Processing of Ti50Nb50-xHAx composites by rapid microwave sintering technique for biomedical applications
File(s)
Published version
Author(s)
Type
Journal Article
Abstract
The main objective of this research is to fabricate porous mechanical-tuned (low elastic modulus and high strength) Ti-based composites with improved bioactivity for orthopaedic applications. Another objective is to demonstrate the potential of microwave sintering and temporary space alloying technique to synthesize porous Ti-based composites. In this study, porous Ti50Nb50−xHAx (x = 0, 10 and 20) composite was fabricated for orthopaedic applications using a powder metallurgical and rapid microwave sintering (PM-RMS) process. Effects of key PM-RMS parameters on the structural porosity, compressive strength, and elastic modulus of built composite were then analysed. The microstructure, pore characteristics, and mechanical properties were investigated in detail. Using high hydroxyapatite (HA) content (20%), short sintering time (5 min), and high compacting pressure (200 MPa) appears to be the best condition among those studied in terms of yielding a high degree of structural porosity (21%) and low elastic modulus (25 GPa) in the sintered composite. Since size of pores in the synthesized composite is in the range of 20–30 μm, structural porosity not only reduces elastic modulus but also enhances bio-activity of sintered composite. The combination of highly porous structure, low elastic modulus, high compressive strength, improved corrosion resistance, and enhanced bioactivity makes porous Ti-Nb-HA composites fabricated by microwave sintering process potential and promising candidates for orthopedic applications.
Date Issued
2020-01
Date Acceptance
2019-10-21
Citation
Journal of Materials Research and Technology, 2020, 9 (1), pp.242-252
ISSN
2238-7854
Publisher
Elsevier
Start Page
242
End Page
252
Journal / Book Title
Journal of Materials Research and Technology
Volume
9
Issue
1
Copyright Statement
Crown Copyright ©2019 Published by Elsevier B.V. This is an open access article under the CCBY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Identifier
https://www.sciencedirect.com/science/article/pii/S2238785419312529?via%3Dihub
Subjects
Science & Technology
Technology
Materials Science, Multidisciplinary
Metallurgy & Metallurgical Engineering
Materials Science
Orthopaedic implants
Porous Ti(50)Nb(50-x)HA(x) composite
Rapid microwave sintering
Porosity
Compressive strength
Elastic modulus
SHAPE-MEMORY ALLOY
BIOACTIVE SURFACE MODIFICATION
MECHANICAL-PROPERTIES
IN-VITRO
HA COMPOSITE
MICROSTRUCTURE
POWDER
CORROSION
IMPLANTS
OPTIMIZATION
Publication Status
Published
Date Publish Online
2019-11-06