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Transition Metal Carbides Material Data
Parameter |
Units
|
HfC |
ZrC |
NbC |
TaC |
TiC |
VC |
| Molecular Weight | g/mol |
190.51 |
103.23 |
104.92 |
192.96 |
59.91 |
|
| Stoichiometry | N/A |
~1 |
~1 |
~1 |
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| Metal Impurities | ppm by wt. |
<30 |
<30 |
<30 |
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| Lattice Parameter | Angstroms |
4.640 |
4.700 |
4.468 |
4.454 |
4.328 |
4.16 |
| Melting Temperature | K |
~4160 |
~3300 |
~3770 |
~4150 |
~3430 |
|
| Density | g/cm3 |
12.20 |
6.59 |
7.79 |
14.50 |
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| Hardness | Kg/mm2 |
-- |
2600 |
2470 |
1800 |
3200 |
-- |
| Coefficient of Thermal Expansion @ 300-3000 K | α x 10-6 |
7.3 ± 0.2 |
7.6 ± 0.2 |
9.5 ± 0.3 |
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| Thermal Conductivity | cal-cm/(s-cm2-C) |
-- |
0.049 |
0.034 |
0.053 |
0.049 |
|
| Electrical Resistivity | µΩ-cm |
109 |
~70 |
74 |
170-200 |
180-250 |
|
| Effective Work Function (100) at 1800 K | eV |
3.58 |
3.53 |
4.0 |
4.2 |
3.8 |
|
| Absolute Work Function (100) at 300 K (UHV) | eV |
3.50 |
4.12 |
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| Spectral Emissivity (@ 0.65 microns & 2000 K) | N/A |
0.645 |
0.480 |
0.359 |
0.365 |
0.487 |
0.433 |
| Evaporation rate at 1800 K (UHV) | g/cm2/s |
< 10-9 |
< 10-9 |
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| Orientation limit for specific orientation | degrees |
<2 |
<2 |
<2 |
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