| Plasma Sprayed Hydroxyapatite Bioceramic Coatings from
Coprecipitation Synthesized Powder: Preparation,
Characterization and in vitro Studies |
Singanahalli Thippa Reddy Aruna,1,* Muddarama Shilpa,1 Ramachandrappa Vara Lakshmi,1
Narayanaswamy Balaji,1 Varadharajan Kavitha2 and Arumugam Gnanamani2
Pages : 90-99
DOI : 10.1080/0371750X.2018.1465358 |
| Abstract |
| Plasma spraying is the most recommended spraying methodology for coating of
biomedical alloys by Food and Drug Administration and the process requires
flowable powders. In the present study, plasma sprayable grade hydroxyapatite
(HAp) powder has been prepared by a single step co-precipitation technique using
mixture of precipitating agents and thereby avoiding agglomeration processes
like spray drying. HAp coating has been deposited on Ti-6Al-4V substrate using
atmospheric air plasma spraying system to get a coating thickness of ~100 m.
The synthesized powder and plasma sprayed coating exhibit crystallinity of
12% and 56%, respectively. The powder possesses good flowability and shows
an average agglomerated particle size of 87 m. The coating consists of fully
melted regions and unmelted/partially melted regions. Biocompatibility studies
carried out under in vitro conditions using 3T3 fibroblast cells indicate the
non-toxic nature of coatings and supports adherence and growth of the cells.
Plasma sprayed HAp coating exhibits lower coefficient of friction than that of the
substrate. A detailed electrochemical study of the plasma sprayed HAp coatings
in Hanks’ medium has also been reported. The plasma sprayed HAp coating
synthesized from solid state synthesized powder is porous and does not possess
proper adhesion to the substrate. |
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