Full text: Fortschritte in der Metallographie

Defect Evaluation in PVD Coated Steels by Copper Decoration Technique 
M. Urgen’, A.F. Cakir’, O.L. Eryllmaz’, C. Mitterer" 
Technical University of Istanbul, Department of Metallurgical Engineering, 
80626, Ayazaga, Istanbul (Turkey) 
"Institut fiir Metallkunde und Werkstoffpriifung, Montanuniversitdt, 
Franz-Josef-Straße 18, A-8700 Leoben (Austria) 
Abstract 
In this work the copper decoration technique was applied to evaluate the different kinds and the 
J frequency of defects in coated steels. Different coatings, i.e. TiN deposited by the arc PVD technique and 
1000 Zr-B as well as Zr-B-N deposited by the dc magnetron sputtering process, were used. The application 
potential of the decoration technique for the evaluation of crucial defects for the corrosion behaviour of 
the coating/substrate system is shown. 
Anwendung der Kupfer-Dekorationstechnik zur Defektbestimmung bei PV D-beschichteten Stiihlen 
Kurzfassung 
In dieser Arbeit wird die Kupfer-Dekorationstechnik zur Bewertung der Fehler in Hartstoffschichten, die 
mit Hilfe von PVD-Verfahren auf Stahlsubstrate abgeschieden wurden, herangezogen. Dazu wurden 
einerseits mit Hilfe des Arc-PVD-Prozesses abgeschiedene TiN-Schichten und andererseits durch 
Magnetronkathodenzerstiuben aufgebrachte Zr-B- und Zr-B-N-Schichten verwendet. Das 
Anwendungspotential der Methode zur Bestimmung der Art und Hiufigkeit kritischer, d.h. bis zum 
Grundmaterial reichender Schichtfehler, die das Korrosionsverhalten derartiger Schicht/Substrat-Verbunde 
bestimmen, wird aufgezeigt. 
1, Introduction 
|! 
FH Hard, wear-resistant coatings which are deposited by Physical Vapour Deposition (PVD) techniques are 
1000 generally applied to provide a surface having other beneficial properties such as wear resistance, 
corrosion protection, optical and electrical properties and decorative appearance. These coatings are 
mainly based on the nitrides and carbides of the transition metal elements. In addition, recently increasing 
interest is laid on the corresponding borides [1-3]. 
Prakt. Met. Sonderbd. 26 (1995) 443
	        
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