材料期刊网

Aging Precipitates and Strengthening Mechanism of T122 Boiler Steel

Han-Sheng BAO Shi-chang CHENG Zheng-dong LIU Shu-ping TAN

钢铁研究学报(英文版)

T122 steel has been used to produce superheater or reheater of ultra supercritical boilers. With the help of chemical phase extraction and microstructure characterization, the authors of the paper investigated the performance of aging precipitates of T122 steel, such as M23C6 carbide, Laves phase, MX phase and cu-rich phase, discussed the strengthening mechanism of the steel, and calculated athermal yield stress of lath substructure, dislocations and precipitates of the steel. It was found that lath substructure and dislocations dominate the strengthening attribution and precipitation hardening goes second to the strengthening attribution.

关键词: T122 heat resistant steel;strengthening;precipitate;substructure;dislocation

HAN液晶盒中开关时间对形变场弛豫过程的影响

李晓吉 , 郑桂丽 , 张志东

液晶与显示 doi:10.3788/YJYXS20132801.0025

在HAN液晶盒撤掉外加电压的过程(即弛豫过程)中,假定电压的开关时间为有限的,把电压处理为时间的指数衰减函数.在这一假定下,对撤掉外加电压后HAN液晶盒中指向矢的分布情况进行研究,得到了对HAN液晶盒的弛豫过程有影响的电压开关时间的范围.

关键词: HAN液晶盒 , 有限开关时间 , 驰豫过程 , 动力学理论

立方 TaN纳米粉的制备

类伟巍 , 沈龙海 , 刘丹 , 李雪飞 , 彭刚 , 崔启良 , 邹广田

无机材料学报 doi:10.3724/SP.J.1077.2007.00400

采用直流电弧法使金属钽和氮气直接反应制备出了TaN纳米粉．利用XRD、XPS、TEM等测试方法对所制备的TaN纳米粉进行了表征．结果表明: 所制备的纳米粉为单一的立方相TaN, 纳米颗粒的平均粒度为5~10nm．实验中还发现氮气的气压对制备纯立方相TaN具有关键性作用, 并讨论了立方相TaN的形成机理．

关键词: 立方相TaN , nanocrystallites , dc arc discharge method

立方TaN纳米粉的制备

类伟巍 , 沈龙海 , 刘丹 , 李雪飞 , 彭刚 , 崔启良 , 邹广田

无机材料学报 doi:10.3321/j.issn:1000-324X.2007.03.004

采用直流电弧法使金属钽和氮气直接反应制备出了TaN纳米粉.利用XRD、XPS、TEM等测试方法对所制备的TaN纳米粉进行了表征.结果表明:所制备的纳米粉为单一的立方相TaN,纳米颗粒的平均粒度为5～10nm.实验中还发现氮气的气压对制备纯立方相TaN具有关键性作用,并讨论了立方相TaN的形成机理.

关键词: 立方相TaN , 纳米粉 , 直流电弧法

Microstructural study on multilayer FeTaN/TaN (5) films

Materials Letters

The microstructure of [FeTaN/TaN](5) multilayer films has been investigated by transmission electron microscopy (TEM) and high-resolution electron microscopy (HREM) in cross section and plan view. Each layer shows a small surface roughening less than 1 nm. The FeTaN layers are composed of b.c.c. Fe with Ta incorporated substitutionally and N interstitially, denoted as Fe(Ta,N); while the TaN layers mainly consist of f.c.c. TaN phase. A [110] texture of Fe(Ta,N) has been formed in the FeTaN layers. The columnar grain structure is a typical feature in FeTaN layers. (C) 2003 Elsevier Science B.V. All rights reserved.

关键词: microstructure;thin films;magnetic materials;transmission electron;microscopy (TEM);sputtering;fetan thin-films;magnetic-properties;recording-heads;tantalum;nitride;temperature

电场诱导纳米结构HAN液晶盒中新型有序重构过程的描述

陈思博 , 王永超 , 周璇 , 张志东

液晶与显示 doi:10.3788/YJYXS20163109.0853

基于 Landau-de Gennes 理论，利用松弛迭代的方法，研究了包含－1/2向错线的混合排列(HAN)液晶盒中，平行于向错线的电场所诱导的结构转变。结果表明，盒厚固定时，电场诱导五种结构转变过程；电场固定时，盒厚变化产生三类结构转变方式。力曲线上的极小值确定了液晶系统发生结构转变的临界盒厚。

关键词: 有序重构 , Landau-de Gennes理论 , -1/2 向错 , 力曲线

High temperature naphthenic acid corrosion of steel in high TAN refining media

Anti-Corrosion Methods and Materials

Purpose - This paper aims to study the corrosion behavior of carbon steel and stainless steel in white oil with naphthenic acid under high temperature. Design/methodology/approach - The weight-loss method and surface analysis were used to study the corrosion behavior of steel in white oil with naphthenic acid. Findings - Naphthenic acids corrosion rates were directly related to experimental temperature, immersion time and total acid number (TAN). The activation energy was calculated and the process kinetics could be represented by Arrhenius-type equation. The relationship between the isothermal line in liquid phase and that in vapor phase at different TAN values had a significant distinction with the change of temperature. Originality/value - The findings have important implications for assessing the corrosivity of crude oils with high TAN value from various resources.

关键词: Corrosion;Stainless steel;Oils;Acids;refineries

TaN薄膜局部腐蚀早期过程的ECAFM原位研究

俞春福 , 徐久军 , 黑祖昆

腐蚀与防护 doi:10.3969/j.issn.1005-748X.2004.03.005

电化学原子力显微镜(ECAFM)可以在液体环境下工作,能原位观察电极反应过程中的腐蚀界面形貌.文章介绍利用ECAFM从纳米空间分辨度上原位研究离子束增强沉积TaN膜在0.4mol/L HCl溶液中的局部腐蚀早期过程,结果发现,表面形貌为颗粒状结构的TaN膜在0.4mol/L HCl中进行阳极极化时,颗粒结构的微观顶峰优先溶解,导致颗粒高度降低,边界扩大蔓延,使膜层表面趋于平整化.

关键词: 电化学原子力显微镜 , TaN , 原位 , 腐蚀

BaO-Nd2O3-TiO2系电容器陶瓷介电性能研究

徐小勇 , 施卫国

稀有金属材料与工程

通过正交实验法,选用Bi2O3和Pb3O4为添加剂,采用电子陶瓷的生产工艺,对BaO-Nd2O3-TiO2(简称 BNT)系统进行了改性研究,研究结果表明:BaO:Nd2O3:TiO2的摩尔比为1:1:4,添加物Bi2O3和Pb3O4的加入量与BaO的摩尔比分别为0.17:0.04时的介电常数最高ε=103.11,介质损耗tanδ=4×10-4,同时还讨论了不同成分比,添加剂加入量以及工艺因素对电容器介电性能的影响.

关键词: 电容器 , 介质损耗 , 介电常数 , BaO-d2O3-TiO2系统

THE CALCULATION OF BaO ACTIVITIES IN BaO-BaF_2-Cr_2O_3 SYSTEM FLUXES USING SCHUHMANN METHOD

L.F. Li , Z.P. Chen , M.F. Jiang and W.Z. Wang(Department of Ferrous Metallurgy , School of Materials and Motallurgy , Northeastern University Shenyang 110006 , China)(The Technology Center , Baoshan Iron & Steel Complex , Shanghai 201900 , China)

金属学报(英文版)

The principle and steps for the calculation of component activities in fluxes using Schuhmann method are described. On the foris of Gibbs-Duhem equation and using Cr2O3 activities in BaO-BaF2-Cr2O3 system fiuxes, BaO activities at 1523 and 1673K are calculated, respectivelg,and the isoactivity diagrums of BaO are also obtained. The calculation results indicate that BaO activity increases with increasing its content in fiuxes, and decreaaes with the increase of Cr2O3 content at a given XBaO/XBaF2 ratio.

关键词: Shuhmann method fluxes , null , null