Friction and wear behaviour of Mo–W doped carbon-based coating during boundary lubricated sliding

Hovsepian, P.Eh.; Mandal, Paranjayee; Ehiasarian, Arutiun P.; Sáfrán, György; Tietema, R.; Doerwald, D.

doi:10.1016/j.apsusc.2016.01.007

Cited by 38 publications

(25 citation statements)

References 31 publications

(43 reference statements)

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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 Spectramentioning

confidence: 99%

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 Spectramentioning

confidence: 99%

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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“…Tungsten and molybdenum have been reported to have been used to doped DLC films in order to reduce friction and wear rate during high temperature [52,53]. It is important to note the both tungsten and molybdenum will form carbide precipitates when doped with diamond-like carbon coatings [51,53]. A study of the tribological behavior of DLC-W on Aluminum alloy has been carried out under lubricated condition showed low COF (0.11) and wear rate (0.51 × 10 −5 mm 3 /Nm), which was due to the presence of tungsten disulphide (WS 2 ) [54].…”

Section: Tungsten and Molybdenum Doped Dlc Coatingsmentioning

confidence: 99%

“…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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“…Şekil [3,16]. Yapılan deneysel çalışmanın bu bağlamda temel sürtünme mekanizmasına aykırı olmadığı ve diğer deneysel çalışmalarla [17,24] örtüştüğü görülmüştür. SAE 80W yağı içerisine %5 Molykote-A katkısıyla hazırlanan karışımda gerçekleştirilen deneylerde elde edilen µort değerleriyle katkısız yağ ortamında elde edilen µort değerleri arasında neredeyse fark olmadığı saptanmıştır.…”

Section: Kütlesel Aşınma Miktarları Ve Sürtünme Katsayıları Sonuçlarıunclassified

“…Bunun sonucu olarak meydana gelen malzeme kayıpları, aşınan parçaların yenileriyle değiştirilme zorunluluğu, makinaların bakımonarım faaliyetleri için harcanan zaman ve emek, bu faaliyetler için istihdam edilen teknik personel, sürtünme sonucu oluşan enerji kayıpları göz önüne alındığında ekonomik açıdan tribolojiye olan ihtiyaç daha da artmaktadır [6]. Triboloji alanında yapılan araştırmalar genellikle; malzemelerin kinetik sürtünme katsayısının [7,8], dinamik sürtünme katsayısının [9,10] ve aşınma davranışlarının [11,12] belirlenmesi, talaşlı imalatta takım aşınma mekanizmasının [13,14] belirlenmesi, sürtünme ve aşınmaya sebep olan yüzeylerin birbirleriyle temaslarını kesecek katı yağlayıcı malzemelerin [15,16] araştırılması, yüksek sıcaklıkta çalışabilecek malzemelere yapılacak kaplamalara [17,18] ve kompozit malzemelere yapılacak kaplamalara [19] karar verilmesi, hareket eden sistemler içerisine üçüncü yapı olarak katılan toz katkılarının [20] davranışlarını, sürtünme önleyici endüstriyel yağlar [21,22] ve biyoyağlar [23] içerisine yapılan nano boyuttaki toz katkılarının etkileri gibi temel konuları içerir. Nanopartiküllerin sürtünme modifikatörleri ve yıpranma önleyici katkı maddeleri olarak kullanımı son on yılda triboloji alanında geniş ilgi görmektedir [24].…”

Section: Gi̇ri̇ş (Introduction)unclassified

MOS2 ve Grafit kaplamaların farklı ortam şartlarında tribolojik özelliklerinin araştırılması

Erdem

İmece²,

Tuc

2018

Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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Highlights:Graphical/Tabular Abstract  The designing and manufacturing of pindisc type tribometer  Wear experiments under different environmental conditions  The statistical calculation of the coating lifetime for a specific reliability value A pin-disc type tribometer was designed and manufactured for wear and friction tests. Figure A. The variation of average friction coefficients by different experiment weights Purpose: The aim of this study is to investigate tribological properties of MoS2 and graphite coatings under different environmental conditions. Theory and Methods:In this study, 10 mm in diameter and 20 mm length made of AISI1008 steel samples coated with graphite and MoS2 powders which widely used today as a solid lubricant with lead-spinning method. The experiments were carried out under three different environment; dry, oily and oil + 5% Molykote-A added. The properties of the abrasioned surfaces of the samples were investigated by optical microscope and scanning electron microscope. For 30%, 60% and 95% reliability values, the lifetime values of MoS2 and graphite coatings were statistically calculated. Results:In dry environment, MoS2 and graphite coatings were found to reduce friction by an average of 42% and 51%, respectively. The friction coefficients for MoS2 and graphite coatings in oily medium, were respectively about 10 times and 8 times lower than those in dry environment. In investigation of abrasioned surfaces, it was seen that scratch marks and locally metal regions on abrasioned surfaces which had worn in dry environment. In case of oily environmental, the coatings were superficially worn and no metal region was seen on abrasioned surfaces. The coating lifetime for MoS2 coated sample was calculated to be approximately 31.7 minutes and the lifetime for the graphite coated sample approximately 32 minutes. Conclusion:According to the results of the experiments, it has been found that coating any machine element surfaces with MoS2 or graphite can dramatically reduce the friction coefficient under dry environment. Limit of no use thickness (15 μm) that is also coating thicknesses of MoS2 ang graphite coated samples can withstand abrasion for approximately 32 minutes for 95% reliability with a test weight of 2 kg in dry environment.

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Friction and wear behaviour of Mo–W doped carbon-based coating during boundary lubricated sliding

Cited by 38 publications

References 31 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

MOS2 ve Grafit kaplamaların farklı ortam şartlarında tribolojik özelliklerinin araştırılması

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