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Bioactivity of plasma sprayed dicalcium silicate coatings
Xuanyong Liu1, Shunyan Tao, Chuanxian Ding
1Shanghai Institute of Ceramics, Chinese Academy of Sciences, People's Republic of China. lxyong@citiz.net
Biomaterials
|January 5, 2002
Summary
Plasma-sprayed dicalcium silicate coatings on titanium alloys show excellent bioactivity. A dense apatite layer forms rapidly in simulated body fluid, indicating strong potential for bone regeneration applications.
Area of Science:
- Biomaterials Science
- Materials Engineering
- Surface Chemistry
Background:
- Titanium alloys are widely used in biomedical implants due to their excellent mechanical properties.
- Enhancing the bioactivity of titanium implants is crucial for improving osseointegration and long-term success.
- Dicalcium silicate (Ca2SiO4) is a promising bioactive material for biomedical coatings.
Purpose of the Study:
- To investigate the bioactivity of plasma-sprayed dicalcium silicate coatings on titanium alloy substrates.
- To analyze the apatite nucleation and growth on the coating surface when immersed in simulated body fluid (SBF).
- To evaluate the structural and morphological changes of the coating after SBF immersion.
Main Methods:
- Plasma spraying was used to deposit dicalcium silicate coatings onto titanium alloy substrates.
- Specimens were immersed in simulated body fluid (SBF) for varying durations.
- X-ray Diffraction (XRD) and Infrared (IR) spectroscopy were employed for surface structural analysis.
- Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Spectroscopy (EDS) were used for surface morphology and elemental composition analysis.
Main Results:
- The plasma-sprayed dicalcium silicate coating exhibited strong adhesion to the titanium substrate.
- The coating primarily consisted of beta-Ca2SiO4 (dicalcium silicate) and a glassy phase.
- A dense, carbonate-containing hydroxyapatite (CHA) layer rapidly formed on the coating surface within 2 days of SBF immersion.
- A silica-rich layer was observed between the CHA layer and the dicalcium silicate coating.
- The CHA layer thickness increased with prolonged immersion time.
Conclusions:
- Plasma-sprayed dicalcium silicate coatings demonstrate excellent bioactivity.
- The rapid formation of a CHA layer in SBF indicates good potential for promoting bone apposition.
- These coatings are promising candidates for enhancing the osseointegration of titanium-based implants.