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Identification of Complex Ions of Nb(V)in FLINAK-O2-System by Infrared Spectra王新东,段淑贞,ChristensenE.,BjerrumN.J.摘 要:<正> The FT-IR spectra for K2NbF7-FLINAK-O2- solution were measured and compared with the spectraof crystalline K2NbF7 and K2NbOF6.The results show that the niobium fluoro-complex and/oroxyfluoro-complex ions are presented......
that annealing in low vacuum resulted in oxygen penetration into the multilayers as revealed by auger electron spectroscopy, but hardly changed metallic sheet resistivity. XRD results suggested that some niobium... distribution of nano-scale niobium oxides and interstitial oxygen in the multilayers. In addition, interfaces between adjacent layers were more distinct after annealing which indicated good thermal stability......
="ChDivSummary">The in situ synthesized NbC particles reinforced Ni-based alloy composite coating was produced by laser cladding a precursor mixture of Ni-based alloy powder,graphite and niobium powders... via in situ reaction between niobium and graphite in the molten pool during the laser cladding process and they are commonly precipitated in three kinds of morphologies,such as quadrangle,cluster......
">By careful design of rolling schedule,ultra-fine (~2μm) ferrite grains in a low carbon high niobium (0.09wt%Nb) micro-alloying steel with average austenite grain sizes above 800 μm can be achieved......
Effect of annealing on two different niobium-clad stainless steel PEMFC bipolar plate materials Sung-Tae HONG1, Dae-Wook KIM2, Yong-Joo YOU2, K. Scott WEIL3 1. School of Mechanical...; Abstract: Niobium (Nb)-clad stainless steels(SS) produced via roll bonding are being considered for use in the bipolar plates of polymer electrolyte......
forTi3Al-12Nb-1.5Mo in a 50% NaOH-10%FeCl3 solution, respectively. Corrosion resis-tance decreased with niobium content in the composites and chloride content in theaqueous solution. Selective corrosion of α2 phase in a matrix occurred in the corrosionenvironment which suggests that the corrosion potential and rate changes are relatedto the niobium content and α2 phase in a matrix. Key words:Ti3Al alloy......
世界采矿冶金大事记(五)梅建军摘 要:<正> 1800年,英国人斯坦诺普发明最早的全铁制印刷机,即斯坦诺普印刷机. 同年,军事工业开始使用金属锑制造榴散弹. 1801年,英国化学家哈契特(C.Hatchett)在分析矿石时发现一种新元素,因矿石来源于哥伦比亚(Columbia),故将新元素命名为Columbium(钶).1844年,德国化学家罗斯(H.Rose)宣称发现一种性质与金属钽(tantalum)很相似的"新"元素,因钽是以希腊神话人物Tantalus命名的,所以就以Tantalus女儿Niobe(尼奥柏)的名字给新元素定名为niobium(铌),1866年确定钶和铌是同一个元素.1951年国际化学联合关键词:......
reduced to Nb in molten salt, experiencing some intermediate products of calcium niobates and niobium suboxides. Nb metal obtained was converted to NbC with assistance of carbon. The reduction of Nb oxides... reduction; molten chloride; calcium niobates; acid leaching 1 Introduction Niobium carbide (NbC) is a non-oxide ceramic material primarily used as the starting material for the commercial production......
A new sol-gel process for preparing Ba(Mg1/3Nb2/3)O3 nanopowdersLIAN Fang, XU Lihua, LI Fushen, and ZHAO Hailei摘 要:<正> Commercially available niobium (V) oxide [Nb2O5], with barium acetate [Ba(CH3COO)2] and magnesium acetate [Mg(CH3COO)2-4H2O] was used as the starting material in the sol-gel process for preparing Ba(Mg1/3Nb2/3)O3 (BMN) nanopowders......
flowsheet were analyzed;process flows and parameters which could give consideration to four kinds of components were determined.TFe,rare earth oxide(REO),niobium and fluorite recoveries could reach......
