检索结果-南通市图书馆

Comparison between the Requirements of Flowability and Moldability and the Shape Retention of PIM Compacts during Debinding Process

在线全文

学校读者我要写书评

暂无评论

Journal of materials science & Technology 2001年第5期17卷 490-494页

作者： K.A.KhaliI, Baiyun HUANG and Yimin LI state Key laboratory for Powder Metallurgy, Central South university, Changsha 410083, china M.M.El-Sayed Seleman department of materials science and engineering, Northeastern university, Shenyang 110006, china state Key Lab. for Powder Metall. Central South Univ. Changsha 410083 China

To successfully employ powder injection molding (PIM) as a manufacturing technique, the function of the component, design of the part, material and process should be optimized for overall processing ability of the PIM process. A comparison between the requirements of flowability and moldability and the compacts shape retention has been made in this work. There is often a contradiction between the requirements of flowability and the compacts shape retention. Many works have been done to attain good molding conditions. However, they fail to take into account the effect of some factors that satisfies good molding conditions on the compacts shape retention during debinding. This paper studies the effect of the powder-binder mixture characteristics and the molding conditions on the flowability and moldability and the shape retention of PIM compacts during debinding process so as to attain the benefits of each.

关键词： PIM Comparison between the Requirements of Flowability and Moldability and the Shape Retention of PIM Compacts during Debinding Process

稀土Gd_5Ge_2(Si_(2-x)Al_x)合金系的晶体结构和磁卡效应研究

在线全文

学校读者我要写书评

暂无评论

中国稀土学报 2003年第Z1期21卷 114-116页

作者：黄军平罗广圣唐少龙吴小山南昌大学材料科学与工程学院江西南昌330047 南京大学国家固体微结构实验室江苏南京210093

用磁控电弧炉在氩气气氛下熔炼了Gd5Ge2(Si2-xAlx)(x=0,0.1,0.2,0.5,1.0)系样品。X射线粉末衍射分析表明,样品基本为单相结构,其晶体对称性不会随Al含量的增加而改变。用振动样品磁强计测量了样品的M T曲线和不同温度下的M H曲线。居里... 详细信息

用磁控电弧炉在氩气气氛下熔炼了Gd5Ge2(Si2-xAlx)(x=0,0.1,0.2,0.5,1.0)系样品。X射线粉末衍射分析表明,样品基本为单相结构,其晶体对称性不会随Al含量的增加而改变。用振动样品磁强计测量了样品的M T曲线和不同温度下的M H曲线。居里温度随Al含量x的增加略有减小,当x=0.2时Gd5Ge2(Si2-xAlx)有最大-ΔSM值。退火对样品的居里温度和磁卡效应影响不大,退火前后的居里温度和磁卡效应基本保持一致。

关键词：磁热效应磁熵变晶体结构居里温度稀土

A Study on the Wear Resistance of Nano-material/E51

在线全文

学校读者我要写书评

暂无评论

Journal of materials science & Technology 2004年第3期20卷 340-343页

作者： Yan GAO Zhenjia WANG Quanyu MA Ge TANG Ji LIANG state Key laboratory of Tribology, department of Mechanical engineering, Tsinghua university, Beijing 100084, china Lab. of Tribology Dept. of Mech. Eng. Tsinghua Univ. Beijing 100084 China

Epoxy resin modified by nanometric γ-alumina or multi-walled carbon nanotubes (MCNTs) was prepared with solution mixingmethod, and the wear resistance of the composite was studied. The results show that when an optimum amount of nanometricalumina or MCNTs is filled in epikote51 (E51), the wear resistance of the composite will increase. When 8 wt pct nanometricγ-alumina is filled in E51, the wear resistance of the composite increases to 230%. When 10% MCNTs is filled in E51, thewear resistance of the composite increases to 226%. When nanometric alumina is filled in, the wear resistance of modifiedepikote51 will increase as the cure temperature is heightened.

关键词： Epoxy resin Nanometric γ-alumina Multi-walled carbon nanotubes (MCNTs) Wear resistance

HCWCI/Carbon Steel Bimetal Liner by Liquid-Liquid Compound Lost Foam Casting

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2012年第10期19卷 13-19页

作者： XIAO Xiao-feng1,2, YE Sheng-ping2, YIN Wei-xin3, XUE Qiong4 (1. School of Mechanical engineering and Automation, Wuhan Textile university, Wuhan 430073, Hubei, china 2. state Key laboratory of material Processing and Die and Mould Technology, Huazhong university of science and Technology, Wuhan 430074, Hubei, china 3. Wuhan Zhike Abrasive-Resistant material science and Technology Development Co Ltd, Wuhan 430073, Hubei, china 4. College of science, Wuhan university of Technology, Wuhan 430079, Hubei, china) School of Mechanical engineering and Automation Wuhan Textile University Wuhan Hubei China state Key laboratory of material Processing and Die and Mould Technology Huazhong University of Science and Technology Wuhan Hubei China Wuhan Zhike Abrasive-Resistant material science and Technology Development Co Ltd Wuhan Hubei China College of science Wuhan University of Technology Wuhan Hubei China

Impact, friction and corrosion from the grinding balls and the grinding medium during the mineral processing result in liner breakage. Liner, made from Hadfield steel or alloyed steel, could not have served in wet grinding environment for more than ten months. Composite liner, made from HCWCI (high Cr white cast iron) and carbon steel, has been developed successfully with liquid-liquid composing process based on LFC (lost foam casting). The microstructure of composite was analyzed with optical microscope, SEM (scanning electron microscope)/EDX energy-dispersive X-ray and XRD (X-ray diffraction). According to micrograph, the combination region of two metals was staggered like dogtooth, no mixtures occurred between two liquid metals, and its interface presented excellent metallurgical bonding state. The results of mechanical property test show that, the hardness of HRC, the fracture toughness, and the bending strength are more than 61, 16.5 J/cm2 and 1 600 MPa, respectively. Comparison between liners made from bimetal composite and alloyed steel has also been investigated in industrial hematite ball mill. The results of eight months test in wet grinding environment prove that the service life of bimetal composite liner is three times as long as that of one made from alloyed steel.

关键词： composite liner bimetal liquid-liquid compound composite interface lost foam casting high Cr white cast iron

Fabrication and magnetocrystalline anisotropy of NiCo(002) films

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2015年第3期24卷 362-365页

作者：樊维佳马丽时钟周仕明 Shanghai Key laboratory of Special Artificial microstructure and Pohl Institute of solid state Physics and School of Physics science and engineering Tongji University

A series of 30-nm-thick epitaxial NixCo1-x （002） alloy films are fabricated by DC magnetron sputtering. MgO （002） and SrTiO3 （002） single substrates are used for x 〉 0.5 and x 〈 0.5, respectively. The magnetocrystalline anisotropy of NixCO1-x （002） alloy films is studied in the entire composition region for 0 ≤ x ≤ 1.0. When x decreases, the cubic magnetic anisotropy constant K1 changes sign from negative to positive atx = 0.96 and becomes negative again atx = 0.79. It becomes more negative as x decreases from 0.79 to 0. The uniaxial anisotropy Ku is smaller than the K1 by a factor of two orders.

关键词： face centered cubic CoNi alloy magnetocrystalline anisotropy

Effect of Ultrafine Grinding on Dissolving-out Quantity of Tanshinone IIA from Radix Salvia Miltiorrhiza

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan university of Technology(materials science) 2009年第6期24卷 973-976页

作者：苏艳丽傅正 College of Chemistry Chemical Engineering and Material ScienceSoochow UniversitySuzhou China state Key laboratory of Advanced Technology for material Synthesis and Processing Wuhan University of Technology

In order to improve the bioavailability, Radix salvia miltiorrhiza raw powder mixed with distilled water （5.5wt%） was ultrafinely ground to nanosize particles using HSCS pulverizer, and the dissolving-out quantity of tanshinone IIA in the filtrate that obtained from nanoparticles suspension and raw powder marinated in water for different time was determined by HPLC. The experimental results show that raw powder can be ultrafinely ground to 133.5 nm at 1500 r/min for 50 min and the molecular structure of active ingredients doesnot change, and the dissolving-out quantity of tanshinone IIA obtained from the filtrate is increased greatly from 12.77 μg/g to 54.55 μg/g.

关键词： Radix salvia miltiorrhiza tanshinoe IIA HPLC dissolving-out quantity

Sediment transport capacity of hyperconcentrated flow

在线全文

学校读者我要写书评

暂无评论

science china(Physics,Mechanics & Astronomy) 2008年第8期51卷 961-975页

作者： SHU AnPing1,2 & FEI XiangJun2 1 School of Environment & Key laboratory of Water and Sediment sciences,Ministry of Education,Beijing Normal university,Beijing 100875,china 2 state Key laboratory of Hydroscience and engineering,Tsinghua university,Beijing 100084,china School of Environment & Key laboratory of Water and Sediment sciences Ministry of Education Beijing Normal University Beijing China state Key laboratory of Hydroscience and engineering Tsinghua University Beijing China

As one of the most important components of river mechanics,sediment transport capacity of sediment-laden flows has attracted much attention from many researchers working on river mechanics and hydraulic engineering. Based on the time-averaged equation for a turbulent energy equilibrium in solid and liquid two-phase flow,an expression for the efficiency coefficient of suspended load movement was derived for the two-dimensional,steady,uniform,fully-developed turbulent flow. A new structural expression of sediment transport capacity was achieved. Using 115 runs of flume experimental data,which were obtained through two kinds of sediment transport experiments in the state of equilibrium,in combination with the basic rheological and sediment transporting characteristics of hyperconcentrated flow,the main parameters in the structural expression of sediment transport capacity were calibrated,and a new formula of sediment transport capacity for hyperconcentrated flow was developed. A large amount of field data from the Yellow River,Wuding River,and Yangtze River,etc. were adopted to verify the new formula and good agreement was obtained. These results above contribute to an improved theoretical system of river mechanics and a reliable tool for management of rivers carrying high concentration of sediments.

关键词： hyperconcentrated flow turbulent energy equilibrium efficiency coefficient sediment transport capacity

microstructure and Strength of Laser Welds of Sub-micron Particulate-reinforced Aluminum Matrix Composite Al_2O_(3p)/6061Al

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2001年第3期20卷 178-182页

作者： Liming Liu, Jitai Niu 1) department of materials engineering, Dalian university of Technology. Dalian 116024, china 2) national Key laboratory of Advanced Welding Production Technology, Harbin Institute of Technology,Harbin 150001, china 大连理工大学辽宁大连 116024 哈尔滨工业大学现代焊接生产技术国家重点实验室黑龙江哈尔滨 150001

The microstructure of laser welds of sub-micron particulate-reinforced aluminum matrix composite Al_2O_(3p)/6061Al and the weldability of the material were studied. Experimental results indicated that because of the huge specific surface area of the reinforcement, the interfacial reaction between the matrix and the reinforcement was re- strained intenslvely at elevated temperature and pulsed laser beam. The main factor affecting the weldability of the com- posite was the reinforcement segregation in the weld resulting from the push of the liquid/solid interface during the soli- dification of the molten pool. The laser pulse frequency directly affected the reinforcement segregation and the reinfor- cement distribution in the weld, so that the weldability of the composite could be improved by increasing the laser pulse frequency. On the basis of this, a satisfactory welded joint of sub-micron paniculate-reinforced aluminum matrix com- posite Al_2O_(3p)/6061Al was obtained by using appopriate welding parameters.

关键词： sub-micron particulate-reinforced aluminum matrix composite laser welding welded joint reinforced matrix

Multiparty quantum secret sharing of classical and quantum messages

在线全文

学校读者我要写书评

暂无评论

Progress in Natural science:materials International 2007年第1期17卷 26-31页

作者： CHEN Pan, DENG Fuguo and LONG Guilu ( Key laboratory for Quantum Information and Measurements, and department of Physics, Tsinghua university, Beijing 100084, china Key laboratory of Beam Technology and material Modification, MOE, Institute of Low Energy Nuclear Physics, and department of material science and engineering, Beijing Normal university, Beijing 100875, china Beijing Radiation Center, Beijing 100875, china Key laboratory for Atomic and Molecular Nano-sciences, Tsinghua university, Beijing 100084, china) Key laboratory for Quantum Information and Measurements and Department of Physics Tsinghua University Beijing 100084 China Key laboratory of Beam Technology and material Modification MOE Institute of Low Energy Nuclear Physics and Department of Material Science and Engineering Beijing Normal University Beijing 100875 China Beijing Radiation Center Beijing 100875 China Key laboratory for Atomic and Molecular Nano-sciences Tsinghua University Beijing 100084 China

A scheme for multiparty quantum secret sharing of classical and quantum messages is proposed by using entanglement swapping. This scheme can distribute not only the classical information but also the quantum informati... 详细信息

关键词： quantum secret sharing classical message quantum message EPR pair.