Laser cladding of bioactive glass coatings

Area of Science:

• Biomaterials Science
• Materials Engineering
• Surface Science

Background:

• Titanium alloys (Ti6Al4V) are widely used in biomedical implants due to their excellent mechanical properties.
• Developing bioactive coatings on titanium is crucial for enhancing osseointegration and implant longevity.
• Traditional bioactive glasses like 45S5 Bioglass can present challenges in uniform coating deposition.

Purpose of the Study:

• To investigate the efficacy of laser cladding with powder injection for producing bioactive glass coatings on Ti6Al4V.
• To evaluate alternative bioactive glass compositions for improved coating homogeneity.
• To assess the bioactivity and structural integrity of the resulting coatings.

Main Methods:

• Laser cladding using powder injection with a Nd:YAG laser.
• Utilized S520 bioactive glass as a precursor material, exploring its wetting angle-temperature behavior.
• Characterized coating composition, microstructure, and surface properties.
• Assessed bioactivity through immersion in simulated body fluid (SBF).

Main Results:

• S520 bioactive glass demonstrated a gradual wetting angle-temperature evolution, leading to homogeneous coating deposition.
• Coatings exhibited calcium silicate crystallization on the surface and uniform composition throughout the cross-section.
• No significant dilution of the underlying Ti6Al4V substrate was observed.
• The produced coatings maintained bioactivity comparable to the precursor material.

Conclusions:

• Laser cladding with S520 bioactive glass is an effective method for creating homogeneous, bioactive coatings on Ti6Al4V.
• The developed coatings show potential for improving the performance of titanium-based biomedical implants.
• This technique offers a viable route for enhancing the biological response of metallic implants.