Study on surface modification by alkali and heat treatment in Ti alloys
Date Issued
2006
Date
2006
Author(s)
Feng, Guo-Jr
DOI
zh-TW
Abstract
The previously developed titanium-niobium alloys – Ti-40Nb-1Hf and Ti-30Nb-1Fe-1Hf alloys – exhibit relatively high strength and low elastic modulus and are considered quite suitable for implants application. This study employed alkali solution treatment and heat treatment to modify the surfaces of Ti-40Nb-1Hf and Ti-30Nb-1Fe-1Hf alloys together with the commercially pure Ti and Ti-6Al-4V alloy, and then the biocompatibility of the treated alloys was analyzed by means of osteoblast cell culture in vitro. The results indicate that porous surfaces were obtained for pure Ti and Ti-Al-4V, while surfaces with irregular cracks were obtained for Ti-40Nb-1Hf and Ti-30Nb-1Fe-1Hf alloys, after surface modification. Also, the surface wettability was improved after alkali solution treatment and heat treatment due to the increase of oxygen and hydroxyl on the surface layer. In addition, both alkali and heat treatments enhanced the growth of TiO2 on the surface layer of the commercially pure Ti and Ti-6Al-4V, and TiO2 and Nb2O5 for Ti-40Nb-1Hf and Ti-30Nb-1Fe-1Hf alloys. The formation of irregular cracks on the treated surfaces together with the increase in oxygen and hydroxyl, and TiO2 and Nb2O5 on the surface layer had been found to improve surface wettability and also the osteoblast attachment and proliferation of the surface-treated alloys. This has also been confirmed in vitro study, where the cell morphology, cell number and MTT optical assay of Ti-40Nb-1Hf and Ti-30Nb-1Fe-1Hf alloys are similar to those of pure Ti and Ti-6Al-4V alloy.
Subjects
鈦鈮合金
鹼性溶液及熱處理法
生物相容性
Titanium-niobium alloys
Alkali solution and heat treatment
Biocompatibility
Type
thesis
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