Preparation and characterization of silicon nitride codeposited electroless nickel composite coatings

Electrodeposited Ni–B–Si3N4 composite coating: Preparation and evaluation of its characteristic properties

“…Silicon nitride (Si 3 N 4 ) is a very hard ceramic material, which retains its room temperature strength up to 1200 • C and possesses excellent dimensional stability and oxidation resistance. The Ni-P, ED Ni-Co and EL Ni-P matrix by dispersing them in the respective plating baths [6][7][8][9][10][11]. Codeposition of Si 3 N 4 particles in ED Ni matrix is also possible by brush plating technique [12].…”

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

“…The surface defects in the coating influence the corrosion behavior and service lifetime of the EN coating causing easy access to the substrate. 11,35 Furthermore, since the MoS 2 particles have little conductivity (2:09 Â 10 À4 X À1 cm À1 ), 36 local galvanic cells probably were created on the surface of the coating in which the MoS 2 particles act as cathodic sites in contrast with the EN matrix that acts as an anodic site. 34 These local galvanic cells in the EN-MoS 2 coating can be another cause for the lower corrosion resistance of this coating in comparison with the EN coating.…”

“…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.…”

YSZ Reinforced Ni-P Composite by Electroless Nickel Co-Deposition

“…A study showed that the structural characteristics and phase transformation of EN co-deposition incorporating Si3N4, CeO2 and TiO2 remained unchanged as from those of the conventional EN deposition. In general, various factors have been shown to affect the deposition of EN composites, including (1) particle catalytic inertness, (2) particle charge, (3) EN bath composition, (4) bath reactivity, (5) particle compatibility with the matrix, (6) plating rate, and (7) particle size distribution (Feldstein 1990 (Dai, Liu et al 2009); (Das, Limaye et al 2007) Silicon carbide SiC (Berkh, Eskin et al March 1996); (Kalantary, Holbrook et al 1993); (Lin, Chen et al 2006 Particle stability in this case could be the charge stability of the particles in the solutions. Particle stability determines the particle dispersion in the solution and particles' tendency for agglomeration or sendimentation.…”