材料期刊网

Corrosion Behaviour of Nickel in Chloroacetic Acids and its Inhibition

S.M.Rashwan , A.Emam , S.M.Abd El-Wahab , M.M.Mohamed

材料科学技术（英文）

Anodic dissolution behaviour of Ni in mono-, di- and trichloroacetic acids has been investigated by measuring current densities of Ni electrode (versus SCE) at different potentials. Effects of acid concentration, pH, scan rate and additive inhibitor on the potential were studied and they revealed that there is a considerable shift of potential. Potentiodynamic polarization measurements show that the corrosion rate of Ni in chloroacetic acid solutions increases by increasing the previous factors. However, by adding inhibitor, it decreases.

关键词: Corrosion , null , null , null

基于DSP和S1D13305的EL屏显示控制系统设计

王兆伟 , 李士钊

液晶与显示 doi:10.3788/YJYXS20142903.0389

针对野外恶劣使用环境,设计了一种环境适应性强的显示控制系统.该系统采用基于DSP和S1D13305控制EL显示屏的设计方案,从软硬件两方面阐述了DSP和显示控制芯片之间的接口电路和设计方法,解决了显示控制芯片内部字库内容单一的问题,并给出了系统设置和显示控制芯片初始化程序,开发了显示驱动模块.经过实战考核和应用,该显示系统在野外恶劣环境中工作稳定,显示效果良好.该显示系统达到了预期效果.

关键词: 控制 , DSP , S1D13305 , EL显示屏

Secondary M6C precipitation in K40S cobalt-base alloy

Materials Letters

Secondary M,C precipitation was investigated in K40S cobalt-base alloy after 100 h aging at 950 degreesC. The results showed that it was closely related to the tungsten-rich zones inherited from the as-cast condition and the degeneration of the primary M7C3 carbide. A direct element reaction, 6M + C --> M6C, in which C comes from the decomposition of the M7C3 carbides, is suggested as the mechanism of secondary M6C precipitation in K40S alloy. (C) 2001 Elsevier Science B.V. All rights reserved.

关键词: M6C precipitation;aging;M7C3 carbide;superalloy

有机EL和LED与无机EL和LED发光机制的异同

李文连

液晶与显示 doi:10.3969/j.issn.1007-2780.2001.01.007

比较了有机EL和LED与无机EL和LED的主要差异。有机EL属于电注入发光，无机EL属于高场激发下的碰撞离化机制，而且有机LED和无机LED的激发和发光机制也不同。无机半导体中往往存在着局域载流子，而有机LED必须从电极注入，在未注入载流子之前，它们是绝缘体。不能简单地用无机LED中的p-n结理论来解释有机LED的发光现象。

关键词: 有机电致发光 , 半导体 , 发光

INFLUENCE OF GRAIN SIZE AND ORDERING OF PARENT PHASE ON M_s IN A CuZnAl ALLOY CONTAINING BORON

WU Jianxin JIANG Bohong XU Zuyao (T.Y.Hsu) Shanghai Jiaotong University , Shanghai , China Associate Professor , Dept.of Materials Science and Engineering , Shanghai Jiaotong University , Shanghai , China

金属学报(英文版)

The effect of grain size and ordering of the parent phase on the critical points of thermoelastic martensitic transformation in Cu-25.62 Zn-3.97 Al-0.0018 B(wt-%)shape memory alloy has been investigated.Based on the thermodynamics of phase transformation,a linear rela- tionship between the starting temperature of martensitic transformation and the reciprocal of the square root of grain size is obtained,i.e.M_s temperature rises with increasing grain size. It shows a good agreement with the results of electric resistance measurement.Applying the Landau's theory,a quantitative relationship between M_s and the ordering parameter of the parent phase is set up,which is well confirmed by the results of X-ray diffraction and electric resistance measurement.The activation energy of the ordering process in the parent phase of the alloy is calculated to be 46 kJ/mol.

关键词: Cu-Zu-Al , null , null , null , null

有机EL与无机EL和LCD的比较及其未来前景

李文连

液晶与显示 doi:10.3969/j.issn.1007-2780.2002.01.005

通过比较有机EL与无机EL、LCD在平板显示应用方面的差异,展示了OELD的美好应用前景.由于无机薄膜EL缺乏高亮度蓝基色成分以及驱动电压是100V左右的交流,难于制成低压彩色超薄显示器;无机分散型EL屏采用的是十几微米厚的粉末材料,也难于制成高分辨率超薄显示器,因此它们都无法与OELD相比.OELD显示器体积可以是LCD的1/2,功耗也大大低于LCD,所以OELD将有望取代LCD.评述了当前OELD的最新发展趋势:采用荧光染料掺杂式的模糊界面结构的电致荧光器件和采用荧光染料掺杂式的电致磷光器件是当前OELD发展的主要潮流.文中还评述了采用低折射率材料提高外量子效率的情况.

关键词: 电致发光 , 磷光 , 发光平板显示

Prediction of Solid-Liquid Interface Stability by Coupling M-S Model with CALPHAD Method

Ruijie ZHANG , Zhi HE , Zhongwei CHEN , Wanqi JIE

材料科学技术（英文）

A method to predict the solid-liquid interface stability during unidirectional solidification is developed by coupling M-S model with CALPHAD method. The method was applied to Al-0.38 Zn and Al-0.34 Si-0.14 Mg (wt pct) alloys, and the predicted results were compared with some former experimental data of the two alloys. The good agreement between the calculation results and the experimental data demonstrates the superiority of the present method to the classical one based on constant parameter assumptions.

关键词: Interface stability , null , null

反渗透系统的2m/s流速管道与径流方向模拟分析

汪艳宁 , 张智超 , 苑宏英 , 靖大为

膜科学与技术 doi:10.16159/j.cnki.issn1007-8924.2016.06.003

以反映管道压降的系统模拟软件为工具,以特定基准系统参数及2 m/s管道流速为基础,分析了各种径流方向组合的反渗透系统运行工况,提出了全壳产水量与全壳错流比两个分别表征各壳元件污染速度与清污力度的运行指标,证明了各壳元件产水量失衡是其污染失衡的主要原因,明确了目前工程中常用的2 m/s流速管道系统中底层膜壳污染最重.

关键词: 反渗透系统 , 管道压降 , 径流方向 , 污染分布

D2、M2、S5模具扁钢脱碳特性实验研究

赵德文 , 郭长武 , 刘相华 , 王国栋 , 徐辉 , 戴建明

钢铁

开展了在空气和氮气两种气氛下，采用Gleeble-1500热模拟机与普通电炉两种加热方式、不同加热温度、加热时间对D2、M2、S5钢脱碳层深度影响的试验研究。依据试验结果，结合现场实际制定了较为合理的生产工艺并在现场成功应用，使上述模具扁钢脱碳层指标达到了美国ASTM-A681技术标准。

关键词: 脱碳层深度 , 模具扁钢 , ASTM-A681

Chemical bonding and mechanical properties of M(2)AC (M = Ti, V, Cr, A = Al, Si, P, S) ceramics from first-principles investigations

Journal of Materials Research

MAX-phase carbides (M is an early transition metal, A is an A-group element) exhibit an interesting bonding characteristic of alternative stacking of strong M-C bonds and relatively weak M-A bonds in one direction. In the present first-principles total energy calculations, we establish the relationship between mechanical properties and electronic structure for ternary M(2)AC (M = Ti, V, Cr. A = Al, Si, P, S) carbides. By systematically tuning elements on the M and A sites, pronounced enhancements of bulk modulus, elastic stiffness, and ideal shear strength are achieved in V-containing V(2)AC (A = Al, Si, P, and S) carbides. It is suggested that tailoring on the A site is more efficient than on the M site in strengthening the mechanical properties of studied serial carbides. The results highlight a general trend for tailor-made mechanical properties of ternary M(2)AC carbides by control of chemical bonding.

关键词: strength;solids;shear;dislocations;ti3sic2