材料期刊网

Influence of Boron Content in Iron Oxide on Performance of Mn-Zn Ferrites

YU Cheng-feng , LI Yu-guang

钢铁研究学报(英文版)

The ferrites of PC30 (Mn-Zn ferrites) were prepared by using a dry processing route. The effect of Mn-Zn ferrites doped with H3BO3 has been investigated on the basis of microstructure analysis. The results on the samples doped with H3BO3 which is less than 50ppm show that the doping does not have significant effect on Pc, μi, microstructure and density of Mn-Zn ferrites. With further increases in H3BO3 doping(>100ppm), the microstructure of Mn-Zn ferrites is at the critical state between fine grain and ”sandwich”,, the μi and density of Mn-Zn ferrites begin falling quickly, and the increased H3BO3 doping also results in deteriorated Pc properties. Thus controlling the B content in iron oxide is of utmost importance for the quality of Mn-Zn ferrites in producing process.

关键词: iron oxide;Mn-Zn ferrites;Boron content;initial permeability

Professor XU Zhong-yu and his research activities

新型炭材料

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Preface to Special Issue on Photocatalysis for celebrating the 20th anniversary of Professor Jimmy C. Yu’s return to Hong Kong and leading photocatalytic research there

催化学报 doi:10.1016/S1872-2067(15)61006-3

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纳米复合薄膜特异电容机制探讨

程开甲 , 程漱玉 , 林东升 , 肖刚

稀有金属材料与工程

TFDC(Thomas-Fermi-Dirac-Cheng)electron theory用于分析讨论了纳米复合薄膜二极层中电子的特性.根据TFDC电子理论研究和实验测试提出了纳米复合薄膜二极层特异电容产生的机制.

关键词: TFDC电子理论 , 二极层 , 大电容 , 薄膜

论位错的稳定存在

程开甲 , 程漱玉

稀有金属材料与工程

阐述了Thomas-Fermi-Dirac-Cheng电子理论的位错形成机制. 通过对系统总能量的分析提出了位错能够存在的判据, 计算给出多种单质材料位错存在的极限尺寸值.

关键词: 位错 , Thomas-Fermi-Dirac-Cheng , 极限尺寸

论薄膜的超导电性

程开甲 , 程漱玉

稀有金属材料与工程

应用Cheng-Born能带对称破缺理论和TFDC(Thomas-Fermi-Dirac-Cheng)电子理论研究了薄膜层内电子的特性.对金属铂上的TiO2膜层来说,TFDC理论指出电子(或空穴)将由金属与膜的间界面一侧迁移到另一侧.根据Cheng-Born对称破缺理论,当能带中只有很少的电子时,则只有极少的角区中存在电子,动量空间即产生对称破缺,从而导致超导电性,并由热力学估算出薄膜超导体的转变温度.结果显示薄膜超导体的转变温度至少比块材超导体的转变温度高一个量级.作者还设计了一个研究薄膜超导电性的实验.

关键词: 超导电性 , 薄膜 , 对称破缺 , TFDC

论共晶结构的机理

程开甲 , 程漱玉

稀有金属材料与工程

本文是Thomas-Fermi-Dirac-Cheng电子理论对共晶机理的阐述.提出了薄膜两组元之间的化学势差和电子密度差导致系统总能量改变的新思想,给出了研究稳定共晶态的最佳尺寸和能量的方法.

关键词: Thomas-Fermi-Dirac , 共晶 , 内应力 , 化学势 , 电子密度

泡沫混凝土导热系数模型及参数修正

李翔宇 , 赵霄龙 , 郭向勇 , 曹力强

材料导报

在Cheng-Vachon模型的基础上提出了一种针对由连续相和分散相组成的两相复合材料的新导热系数模型.通过引入一个新的参数,即分散相的修正体积含量来改进Cheng-Vachon模型不适用于分散相体积含量较大的缺点.使用新的导热系数模型预测泡沫混凝土的导热系数,与实验结果的对比表明,新的模型可以准确预测泡沫混凝土的导热系数.

关键词: 泡沫混凝土 , 复合材料 , 导热系数 , 无机材料

Improved Nonlinear Equation Method for Numerical Prediction of Jominy EndQuench Curves

SONG Yuepeng , LIU Guoquan , LIU Shengxin , LIU Jiantao , FENG Chengming

钢铁研究学报(英文版)

Without considering the effects of alloying interaction on the Jominy endquench curves, the prediction results obtained by YU Baihai′s nonlinear equation method for multialloying steels were different from those experimental ones reported in literature. Some alloying elements have marked influence on Jominy endquench curves of steels. An improved mathematical model for simulating the Jominy endquench curves is proposed by introducing a parameter named alloying interactions equivalent (Le). With the improved model, the Jominy endquench curves of steels so obtained agree very well with the experimental ones.

关键词: Jominy endquench curve;nonlinear equation method;alloying interaction parameter;computer simulation

1998 COMPREHENSIVE TABLE OF CONTENTS

中国腐蚀与防护学报

N。1Atmospheric Corrosivlty for Steels………………………………………………… .LIANG Caideng HO[I i。-tat（6）Caustic Stress Corrosion Cr。king of Alloy 800 Part 2.The Effect of Thiosul执e……………………………………… KONG De-sheng YANG Wu ZHAO Guo-zheng HUANG De.ltL。ZHANG Yu。。he CHEN She。g-bac（13）SERS slid E16CttOCh6iniC81 Stlldy Of Illhibit1Oli M6ch＆tllsth Of ThlollY68 Oil ITOll ID H....

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