反应等离子熔覆高铬铁基金属陶瓷增强耐磨涂层组织与性能

利用反应等离子熔覆技术、以Fe-Cr-C-W-Ni合金粉末为原料,在Q235钢表面制得了Cr7C3高铬铁基金属陶瓷增强耐磨复合涂层。利用SEM、EDS和X射线衍射分析了涂层的显微组织,在室温干滑动磨损试验条件下测试了涂层的耐磨性。结果表明:反应等离子熔覆Cr7C3高铬铁基金属陶瓷增强耐磨复合涂层硬度高、组织均匀、与基材之间为完全冶金结合;涂层在室温干滑动磨损试验条件下表现出优异的耐磨性,涂层磨损的质量损失随载荷增加十分缓慢,涂层具有优异的载荷特性。     

Experimental and FEM Study of Coated and Uncoated Tools Used for Dry Milling of Compacted Graphite Cast Iron

Compacted graphite cast iron (CGI) has been the material for high-power diesel engines recently, but its increased strength causes poor machinability. In this study, coated and uncoated carbide tools were used in dry milling experiment and FEM simulation to study the machinability of CGI and wear behaviour of tools. The experimental and FEM simulation results show that coated tool has great advantage in dry milling of CGI. SEM and EDS analysis of tool wear indicate the wear morphology and wear mechanism. Adhesive wear is the main mechanism to cause un-coated tool wear, while abrasive wear and delamination wear are the main mechanism to cause coated tool wear. Stress and temperature distribution in FEM simulation help to understand the wear mechanism including the reason for coating peeled off.     

铁配合物[Fe（C_（12）H_8N_2）_3]（C_6H_6N_2S_2O_6）·4H_2O的合成及晶体结构表征

采用水溶液法,合成了铁配合物[Fe（C12H8N2）3]（C6H6N2S2O6）.4H2O,该配合物晶体属三斜晶系,P-1空间群,晶胞参数是：a=12.8789（12）,b=13.3808（13）,c=14.859（2）,α=104.558（2）°,β=100.780（2）°,γ=107.5760（10）°,V=2264.8（5）3,Z=2.铁离子周围有6个由1,10-邻菲罗啉提供的氮原子与之配位形成畸变的八面体的配位构型.相邻结构单元中的邻菲罗啉分子存在着弱的π-π堆积作用,没有参与配位的邻苯二胺-3,5-二磺酸根离子与结晶水分子通过氢键将配合物扩展为二维超分子结构.     

Paving the road toward the use of β-Fe2O3 in solar water splitting: Raman identification,phase transformation and strategies for phase stabilization

Although β-Fe₂O₃ has a high theoretical solar-to-hydrogen efficiency because of its narrow band gap, the study of β-Fe₂O₃ photoanodes for water splitting is elusive as a result of their metastable nature. Raman identification of β-Fe₂O₃ is theoretically and experimentally investigated in this study for the first time, thus clarifying the debate about its Raman spectrum in the literature. Phase transformation of β-Fe₂O₃ to α-Fe₂O₃ was found to potentially take place under laser and electron irradiation as well as annealing. Herein, phase transformation of β-Fe₂O₃ to α-Fe₂O₃ was inhibited by introduction of Zr doping, and β-Fe₂O₃ was found to withstand a higher annealing temperature without any phase transformation. The solar water splitting photocurrent of the Zr-doped β-Fe₂O₃ photoanode was increased by 500% compared to that of the pure β-Fe₂O₃ photoanode. Additionally, Zr-doped β-Fe₂O₃ exhibited very good stability during the process of solar water splitting. These results indicate that by improving its thermal stability, metastable β-Fe₂O₃ film is a promising photoanode for solar water splitting.     

佝偻病儿童头发中铁、铜、钙、锌的分析

对61例健康儿和50例佝偻病儿童头发中铁、铜、钙、锌进行了测定,健康儿童头发中铁、铜、钙、锌分别为21．8μg/g、12．4μg/g、1682．6μg/g和143．6μg/g佝偻病儿童头发中铁、铜、钙、锌分别为21．6μg/g、12．3μg/g、781．2μg/g和84．5μg/g。     

中国铁矿石资源供应风险评价与治理研究

由于中国国内铁矿资源禀赋的约束,中国高度依赖进口铁矿的局面将长期存在。为了保证中国铁矿资源的供应安全,已有研究重点从中国铁矿石资源供需、贸易或定价的某一维度深入分析铁矿石资源供应风险,较少同时考虑供需、贸易和定价的综合性供应风险,相应地缺乏多维主体的铁矿石供应风险综合治理措施。本研究采用BGR-VW方法,基于2000—2015年中国铁矿石时间序列数据,从当前市场风险、资源风险、政治风险、市场权力、未来供需趋势等5个方面对中国铁矿石供应资源供应风险进行了综合评价。结果表明,中国铁矿石资源供应风险主要存在于资源和政治风险,综合风险等级处于紧张状态。最后,本文以实现铁矿石资源可持续供给为最终目标,从全球层面、区域层面和国家层面的多维主体分别提出相应治理措施。     

运动训练对优秀女子中长跑运动员铁代谢的影响

目的:探究女子中长跑运动员铁代谢的变化规律;方法:动态测定2个月训练内蒙古女子中长跑运动员的血红蛋白、血清铁、铁蛋白、转铁蛋白、转铁蛋白受体含量、红细胞分布宽度和促红细胞生成素水平;结果:优秀女子中长跑运动员训练期血红蛋白含量先下降后上升;血清铁含量具有先下降后上升趋势,但不显著;铁蛋白含量未见明显改变;转铁蛋白含量先升后降;转铁蛋白受体含量在训练中变化不明显;血红细胞分布宽度先升高后下降,EPO水平先升后降;结论:在训练初期,由于运动训练,机体铁代谢出现紊乱,而后通过调整恢复正常.     

IRON DETERMINATION AFTER ON-LINE SORBENT PRECONCENTRATION BY FI-FASS USING 1,10-PHENANTHROLINE AS A COMPLEXING AGENT

ＩＮＴＲＯＤＵＣＴＩＯＮＯｎ ｌｉｎｅｓｅｐａｒａｔｉｏｎａｎｄｐｒｅｃｏｎｃｅｎｔｒａｔｉｏｎｈａｖｅｒｅｃｅｉｖｅｄｃｏｎｓｉｄｅｒａｂｌｅａｔｔｅｎｔｉｏｎｉｎｆｌｏｗｉｎｊｅｃｔｉｏｎａｎａｌｙｓｉｓｃｏｕｐｌｅｄｗｉｔｈａｔｏｍｉｃａｂｓｏｒｐｔｉｏｎｓｐｅｃ ｔｒｏｍｅｔｒｙｄｕｒｉｎｇｒｅｃｅｎｔｙｅａｒｓａｎｄｉｓｗｉｄｅｌｙａｐ ｐｌｉｅｄｆｏｒｓｅｌｅｃｔｉｖｉｔｙａｎｄｓｅｎｓｉｔｉｖｉｔｙｅｎｈａｎｃｅｍｅｎｔ(Ｆａｎｇ ,1 995 ) .Ａｕｔｏｍａｔｉｏｎｏｆｔｈｅｓａｍｐｌｅｐ…     

巴润矿业公司选矿厂生产实践

随着我国各项建设的需要,钢铁的产量也迅速攀升。在这个快速发展的浪潮中,包钢集团公司为了加强自有矿山资源的利用,增加原料的自有率,减轻进口矿价格上升的压力,于2004年成立巴润矿业公司,2008年开始建设巴润矿业公司选矿厂,2009年11月开始试车,2010年7月达到设计产能。本文介绍了巴润矿业公司选矿厂生产中的实际生产情况以及生产中遇到的问题。     

电子手工焊接工艺及质量控制

在电子组装及科研、返工和返修中,特别是在产品以多品种和小批量为主的场合和家电维修中,手工焊接一直是不可缺少的操作手段。文章结合工程及教学实践分析了手工焊接的相关工艺要素、过程控制要点和手工焊接易产生的缺陷与原因,并提出了减少手工焊接缺陷的方法,有助于提高实际生产中手工焊接的质量和可靠性。