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Sequential elucidation of the β-Ca3(PO4)2/TiO2 composite development from the solution precursors
1Centre for Nanoscience and Technology, Pondicherry University, Puducherry-605 014, India. para_kanna@yahoo.com.
Dalton Transactions (Cambridge, England : 2003)
|February 23, 2017
Summary
This study details the synthesis of beta-tricalcium phosphate/titanium dioxide (β-Ca3(PO4)2/TiO2) composites. Adding TiO2 enhances the density and mechanical properties of the resulting β-Ca3(PO4)2/rutile TiO2 composites.
Area of Science:
- Materials Science
- Ceramics Engineering
- Biomaterials
Background:
- Beta-tricalcium phosphate (β-Ca3(PO4)2) is a bioceramic with potential applications in bone regeneration.
- Titanium dioxide (TiO2) is a widely studied ceramic known for its photocatalytic and mechanical properties.
- Composite materials offer synergistic properties not achievable by individual components.
Purpose of the Study:
- To investigate the sequential formation and phase evolution of β-Ca3(PO4)2/TiO2 composites synthesized from solution precursors.
- To understand the effect of TiO2 on the structural stability and microstructure of β-Ca3(PO4)2.
- To evaluate the influence of TiO2 content on the mechanical properties of the composites.
Main Methods:
- Solution precursor synthesis followed by controlled heat treatments.
- Phase evolution analysis using various analytical techniques (e.g., X-ray diffraction).
- Microstructural characterization and mechanical property evaluation via nanoindentation.
Main Results:
- Initial formation of apatite and anatase TiO2 (a-TiO2) below 800 °C.
- Crystallization of β-Ca3(PO4)2 at ~800 °C and its stability up to 1300 °C.
- Phase transition of a-TiO2 to rutile TiO2 (r-TiO2) between 800-1100 °C.
- Incorporation of Ti4+ into β-Ca3(PO4)2 lattice delayed the β- to α-Ca3(PO4)2 conversion.
- TiO2 addition resulted in dense, pore-free microstructures and improved mechanical properties.
Conclusions:
- The synthesis route enables controlled formation of β-Ca3(PO4)2/r-TiO2 composites.
- TiO2 incorporation enhances the densification and mechanical strength of β-Ca3(PO4)2.
- These composites show promise for applications requiring enhanced mechanical performance.
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