Abstract
The aim of this work was to determine the influence of the tungsten addition to TiB2 coatings on their microstructure and brittle cracking resistance. Four coatings of different compositions (0, 7, 15, and 20 at.% of W) were deposited by magnetron sputtering from TiB2 and W targets. The coatings were investigated by the following methods: X-ray diffraction (XRD), transmission electron microscopy (TEM), atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS). All coatings had a homogeneous columnar structure with decreasing column width as the tungsten content increased. XRD and XPS analysis showed the presence of TiB2 and nonstoichiometric TiBx phases with an excess or deficiency of boron depending on composition. The crystalline size decreased from 27 nm to 10 nm with increasing W content. The brittle cracking resistance improved with increasing content of TiBx phase with deficiency of B and decreasing crystalline size.
Highlights
One of the main research and development directions in materials science and engineering is inventing suitable coatings for different device parts in many demanding applications
This study aimed to investigate the effect of tungsten addition on the microstructure and brittle cracking resistance of the TiB2 coatings produced by DC magnetron sputtering
In coatings deposited by Physical Vapour Deposition (PVD) method, the phases with highly overstoichiometric in boron (TiB2+x) or substoichiometric diborides (TiB2-x) were observed in [20]
Summary
One of the main research and development directions in materials science and engineering is inventing suitable coatings for different device parts in many demanding applications. This development is observed in the aviation [1], energy [2], automotive [3,4], and tool industries [5]. Anti-wear coatings are characterized by higher wear resistance and hardness. In many applications, such a high hardness is not advisable due to brittle cracking occurring in this type of coating.
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