Gear Hob, Carbide
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 |
The coated tool is to coat a thin layer of refractory metal or
non-metallic compound with good wear resistance on the surface of
cemented carbide or high-speed steel (HSS) substrate with good
strength and toughness (can also be coated on superhard material
inserts such as ceramic, diamond and cubic boron nitride). The
coating acts as a chemical and thermal barrier, reducing diffusion
and chemical reactions between the tool and the workpiece, thereby
reducing wear on the substrate. The coated tool has the
characteristics of high surface hardness, good wear resistance,
stable chemical properties, heat and oxidation resistance, low
friction coefficient and low thermal conductivity. The speed is
20%~70%, the machining accuracy is improved by 0.5~1 level, and the
tool consumption cost is reduced by 20%~50%.