Molybdenum carbide

General
Surname	Molybdenum carbide
other names	Dimolybdenum carbide
Molecular formula	Mo 2 C
Brief description	gray-black solid
External identifiers / databases
EC number	235-115-7
ECHA InfoCard	100,031,911
PubChem	159430
Wikidata	Q4214559
properties
Molar mass	203.91 g mol −1
Physical state	firmly
density	8.9 g cm −3
Melting point	2687 ° C
solubility	practically insoluble in water
safety instructions
GHS labeling of hazardous substances	no GHS pictograms
	no GHS pictograms
H and P phrases	H: no H-phrases
	P: no P-phrases
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Molybdenum carbide (more precisely dimolybdenum carbide ) is an intermetallic compound of molybdenum from the group of carbides . In addition to dimolybdenum carbide, other phases such as monomolybdenum carbide (MoC) are known in the molybdenum- carbon system.

Extraction and presentation

Molybdenum carbide can be obtained by reacting ammonium molybdate with hydrogen and carbon monoxide at a temperature between 550 ° C and 600 ° C. It is also possible to display it by reacting molybdenum (VI) oxide with soot at 1350 to 1800 ° C in a carbon tube short-circuit furnace under a hydrogen atmosphere.

properties

Molybdenum carbide is a flammable gray-black odorless solid that is practically insoluble in water. The compound occurs in various crystalline forms, the most common of which are the α and β modifications. The latter phase is stable at low temperatures and occurs in steels. It has a tightly packed hexagonal crystal structure with the carbon atoms in one half of the available octahedral holes.

use

Molybdenum carbide is used as hard metal cutting material, its use due to the low hardness mainly on TiC -Mo ₂ C Ni - cutting materials is limited.

Individual evidence

^ ^A ^b Hugh O. Pierson: Handbook of Refractory Carbides & Nitrides: Properties, Characteristics ... William Andrew, 1996, p. 111 ( limited preview in Google Book search).
↑ David R. Lide (Ed.): CRC Handbook of Chemistry and Physics . 90th edition. (Internet version: 2010), CRC Press / Taylor and Francis, Boca Raton, FL, Properties of the Elements and Inorganic Compounds, pp. 4-76.
↑ ^a ^b ^c ^d ^e ^f Entry on molybdenum carbide in the GESTIS substance database of the IFA , accessed on September 9, 2014(JavaScript required) .
↑ Patent DE0001310300 : Process for the production of molybdenum carbide. Published January 26, 2006 , Inventors: Khan, Mohamed H .; Dove, Joel A.
↑ ^a ^b Martin Bertau, Armin Müller, Peter Fröhlich, Michael Katzberg, Karl Heinz Büchel, Hans-Heinrich Moretto, Dietmar Werner: Industrial Inorganic Chemistry . John Wiley & Sons, 2013, ISBN 978-3-527-64959-4 , pp. 614 ( limited preview in Google Book search).
↑ molybdenum.com.cn: Molybdenum carbide in tempered martensite

[Hugh_O._Pierson-1] A ^b Hugh O. Pierson: Handbook of Refractory Carbides & Nitrides: Properties, Characteristics ... William Andrew, 1996, p. 111 ( limited preview in Google Book search).

[2] David R. Lide (Ed.): CRC Handbook of Chemistry and Physics . 90th edition. (Internet version: 2010), CRC Press / Taylor and Francis, Boca Raton, FL, Properties of the Elements and Inorganic Compounds, pp. 4-76.

[GESTIS-3] ↑ ^a ^b ^c ^d ^e ^f Entry on molybdenum carbide in the GESTIS substance database of the IFA , accessed on September 9, 2014(JavaScript required) .

[4] Patent DE0001310300 : Process for the production of molybdenum carbide. Published January 26, 2006 , Inventors: Khan, Mohamed H .; Dove, Joel A.

[Martin_Bertau,_Armin_Müller,_Peter_Fröhlich,_Michael_Katzberg,_Karl_Heinz_Büchel,_Hans-Heinrich_Moretto,_Dietmar_Werner-5] Martin Bertau, Armin Müller, Peter Fröhlich, Michael Katzberg, Karl Heinz Büchel, Hans-Heinrich Moretto, Dietmar Werner: Industrial Inorganic Chemistry . John Wiley & Sons, 2013, ISBN 978-3-527-64959-4 , pp. 614 ( limited preview in Google Book search).

[6] ybdenum.com.cn: Molybdenum carbide in tempered martensite