日本金属学会誌

J. Japan Inst. Metals, Vol. 67, No. 10 (2003),
pp. 604-613

Aging Characteristics and Mechanical Properties of Ti-29Nb-13Ta-4.6Zr Coated with Calcium Phosphate Invert Glass-Ceramic for Biomedical Applications

Mitsuo Niinomi1, Toshikazu Akahori1, Tomohiro Yamaguchi1,, Toshihiro Kasuga2, Hisao Fukui3 and Akihiro Suzuki4

1Department of Production Systems Engineering, Toyohashi University of Technology, Toyohashi 441-8580
2Department of Materials Science and Engineering Nagoya Institute of Technology, Nagoya 466-8555

3School of Dentistry, Aichi-Gakuin University, Nagoya 464-8650

4R&D Laboratory, Daido Steel Co., LTD., Nagoya 457-8584

Abstract:

Aging characteristics and mechanical properties of biomedical β type titanium alloy, Ti-29Nb-13Ta-4.6Zr, coated with calcium phosphate invert glass-ceramic were investigated.

Vickers hardness values of cross sections of Ti-29Nb-13Ta-4.6Zr, TNTZ, prepared for dip-coating treatment, DCT, composed of a firing treatment, FT, at 1073 K for 0.9 ks or 3.6 ks followed by furnace cooling and conducted with only FT are almost the same, and are around 240 Hv. This value is much higher than that of TNTZ prepared for solution treatment, ST, at 1063 K for 3.6 ks. The increasing hardness is due to the precipitation of ω phases in the matrix, β phase, during FT. Tensile bonding strength of 5 μm thick coating layer of calcium phosphate invert glass-ceramic on TNTZ is not degraded by aging, but 20 μm thick coating layer is degraded. The modulus of elasticity of TNTZ prepared for DCT or aging after DCT is relatively higher than that of TNTZ prepared for ST, that is, around 80 GPa and 110 GPa, respectively.


(Received June 30, 2003)

Keywords:

biomaterial, β type titanium alloy, titanium-29 mass%niobium-13 mass%tantlum-4.6zirconium, bioactive surface coating, microstructure, aging treatment, tensile properties and tensile bonding strength


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