Process characteristics and parameters of ANOF as well as that special logarithmic relation of the layer formation parameters which is valid for the spark region are discussed. By calorimetric investigation it can be shown that the greatest share of electric energy will be transformed to heat and that the current quantity of ≈ 1.1.A · s · cm−2 is characteristic for the incubation period before spark discharge during the gas — solid reaction of aluminium coating.
Oxide lityers I)ro(lucetl 1jy ANOF tcwhriiqnc show other structures and properties than such ones anorlizecl as irsrial. Sort>e characteristic mechanical, electrical and chemical pr(iperties are described. Their dependence on structure is discussed.Nltch tlern ANOF-Verfahrcn hergcstellte oxidische Schichten weisen gegeniiber konventionell anotlisch oxidierten Schichten andere Strukturen und Eigenschaften anf. Einige charakteristische niechanische, elektrische und chemische Eigenschaften werden beschrieben und ihre Strukturebhaiigigkeit diskutiert.
Anodic oxidation by spark discharge (ANOF) produces e.g. A1,0, layers containing up t o 25% a-Al,O, on the average if carried out on A1 (KIJRZE et al. (1)) and corresponding oxide layers with special outstanding properties on other barrier layer forming metals esp. Ta, Ti, Zr, Nb(Cb) (KURZE et al. (2), (3), (4); SCHNEIDER ( l ) , (2)). There is a wide field of application possibilities of such layers and composites of them with the bearing metals and other materials, e.g. in the fields of electrical engineering, electronics, medicine and vacuum engineering etc. This is the last one of three general ANOF papers published in this journal (KRYSMANN et a].; DITTRICH et al.). Die anodischc Oxidation unter Funkenentladung (ANOF) erzeugt z. B. Al,O,-Schichten init bis zu 25% Anteil a-Al,O,, wenn die Reaktion auf A1 (KURZE et al. (1)) durchgefuhrt wird und entsprechende Oxide auf anderen sperrschichtbildenden Metallen wie z.
By addition of metal salts to a basic electrolyte as colouring components coloured ANOF layers can be produced. The colour shades of such layers are dependent on concentration and deposition parameters. Two application examples of coloured ANOF layers are demonstrated.
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