WANG Zhao-cai
,
CHU Man-sheng
,
LIU Zheng-gen
,
CHEN Shuang-yin
,
XUE Xiang-xin
钢铁研究学报(英文版)
After taking into account the conditions of the domestic iron resources and the non-coking coal resources, the process of coal gasification-shaft furnace is an effective way to develop direct reduction iron in China. The following tasks are very critical to choose suitable process of shaft furnace and gasification, including the production of oxidized pellets with excellent comprehensive properties as well as the study of the reaction behavior and mechanism of swelling. The results showed that the oxidized pellets of using domestic magnetic iron concentrate as raw materials have favorable comprehensive properties, including higher mechanical strength both before and after reduction, faster reduction rate and lower reduction swelling index (RSI). All of these properties can meet the shaft furnace yielding requirement. When the temperature was below 1223 K, the pellets′ RSI was lower than 20%. With increasing of the content of H2 in atmosphere, the pellets reaction rate accelerated, crushing strength enhanced and RSI decreased. The RSI dropped to 10.26% at 1323 K in 100% H2 atmosphere, and it is up to 39.88% in 100% CO atmosphere. The iron grains mainly presented in platelike when pellets were reduced by H2, however, in CO atmosphere the iron grains were precipitated in flocculent. The whisker shape of iron grains and heating effects of reduction reaction are the major factors leading to the poor pellets strength and increase of RSI. Appropriately controlling the temperature and increasing the ratio of H2 to CO in atmosphere are good for dropping the RSI.
关键词:
oxidized pellet
,
shaft furnace
,
direct reduction
,
reduction swelling
Journal of Materials Research
The morphology of the dark and bright regions observed by transmission electron microscopy for the Zr(64.13)Cu(15.75)Ni(10.12)Al(10) bulk metallic glass strongly depends on the ion beam parameters used for ion milling. This indicates that the ion beam could introduce surface fluctuation to metallic glasses during ion milling.
关键词:
room-temperature
张宝艳
,
陈祥宝
,
李敏
,
邢丽英
,
汪亮
,
蒋诗才
航空材料学报
doi:10.3969/j.issn.1005-5053.2002.01.008
探讨了树脂基体、碳纤维增强体以及树脂基体-纤维的界面等对双马来酰亚胺(简称双马)树脂基复合材料冲击后压缩强度(CAI)值的影响,指出降低树脂基体的交联密度和产生微观两相结构是提高碳纤维/双马复合材料CAI值的两个典型方法.合适的树脂含量有利于保持复合材料体系较高的CAI值,采用高强高韧性的碳纤维可明显提高复合材料体系的CAI值.为获得较高的CAI值,保持合适的树脂基体-纤维界面性能也是必要的.
关键词:
双马来酰亚胺
,
纤维增强复合材料
,
韧性
,
界面
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....
关键词:
Europhysics Letters
Noncollinear magnetic investigations of the ground state in PrFeAsO have been performed by the density-functional theory. We calculated the total energy and made structure optimization, and the electronic density of states of PrFeAsO was analyzed. There are three different magnetic structures in PrFeAsO defined by experiments. Based on these magnetic structures, we studied four collinear and four noncollinear cases. The ground state is found to take the ordering proposed by Zhao, in which the FeAs plane is of stripe antiferromagnetism and Pr spins are perpendicular to Fe spins. The electronic density of states indicates that for PrFeAsO the increase of the electron Coulomb interaction leads to a decrease in conductivity. Copyright (C) EPLA, 2011
关键词:
high-temperature superconductivity;phase-diagram;oxypnictides;instability
段友社
,
郭书良
,
吴刚
,
侯军生
复合材料学报
基于热压罐成型工艺,选择了树脂柱Z向增强泡沫芯材、碳纤维Z向增强泡沫芯材、Kevlar纤维缝纫增强泡沫芯材3种Z向增强复合材料结构,对夹芯结构进行了低速冲击损伤和冲击后压缩（CAI）性能研究,考察了不同Z向增强方式对冲击损伤面积和破坏模式的影响。结果表明,Z向增强对泡沫芯材产生了初始损伤,其冲击后损伤面积大于未增强泡沫夹芯结构;但Z向增强改变了夹芯结构的压缩破坏机制。通过选用合适的Z向增强材料和Z向增强参数,能够提高夹芯结构的压缩强度和CAI强度。其中当增强材料为碳纤维,增强参数为10mm×10mm时,压缩强度提高了13%,CAI强度提高超过40%。
关键词:
复合材料
,
泡沫夹芯
,
Z向增强
,
冲击损伤
,
冲击后压缩
张子龙
,
程小全
,
益小苏
复合材料学报
doi:10.3321/j.issn:1000-3851.2002.05.021
为了考察一种小试件CAI试验方法的有效性,本文作者对复合材料层合板的准静态横向压缩特性和损伤,以及损伤后的压缩破坏进行了试验研究,采用C扫描、热揭层等技术对层合板内的损伤进行测量,并将含准静态横压损伤层合板的剩余压缩强度与低速冲击后板的压缩强度进行了比较.结果表明:在横压过程中存在分层损伤起始门槛压缩载荷值或压入深度值,以及横压载荷极限值;小板试件各界面的分层面积沿厚度方向的分布和继后的压缩破坏形式等与SACMA的CAI试验标准的情况相异.
关键词:
复合材料层合板
,
低速冲击
,
准静态横向压缩
,
损伤
,
压缩破坏
材料科学技术（英文）
The effect of interstitial hydrogen on the cohesion of the Al Sigma=11(113) grain boundary (GB) is investigated based on the thermodynamic model of Rice-Wang using the first-principles density function calculation. The results indicate that interstitial H behaves as an embrittler from "strengthening energy" analysis. The reduced GB cohesion due to the presence of H at the GB is attributed to the low affinity between H and Al, and the weakened bonding of Al atomic pairs perpendicular to GB plane.
关键词:
hydrogen;grain boundary;Al-Mg alloys;pseudopotentials;1st-principles
Xiaoguang LIU
,
Xiaowei WANG
材料科学技术（英文）
The effect of interstitial hydrogen on the cohesion of the Al ∑=11(113) grain boundary (GB) is investigated based on the thermodynamic model of Rice-Wang using the first-principles density function calculation. The results indicate that interstitial H behaves as an embrittler from "strengthening energy" analysis. The reduced GB cohesion due to the presence of H at the GB is attributed to the low affinity between H and Al, and the weakened bonding of Al atomic pairs perpendicular to GB plane.
关键词:
Hydrogen
,
null
,
null
