Journal
MATERIALS
Volume 15, Issue 19, Pages -Publisher
MDPI
DOI: 10.3390/ma15196828
Keywords
antibacterial effect; biocompatibility; calcium phosphate; ion substitution; physical vapor deposition; thin films
Categories
Funding
- [FWRW-2021-0007]
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This study investigates the deposition of antibacterial coatings on titanium alloy implant surfaces using RF magnetron sputtering. The research shows that the properties of the deposited coatings are influenced by the elemental composition and structure of the RF magnetron targets, as well as the substrate temperature during deposition and post-deposition heat treatment. Sintering the targets results in structural changes, while the use of nanostructured titanium improves the scratch resistance of the coatings.
Functionalization of titanium (Ti)-based alloy implant surfaces by deposition of calcium phosphates (CaP) has been widely recognized. Substituted hydroxyapatites (HA) allow the coating properties to be tailored based on the use of different Ca substitutes. The formation of antibacterial CaP coatings with the incorporation of Zn or Cu by an RF magnetron sputtering is proposed. The influence of RF magnetron targets elemental composition and structure in the case of Zn-HA and Cu-HA, and the influence of substrate's grain size, the substrate's temperature during the deposition, and post-deposition heat treatment (HT) on the resulting coatings are represented. Sintering the targets at 1150 degrees C resulted in a noticeable structural change with an increase in cell volume and lattice parameters for substituted HA. The deposition rate of Cu-HA and Zn-HA was notably higher compared to stochiometric HA (10.5 and 10) nm/min vs. 9 +/- 0.5 nm/min, respectively. At the substrate temperature below 100 degrees C, all deposited coatings were found to be amorphous with an atomic short-range order corresponding to the {300} plane of crystalline HA. All deposited coatings were found to be hyper-stochiometric with Ca/P ratios varying from 1.9 to 2.5. An increase in the substrate temperature to 200 degrees C resulted in the formation of equiaxed grain structure on both coarse-grained (CG) and nanostructured (NS) Ti. The use of NS Ti notably increased the scratch resistance of the deposited coatings from18 +/- 1 N to 22 +/- 2 N. Influence of HT in air or Ar atmosphere is also discussed. Thus, the deposition of Zn- or Cu-containing CaP is a complex process that could be fine-tuned using the obtained research results.
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