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| Structural type | Designation | Temp formed (°C) |
|---|---|---|
| Adsorbed, atomic (surface carbide) | Cα | 200–400 |
| Polymeric, amorphous films or filaments | Cβ | 250–500 |
| Vermicular filaments, fibers, and/or whiskers | Cv | 300–1000 |
| Nickel carbide (bulk) | Cγ | 150–250 |
| Graphitic (crystalline) platelets or films | Cc | 500–550 |
