| dc.description.abstract | Micro Arc Oxidation (MAO) is used in many areas in the biomedical
applications (medicine, dentistry), automotive, military, textile industry,
maritime industry, aircraft and space sectors because it creates high
temperature resistant coatings and shows high di-electric properties. Due to
this feature, it is especially important in the space industry in the production
of protective coatings of missiles and space shuttles. In addition, MAO
technology is used in chemical applications because it is resistant not only to
high temperatures but also to medium temperatures and strong acids and
bases; In mechanical applications as a factor that increases wear resistance
due to its high oxide hardness (> 1300 kg/mm2) layer; It is a surface
modification process that can be used in thermal and electrical-electronic
applications (Sun et al., 2005, Günyüz, 2007, Mostofizadeh et al., 2011)
Compared to anodic oxidation, MAO technology is superior with its
higher coating formation rate and thickness due to the ability to reach higher
voltages. MAO technology is a superior process to the plasma spraying
method with its high adhesion force that develops with the substrate material.
When compared to the hard chrome plating method in terms of the
electrolytes used, it is seen that the alkaline electrolytes used in the MAO
process are not harmful to the environment. In short, the MAO process is seen
as a technology that continues to develop, provides high tribological
properties, and will replace many of the traditional coatings with its advanced
surface treatment method (Lee et al., 2008, Morks et al., 2011, Malayoglu et
al., 2011).
An ideal metallic biomaterial used in dentistry and orthopedic fields;
It is required to have biocompatibility, relatively low density, contain little or
no toxic metals in its structure, have high strength and long fatigue life, low
elastic modulus (compared to cortical bone), plasticity at wide ambient
temperatures and be perfect. Titanium and its alloys are shiny and have a high
specific strength (strength/density) ratio. Titanium and its alloys are widely
used in dental and orthopedic applications due to their excellent
biocompatibility, mechanical properties, excellent corrosion resistance and
ease of machinability (Rautray et al., 2011). Biocompatibility is the ability of
a material to perform its function in the presence of the appropriate
environment for a specific application. The materials used as implants are
expected to be highly non-toxic and should not cause any inflammation or
105 | Current Research From Science to Technology
allergic reactions in the human body (Geetha et al., 2009). The success of
biomaterials depends mainly on the reaction of the living body towards the
implant material. Due to the presence of a passive and stable thin oxide film
(TiO2) formed on the surface of titanium, it is relatively inert, has high
corrosion resistance and superior biocompatibility. Since the oxide layer on
the titanium surface is homogeneous and dense, the titanium implant does not
interact with tissues and also regenerates immediately if the passive layer is
damaged (Liu, et al., 2004).
The surfaces of titanium and its alloys play an important role in
implant integration in the living body. As a result of different surface
modifications, the properties specified in the following items can be achieved.
•Better mechanical fixation of the implant to the bone tissue
(improvement of bone bonding with the implant)
•Improvement of bone permeability and inductivity
•Improving wear resistance
•Improving corrosion resistance
•Improvement of biocompatibility and bioactivity
•Shortening recovery time after implantation
In this article, the parameters of the micro arc oxidation process and
biocompatibility are examined. | tr |
