Pulsed laser deposition of hydroxyapatite-diamondlike carbon multilayer films and their adhesion aspects

Abstract

We have developed a layered hydroxyapatite/diamondlike carbon/functionally gradient diamondlike carbon-silver/titanium carbide/titanium carbonitride/titanium nitride composite film using pulsed laser deposition. A diamondlike carbon interlayer between a hydroxyapatite coating and the Ti-6Al-4V alloy can serve several purposes, including preventing corrosion of Ti-6Al-4V alloy, overcoming poor adhesion between the hydroxyapatite coating and the titanium oxide surface, and reducing inflammation at the implant/tissue interface. Titanium nitride, titanium carbonitride (TiC x N y ), titanium carbide and functionally gradient diamondlike carbon-silver layers were used to improve the adhesion of diamondlike carbon films to Ti-6Al-4V alloy. We envision several potential medical applications for these multilayer materials, including use in orthopedic and dental devices.

Sol-Gel Derived Hydroxyapatite Coatings for Titanium Implants: A Review

“…In spite of biological performance enhancements that HAp can provide to the Ti surface, there are still many concerns about the use of HAp coatings, especially with regard to long-term reliability [ 101 ]. Implant retrieval studies have shown remarkable degradation of HAp coatings over short implantation time due to the poor adhesion of HAp-Ti interface [ 101 , 102 ]. The mismatch in coefficient of thermal expansion (CTE) between HAp and Ti surface is the main reason for the poor adhesion [ 86 , 103 , 104 ].…”

A Review on Ionic Substitutions in Hydroxyapatite Thin Films: Towards Complete Biomimetism

“…Another important trend that is emerging regarding ion-substituted hydroxyapatite thin films, is that of antibacterial coatings. To this regard, a wide range, and increasing amount, of literature is available about silver-doped hydroxyapatite, for which deposition by magnetron sputtering [74][75][76][77][78], PLD [79][80][81][82][83][84] and MAPLE [85] has been reported. Being the study of plasma assisted deposition of Ag-doped hydroxyapatite of more recent introduction, the majority of the studies focus on the influence of deposition parameters on the films characteristics and on the evaluation of antibacterial efficacy, while extensive, comparative in vivo studies are yet to be performed.…”

Ion-Substituted Calcium Phosphates Coatings

“…Moreover, it was recognized that R ku and R sk are parameters of key-importance when describing surface roughness of calcified tissue implants [84] because osteogenic cells' adhesion is sensitive to the stress concentrations which derive from the presence of sharp heights at the implant-tissue interface [85], likewise they can be considered against bacterial proliferation [86]. Inferred values for skewness and kurtosis parameters indicated a sharper heights (R ku~5 .6) distribution of surface features in case of Li-P structures as compared with Li-0 and Li-C ones (R ku~3 .1 and~3.5), with more peaks than valleys (R sk > 0) and that these peaks and valleys are much closer in height and depth for Li-P coatings (R sk~0 .17) than those of Li-0 and Li-C (R sk of 0.46 and 0.56, respectively).…”