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Evaluation of the Oxidation Reactivity and Behavior of Exhaust Soot Particles from Diesel Engines with Different Emission Levels
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作者 Wang Yajun Lin Lei +3 位作者 Xing Jianqiang LüXu Yang He Song Haiqing 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS CSCD 2024年第2期72-80,共9页
The aim of this study was to investigate the oxidation reactivity and behavior of exhaust particulate matter(PM)from diesel engines.PM samples from two diesel engines(1K,CY4102)with different emission levels were coll... The aim of this study was to investigate the oxidation reactivity and behavior of exhaust particulate matter(PM)from diesel engines.PM samples from two diesel engines(1K,CY4102)with different emission levels were collected by a thermophoretic system and a quartz filter.The oxidation reactivity,oxidation behaviors,and physicochemical properties of the PM samples were analyzed using thermogravimetric analysis(TGA),high-resolution transmission electron microscopy(HRTEM),Fourier-transform infrared spectrometry(FTIR),and Raman spectroscopy.The results showed that there was a great difference in the oxidation reactivity of soot particles emitted by the two different diesel engines.A qualitative analysis of the factors influencing oxidation reactivity showed that the nanostructure,degree of graphitization,and relative concentration of aliphatic C—H functional groups were the most important factors,whereas no significant correlation was found between the primary particle size and activation energy of the diesel soot.Based on the oxidation behavior analysis,the diesel soot particles exhibited both internal and surface oxidation modes during the oxidation process.Surface oxidation was dominant during the initial stage,and as oxidation progressed,the mode gradually changed to internal oxidation.Internal oxidation mode of soot particles from the 1K engine was significantly higher than that of CY4102. 展开更多
关键词 diesel engine soot particles oxidation reactivity oxidation behavior
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Size dependent flow behaviors of particles in hydrocyclone based on multiphase simulation 被引量:5
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作者 崔瑞 王光辉 李茂林 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第7期2422-2428,共7页
To investigate the flow behaviors of different size particles in hydrocyclone,a designed process was numerically simulated by the transient solver,where the quartz particles possessing a size distribution were injecte... To investigate the flow behaviors of different size particles in hydrocyclone,a designed process was numerically simulated by the transient solver,where the quartz particles possessing a size distribution were injected into a 100 mm diameter hydrocyclone with the steady water field and air core inside.A lab experimental work has validated the chosen models in simulation by comparing the classification efficiency results.The simulated process shows that the 25 μm quartz particles,close to the cut size,need much more time than the finer and coarser particles to reach the steady flow rate on the outlets of hydrocyclone.For the particles in the inner swirl,with the quartz size increasing from 5 to 25 μm,the particles take more time to enter the vortex finder.The 25 μm quartz particles move outward in the radial direction when they go up to the vortex finder,which is contrary to the quartz particles of 5 μm and 15 μm as they are closely surrounding the air core.The studies reveal that the flow behaviors of particles inside the hydrocyclone depend on the particle size. 展开更多
关键词 HYDROCYCLONE solid particles flow behavior computational fluid dynamics
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Microfluidic assisted 90%loading CL-20 spherical particles:Enhancing self-sustaining combustion performance 被引量:2
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作者 Ling-feng Yang Xian-rui Shi +2 位作者 Chun-zhi Li Bo Wu Chong-hua Pei 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2023年第4期176-184,共9页
The performance of the chemical fuel determines the altitude,range and longevity of spacecraft in air and space exploration.Promising alternatives(e.g.,hypergolic ionic liquids or high-energy composites)with high-ener... The performance of the chemical fuel determines the altitude,range and longevity of spacecraft in air and space exploration.Promising alternatives(e.g.,hypergolic ionic liquids or high-energy composites)with high-energy density,heat of formation and fast initial rate are considered as potential chemical fuels.As the high-energy density material,hexanitrohexaazaisowurtzitane(CL-20)often serves as secondary explosive with poor self-propagating combustion behaviors.Herein,90%loading CL-20 microspheres with uniform particle sizes are precisely prepared by microfluid method,which exhibit unique hierarchical structure.The morphology,thermal behaviors,as well as combustion performance were further investigated.The results demonstrated that as-prepared spherical particles exhibit prominent thermal compatibility,and the enhanced self-sustaining combustion performance.This work provides an efficient method achieving the uniform high-energy density particles with excellent self-sustaining combustion performance. 展开更多
关键词 MICROFLUIDICS HEXANITROHEXAAZAISOWURTZITANE Spherical particles Thermal behavior Self-sustaining combustion
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Hereditary Behavior of bar Gene Cassette is Complex in Rice Mediated by Particle Bombardment 被引量:1
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作者 赵艳 钱前 +1 位作者 王慧中 黄大年 《Journal of Genetics and Genomics》 SCIE CAS CSCD 北大核心 2007年第9期824-835,共12页
Particle bombardment transformation using minimal gene cassette (containing the promoter, open reading frame and terminator) is the novel trend in plant genetic transformation, and its use helps to alleviate the und... Particle bombardment transformation using minimal gene cassette (containing the promoter, open reading frame and terminator) is the novel trend in plant genetic transformation, and its use helps to alleviate the undesirable effects of plasmid vector backbone sequences on transgenic plants. In the present article, studies related to the hereditary behavior of bar gene cassette in T1 to T3 generations of the transgenic rice (Oryza sativa L.) lines transformed by particle bombardment have been discussed. The selectable marker bar gene cassette that integrated with the rice genome had multiple copies and showed complex segregation behaviors including the presence of ‘false homozygotes’, with abnormal segregation ratios ranging from 35:1 to 144:1 (Basta-resistant: sensitive plants) in their progenies. In five out of ten original transgenic lines, bar gene can be stably transmitted as a dominant gene to self-pollinated T2 progeny. The homozygotes were obtained in three transgenic lines in T1 generation regardless of the multiple-copy integration patterns of bar gene. Southern blotting analysis showed that multiple copies of bar gene cassette were linked, which formed transgene arrays in the host rice genome. The authors also observed stable transmission of integration patterns of bar gene cassette, as obtained from Southern blotting analysis, in the regularly segregated transgenic rice lines and loss of gene in an irregularly segregated transgenic line. The segregation behavior varied among the transgenic progenies that exhibited similar Southern hybridization patterns of bar gene. On the basis of these results, the multiple-copy integration, gene lost, and gene expres- sion interaction were the major reasons for the complex segregation behaviors of bar gene cassette in transgenic rice plants. 展开更多
关键词 bar gene cassette particle bombardment hereditary behavior RICE
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Leaching behavior of V,Pb,Cd,Cr,and As from stone coal waste rock with different particle sizes 被引量:10
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作者 Ying-bo Dong Yue Liu Hai Lin 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2018年第8期861-870,共10页
This paper investigates the leaching behavior of heavy metals(V,Pb,Cd,Cr,and As) from stone coal waste rocks with various particle sizes using dynamic leaching experiments.The results show that the dissolved concentra... This paper investigates the leaching behavior of heavy metals(V,Pb,Cd,Cr,and As) from stone coal waste rocks with various particle sizes using dynamic leaching experiments.The results show that the dissolved concentrations of V and As initially increased and then slightly decreased as time progressed and that the dissolved concentrations of Pb,Cd,and Cr were high in the early stage before decreasing.The particle size of the stone coal waste rocks strongly influenced the heavy metal concentration in the leaching solutions.The effects of the particle size of the stone coal waste rocks on the dissolved concentrations of V,Pb,and As decreased in the order fine fraction > medium fraction > coarse fraction,and the effects of particle size on the dissolved concentrations of Cr and Cd decreased in the order medium fraction > coarse fraction > fine fraction and coarse fraction > medium fraction > fine fraction,respectively.The quantities of heavy metals dissolved from the stone coal waste rock with fine particle sizes were observed to decrease in the order V(17104.36 μg/kg) > As(609.41 μg/kg) > Pb(469.24 μg/kg) > Cr(56.35 μg/kg) > Cd(27.52 μg/kg),and the dissolution rates decreased in the order As(2.96%) > Pb(0.93%) > V(0.35%) > Cd(0.25%) > Cr(0.01%).The specific surface area,pore size of the stone coal waste rocks,and chemical forms of heavy metals also influenced the release of heavy metals from the stone coal waste rocks.Kinetic analysis showed that the dissolution of heavy metals fundamentally agreed with the rate equation controlled by the shrinking core model.The results of this study are expected to serve as a reference for the evaluation of heavy metals contamination from stone coal waste rocks. 展开更多
关键词 STONE COAL WASTE ROCKS HEAVY metal LEACHING behavior dynamic LEACHING test particle size
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Coarsening behavior of γ' particles in a nickel-base superalloy 被引量:5
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作者 Li, Hongyu Zuo, Lingli +2 位作者 Song, Xiping Wang, Yanli Chen, Guoliang 《Rare Metals》 SCIE EI CAS CSCD 2009年第2期197-201,共5页
The coarsening behavior of γ particles in a nickel-base superalloy FGH95 was investigated by means of experimental observations and growth kinetics calculations. The results show that when aging at 1000,1080 and 1140... The coarsening behavior of γ particles in a nickel-base superalloy FGH95 was investigated by means of experimental observations and growth kinetics calculations. The results show that when aging at 1000,1080 and 1140°C for different times,the relation of average particle size to time obeys the cube law ( a /2)3= kt,where k is 15.49 × 103,77.5 × 103 and 230.04 × 103 nm3/min,respectively. The particle size distributions are better fit to the LSW theoretical distributions when aging at 1000°C within 1440 min.... 展开更多
关键词 nickel-base superalloys γ particles coarsening behavior particle size distribution activation energy
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Aging Behavior of High Volume Fraction SiC Particles Reinforced 2024Al Composite 被引量:2
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作者 XiufangWANG GaohuiWU +2 位作者 DongliSUN LongtaoJIANG YuanyuanHAN 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2004年第2期167-172,共6页
2024 Al matrix composite reinforced by SiC particles with 45% volume fraction and 1 um diameter was successfully fabricated by squeeze-exhaust casting method. The aging behavior of SiCp/2024AI composite at four temper... 2024 Al matrix composite reinforced by SiC particles with 45% volume fraction and 1 um diameter was successfully fabricated by squeeze-exhaust casting method. The aging behavior of SiCp/2024AI composite at four temperatures was investigated and compared to 2024 alloy. It was found that the addition of high volume fraction SiC particles does not alter the aging sequence, but it significantly accelerates the kinetics of precipitation in the composite matrices. Therefore, the aging peak of the composite appears earlier than that of 2024AI alloy. This is attributed to the decrease in the activation energy for the precipitate formation and the increase in the precipitate growth rate due to the high density dislocations in the composite with high volume fraction particles. The high density dislocations, as preferential nucleation sites for precipitates, bring about the tiny and dense precipitates in the composite. 展开更多
关键词 Squeeze-exhaust casting SiC particles COMPOSITE Aging behavior Activation energy
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Investigation on in-flight particle velocity in supersonic plasma spraying 被引量:3
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作者 李长青 马世宁 叶雄林 《China Welding》 EI CAS 2005年第1期80-84,共5页
In-flight particle velocity and flux distribution were measured using CCD thermal spray monitor system during supersonic plasma spray processing with nano-structured Al_2O_3-TiO_2 feed stocks. According to the results... In-flight particle velocity and flux distribution were measured using CCD thermal spray monitor system during supersonic plasma spray processing with nano-structured Al_2O_3-TiO_2 feed stocks. According to the results of particle flux measurement, the largest radian of the divergent particle stream is about 0.2. Within the measuring range, top speed of in-flight particles reached 800m/s. Particle acceleration was accomplished within 4cm down stream of the nozzle. Average particle velocity (about 450m/s) exceeded local sound speed (340m/s) even at a mean standoff distance of 17cm. With increasing mean standoff distance, average velocity of in-flight particle decreased according to a parabolic rule approximately. Image diagnosis showed that the result of in-flight particle velocity measurement is credible. 展开更多
关键词 SUPERSONIC plasma spraying in-flight particle VELOCITY CCD image process
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Friction behavior of Ti-30Fe composites strengthened by TiC particles 被引量:4
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作者 Sheng-hang XU Jing-wen QIU +3 位作者 Hui-bin ZHANG Hua-zhen CAO Guo-qu ZHENG Yong LIU 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2021年第4期988-998,共11页
Ti-Fe-x TiC(x=0, 3, 6, 9, wt.%) composites were fabricated through low temperature ball milling of Ti, Fe and TiC powders, followed by spark plasma sintering. The results show that β-Ti, β-Ti-Fe, η-Ti4 Fe2 O0.4 and... Ti-Fe-x TiC(x=0, 3, 6, 9, wt.%) composites were fabricated through low temperature ball milling of Ti, Fe and TiC powders, followed by spark plasma sintering. The results show that β-Ti, β-Ti-Fe, η-Ti4 Fe2 O0.4 and TiC particles can be found in the composites. The microstructure can be obviously refined with increasing the content of TiC particles. The coefficient of friction(COF) decreases and the hardness increases with increasing the content of TiC particles. The adhesive wear is the dominant wear mechanism of all the Ti-Fe-x TiC composites. The Ti-Fe-6 TiC composite shows the best wear resistance, owing to the small size and high content of TiC particle as well as relatively fine microstructure. The wear rate of the Ti-Fe-6 TiC composite is as low as 1.869× 10-5 mm3/(N·m) and the COF is only 0.64. Therefore, TiC particle reinforced Ti-Fe based composites may be utilized as potential wear resistant materials. 展开更多
关键词 TiC particle Ti-Fe based composite powder metallurgy MICROSTRUCTURE friction behavior
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Synthesis of Bowl-like Particles by Emulsion Polymerization and Release Behavior of Solvent from the Particles 被引量:1
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作者 GuangJieHAO XiaoYiSHEN ZhiWuLIANG TianYingGUO BangHuaZHANG 《Chinese Chemical Letters》 SCIE CAS CSCD 2004年第7期834-836,共3页
Bowl-like poly (styrene-co-glycidyl methacrylate) was synthesized by swollen seeded emulsion polymerization. The polymerization was carried out in PS seed emulsion swollen by toluene, whereby the bowl-like particles f... Bowl-like poly (styrene-co-glycidyl methacrylate) was synthesized by swollen seeded emulsion polymerization. The polymerization was carried out in PS seed emulsion swollen by toluene, whereby the bowl-like particles formed at last. The shape was observed by SEM. These particles became ball-like when swollen by toluene, observed by optical microscope, and the release behavior of solvent from them was examined. 展开更多
关键词 Hollow particle bowl-like particle seeded emulsion polymerization release behavior.
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Experimental Studies of the Effect of Wall Roughness on Particle Behavior in Gas-Particle Flows 被引量:1
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作者 周力行 张夏 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2004年第3期330-334,共5页
The effect of wall roughness on particle behavior in two-phase flows in a horizontal backward-facing step is studied using a phase-Doppler particle anemometer. The results show that the wall roughness widens the parti... The effect of wall roughness on particle behavior in two-phase flows in a horizontal backward-facing step is studied using a phase-Doppler particle anemometer. The results show that the wall roughness widens the particle velocity probability density distribution, enhances the redistribution of particle velocity into different directions, reduces the particle longitudinal mean velocity and increases the longitudinal and transverse fluctuation velocities and Reynolds shear stress. The effect of roughness on particle motion in the recirculation zone is weaker than that in the fully developed flow region. The effect of roughness for small particles is restricted only in the near-wall region, while that for large particles diffuses to the whole flow field. 展开更多
关键词 phase-Doppler particle anemometer measurements particle behavior wall roughness
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Effect of addition temperature on dispersion behavior and grain refinement efficiency of MgO introduced into Mg alloy
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作者 Le ZAI Xin TONG +1 位作者 Yun WANG Xiao-huai XUE 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2024年第8期2491-2506,共16页
The effect of addition temperature of MgO particles(MgOp)on their dispersion behavior and the efficiency of grain refinement in AZ31 Mg alloy was investigated.In addition,the grain refinement mechanism was systematica... The effect of addition temperature of MgO particles(MgOp)on their dispersion behavior and the efficiency of grain refinement in AZ31 Mg alloy was investigated.In addition,the grain refinement mechanism was systematically studied by microstructure characterization,thermodynamic calculation,and analysis of solidification curves.The results show that the grain size of AZ31 Mg alloy initially decreases and then increases as the MgOp addition temperature is increased from 720 to 810℃,exhibiting a minimum value of 136μm at 780℃.The improved grain refinement efficiency with increasing MgOp addition temperature can be attributed to the reduced Mg melt viscosity and enhanced wettability between MgOp and Mg melt.Furthermore,a corresponding physical model describing the solidification behavior and grain refinement mechanism was proposed. 展开更多
关键词 grain refinement MgO nucleation particles AZ31 alloy addition temperature dispersion behavior
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Motion behavior of non-metallic particles under high frequency magnetic field 被引量:1
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作者 张忠涛 郭庆涛 +3 位作者 于凤云 李捷 张剑 李廷举 《中国有色金属学会会刊:英文版》 CSCD 2009年第3期674-680,共7页
Non-metallic particles, especially alumina, are the main inclusions in aluminum and its alloys. Numerical simulation and the corresponding experiments were carried out to study the motion behavior of alumina particles... Non-metallic particles, especially alumina, are the main inclusions in aluminum and its alloys. Numerical simulation and the corresponding experiments were carried out to study the motion behavior of alumina particles in commercial pure aluminum under high frequency magnetic field. At the meantime, multi-pipe experiment was also done to discuss the prospect of continuous elimination of non-metallic particles under high frequency magnetic field. It is shown that: 1) results of numerical simulation are in good agreement with the experimental results, which certificates the rationality of the simulation model; 2) when the intensity of high frequency magnetic field is 0.06 T, the 30 μm alumina particles in melt inner could migrate to the edge and be removed within 2 s; 3) multi-pipe elimination of alumina particles under high frequency magnetic field is also effective and has a good prospect in industrial application. 展开更多
关键词 高频磁场 金属粒子 运动行为 氧化铝颗粒 工业应用前景 数值模拟 金属颗粒 仿真模型
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Particle collision behavior and heat transfer performance in a Na_(2)SO_(4) circulating fluidized bed evaporator
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作者 Feng Jiang Di Xu +2 位作者 Ruijia Li Guopeng Qi Xiulun Li 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2022年第6期40-52,共13页
The particle collision behavior and heat transfer performance are investigated to reveal the heat transfer enhancement and fouling prevention mechanism in a Na_(2)SO_(4) circulating fluidized bed evaporator.The partic... The particle collision behavior and heat transfer performance are investigated to reveal the heat transfer enhancement and fouling prevention mechanism in a Na_(2)SO_(4) circulating fluidized bed evaporator.The particle collision signals are analyzed with standard deviation by varying the amount of added particles ε(1%–3%),circulation flow velocity u(0.37–1.78 m·s^(-1)),and heat flux q(7.29–12.14 kW·m^(-2)).The results show that the enhancement factor reach up to 14.6%by adding polytetrafluoroethylene particles at ε=3%,u=1.78 m·s^(-1),and q=7.29 kW·m^(-2).Both the standard deviation of the particle collision signal and enhancement factor increase with the increase in the amount of added particles.The standard deviation increases with the increase in circulation flow velocity;however,the enhancement factor initially decreases and then increases.The standard deviation slightly decreases with the increase in heat flux at low circulation flow velocity,but initially increases and then decreases at high circulation flow velocity.The enhancement factor decreases with the increase in heat flux.The enhancement factor in Na_(2)SO_(4) solution is superior to that in water at high amount of added particles.The empirical correlation for heat transfer is established,and the model results agree well with the experimental data. 展开更多
关键词 Heat transfer enhancement particle collision behavior Circulating fluidized bed EVAPORATION NA2SO4 Standard deviation
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PREPARATION OF ULTRAFINE PARTICLE IRON-CARBONIDE CATALYST AND CHARACTERIZATION OF ITS CATALYTICAL BEHAVIOR
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作者 Jing Chang ZHANG Ming Ming WU Jing Yun LU Guang Sheng GUO Xiao Dong HE Fu Ming YANG Dept.of Appl.Chem.,Beijing Institute of Chemical Technology,Beijing 100029 《Chinese Chemical Letters》 SCIE CAS CSCD 1993年第3期275-278,共4页
Studies on ultrafine particle catalyst have attracted many researchers' attention by its large surface area,higher activity and selectivity.Based on the mechanism of α-Fe and Fe_xC_y as the catalytical active spe... Studies on ultrafine particle catalyst have attracted many researchers' attention by its large surface area,higher activity and selectivity.Based on the mechanism of α-Fe and Fe_xC_y as the catalytical active species this paper reports for the first time the preparation method of Fe_3C ultrafine parti- cle catalyst,from highly dispersed amorphous Fe powder and free carbon.The Fe powder and free car- bon,prepared by laser pyrolysis technique,was then treated by washing and heating at high tempera- ture protected with N_2.The catalyst prepared under different experimental conditions was characterazed by means of XRD,electronic diffraction and TEM.It shows that the crystlline grain size is in a range of 1-4nm and composed of Fe_3C and α-Fe.It has been found that the ultrafine particle iron-carbonide catalyst exhibited much higher activity and selectivity to light olefins.At the standard atmosphere and 380℃ reaction temperature,the conversion of CO reached a maximum of 80%. 展开更多
关键词 PREPARATION OF ULTRAFINE particle IRON-CARBONIDE CATALYST AND CHARACTERIZATION OF ITS CATALYTICAL behavior XRD Zhang ITS
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Comments on“Adsorption behavior of heavy metal ions by carbon nanotubes grown on microsized Al_2O_3 particles”
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作者 Yuh-Shan Ho 《Journal of University of Science and Technology Beijing》 CSCD 2008年第3期366-366,共1页
Recently, Hsieh and Horng [1] published the paper entitled as above. In section 3 results and discussion, the authors mentioned the first and the second order kinetic models without any quotations. In fact these two k... Recently, Hsieh and Horng [1] published the paper entitled as above. In section 3 results and discussion, the authors mentioned the first and the second order kinetic models without any quotations. In fact these two kinetic models have been published [2-5]. In order to distinguish a kinetics model based on the ad- sorption capacity of a solid from the one based on the concentration of a solution, Lagergren's first-order rate equation has been called pseudo-first-order [6-7]. The Lagergren's equation has been widely cited, but there are far more mistakes made in the quotation and in the reference section of papers, including the title, the author's name, journal title, year of publishing, volume, and page number [3]. In addition, the second order kinetic expression for the adsorption systems of divalent metal ions using sphagnum moss peat has been reported by Ho [8]. 展开更多
关键词 Adsorption behavior of heavy metal ions by carbon nanotubes grown on microsized Al2O3 particles HO RATE Comments on
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SYNTHESIS OF BOWL-LIKE PARTICLES BY EMULSION POLYMERIZATION AND RELEASE BEHAVIOR OF SOLVENT FROM THE PARTICLES
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作者 HAOGuangjie SHENXiaoyi +2 位作者 LIANGZhiwu GUOTianying ZHANGBanghua 《Chinese Journal of Reactive Polymers》 2004年第1期43-48,共6页
Poly(styrene-glycidyl methacrylate) particles having bowl-shaped hollow structures were synthesized by swollen seed emulsion polymerization. The PS emulsion synthesized through soap-free emulsion polymerization was sw... Poly(styrene-glycidyl methacrylate) particles having bowl-shaped hollow structures were synthesized by swollen seed emulsion polymerization. The PS emulsion synthesized through soap-free emulsion polymerization was swollen by toluene, and then the mixture of second monomers was added under polymerization condition. So a thin shell of poly(styrene-glycidyl methacrylate) cross-linked by triethylene glycol diacrylate was formed around the swollen PS particle. The bowl-shaped particles were obtained after the collapsing of the thin shell when the toluene emanated from the particles, but the shapes were effected by the degrees of cross-linking. The shape of the particles was observed by SEM. The release behavior of solvent from the particles was examined by TG. 展开更多
关键词 Hollow particle Bowl-like particle Shell-like particle Swollen seed emulsion polymerization Release behavior.
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Mechanical behaviors of ZL109/Al_2O_3·SiO_2 particle reinforced composites
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作者 李月英 曹占义 刘勇兵 《中国有色金属学会会刊:英文版》 CSCD 2007年第A01期290-294,共5页
The squeeze-casting method is utilized to synthesize ZL109/Al2O3·SiO2 particle reinforced composites with 5%,10%,20%,30%(volume fraction) Al2O3·SiO2 particles,respectively. The microstructures and mechanical... The squeeze-casting method is utilized to synthesize ZL109/Al2O3·SiO2 particle reinforced composites with 5%,10%,20%,30%(volume fraction) Al2O3·SiO2 particles,respectively. The microstructures and mechanical behaviors of ZL109/Al2O3·SiO2 particle reinforced composites were studied,and the mechanical properties were tested. The results show that Al2O3·SiO2 particles can be homogeneously distributed on the aluminum matrix in this process. The hardnesses of the composites are higher than that of the Al matrix,and increases with increasing the volume fraction of Al2O3·SiO2 particles. The tensile strengths and elongations of the composites are lower than that of the Al matrix,and decrease with increasing the volume fraction of Al2O3·SiO2 particles. The fracture characteristics of the composites has an obvious change with increasing the volume fraction of Al2O3·SiO2 particles on the fracture section,the toughness dens become smaller and shallower,and the tearing ridges and "rivers" pattern appear. The fracture characteristics of the composites become fragile from ductile with the increase of the volume fraction of Al2O3·SiO2 particles. Elastic moduli of the composites have little change compared with the Al matrix. 展开更多
关键词 矩阵 化合物
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The Effect of Particle Alignment on the Tensile Behaviors of Extruded Al2O3/2124 Aluminum Alloy Metal Matrix Composites
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作者 Mohamed Mahmoud Emara 《材料科学与工程(中英文A版)》 2014年第1期34-38,共5页
关键词 金属基复合材料 拉伸行为 挤压 对准 铝合金 粒子 机械性能 微观结构
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Axial segregation characteristics and size-induced flow behavior of particles in a novel rotary drum with curved sidewalls
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作者 Qiuhua Miao Wenchang Zhu +3 位作者 Yudong Cao Peng Huang Chaobin Hu Minping Jia 《Particuology》 SCIE EI CAS CSCD 2024年第4期1-19,共19页
Particle mixing and segregation are common phenomena in rotary drums,which are challenging to be controlled and driven artificially in powder technology.In this work,the discrete element method(DEM)was applied to cons... Particle mixing and segregation are common phenomena in rotary drums,which are challenging to be controlled and driven artificially in powder technology.In this work,the discrete element method(DEM)was applied to construct the novel rotary drum composed of different shaped curved sidewalls.By varying the operation parameters of particle and sidewall shapes as well as the length-to-diameter(L/D)ratio of drums,the axial mixing and segregation processes of binary size-induced particles were investigated.The results show that the axial flow velocity of the particle mixtures is noticeably weakened once the particle angularity increases,making the non-spherical particles to mix better in rotary drums compared to the spherical particles.Besides,in the short drums with size-induced spherical particles,the axial segregation characteristics are significantly enhanced by the convex sidewalls while suppressed by the concave sidewalls.However,for size-induced non-spherical particles,the axial segregation structure can be present in rotary drums with plane and concave sidewalls while not in drums with convex sidewalls.Moreover,the axial segregation band structure of spherical particles eventually increases proportionally with the increased drum L/D ratios.In contrast,the non-spherical particles cannot form obvious multi-proportional segregation bands. 展开更多
关键词 Axial flow behaviors Size-induced particles Curved sidewalls Non-spherical particles Rotary drum
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