A multilayer approach for enhancing the erosive wear resistance of CVD diamond coatings

Salgueiredo, E.; Almeida, F.A.; Amaral, M.; Neto, M.A.; Oliveira, F.J.; Silva, Rui

doi:10.1016/j.wear.2012.11.051

Cited by 48 publications

(20 citation statements)

References 30 publications

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“…This mechanism delays total delamination of the diamond coating from the substrate, unlike what would happen with monolayer coatings. This gradual loosening of material without total film spallation was already observed in erosion tests of multilayer diamond coatings with SiC particles [19]. In that work, the multilayer films presented a much improved erosion relatively to the mono-layer coatings of MCD and NCD that suffered from faster wear with substrate exposure.…”

Section: Ml10x2-multi-pass Testssupporting

confidence: 69%

“…The thinner coating, ML10x1 could not withstand the stresses at the cutting tip, with delamination occurring at the first moments of contact between the tool and the workpiece material or after a few seconds of machining, as was found by other authors [5,16]. In such thin coatings, the region of maximum stresses lies at the substrate/diamond interface or below, inducing prompt delamination [19]. PCD tools never show an abrupt increase of the cutting force in the machining of MMCs.…”

Section: Multilayer Mcd/ncd Coatingsmentioning

confidence: 63%

“…These values are nearly double for the ML10x2 coatings. This coating architecture relies on the strong adhesion of a first layer of MCD to the plasma etched Si 3 N 4 ceramic substrate [22] and on the insertion of intermediate MCD layers creating MCD/NCD interfaces that act as energy sinks to crack propagation [19]. The top layer is of NCD to ensure a smoother surface, R a (ML10x1) = 79 ± 7 nm and R a (ML10x2) = 145 ± 6 nm, relatively to uncoated, etched substrates, or to substrates coated solely with MCD [18].…”

Section: Multilayer Mcd/ncd Coatingsmentioning

confidence: 99%

See 2 more Smart Citations

Multilayer CVD Diamond Coatings in the Machining of an Al6061-15 Vol % Al2O3 Composite

et al. 2017

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Abstract:Ceramic cutting inserts coated with ten-fold alternating micro-and nanocrystalline diamond (MCD/NCD) layers grown by hot filament chemical vapor deposition (CVD) were tested in the machining of an Al based metallic matrix composite (MMC) containing 15 vol % Al 2 O 3 particles. Inserts with total coating thicknesses of approximately 12 µm and 24 µm were produced and used in turning: cutting speed (v) of 250 to 1000 m·min −1 ; depth of cut (DOC) from 0.5 to 3 mm and feed (f ) between 0.1 and 0.4 mm·rev −1 . The main cutting force increases linearly with DOC (ca. 294 N per mm) and with feed (ca. 640 N per mm·rev −1 ). The thicker coatings work within the following limits: DOC up to 1.5 mm and maximum speeds of 750 m·min −1 for feeds up to 0.4 mm·rev −1 . Flank wear is predominant but crater wear is also observed due to the negative tool normal rake. Layer-by-layer wear of the tool rake, and not total delamination from the substrate, evidenced one of the advantages of using a multilayer design. The MCD/NCD multilayer diamond coated indexable inserts have longer tool life than most CVD diamond systems and behave as well as most polycrystalline diamond (PCD) tools.

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Section: Ml10x2-multi-pass Testssupporting

confidence: 69%

Section: Multilayer Mcd/ncd Coatingsmentioning

confidence: 63%

Section: Multilayer Mcd/ncd Coatingsmentioning

confidence: 99%

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Multilayer CVD Diamond Coatings in the Machining of an Al6061-15 Vol % Al2O3 Composite

et al. 2017

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“…Diamond can be refined by an appropriate amount of boron dopant on a single layer diamond coating. This will also reduce film residual stress, change grain size and improve quality of the coating [22][23][24]. The Raman spectroscopy reveals that the undoped diamond coatings show compressive stresses, while the BDD coatings show tensile stresses.…”

Section: Introductionmentioning

confidence: 99%

Influence of boron doping on mechanical and tribological properties in multilayer CVD-diamond coating systems

et al. 2016

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Titanium alloy (Ti6Al4V) substrates were deposited with smooth multilayer coatings, by hot filament chemical vapour deposition technique. The effect of boron doping on lattice parameter, residual stresses, hardness and coefficient of friction in multilayer-diamond coating system was studied. The frictional behaviour of the coatings was studied using a ball-on-disc micro-tribometer by sliding the coated samples of titanium alloy (Ti6Al4V) substrates against alumina (Al 2 O 3) balls, and increasing normal load from 1 to 10 N. The average friction coefficient decreased from 0.36 to 0.29 for undoped multilayer-diamond coating system and from 0.33 to 0.18 for borondoped (BD) multilayer-diamond coating system. The average indentation depths for undoped and BD multilayerdiamond coating systems were found to be equal to ∼58 and ∼65 nm, respectively, and their hardness values were 60 and 55 GPa, respectively. Keywords. Boron doping; multilayer CVD-diamond coatings; nano-indentation; Al 2 O 3 ; hardness; friction coefficient.

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“…Hence, considering that MCD film and NCD film can complement each other, multilayer technique is designed with MCD film as bottom layer and NCD film as top layer [16][17][18]. Recent studies have showed that the multilayer structure has superior friction performance, critical load and adhesion strength compared to monolayer structure [19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Effect of bottom micro-crystalline diamond (MCD) layer and top nano-crystalline diamond (NCD) layer onto the tribological behavior of (MCD/NCD) bilayer film

Luo

et al. 2020

Mater. Res. Express

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In this study, a comparative study of a series of (MCD/NCD) bilayer films with different MCD grain sizes and NCD layer thickness deposited on cemented tungsten carbide (WC-Co) flat substrates was conducted by changing the deposition time. Tribological behaviors of these diamond films were evaluated by using a reciprocal tribometer without lubrication. In friction test against Si 3 N 4 balls, the (3hMCD/6hNCD) bilayer film showed the lowest coefficient of friction (0.059) and wear rates of counterpart balls (1.75×10 −6 mm 3 N −1 m −1 ) because of its lowest surface roughness and higher sp 2 content. This work provides a guide to choose suitable (MCD/NCD) bilayer basic structure in multilayer diamond film for getting a fine diamond film with low roughness and great tribological performance for different applications.

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A multilayer approach for enhancing the erosive wear resistance of CVD diamond coatings

Cited by 48 publications

References 30 publications

Multilayer CVD Diamond Coatings in the Machining of an Al6061-15 Vol % Al2O3 Composite

Multilayer CVD Diamond Coatings in the Machining of an Al6061-15 Vol % Al2O3 Composite

Influence of boron doping on mechanical and tribological properties in multilayer CVD-diamond coating systems

Effect of bottom micro-crystalline diamond (MCD) layer and top nano-crystalline diamond (NCD) layer onto the tribological behavior of (MCD/NCD) bilayer film

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