Superlubricity of carbon nitride coatings in inert gas environments

Smart Tribological Coating

“…As such graded coat ngs are su table for softer substrates w th low st ffness. Graded coat ngs are often depos ted on steel substrates through n tr d ng [63] or carbon s ng [64] w th tools be ng coated to make them su table for appl cat ons such as form ng and mach n ng [65].…”

Lithium Citrate Triggered Macroscopic Superlubricity with Near-Zero Wear on an Amorphous Carbon Film

“…Friction and wear reduction are serious concerns in the industrial field with respect to reducing energy consumption and improving the safety service capability of equipment. , With the development of the lubrication technique, superlubricity is pursued in lubricating design to restrict the coefficient of friction (COF) under 0.01. , Solid coatings including molybdenum disulfide, carbon nitride two-dimensional (2D) transition metal carbides, and diamond-like carbon (DLC) have exhibited superlubricity properties under different environments. DLC films have attracted considerable research attention owing to their excellent chemical stability and extensive application prospects. , Therefore, fabricating DLC films on mechanical components is an effective method for improving their tribological properties.…”

“…1,2 With the development of the lubrication technique, superlubricity is pursued in lubricating design to restrict the coefficient of friction (COF) under 0.01. 3,4 Solid coatings including molybdenum disulfide, 5 carbon nitride 6 two-dimensional (2D) transition metal carbides, 7 and diamond-like carbon (DLC) 8 have exhibited superlubricity properties under different environments. DLC films have attracted considerable research attention owing to their excellent chemical stability and extensive application prospects.…”

Do DLC-like features in Raman spectra of tribofilms really mean they are DLC formed by friction?

“…Many Raman spectra of tribo lms reported in the literature show two characteristic vibrational bands of diamond-like carbon (DLC) [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29] at ~ 1360 cm − 1 and ~ 1570 cm − 1 , which are called D-and G-bands, respectively [31,32]. Note that this feature is typical of almost all amorphous carbon (a-C) materials, including cokes produced by thermal degradation of organics [31][32][33][34][35][36][37].…”

“…Various reactions can occur upon shear of molecules at tribological interfaces; these include degradation or fragmentation (dissociation) whose products will desorb or diffuse into the surrounding medium and/or formation of tribo lms that remain on the surface and provide bene cial lubrication effects [3][4][5][6][7][8][9][10]. Tribo lms, present inside the sliding track or piled up around the contact region, are often analyzed with Raman spectroscopy [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]. This technique is used because it provides vibrational spectroscopic information of 'small amounts' of samples.…”