Preparation of Bioactive Titanium Film via Anodic Oxidation in Agitation Condition

2016 ◽  
Vol 840 ◽  
pp. 220-224
Author(s):  
Te Chuan Lee ◽  
Mohd Hafifi Hafizat Mazlan ◽  
Mohamad Imran Abbas ◽  
Hasan Zuhudi Abdullah ◽  
Maizlinda Izwana Idris
Keyword(s):  
Oxide Layer ◽  
Surface Properties ◽  
Anodic Oxidation ◽  
Disodium Salt ◽  
Agitation Speed ◽  
Ion Diffusion ◽  
Titanium Film ◽  
Protective Oxide ◽  
Single Lens ◽  
Titanium Foils

Anodic oxidation is a well-established surface modification method which combines electric field driven metal and oxygen ion diffusion to produce protective oxide layer on metals. This method has been widely used to modify the surface properties of titanium and its alloy. This present study aims to investigate the effect of agitation speed on the surface properties of anodised titanium. At first, the high purity titanium foils were anodised in mixture of 0.04 M β-glycerophosphate disodium salt pentahydrate (β-GP) and 0.4 M calcium acetate monohydrate (CA) at 350 V and 30 mA.cm-2 for 10 minutes at different agitations speed (300 rpm - 1500 rpm). Next, surface properties of anodised titanium were characterised by digital single-lens reflex camera (DSLR camera), field emission scanning electron microscopy (FESEM) and glancing angle X-ray diffractometer (GAXRD). At lower agitation speed (≤ 900 rpm), surface of anodised titanium covered by small donut-shaped pores. With increasing of agitation speed (≥ 1100 rpm), the oxide layer became more porous and covered by larger donut-shaped pores. Rutile TiO2 peaks were detected at agitation speed more than 1100 rpm. Agitation condition is believed to be an effective method to enhance the surface properties of anodised titanium for biomedical applications.

Effect of Electrolyte Concentration on Anodised Titanium in Mixture of β-Glycerophosphate (β-GP) and Calcium Acetate (CA)

2015 ◽  
Vol 1087 ◽  
pp. 116-120 ◽  
Author(s):  
Te Chuan Lee ◽  
Maizlinda Izwana Idris ◽  
Hasan Zuhudi Abdullah ◽  
Charles Christopher Sorrell
Keyword(s):  
Oxide Layer ◽  
Applied Voltage ◽  
Focused Ion Beam ◽  
Electrolyte Concentration ◽  
Ion Beam ◽  
Digital Camera ◽  
Disodium Salt ◽  
Calcium Acetate ◽  
Anode Surface ◽  
Ion Diffusion

Anodic oxidation is a surface modification method which combines electric field driven metal and oxygen ion diffusion for formation of oxide layer on the anode surface. Anodised titanium has been widely use in biomedical applications especially in dental implant. This study aimed to investigate the effect of electrolyte concentration on titanium. Specifically, the titanium foil was anodised in mixture of β-glycerophosphate disodium salt pentahydrate (β-GP) and calcium acetate monohydrate (CA) with different concentration (0.02 M + 0.2 M and 0.04 M + 0.4 M), anodising time (10 min), applied voltage (150, 200, 250, 300 and 350 V) and current density (10 mA.cm-2) at room temperature. Surface oxide properties of anodised titanium were characterised by using glancing angle X-ray diffraction (GAXRD), field emission scanning electron microscope (FESEM), focused ion beam (FIB) milling and digital camera. With increasing electrolyte concentration, the oxide layer became more porous. The GAXRD results also showed that rutile formed at high applied voltage (≥300 V) when the higher concentration of electrolyte was used.

Effect of Ultrasonic Amplitude on Surface Properties of Anodised Titanium for Biomedical Application

2016 ◽  
Vol 840 ◽  
pp. 160-164 ◽  
Author(s):  
Te Chuan Lee ◽  
Mohd Hafifi Hafizat Mazlan ◽  
Mohamad Imran Abbas ◽  
Hasan Zuhudi Abdullah ◽  
Maizlinda Izwana Idris
Keyword(s):  
Surface Properties ◽  
Biomedical Application ◽  
Low Cost ◽  
Disodium Salt ◽  
Anode Surface ◽  
Simple Method ◽  
Force Microscopy ◽  
Atomic Force ◽  
Ceramic Films ◽  
Titanium Foils

Anodic oxidation is an electrochemical method for the production of ceramic films on a metallic substrate. It is a simple and low cost method to produce bioactive material. This work describes the effect of ultrasonic amplitude on the surface properties of anodised titanium. Specifically, high purity titanium foils were anodised in mixture of 0.04 M β-glycerophosphate disodium salt pentahydrate (β-GP) and 0.4 M calcium acetate monohydrate (CA) at 350 V and 70 mA.cm-2 for 10 minutes. The ultrasonic amplitude was varied from 20-60 μm. Next, field emission scanning electron microscopy (FESEM) glancing angle X-ray diffractometer (GAXRD) and atomic force microscopy (AFM) were used to characterise the anodised titanium. The results showed that application of sonication is able to remove the entrapped bubbles on the anode surface and enhance the oxidation process. The pores size and surface roughness were increased as increasing of ultrasonic amplitude. At ultrasonic amplitude ≥ 50 μm, rutile TiO2 was formed on the surface of oxide layer. It was found that the sonication is a simple method to improve the surface properties of anodised titanium for implant applications.

Characterisation and In Vitro Bioactivity of UV-Treated Anodised Titanium

2015 ◽  
Vol 1125 ◽  
pp. 450-454
Author(s):  
Te Chuan Lee ◽  
M.F.M. Rathi ◽  
M.Y.Z. Abidin ◽  
Hasan Zuhudi Abdullah ◽  
Maizlinda Izwana Idris
Keyword(s):  
Surface Properties ◽  
Uv Light ◽  
Treatment Method ◽  
Ceramic Coatings ◽  
Light Treatment ◽  
Disodium Salt ◽  
X Ray ◽  
Ceramic Films ◽  
Titanium Foils

Anodic oxidation is an electrochemical method for the production of ceramic films on a metallic substrate. It has been widely used to deposit the ceramic coatings on the metals surface. Recently, ultraviolet (UV) light treatment is gaining recognition as a new potential surface treatment method. This study aims to investigate the effect of UV light treatment on the surface properties and in vitro bioactivity of anodised titanium. At first, the titanium foils were anodised in mixture of β-glycerophosphate disodium salt pentahydrate (β-GP) and calcium acetate monohydrate (CA). Subsequently, the anodised titanium was pre-treated with UVA lamp (peak wavelength of 365 nm) and immersed in simulated body fluid (SBF). Field emission scanning electron microscopy (FESEM), X-ray diffractometer (XRD) and goniometer were used to characterise the surface properties, crystallinity and surface wettability of untreated titanium (UT), anodised titanium (AT) and UV-treated anodised titanium (UTAT). UTAT became more hydrophilic if compared to the UAT. The result of SBF showed that bone-like apatite was precipitated on the surface of UTAT. The results indicated that hydrophilic surface is able to accelerate the growth of bone-like apatite.

scholarly journals Electrochemical Anodizing Treatment to Enhance Localized Corrosion Resistance of Pure Titanium

2017 ◽  
Vol 15 (1) ◽  
pp. 19-24 ◽  
Author(s):  
Davide Prando ◽  
Andrea Brenna ◽  
Fabio M. Bolzoni ◽  
Maria V. Diamanti ◽  
Mariapia Pedeferri ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Titanium Alloys ◽  
Oxide Layer ◽  
Corrosion Behavior ◽  
Pure Titanium ◽  
Localized Corrosion ◽  
Anodic Current Density ◽  
Anodic Current ◽  
Protective Oxide ◽  
Pitting Potential

Background Titanium has outstanding corrosion resistance due to the thin protective oxide layer that is formed on its surface. Nevertheless, in harsh and severe environments, pure titanium may suffer localized corrosion. In those conditions, costly titanium alloys containing palladium, nickel and molybdenum are used. This purpose investigated how it is possible to control corrosion, at lower cost, by electrochemical surface treatment on pure titanium, increasing the thickness of the natural oxide layer. Methods Anodic oxidation was performed on titanium by immersion in H2SO4 solution and applying voltages ranging from 10 to 80 V. Different anodic current densities were considered. Potentiodynamic tests in chloride- and fluoride-containing solutions were carried out on anodized titanium to determine the pitting potential. Results All tested anodizing treatments increased corrosion resistance of pure titanium, but never reached the performance of titanium alloys. The best corrosion behavior was obtained on titanium anodized at voltages lower than 40 V at 20 mA/cm2. Conclusions Titanium samples anodized at low cell voltage were seen to give high corrosion resistance in chloride- and fluoride-containing solutions. Electrolyte bath and anodic current density have little effect on the corrosion behavior.

Bond coating issues in thermal barrier coatings for industrial gas turbines

2005 ◽  
Vol 219 (2) ◽  
pp. 101-107 ◽  
Author(s):  
I. G. Wright ◽  
B. A. Pint
Keyword(s):  
High Temperature ◽  
Oxide Layer ◽  
Thermal Barrier Coatings ◽  
Gas Turbines ◽  
Metallic Surface ◽  
Thermal Barrier ◽  
Protective Oxide ◽  
Barrier Coatings ◽  
Bond Coating ◽  
Industrial Gas Turbines

Thermal barrier coatings are intended to work in conjunction with internal cooling schemes to reduce the metal temperature of critical hot gas path components in gas turbine engines. The thermal resistance is typically provided by a 100-250 μm thick layer of ceramic (most usually zirconia stabilized with an addition of 7–8 wt% of yttria), and this is deposited on to an approximately 50 μ thick, metallic bond coating that is intended to anchor the ceramic to the metallic surface, to provide some degree of mechanical compliance, and to act as a reservoir of protective scale-forming elements (Al) to protect the underlying superalloy from high-temperature corrosion. A feature of importance to the durability of thermal barrier coatings is the early establishment of a continuous, protective oxide layer (preferably α-alumina) at the bond coating—ceramic interface. Because zirconia is permeable to oxygen, this oxide layer continues to grow during service. Some superalloys are inherently resistant to high-temperature oxidation, so a separate bond coating may not be needed in those cases. Thermal barrier coatings have been in service in aeroengines for a number of years, and the use of this technology for increasing the durability and/or efficiency of industrial gas turbines is currently of significant interest. The data presented were taken from an investigation of routes to optimize bond coating performance, and the focus of the paper is on the influences of reactive elements and Pt on the oxidation behaviour of NiAl-based alloys determined in studies using cast versions of bond coating compositions.

scholarly journals Transfer of Graphene with Protective Oxide Layers

2018 ◽  
Vol 2 (4) ◽  
pp. 58 ◽  
Author(s):  
Haim Grebel ◽  
Liliana Stan ◽  
Anirudha Sumant ◽  
Yuzi Liu ◽  
David Gosztola ◽  
...  
Keyword(s):  
Oxide Layer ◽  
Optical Transmission ◽  
Chemical Vapor ◽  
Atomic Layer ◽  
Protective Oxide ◽  
Layer Deposition ◽  
Thin Polymer ◽  
Oxide Deposition ◽  
Polymeric Layer ◽  
Graphene Transfer

Transfer of graphene, grown by chemical vapor deposition (CVD), to a substrate of choice, typically involves the deposition of a polymeric layer (for example, poly(methyl methacrylate) (PMMA), or polydimethylsiloxane, PDMS). These polymers are quite hard to remove without leaving some residues behind. One method to improve the graphene transfer is to coat the graphene with a thin protective oxide layer, followed by the deposition of a very thin polymer layer on top of the oxide layer (much thinner than the usual thickness), followed by a more aggressive polymeric removal method, thus leaving the graphene intact. At the same time, having an oxide layer on graphene may serve applications, such as channeled transistors or sensing devices. Here, we study the transfer of graphene with a protective thin oxide layer grown by atomic layer deposition (ALD). We follow the transfer process from the graphene growth stage through oxide deposition until completion. We report on the nucleation growth process of oxides on graphene, their resultant strain and their optical transmission.

Photoactivation of the processes of formation of nanostructures by local anodic oxidation of a titanium film

2010 ◽  
Vol 44 (13) ◽  
pp. 1703-1708 ◽  
Author(s):  
O. A. Ageev ◽  
N. I. Alyab’eva ◽  
B. G. Konoplev ◽  
V. V. Polyakov ◽  
V. A. Smirnov
Keyword(s):  
Anodic Oxidation ◽  
Titanium Film ◽  
Local Anodic Oxidation

Oxidation Of AI-Cu-Fe Quasicrystals

1998 ◽  
Vol 553 ◽  
Author(s):  
B. I. Wehner ◽  
U. Köster
Keyword(s):  
Oxide Layer ◽  
Oxidation Behavior ◽  
Copper Ions ◽  
High Growth ◽  
High Growth Rate ◽  
Protective Oxide ◽  
Temperature Oxidation ◽  
Concentration Changes ◽  
High Temperature Oxidation Behavior ◽  
In The Beginning

AbstractThe oxidation behavior of i-A163Cu25Fe12 at 800°C in air was investigated by means of TGA, XRD, SEM and TEM. In the beginning a homogeneous oxide layer is formed by the subsequent growth of metastable γ-Al2O3 and Θ-Al2O3. Nucleation of the thermodynamical stable α-Al2O3 occurs at the interface oxide/quasicrystal. The following growth of α-Al2O3 through the oxide layer leads to the formation of oxide nodules. The high growth rate of the α-Al2O3 can be explained by the incorporation of copper ions. The oxidation resistance of the quasicrystal is insufficient at high temperatures, because no protective oxide layer is formed. The high temperature oxidation behavior of Al-Cu-Fe quasicrystal and the aluminides β-FeAl and β-NiAl is compared regarding the oxidation rate, the oxide phases and the concentration changes in the material due to selective oxidation of aluminum.

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