title: Bond-coating in plasma-sprayed calcium-phosphate coatings.
abstract: The influence of bond-coating on the mechanical properties of plasma-spray coatings of hydroxyatite on Ti was investigated. Plasma-spray powder was produced from human teeth enamel and dentine. Before processing the main apatite coating, a very thin layer of Al2O3/TiO2 was applied on super clean and roughened, by Al2O3 blasting, Ti surface as bond-coating. The experimental results showed that bond-coating caused significant increase of the mechanical properties of the coating layer: In the case of the enamel powder from 6.66 MPa of the simple coating to 9.71 MPa for the bond-coating and in the case of the dentine powder from 6.27 MPa to 7.84 MPa, respectively. Both tooth derived powders feature high thermal stability likely due to their relatively high content of fluorine. Therefore, F-rich apatites, such those investigated in this study, emerge themselves as superior candidate materials for calcium phosphate coatings of producing medical devices. The methods of apatite powder production and shaping optimization of powder particles are both key factors of a successful coating. The methods used in this study can be adopted as handy, inexpensive and reliable ways to produce high quality of powders for plasma spray purposes.
authors.affiliation: Department of Industrial Engineering, School of Engineering, Marmara University, Goztepe Campus, Ziverbey, 34722, Kadikoy, Istanbul, Turkey. foktar@eng.marmara.edu.tr
authors.forename: F N
authors.initials: FN
authors.lastname: Oktar
authors.forename: M
authors.initials: M
authors.lastname: Yetmez
authors.forename: S
authors.initials: S
authors.lastname: Agathopoulos
authors.forename: T M
authors.initials: TM
authors.lastname: Lopez Goerne
authors.forename: G
authors.initials: G
authors.lastname: Goller
authors.forename: I
authors.initials: I
authors.lastname: Peker
authors.forename: I
authors.initials: I
authors.lastname: Ipeker
authors.forename: J M F
authors.initials: JM
authors.lastname: Ferreira
mesh_terms: D001031:Apatites / Q000737:chemistry; D002130:Calcium Phosphates / Q000737:chemistry*; D002516:Ceramics / Q000737:chemistry; D020099:Coated Materials, Biocompatible; D003743:Dental Enamel / Q000737:chemistry; D003804:Dentin / Q000737:chemistry; D006801:Humans; D011208:Powders; D012212:Rheology; D014025:Titanium
chemical_list: D001031:Apatites; D002130:Calcium Phosphates; D020099:Coated Materials, Biocompatible; D011208:Powders; C020243:calcium phosphate; D014025:Titanium