The present invention relates to novel tungsten carbide powder which a specific BET-surface, crystallite number and size, to a method for the production and use thereof.

The present invention relates to novel tungsten carbide powder which a specific BET-surface, crystallite number and size, to a method for the production and use thereof.

A powder containing tungsten carbide has an Fsss particle size of greater than or equal to 0.3 μm and less than or equal to 1.5 μm, and a content rate of the tungsten carbide of greater than or equal to 90% by mass. The powder has a crystallite size (average particle diameter) Y satisfying a relational expression of Y≤0.1×X+0.20 (X: the Fsss particle size of the power containing tungsten carbide).

A powder containing tungsten carbide has an Fsss particle size of greater than or equal to 0.3 μm and less than or equal to 1.5 μm, and a content rate of the tungsten carbide of greater than or equal to 90% by mass. The powder has a crystallite size (average particle diameter) Y satisfying a relational expression of Y≤0.1×X+0.20 (X: the Fsss particle size of the power containing tungsten carbide).

A tungsten carbide powder contains tungsten carbide as a main component and chromium, in which, when mass concentrations of tungsten and chromium are measured at 100 or more analysis points randomly selected from a field of view of SEM observation of the tungsten carbide powder, a standard deviation σ of distribution of the ratio by percentage of the concentration of chromium to the total concentration of tungsten and chromium is 0.5 or less.

A tungsten carbide powder contains tungsten carbide as a main component and chromium, in which, when mass concentrations of tungsten and chromium are measured at 100 or more analysis points randomly selected from a field of view of SEM observation of the tungsten carbide powder, a standard deviation σ of distribution of the ratio by percentage of the concentration of chromium to the total concentration of tungsten and chromium is 0.5 or less.

A method for CO.sub.2 hydrogenation via the reverse water-gas shift (RWGS) reaction using alkali metal-doped molybdenum carbide, supported on gamma alumina (A-Mo.sub.2C/γ-Al.sub.2O.sub.3, A=K, Na, Li). The A-Mo.sub.2C/γ-Al.sub.2O.sub.3 catalyst is synthesized by co-impregnation of molybdemun and alkali metal precursors onto a γ-Al.sub.2O.sub.3 support. It is then carburized to form the A-Mo.sub.2C/γ-Al.sub.2O.sub.3. Also disclosed is the related catalyst material.

A method for CO.sub.2 hydrogenation via the reverse water-gas shift (RWGS) reaction using alkali metal-doped molybdenum carbide, supported on gamma alumina (A-Mo.sub.2C/γ-Al.sub.2O.sub.3, A=K, Na, Li). The A-Mo.sub.2C/γ-Al.sub.2O.sub.3 catalyst is synthesized by co-impregnation of molybdemun and alkali metal precursors onto a γ-Al.sub.2O.sub.3 support. It is then carburized to form the A-Mo.sub.2C/γ-Al.sub.2O.sub.3. Also disclosed is the related catalyst material.

The present disclosure relates to a method for producing a metal carbide, where the method includes thermally treating a molecular precursor in an oxygen-free environment, such that the treating produces the metal carbide and the molecular precursor includes

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where M is the metal of the metal carbide, N* includes nitrogen or a nitrogen-containing functional group, and x is between zero and six, inclusively.

Powder metallurgy, in particular production of tungsten monocarbide spherical powders, which is a major component of metalloceramic hard alloys used for manufacture of tools, drill bits, steel alloying, wear-resistant coating cladding at elements operating in intensive wear conditions. The method includes melting of the starting material, and melt atomization with forming of spherical powder. As starting material a tungsten monocarbide grit is used. Melting and atomization of the material is implemented by continuous filling of grit into a rotating crucible of a centrifugal atomization device under an inert atmosphere and melting it by a plasma arc. After that an annealing of the obtained powder is made at a temperature of 1200-1400° C. during a time necessary for W.sub.2C breakup with subsequent cooling of the powder in a furnace. And, the production of tungsten monocarbide spherical powder with WC content of more than 70%.