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Fabrication and Properties of Ti-HA Composites Produced by Pulsed Current Activated Sintering for Biomaterials  

Woo, Kee Do (Division of Advanced Materials Engineering & Research Center of Industrial Technology, Chonbuk National University)
Kang, Duck Soo (Division of Advanced Materials Engineering & Research Center of Industrial Technology, Chonbuk National University)
Kwon, Eui Pyo (Division of Advanced Materials Engineering & Research Center of Industrial Technology, Chonbuk National University)
Moon, Min Seok (Department of Hydrogen and Fuel Cells Engineering, Specialized Graduate School, Chonbuk National University)
Shon, In Jin (Division of Advanced Materials Engineering & Research Center of Industrial Technology, Chonbuk National University)
Liu, Zhiguang (School of Materials Science and Engineering, Harbin Institute of Technology)
Publication Information
Korean Journal of Metals and Materials / v.47, no.8, 2009 , pp. 508-515 More about this Journal
Abstract
Ti-6Al-4V biomaterial is widely used as a bone alternative. However, Ti-6Al-4V ELI alloy suffers from numerous problems such as a high elastic modulus and high toxicity. Therefore, non-toxic biomaterials with low elastic moduli need to be developed. Ti-HA(hydroxyapatite) composites were fabricated in the present work by pulsed current activated sintering (PCAS) at $1000^{\circ}C$ under 60 MPa using mixed Ti and HA powders. The effects of HA content on the physical and mechanical properties of the sintered Ti-HA composites have been investigated. X-ray diffraction(XRD) analysis of the Ti-HA composites, including Ti-40 wt%HA in particular, revealed new phases, $Ti_{2}O$, CaO, $CaTiO_3$, and TixPy, formed by chemical reactions between Ti and HA during sintering. The hardness of the Ti-HA composites decreased with an increase in HA content. The corrosion resistance of these composites was observed to be an excellent candidate as a commercial Ti-6Al-4 V ELI alloy. A Ti-5 wt%HA composite fabricated by PCAS is recommended as a new biomaterial, because it offers good corrosion resistance, compressive strength, wear resistance, and biocompatibility, and a low Young's modulus.
Keywords
biomaterial; Ti-HA composite; powder metallurgy; PCAS; hydoxyapatite;
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