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The processing parameters of Polyacrlonitrile Electrospinning Filament Assembly with Parallel Alignment

International Conference on Frontiers of Nanoscience and Technology (ICFNST 2012)

作者： Lai, Kan Liu, Cheng-kun Chen, Mei-yu Sun, Run-jun Quartermaster Res Inst Gen Logist Dept PLA Hemp Res Ctr Beijing 100088 Peoples R China Xian Polytech Univ Coll Textile & Mat Xian 710048 Peoples R China

ISBN: (纸本)9783037854297

Using polyacrlonitrile as spinning materials, the paper investigated the factors affecting the preparation of electrospinning filament assembly with directional and parallel alignment. The experimental results showed that, for different receiving electrodes, it is possible to obtain the spinning filament assembly with parallel alignment by adjusting the processing parameters of electrospinning;higher solute concentration and appropriate voltage control are helpful to obtain the spinning filament assembly with parallel alignment.

关键词： polyacrylonitrile electrospinning parallel alignment processing parameters

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Optimization of processing parameters, physical and mechanical properties of SiC - CNF composites using Taguchi approach 9

Optimization of processing parameters, physical and mechanic...

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9th International Conference of Materials processing and Characterization (ICMPC)

作者： Mubina, Shaik Khanra, Asit Kumar Saha, Bhaskar Prasad Int Adv Reaearch Ctr Powder Met & New Mat Hyderabad 500005 Telangana India Natl Inst Technol Dept Met & Mat Engn Warangal 5060 Telangana India

Silicon carbide (SiC) based composite with the low specific weight, the high specific strength over a large temperature range, and their great damage tolerance compared to their monolithic counterpart make them extremely useful as a high temperature load bearing material for many advanced applications. However, the reliability of these highly tough fibre containing composites pose a problem in actual use unless consistent material properties are maintained by adopting optimized processing parameters. In this study an attempts have been made to develop carbon nanofibers (CNF) dispersed thin SiC tubes used in applications like nuclear industries, power industry, semiconductor industry, chemical and paper industries etc. The material properties of the composite tubes were optimized through design of experiments to optimize the parameters like sintering temperature, heating rate, holding time and at different CNF compositions by using Taguchi experimental design method with an L-9 (3<^>4) orthogonal array. Further, experiments were designed at the optimized processing conditions to evaluate the effect of particle size of SiC and CNF loading on properties of SiC-CNF composites by choosing an L-9 (3<^>3) orthogonal array of design. The experimental results i.e. performance parameters were analysed by Taguchi optimization method and microstructure analysis. The effect of variables on the properties of the composites were studied from the signal to noise ratio (S/N), analysis of variance (ANOVA), and interaction plots. processing at optimized conditions through design of experiments resulted in obtaining best properties when the values mentioned in parenthesis for the respective processing parameters like sintering temperature (2150 degrees C), heating rate (8 degrees C/min) and holding time (1hr) were maintained. SiC based composite with lwt% CNF loading was identified to be the best homogeneous composite with superior properties at optimized design parameters. Thin compos

关键词： SiC-CNFcomposites processing parameters Taguchi method properties optimization ANOVA

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Analysis of influences of processing parameters on filling behavior in microinjection molding with a hot runner nozzle

Analysis of influences of processing parameters on filling b...

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Asian Workshop on Polymer processing (AWPP2011)

作者： Gou, Gang Xie, Pengcheng Yang, Weimin Ding, Yumei Beijing Univ Chem Technol Coll Mech & Elect Engn Beijing 100029 Peoples R China

ISBN: (纸本)9783037853542

The ability for polymer melt to flow into the microstructure is a crucial factor for successful molding in the microinjection molding of plastic parts. In this study, a simplified analytical model with a direct hot runner nozzle and was constructed to estimate the filling percentage of mold's cavity. The filling behavior of polymer melt was observed by 3D simulation software Moldflow. The effects of the mold temperature, melt temperature, injection pressure, injection rate, and packing pressure on the filling behavior of polymer melt were investigated. Results revealed that the filling percentage increased with respect to the increase of mold temperature and melt temperature which didn't exceed its degradation temperature. The injection pressure and packing pressure dramatically influence the filling percentage, and it made no sense to lift the injection speed to fill the cavity when the injection speed reached the relatively high values, and only processing parameter combined available could guarantee the perfect flow and filling for the microstructure.

关键词： fill microinjection molding processing parameters hot runner nozzle

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Effect of processing parameters on the Microstructure of Silicon Nitride Coatings by Chemical Vapor Deposition

Effect of Processing Parameters on the Microstructure of Sil...

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1st International Conference on Sustainable Construction and Risk Management

作者： Li, Jialiang Chen, Fei Niu, Jinye Jiang, Hongyi Wuhan Univ Technol Dept Mat Sci & Engn Wuhan 430070 Peoples R China Shandong Univ Technol Dept Chem Engn Zibo 255000 Peoples R China

ISBN: (纸本)9780878493296

Silicon nitride coatings were prepared by chemical vapor deposition (CVD) method. The effect of raw precursor materials (SiH4 and NH3) ratio, gas flow amount, reaction temperature, and reaction pressure and deposition time to the microstructure, chemical compositions and crystal structures of the silicon nitride coatings are investigated The results suggest that when the SiH4 and NH3 are used as the precursors, Ar is used as the protect gas, H-2 is used as the carrier gas, the flow amount of SiH4 and NH3 is 200 seem and 1000 seem, the reaction pressure is 100 Pa, the reaction temperature is 900 degrees C and the deposition time is 30 min, the silicon nitride coatings with high deposition rate (similar to 85 angstrom/min), small grain size (similar to 0.2 mu m) and high density are obtained XRD results of the obtained silicon nitride coatings suggest their phase structure is amorphous.

关键词： Silicon nitride coating chemical vapor deposition processing parameters

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A processing parameters-microstructures diagram for the fabrication of in-situ TiCp/Fe composites

A processing parameters-microstructures diagram for the fabr...

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3rd China Cross-Strait Conference on Composite Materials

作者： Yan, YW Wei, BK Lin, HT Fu, ZY Huazhong Univ Sci & Technol State Key Lab Die Technol Wuhan 430074 Peoples R China Wuhan Univ Technol State Key Lab Adv Technol Mat Synth & Proc Wuhan 430070 Peoples R China

ISBN: (纸本)0878499261

In-situ formation of reinforcing particles from an alloy melt is one. of the most economical and practical techniques for the fabrication of particles-reinforced metal matrix composites. Some processing parameters such as the processing temperature and time of the melt and its composition have an important influence on the microstructures of the prepared composites, especially on the size, shape, volume fraction, and distribution of the synthesized particles. The main purpose of this work is to establish a processing parameters-microstructures diagram of in-situ TiCP/Fe composites. The relationship diagram obtained by a large number of quenching experiments is composed of five zones, which reveal the forming process of TiC particles in a Fe-Ti-C melt. An ideal composite microstructure can be obtained according to the processing parameters optimized by the diagram, and shows a reasonably good agreement with the predicting results. Therefore, the diagram provides an experimental basis for the optimum design of this kind of composite.

关键词： Fe-Ti-C alloy in-situ composites processing parameters microstructures relationship diagram

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Increasing mechanical properties of AA6082 by optimizing chemical compositions and processing parameters during extrusion

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Symposium on Light Metals / TMS Annual Meeting and Exhibition

作者： Tercelj, M. Fazarinc, M. Kugler, G. Perus, I. Univ Ljubljana Fac Nat Sci & Engn Ljubljana 1000 Slovenia

ISBN: (纸本)9781118291399

AA6082 aluminum alloy is used as constructional material for highly loaded automotive parts thus increasing of yield stress and ductility is of a great importance. Database of mechanical properties, processing parameters and chemical compositions for hot extruded profiles of the alloy was obtained. A CAE neural networks individual and spatial analyses was performed to determine the influences of processing parameters and alloying elements, e. g. Mg, Si, Mn, Fe, and Cu, on mechanical properties. The results of the analyses revealed a new understanding of their influences, and the possibility of increasing the mechanical properties if processing parameters and correlations between chemical elements were closer to the optimum values. Optimization was carried out in order to increase yield stress and elongation simultaneously. In practice, the obtained values for mechanical properties have confirmed the optimized values of influential parameters as correct.

关键词： AA6082 mechanical properties chemical composition processing parameters neural network

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Effects of processing parameters on the Temperature Field of Melts in Aluminothermic Reaction to Prepare Bulk Nanocrystalline Fe₃Al

Effects of Processing Parameters on the Temperature Field of...

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International Conference on Advances in Materials and Manufacturing Processes

作者： La, Peiqing Lv, Ruijiao Guo, Xin Zhang, Dan Lanzhou Univ Technol State Key Lab Gansu Adv Nonferrous Met Mat Lanzhou 730050 Peoples R China

ISBN: (纸本)9780878492015

Making use of the finite element analysis software ANSYS, we calculated the effects of different processing parameters on temperature, cooling rate and superheating time of Fe3Al melt in aluminothermic reaction to prepare bulk Nanocrystalline Fe3Al. The results showed that, with the increase of substrate thickness and reduction of reactant's quantity, cooling rate of the Fe3Al melt at the initial cooling stage became larger, while the melt purification became worse. With the increase of argon pressure, the Fe3Al melt cooled a little quicker. The cooling rate of melt cooled by glass substrate was lower than that of the melt cooled by 1045 steel and Cu substrate, while the melt purification became better. With the increase of Al2O3, Fe3Al diluents content, the cooling rate at the initial cooling stage became lower, and the melt purification became worse. The experiment verified that the calculated results were in good coincident with the experimental results.

关键词： aluminothermic reaction processing parameters cooling melt purification

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Effects of processing parameters on Temperature Distributions, Tensile Behaviour and Microstructure of Friction Stir Welding of Dissimilar Aluminium Alloys 2nd

Effects of Processing Parameters on Temperature Distribution...

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2nd International Conference on Mechanical Engineering Design, ICMechD 2019

作者： Abolusoro, Olatunji P. Akinlabi, Esther Titilayo Department of Mechanical Engineering Science University of Johannesburg Johannesburg2006 South Africa Department of Mechanical Engineering Covenant University OtaOgun State Nigeria

ISBN: (纸本)9789811547447

Research has shown that there is a correlation between process parameters, temperature variations, tensile strength, microstructures and the durability of the welds obtained in friction stir welding (FSW). The need to institute this correlation is crucial in order to achieve a weld free of defects and having sound mechanical behaviours for industrial applications. This work examines process parameters effects on variations of weld temperature, tensile strength and microstructures in dissimilar FSW of 6101-T6 and 7075-T651 aluminium alloys with a plate thickness of 6 mm. The welding was done with rotational speeds of 1250, 1550 and 1850 rpm and traverse speeds of 50 and 110 mm/min. The results obtained indicate that processing parameters significantly affect the temperature distributions in the weld. Increase in rotational speed increases the temperature but cause a decrease in tensile strength. While the increase in travel speed cause a reduction in temperature which results to increase in the tensile strength. Highest tensile strength of 143 MPa was obtained at 1250 rpm and 50 mm/min but better mixing of both materials was achieved at 1550 rpm and 50 mm/min. © 2021, Springer Nature Singapore Pte Ltd.

关键词： Aluminium Friction stir welding processing parameters Temperature

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Effects of processing parameters on corrosion properties of dissimilar friction stir welds of aluminium and copper

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Transactions of Nonferrous Metals Society of China 2014年第5期24卷 1323-1330页

作者： Esther T.AKINLABI Anthony ANDREWS Stephen A.AKINLABI Department of Mechanical Engineering Science University of JohannesburgAuckland Park Kingsway Campus Department of Materials Engineering Kwame Nkrumah University of Science and Technology School of Mechanical Industrial and Aeronautical Engineering University of Witwatersrand

The influence of friction stir welding processing parameters on dissimilar joints conducted between aluminium alloy （AA5754） and commercially pure copper （C11000） was studied. The welds were produced by varying the rotational speed from 600 to 1200 r/min and the feed rate from 50 to 300 mm/min. The resulting microstructure and the corrosion properties of the welds produced were studied. It was found that the joint interfacial regions of the welds were characterized by interlayers of aluminium and copper. The corrosion tests revealed that the corrosion resistance of the welds was improved as the rotational speed was increased. The corrosion rates of the welds compared to the base metals were improved compared with Cu and decreased slightly compared with the aluminium alloy. The lowest corrosion rate was obtained at welds produced at rotational speed of 950 r/min and feed rate of 300 mm/min which corresponds to a weld produced at a low heat input.

关键词： aluminium alloy copper corrosion friction stir weld processing parameters

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Significance-based optimization of processing parameters for thin-walled aluminum alloy tube NC bending with small bending radius

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Transactions of Nonferrous Metals Society of China 2012年第1期22卷 147-156页

作者： XU Jie YANG He LI Heng ZHAN Mei State Key Laboratory of Solidification Processing School of Matefials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072 China

Thin-walled aluminum alloy tube numerical control （NC） bending with small bending radius is a complex process with multi-factor coupling effects and multi-die constraints. A significance-based optimization method of the parameters was proposed based on the finite element （FE） simulation, and the significance analysis of the processing parameters on the forming quality in terms of the maximum wall thinning ratio and the maximum cross section distortion degree was implemented using the fractional factorial design. The optimum value of the significant parameter, the clearance between the tube and the wiper die, was obtained, and the values of the other parameters, including the friction coefficients and the clearances between the tube and the dies, the mandrel extension length and the boost velocity were estimated. The results are applied to aluminum alloy tube NC bending d50 mm×1 mm×75 mm and d70 mm×1.5 mm×105 mm （initial tube outside diameter D0 × initial tube wall thickness t0 × bending radius R）, and qualified tubes are produced.

关键词： thin-walled aluminum alloy tube optimization finite element (FE) numerical control bending processing parameters significance analysis small bending radius

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