Effect of Alkali and Heat Treatment on Biomimetic HA Coating on Ti6Al4V

Document Type : Research Article

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Abstract

In this study, time of calcium phosphate formation on Ti6Al4V alloy with or without alkali and heat treatments was investigated. Specimens were soaked in 0, 5, 10 M solutions of NaOH at temperatures of 60 or 80 °C for 24, 72 h. Their surfaces were characterized using scanning electron microscopy and thin film X-ray diffraction. It was found that optimum condition is 72h soaking in 5 M NaOH in 80 °C. Specimens treated under these optimum conditions were subsequently heat-treated at 500, 600, and 700 °C for 1h in order to consolidate the sodium titanate hydrogel layer. With heat treatment at 600 °C for 1h and then soaking in simulated body fluid (SBF), apatite formed within 3 days. But there were no signs of apatite formation in control samples (without alkali and heat treatment) up to 7 days soaking in SBF. So, it was concluded that alkali-heat treatment is an effective way for accelerating apatite formation and the optimum condition is 72 h soaking in 5 M NaOH solution at 80°C and then heat treatment at 600 °C resulted for 1 h.

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References

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AUT Journal of Modeling and Simulation
Volume 41, Issue 2 - Serial Number 2
November 2009
Pages 59-63

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