The friction and wear of Ni–P–PTFE composite deposits under water lubrication

Preparation and characterization of silicon nitride codeposited electroless nickel composite coatings

“…Inclusion of particles like aluminum oxide [3][4][5], silicon carbide [5][6][7][8][9], boron carbide [10,11], chromium carbide [11], tungsten carbide [11] and diamond [11,12] imparts hardness to the electroless nickel and hence improves wear and impact resistance of the composite. Low coefficient of friction and hence improved wear properties can be achieved by the inclusion of boron nitride [13], molybdenum sulphide [14,15] and PTFE [16][17][18][19] particles in the nickel matrix. Studies have also been carried out to develop coatings consisting of both a hard and a soft particle such as silicon carbide and PTFE that imparts resistance to both corrosion and abrasion [20,21].…”

“…Composite coatings containing either hard or lubricating particles can alleviate the corrosion and wear problems encountered by ferrous bearings in water lubricated applications; the former reduces abrasion due to its hardness, later by lowering the friction. Ger et al have studied friction and wear of Ni-P-PTFE in water-lubricated environment [19]. EN coatings can be classified as low (≤5 wt.%), medium (5-8 wt.%) and high (≥9 wt.%) phosphorous deposit [22].…”

The heat treatment effects on the structure and wear behavior of pulse electroforming Ni–P alloy coatings

“…Although Ni-Fe and Ni-Co alloys have good hardness at room temperature, their softening phenomenon are evident when the temperature is rising, the hardness of Ni-P alloy, however, can be enhanced by precipitate strengthened effect which is a result of heat treatment and it promotes the hardness significantly [7]. Among these, Ni-P alloy possesses high hardness, high strength and other superior mechanical properties; so that, electroless Ni-P alloy or composites have been approved that they are suitable used in automobiles, aviation, food, printing, chemical, and other instruments [8][9][10][11][12]. Unfortunately, the operating conditions of electroless technique are difficult to alter and are unsuitable for thick film coating deposition.…”

Wear and corrosion properties of electroless nickel composite coatings with PTFE and/or MoS2 particles

“…1,2 Co-deposition of different particles in this coating leads to electroless nickel composite coatings. 3,4 Hard particles, such as silicon carbide, 5-7 aluminum oxide, 8,9 titanium oxide, 10 silicon nitride, 11,12 and diamond 13 enhance wear resistance of EN coating by increasing the hardness of the coating, while solid lubricant particles, such as polytetrafluoroethylene (PTFE), [14][15][16][17][18][19] molybdenum disulfide (MoS 2 ), [20][21][22] molybdenum nitride (Mo 2 N), 23 graphite, 24 and carbon nanotubes 25 improve tribological properties of the coating by reducing its friction coefficient. Among these lubricants, PTFE particles provide very low friction coefficient but show a low useful load-bearing capacity and should only be considered at low-speed wearing systems.…”