NDLI: Microstructural Analysis and Photocatalytic Activity of Plasma-Sprayed Titania-Hydroxyapatite Coatings

Content Provider	Springer Nature Link
Author	Ye, F. X. Ohmori, A. Tsumura, T. Nakata, K. Li, C. J.
Copyright Year	2007
Abstract	Hydroxyapatite (HAp Ca$_{10}$(PO$_{4}$)$_{6}$(OH)$_{2}$) is known to be a biomaterial and an adsorbent for chromatography. In this study, HAp was agglomerated with anatase TiO$_{2}$ to manufacture thermal-spray powders to improve the adsorption activity of TiO$_{2}$, and then to improve its photocatalytic activity. The microstructures, compositions and photocatalytic activity of plasma-sprayed TiO$_{2}$, TiO$_{2}$-10%HAp, TiO$_{2}$-30%HAp, and HAp coatings were investigated. Due to the low thermal conductivity of HAp compound, not all HAp particles fully melted even under the arc current of 800 A. The addition of HAp inhibited the phase transformation of anatase TiO$_{2}$ to rutile. Under the arc current of 600 A, the anatase content in the TiO$_{2}$, TiO$_{2}$-10%HAp and TiO$_{2}$-30%HAp coatings was 11, 20 and 42%, respectively. With the increasing of the spraying distance from 70 to 110 mm, the anatase content in the TiO$_{2}$-30%HAp coatings decreased from 34 to 17% under arc current of 700 A. Furthermore, a slight decomposition of HAp to α-Ca$_{3}$(PO$_{4}$)$_{2}$ was found in the TiO$_{2}$-30%HAp coatings, it did not decompose to CaO and P$_{2}$O$_{5}$ according to the XRD and EDAX analysis. The addition of the secondary gas of helium had no significant influence on the melting state of the TiO$_{2}$-HAp feedstock powders. Moreover, the HAp in the TiO$_{2}$-10%HAp and TiO$_{2}$-30%HAp coatings had adsorption characteristic to acetaldehyde. The photocatalytic activity of TiO$_{2}$-10%HAp coating was highest among TiO$_{2}$, TiO$_{2}$-10%HAp, and TiO$_{2}$-30%HAp coatings sprayed under the arc current of 600 A for the optimum adsorption property and anatase content.
Starting Page	776
Ending Page	782
Page Count	7
File Format	PDF
ISSN	10599630
Journal	Journal of Thermal Spray Technology
Volume Number	16
Issue Number	5-6
e-ISSN	15441016
Language	English
Publisher	Springer US
Publisher Date	2007-10-12
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	hydroxyapatite photocatalyst plasma spray TiO$_{2}$ Analytical Chemistry Operating Procedures, Materials Treatment Characterization and Evaluation of Materials Materials Science Tribology, Corrosion and Coatings Surfaces and Interfaces, Thin Films
Content Type	Text
Resource Type	Article
Subject	Surfaces, Coatings and Films Materials Chemistry Condensed Matter Physics

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