To obtain complex carbides of niobium and tantalum (examples 3-5) used a bimetal hydroxide niobium - tantalum containing 51,71 wt.% Ta2O5and 23,86 wt.% Nb2O5. In example 3, the hydroxide is thermally treated at 900°C to the total content of the oxides of niobium and tantalum, is equal to 100 wt.% In examples 4 and 5 the same source hydroxide niobium and tantalum after heat treatment at 300°C contained 90,7 wt.% oxides. In example 5, carbidization products was performed in vacuum by heating to 1200°C for 10 hours
EFFECT: obtaining possibility to create coating with controlled density on articles of complex form and refractory carbides of higher purity at lower temperature of synthesis and high dispersibility of obtained product particles.
Synthesis of Niobium Carbide (NbC) by Powder …
A feasible study on a novel production process of niobium carbide (NbC) from its low cost resource ferroniobium at low temperature was examined by means of mechanochemical and subsequent chemical separation method. NbC powders as well as metallic iron (Fe) were synthesized from ferroniobium (FeNb) and graphite (C) powders by using a planetary mill at milling speed of more than 600 rpm with FeNb : C molar ratio of 1 : 1. Then NbC particles were effectively separated from the mixed powders by leaching with HCl after the heat-treatment of the mixed powders in argon. These experimental results were consistent with the thermodynamic prediction.
Niobium carbide (Nb C and Nb 2 C) is an ..
Known polymer composition to obtain a superfine refractory carbides, comprising the hydrolysis product of an organic solution prepared by mixing the metal-containing complex compounds with polymers. Speed drying at temperatures from 20 to 250°C, the pyrolysis in an inert or reducing atmosphere at 350 to 600°C, carbothermic synthesis in the temperature range of 600-1200°C and at a pressure of 10-1-104PA from the specified composition get monocarbide zirconium, tantalum and mixed-phase carbide tantalum-hafnium in the form of fine powders for coatings and composites on their basis [RF Patent №2333888, bull. No. 26, 20.09.2008 "Method for high dispersion of refractory carbide coatings and composites on their basis"; Sevastyanov Century, and other Low-temperature synthesis of TaC through transparent tantalum - carbon-containing gel // Inorganic materials, 2010. - So 46. No. 5. - S. 563-569; Simonenko E. P. and other Synthesis of high smartparlay carbides of tantalum-zirconium Ta4ZrC5and tantalum-hafnium Ta4HfC5through the Sol-gel technique // Journal of n is in organic chemistry, 2011. , 56(11). - S. 1763-1769].
Tantalum Carbide or Niobium Carbide Catalyzed …
, 113, 2359 (2015)
Template Synthesis of Linear-Chain Nanodiamonds Inside Carbon Nanotubes from Bridgehead-Halogenated Diamantane Precursors
Yusuke Nakanishi, Haruka Omachi, Natalie A.
Niobium carbide (Nb C and NbC) is an ..
Comm., 50, 524 (2014)
Metal catalyst-free mist flow chemical vapor deposition growth of single-wall carbon nanotubes using C60 colloidal solutions
Yun Sun, Ryo Kitaura, Jinying Zhang, Yasumitsu Miyata and Hisanori Shinohara
, 68, 80 (2014)
Synthesis of refractory conductive niobium carbide nanowires within the innner space of carbon nanotube templates
Keita Kobayashi, Ryo Kitaura, Qing Wang, Ikuya Wakamori, Hisanori Shinohara, Satoshi Anada, Takeshi Nagase, Takeshi Saito, Masaharu Kiyomiya and Hidehiro Yasuda