CVD diamond coated silicon nitride self-mated systems: tribological behaviour under high loads

Abreu, C.S.; Oliveira, F.J.; Belmonte, Manuel; Fernandes, A.J.S.; Gomes, J.R.; Silva, Rui

doi:10.1007/s11249-006-9032-9

Cited by 44 publications

(27 citation statements)

References 32 publications

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“…Hence, some of the lowest friction coefficient (μ) values involving self-mated hard coatings under ambient conditions, without lubrication, were found for NCD (μ∼0.01-0.04), also offering high wear resistance (wear coefficient k∼10 −8 -10 −7 mm 3 N −1 m −1 ) [2][3][4]. Nonetheless, these coatings suffered delamination under tribological stress at lower loads (60 N) compared to those of the MCD system (80 N) [5,6], due to the higher content of non-diamond species at the grain boundaries and poorer adhesion to the substrate [7].…”

Section: Introductionmentioning

confidence: 99%

Self-mated tribological systems based on multilayer micro/nanocrystalline CVD diamond coatings

Salgueiredo¹,

Abreu²,

Amaral³

et al. 2013

Wear

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The tribological response of multilayer micro/nanocrystalline diamond coatings grown by the hot filament CVD technique is investigated. These multigrade systems were tailored to comprise a starting microcrystalline diamond (MCD) layer with high adhesion to a silicon nitride (Si3N4) ceramic substrate, and a top nanocrystalline diamond (NCD) layer with reduced surface roughness. Tribological tests were carried out with a reciprocating sliding configuration without lubrication. Such composite coatings exhibit a superior critical load before delamination (130 -200 N), when compared to the mono-(60-100 N) and bilayer coatings (110 N), considering ∼10 mm thick films. Regarding the friction behaviour, a short-lived initial high friction coefficient was followed by low friction regimes (friction coefficients between 0.02 and 0.09) as a result of the polished surfaces tailored by the tribological solicitation. Very mild to mild wear regimes (wear coefficient values between 4.1 10 −8 and 7.7 10 −7 mm 3 N −1 m −1 ) governed the wear performance of the self-mated multilayer coatings when subjected to highload short-term tests (60-200 N; 2 h; 86 m) and medium-load endurance tests (60 N; 16 h; 691 m).

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Section: Introductionmentioning

confidence: 99%

Self-mated tribological systems based on multilayer micro/nanocrystalline CVD diamond coatings

Salgueiredo¹,

Abreu²,

Amaral³

et al. 2013

Wear

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“…The wear rates of the Si 3 N 4 balls and the films were determined by measuring the sizes of the wear scars using the optical microscope. The ball wear rate used in the present study can be calculated using the expression [34]:…”

Section: Methodsmentioning

confidence: 99%

Tribological Characterization of Several Silicon-Based Materials Under Ionic-Liquids Lubrication

Xie

Wang

et al. 2009

Tribol Lett

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The tribological behaviors of three siliconbased materials (low temperature silicon oxide (LTO), polysilicon (Poly Si) and silicon nitride (Si 3 N 4 ) films) under ion liquids (ILs) lubrication have been investigated by varying the applied load and the sliding velocity. An atomic force microscope and a nanoindentor were used to characterize the deposited films, and the worn surfaces after frictional tests were analyzed by an optical microscope, a scanning electron microscope (SEM) with an energy dispersive spectrometer (EDS) and an X-ray photoelectron spectrometer (XPS). The results show the best lubricating properties of the IL lubricants are obtained at the intermediate load of 150 g for the three tribo-pairs. For the Si 3 N 4 /Si 3 N 4 tribo-pair, the coefficients of friction (COFs) and the wear rates under ILs lubrication are larger than those under dry friction. The COF values decrease with sliding velocity, and the COFs of the Si 3 N 4 /Si 3 N 4 tribo-pair are greater than the ones of the other two tribopairs (LTO/Si 3 N 4 and Poly Si/Si 3 N 4 ) at low velocities. The COF of 1-ethyl-3-methylimidazolium tetrafluoroborate is nearly 3 times larger than the other two IL lubricants (1-butyl-2,3-dimethylimidazolium tetrafluoroborate and N-butylpyridinium tetrafluoroborate) for the Si 3 N 4 /Si 3 N 4 tribo-pair. The differences in COFs between the latter two lubricants for the three tribo-pairs are negligible. Different mechanisms of these results have been analyzed in the paper.

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“…Details regarding substrate processing can be found in a previous work by the authors [8]. Geometries used in the present work were as follows: circular discs with 10 mm diameter and 3 mm of thickness, and 5 mm diameter balls.…”

Section: Methodsmentioning

confidence: 99%

“…The present authors have previously characterized the unlubricated tribological behaviour of homologous pairs of CVD diamond coated Si 3 N 4 [8]. The steady-state coefficient of friction displayed values in the range 0.03-0.04, regardless of the applied load (10-80 N).…”

Section: Introductionmentioning

confidence: 92%

CVD diamond water lubricated tribosystems for high load planar sliding

Abreu¹,

Salgueiredo

Oliveira

et al. 2008

Wear

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CVD diamond coated silicon nitride self-mated systems: tribological behaviour under high loads

Cited by 44 publications

References 32 publications

Self-mated tribological systems based on multilayer micro/nanocrystalline CVD diamond coatings

Self-mated tribological systems based on multilayer micro/nanocrystalline CVD diamond coatings

Tribological Characterization of Several Silicon-Based Materials Under Ionic-Liquids Lubrication

CVD diamond water lubricated tribosystems for high load planar sliding

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