Molybdenum boride

Borides of Group Via. As with the borides of Group Va, the incorporation of free metal in the Group Via borides is difficult to avoid. Both tungsten and molybdenum borides are obtained at high temperature by the hydrogen reduction of the mixed bromides.Bonding appears a more effective method to form these borides in thin layers (see Sec. 2.2 above). 

Molybdenum boride (Mo B) is used to braze (weld) special metals and for noncorrosive electrical connectors and switches. It is also used to manufacture high-speed cutting tools and noncorrosive, abrasion-resistant parts for machinery. 

Fig. 4.9. Formation of a molybdenum boride layer between Mo and B-containing phase (a) and between Mo and MoB (b)289 Annealing temperature 1450°C. Time (a), 9000 s (2.5 h) (b), 7200 s (2 h). Photographs kindly provided by Prof. W. Lengauer. Reprinted with permission from Elsevier Science.

Similar to the examples of group 5 element borides, the chemical vapor deposition of molybdenum boride and tungsten boride is difficult to achieve. Both compositions can be deposited by hydrogen co-reduction of a mixture of the metal bromides and boron... 

Chromium boride Hafnium boride Molybdenum boride... 

Gidikova, N., Kovacheva, R., 1996. Titanium- and molybdenum-boride composite coatings on steel. Prakt. Metallogr. 33, 154. 

Scanlon, M.D., Bian, X., Vrubel, H. etal. (2013) Low-cost industrially available molybdenum boride and carbide as platinum-like catalysts for the hydrogen evolution reaction in biphasic liquid systems. Physical Chemistry Chemical Physics, 15 (8), 2847-2857. 

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