Molybdenum carbides

Of the different molybdenum-carbon phases only dimolybdenum carbide P-M02C has any industrial importance. It is manufactured by reacting molyb-denum(VI) oxide or metallic molybdenum with carbon black at 1350 to 1800°C in carbon tube short circuit furnaces under hydrogen atmospheres. Due to its low hardness the use of M02C is virtually limited to TiC-Mo2C-Ni cutting materials. 

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CARBmES - INDUSTRIAL HARD CARBIDES] (Vol 4) h-molybdenum carbide [12011-97-1]... 

The four most important carbides for the production of hard metals are tungsten carbide [12070-12-17, WC, titanium carbide [12070-08-5] TiC, tantalum carbide [12070-06-3J, TaC, and niobium carbide [12069-94-2] NbC. The binary and ternary soHd solutions of these carbides such as WC—TiC and WC—TiC—TaC (NbC) are also of great importance. Chromium carbide (3 2) [12012-39-0], molybdenum carbide [12011-97-1], MoC, and... 

Molybdenum carbide is also used in TiC—Ni-based alloys and in titanium carbonitride-based cermets for metal-cutting appHcations. 

K. S. Suslick, M. Fang, T. Hyeon, and A. A. Cichowlas, Sonochemical synthesis and catalytic properties of nanostructured molybdenum carbide, in Molecularily Designed Nanostructered Materials, K. E. Gonsalves., ed., M.R.S., Pittsburgh (1994). 

It has been found that when molybdenum carbide (Mo2C) is used as the soluble anode, a loose carbon crust forms on the surface of the pellets as the dissolution of molybdenum progresses. X-ray diffraction analysis of the spent anode has indicated a predominance of the Mo2C phase. This suggests that the anodic reaction proceeds as... 

Hyeon T, Fang M, Suslick KS (1996) Nanostructured molybdenum carbide sonochemical synthesis and catalytic properties. J Am Chem Soc 118(23) 5492-5493... 

Jin C, Haufler RE, Hettich RL, Bashick CM, Compton RN, Puretzky AA, Dem yanenko AV, Tuinman AA (1994) Synthesis and characterization of molybdenum carbide clusters MonC4n (n = 1 to 4). Science 263 68-71... 

On a y-alumina powder in a fluidized bed at 493 K it has been shown by XPS that [Mo(CO)6] decomposes mainly to molybdenum carbide [13]. In the early stages... 

However, when heated with carbon monoxide at temperatures above 1,000°C, no carbonyl is obtained but a thin film of molybdenum carbide forms over the metal. 

Methane dehydroaromatization on zeolites Mo/HZSM-5 was also investigated by solid-state MAS NMR spectroscopy 162. Both variation of the state of the transition metal component and products (such as ethane, benzene, and ethylene) adsorbed in zeolite were observed after reaction at high temperature (900-1000 K). Molybdenum carbide species, dispersed on the external surface or in the internal channels of the zeolite catalysts, had formed during the reaction 162. ... 

The first carbonitride alloys based on Ti(C,N)—Ni—Mo were introduced in 1970 followed by (Ti, Mo)(C,N)-based compositions having fine microstructures that provided a balance of wear resistance and toughness (4). Continued research on the titanium carbonitride alloys, often called TiC—TiN cermets, in the 1980s led to the development of complex cermets having a variety of additives such as molybdenum carbide(2 1) [12069-89-5], Mo2C, TaC, NbC, zirconium carbide [12020-14-3], ZrC, hafnium carbide [12069-85-1], HfC, WC, vanadium carbide [12070-10-9], VC, chromium carbide (3 2)... 

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