材料期刊网

由有机和无机金属前躯体自蔓延高温合成碳包覆磁纳米粒子

M.Bystrzejewski , M.Szala , W.Kiciński , W.Kaszuwara , M.H.Rummeli , T.Gemming , A.Huczko

新型炭材料 doi:10.1016/S1872-5805(09)60017-2

介绍了一项由自蔓延高温合成(SHS)碳包覆磁纳米粒子的系统研究.采用还原剂NaN3和三种不同氧化剂-聚四氟乙烯、六氯乙烷和六氯苯,实施了SHS制备.研究了金属前躯体(Fe(CO)5或K3)对产物的得率、反应热、形貌、结构和磁性能的影响.结果表明:有机铁前躯体和C2Cl6氧化剂反应体系可获得磁性最佳、...

关键词: 自蔓延高温合成(SHS) , 燃烧合成 , 磁纳米粒子 , 碳纳米结构

洋葱状炭纳米粒子的无催化剂合成

M.Bystrzejewski , M.H.Rummeli , T.Gemming , H.Lange , A.Huczko

新型炭材料 doi:10.1016/S1872-5805(09)60011-1

描述了基于NaN_3-C_6Cl_6混合物热解一步合成洋葱状碳纳米粒子的方法.应用EMS, XRD, Ramans研究了缓冲气体(Ar或空气)对炭产物的得率、形貌和结构的影响.产物包含洋葱炭、非晶碳和NaCl,通过简单的纯化处理即可完全除去副产物.洋葱状炭纳米粒子的形成由热解过程中压力迅速增加产生的...

关键词: 碳纳米洋葱 , 热解 , 气相反应 , XRD , Raman光谱

Oxygen reduction mechanism on copper in a 0.5 M H(2)SO(4)

Electrochimica Acta

The mechanism of the oxygen reduction reaction (ORR) in a naturally aerated stagnant 0.5 M H(2)SO(4) Was studied using electrochemical methods. The cathodic polarization curve showed three different regions; electrochernical impedance spe...

关键词: Oxygen reduction;Hump phenomenon;Chemical redox;Copper;Electrochemical impedance spectroscopy;sulfuric-acid electrolyte;anodic-dissolution;sulfate-solutions;corrosion;behavior;adsorption;chloride;cu(111);alloy;model

Simulations of Coarsening Behavior for M23C6 Carbides in AISI H13 Steel

Xinbin HU , Mei ZHANG , Xiaochun WU , Lin LI

材料科学技术（英文）

Based on the local equilibrium assumption, coarsening behavior of M23C6 carbide at 700℃ in H13 steel was simulated by DICTRA software. The results from the calculations were compared with transmission electron microscopy (TEM) observation...

关键词: DICTRA Simulation , 碳化物粗化 , 界面能 , H13钢

A Novel near Net-Shape Technique for P/M Parts with Large H/D Ratio

Yong LIU , Baiyun HUANG , Kechao ZHOU , Hongwu OUYANG , Yuehui HE

材料科学技术（英文）

In order to overcome the shortcomings of conventional hot pressing, a novel near net-shape technique, called radial hot pressing, for P/M parts with large height-to-diameter (H/D) ratio was introduced. Effects of processing parameters on ...

关键词: Near net-shape technique , null , null

1m3/h RO-EDI高纯水设备的研制

刘红斌 , 龚承元 , 苏建勇 , 朱孟府 , 马军 , 张西正

膜科学与技术 doi:10.3969/j.issn.1007-8924.2002.03.014

介绍了工业规模的EDI膜堆和1 m3/h RO-EDI高纯水设备的研制情况,进行了设备的稳定性试验和EDI产水的水质分析,并与离子交换树脂进行了技术经济性能比较.

关键词: 电去离子 , 反渗透 , 制药用水 , 高纯水

Copper corrosion and anodic electrodissolution mechanisms in naturally aerated stagnant 0.5 M H(2)SO(4)

Corrosion Science

Mechanisms of copper corrosion and electrodissolution in naturally aerated, stagnant 0.5 M H(2)SO(4) were investigated by means of electrochemical techniques, compared with deaerated measurements. The role of dissolved oxygen was suggeste...

关键词: Copper;Electrochemical impedance spectroscopy (EIS);Corrosion;Electrodissolution;Chemical redox;acidic sulfate-solutions;sulfuric-acid;electrochemical reduction;impedance spectroscopy;oxygen reduction;disk-electrode;reaction;model;dissolution;behavior;iron

磁制冷材料在不同温度下的M-H曲线测量方法及设备的研究

刘金荣 , 黄焦宏 , 金培育 , 李满才 , 成永顺 , 徐来自 , 邱巨峰 , 杨保荣 , 杨文志 , 王贵 , 王正德 , 张泽玉

稀土 doi:10.3969/j.issn.1004-0277.2001.06.011

为了选择合适的磁制冷材料,得到材料的磁热效应,即ΔS-T曲线,必须测出材料在不同温度下的M-H曲线.我们采用脉冲磁场的方式提供测试所需的高磁场,自行研制了符合测试精度要求的M-H

关键词: 磁热效应 , 脉冲磁场 , 磁熵变 , M-H曲线

M2和H13钢离子渗氮-电弧镀TiAlCrN膜复合技术

陈灵 , 曾德长 , 邱万奇 , 董小虹 , 黎炳雄 , 黄拿灿

材料热处理学报

对M2和H13钢进行离子渗氮-多弧离子镀TiAlCrN膜复合表面改性,并采用电子探针、X射线衍射、扫描电镜、纳米压痕和微米划痕仪等手段分析了薄膜的成分、组织结构与力学性能.结果...

关键词: 离子镀 , 渗氮 , TiAlCrN涂层 , 微观结构 , 硬度

EPR investigation of local structure for Mn(H(2)O)(6) (2+) cluster in M(H(2)O)(6) XCl(6): Mn(2+) (M = Zn, Mg, Cd, Ca; X = Pt, Sn) systems at different temperatures

Chemical Physics Letters

A theoretical method for studying the inter-relation between the local structure and EPR spectra is established by diagonalizing the complete energy matrices. For [M(H(2)O)(6)]XCl(6): Mn(2+) (M = Zn, Mg, Cd,...

关键词: electron-paramagnetic-resonance;single-crystals;spectra;field;ions;spectroscopy;copper(ii);complexes;behavior;mn(ii)