Pulsed laser deposition of SiO2 - P2O5 - CaO - MgO glass coatings on titanium substrates

Abstract

Thin films of bioactive glass-ceramic have been deposited on titanium substrates by the Pulsed Laser Deposition (PLD) technique under different experimental conditions. The effect of parameters such as deposition pressure and temperature of heat treatments was studied. The microstructure and the crystalline phases of the coatings were characterized using SEM, EDX and XRD analysis; the phases present were titanium oxides, calcium magnesium silicates and phosphates. The adhesion of the as-deposited films has been examined by scratch tests. The interfacial adhesion of the coatings was better when the deposition was performed at low pressure. Samples were immersed in simulated body fluid (SBF), and a calcium-phosphate precipitate was observed on the surface of less crystallized samples, suggesting that there is some relationship between surface reactivity and crystallinity

Research Perspectives on Functional Micro and Nano Scale Coatings

“…Chemical and physical deposition processes are used to synthesize HA as coatings over a metallic surface, these deposition techniques are: biomimetics, (Uchida, Oyane, Kim, Kokubo, & Ito, 2004) sol-gel routes, (Melde & Stein, 2002;Padilla, Roman, Carenas, & Vallet-Regı, 2005;K. Zhang, Francis, Yan, & Stein, 2005) electrochemical deposition, (Liu, Savino, & Yates, 2011;Narayanan, Seshadri, Kwon, & Kim, 2008;Wang, Eliaz, & Hobbs, 2011) and others, (Li, Hong, Yu, & Qi, 2010;Li & Qi, 2008) as well as plasma spray, (Dong, Khor, Quek, White, & Cheang, 2003;Ellies, Nelson, & Featherstone, 1992;Khor, Dong, Quek, & Cheang, 2000) Pulsed Laser Deposition (PLD), (Carradò, 2011;Joanni et al, 2004) Ion and Electron Beam Deposition (IBD, EBD), (Jeong, Choe, & Eun, 2011;Rabiei et al, 2006) Electron Cyclotron Resonance deposition (ECR) (Akazawa & Ueno, 2013 and Radio Frequency Magnetron Sputtering (RF-MS) (Akazawa & Ueno, 2014;Boyd, Meenan, & Leyland, 2006). The challenge is produce a thin, dense, adherent, stoichiometric and crystalline HA coating over the implant surface, thus the HA coatings will be stable in a biological environments, (Bauer, Schmuki, von der Mark, & Park, 2013) and not to degrade along the time when inside of the human body.…”

Hydrogen permeation of tungsten phosphate glass thin films

“…In the deposition at relatively high pressure of oxygen gas, droplets of molten materials from the target are weakly connected with each other and adhesion between the resulting film and a substrate is weak [13]. Consequently, the as-deposited film was inappropriate for hydrogen permeation experiment.…”

Pulsed laser deposition and in vitro characteristics of triphasic – HASi composition on titanium

“…1 Among the various bioactive materials, bioactive glass compositions starting from the original bioglass®, a series of bioactive glasses have been proposed and a few of them have been found to be bone bonding. 1–3 The limited mechanical strength and low toughness of bioactive glasses has prevented their use as load-bearing devices. Combining the mechanical properties of metals or polymers with a bioactive phase with optimised properties has long been a goal in biomedical applications.…”

“…Also, various techniques attempted to suit the coating of bioactive glasses include sol-gel, electrophoresis, ion sputtering, plasma spraying and pulsed laser deposition. 3,13,14…”