共查询到20条相似文献,搜索用时 140 毫秒
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采用SHS/PHIP工艺制备了致密的TiC-Al2O3-Fe系金属陶瓷,研究了延迟时间,高压特续时间,压力及Fe含量对合成TiC-Al2O3-Fe金属陶瓷实度的影响,结果表明,采用SHS/PHIP技术制备了TiC-Al2O3-Fe系金属陶瓷时,合成产物中气体的排放,液相的存在及组成相之间的润湿性是制备密实材料的关键。 相似文献
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用TEM、X-Ray、SEM等技术研究了Ni42Cr6Fe玻封合金在高温湿H2中形成的氧化膜及氧化物晶须的结构。结果表明:氧化膜主要由Cr2O3和(Fe,Mn)Cr2O4两组相成,氧化膜底层是以Cr2O3为主的组织,氧化膜表层是以(Fe,Mn)Cr2O4为主的组织;Si在氧化膜与合金界面分布,Al则在内氧化层中形成内氧化物质点;氧化膜表面生长的氧化物晶须的杆部为(Fe,Mn)Cr2O4单晶,头部为 相似文献
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激光气相合成氧化铁超细粉 总被引:6,自引:0,他引:6
本文采用激光气相反应法,以脉冲CO2激光器为光源、Fe(CO)2/O2为反应物,合成了Fe2O3超细粉,并发现制备的γ-Fe2O3超细粉呈规则的正多边形晶体,研究了该粉体生成的条件和特性,本法具有良好的工业应用前景。 相似文献
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SnO2气敏薄膜在SnO2/Fe2O3双层结构中成核及生长过程的模拟 总被引:4,自引:0,他引:4
用SEM对SnO2/Fe2O3样品的断面结构进行了观察研究,发现SnO2是在Fe2O3柱状结构的间隙中开始生长的,据此提出了双层膜结构生长热力学模型,由模型推出的结论与实验结果吻合。计算结果表明,SnO2在Fe2O3薄膜的间隙中生长速度很快,而后逐渐变慢,达到稳定沉积速率,在这种沉积速率下形成SnO2的柱状结构。SnO2膜的这种沉积方式使得Fe2O3与其接触面积很大,两者结合十分牢固。 相似文献
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亚铁盐氧化法合成纺锤形α—Fe2O3微粒条件的研究 总被引:6,自引:0,他引:6
硫酸亚铁空气氧化直接合成α-Fe2O3是备制均分散异形α-Fe2O3微粉的新方法。本研究通过XRD、TEM、化学分析等方法考察pH值对合成过程及产物的影响并确定其最佳合成条件。 相似文献
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锌—铁合金镀层耐蚀性探讨 总被引:6,自引:2,他引:4
采用扫描电子显微镜,X-射线衍射仪,分析了酸性氯化钾Zn-Fe合金电镀层的结构。讨论了纯化膜、镀层结构及镀层含铁量对镀层耐蚀性的影响。研究表明,由于钝化膜中微量铁的存在,使Zn-Fe合金镀层的耐蚀性优于纯锌镀层,而含(0.2 ̄0.3)%Fe的Zn-Fe合金耐蚀性最佳。 相似文献
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TiO2纳米管阵列膜的制备及对304不锈钢的光生阴极保护效应 总被引:1,自引:0,他引:1
应用电化学阳极氧化法在Ti表面构筑不同的TiO2纳米管阵列膜。采用XRD、SEM、XPS表征薄膜的结构、形貌和组成。通过电化学阻抗谱及电位随时间变化的测试,考察TiO2薄膜的光生阴极保护效应。结果表明薄膜主要由锐钛矿型的TiO2纳米管阵列组成,当304不锈钢耦连于紫外光照下的TiO2薄膜电极时,其界面反应电阻变小,电极电位显著降低,说明TiO2纳米管薄膜能够对不锈钢产生良好光生阴极保护效应,特别是掺Fe的TiO2薄膜在光照时可使不锈钢电位降低约450mV,而且在暗态时也能较长时间保持对不锈钢的阴极保护作用。 相似文献
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利用同步辐射光电子能谱技术详细研究了Fe/GaAs(100)的界面反应和电子结构。在界面处,Fe与As形成稳定的化学键,而Ga则溶解到Fe薄膜中形成合金,但反应只能在界面处发生,形成窄的反应层。Fe沉积后改变了GaAs表面的电子结构,重新钉扎了费米能级位置,引起费米能级向价带顶移动0.27eV。另外,Fe的生长模式在沉积过程中发生改变,而且存在As和Ga的扩散现象,同步辐射价带谱也证实了这一点。 相似文献
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Wenming Jiang Guangyu Li Zailiang Jiang Yao Wu 《Materials Science & Technology》2018,34(12):1519-1528
The Al/Fe bimetallic castings were prepared by the compound casting combined with hot-dip galvanising and aluminising, and the effect of the heat treatment on microstructures and mechanical properties of the Al/Fe bimetallic castings was systematically studied in the present work. The thickness of the reaction layer of the Al/Fe bimetallic castings continuously increased with increasing solution temperature or prolonging solution time. However, the excessive solution temperature and solution time promoted cracks of the reaction layer. Regardless of as-cast or heat treatment, there were respectively the Fe2Al5, Al9Fe4Si3, FeAl3, Al8Fe2Si and Al4.5FeSi phases in the reaction layers. The nano-hardnesses of the reaction layer after heat treatment exhibited an increase compared to that of the as-cast condition. 相似文献
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硼掺杂金刚石薄膜电极电化学特性的研究 总被引:2,自引:0,他引:2
本文用未经任何表面处理的硼掺杂金刚石薄膜为电极材料,采用循环伏安法和计时电流法检测含K3Fe(CN)6的KCl和HCl-KCl溶液的响应电流,对电极的基本特性,如响应时间,稳定性等进行了研究;同坟也对溶液pH值变化与因而造成的响应电流变化进行了研究。从与玻碳电极比较的角度出发,分别在含汞的酸性KCl-HNO3和中性KCl体系中,在一定电位下预富集铅,而后用阳极扫描法检测Pb-Hg的溶出峰电流,对金 相似文献
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为了进一步明确X100管线钢在含硫酸盐还原菌(SRB)海滨盐碱土壤中的耐蚀性,采用表面分析技术、电化学技术和失重法,研究了SRB对X100管线钢腐蚀过程与行为的影响。结果表明:X100管线钢在有无SRB海滨盐碱土壤中的腐蚀均属于中度腐蚀,无SRB时腐蚀产物主要为Fe_2O_3,Fe_3O_4和γ-Fe O(OH),有SRB时腐蚀产物主要为Fe_2O_3,Fe_3O_4,α-Fe O(OH)和Fe7S8;SRB代谢形成的活性生物膜影响了X100管线钢的腐蚀行为,随着腐蚀时间的增加,SRB可在X100管线钢表面形成由微生物膜与腐蚀产物结合的膜,其更加致密,对腐蚀传质具有物理阻碍作用,可以减缓X100管线钢的腐蚀;无SRB菌时X100管线钢表面的腐蚀产物疏松多孔并分布有裂纹,且对基体的保护作用差,其腐蚀速率大于有SRB时的值;SRB的代谢活动抑制了X100管线钢的腐蚀。 相似文献
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添加Fe3+对二氧化钛薄膜吸收光谱及光催化活性的影响 总被引:4,自引:0,他引:4
用阳极氧化法制备多孔状的纳米晶二氧化钛薄膜,通过往阳极氧化的电解液中添加Fe3 ,使其进入二氧化钛薄膜中,研究了掺杂Fe3 对二氧化钛薄膜吸收光谱和光催化活性的影响.在阳性氧化时通过往电解液中添加不同含量的Fe3 可以制得掺杂Fe3 浓度不同的薄膜,研究了掺杂Fe3 浓度不同对薄膜吸收光谱和光催化活性的影响.用X射线衍射、扫描电子显微镜、紫外-可见吸收光谱仪和X光电子能谱对薄膜进行了表征.实验发现掺杂Fe3 使二氧化钛薄膜对入射光的吸收带边发生红移,讨论了其作用机制. 相似文献
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The nanostructured FeNi thin films were deposited on a polycrystalline Cu substrate by reducing constituent metal salts in refluxing ethylene glycol. The effect of substrate position was investigated. During deposition, the substrate was subject to one of the following processes: (a) complete immersion in solution, (b) repeated immersion followed by suspension above solution (denoted as quenching), and (c) suspension above the solution. Compared to the conventional polyol synthesis of FeNi where Fe concentration could not exceed 30 at%, the quenching process dramatically increased Fe at% to above 40%. Complete suspension of substrate above the solution resulted in Fe-rich films where Fe at% >90%. The microhardness, adhesion, and magnetic properties of deposited films showed a strong dependence on the long-range and short-range order of the film, which, in turn, depended on the substrate position. Quenched films with ordered local Ni environment and higher crystallinity had the highest Vickers hardness, best adhesion to substrate, and largest saturation magnetization compared to those deposited on substrates placed in other positions. The oxidation of Fe occurring in the vapor deposition significantly affected the film properties. 相似文献
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This paper examined the potential of using Pd/Fe bimetallic nanoparticles to dechlorinate chlorinated methanes including dichloromethane (DCM), chloroform (CF) and carbon tetrachloride (CT). Pd/Fe bimetallic nanoparticles were prepared by chemical precipitation method in liquid phase and characterized in terms of specific surface area (BET), size (TEM), morphology (SEM), and structural feature (XRD). With diameters on the order of 30-50 nm, the Pd/Fe bimetallic nanoparticles presented obvious activity, and were suited to efficient catalytic dechlorination of chlorinated methanes. The effects of some important reaction parameters, such as Pd loading (weight ratio of Pd to Fe), Pd/Fe addition (Pd/Fe bimetallic nanoparticles to solution ratio) and initial pH value, on dechlorination efficiency were sequentially studied. It was found that the maximum dechlorination efficiency was obtained for 0.2 wt% Pd loading. The dechlorination efficiency was observed to increase with increasing Pd/Fe addition. The optimal pH value for dechlorination reaction of chlorinated methanes was about 7. Kinetics of chlorinated methane dechlorination in the catalytic reductive system of Pd/Fe bimetallic particles were investigated. The dechlorination reaction complied with pseudo-first-order kinetics. 相似文献
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