Blast coating method: new method of coating titanium surface with hydroxyapatite at room temperature

Area of Science:

• Biomaterials Science
• Materials Engineering
• Surface Science

Background:

• Titanium is a common material for hard tissue replacement.
• Hydroxyapatite (HAP) is a key component of bone and is widely used in bone regeneration.
• Current methods for coating titanium with HAP often lack sufficient bonding strength.

Purpose of the Study:

• To investigate a novel room-temperature blast coating method for applying hydroxyapatite (HAP) onto titanium surfaces.
• To evaluate the homogeneity, composition, structure, and adhesion of the HAP coating.
• To compare the bonding strength of this method with existing room-temperature coating techniques.

Main Methods:

• Titanium plates were blasted with hydroxyapatite (HAP) powder using a sandblaster at room temperature.
• Coated surfaces were analyzed using energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD).
• Scanning electron microscopy (SEM) was used to assess coating adhesion.
• Ultrasonication and nail scratching tests were performed to evaluate coating stability and bonding strength.

Main Results:

• Homogeneous and complete HAP coating on titanium surfaces was achieved.
• The coated HAP layer exhibited the same composition and crystallographic structure as the original HAP powder.
• The HAP coating demonstrated strong adhesion to the titanium substrate, resisting removal by ultrasonication and scratching.
• The bonding strength was significantly higher than that achieved with dipping, electrophoretic, or electrochemical deposition methods.

Conclusions:

• Room-temperature sandblasting is an effective method for creating robust hydroxyapatite (HAP) coatings on titanium.
• The blast coating method offers superior adhesion and stability compared to conventional techniques.
• This technique shows significant potential for fabricating advanced biomaterials for hard tissue replacement applications.