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Niobium carbide process

What is niobium carbide

Niobium carbide is a compound composed of carbon and niobium elements with the formula NbC. Niobium carbide is a rigid ceramic material with excellent mechanical properties and a high melting point. With high heat and corrosion resistance, it can maintain stability in high temperatures and extreme environments. Niobium carbide is commonly used to manufacture heat-resistant components and corrosion-resistant materials, such as high-temperature furnaces, refractories and ceramic cutters. Because of its high hardness and wear resistance, niobium carbide is also commonly used to manufacture cutting tools, abrasives and ceramic coatings. In the energy sector, niobium carbide is also used as a reactor component in the nuclear energy industry because of its better resistance to radiation and high temperatures. Niobium carbide, in general, is a relatively stable and non-volatile compound, so the direct harm to the human body is minor. However, niobium carbide powder can form fine particles during handling and processing, which may irritate the respiratory system after inhalation. Therefore, when handling niobium carbide powder, it is recommended to wear appropriate protective equipment, such as respirators and gloves, to avoid inhalation and contact. In addition, the niobium carbide grinding process will produce dust.


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Niobium carbide process

Usually, niobium pentoxide and carbon black as raw materials, niobium pentoxide and carbon black are fully mixed in a certain proportion into the graphite crucible, heated to 1600 ~ 1800 under hydrogen or vacuum conditions with a high-frequency electric furnace for carbonization, and then added carbon black so that it is fully mixed, and then heated to 1800 ~ 1900 under hydrogen or vacuum, for secondary carbonization. Columbium carbide is obtained. Or with metal niobium and carbon black as raw materials, the metal niobium powder and carbon black in proportion, after full mixing, heating in vacuum or hydrogen to 1600 ~ 1700, so that it is directly carbonized to obtain niobium carbide. The gas phase reaction method can also be used; that is, with niobium pentachloride vapor, hydrogen and methane mixture as raw materials, the mixture of niobium pentachloride vapor and hydrogen, through the temperature has reached 1000 or more tungsten wire, the formation of a metal niobium layer on the surface of the tungsten wire, continue to power so that the temperature rises to 1300, and then into the mixture of methane and hydrogen. The niobium is carbonized into niobium carbide and deposited on the surface of the hot tungsten wire, which is the product. Green cubic crystal, with a metallic luster, belongs to the sodium chloride cubic crystal system. Relative density 8.47, lattice constant a= 0.477 nm, melting point 2300. Microhardness >235GPa (>2400kg/mmz), harder than corundum. Elastic modulus 3.38 ×105N/mmz, thermal expansion coefficient 6.65 × IO-6 /K, thermal conductivity 14W/(m-K), heat of formation -140.7 kJ/mol. Specific heat capacity 36.8J /(mol.K), resistivity 35u.cm. A mixture of hot hydrofluoric acid and nitric acid. It is stable at 1000 ~ 1100 and rapidly oxidizes to niobium pentoxide above 1100.

 

Synthesis method of niobium carbide

Direct carbonization method: Ti powder and carbon powder reaction produce TiC. The reactant reacts with the hot tungsten or carbon monofilament in contact, and TiC crystals grow directly on the monofilament; TiC powder synthesized by this method, its yield, and sometimes even the quality is strictly limited, in addition, due to the strong corrosion of TiCl4 and HCl in the product, the synthesis should be particularly careful. Explosive impact method: titanium dioxide powder and toner were mixed in a proportion and pressed into a Φ10mm×5mm cylinder to prepare the precursor, with a 1.5g/cm3 density, which was loaded into a metal restrained outer cylinder in the laboratory. Put it into a self-made sealed explosion container for the experiment, and collect detonation ash after explosion shock wave action. After preliminary screening, large impurities such as iron filings are removed to obtain black powder. The black powder was soaked in aqua regia for 24 hours and turned brown. At last, it was put into the Muffle furnace and calcined at 400 for 400min. Finally, the silver-gray powder was obtained.

 

Price of niobium carbide

Niobium carbide particle size and purity will affect the product's Price, and the purchase volume can also affect the cost of Niobium carbide. A large amount of large amount will be lower. The Price of niobium carbide is on our company's official website.

 

Niobium carbide supplier

Luoyang Tongrun Nano Technology Co. Ltd.  (TRUNNANO) Luoyang City, Henan Province, China, is a reliable and high-quality global chemical material supplier and manufacturer. It has more than 12 years of experience providing ultra-high quality chemicals and nanotechnology materials, including foam concrete, nitride powder, graphite powder, sulfide powder, and 3D printing powder. If you are looking for high-quality and cost-effective foam concrete, you are welcome to contact us or inquire at any time.

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