Investigation of annealing treatment on surface of porous NiTi alloy

Abd Kadir, Nur Amanina and Mohd Zaki, Hafizah Hanim and Zulfakar, Adibah Solehah and Razali, Muhammad Fauzinizam and Abdullah, Jamaluddin and Sarifuddin, Norshahida and Mohd Daud, Farah Diana (2024) Investigation of annealing treatment on surface of porous NiTi alloy. In: Advanced Materials Characterization Techniques 2022 (AMCT 2022), 23rd - 24th August 2022, Virtual Conference.

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Abstract

Porous Nickel-Titanium (NiTi) alloy has been developed especially in the biomedical sector due to its shape memory ability and its mechanical properties which is comparable to human bones. However, NiTi alloy carries the risk of Nickel (Ni) ions leaching when implanted in the human body making it less favourable for biomedical use for long term. Therefore, the goal of this research is to passivate the porous NiTi by oxidizing the surface via annealing treatment. Initially, the porous NiTi alloy was fabricated via powder metallurgy technique with addition of Calcium Hydride (CaH2) as a pore forming agent. Here, the degree of porosity was measured and the pore morphology, phase identification and transformation behavior were characterized by Scanning Electron Microscope (SEM), X-Ray Diffractometer (XRD), and Differential Scanning Calorimeter (DSC), respectively. Then, the surface treatment was performed by varying annealing temperatures where the oxide layer formation was characterized by using SEM and Energy Dispersive Spectrometer (EDS). The result shows that the sample's porosity increased by up to 42% from its theoretical density, demonstrating that the weight percentage of the pore-forming agent has a significant effect on the porosity of the NiTi alloy. For surface treatment, at higher annealing temperature i.e. 500°C, it produced a thicker oxide layer of TiO2 as compared to samples annealed at 300°C and 400°C. This indicates that the annealing temperature highly affects the formation of oxide layers on the surface. This oxide layer adheres well to the NiTi alloy surface and is expected to prevent the Ni ion from releasing, thus making this porous NiTi biocompatible metal.

Item Type:	Proceeding Paper (Plenary Papers)
Additional Information:	7612/119240
Subjects:	T Technology > T Technology (General)
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Engineering Kulliyyah of Engineering > Department of Manufacturing and Materials Engineering
Depositing User:	Dr Hafizah Hanim Mohd Zaki
Date Deposited:	10 Feb 2025 11:04
Last Modified:	10 Feb 2025 11:09
URI:	http://irep.iium.edu.my/id/eprint/119240

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