Homogeneous electroless Ni–P/SiO2 nanocomposite coatings with improved wear resistance and modified wear behavior

Electroless Nanocomposite Coatings: Synthesis, Characteristics, and Applications

“…To achieve a better wear resistance, it is necessary to ensure (i) a high number density of nanoparticles, (ii) uniform distribution, (iii) better integrity between the nanoparticles and the Ni-P matrix, and (iv) heat treatment to impart a high hardness and to present an incompatible surface for the counterface material during wear. The tribological performance of EL Ni-P nanocomposite coatings incorporated with CNTs/ MWCNTs [6][7][8]12], Si 3 N 4 [23], SiO 2 [42], Al 2 O 3 [25], HNT [18], WS 2 [20], and WC [15] nanoparticles confirms the above attributes.…”

The rheological behavior and stability of Mg(OH)2 aqueous suspensions in the presence of sodium polyacrylate

“…The effect of ionic strength on stability of suspensions has been widely researched both at moderate ionic strength [39,43,44] and high ionic strength [45][46][47]. The ionic strength can significantly affect the suspension stabilization by changing the thickness of electrical double layer in electrostatic stabilization [39,42,43] and also collapsing the extended polyelectrolyte layer in electrosteric stabilization [44,48].…”

Influence of SiO 2 nanoparticles on hardness and corrosion resistance of electroless Ni–P coatings

“…2c. The volume fraction of SiO 2 within Ni-P matrix is not expected to exceed 7% and does not exhibit a dramatic increase upon increasing the SiO 2 loading level in the bath from 1 to 2 g/L [20,22]. Nevertheless, such small amounts are sufficient to induce morphological changes in deposit characteristics.…”

“…Upon addition into the Ni-P coating matrix, the SiO 2 particles are believed to hinder dislocation movement, thus acting as a barrier to plastic deformation of the ductile matrix. The maximum degree of SiO 2 incorporation into Ni-P coatings is ~25 vol.% for 10 g/L of SiO 2 nanoparticles in the bath [20]. The SiO 2 nanoparticles have been reported to maximize microhardness and minimize wear rate upon heat treatment of the composite coatings [21].…”