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Carbide Gear Hob Standard Module
| Table of carbide hob coating types | |||||||
| No | coating material | hardness(HV) | Coefficient of friction for steel (dryness) | Internal stress(Gpa) | Maximum applicable temperature (Celsius) | The color of the coating | coating structure |
| 1 | TIN | 2300 | 0.4 | -2.5 | 600 | golden | monolayer |
| 2 | AlCrN | 3200 | 0.35 | -3 | 1100 | blue grey | monolayer |
| 3 | TiCN | 3000 | 0.4 | -4 | 400 | blue grey | multilayer |
| 4 | WC/C | 1000/2000 | 0.10-0.20 | -1 | 300 | Black gray | laminal |
| 5 | CrN | 1750 | 0.5 | 0.75 | 700 | silver gray | monolayer |
| 6 | polycrystalline diamond | 8000-10000 | 0.15-0.20 | 600 | LightGray | monolayer | |
| 7 | iAlN | 3300 | 0.30-0.35 | 0.866666667 | 900 | Purple-grey | Nano-structure |
| 8 | TiCN+TiN | 3000 | 0.4 | -4 | 400 | golden | Multi-layered, sloping |
| 9 | TiAlN+ WC/C | 3000 | 0.15-0.20 | 0.85 | 800 | LightGray | multilayer,laminal |
| 10 | DLC(a-C:H) | 2500 | 0.10-0.20 | 350 | Black gray | monolayer | |
| 11 | TiAlN | 3300 | 0.25 | -0.866666667 | 900 | Purple-grey | Nano-structure |
| 12 | TiAlN | 3300 | 0.4 | 0.857142857 | 900 | blue grey | Nano-structure |
| 13 | TiAlN | 3500 | 0.4 | -4 | 800 | Purple-grey | monolayer |