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(Shandong Academy of Sciences)3. Inner Mongolia Niobium Metallurgical Engineering Laboratory, Baotou Research Institute of Rare Earths摘 要:Phase equilibria......
fraction on extraction rate and phase separation time of tantalum, niobium and tungsten 2.1.2 仲辛醇体积分数对萃取率和分相时间的影响 以磺化煤油作仲辛醇稀释剂,控制氢氟酸浓度为6 mol/L,硫酸浓度为4 mol/L,相比为1:1,温度为25 ℃,萃取时间为3 min,仲辛醇体积分数对钽铌回收率,钨回收率和..., niobium and tungsten 2.1.3 TBP/仲辛醇配比对萃取率和分相时间的影响 在不添加磺化煤油条件下,调节TBP/仲辛醇体积比,控制氢氟酸浓度为6 mol/L,硫酸浓度为4 mol/L,相比为1:1,温度为25 ℃,萃取时间为3 min,TBP/仲辛醇的体积配比对钽铌回收率,钨回收率和分相时间的影响如图3所示. 由图3可知,钽铌回收率随TBP/仲辛醇体积比的增加而微......
from Fig.2(b) that the inner diameter of the tube is approximately 80 nm and like the diameters, as previously reported, of zirconium oxides nanotube arrays or porous niobium oxides [12–15... electrolyte. From the EDS spectrum, as Fig.3 shows, it is concluded that the oxide layer on the TLM alloy consists of titanium, niobium, molybdenum and zirconium oxides. 3.2 Annealing treatment The oxide......
of Tantalum and Niobium Materials,Shizuishan 753000,China;3. CNMC Ningxia Orient Group Co.,Ltd.,Shizuishan 753000,China)Abstract:The effects of additives,pH value and solid content on the stability......
process[J]. Trans Nonferrous Metals Soc China, 2006, 16(s1): s239-s244. [3] 冯景苏. 铌应用的新进展[J]. 稀有金属材料与工程, 1994, 23(3): 7-12.FENG Jing-su. New progress of applications of niobium[J]. Rare Metal..., Lipsitt H A. The balance of mechanical and environmental properties of a multielement niobium-niobium silicide-based in situ composite[J]. Metall Mater Trans A, 1996, A27: 3801-3808. [10] Vialsi M......
,Nb205的浸出率随反应温度的提高而降低,且KOH浓度越高,获得高浸出率的温度范围越宽. 4)实验中得到的不溶性铌酸盐沉淀经ICPAES和XRD分析证明为KNb03. REFERENCES [1]Miller G L.Tantalum and Niobium[M]. London: But- terworths Scientific.... [3] EFHussaini o M, Mahdy M A E.Extraction of niobium and tantalum from nitrate and sulfate media by using MIBK[J].Min Pro Ex Rev, 2001, 22: 633 - 650. [4] 佴季林,张宗国,徐忠亭,中国钽铌湿法冶金[J]．稀 有金属材料与工程,1998(1):9......
, such as Cr, Nb and Ta[6]. BOTCHAROVA et al[6-8] showed that an extremely fine nanocrystalline microstructure and a dissolution of up to 10% (molar fraction) for niobium in the copper lattice can be achieved... with thermodynamics law. Furthermore, Nb will react with O, and form niobium oxide. Once the niobium oxide forms, the lattice parameter of the Cu matrix will decrease as Nb precipitates from the Cu matrix......
described elsewhere in detail[25] and those model parameters of niobium are listed in Table 1. Table 1 Model parameters of MAEAM for Nb(111) 3 Results and discussion 3.1 Surface relaxation of Nb... to the melting point of bulk niobium. The number N increased with the incremental temperature, which is displayed in Fig.3. The vertical and horizontal coordinate denoted the number N and the natural logarithm......
most of the requirements for an orthopedic implant, which consist of β stable elements, such as molybdenum, silicon, niobium, zirconium and tantalum. Researchers reported that the moduli..., corrosion resistance and biocompatibility are the most important characteristics expanding the use of alloys as biomaterials [7]. The addition of niobium (Nb) could increase the corrosion resistance......
of vanadium and molybdenum and so on as strong β stabilizing elements was accelerated with the advance of aging temperature. Thus, the content of niobium in α2 phase was increased and unstable. According to the investigation of WU et al [25], as the niobium element reached a critical value, α2 phase can be changed from the HCP lattice type to the orthorhombic. It is a phase transformation from......
