Z.M.Xu1)
,
J.S.Zhen1)
,
H.F.Liu1) and L.M.Zhang2) 1)Departent of Chemistry
,
Huazhong University of Science and Technology
,
Wuhan 430074
,
China 2)Institute of Materials Science and Engineering
,
Wuhan University of Technology
,
Wuhan 430070
,
China
金属学报(英文版)
Thispaper proposed a new methodof producing Ceramic/ Metalfunctionally gradient mate rialby electroless platingtechnique. The experimentof producing SiC/ Ni PFGM wascar ried out with self made electroless plating facilities. The results show that the thickness of FGMcoating andthegradientdistribution ofcompositioncanbecontrolled byoptimizingelec trolessplating technology and changing the parameters such as plating time, the additionspeed and concentration of SiCparticles. Analysisdemonstratesthatthereisastrongrelation ship amongthe SiCcontent,the microstructureandthe mechanicalproperty ofthe FGM.
关键词:
electrolessplating
,
null
,
null
材料科学技术（英文）
The cyclic plastic straining electrode technique has been used to investigate the transient electrochemical behaviour of Fe-26Cr-1Mo stainless steel in 1M H2SO4 solution at a passive potential. The influence of plastic strain amplitude and plastic strain rate on the dissolution current response was analysed. The experimental results showed that the transient current was dependent on the competitive process of the surface film rupture and repassivation of the new surface. The high plastic strain amplitude and the high plastic strain rate caused a change of electrochemical activity of specimen surface. In the condition of low strain amplitude and strain rate:, the characteristics of current response was mainly relative to the process of new surface repassivation. The competition kinetics has been analysed through the comparison of plastic strain rate and repassivating rate.
关键词:
Nabil S. Youssef
,
K.H.Hegab
材料科学技术（英文）
Some transition metal chelates of two ligands L1 and L2 were prepared and characterized by elemental analysis. The IR and 1H NMR spectra of several chelates of two ligands L1 and L2 showed the involvement of the azo group in chelation with the transition metal ions, in most of the studied chelates, and that the two ligands L1 and L2 showed the involvement of the azo group in chelation with the transition metal ions, in most of the studied chelates, and that the two ligands L1 and L2 were coordinated either in the enol or the keto form. IR spetra also showed that Fe(III)-, Ni(II)-, Mn(II)-, VO(II)-L1 and Cu(II)-L2 chelates behaved in a bidentate manner, in contrast with the two (1:1) M:L cobalt chelates with the two ligands are tridentate. TG analysis indicated the presence of three to twelve water molecules of hydration eliminated on heating up to 150°C and one or two coordinated water molecules removed at 150-180°C. The octahedral structure is proposed for all the chelates, except Cu(II)-L2 and Ni(II)-L1 chelates which have square planar geometry, based on their electronic spectra.
关键词:
陆景彬
,
刘运祚
,
孙亮
,
杨东
,
梁国栋
,
王守宇
,
马英君
,
赵广义
,
李险峰
,
崔兴柱
,
李明非
,
霍俊德
,
曾国模
,
竺礼华
,
吴晓光
原子核物理评论
doi:10.3969/j.issn.1007-4627.2005.02.003
在稀土区奇奇核πh11/2(×)νi13/2转动带中, 系统地观测到随转动频率或角动量增加, B(M1)/B(E2)曲线表现出所谓parabola-like形状, 即在增加到某一转动频率或自旋后, B(M1)/B(E2)比值快速增强. 基于推转模型和粒子转子模型关于奇奇核二准粒子转动带磁偶极约化跃迁几率的描述, 对稀土区双奇核的这一行为进行了讨论. 指出该现象的发生与νi13/2准中子转动顺排特性密切相关. B(M1)/B(E2)比值在接近第二带交叉(即BC准中子对顺排)的较高频率处的增强效果, 可以理解为主要来源于带交叉引起的波函数中混合四准粒子成分的结果. 通过对B(M1)/B(E2)比值的增强效果发生在较低频率处的分析, 对稀土区奇奇核πh11/2(×)νi13/2带角动量耦合图像有了进一步认识.
关键词:
高自旋态
,
奇奇核
,
电磁跃迁特性
,
顺排
Journal of Magnetism and Magnetic Materials
With the help of ab initio method of the full potential linearized augmented-plan-wave, electronic band structure and its ferromagnetic intermolecular interactions for 2-(5-pyrimidinyl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-3-oxoimidazol-1-oxy l are studied, where the exchange-correlation effects of electrons are accounted for. The total and partial density of states and atomic spin magnetic moments are calculated and discussed. It is found that the unpaired electrons in this compound are localized in a molecular orbital constituted primarily of pi*(NO) orbital, and the main contribution of the spin magnetic moment comes from the NO free radicals. It is also found that there exists ferromagnetic intermolecular interaction in the compound. (C) 2003 Elsevier Science B.V. All rights reserved.
关键词:
ab initio method;the organic magnet;electronic structure;ferromagnetic properties;magnetic-properties;nitronyl nitroxide;radicals;crystal
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
陈俊明
,
吕战鹏
中国腐蚀与防护学报
测定了Fe/H_2SO_4,Fe/H_2SO_4+Na_2SO_4,Fe/H_2SO_4+Fe_2(SO_4)_3和Fe/H_2SO_4+NaCI四种体系在磁场或/和缓蚀剂作用下的极化曲线,指出腐蚀的主要控制是阴极过程,H_2SO_4中加入少量Na_2SO_4不影响其结果,但加入Fe_2(SO_4)_3,NaCI会因Fe~(3+),CI~-的作用而影响结果。分析了磁场,缓蚀剂、CI~-和Fe~(3+)单一和联合对Fe/H_2SO_4阴极和阳极极化行为的影响,提出在磁场和缓蚀剂作用下上述四种体系阴极析氢总电流密度的表达式。
关键词:
磁场
,
Fe/H2SO4 systems
,
Inhibitor
,
Polarization behavior
,
Hydrogen evolution
Gengxiang HU
,
Shipu CHEN
,
Xiaohua WU
,
Yonghua RONG and Xiaofu CHEN(Dept. of Materials Science
,
Shanghai Jiao Tong University
,
Shanghai
,
200030
,
China)
材料科学技术（英文）
The deformation behaviour and the nature of dislocations of the Al3Ti-base L12 alloya modified with Fe and Mn etc, were investigated. The results show that the deformation and fracture character istics are closely related to the alloy compositions. The effect of hot-working process on the room tem perature ductility is remarkable, not only resulting in an appreciable improvement of compressive properties but also showing a 0.28% plastic strain in tensile test. The SISF dissociation of a < 110>dislocations on {111} planes was found at room temperature. The determined dissociation scheme is consistent with the mechanical behaviour of these alloys in the lower temperature region.
关键词:
