Recent advances in hard, tough, and low friction nanocomposite coatings

Voevodin, Andrey A.; Zabinski, J.S.; Muratore, Christopher

doi:10.1016/s1007-0214(05)70135-8

Cited by 152 publications

(106 citation statements)

References 73 publications

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“…The multilayer coating approach is not unfamiliar in literature, as it is well known to improve the tribological behaviour of conventional systems like ceramic and metallic hard coatings [9][10][11], by increasing the adhesion between the coating and the substrate, allowing higher applied loads, surface stress reduction and improving crack propagation resistance [12]. Diamond multilayers were already grown on cemented carbide substrates aiming improvements in the cutting tools performance [13][14][15][16][17].…”

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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“…For example, the mixture of various phases at the nano-scale might achieve synergic effects to improve hardness or toughness. [14][15][16][17] Carbon-based nanocomposite coatings, where the nanocrystalline phase is embedded into an a-C matrix, are considered a new class of protective materials. Hitherto, a type of the most studied carbon-based nanocomposite can be fabricated by the doping of strong-carbide-forming (SCF) metal such as W, Ti or Cr and so on, where the metal can bond strongly with carbon to form carbide nanocrystallites in the a-C matrix.…”

Section: Introductionmentioning

confidence: 99%

Tailoring microstructure and phase segregation for low friction carbon-based nanocomposite coatings

Zhou

Wang

et al. 2012

J. Mater. Chem.

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Friction has a direct relation with the energy efficiency and environmental cleanliness in all moving mechanical systems. To develop low friction coatings is extremely beneficial for preserving not only our limited energy resources but also the earth's environment. This study proposes a new design for low friction carbon-based nanocomposite coatings by tailoring the microstructure and phase segregation, and thereby it contributes to better controlling the mechanical and tribological properties. Experimental findings and theoretical calculations reveal that high-hardness (18.2 GPa), high-adhesion strength (28 N) as well as low-internal stress (À0.8 GPa) can be achieved by a nanocrystallite/ amorphous microstructure architecture for the nc-WC/a-C(Al) carbon-based nanocomposite coating; in particular low friction ($0.05) can be acquired by creating a strong thermodynamic driving force to promote phase segregation of graphitic carbon from the a-C structure so as to form a low shear strength graphitic tribo-layer on the friction contact surfaces. This design concept is general and has been successfully employed to fabricate a wide class of low friction carbon-based nanocomposite coatings.

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“…5 exhibits a strength of 1.18 6 0.2 GPa with a strain at fracture of 6.34%. This high value of strength can be mainly associated with the strengthening due to grain refinement owing to a very small crystallite size, 13 solid-solution strengthening due to considerable difference in the atomic sizes of Si and Ge, 26,27 and strain hardening, 28 as these alloys are severely cold worked during high energy ball milling and there is always some residual strain, 27 even after sintering. 15 5, which suggests that the fractured surface exhibits a mixed morphology of shallow ductile dimples intermingled with fractured cleavage surfaces (mixed modes of brittle and ductile fracture), which is also corroborated with enhanced fracture toughness.…”

mentioning

confidence: 99%

Microstructure and mechanical properties of thermoelectric nanostructured n-type silicon-germanium alloys synthesized employing spark plasma sintering

Bathula

Gahtori

Jayasimhadri

et al. 2014

Applied Physics Letters

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Recent advances in hard, tough, and low friction nanocomposite coatings

Cited by 152 publications

References 73 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

Tailoring microstructure and phase segregation for low friction carbon-based nanocomposite coatings

Microstructure and mechanical properties of thermoelectric nanostructured n-type silicon-germanium alloys synthesized employing spark plasma sintering

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