114 Low Friction Systems with Carbon Nitride Coatings under High Temperature

友美, 渡; 脩裕, 山田; 恭輔, 佐藤; 貴法, 竹野; 幸志, 足立

doi:10.1299/jsmetohoku.2013.49.27

Cited by 1 publication

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“…detected by optical microscopy. This spectrum is similar to that of the low-frictional carbonaceous tribolayer with a nanoscaleorder thickness in the tribological system using CN x [17][18][19][20][21].…”

Section: Transformation Of the Carbonaceous Interface At The Lifetime...supporting

confidence: 64%

“…In particular, a carbon nitride (CN x ) coating, which is a type of DLC coating containing nitrogen in the carbon structure, has attracted significant attention because it can achieve low friction behavior and high wear resistance under unlubricated conditions in inert environments [13]. CN x coatings exhibit a low friction coefficient of less than 0.05 sliding against CN x or Si 3 N 4 under inert gas-blowing conditions or atmospheres (Ar, He, or N 2 gas) [14][15][16][17][18][19][20][21][22][23]. Wang et al and Watari et al reported that an invisible carbonaceous tribolayer with a nanometerordered thickness (approximately 10 nm or less), which has a carbon structure graphited from the initial structure of the coatings, was formed on the mating material when CN x coatings exhibited such low friction [14,19].…”

Section: Introductionmentioning

confidence: 99%

“…CN x coatings exhibit a low friction coefficient of less than 0.05 sliding against CN x or Si 3 N 4 under inert gas-blowing conditions or atmospheres (Ar, He, or N 2 gas) [14][15][16][17][18][19][20][21][22][23]. Wang et al and Watari et al reported that an invisible carbonaceous tribolayer with a nanometerordered thickness (approximately 10 nm or less), which has a carbon structure graphited from the initial structure of the coatings, was formed on the mating material when CN x coatings exhibited such low friction [14,19]. It is considered that the desorption of nitrogen in the structure promotes structural changes in carbon, resulting in the formation of a low-friction interface [22,24].…”

Section: Introductionmentioning

confidence: 99%

“…In this context, a hydrogenated carbon nitride (CN x :H) coating, which contains both nitrogen and hydrogen in the carbon structure, is an attractive material because of its potential to combine low friction properties with long durability [18,20,21]. Yamada et al reported that CN x :H coatings sliding against CN x coatings in a nitrogen environment exhibited low friction properties and a meager wear rate owing to the formation of a carbonaceous nanointerface, suggesting longer durability [18].…”

Section: Introductionmentioning

confidence: 99%

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Durability of Super-Low Friction of Hydrogenated Carbon Nitride Coatings in High-Vacuum Environment

Kuriyagawa,

Adachi

2024

Tribology Online

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The durability of super-low friction of hydrogenated carbon nitride (CN x :H) coatings sliding against Si 3 N 4 balls in high-vacuum (HV) environments and the phenomena that occur at the interface were clarified. In an HV, CN x :H achieved super-low friction (µ<0.01), which increased after a certain number of cycles even without coating delamination, indicating the existence of "the lifetime of super-low friction." During super-low friction, a carbonaceous tribolayer with a transformed structure from the initial CN x :H was formed on Si 3 N 4 and transformed to a similar structure to the initial CN x :H after friction increased. Scanning transmission electron microscopy and time-of-flight secondary ion mass spectroscopy (TOF-SIMS) revealed that the carbonaceous tribolayer during super-low friction had 10-15 nm thickness and chemically bonding with the Si 3 N 4 bulk. This changed to the interface with patch-like carbon adhesions after friction increased, indicating that the carbon transfer states from CN x :H transited during the lifetime. TOF-SIMS depth analysis revealed that desorption of the hydrogen content of CN x :H occurred on the friction surface at a depth of less than 10 nm. We concluded that the lifetime of super-low friction is due to the transformation of the tribolayer formed on Si 3 N 4 owing to the desorption of the hydrogen content of CN x :H.

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