材料期刊网

High-Temperature Oxidation Resistance of Austenitic Stainless Steel Crl8Nil 1Cu3Al3MnNb

钢铁研究学报(英文版)

关键词: 奥氏体不锈钢 , 高温抗氧化 , 氧化动力学曲线 , 扫描电子显微镜 , 铬氧化物 , 抛物线规律 , X射线衍射 , 氧化膜

Thermomechanical Analysis of （Cu0.5Tl0.5）-1223 Substituted by Pr and La

材料科学技术（英文）

关键词: 热机械分析 , 扫描电子显微镜 , 线性热膨胀系数 , 超导转变温度 , 温度范围 , 数据计算 , X射线衍射 , 1223相

Ni-B和Ni-Ce-B超细非晶态合金的退火晶化及其催化性能

王晓光 , 张新夷 , 李忠瑞 , 钟文杰 , 贺博 , 韦世强

催化学报

采用XAFS,XRD和DTA方法研究了Ni-B和Ni-Ce-B超细非晶态合金在退火过程中的结构变化及其结构与催化性能的关系. 活性结果表明,在退火温度为623 K时,Ni-B和Ni-Ce-B样品的苯加氢催化反应转化率最高,分别为63%和81%, 0.3% Ce的掺入提高了Ni-Ce-B的催化活性. DTA结果表明,Ni-B超细非晶态合金在598和653 K有两个晶化峰,而Ni-Ce-B样品有5 48,603,696和801 K四个晶化峰. XAFS和XRD结果进一步说明,在573 K退火时,Ni-B样品晶化生成晶态Ni3B和纳米晶Ni,此时Ni-Ce-B仅有少量晶态Ni3B生成. 在673 K退火时, Ni -B样品中的Ni3B开始分解生成晶态Ni, 同时纳米晶Ni聚集并形成大颗粒晶态Ni, 而Ni-C e-B样品晶化生成晶态Ni3B和纳米晶Ni. 在773 K和更高的温度退火处理后,Ni-B样品中N i的局域环境结构与金属Ni箔基本一致,但Ni-Ce-B样品晶化生成的Ni晶格有较大畸变,同时Ni3B并未分解. 说明0.3%的Ce对提高Ni-Ce-B样品的稳定性有显著作用. 本文首次报道了Ni-B和Ni-Ce-B超细非晶态合金中苯加氢催化活性中心为纳米晶Ni和类似于金属Ni的 Ni-B非晶态合金.

关键词: X射线吸收精细结构 , X射线衍射 , 差热分析 , 镍 , 硼 , 铈 , 超细非晶态合金 , 苯 , 加氢

Synthesis, Characterization and Gas Sensing Properties of In（OH）3 and In2O3 Nanorods through Carbon Spheres Template Method

材料科学技术（英文）

关键词: 模板方法 , 碳球 , 表征 , 透射电子显微镜 , 合成 , 属性 , 气敏 , X射线衍射

Effect of Doping and High-Temperature Annealing on the Structural and Electrical Properties of Zn1-xNixO（0≤X≤0.15） Powders

材料科学技术（英文）

关键词: 晶体结构 , 高温退火 , 电气性能 , 粉末 , 兴奋剂 , 扫描电子显微镜分析 , 合成样品 , X射线衍射

Effect of Oxygen Partial Pressure on Phase Equilibria and Liquidus in CaO-Al2O3-FeOx System

钢铁研究学报(英文版)

关键词: 电解氧化 , 氧气分压 , 相平衡 , 分压力 , 液相 , 系统 , Al2O3 , X射线衍射

High-Temperature Oxidation Behavior of a Ni-Cr-W-Al Alloy

材料科学技术（英文）

关键词: 高温氧化行为 , Al合金 , 高温抗氧化性能 , Cr2O3 , 镍铬 , 动力学测定 , X射线衍射 , Al2O3

Tempering Process to Improve Hardness Uniformity of Plastic Mould Steel

钢铁研究学报(英文版)

关键词: 硬度均匀性 , 塑料模具钢 , 回火工艺 , 冷却速率 , X射线衍射 , 奥氏体转变 , 混合组织 , 微观组织

IMPROVING THE SURFACE PROPERTY OF TC4 ALLOY BY LASER NITRIDING AND ITS MECHANISM

Y.L. Yang

金属学报(英文版)

The mixing technology of laser and heated nitrogen was applied to improve the surface hardness of titanium alloy (TC4). The samples were nitrided with laser power density of 6.5×105W·cm-2, the scanning speed various from 100 to 500mm·min-1. The nitrogen gas was pre-heated to 300℃ to accelerate the nitriding process. Some interested samples were tested with XRD method (X-ray diffraction) to analyze the composition of nitrides, and the surface hardness of HV was measured. The results show that TiN and Ti2N were formed on the surface of Ti alloy with proper nitriding parameters, but TiN is the main composition. The surface hardness increased by three times, which is from the original value of 269 to 794kg·mm-2. The mechanism of the mixing technology is considered mainly of the activation of nitrogen by laser power and the pre-heated process which accelerated the nitriding process. The nitridation process can be considered as six steps given in detail. The result by analyzing the mechanism of improving the surface property of TiAl alloy shows the improvement of surface property due to two factors: the first reason is the result of laser annealing, and the second one is the formation of TiN.

关键词: laser nitridation , 表面硬度 , 钛合金 , X射线衍射

高炉喷吹煤粉质量分布和组分特性关系的研究

焦红光 , 刘鹏 , 陈清如

钢铁

为了解磨制高炉喷吹煤粉的质量分布和组分特性间的关系,以洛阳某矿生产的原煤为样品磨矿制粉,采用X射线衍射仪和振动样品磁强计分别考察了不同粒度级煤粉的质量状况(灰分、硫分和比磁化率等指标),进而研究了不同粒度级煤粉的组分特性.发现磨制高炉喷吹煤粉的灰分、硫分和比磁化率均随煤粉颗粒粒径减小而递减;而这种规律是由于煤系矿物质同煤基质之间可磨性和磁性的差异造成的,在此基础上结合煤粉制备系统提出了回粉干式磁选新工艺.

关键词: 高炉喷吹煤粉 , 粒度 , 硫分 , 灰分 , 比磁化率 , 磁选 , X射线衍射