Development of a titanium alloy suitable for an optimized coating with hydroxyapatite

Area of Science:

• Biomaterials Science
• Metallurgical Engineering
• Materials Science

Background:

• Commercially pure titanium (Ti) has limitations in its thermal expansion coefficient (TEC) when used with hydroxyapatite (HA) for biomedical implants.
• Achieving strong adhesion between metallic substrates and HA coatings is crucial for implant longevity and osseointegration.

Purpose of the Study:

• To tailor the TEC of titanium by alloying to match that of hydroxyapatite (HA).
• To enhance the adhesion strength of HA coatings on a metallic material.
• To investigate the biocompatibility and mechanical properties of the developed alloy.

Main Methods:

• Metallurgical alloying method was employed to create titanium-manganese (Ti-Mn) alloys.
• The sol-gel process was utilized for hydroxyapatite (HA) precipitation onto the alloy.
• Characterization of thermal expansion coefficient, mechanical properties, and adhesion strength was performed.

Main Results:

• The TiMn6 alloy demonstrated a favorable compromise in TEC, mechanical properties, and biocompatibility.
• Coatings produced with TiMn6 exhibited extremely high adhesion strength to the metallic substrate.
• The sol-gel process for HA precipitation further enhanced coating adhesion, meeting theoretical requirements for thin coatings.

Conclusions:

• Alloying commercially pure titanium with manganese (TiMn6) effectively matches its TEC to that of hydroxyapatite (HA).
• The TiMn6 alloy, particularly with sol-gel derived HA coatings, offers superior adhesion strength for biomedical applications.
• This tailored composite material shows promise for enhanced implant performance and osseointegration.