共搜索到7210条信息，每页显示10条信息，共721页。用时：0小时0分1秒637毫秒
Morphology and structure of high temperature MoSi2 coating on niobium XIAO Lai-rong(肖来荣), YI Dan-qing(易丹青), YIN Lei(殷 磊), CAI hi-gang(蔡志刚) (College of Materials Science and Engineering... milling. A sheet of pure niobium(99.9% in mass fraction) was rolled to 2mm in thickness, and cut into pieces of 8mm×10mm. The sample surface was pretreated, and then was dropped into the slurry to cover......
; 1 Introduction In nature, niobium almost invariably occurs as complex oxide minerals in association with tantalum. The most common geological occurrence of both suits... of bidentate 2-pyridinol-N-oxide with hydrated niobium(V) oxide[8]. IV?I? and TAMHINA[9] separated niobium(V) from zirconium(IV) and hafnium (IV) in the aqueous hydrochloric and sulphuric acid solutions......
Effect of niobium alloying level on the oxidation behavior of titanium aluminides at 850°CAlexandra Banu1,Nicolae Ionescu11. Faculty of Engineering and Management of Technological Systems... and microcracks were formed as a result of oxygen diffusion through the external oxide layer formed during thermal oxidation for 100 h.关键词:......
in this study was enabled to prepare niobium boride powders with high efficiency, small particle size and high purity by using low cost oxide raw materials. In this study, niobium boride powders... the formation of the pure niobium boride powders from oxide reactants at room temperature thanks to the effect of mechanical milling. 2 Experimental Niobium oxide (Nb2O5, Alfa AesarTM, purity 99.5%, average......
Rare Earths, Niobium and Tantalum Minerals in Bayan Obo Ore Deposit and Discussion on Their Genesis 张培善1,宋仁奎1,陶克捷1,杨学明1,杨主明1 (1.Institute of Geology and Geophysics, Chinese Academy of Sciences.... It is obviously that some minerals are strata minerals and some are post-strata minerals. The rare earths, niobium and tantalum minerals are exactly the post-strata minerals. In these minerals......
......
On Niobium Reduction in Blast Furnace董一诚,杨天钧,孟涛,王振峰摘 要:<正> The Baotou Iron Ore of China contains very high niobium. This paper reported the results through laboratory and practical experiments on niobium enrichment in blast furnace. The effect of temperature, constituents of slag and silicon content in hot metal on niobium recovery was studied......
THE ROLE OF NIOBIUM IN NICKEL-BASED SUPERALLOYS AND CHARACTERIZATION OF PM ALLOY EP741NP T. Carneiro1,D. Furrer2,J. Radavich3 (1.Reference Metals Co., Bridgeville, PA 15017, USA;2.Ladish Go., Inc., Gudahy, WI 53110, USA;3.Micro-Met Laboratories, West Lafayette, IN 47906, USA) Abstract:The role of niobium in nickel-based superalloys is reviewed. The importance of niobium as a strengthener......
impedes the growth of Ti5Si3 phase, and the formation of TiO2 on surface and on Ti5Si3 phase is also impeded. Key words: TiAl based alloy; niobium silicon alloying; isothermal oxidation behavior... temperature applications [J]. Intermetallics, 2005, 13: 952-958. [5] LU Wei, CHEN Chun-lin, XI Yan-jun, GUO Chang-you, WANG Fu-hui, HE Lian-long. TEM investigation of the oxide scale of Ti-46.5Al-5Nb at 900......
......
