AVS 50th International Symposium
    Biomaterial Interfaces Wednesday Sessions
       Session BI-WeP

Paper BI-WeP16
Bioactivity of Titanium Coatings Prepared by Reactive Plasma Spraying

Wednesday, November 5, 2003, 11:00 am, Room Hall A-C

Session: Poster Session
Presenter: M. Inagaki, National Institute of Advanced Industrial Science and Technology (AIST), Japan
Authors: M. Inagaki, National Institute of Advanced Industrial Science and Technology (AIST), Japan
Y. Yokogawa, National Institute of Advanced Industrial Science and Technology (AIST), Japan
T. Kameyama, National Institute of Advanced Industrial Science and Technology (AIST), Japan
Correspondent: Click to Email
A simple treatment method using radio-frequency reactive plasma spraying (rf-RPS) was studied to induce bioactivity of titanium (Ti) coatings. Ti coatings were deposited on Ti substrates by a rf-RPS method using a thermal plasma of Ar gas containing 1-6% N@sub 2@ and/or O@sub 2@ at a input power of 16 kW. Ti powders impregnated with calcium were also sprayed. Composition change of coating's surface during soaked in a simulated body fluid (SBF)@footnote 1@ was examined by micro Fourier transform infrared spectroscopy and thin film X-ray diffraction. Ti coatings prepared with Ar-O@sub 2@ and Ar-N@sub 2@-O@sub 2@ plasma formed apatite after 3 days of soaking in 40 ml SBF. This indicates that such coatings have the ability to form a biologically active bone-like apatite layer on the surface. In the XRD patterns for both Ti coatings, minute peaks ascribable to TiO@sub 2@ (anatase and rutile phase) were commonly observed. On the other hand, composition change of coating's surface cannot be observed for Ti coating sprayed with pure Ar and Ar-N@sub 2@ plasma after 7 days of soaking in SBF. The 0.05-0.2 mol% impregnated Ti coatings prepared with Ar-O@sub 2@ and Ar-N@sub 2@-O@sub 2@ plasma formed apatite after 7 days of soaking in SBF. Thus it seems that calcium impregnation into Ti powders somewhat inhibited to form apatite at surface of coatings. Ti coatings with Ar-N@sub 2@-O@sub 2@ plasma gave excellent adhesion to substrate, whereas Ti coatings with Ar-O@sub 2@ plasma gave poor adhesion. Therefore, surface modification of Ti splat by Ar-N@sub 2@-O@sub 2@ plasma is an effective method to provide excellent adhesion and bioactivity for plasma sprayed Ti coatings. @FootnoteText@ @footnote 1@HM Kim, F. Miyaji, T Kokubo, T Nakamura, J. Biomed. Mater. Res 45, (1999)100-107.