Laser Sintering
摘要： Selective laser sintering (SLS), developed and patented at the University of Texas at Austin in the mid‐1980s, is an additive manufacturing (AM) technology used to produce three‐dimensional (3D) physical objects, layer by layer, from computer‐aided design (CAD) models. The technology is based on a laser beam that selectively irradiates and sinters consecutive layers of material, in powder form, to obtain a specific 3D product. Therefore, any powder material capable of absorbing electromagnetic radiation could be used in the SLS process to manufacture final parts or products. SLS, considered one of the most important AM manufacturing processes, may shorten the manufacturing cycle time, reducing production costs and promoting competitiveness, compared to traditional technologies.
关键词： 3D Printing,Powder Material,Selective Laser Sintering,Laser Beam,Additive Manufacturing
更新于2025-09-11 14:15:04
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Flexible Pressure Sensors with Wide Linearity Range and High Sensitivity Based on Selective Laser Sintering 3D Printing
摘要： To achieve practical applications of flexible pressure sensors, good performance and scalable manufacturing processes are both desired. Here, flexible pressure sensors with excellent performance are fabricated via selective laser sintering (SLS). Having benefitted from the irregular microstructures generated in the powder sintering process, the sensors exhibit high sensitivity of 55 kPa?1 in a wide linearity range of 100 kPa, and they maintain decent sensitivity (>10 kPa?1) over a high-pressure range (100–400 kPa), which is among the best results for flexible pressure sensors. The working mechanism of the sensor is finely revealed combining in situ observations and electrical simulations. The results demonstrate that electrical saturation (due to parasitic resistance) greatly affects the linearity range except for the geometric saturation of the microstructure. As a proof of concept, tactile, pulse, muscle stiffness, and plantar pressure tests are performed. The fast and stable responses of the sensor show its great potential for electronic skin, human–machine interface, and healthcare monitoring. Besides its excellent performance, the fabrication processes via SLS are compatible with fab-scale production and flexible customization, which pave new paths for the mass manufacturing and diversified applications of flexible pressure sensors in the future.
关键词： flexible pressure sensors,selective laser sintering 3D printing,linearity range,graphene,surface microstructures
更新于2025-09-11 14:15:04
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Preparation of high-porosity Al2O3 ceramic foams via selective laser sintering of Al2O3 poly-hollow microspheres
摘要： In this paper, high-porosity Al2O3 ceramic foams called Al2O3 PHM ceramics were fabricated through selective laser sintering (SLS) via Al2O3 poly-hollow microspheres (Al2O3 PHMs). SLS parameters were optimized by an orthogonal experiment as laser power = 6 W, scanning speed = 1800 mm/s, and scanning space = 0.15 mm. The effect of sintering temperature on microstructure, shrinkage, porosity, phase composition, mechanical properties and pore size distribution of Al2O3 PHM ceramics were investigated. When sintering temperature increased, Al2O3 PHM ceramics contained only Al2O3 phase and were gradually densified. With the raise of sintering temperature, the porosity of Al2O3 PHM ceramics decreased gradually from 77.09% to 72.41%, but shrinkage in H direction and compressive strength of Al2O3 PHM ceramics increased from 6.63% and 0.18 MPa to 13.10% and 0.72 MPa, respectively. Sintering temperature had little effect on pore size distribution of Al2O3 PHM ceramics, which only declined from 24.2 to 21.4 μm with the increase of sintering temperature from 1600 to 1650 °C. This method can not only directly prepare ceramic foams with complex shapes, but also control properties of ceramic foams. It provides a simple preparation method for many kinds of ceramic foams with complex structure and high porosity by using PHMs with different composition.
关键词： Selective laser sintering,Porosity,Poly-hollow microsphere,Ceramic foams,Mechanical properties
更新于2025-09-11 14:15:04
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Performance analysis of tool electrode prepared through laser sintering process during electrical discharge machining of titanium
摘要： Nowadays, additive manufacturing (AM)-based rapid prototyping (RP) is used as a convenient route for making tool electrodes required in electrical discharge machining (EDM). AM enables direct fabrication of complex shaped EDM electrode in comparatively less time in contrast to subtractive machining processes. In this study, an EDM electrode is prepared directly by selective laser sintering (SLS) process using metal matrix composite of aluminium (Al), silicon (Si) and magnesium (Mg). To study the performance of the prepared RP tool electrode in electrical discharge machining, titanium is used as workpiece material and EDM-30 oil as dielectric medium during machining. The performance of the prepared tool electrode is compared with conventional copper and graphite tool electrodes. Experiments have been conducted changing EDM process parameters viz. open circuit voltage (V), peak current (Ip), duty cycle (τ) and pulse duration (Ton) along with three tool electrodes such as RP, graphite and copper tool electrodes. The performance measures considered during the experimental study are material removal rate (MRR), tool wear rate (TWR), average surface roughness (Ra), white layer thickness (WLT), surface crack density (SCD) and micro-hardness (MH) on white layer. SEM and EDX of the machined surface reveal that tool material is generally eroded and deposited on the machined surface with formation of metal carbides. However, tool erosion is more pronounced in case of RP tool electrode. XRD analysis reveals the formation of titanium carbides on the machined surface resulting in increase in the micro-hardness of white layer. Discharge current and tool type are found to be significant parameters influencing the performance measures considered in the study. The surface produced when machined with RP tool electrode exhibits superior surface characteristics while graphite tool electrode produces better MRR and TWR.
关键词： Selective laser sintering,Electrical discharge machining,AlSi10Mg,Titanium
更新于2025-09-11 14:15:04