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. The segregation of casted single crystal superalloy is severe. The chromium, cobalt and tungsten are dendritic segregation, while the aluminum and tantalum are interdendritic segregation. Key words: Ni......
on freckle prevention, tantalum also has beneficial effects though not as pronounced as hafnium; aluminum and rhenium have the stronger promoting effect on freckles, and tungsten is the second. Key......
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and hydrophilic conversion rate, and is expected to possess good biological properties. Key words: titanium; TiO2; sol-gel; tantalum; corrosion; hydrophilicity 1 Introduction Titania films are widely studied... in dopant introduction, and the relative ease of processing. The studies on tantalum and tantala as biomaterials have drawn much attention in recent decades. Endothelial cells grow much better......
; FactSage software 1 Introduction Niobium is a V sub-group element in periodic table with similarity to tantalum in physical and chemical properties. The largest application of the two metals... F, HARRELL W R, LESSNER P. Electrical characterization of high voltage polymer tantalum capacitors [J]. Journal of the Electrochemical Society A, 2012, 159(10): A1646-A1651. [3] HE Ji-lin. New......
差也达到了7°；(001)[]取向的晶粒中形成的位错亚结构之间的取向差小很多,取向差最大也只有2.2°,平均取向差只有1.7°. (4) 样品沿横向和轧向拉伸开启的滑移系是不一样的,因此在拉伸变形时表现出各向异性. 参考文献: [1] Gladczuk L, Patel A, Demaree J D, et al. Sputter deposition of bcc tantalum films with TaN underlayers for protection of steel[J]. Thin Solid Films, 2005, 476(2): 295-302. [2] Choi Good-Sun, Lim Jae-Won, Munirathnam N R, et al. Preparation of 5N grade tantalum by electron beam......
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...同样只适宜控制在40%~60%之间,该区间内仲辛醇体积分数对钽,铌和钨的回收率也显著低于其最大值. 图2 仲辛醇体积分数对钽,铌和钨萃取率及分相时间的影响 Fig. 2 Effect of secondary octanol volume fraction on extraction rate and phase separation time of tantalum......
; 1 Introduction In nature, niobium almost invariably occurs as complex oxide minerals in association with tantalum. The most common geological occurrence of both suits... by 1.6% calcium, which was detected in the final product. Only 4.3% tantalum was transferred to the extractant while 4% uranium and 0.2% iron were extracted but none of the mentioned elements were......
生, 等. 铌与钽[M]. 长沙: 中南工业大学出版社, 1997: 19. MA Fu-kang, QIU Xiang-dong, JIA Hou-sheng, et al. Niobium and Tantalum[M]. Changsha:Central South University Press, 1997: 19. [2]李国栋, 熊翔, 黄伯云. 温度对CVD-TaC涂层组成... composite material[J]. Rare Metal Materials and Engineering, 2004, 33(5): 490-493. [6]Sinani I L, Chuzhko R K,Chernikov Y P. Growth kinetics of tantalum carbide layers produced on graphite by pyrolysis......
