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Abstract
This paper presents a study of the tribological properties of stainless steel coatings with varying Ag contents, deposited via magnetron sputtering. The growth of the coatings was done in Ar and Ar + N2 atmospheres in order to change the crystalline phase in the coating. The analysis of the chemical composition was performed using energy-dispersive X-ray spectroscopy (EDS) and the structural analysis was performed via X-ray diffraction (XRD). The adhesive wear resistance and the friction coefficient were evaluated using the ball-on-disk test with a ball of alumina. The coatings’ adhesion was measured with a scratch tester and the mechanical properties were evaluated with a nanoindenter. The morphology of the films and the wear track were characterized via scanning electron microscopy (SEM). By means of XRD, phases corresponding to the body-centred cubic (BCC) structure were found for the coatings deposited in an inert atmosphere and face-centred cubic (FCC) for those deposited in a reactive atmosphere. A more compact morphology was observed in coatings with a higher silver content. The values of the hardness increased with an increase in the silver content and the presence of nitrogen in the coatings. In the wear traces, mainly mechanisms of oxidative and adhesive wear and plastic deformation were found. The coefficient of friction decreased with an increase of silver in the coatings, whereas the wear rate decreased.
Highlights
Stainless steels have good resistance to corrosion, high resistance to cold work and good formability
It has been found that this type of coating has a chemical composition similar to that of austenitic stainless steel targets; a variation in the structure has been found; for instance, a body-centred cubic (BCC) structure is produced for coatings deposited in inert atmospheres (Ar), while for reactive atmospheres (Ar + N2 ), coatings are obtained with a mixture of face-centred cubic (FCC) and BCC
We investigated the effect of silver on the microstructure and the mechanical and tribological properties of stainless steel films with varying silver content that were deposited by means of magnetron sputtering on stainless steel substrates
Summary
Stainless steels have good resistance to corrosion, high resistance to cold work and good formability. It is important to improve the durability of AISI 316L steel by increasing its hardness and wear resistance [8]. The deposition of coatings on steel allows an improvement in its properties such as hardness and resistance to corrosion, wear and fatigue, among others, in comparison with bulk austenitic stainless steels [9,10,11]. Stainless steel-based coatings deposited by means of the sputtering technique have been characterized in different investigations. It has been found that this type of coating has a chemical composition similar to that of austenitic stainless steel targets; a variation in the structure has been found; for instance, a BCC structure is produced for coatings deposited in inert atmospheres (Ar), while for reactive atmospheres (Ar + N2 ), coatings are obtained with a mixture of FCC and BCC
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