The Experts below are selected from a list of 156423 Experts worldwide ranked by ideXlab platform
Wenming Jiang - One of the best experts on this subject based on the ideXlab platform.
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comparative study on performance and microstructure of composite water soluble salt Core Material for manufacturing hollow zinc alloy castings
Materials Chemistry and Physics, 2020Co-Authors: Suo Tu, Guanjin Li, Xiaolong Gong, Wenming JiangAbstract:Abstract The water-soluble salt Core Material has been successfully used for manufacturing hollow aluminum and magnesium alloy castings. However, there is rare report about the water-soluble salt Core being used for lower melting point and higher density hollow zinc alloy castings. In order to obtain a high-performance composite water-soluble salt Core Material (CWSSC) which is suitable for manufacturing hollow-structure zinc alloy castings via high pressure die casting process, the comparative study on performance and microstructure of the salt Cores fabricated by gravity casting technology was investigated using KNO3 and KCl as the base salt Material with the reinforcements of bauxite or glass-fiber powder. The results show that CWSSC strengthened by reinforcements possesses many advantages of good surface quality and water-solubility rate, high bending strength and impact toughness, low shrinkage and moisture-absorption rate, and CWSSC composed of KNO3-20 mol% KCl with 15 wt% bauxite powder and 15 wt% glass-fiber powder has the better comprehensive performance, whose surface roughness is 0.4758 μm, bending strength is 46.6 MPa, impact toughness is 21.72 kJ/m2, and water-solubility rate is 178.21 kg/(min·m2) in still water at 80 °C with relatively low shrinkage and 24 h moisture-absorption rate. The scanning electron microscope analysis shows that the strengthening-toughening mechanisms of CWSSC mainly include refinement of the grain and deflection of the crack caused by KCl dendritic crystal and the rigid enhanced powders. A practical casting test has been conducted to prove that the developed CWSSC can be used to manufacture hollow-structure zinc alloy castings.
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performance characteristics of collapsible cao sio2 based ceramic Core Material via layered extrusion forming
Ceramics International, 2019Co-Authors: Li Yang, Shiya Tang, Fuchu Liu, Xinwang Liu, Wenming JiangAbstract:Abstract An additive manufacturing method, named layered extrusion forming (LEF), was adopted to fabricate collapsible ceramic Cores. Green samples were first fabricated using CaCO3 and SiO2 powders as precursor Materials and aqueous polyethylene glycol solution-silica sol as a composite binder and then calcined at 1100 °C − 1300 °C for 2 h. The effect of CaO-SiO2 molar (C/S) ratio on the performance characteristics of green and sintered samples was investigated. The results showed that the slurries exhibited a pseudoplastic behavior for different C/S ratios, and the linear shrinkage of the green samples showed a slight increase with decreasing C/S ratio. After sintering, the reduction of C/S ratio obviously decreased linear shrinkage and bending strength, whereas strengthened the hydration resistance. The microstructure analysis demonstrated that the porosity was increased with decreasing C/S ratio, thereby weakening the bending strength. The ceramic Cores samples were constituted by Ca2SiO4 and CaO phases. The existence of the Ca2SiO4 improved the hydration resistance, leading to relative lower collapsibility. The sintered samples with a C/S ratio of 2.45 obtained a superior collapsibility in water, especially in the higher water temperature, which is significant for industry applications.
Baoyu Song - One of the best experts on this subject based on the ideXlab platform.
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strength stiffness and panel peeling strength of carbon fiber reinforced composite sandwich structures with aluminum honeycomb Cores for vehicle body
Composite Structures, 2018Co-Authors: Jianfeng Wang, Na Yang, Baoyu SongAbstract:Abstract Due to its superior performance, composite sandwich structure Materials are widely used in the automobile industry, especially for vehicle body applications. Optimization of the design of composite aluminum honeycomb sandwich structures is therefore of great significance. In this study, carbon fiber-reinforced composite sandwich structures cured at high temperatures with aluminum honeycomb structures as the Core Material were investigated. Specifically, the effects of Core thickness and density on the laminate Material properties were studied by three-point bending and panel peeling tests.
Warna Karunasena - One of the best experts on this subject based on the ideXlab platform.
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in plane shear behaviour of fibre composite sandwich beams using asymmetrical beam shear test
Construction and Building Materials, 2010Co-Authors: Allan Manalo, Thiru Aravinthan, Warna KarunasenaAbstract:The in-plane shear behaviour of a new generation composite sandwich beam made up of glass fibre skins and modified phenolic Core Material was investigated to determine its application as shear loading component in a structural beam. Iosipescu shear test was conducted to characterise the shear properties of the fibre composite skins and the phenolic Core Material. The fibre composite sandwich beams were then tested under asymmetrical beam shear to determine its behaviour under in-plane shear loading. The results show that the in-plane shear behaviour of the composite sandwich beam is similar to that of the skins. A theoretical prediction of the in-plane shear strength of the composite sandwich beam was proposed and showed a good agreement with the experimental results. Based on the results of the study, the asymmetrical shear test is recommended as a test method for determining the shear properties of sandwich structures with high strength Core Materials.
Matthias Radle - One of the best experts on this subject based on the ideXlab platform.
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correlation of pore size distribution with thermal conductivity of precipitated silica and experimental determination of the coupling effect
Applied Thermal Engineering, 2019Co-Authors: Sebastian Sonnick, Manuel Meier, Jesse Rossjones, L Erlbeck, Isabel Medina, Hermann Nirschl, Matthias RadleAbstract:Abstract Vacuum insulation panels are high-performance insulating Materials with considerably better thermal properties than conventional thermal insulation. Unfortunately, their use is limited to applications where their high price does not matter. To extend the application range of vacuum insulation, the authors try to replace the high-priced Core Material fumed silica with the cheaper precipitated silica. For this purpose, five commercially available precipitated silica samples were tested for their suitability as Core Material for vacuum insulations. They were pre-pressed with 5 bar and 30 bar each. To compare their thermal performances, a guarded hot plate apparatus for measuring thermal conductivities under vacuum was developed. The pore size distributions of the samples were measured by mercury intrusion porosimetry and used to calculate the gas thermal conductivity as a function of the residual pressure. For this purpose, a correction factor for the measured pore size distribution is introduced. Additionally, the coupling effect between gaseous and solid thermal conductivity could be determined through comparison with measured data. A model is presented to predict the thermal conductivity curve, even of unknown silica samples, solely using mercury intrusion porosimetry data.
Jianfeng Wang - One of the best experts on this subject based on the ideXlab platform.
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strength stiffness and panel peeling strength of carbon fiber reinforced composite sandwich structures with aluminum honeycomb Cores for vehicle body
Composite Structures, 2018Co-Authors: Jianfeng Wang, Na Yang, Baoyu SongAbstract:Abstract Due to its superior performance, composite sandwich structure Materials are widely used in the automobile industry, especially for vehicle body applications. Optimization of the design of composite aluminum honeycomb sandwich structures is therefore of great significance. In this study, carbon fiber-reinforced composite sandwich structures cured at high temperatures with aluminum honeycomb structures as the Core Material were investigated. Specifically, the effects of Core thickness and density on the laminate Material properties were studied by three-point bending and panel peeling tests.