Journal ArticleDOI
Magnetron sputtered hard a-C coatings of very high toughness
TLDR
In this article, hydrogen-free amorphous carbon coatings of high hardness (≈30 GPa) and toughness (plasticity from 50 to 60%) were deposited on 440C steel substrates by DC magnetron sputtering at a target power density of 10.5 W/cm2 in the bias range from −20 to −150 V. The surface topography, hardness and tribological behavior of the coatings were investigated.Abstract:
Hydrogen-free amorphous carbon coatings of high hardness (≈30 GPa) and toughness (plasticity from 50 to 60%) were deposited on 440C steel substrates by DC magnetron sputtering at target power density of 10.5 W/cm2 in the bias range from −20 to −150 V. The surface topography, hardness and tribological behavior of the coatings were investigated. With the increase of bias voltage, coating hardness and surface smoothness increased at expense of some adhesion strength and an increase of coefficient of friction. All coatings showed low friction in humid air and graphitization was observed after a high number of rotation cycles. The graphitization adds more benefit aside from reducing friction: the graphite layer can considerably reduce the adhesive wear since it prevents the asperities of the two surfaces to be adhered to each other.read more
Citations
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Toughness measurement of thin films: a critical review
TL;DR: In this article, the authors give a critical review of stress-based and energy-based methods for assessing the toughness of thin films and conclude that, for thin films, the energybased approach, especially the one independent of substrate, is more advantageous.
Journal ArticleDOI
Toughness evaluation of hard coatings and thin films
Sam Zhang,Xiaomin Zhang +1 more
TL;DR: In this paper, a recent development in fracture toughness measurement which involves the application of macrotension to a substrate in order to induce microtension in a patterned thin film is discussed.
Journal ArticleDOI
Microstructure and tribological properties of magnetron sputtered nc-TiC/a-C nanocomposite
TL;DR: In this article, nanocomposite nc-TiC/a-C coatings were deposited on polished stainless steel substrates and silicon wafers by co-sputtering of graphite and titanium targets at a low temperature of 150 °C.
Journal ArticleDOI
Nanocoatings for engine application
Narendra B. Dahotre,S. Nayak +1 more
TL;DR: A review of engineering coating for engine application is presented in this article, where issues relating to dimensional stability, tribological properties, lubrication, coefficient of friction, hot hardness, amenability for honing, surface roughness and topography, residual stress, adherence, damage tolerance and resistance, pores density and conditions and cost performance are discussed.
Journal ArticleDOI
Hard yet Tough Nanocomposite Coatings – Present Status and Future Trends
TL;DR: In this paper, the authors review the hardening and toughening mechanisms of nanocomposite films, and the toughness characterization techniques, and an outlook will be presented in the concluding remarks.
References
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The search for novel, superhard materials
TL;DR: The recent development in the field of superhard materials with Vickers hardness of ⩾40 GPa is reviewed in this article, where two basic approaches are outlined including the intrinsic superhard material, such as diamond, cubic boron nitride, C3N4, carbonitrides, etc. and extrinsic, nanostructured materials for which superhardness is achieved by an appropriate design of their microstructure.
Journal ArticleDOI
Ion‐Beam Deposition of Thin Films of Diamondlike Carbon
Sol Aisenberg,Ronald W. Chabot +1 more
TL;DR: Ion beam deposition of insulating carbon thin films on room temperature substrates, considering transparency, index of refraction, insulating capacity, glass scratching ability, etc. as discussed by the authors.
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Measurement of mechanical properties by ultra-low load indentation
TL;DR: In this paper, the use of sharp indenters and how they can be used to measure elastic modulus, hardness, and fracture toughness is discussed, which characterize the three primary modes of deformation in solids.
Journal ArticleDOI
Diamond-like carbon — present status
TL;DR: A detailed assessment of the current status of diamond-like carbon (DLC) film deposition is given in this article, where the authors discuss deposition systems, characterization methods, film properties and possible applications.