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3911 |
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Comparison of plasma spraying hollow and solid spherical hydroxyapatite particles |
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Fatih Erdem Bastan* / Sakarya University, Engineering Faculty, Department of Metallurgy and Materials Engineering, Thermal Spray Research and Development Laboratory, , Turkey Gencer Agtas / Sakarya University, Engineering Faculty, Department of Metallurgy and Materials Engineering, Thermal Spray Research and Development Laboratory, TURKEY Aydin Karabulut/ Sakarya University, Engineering Faculty, Department of Metallurgy and Materials Engineering, Thermal Spray Research and Development Laboratory, TURKEY Garip Erdogan/ Sakarya University, Engineering Faculty, Department of Metallurgy and Materials Engineering, Thermal Spray Research and Development Laboratory, TURKEY Murat Cihan Caliskan/ Sakarya University, Engineering Faculty, Department of Metallurgy and Materials Engineering, Thermal Spray Research and Development Laboratory, TURKEY Fatih Ustel/ Sakarya University, Engineering Faculty, Department of Metallurgy and Materials Engineering, Thermal Spray Research and Development Laboratory, TURKEY |
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Hydroxyapatite is the main mineral of human bone, teeth and it has excellent biocompatibility, bioactivity and osteoconductivity. Many coating technology has been implemented to produce HA coating on metallic implant materials. Plasma spraying is the most common and wide technique used commercially. The nature of high temperatures of plasma spraying, hydroxyapatite decomposes and degrades into different calcium phosphates and shows some amorphous phase structure over coating structure. Using different particles form will change the particle temperature while change and it effects the coating phase composition. Therefore, chemically precipitated hydroxyapatite mineral was granulated to form spherical and hollow hydroxyapatite particles by spray drying method to use as plasma spray feedstock powder. PVA (Polyvinyl Alcohol) was used to as a binder material to hydroxyapatite slurry. After producing and granulating the hydroxyapatite powders, the effect of particle forms on the coating structures was investigated. The coatings were produced by F4 MB plasma gun and particles speed and temperature was measured as well. Phase compositions, coating morphologies, hardness, porosity and the degree of crystallinity were examined in this study. |