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《中国粉体技术》2018年第24卷第3期文章摘要
作者:管理员  来源:本站原创  发布时间:2018年5月10日  点击次数:1198
煤矸石电厂灰渣改性填充聚丙烯复合材料的性能

孙志明, 郭永昌, 段永威, 杜缘生, 吴翠平, 郑水林

(中国矿业大学(北京) 化学与环境工程学院, 北京 100083

摘要:采用不同的改性剂对煤矸石电厂灰渣进行表面改性,将改性后灰渣与聚丙烯(PP)混合均匀,通过挤出注塑得到灰渣-聚丙烯复合材料,并测试其力学性能;利用SEMFT-IRDSC等分析方法,研究改性灰渣对复合材料力学性能与结晶行为的影响规律。结果表明,采用硅烷偶联剂SCA1113SCA503组成的复合偶联剂体系对灰渣改性效果最好,改性后灰渣-PP复合材料较改性前的拉伸强度由25.70 MPa增加至29.58 MPa,弯曲强度由33.60 MPa增加至35.99 MPa,冲击强度由3.04 KJ·m-2增加至3.85  KJ·m-2;改性后的灰渣在聚丙烯中起到异相成核的作用,使聚丙烯的结晶温度提高,结晶速率增大,微晶尺寸分布变窄。

关键词:煤矸石电厂; 灰渣; 聚丙烯; 硅烷偶联剂; 力学性能

中图分类号:TQ327    文献标志码:A

文章编号:1008-5548201803-0001-06

Properties of modified coal gangue power plant ash filled polypropylene composite materials

SUN ZhimingGUO Yongchang DUAN YongweiDU Yuansheng WU Cuiping ZHENG Shuilin

 College of Chemical and Environmental EngineeringChina University of Mining and Technology Beijing),Beijing 100083 China

Abstract Ultra-fine coal gangue power plant ash was modified with different surface modification agent and blended with polypropylenePP. Ash-PP  composite  material was obtained by extrusion and injection molding and its mechanical properties were also measured. The effects of modified ash on the mechanical properties and crystallization behavior of composite materials were studied by the SEM FT-IR and DSC. The results show that the modification effect of silane coupling agent SCA1113 and SCA503 are optimal. The tensile strength the bending strength and the impact strength increase from 25.70 to 29.58 MPa 33.60 to 35.99 MPa and 3.04 to 3.85  KJ·m-2 respectively. The modified ash in the composite plays an important role in the polypropylene because of heterogeneous nucleation effect to increase the crystallization temperature of polypropylene and the crystallization rate and decrease the crystallite size distribution.

Keywords gangue power plant ash polypropylene silane coupling agent mechanical property

 

稀土有机配合物荧光材料的研究进展

刘 斌, 段广彬, 刘宗明

(济南大学 材料科学与工程, 山东 济南 250022

摘要:概述稀土有机配合物的荧光发光机理,即有机配体通过对稀土离子的敏化作用,并将其跃迁的能量传递给稀土离子供其发光;列举芳香胺类、β-二酮类和多胺多羧酸类等新型的有机配体结构。提出稀土有机配合物材料的研究与应用应致力于研发高性能有机配体,并着手解决极易被水猝灭和量子产率不高等问题。认为合成平面刚性强并对稀土离子进行有效保护的新型有机配体,可以有效增强稀土有机配合物的荧光强度以改善其应用范围。

关键词:稀土有机配合物; 有机配体; 敏化作用; 荧光性能

中图分类号:TQ422    文献标志码:A

文章编号:1008-5548201803-0006-06

Research progress of rare earth organic complex fluorescent materials

LIU Bin DUAN Guangbin LIU Zongming

School of Material Science and EngineeringUniversity of Jinan Jinan 250022 China

Abstract The luminescence mechanism of rare earth organic complexes is summarized. Organic ligands are sensitized to rare earth ions and their transition energy is transferred to rare earth ions for their luminescence. Several novel organic ligands such as aromatic amines β-diketones and polyamine polycarboxylic acids are listed. The research and application of rare earth organic complexes should be devoted to the development of high performance organic ligands. It is considered that new organic ligands with strong plane rigidity and effective protection of rare earth ions can be synthesized by solving the problems of easily quenched by water and low quantum yield. It can effectively enhance the fluorescence intensity of rare earth organic complexes and improve their application scope.

Keywords rare earth organic complexes organic ligandsensitization fluorescence property

 

气流粉碎干燥制备超细磷酸铁锂粉的工艺

张明宇1a 刘侹楠1b 黄生龙1b 吕 娟2 陈海焱1b

1. 西南科技大学 a. 土木工程与建筑学院; b. 环境与资源学院, 四川 绵阳 621000

 2. 绵阳流能粉体设备有限公司, 四川 绵阳 621000

摘要:采用LNJST-120HT型闭路循环氮气保护气流粉碎分级系统对磷酸铁锂粉进行超细加工、 干燥; 对粉碎、 分级、 收集、输送和包装系统的操作参数、设备结构及系统运行过程中出现的流动性、水分增加等问题进行分析探讨,并优化改进;通过加工超细磷酸铁锂粉的工业试验,对改进后的超音速气流磨进行测试。结果表明,控制螺杆加料机和分级机转速分别为621 072 r/min,气源压力和温度分别为0.5 MPa120 ℃,包装房露点温度控制在-20 ℃以下,磷酸铁锂粉成品水分含量维持在0.35 ~0.55 ‰,成品粒径d50=0.8~1.2 μmd1008 μm,产量为200~230 kg/h

关键词:闭路系统; 超音速气流磨; 磷酸铁锂粉

中图分类号:TQ110.6    文献标志码:A

文章编号:1008-5548201803-0011-06

Preparation of ultrafine lithium iron phosphate powder by airflow crushing and drying

ZHANG Mingyu1a LIU Tingnan1bHUANG Shenglong1b LYU Juan2 CHEN Haiyan1b

 1. a. School of Civil Engineering and Architectureb. School of Environment and Resource

Southwest University of Science and Technology Mianyang 621000 China 2Mianyang Liuneng Powder Equipment Co.Ltd. Mianyang 621000 China

Abstract According to the moisture absorption of ultrafine lithium iron phosphate powder and its crushing requirements the LNJST-120HT closed-cycle airflow grinding and grading system with nitrogen gas protection were applied to the superfine processing and drying of the lithium iron phosphate powder. The operating parameters and equipment structure in the system of grinding grading collecting packaging and transporting were analyzed and improved. Meanwhile the liquidity and moisture content of the powder in the running process were also studied. Through the industrial test of processing ultrafine lithium iron phosphate powder investigation on the improved supersonic jet milling was adopted. The results show that when the rotational speed  of the screw feeding machine and the classifier are 62  and 1 072 r/min respectively the air pressure and temperature are 0.5 MPa and 120 ℃, and the dew point of the packing room is controlled below -20 ℃, the moisture content of lithium iron phosphate powder is maintained from 0.35 to 0.55 ‰, the mean particle sized50 is 0.8~1.2 μm the maximum particle size d100 is smaller than 8 μm and the powder yield is 200~230 kg / h.

Keywords closed system supersonic jet milling lithium iron phosphate powder

 

氧化石墨的制备及应用

朱碧馨, 毋 伟

(北京化工大学 教育部超重力工程研究中心, 北京 100029

摘要:综述制备氧化石墨的Brodie法、Staudenmaier法、Hummers法等化学氧化方法,以及利用水溶液电解质、离子液体电解质的电化学氧化法等,总结其反应原理及其优缺点;概括氧化石墨(烯)在模板材料、废水处理、脱盐作用、生物材料和电池材料等领域的应用。提出石墨烯具有良好理化性能,在能源、化学等领域应用前景广阔,且氧化石墨合成技术起着决定性作用;对于不同的目标产物,有针对性地设计功能化复合材料,实现对目标物高效作用,将在复合材料领域发展空间广阔。

关键词:氧化石墨; 化学氧化; 电化学氧化

中图分类号:TQ 127.1+1     文献标志码:A

文章编号:1008-5548201803-0015-06

Preparation and application of graphite oxide

ZHU Bixin WU Wei

Research Center of the Ministry of Education for High Gravity Engineering and technology Beijing University of Chemical Technology Beijing 100029 China

Abstract Chemical oxide methods of preparing graphite oxide like Brodie method Staudenmaier method and Hummers method as well as electrochemical oxide methods in aqueous electrolyte and ionic liquid electrolyte were reviewed together with the reaction principle and evaluation for advantages and disadvantages. Then the application of graphite oxide graphene oxide in many fields such as template wastewater desalination biological and battery materials were summaried. It is  prospected that with good physical and chemical propertiesgraphene is widely used in energy and chemistry fields so the synthesis of graphite oxide plays a decisive role in the process. High efficiency on target will be achieved with designed targeted functional composite materials for different target products which will lead the vast development for graphite products.

Keywords graphite oxide chemical oxidation electrochemical oxidation

 

WPP-MSS-POE-g-MAH复合材料的制备及表征

赵梅杰, 吴 曼, 刘新民, 郭庆杰

(青岛科技大学 化工学院; 清洁化工过程山东省高校重点实验室, 山东 青岛 266042

摘要:为提高废旧聚丙烯(WPP-高梁秸秆粉(SS)复合材料的冲击强度和阻燃性能,以硅烷KH550-钛酸酯TCA201复合偶联剂改性SSMSS),并在WPP-MSS中加入POE-g-MAH进行增强增韧;通过FTIRXRDTG对改性前后的SS进行表征,并考察SS 复合偶联剂及POE-g-MAH用量对复合材料性能的影响;借助热重-红外联用研究WPP-MSS-POE-g-MAH复合材料的热解特性。结果表明:经质量分数为2% KH550-TCA201复合偶联剂改性后, 复合材料达难燃级别,冲击强度提高49%;当mWPP:mMSS:mPOE-g-MAH)=100308时,复合材料的冲击强度增幅达135.6%;复合材料的热解气在280 ℃以后释放,主要为烷烃、烯烃、CO2等,同时还有少量醛、酮类气体。

关键词:木塑复合材料; 表面改性; 热解

中图分类号:X783.2     文献标志码:A

文章编号:1008-5548201803-0022-00

Preparation and characterization of  WPP-MSS-POE-g-MAH composites

ZHAO Meijie WU Man LIU Xinmin GUO Qingjie

Key Laboratory of Clean Chemical Processing of Shandong Province College of Chemical Engineering Qingdao University of Science & Technology Qingdao 266042 China

Abstract In order to improve the impact strength and flame retardance of waste polypropylene WPP-sorghum straw powder SS composites the SS was modified by Silane KH550- Titanate TCA201 composite coupling agent and then POE-g- MAH was added into the WPP- MSS composites. The SS before and after modification were characterized by FTIR XRD and TG. The effects of SS composite coupling agent and POE- g- MAH on the properties of the composites were investigated. The pyrolysis characteristics of WPP- MSS- POE- g- MAH were studied by means of TG- FTIR at nitrogen  atmosphere.  The  results show that after modification by 2% KH550- TCA201 the WPP-MSS composites is nonflammable and the impact strength of the composites is increased by 49%. When mass ratio of WPP to MSS and to POE- g- MAH are 100 30 and 8 the impact strength of the composites is increased by 135.6%. The pyrolysis gas of the composite material is released after 280 ℃, mainly for alkanes olefins CO2 etc. whereas a small amount of aldehydes and ketones are produced in the pyrolysis process.

Keywords: wood-plastics composites surface modification pyrolysis

 

钛粉的最小点火能

董海佩1 程贵海1 李晓泉1 徐中慧2

1. 广西大学 资源与冶金学院, 广西 南宁 530004 2. 西南科技大学 环境与资源学院, 四川 绵阳 621010

摘要:使用哈特曼管,对5种粒径的钛粉进行最小点火能(Emin)实验;选取喷尘压力(p)、紊流指数(tv)处于敏感值的数据拟合出钛粉点火能量(Ei)受质量浓度和粒径影响变化的函数,以及敏感质量浓度受粒径影响变化的函数。结果表明:中位粒径为1825384874 μm的钛粉对应的敏感质量浓度分别为700750 800800850 g/m3,最小点火能分别为33.238.141.344.367.4 mJ;点火能量随质量浓度的增大以二次函数的形式先减后增,随粒径的增大以二次函数的形式增大;敏感质量浓度与钛粉粒径呈正相关;紊流指数敏感值与喷尘压力呈负相关;喷尘压力不变,粒径越大,紊流指数敏感值越大;紊流指数不变,钛粉粒径越大,喷尘压力敏感值越大。

关键词:钛粉; 最小点火能; 粒径; 质量浓度; 喷尘压力; 紊流指数

中图分类号:X932     文献标志码:A

文章编号:1008-5548201803-0030-00

Minimum ignition energy of titanium powder

DONG Haipei1 CHENG Guihai1 LI Xiaoquan1 XU Zhonghui2

 1. School of Resources and MetallurgyGuangxi UniversityNanning 530004China 2. School of Resources and Environmental Southwest University of Science and Technology Mianyang 621010 China

Abstract   The Hartmann tube was used in experiment with the spherical titanium powder of five different particle sizes. The data of dispersion pressurep), turbulent flow indextv in the sensitive value were selected to fit out the function between the ignition energy Ei and concentration particle size and the function between the sensitive concentration and the particle size. The results show that the sensitive concentration of the titanium powder corresponding to the average size of 18 25 38 48 74 μm are respectively 700750800800 and 850 g/m3 the minimum ignition energy were 33.238.141.344.3 and 67.4 mJ respectively. The ignition energy decrease first and then increase with the increase of concentration in the form of quadratic function and increase with the increase of the particle size in the form of quadratic function. The sensitive concentration is positively related to the particle size of titanium powder and the sensitivity of turbulent flow index is negatively related to the dispersion pressure. When the dispersion pressure is constant the larger the particle size the greater the sensitivity of the turbulent flow index. When the turbulent flow index is constant the larger the particle size of titanium powder the greater the sensitive value of the dispersion pressure.

Keywords: titanium powder minimum ignition energy particle size concentration dispersion pressure turbulence flow index

 

旋转流场式陶瓷干法制粉造粒立柱直径对粉体级配的影响

吴南星, 赵增怡, 花拥斌, 程章云, 刘玉涛, 廖达海

(景德镇陶瓷大学 机械电子工程学院, 江西 景德镇 333403

摘要:基于CFD方法构建旋转流场式陶瓷干法制粉混料过程欧拉-欧拉双流体模型,模拟分析粉体体积分布情况,确定旋转流场式陶瓷干法制粉造粒立柱直径对粉体级配的影响。结果表明:当造粒立柱直径φ为70 mm时,粉体体积分布约为51%,轴向云图粉体堆积度最大为0.50,径向云图粉体最大堆积度为0.45,堆积范围最小,制粉室内无明显堆积现象,粉体级配最均匀;有效粉体占坯料粉体的比例最大为87%,且有效粉体粒径呈正态分布,此时粉体级配最为均匀。

关键词:干法制粉; 造粒立柱; 欧拉-欧拉双流体模型; 粉体级配

中图分类号:TQ174.5     文献标志码:A

文章编号:1008-5548201803-0034-06

Influence of prilling column diameter on powder grading in ceramic dry granulation by rotating flow field

WU Nanxing ZHAO Zengyi HUA Yongbin CHENG Zhangyun LIU Yutao LIAO Dahai

 School of Mechanical and Electronic EngineeringJingdezhen Ceramic Institute Jingdezhen 333403 China

Abstract Eulerian-Eulerian two fluid models for rotating flow field ceramic dry granulation mixing process was established based on CFD method the volume distribution of powders was simulated and the influence of the column diameter of the rotating flow field dry ceramic powder granulation method on the particle size distribution was determined. The results show that when the diameter of granulation column is 70 mm the volume distribution of powder volume is approximately 51% the axial cloud image powder has the maximum accumulation degree of 0.50 and the maximum accumulation degree of the radial cloud is 0.45 the accumulation scope is the smallest. There is no obvious accumulation in the powder room the powder level is the most uniform. The experimental results show that the ratio of the effective powder to the blank powder is 87% and the effective particle size is normal distribution. At this point the powder grading is the most uniform.

Keywords dry granulation prilling column Eulerian-Eulerian two fluid models powder grading

 

复合分散剂液体磁性磨具的分散机理

李唯东, 张 再, 李文辉, 杨胜强

(太原理工大学 机械工程学院; 精密加工山西省重点实验室, 山西 太原 030024

摘要:为提高水基液体磁性磨具的稳定性,选定六偏磷酸钠(SHMP)与聚丙烯酸(PAA)作为复合分散剂,纳米二氧化硅为辅剂,对悬浮液中固相颗粒表面进行改性,并研究其影响稳定性机理;对单个固相粒子进行微观分析,表征其物理特性,同时以沉降率和零磁场黏度为指标研究改性后的水基液体磁性磨具的稳定性。结果表明:六偏磷酸钠、PAA与纳米二氧化硅最佳的配方比例大致为0.190.400.41,稳定性最好。

关键词:液体磁性磨具;稳定性;复合分散剂

中图分类号:TG669     文献标志码:A

文章编号:1008-5548201803-0039-06

Dispersion mechanism of compound dispersant fluid magnetic abrasives

LI Weidong ZHANG ZaiLI Wenhui YANG Shengqiang

 School of Mechanical EngineeringShanxi KeyLaboratory of Precision Machining Taiyuan University of Technology Taiyuan 030024China

Abstract In order to improve the stability of water-based fluid magnetic abrasives sodium hexametaphosphate SHMPand PAA were selected as complex dispersants nano-SiO2 was used as a adjuvant. The surface of solid phase particles in suspension was modified and the mechanism of its stability was studied. The single solid particles were analyzed to characterize its physical properties on a micro level and the stability of the modified water-based fluid magnetic abrasives was studied with sedimentation rate and zero magnetic field viscosity as an index. The results show that the optimum formula ratio of sodium hexametaphosphate PAA and nano-SiO2 is 0.19:0.40:0.41 and its stability is the best.

Keywords fluid magnetic abrasives stability compound dispersant

 

循环流化床锅炉后补燃风掺混的试验与数值模拟

武广龙12 周 托1 那永洁12 涂秋亚1

1. 中国科学院 工程热物理研究所, 北京 100190 2. 中国科学院大学 工程科学学院, 北京 100049

摘要:针对冷态模拟试验台,利用计算流体力学方法研究后补燃风喷嘴布置高度、喷嘴数量以及后补燃风比例对后补燃风与一次风掺混效果的影响;采用Realizable k-ε湍流模型计算不同截面上的速度,并与冷态模拟试验台上的试验结果进行比较。结果表明:计算值与试验结果吻合;后补燃风喷嘴布置在试验段烟道下部、中部及以上时掺混相关系数稳定在0.6左右;喷嘴布置在试验段烟道下部时减少喷嘴数量,布置在上部时增加喷嘴数量,底部和上部增加后补燃风比例会均能提高掺混效果。

关键词:循环流化床锅炉; 后补燃风; 氮氧化物; 掺混; 数值模拟

中图分类号:X773    文献标志码:A

文章编号:1008-5548201803-0043-06

Experiment and numerical simulation of air mixing for post-combustion at circulating fluidized bed boiler

WU Guanglong12 ZHOU Tuo1NA Yongjie12 TU Qiuya1

 1. Institute of Engineering Thermophysics Chinese Academy of Sciences Beijing 100190 China 2. School of  Engineering Science University of Chinese Academy of Sciences Beijing 100049 China

Abstract Factors of influencing mixing effect of post-combustion air such as the position of  post-combustion air nozzles the number of nozzles and the proportion of post-combustion air  were studied  using computational fluid dynamics method. The velocity in different section planes with Realizable k-ε turbulent model was compared with the experimental data on a cold simulation test platform. The results indicate that the numerical results agree well with the experiments. When the post-combustion nozzle is arranged on the lower part of the test section flue and above of it the mixing correlation coefficient is about 0.6. When the nozzles are arranged on the lower part of the flue they are better to reduce the nozzles number to increase the momentum ratio. To the upper part of the flue it needs to increase the number of nozzles to increase the jet area. Increasing the proportion of the post-combustion air in the bottom and the upper part of the flue will improve the mixing effect.

Keywords circulating fluidized bed boiler post-combustion airnitrogen oxides mixing numerical simulation

 

大同煤循环流化床的O2-CO2预热特性

朱建国, 马洪洲, 柳殿彬, 吕清刚

1. 中国科学院 工程热物理研究所, 北京 100190 2. 中国科学院大学 工程科学学院, 北京 100049

摘要:利用循环流化床高温预热技术,对大同煤在O2-CO2环境下预热前后的颗粒特性、燃料特性和燃料氮的转化特性开展研究。结果表明,循环流化床可将大同煤稳定预热至850 ℃,预热所需的热量全部由煤粉自身的部分燃烧提供。预热后的半焦颗粒粒径减小,比表面积和孔容积分别增大102倍,孔隙结构更加发达;大同煤在循环流化床O2-CO2预热中,煤气中COH2 CH4CO2体积分数分别为11.5 % 9.7 % 2.11 %79.6 % 煤气热值为2 848.7 kJ·m-3 预热过程,煤中的N-QN-XN-6N-5发生了转化,N-6质量分数由原煤的17.28 %增大到32.11 %

关键词:大同煤; 循环流化床; O2-CO2 预热

中图分类号:TK16    文献标志码:A

文章编号:1008-5548201803-0052-06

Preheating characteristics of Datong coal in circulating fluidized bed with O2-CO2 atmosphere

ZHU Jianguo MA Hongzhou LIU Dianbin LYU Qinggang

 1. Insititute of Engineering Thermophysics Chinese Academy of Sciences Beijing 100190 China  2. School of Engineering Sciences University of Chinese Academy of Sciences Beijing 100049 China

Abstract The particle characteristics fuel characteristics and fuel-nitrogen conversion characteristics of Datong coal in the O2-CO2 environment were studied using the high temperature preheating technology of circulating fluidized bed. The results show that Datong coal can be preheated to 850 steadily by circulating fluidized bedand the required heat to preheat is all provided by partial combustion of pulverized coal. After preheating the particle size of semi-coke decreases the specific surface area and the pore volume increase by 10 and 2 times respectively and the pore structure becomes developed. 72.10 % of  carbon  and  54.99 %  of  nitrogen  are  converted  to  the  gas respectively  during  the  process  of  preheating  of  Datong  coal by  circulating  fluidized  bed  in  O2-CO2  environment.  The concentrations of CO H2 CH4 and CO2 in gas are 11.5 % 9.7 % 2.11 % and 79.6 % respectively and the gas heating value reaches 2 848.7 kJ·m-3. N-Q and N-X in coal are converted to N-6 and N-5 and the mass fraction of N-6 increase from 17.28 % to 32.11 %.

Keywords: Datong coal circulating fluidized bed O2-CO2 preheating

 

金属纳米粒子修饰的石墨烯加强铜基复合材料

冯亚鹏a 李美霞b

(河北工程大学 a. 机械与装备工程学院; b. 材料科学与工程学院, 河北 邯郸 056038

摘要:利用镍纳米粒子修饰石墨烯(GPLs)制备石墨烯镍纳米粒子复合物(Ni-GPLs);将复合物作为增强相作用于Cu基体(Ni-GPLs-Cu),研究其力学性能;采用SEM、TEMXRDFT-IRXPS等对Ni-GPLs进行表征。结果表明:Ni-GPLs由附着在GPLs上且分散均匀的镍纳米颗粒构成,镍离子通过化学还原在GPLs表面合成Ni-GPLs;含有体积分数为0.8% Ni-GPLsNi-GPL-Cu复合材料的极限抗拉强度(UTS)显著提高,比纯Cu的高出42%,大大提高Ni-GPLs-Cu的力学性能。

关键词:石墨烯纳米片; 金属纳米粒子; 金属基复合材料; 镍纳米颗粒

中图分类号:TB333     文献标志码:A

文章编号:1008-5548201803-0058-06

Highly enhanced mechanical properties in Cu matrix composites reinforced with graphene decorated metal nanoparticles

FENG Yapenga LI Meixiab

 a. School of Mechanical and Equipment Engineering b. School of Materials Science and Engineering Hebei University of Enginerring Handan 056038 China

Abstract Preparation and mechanical performance of graphene-metal composites were studied using Ni nanoparticles decorated graphene nanoplatelets Ni-GPLs as a reinforcing component in Cu matrix Ni-GPLs-Cu. SEM TEM XRDFT-IR and XPS were used to characterize Ni-GPLs. The results show that Ni-GPLs consisting of well-dispersed Ni nanoparticles strongly attached on GPLs are successfully synthesized by chemically reducing Ni ions on the surface of GPLs. The Ni-GPL-Cu composites with only 0.8 vol.% Ni-GPLs exhibite a significant improvement in ultimate tensile strength UTS), being 42 % higher than that of monolithic Cu. Ni-GPLs are novel and effective reinforcing components for greatly improving the mechanical properties of the graphene-metal composites.

Keywords graphene nano-platelets metal nano-particles metal matrix composites nickel nano-particles

 

中国区域MODIS AODPM2.5小时质量浓度的相关性分析

梁延飞12 臧增亮1 尤 伟1 王伟齐3

(1. 国防科技大学 气象海洋学院, 江苏 南京 211101 2. 中国人民解放军32145部队, 河南 新乡 453000 3. 中国人民解放军66199部队 北京 100100

摘要:利用20152016年中国大陆区域Terra卫星的MODIS 3 km AOD产品与空气质量监测站的PM2.5资料,将AODPM2.5小时质量浓度数据进行匹配,按多种时空划分方式将总匹配样本划分为不同集合,对比不同集合内样本的相关系数,分析AODPM2.5相关性的时间和空间变化。结果表明,总样本集合AODPM2.5的相关系数为0.40;中国区域春、 夏、 秋、 4个季节的样本集合,相关系数分别为0.49 0.53 0.48 0.36 1 497个站点的2年样本集合,有906个站点的相关系数可以通过0.05水平的显著性检验,最大值为0.92,最小值为0.17,均值为0.441 497个站点的不同季节的样本集合,春、夏、秋、冬相关性显著的站点比例分别为43.9%51.3%39.8%10.1%,夏季的显著性站点数量最多、分布地域最广,且相关系数均值较高。表明在中国地区,虽然在总体上可以有效利用MODIS 3 km AOD反演PM2.5小时质量浓度,但反演的有效性存在明显的时间和空间差异。

关键词:气溶胶光学厚度; 细颗粒物; 小时质量浓度; 相关性

中图分类号:X513     文献标志码:A

文章编号:1008-5548201803-0063-06

Correlation between MODIS AOD and hourly mass concentrations of PM2.5 in China

LIANG Yanfei12 ZANG Zengliang1YOU Wei1 WANG Weiqi3

 1. Institute of Meteorology and Oceanography National University of Defense Technology Nanjing 211101China 2. No.32145 Unit of PLA Xinxiang 453000 China 3. No.66199 Unit of PLA Beijing 100100 China

Abstract Using MODIS 3 km AOD products from satellite Terra and mass concentrations of PM2.5 in air quality monitoring stations over the mainland China from 2015 to 2016 the AOD and PM2.5 hourly mass concentration data were matched and the total matching samples were divided into different sets. By comparing the correlation coefficients of the samples in different sets the temporal and spatial changes of the correlation between AOD and PM2.5 were analyzed. The results show that the correlation coefficient between AOD and PM2.5 is 0.40 for the overall sample set within two years in China and the correlation are 0.49 0.53 0.48 and 0.36 for the sample sets of spring summer autumn and winter in China respectively. For the 2-year sample set of each of the 1497 sites the correlation coefficient of 906 sites can pass the significance test of 0.05 level the maximum value is 0.92 the minimum value is 0.17 and the mean value is 0.44. For 1 497 sites in different seasons the proportion of sites with significant correlations in spring summer autumn and winter are 43.9% 51.3% 39.8% and 10.1% respectively. The number of significant sites in summer is the largest with the largest geographical distribution and the mean of correlation coefficients is high. It is indicated that in China although the MODIS 3 km AOD can be effectively used to retrieve PM2.5 hourly mass concentration the effectiveness of the inversion has obvious time and spatial difference.

Keywordsaerosol optical depth particulate matter hourly mass concentration correlation

 

标准粒子发生器系统的粒子发生规律

詹永波, 张健伟, 曾建雄, 石先城

(广东环凯微生物科技有限公司, 广东 广州 510663

摘要:为了给激光尘埃粒子计数器提供可靠的校准、标定依据,研究0.296 0.498 1.019 2.995 μm 4种标准粒子在不同稀释液喷射流量和粒子数下的分布规律,分析粒子发生系统中粒子数随工作时间的变化关系,探讨粒子计数器校准中的2种测量方法。结果表明,随粒子粒径的增加,测量粒子数所占总粒子数分数逐渐下降;前3种标准粒子具有稳定分布,后一种分布不稳定,且测量粒子数所占总粒子数分数与稀释液的喷射流量和浓度无关;粒子发生系统的稳定时间约为10 min;不同流量计数器比较校准时,前3种标准粒子适用于双管同时测量的方法,后一种适用于单管分时测量的方法。

关键词:标准粒子; 分布规律; 粒子发生系统; 双管同时测量; 单管分时测量

中图分类号:TH89     文献标志码:A

文章编号:1008-5548201803-0069-06

Particles occurrence regularity of standard particle generator system

ZHAN Yongbo ZHANG JianweiZENG Jianxiong SHI Xiancheng

 Guangdong Huankai Microbial Sci. &Tech. Co.Ltd.Guangzhou 510663 China

Abstract In order to provide the reliable calibration rules for laser dust particles counter the standard particles distribution rule of 0.2960.4981.019 and 2.995 μm were studied under the conditions of different diluents jet flow and particles concentration. The particles concentration as a function of working time was analyzed by the particles generation system. Two calibration methods of particles counter were discussed. The results show that the percentage of measured particles descends with the increase of particles size. The distributions of the first three standard particles are stable compared to the latter. The percentage of measured particles are independent of diluents jet flow and particles concentration. The settling time of particles occurrence system is about 10 minutes. The first three standard particles are suitable for double tube simultaneous measurement and the latter is suitable for single tube time-sharing measurement in the comparison calibration of different flow particles counter.

Keywords standard particles distribution rule particles generation system double tube simultaneous measurement single tube time-sharing measurement

 

盆地城市地气温差变化特征及对颗粒物浓度的影响

王 超1 肖天贵1 罗 琴2 吴利彬2 刘雅静1 文晓航1

1. 成都信息工程大学 大气科学学院; 高原大气与环境四川省重点实验室, 四川 成都 6102252. 成都市温江气象局, 四川 成都 610000

摘要:观测四川盆地典型城市成都连续5a逐小时的地表温度(Ts)、气温(Ta)及其颗粒物(PM10PM2.5 质量浓度等,分析地气温差(Ts-Ta)的变化特征及其对颗粒物质量浓度的影响。结果表明:平均地气温差为2.01 ℃,地气温差0.3~1.2 ℃,变化幅度较小;地气温差年变化最大时出现在4月,最小时出现在11月,三次拟合曲线可以较好地模拟成都温差的年变化特征;地气温差日变化显著,在不同季节中变化趋势大致相同,极值大小差异较大,分段拟合对温差日变化特征模拟较好;颗粒物污染明显,地气温差较小时,颗粒物质量浓度偏大,反之偏小。

关键词:盆地城市; 地气温差; 大气颗粒物

中图分类号:P421.1    文献标志码:A

文章编号:1008-5548201803-0076-06

Variations of difference between surface temperature and air temperature and its impact on aerosol concentration in basin city

WANG Chao1 XIAO Tiangui1 LUO Qin2WU Libin2 LIU Yajing1 WEN Xiaohang1

 1. College of Atmospheric Sciences Plateau Atmosphere and Environment Key Laboratory of Sichuan Province Chengdu University of Information Technology Chengdu 610225 China

2. Wenjiang Meteorological Bureau Chengdu 610000 China

Abstract With the hourly data of land surface temperature Ts), air temperatureTa and aerosol mass concentration the characteristics of the difference between surface temperature and air temperatureTs-Ta and its impacts on aerosol concentration were studied. The results show that the average air temprature is 2.01 and the distribution of average air temperature is 0.3~1.2. The maximum value of Ts-Ta appeares in April while the minimum in November. The annual change variations are fitted well by cubic curve fitting equation. Diurnal variation of Ts-Ta is significant. Although the variations in four seasons have similarly changing tendency the extremum values are different. The aerosol pollution in Chengdu is serious. The effects of Ts-Ta on aerosol concentration is significant the greater the Ts-Ta), aerosol concentration is low otherwise the reverse.

Keywords basin city differences between ground and air temperatures aerosol

 

基于衬板参数的半自磨机破碎能耗分析

宗 路, 郭 晋, 蔡改贫, 肖贤煌, 王 俊

(江西理工大学 机电工程学院, 江西 赣州 341000

摘要:为研究半自磨机衬板结构参数对磨矿性能的影响,对半自磨机内部各区域的载荷颗粒进行动力学分析,建立基于衬板参数的半自磨机有用功率数学模型,分析衬板的数量、高度、宽度对破碎性能的影响规律;利用离散元软件EDEM和二次开发对半自磨机磨矿过程进行数值模拟,分析衬板结构参数对粘结颗粒(物料)断裂键数量的影响,并通过实验进一步验证了半自磨机有用功率的可靠性及最佳衬板结构参数的准确性。结果表明,当半自磨机衬板数量为32,高度为17 mm,宽度为20 mm时,磨矿性能最佳,与模型的分析结论相符。

关键词:半自磨机; 衬板结构; 磨矿性能; 数值模拟

中图分类号:TD453    文献标志码:A

文章编号:1008-5548201803-0081-06

Analysis of crushing energy consumption of semi-autogenous mill based on liner parameters

ZONG Lu CUO Jin CAI GaipinXIAO Xianhuang WANG Jun

 School of Mechanical and Electrical Engineering Jiangxi University of Science and Technology Ganzhou 341000 China

Abstract In order to study the influence of structural parameters of semi-autogenous mill liner on grinding performance the dynamic analysis of load particles in each region of semi- autogenous mill was carried out. The mathematical model of the useful power of semi-autogenous mill based on the parameters of liner was established and the influence of number height and width of the liner on crushing performance was analyzed. The numerical simulation of grinding process of semi-autogenous mill was carried out using discrete element software EDEM and its two development. The influence of structural parameters of liner on the number of broken bond of bonded particle material was analyzed. The results show that the grinding performance is the best when the number of liner is 32 the height is 17 mm and the width is 20 mm which is consistent with the analysis conclusion of the mode. The reliability of useful power of the semi-autogenous mill and the accuracy of the optimum liner structure parameters are further verified by experiments

Keywords semi-autogenous mill lining structure grinding performance numerical simulation

 

制备条件对镥铝石榴石纳米粉体合成的影响

邢 琳, 王聪慧, 罗银燕, 杨林峰

(中原工学院 理学院, 河南 郑州 450007

摘要:采用溶剂热法研究起始材料硝酸镥(LuNO33·6H2O)和硝酸铝(AlNO33·9H2O)中结晶水去除前后对镥铝石榴石(LuAG)纳米粉体合成的影响;比较高温热处理对LuAG纳米粉体合成的影响;利用X射线衍射仪、红外光谱仪、透射电子显微镜分析所得粉体的物相组成、微观形貌和分散情况。结果表明,对于含结晶水的起始材料采用溶剂热法能够合成纯相的LuAG纳米粉体,颗粒尺寸为100 nm左右且具有较好的分散性;高温热处理后,纳米粉体结构趋于完整,但纳米颗粒有团聚现象。认为原材料中结晶水的去除不利于溶剂热法合成LuAG纳米粉体,而高温热处理所得的LuAG纳米粉体均已结晶。

关键词:镥铝石榴石; 纳米粉体; 结晶水; 溶剂热法; 热处理

中图分类号:O611.4     文献标志码:A

文章编号:1008-5548201803-0088-06

Effect of preparation conditions on synthesis of Lu3Al5O12 nanopowders

XING Lin WANG ConghuiLUO Yinyan YANG Linfeng

 College of Science Zhongyuan University of Technology Zhengzhou 450007China

Abstract The effect of before and after removal of crystal water in  starting  material  LuNO33·6H2O  and   AlNO33·9H2O  on synthesis of Lu3Al5O12LuAG nanopowders by solvothermal method was investigated. As a comparison the obtained powders were subsequently heated at 1 000 for 2 h. The phase composition morphology and dispersion of the powders were analyzed by X-ray diffraction XRD), fourier transform infrared spectroscopy FTIR and transmission electron microscopy TEM. The results show that pure phase LuAG nanopowders can be synthesized by solvothermal method using the starting materials with crystal water. The particle size is about 100 nm and has good dispersion. After heat treatment at high temperature the structure of nanopowders tends to be complete but has the slight agglomeration. Therefore the removal of crystalline water in the raw materials is not conducive to the synthesis of LuAG nanopowders by solvothermal method and the LuAG nanopowders obtained by heat treatment are well crystallized.

Keywords Lu3Al5O12 nanopowders crystal water solvothermal method heat treatment

 
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