Structural and chemical composition analysis of WCN produced by pulsed vacuum arc discharge

The structural and chemical compositions of tungsten carbonitride WCN coatings deposited with a pulsed vacuum arc technique at two substrate temperatures are presented here. Several characterization methods, such as X-ray diffraction, Fourier Transform infrared spectroscopy with photoelectron spectr...

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Bibliographic Details
Published in:Surface & coatings technology 2013-10, Vol.232, p.96-100
Main Authors: Ospina, R., Escobar-Rincón, D., Arango, P.J., Restrepo-Parra, E., Jurado, J.F.
Format: Article
Language:English
Subjects:
Carbon
Carbonitrides
Chemical composition
Coatings
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Fourier transforms
FTIR
Infrared spectroscopy
Materials science
Nanocomposite
Physics
Surface treatments
TEM
Tungsten
Tungsten carbide
XPS
XRD
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Summary:The structural and chemical compositions of tungsten carbonitride WCN coatings deposited with a pulsed vacuum arc technique at two substrate temperatures are presented here. Several characterization methods, such as X-ray diffraction, Fourier Transform infrared spectroscopy with photoelectron spectroscopy and transmission electron spectroscopy were used. These characterization methods showed that the coatings consisted of a nano-crystalline matrix that contained several phases of tungsten carbonitride (α-WCN) and tungsten carbide (W2C) and an oxidized phase of tungsten carbide (W2(C,O)). Moreover, The XPS W4f, C1s and N1s peaks and the valence band spectrum indicated the presence of nitrogen, carbon, carbon combined with nitrogen (which is fully bonded to tungsten as nitride), carbide and carbonitride, respectively. FTIR spectra showed the existence of NCN, CC, CC, CN and CN bonds. In this energy range, two regions related to D and G bands that correspond to carbon bonds were identified. The nanoindentation technique was used to evaluate hardness. The coatings exhibited a low hardness (lower than 15GPa), which was potentially caused by the presence of the oxide. •WCN coatings were successfully synthesized by pulsed vacuum arc methods.•XRD and XPS confirmed the presence of several phases of W2(C,O), W2C and WCN.•TEM showed the presence of a mixture of amorphous and crystalline phases.•The oxidation and the presence of an amorphous phase produce a decrease in the coatings' hardness.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2013.04.058