Due to the continuous evolution of the industry, there has been an increasing demand for cutting tools
that have properties such as significant hardness, resistance to corrosion, and wear. This has motivated
the research, development and implementation of coatings that present a combination of good
mechanical and tribological properties, which increase the performance of these tools.
For this reason, throughout this work, the effect that monolayer (CrAlSiN) and multilayer (CrAlN)
coatings have on micromechanical properties has been analyzed and compared. In addition, the effect
of working with different bilayer thicknesses, and the effect of different types of substrates (Inconel,
1.2344 steel and WC-Co) have been analyzed.
Scratch adhesion, monotonic spherical indentation, and microhardness tests were performed. The
damages obtained after performing each test were evaluated through light microscopy, confocal
microscopy and SEM.
It was verified that when using multilayer coatings, an improvement in the micromechanical properties
is obtained. And in turn, these properties improve with their bilayer thickness. In this way, an increase
in hardness was obtained that was from 19% to 76% compared to the monolayer coating. In turn, an
improvement in adhesion was obtained, as well as the contact pressure necessary for the appearance
of plastic deformation.
On the other hand, it was demotivated that among the three substrates analyzed, WC-Co is the one
that presents a better combination of the analyzed properties. In this way, by having a monolayer
coating on said substrate, even higher results are obtained, than when multilayer coatings are used on
the steel.
Lately, thanks to the tribological and mechanical properties of diamond coatings such as carbon (DLC),
their use in industry has increased. That is why, the knowledge of the factors that control their
properties and, therefore, the final performance of the coated components in practical tribological
applications, becomes increasingly important.
In this work, from the DLC samples analyzed, using the Ramana spectroscopy technique, two different
structures were identified. Thus, one is known as amorphous carbon and the other is known as
amorphous tetrahedral carbon. The latter is expected to present a better combination of mechanical
properties.
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