Abstract
Summary A comparison of arc coatings produced by the steered arc and random arc techniques is given. By application of a movable permanent magnet, the arc spot can be steered and forced to follow a predetermined path. This results in smaller craters and a clear reduction of molten cathode areas. Consequently, the steered arc technique can prevent larger droplets, such as those typical of the random arc technique. With regard to coating properties such as hardness, critical load and structure, no essential differences are indicated for both techniques. Both arc variants are suitable for successful application in wear protection. The selection of the appropriate system depends on the technical requirements. Finally, the new steered arc technique gives the advantage of using segmented cathodes. Multicomponent coatings of various composition from the same target and multilayers, which can both be produced by the steered arc technique with segmented cathodes, signify an enormous industrial potential.
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