Mechanical and Tribological Properties of PVD-Coated Cemented Carbide as Evaluated by a New Multipass Scratch-Testing Method

Table 2

Characteristic properties of the investigated coatings in the as-deposited condition.

	Ti0.86Si0.14N	Ti0.34Al0.66N	(Al0.7Cr0.3)2O3
𝑅𝑎 (nm)	87±7	77±5	174±10
𝑅𝑧 (𝜇m)	5.1±0.5	5.1±0.9	7.2±1
Droplets (no/100 𝜇m^2)	6.3±0.9	4.9±0.7	14.3±2
Area ratio droplets (%)	4.6±0.8	2.7±0.6	18.8±4
Craters (no/100 𝜇m^2)	0.4±0.05	0.4±0.06	0.1±0.02
Area ratio craters (%)	0.7±0.2	0.8±0.2	0.3±0.1
Hardness, composite (GPa)	22±1.5	20±1	19±2
𝐸-modulus composite (GPa)	420±30	500±40	380±36
Hardness, coating (GPa)	38±4	30±3	24±2
𝐸-modulus coating (GPa)	500±70	570±80	440±60
𝐻coat/𝐸coat	0.08	0.05	0.06
Thickness (𝜇m)	2.5	2.5	3.5

*The 𝐻/𝐸 ratio is 0.04 (17.1/426) for the cemented carbide.