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Carbide character table

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  WC Mo2C TiC TaC NbC VC ZrC
Carbon content[%]
(theoretical value)		 6.13 5.89 20.05 6.22 11.45 19.08 11.64
Crystal structure Hexagonal Hexagonal Face centerd
cubic		 Face centerd
cubic		 Face centerd
cubic		 Cubic Cubic
Lattice periods,kx. a 2.906 2.997 4.3178 4.410 4.433 4.118 4.6828
c 2.837 4.727          
c/a 0.975 1.54          
Density[g/cm3]
calculated		 15.77 9.06 4.92 14.47 7.82 5.48 6.66
experimental 15.5-15.7 9.18 4.93 14.32 7.56 5.36 6.73
Microhardness 100g
[kg/mm2]		 1730 1479 2850-3200 (50g) 1547 2055 2480 2950(50g)
Melting Point[℃] 2600 2690±20 3250 3880±150 3500±125 2648 3530
Heat of formation
from the metal and
carbon ΔH°(298）
[Kcal/mol]		 -8.4±3.0 -4.2 -43.85 -36.00 -33.6±0.8 -24.4±0.4 -47.7±5.0
Entropy S°(298)
[Kcal/mol・℃]		 9.0±1.5 19.8±3.0 5.8±0.1 9.0±7.0 19.0±8.0 6.77±0.1 8.5±1.5
Specific electrical
resistance[μΩcm]
at 20℃		 19 71 61 22 44 78(25℃） 49(25℃）
Point of transition to
superconductivity °K		 2.5-4.2 2.9 11.15 7.6-9.5 10.1-10.5 < 1.2 < 1.2

(Reference) Hand book refractory compounds (metallurgiya in Moscow 1976 editions)

 

Metallic carbide powders are representative hard materials that have been in conventional use for some time.
As a main ingredient in cemented carbide WC has been used in cutting tools and wearresistant applications. Improvement of its characteristics is further expanding the applications and demand for this material.
In addition,TiC,TaC(generally as a solid solution, such as WC-TiC and WC-TiC-TaC), VC, and Cr3C2 are used as important secondary ingredients in cemented carbide.

As the main ingredient in cermet cutting tools, TiC is an important material and TiN, NbC, VC, WC, and Mo2C are also added.
TiC and TiN are also used in titanium carbonitride solid solution powders.
TiC is also used in ceramic materials, such as Al2O3, and as an electrically conductive additive.

TaC and NbC are used for decorations, such as mirror-type case, WC and NbC are used as hardfacing materials, and ZrC possesses infrared radiating characteristics(especially sunlight) and together with Zr and Ti compound powders have been developed for use in thermal insulating and heating products.

 

 

 

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