Improving the stability and bioactivity of micro-arc oxidized calcium phosphate/titania porous coatings by high energy shot peening pretreatment

Surface Modification Techniques of Titanium and its Alloys to Functionally Optimize Their Biomedical Properties: Thematic Review

“…In the early period after bone implantation, the piezoelectric effect of this coating may play a positive role in bone growth and bone integration. High energy shot peening (HESP) pretreatment can be used to enhance the stability and bioactivity of the TiO 2 coatings fabricated by MAO, Shen et al (2020) used this method to increase the effective doping of Ca & P elements on the surfaces. Novel “cortex-like” coatings were investigated by Li et al (2017 , 2018) , they have studied a macro/micro/nano triple hierarchical structure and micro/nano dual-scale structured TiO 2 coating on Ti.…”

Antibacterial and Osteogenic Functionalization of Titanium With Silicon/Copper-Doped High-Energy Shot Peening-Assisted Micro-Arc Oxidation Technique

“…No obvious cracks were observed on these porous coatings, which was related to the pretreatment of HESP. In our previous study ( Shen et al, 2020 ), we have demonstrated that the formation of coating cracks can be significantly inhibited by the residual compressive stress generated by the HESP treatment. In addition, the cross-sectional SEM images ( Figure 2A ) and eddy current thickness gauge result ( Figure 2B ) showed that that the porous coatings of MAO, Si-MAO, and Si/Cu-MAO (about 8.4 μm) were tightly bound to titanium substrates.…”

“…The HESP and MAO technologies were used to treat Ti for preparing target samples according to our previous study ( Shen et al, 2020 ). Briefly, Ti substrates were first polished with gradient sandpapers, cleaned using detergent/alcohol and dried at 60°C.…”

“…Among them, the bone-like porous coatings with ideal elastic modulus and wear resistance prepared by micro-arc oxidation (MAO) technology are favored and frequently used to prepare commercial Ti-based materials ( Szesz et al, 2014 ; Guo et al, 2020 ). In our recent work, we have used high-energy shot peening (HESP) pretreatment to significantly improve the comprehensive properties of MAO-treated porous coatings and proved its superior application potential under normal conditions ( Shen et al, 2020 ). However, although the HESP/MAO-prepared porous coatings have been proved to have good bioactivity, the osseointegration of the corresponding implants remains unsatisfactory when exposed to bacterial infection.…”

“…However, although the HESP/MAO-prepared porous coatings have been proved to have good bioactivity, the osseointegration of the corresponding implants remains unsatisfactory when exposed to bacterial infection. In the process of MAO treatment, a large number of ion channels will be formed on the surface of Ti, and then suitable ions can be enriched in these porous coatings ( Li G. et al, 2019 ; Shen et al, 2020 ). Thus, certain metal ions can be selected to further endow the HESP/MAO-treated samples with antibacterial properties.…”