Influence of W Addition on Microstructure and Resistance to Brittle Cracking of TiB2 Coatings Deposited by DCMS

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 wer...

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Bibliographic Details
Published in:Materials 2021-08, Vol.14 (16), p.4664
Main Authors: Chudzik-Poliszak, Edyta, Cieniek, Łukasz, Moskalewicz, Tomasz, Kowalski, Kazimierz, Kopia, Agnieszka, Smolik, Jerzy
Format: Article
Language:English
Subjects:
Atomic force microscopy
Brittleness
Coatings
Columnar structure
Composition
Crystal structure
Crystallinity
Cutting tools
Magnetron sputtering
Microscopy
Microstructure
Photoelectrons
Titanium diboride
Tungsten
X ray photoelectron spectroscopy
X-ray diffraction
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Summary: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.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma14164664