Non gamma-phase cubic AlCrO
View Patent ↗The present invention relates to a coating for workpieces with at least one layer, the at least one layer comprising metal components represented by AlxCr1−x wherein x is an atomic ratio meeting 0≦x≦0.84 and comprising non metallic components represented by O1−yZy where Z is at least one Element selected from the group N, B, C and 0≦y≦0.65, preferably y≦0.5 characterized in that the coating comprises at least partially a cubic non gamma Cr and oxide comprising phase in such a way that the x-ray diffraction pattern shows formation of cubic phase which is not the cubic phase of CrN.
1. A method for coating bodies, the method comprising the steps of:
providing a body or bodies to be coated;
introducing the body or bodies into an arc discharge ion-plating coating system with a target of the composition Al a Cr 1-a where 0≦a≦0.85; and
performing the arc discharge ion plating in such a way that at least one process step comprises an oxygen flow between 50 sccm and 400 sccm and a nitrogen flow in such a way that a pressure is regulated to 3.5 Pa.
2. The method according to claim 1 characterized in that no argon is added as process gas.
3. The method according to claim 1 characterized in that the oxygen flow is between 100 sccm and 400 sccm.
4. The method according to claim 3 characterized in that the oxygen flow is between 150 sccm and 200 sccm.