Fabrication And Characterizations Of Hydroxyapatite (HA) / Chitosan (CTS) Composite Layer Onto Titanium Alloy (Ti-6AL-4V) Substrate

Md Afindi, Muhammad (2013) Fabrication And Characterizations Of Hydroxyapatite (HA) / Chitosan (CTS) Composite Layer Onto Titanium Alloy (Ti-6AL-4V) Substrate. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Ti-6Al-4V is preferred as material in the production of implants because it possesses favorable properties, such as relatively low modulus, low density, and high strength. Unfortunately, it has poor bioactive properties and fails to bond to bone tissue. The pure HA coating on the Ti-6Al-4V, improves the surface bioactivity but often flakes off as a result of poor HA/Ti-6Al-4V interface bonding, which may cause the surgery to fail. One way to improve the low strength of pure HA coatings is to form a composite coating by reinforce HA coating with CTS. In this study, HA/CTS composite were produced with the composition of CTS is (30 wt.% CTS) by powder metallurgy method. The study is focusing on identifying the effect of temperatures on HA/CTS composite layer onto Titanium Alloy (Ti-6Al-4V) substrate. The substrate were sintered under flowing high temperature furnace in Argon gas atmosphere at four different temperatures for 750 °C, 800 °C, 850 °C and 900 °C. The effect of different temperatures onto composite layer has improved its hardness properties were characterized by Vickers Microhardness. Meanwhile, the verification of phase composition and chemical analysis were conducted by XRD, SEM and EDX. In addition, the biocompatibility of the alloy was remarkably improved by the HA coating and the incorporation of CTS into the coating. At 900 °C was selected as the best temperature due to the good results obtained from XRD, SEM and EDX analysis and mechanical testing such as Vickers Microhardness.

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