Journal ArticleDOI
The role of hydrogen in tribological properties of diamond-like carbon films☆
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TLDR
In this paper, a very close relationship between the hydrogen-to-carbon (H/C) ratios of source gases and the friction and wear coefficients of the resultant diamond and diamond-like carbon (DLC) films was found.Abstract:
Extensive research on diamond and diamondlike carbon (DLC) films in our laboratory has further confirmed that hydrogen plays an important role in the tribological properties of these films. Specifically, model experiments in inert gas environments revealed a very close relationship between the hydrogen-to-carbon (H/C) ratios of source gases and the friction and wear coefficients of the resultant DLC films. The friction coefficient of films grown in source gases with very high H/C ratios (e.g. 10) was superlow (0.003), whereas that of hydrogen-free DLC films (with essentially zero H/C ratio) was very high (0.65). The friction coefficients of films grown in source gases with intermediate H/C ratios were between 0.003 and 0.65. Experiments also revealed that the frictional properties of these films were very sensitive to test environments. Specifically, when tested in open air, the friction coefficient of hydrogen-free DLC dropped to 0.25, whereas that of highly-hydrogenated DLC increased to 0.06. Fundamental knowledge combined with surface analytical and tribological studies have led to the conclusion that the type and extent of chemical interactions between carbon–carbon, carbon–hydrogen, and carbon–adsorbate atoms at the sliding-contact interfaces determine the friction and wear properties of DLC films.read more
Citations
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Journal ArticleDOI
Tribology of diamond-like carbon films: recent progress and future prospects
Ali Erdemir,C. Donnet +1 more
TL;DR: Diamond-like carbon (DLC) films have attracted an overwhelming interest from both industry and the research community as mentioned in this paper, and they offer a wide range of exceptional physical, mechanical, biomedical and tribological properties that make them commercially essential for numerous industrial applications.
Journal ArticleDOI
Friction of diamond-like carbon films in different atmospheres
TL;DR: In this paper, a series of model experiments are performed in high vacuum and with various added gases to elucidate the influence of different test environments on the tribological behavior of three diamond-like carbon (DLC) films.
Journal ArticleDOI
Genesis of superlow friction and wear in diamondlike carbon films
TL;DR: In this article, a new class of diamond-like carbon (DLC) films were developed that provided friction and wear coefficients of 0.001−0.005 and 10 −10−10 −10 −9 mm 3 /N m, respectively, in inert-gas or vacuum test environments.
Journal ArticleDOI
Friction-induced structural transformations of diamondlike carbon coatings under various atmospheres
TL;DR: In this paper, the authors performed friction tests with uncoated steel balls against coated substrates at contact stresses of 1 GPa in ambient air (RFI = 30-40%), dry air (RH < 1%), and dry nitrogen (< 1%).
Journal ArticleDOI
Frictional behavior of diamondlike carbon films in vacuum and under varying water vapor pressure
TL;DR: Frictional behavior of diamond-like carbon films in vacuum and under varying water vapor pressure was studied in this article, showing that the properties of diamondlike carbon film can change with the temperature.
References
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Journal ArticleDOI
Characterization of diamond films by Raman spectroscopy
Diane S. Knight,William B. White +1 more
TL;DR: The Raman spectrum of hexagonal diamond (lonsdaleite) is distinct from that of the cubic diamond and allows it to be recognized as discussed by the authors, and the Raman line width varies with mode of preparation of the diamond and has been related to degree of structural order.
Journal ArticleDOI
Synthesis of diamondlike carbon films with superlow friction and wear properties
TL;DR: In this article, a diamond-like carbon (DLC) film with a friction coefficient of 0.001 and wear rate of 10.9 to 10.10 mm{sup 3}/N.
Journal ArticleDOI
Chemical, mechanical and tribological characterization of ultra-thin and hard amorphous carbon coatings as thin as 3.5 nm: recent developments
TL;DR: In this article, the chemical, mechanical and tribological properties of the diamond-like carbon (DLC) coatings are discussed and a review of recent developments in the chemical and mechanical characterization of the ultra-thin coatings is presented.
Journal ArticleDOI
Superlow friction behavior of diamond-like carbon coatings: Time and speed effects
TL;DR: In this article, the friction behavior of a diamond-like carbon coating was studied in reciprocating sliding contact at speeds from 0.01 to 5 mm/s, in dry nitrogen.
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