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Bioactive glass coatings with hydroxyapatite and Bioglass particles on Ti-based implants. 1. Processing
J M Gomez-Vega1, E Saiz, A P Tomsia
1Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
Biomaterials
|January 13, 2000
Summary
Silicate-based glass coatings were developed for Ti6A14V implants using enameling. Bioactive particles like Bioglass or hydroxyapatite were embedded, creating strong bonds for durable, stress-resistant implants.
Area of Science:
- Biomaterials Engineering
- Materials Science
Background:
- Titanium alloys (Ti6A14V) are widely used in implants due to their mechanical properties.
- Enhancing the bioactivity and osseointegration of titanium implants is crucial for long-term success.
- Developing reliable coating methods that ensure strong adhesion and durability is essential.
Purpose of the Study:
- To prepare silicate-based glass coatings for Ti6A14V with matched thermal expansion coefficients.
- To embed bioactive particles, specifically Bioglass (BG) or hydroxyapatite (HA), onto these coatings to improve bioactivity.
- To evaluate the adhesion, bioactivity, and mechanical stability of the resulting coated implants.
Main Methods:
- Silicate-based glasses with thermal expansion coefficients matching Ti6A14V were synthesized.
- A simple enameling technique was employed to coat Ti6A14V substrates.
- Bioglass (BG) or hydroxyapatite (HA) particles were embedded into the glass coatings during heat treatment (800-840°C).
- Coating integrity and adhesion were assessed using Vickers indentation tests.
Main Results:
- Strong adhesion was achieved between the glass coating and the Ti6A14V substrate.
- Hydroxyapatite particles were firmly embedded with no interfacial reaction observed.
- Bioglass particles showed some infiltration into the glass coating, requiring specific particle sizes (>45 microm) to prevent hollowness.
- Coating integrity was maintained up to 20% particle surface coverage; higher concentrations led to cracking.
- Vickers indentation tests confirmed strong particle/glass and glass/metal interfaces, with no crack propagation along these boundaries.
Conclusions:
- Enameling is a promising technique for creating bioactive coatings on Ti6A14V.
- The developed coatings exhibit excellent glass/metal adhesion and securely attached bioactive particles.
- These reliable and lasting implants can withstand significant chemical and mechanical stresses, indicating potential for enhanced in vivo performance.