Table 1325. Coating materials for cutting tools.
Best materials (in order) |
Properties |
Al2O3, TiN, TiC
|
Oxidation and corrosion resistance; high-temperature stability |
Al2O3, TiN, TiC |
Crater-wear resistance |
TiC, TiN, Al2O3 |
Hardness and edge retention |
Al2O3, TiC, TiN |
Abrasion resistance and flank wear |
TiN, Al2O3, TiC |
Low coefficient of friction and high lubricity |
TiN, TiC, Al2O3 |
Fine grain size |
Al2O3 |
Good wear and oxidation resistance; good thermal barrier |
TiAlN |
Improved hot hdardness and chemical resistance relative to TiN |
TiB2 |
Resists built-up edge in aluminum machining |
TiC |
Wear resistance |
TiCN |
Harder than TiN; improved wear resistance and adhesion to carbide substrate |
TiN |
Primarily used to indicate tool wear when its gold color is worn off |
ZrO2 |
Good thermal and chemical resistance properties |
|