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Toughening mechanisms in iron-containing hydroxyapatite/titanium composites
1Department of Mechanical and Industrial Engineering, Ryerson University, 350 Victoria Street, Toronto, Ontario M5B 2K3, Canada.
Biomaterials
|December 4, 2009
Summary
This study developed a novel iron-containing hydroxyapatite/titanium composite. The composite demonstrated enhanced mechanical properties, including improved fracture toughness and fatigue resistance, making it suitable for biomedical applications.
Area of Science:
- Biomaterials Science
- Materials Engineering
- Composite Materials
Background:
- Pure hydroxyapatite (HA) exhibits brittleness, limiting its use in load-bearing biomedical applications.
- Developing tougher HA-based composites is crucial for advancing orthopedic and dental implants.
Purpose of the Study:
- To develop a novel iron-containing hydroxyapatite/titanium (HA/Ti) composite.
- To investigate the toughening mechanisms in the developed composite via pressureless sintering.
- To evaluate the mechanical properties of the HA/Ti composite with varying iron content.
Main Methods:
- Pressureless sintering of HA/Ti composites with iron addition.
- Microstructural analysis to identify core/shell structures and interfacial bonding.
- Mechanical testing including flexural strength, fracture toughness, hardness, Young's modulus, and fatigue resistance.
Main Results:
- A core/shell microstructure of Ti-Fe particles with good HA matrix interfacial bonding was achieved.
- Increased Ti-Fe content led to reduced relative density, hardness, and Young's modulus.
- Significant improvements were observed in flexural strength, fracture toughness, and fatigue resistance with increasing Ti-Fe content.
Conclusions:
- The addition of iron to HA/Ti composites effectively enhances mechanical properties, particularly fracture toughness and fatigue resistance.
- Toughening mechanisms such as crack bridging, branching, and deflection contribute to improved crack propagation resistance.
- The developed iron-containing HA/Ti composite shows promise for load-bearing biomedical applications.
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