Preparation and Characterization of Sulfurized Tungsten Doped Non-hydrogenated Diamond-Like Carbon Films

Comportamento tribológico dependente da temperatura e mecânico de revestimentos CrN/DLC e multicamada DLC-W para aplicações em motores de automóveis.

“…The fact that a surface with relatively high hardness will usually have low wear resistance was confirmed by these results (CAPOTE et al, 2015; LUKASZKOWICZ; PARADECKA; WIŚNIEWSKA, 2013). (TAKENO et al, 2008;, direct-current plasma enhanced chemical vapor deposition (DC-PECVD) (BAI et al, 2021) and ion beam assisted deposition (IBAD) (LIU et al, 2015).…”

“…The presence of tungsten carbide (WC) in the DLC coatings causes the formation of the nanocomposite structure composed of nanocrystalline WC phase dispersed in amorphous carbon matrix, which is beneficial to the improvement of the coating's properties. A reduction in the sp 3 bond and an increase in the sp 2 bond occurs in the DLC-W coating, due to the presence of tungsten, which forms WC and W2C nanoclusters in amorphous carbon matrix (DAI et al, 2015), leading to an increase in disorder and increasing the spacing between the carbon atoms, reducing the number of coordinated carbon atoms and the atomic density, thereby causing a decrease in the density (BAI et al, 2021;LIU et al, 2015DAI et al, 2015, which is also responsible for the reduction in the hardness of the DLC-W. These results corroborate previous works (HOVSEPIAN et al, 2016;KRŽAN;NOVOTNY-FARKAS;VIŽINTIN, 2009;EVARISTO;FERNANDES;CAVALEIRO, 2020;TAKENO et al, 2008;BAI et al, 2021;LIU et al, 2015DAI et al, 2015.…”

“…A reduction in the sp 3 bond and an increase in the sp 2 bond occurs in the DLC-W coating, due to the presence of tungsten, which forms WC and W2C nanoclusters in amorphous carbon matrix (DAI et al, 2015), leading to an increase in disorder and increasing the spacing between the carbon atoms, reducing the number of coordinated carbon atoms and the atomic density, thereby causing a decrease in the density (BAI et al, 2021;LIU et al, 2015DAI et al, 2015, which is also responsible for the reduction in the hardness of the DLC-W. These results corroborate previous works (HOVSEPIAN et al, 2016;KRŽAN;NOVOTNY-FARKAS;VIŽINTIN, 2009;EVARISTO;FERNANDES;CAVALEIRO, 2020;TAKENO et al, 2008;BAI et al, 2021;LIU et al, 2015DAI et al, 2015. While CrN/DLC coatings possess higher sp 3 and lower sp 2 than DLC-W due to the high number of coordinated carbon atoms and higher atomic density.…”