日本金属学会誌

J. Japan Inst. Metals, Vol. 69, No. 8 (2005),
pp. 684-690

Hydroxyapatite Dispersed Glass Coatings on Co-Cr Implant Alloys

Hirofumi Tokunaga1, and Shigeru Fujino2

1Depertment of Applied Science for Electronics and Materials, Kyushu University, Kasuga 816-8580
2Depertment of Engineering Sciences for Electrons and Materials, Kyushu University, Kasuga 816-8580

Abstract:

Hydroxyapatite dispersed glass coatings on VitalliumR, a cobalt-chromium alloy were prepared using a simple enameling technique. The composition of the bioinert glasses in the SiO2-B2O3-Na2O-K2O-MgO-Al2O3-ZrO2-TiO2 system has been tailored to match the thermal expansion of the alloys. The optimum glass composition and firing conditions (temperature and time) needed to fabricate homogeneous coatings with good adhesion to the alloy were determined. The final coating thickness ranged between 40 to 60 μm. Coatings fired under the optimum conditions do not delaminate during indentation tests of adhesion. Excellent adhesion to the alloy has been achieved through the formation of 200 nm thick interfacial layers (CrOx). X-ray diffraction patterns for the hydroxyapatite dispersed on the glass surface showed a strong preferred orientation of the (0 0 2) plane when immersed in a simulated body fluid (SBF).


(Received 2005/3/22)

Keywords:

glass, bioactivity, cobalt-chromium alloy, hydroxyapatite, simulated body fluid, bonding strength


PDF(Free)PDF (Free)     Table of ContentsTable of Contents

Please do not copy without permission.