Influence of tungsten content on microstructure and properties of tungsten-doped graphite-like carbon films

Yong, Qingsong; Guo, Ma; Wang, Haidou; Chen, Shuying; Xu, Bin

doi:10.1557/jmr.2016.433

Cited by 11 publications

(8 citation statements)

References 34 publications

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“…This would be similar to that seen by Pei et al [73] with nano-crystallites of WC or W2C [72] surrounded by an amorphous matrix. The post-test results for coating B on HTS show a marked increase in ID/IG indicating graphitisation due to impact where coating C decreases in ID/IG suggesting higher sp 3 content and destruction of larger sp 2 clusters [74,75].…”

Section: Raman Spectrasupporting

confidence: 88%

“…Figure 6 shows the fitting of the D and G band peaks of Coating A on HTS. [72]. The ID/IG values are approaching that seen by Yong et al [72] indicating a structure more like graphitic-like carbon (GLC).…”

Section: Raman Spectramentioning

confidence: 65%

“…[72]. The ID/IG values are approaching that seen by Yong et al [72] indicating a structure more like graphitic-like carbon (GLC). Additionally, they identified a closely packed nano-particulate structure [72].…”

Section: Raman Spectramentioning

confidence: 65%

“…W doping in DLC films increases the sp 2 fraction of bonding present in the coating structure thereby giving it a more graphitic structure and softening the coating; clearly seen in Table 3 and Figure 4. The sp 2 ring structure and presence of tungsten in its microstructure imparts a high elastic modulus to the coating while also giving it a lower surface hardness with the added likelihood of the presence of nanoscrystalline WC or W2C [11,50,72,73,87]. Superior fatigue resistance is seen in tungsten doped DLC due to non-planar sp 2 carbon-carbon bonding allowing for greater compensation of shear stress [88].…”

Section: Coating Mechanical Propertiesmentioning

confidence: 99%

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Probing fatigue resistance in multi-layer DLC coatings by micro- and nano-impact: Correlation to erosion tests

McMaster

Liskiewicz

Neville

et al. 2020

Surface and Coatings Technology

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DLC coatings have seen recent use as protective coatings for flow control devices in the oil and gas industries. Improving fatigue resistance for multi-layered DLC coatings on hardened steel is key for improving their performance in this harsh environment of highly loads repetitive contact. This has been studied directly by micro-scale repetitive impact tests at significantly higher strain rate and energy than in the nano-impact test, enabling the study of coating fatigue with spherical indenters and dry erosion testing. Nano-impact has also been used to assess the initial fatigue behaviour of the coatings. Good correlation between microimpact results and erosion results was found. Hard multi-layered a-C:H and Si-a-C:H coatings were found to be significantly less durable under fatigue loading than a-C:H:W. The influence of the coating mechanical properties and structure on these differences is discussed.The results of this study provide further strong evidence that in highly loaded mechanical contact applications requiring a combination of load support and resistance to impact fatigue, the optimum lifetime of coated components may be achieved by designing the coating system to combine these properties rather than by solely aiming to maximise coating hardness as this may be accompanied by brittle fracture and higher wear.

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Section: Raman Spectrasupporting

confidence: 88%

Section: Raman Spectramentioning

confidence: 65%

Section: Raman Spectramentioning

confidence: 65%

Section: Coating Mechanical Propertiesmentioning

confidence: 99%

See 2 more Smart Citations

Probing fatigue resistance in multi-layer DLC coatings by micro- and nano-impact: Correlation to erosion tests

McMaster

Liskiewicz

Neville

et al. 2020

Surface and Coatings Technology

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show abstract

“…The tribological and mechanical properties of tungsten or molybdenum containing DLC coatings have high hardness, high elasticity and low surface energy, which causes a high hardness to elasticity ratio (H/E) and a low surface energy to hardness ratio (S/H) [52]. Consequently, leading to better adhesion properties, high wear resistance, low friction coefficient and low residual stress of the DLC-W and DLC-Mo [53,62,63]. Tribological properties of DLC coatings sometimes maybe affected by adhesion promoter (interlayer), substrate roughness, hydrogen incorporation and coating deposition parameters such as bias voltage (750v), etching, current (1.5A), precursor gas (C2H2/CH4/SiH4/Ar), pressure (2.3 mTorr), time (2 hours) and substrate temperature (200°C) [2].…”

Section: Tungsten and Molybdenum Doped Dlc Coatingsmentioning

confidence: 99%

Diamond-Like Carbon (DLC) Coatings for Automobile Applications

Kolawole¹,

Kolawole²,

Varela³

et al. 2021

Engineering Applications of Diamond

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Diamond-like carbon (DLC) coatings are amorphous carbon material which exhibits typical properties of diamond such as hardness and low coefficient of friction, characterized based on the sp3 bonded carbon and structure. The proportion of sp2 (graphetically) and sp3 (diamond-like) determines the properties of the DLC. This coating can be applied to automobile engine component in an attempt to provide energy efficiency by reducing friction and wear. However, DLC coatings are faced with issues of thermal instability caused by increasing temperature in the combustion engine of a vehicle. Therefore, it became necessary to seek ways of improving this coating to meetup with all tribological requirements that will be able to resist transformational change of the coating as the temperature increases. This chapter discusses the need for diamond-like carbon coatings for automobile engine applications, due to their ultra-low friction coefficient (<0.1) and excellent wear resistance (wear rate ~ 7 x 10−17 m3/N.m). The importance of DLC coatings deposited using PECVD technique, their mechanical and tribological properties at conditions similar to automobile engines would also be discussed. Non-metallic (hydrogen, boron, nitrogen, phosphorus, fluorine and sulfur) or metals (copper, nickel, tungsten, titanium, molybdenum, silicon, chromium and niobium) has been used to improve the thermal stability of DLC coatings. Recently, incorporation of Ag nanoparticles, TiO2 nanoparticles, WO3 nanoparticles and MoO3 nanoparticles into DLC has been used. The novel fabrication of diamond-like carbon coatings incorporated nanoparticles (WO3/MoO3) using PECVD for automobile applications has shown an improvement in the adhesion properties of the DLC coatings. DLC coatings had a critical load of 25 N, while after incorporating with WO3/MoO3 nanoparticles had critical load at 32 N and 39 N respectively.

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The improvement of diamond-like carbon coatings for tribological and tribo-corrosion applications in automobile engines: an updated review study

Kolawole

Kolade

Bello

et al. 2023

Int J Adv Manuf Technol

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Influence of tungsten content on microstructure and properties of tungsten-doped graphite-like carbon films

Abstract: Abstract

Cited by 11 publications

References 34 publications

Probing fatigue resistance in multi-layer DLC coatings by micro- and nano-impact: Correlation to erosion tests

Probing fatigue resistance in multi-layer DLC coatings by micro- and nano-impact: Correlation to erosion tests

Diamond-Like Carbon (DLC) Coatings for Automobile Applications

The improvement of diamond-like carbon coatings for tribological and tribo-corrosion applications in automobile engines: an updated review study

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