Wear resistance and hardness
The great wear resistance is due to the hardness and morphology of the aluminum oxide, which is
alloy-dependent. The hardness layer depends on the composition and structure of the base material
and it varies between 400 and 500 HV 0.025.
The heat conductivity amounts to about 1/10 to 1/30 of the heat conductivity of the base material.
The layers can resist for short spans of time to temperature peaks of up to 2,200°K.
The electrical resistivity amounts to 4．10 to the power of 15 Ωcm at 20°C, 0.8×1015 Ω cm at 100°C
and 0.11×1015 Ω cm at 200°C.
The electric strength is alloy-dependent and it increases with the layer's thickness but not
proportionally. The arithmetical mean value of 10 single measurements according to ISO 2376 amounts
to 914 V with 30 µm of HC on AlMgSi1 and 1213 V with 50 µm of HC on AlMgSi1.
The colors range is depended by alloy and thickness. From grey-brown to black, greenish grey to dark
grey or golden yellow to greyish yellow.
All technical values published here are subject to the test conditions specified. We therefore
empasise that the applications and operating conditions, along with the end user’s practical
experience, will ultimately determine the level of performance achieved by the coating and/or