Resistance Properties of Al-Si Coatings
B. Kucharska and J. Kowalczyk
Institute of Materials Engineering, Faculty of Production Engineering and Materials Technology, Technical University of Częstochowa, Częstochowa, Poland
Full Text PDF
Modern methods for modification of properties and protection of material surface, which embrace gaseous phase physical deposition methods, arouse interest of many branches of industry as well as medicine. By virtue of their fine-grained structure, metallic coatings fabricated by these methods have superior mechanical properties and corrosion resistance when compared with alloys made by traditional techniques. The paper presents a study of the electrical properties and structure of Al-Si coatings. The coatings were deposited by physical vapor deposition. Targets of hypo-, peri- and hypereutectic composition alloys were sputtered using the magnetron process. The coatings were the resistance element in the dc current circuit and measurements were carried out by the four-point method. Based on current-voltage parameters, the coatings electrical resistance was determined at specified temperatures. It was found that an increase of Si content in the chemical composition of the coatings resulted in an increase of their resistance and the maximum temperature to which the coating heats up. By means of a X-ray diffraction the occurrence of thin film of aluminum and silicon oxides on the coatings surface were detected. The oxide film increases resistance of the coatings and hamper measurements at low voltage.

DOI: 10.12693/APhysPolA.129.197
PACS numbers: 73.61.At, 81.07.Bc, 81.15.Cd