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Related Experiment Videos

Plasma-sprayed hydroxyapatite+titania composite bond coat for hydroxyapatite coating on titanium substrate.

Yu-Peng Lu1, Mu-Sen Li, Shi-Tong Li

  • 1School of Materials Science and Engineering, Shandong University, No. 73 Jingshi Road, Ji Nan, Shandong, 250062, China. biosdu@sdu.edu.cn

Biomaterials
|March 30, 2004
PubMed
Summary

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A novel two-layer hydroxyapatite (HA)/HA+TiO(2) composite coating on titanium was developed. Heat treatment improved HA structural integrity and coating adhesion, reducing residual stress for enhanced implant performance.

Area of Science:

  • Biomaterials Science
  • Materials Engineering
  • Surface Science

Background:

  • Titanium implants are widely used in orthopedics and dentistry.
  • Hydroxyapatite (HA) coatings enhance osseointegration but can suffer from poor adhesion and cracking.
  • Incorporating TiO(2) into HA coatings may improve mechanical properties and thermal stability.

Purpose of the Study:

  • To fabricate and characterize a two-layer hydroxyapatite (HA)/HA+TiO(2) composite coating on titanium via plasma spraying.
  • To investigate the effects of heat treatment on the microstructure, phase composition, and interfacial bonding of the composite coating.
  • To evaluate the residual stress and toughening mechanisms within the composite coating system.

Main Methods:

  • Plasma spraying was used to deposit a two-layer coating: HA top coating (HAT) and HA+TiO(2) bond coat (HTBC).

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  • Microstructural and phase analysis were performed using SEM, EPMA, XRD, and TEM.
  • Heat treatment at 650°C for 120 min was applied, followed by characterization of as-sprayed and heat-treated coatings.

    • Main Results:

    • The HTBC exhibited an alternating pattern of HA and TiO(2) phases, bonding well to both the HAT and Ti substrate.
    • Heat treatment at 650°C restored HA structural integrity and improved bonding at the HTBC/Ti substrate interface.
    • The composite coating demonstrated reduced residual stress and enhanced toughness, attributed to TiO(2) acting as crack barriers and decreased CTE mismatch.

    Conclusions:

    • The developed two-layer HTH coating offers improved structural integrity and interfacial bonding compared to single-layer HA coatings.
    • Heat treatment is crucial for optimizing the performance of HA-based composite coatings on titanium.
    • The composite coating design effectively mitigates residual stress and enhances mechanical properties, suggesting potential for improved orthopedic implant applications.