AlTiSiN
Elements: Al, Ti, Si, N
Aluminum → forms a dense Al₂O₃ protective layer at high temperatures, enhancing oxidation resistance.
Silicon → refines the grain structure, improving hardness and wear resistance.
TiSiN
Elements: Ti, Si, N
No aluminum → lacks the protective Al₂O₃ film at high temperature.
Relies on TiN’s wear resistance + Si grain refinement for hardness and heat resistance.
AlTiSiN: 3500–3800 HV
TiSiN: 3200–3400 HV
AlTiSiN is slightly harder.
AlTiSiN
Oxidation temperature: 1100–1200℃
Suitable for dry cutting and high-speed machining.
TiSiN
Oxidation temperature: 800–900℃
Weaker at high temperature compared with AlTiSiN.
Both are lower than traditional TiN.
AlTiSiN → better for high-speed, high-temperature operations.
TiSiN → good for medium temperature and high-hardness steels.
AlTiSiN-coated tools
High-speed milling, dry cutting, stainless steel, nickel-based alloys, titanium alloys, other difficult-to-machine materials.
Molds: hot-work molds, stamping dies.
TiSiN-coated tools
General steel machining (HRC ≤ 55).
Drill bits, end mills, taps, and general-purpose cutting tools.
Good balance of hardness and cost for standard applications.
| Coating | Hardness (HV) | Oxidation Temp | Key Features | Typical Applications |
|---|---|---|---|---|
| AlTiSiN | 3500–3800 | 1100–1200℃ | High hardness, oxidation resistance, heat stability | High-speed cutting, difficult materials |
| TiSiN | 3200–3400 | 800–900℃ | High hardness, cost-effective, good wear resistance | General steel cutting, standard tools |
AlTiSiN = with Al → better at high temperature → best for high-speed & difficult materials
TiSiN = without Al → weaker at high temp → good for standard machining
