Abstract: In order to improve a method for decoating of ceramic hard material layers from steel and cemented carbide substrates having a ceramic hard material layer on part of the surface thereof and to make it amenable to further applications, it is proposed that the workpieces (10) to be decoated be inserted—preferably with a part thereof without a ceramic hard material layer—into guard elements, preferably protective plugs, which fit in diameter and height, and be pressed into a holder (50), the holder with the workpieces (10) to be decoated be contacted with the plus pole of the current pulse driver, an either acidic or basic electrolytic bath be selected, the contacted holder be placed into the selected electrolytic bath (30), at least one electrode (20) be positioned at a predetermined distance from the holder and the latter be contacted with the negative pole of the power pulse generator (40), the decoating is performed by means of the current pulse driver, with endpoint detection being performed continuously or

Abstract: In order to improve a method for decoating of ceramic hard material layers from steel and cemented carbide substrates having a ceramic hard material layer on part of the surface thereof and to make it amenable to further applications, it is proposed that the workpieces (10) to be decoated be inserted—preferably with a part thereof without a ceramic hard material layer—into guard elements, preferably protective plugs, which fit in diameter and height, and be pressed into a holder (50), the holder with the workpieces (10) to be decoated be contacted with the plus pole of the current pulse driver, an either acidic or basic electrolytic bath be selected, the contacted holder be placed into the selected electrolytic bath (30), at least one electrode (20) be positioned at a predetermined distance from the holder and the latter be contacted with the negative pole of the power pulse generator (40), the decoating is performed by means of the current pulse driver, with endpoint detection being performed continuously or

Abstract: An antireflection coating having a high abrasion and scratching resistance can be applied to natural glass by sputtering, the substrates being positioned closer to the target than usual in order to obtain an increased density of the applied layers. An irregular deposition rate can be compensated by moving the substrate, thus allowing to ensure a regular thickness and therefore a high optical quality of the antireflection coating in these conditions as well. On the preferred sapphire watch glass, SiO2 and Si3N4 resp. AlN and Al2O3 can be used for the individual layers, in particular. These layers do not have a noticeable color effect, but on account of their high hardness, their abrasion and scratching resistance is comparable to that of sapphire glass.