Molybdenum diboride

MnB2 MANGANESE DIBORIDE 1036 MoS3 MOLYBDENUM TRISULFIDE 1075... 

Titanium Mononitride (TiN) Molybdenum Disilidde (MoSi2) Titanium Diboride (TiB2) Aluminum Oxide (AI2O3) 0.057 at 127 °C 0.057 at 650°C 0.058-0.062 at room temp. 0.06 at room temp. 

B4C), nitrides such as silicon nitride (Si3N4) and boron nitride (BN), borides such titanium diboride (TiB2), silicides such as molybdenum disilicide (MoSi2) and halides such as lithium fluoride (LiF). There are also compounds based on nitride-oxide or oxynitride systems (e.g., p -sialons with the general formula Sie-jAl Ng-jOj., whCTe 0 < z < 4). 

The microhardness of coatings was 18-19 GPa for molybdenum carbide [6], 29-31 GPa for tungsten carbide, and 31-32 GPa for zirconium diboride. The presence of a diffusion zone that ensured the adhesion of coatings to the substrate, was confirmed by qualitative and semiquantitative X-ray spectral microanalyses of microsections which were performed with a MS-46 Cameca electronic probe. The continuity of the coating-substrate transition was confirmed by stereoscopic images of the cross-sections of the electroplated samples. 

The resistance to wear and abrasion was tested on steel 45 samples with different coatings. The second body was made of quenched steel 45. The wear resistance of samples increased by a factor of 5-7 for molybdenum carbide coatings [5], 6-9 for tungsten carbide coatings, and 8-11 for zirconium diboride coatings. 

Lu H, Jia W, Ma R. Titanium diboride and molybdenum silicide composite coating on cathode carbon blocks in aluminium electrolysis cells by atmospheric plasma spraying. Light Met. 2005 134 785-8. 

Furthermore, formation of a solid solution between ZrB and Mo up to 10 mol% was also reported by Kislyi and co-authors (Kislyi, 1965), who noticed the incorporation of 10 mol% molybdenum in zirconium diboride at 1600-1700°C. 

The development of (Zr,Mo)B2 solid solution, confirms a discrete solubility of Mo in ZrB. On the other hand, the detection of Mo traces in HfB and TaB grains suggests that molybdenum is also partially soluble in the hafnium and tantalum diboride matrix phase, although to a lower extent. 

Kislui, P S., Kuzenkova, M. A. (1966). Regularities of sintering of zirconium diboride-molybdenum alloys. Soviet Powder Metallurgy and Metal Ceramics, 5, 360-365. doi 10.1007/BF00775989. 

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