Electrophoretic deposition and microstructure development of Si3N4/polyetheretherketone coatings on titanium alloy

Improvement of the Ti-6Al-4V Alloy’s Tribological Properties and Electrochemical Corrosion Resistance by Nanocomposite TiN/PEEK708 Coatings

“…Moreover, spherulites with a size of 3 to 7 lm were observed on the coating surface ( Figure 6). In contrast to Si 3 N 4 /PEEK704 coatings, [35] in which an open micro porosity was present and no spherulites were observed on the surface of the coatings, mainly nano porosity associated with spherulite formation occurred in the TiN/PEEK708 coatings. The occurrence of open pores, about 1 lm in size, was rather sporadic.…”

“…The same mechanism of deposition was indicated in our previous work on the co-deposition of amorphous Si 3 N 4 nanoparticles and PEEK704 micro particles. [35]…”

“…[11,16,17,19,[28][29][30][31] An alternative effective technique for the deposition of PEEK and PEEK-based coatings is electrophoretic deposition (EPD). [12][13][14][15][25][26][27][32][33][34][35][36] In previous studies of the authors, dense and well-adhered pure PEEK [32] and composite PEEK-based coatings [26,[33][34][35][36] have been successfully fabricated on titanium alloy substrates by EPD and subsequent heat treatment. Different reinforcing materials were used to enhance the PEEK properties, e.g., nanocrystalline Al 2 O 3 , [34] amorphous Si 3 N 4 nanoparticles (NPs), [35] and MoS 2 nanosheets.…”

“…[12][13][14][15][25][26][27][32][33][34][35][36] In previous studies of the authors, dense and well-adhered pure PEEK [32] and composite PEEK-based coatings [26,[33][34][35][36] have been successfully fabricated on titanium alloy substrates by EPD and subsequent heat treatment. Different reinforcing materials were used to enhance the PEEK properties, e.g., nanocrystalline Al 2 O 3 , [34] amorphous Si 3 N 4 nanoparticles (NPs), [35] and MoS 2 nanosheets. [36] Some inorganic NPs have been demonstrated to have the capability to reduce the friction and wear of PEEK.…”

“…The most homogeneous coatings were deposited from a suspension containing 50 vol pct of chitosan polyelectrolyte, but they were characterized by relatively high open porosity, due to the degradability of chitosan during post EPD heat treatment. [35] Because of its high hardness, chemical inertness and stability, as well as low COF, TiN NPs are widely used as a particulate-reinforced phase in composites. [37] However, no published article concerning TiN/PEEK nanocomposite coatings can be found in the available literature.…”