Fatigue characteristics of bioactive glass-ceramic-coated Ti-29Nb-13Ta-4.6Zr for biomedical application.

Abstract

A new surface-coating method by which CaP invert glass is used to improve the bioactivity of titanium alloys has been developed recently. In this method, the powder of CaP invert glass (CaO-P2O5-TiO2-Na2O) is coated on the surface of titanium alloy samples and heated between 1073 and 1123 K. With this treatment, a calcium phosphate layer mainly containing beta-Ca3(PO4)2 phase can be coated easily on titanium alloy samples. In the present study, the effect of this coating process on the fatigue properties of Ti-29Nb-13Ta-4.6Zr, a new metastable beta alloy for biomedical applications, has been investigated. The fatigue endurance limit of the coated alloy was found to be about 15% higher than that of uncoated alloy, as a result of the formation of a hard (alpha + beta) layer and a small amount of the omega phase during the coating process. The coating exhibits excellent adhesion to the substrate during the tensile and fatigue tests. Subsequent ageing at 673 K for 259.2 ks greatly improves the fatigue resistance of the coated alloy due to isothermal omega phase precipitation, and does not have obvious detrimental effect on the coating properties.

• Authors: S J Li, M Niinomi, T Akahori, T Kasuga, R Yang, Y L Hao
• Journal: Biomaterials (Biomaterials) Vol. 25 Issue 17 Pg. 3369-78 (Aug 2004) ISSN: 0142-9612 [Print] Netherlands
• PMID: 15020109 (Publication Type: Evaluation Study, Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Coated Materials, Biocompatible
• Ti-29Nb-13Ta-4.6Zr alloy
• cap invert glass
• Niobium
• Tantalum
• Zirconium
• Titanium

Topics

• Adhesiveness
• Adsorption
• Biomedical Technology (methods)
• Coated Materials, Biocompatible (chemistry)
• Compressive Strength
• Materials Testing
• Niobium (chemistry)
• Prostheses and Implants
• Surface Properties
• Tantalum (chemistry)
• Tensile Strength
• Titanium (chemistry)
• Zirconium (chemistry)