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Microstructure and crystallinity in hydroxyapatite coatings

J Chen1, J G Wolke, K de Groot

  • 1Institute of Materials Science and Technology, Sichuan University, Chengdu, PRC.

Biomaterials
|April 1, 1994
PubMed
Summary
This summary is machine-generated.

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Hydroxyapatite (HA) coatings on metal were created using plasma spraying. Heat treatment improved HA crystallinity and surface microstructure, enhancing coating properties for potential biomedical applications.

Area of Science:

  • Biomaterials Science
  • Materials Engineering
  • Surface Science

Background:

  • Hydroxyapatite (HA) coatings are crucial for enhancing the biocompatibility and osseointegration of metallic implants.
  • Plasma spraying is a common technique for applying HA coatings, but controlling the coating's microstructure and phase composition is challenging.

Purpose of the Study:

  • To investigate the effect of plasma spraying parameters on the microstructure of hydroxyapatite (HA) coatings.
  • To evaluate the impact of vacuum heat treatment on the crystallinity and surface morphology of HA coatings.
  • To understand the phase transformations occurring in HA coatings after heat treatment.

Main Methods:

  • Production of HA coatings on metal substrates using plasma spraying with two different powder particle size distributions.

Related Experiment Videos

  • Microstructural analysis of the coatings using Scanning Electron Microscopy (SEM).
  • Crystallinity assessment using X-ray Diffraction (XRD) before and after vacuum heat treatment at 600°C.

    • Main Results:

    • SEM examination revealed scattered HA particles with varying degrees of melting (completely melted, unmelted, or partially melted cores).
    • XRD analysis demonstrated an increase in HA crystallinity following vacuum heat treatment at 600°C.
    • Post-heat treatment SEM imaging showed recrystallization of the amorphous phase and the formation of new crystalline grains on the surface of crystalline cores.

    Conclusions:

    • Plasma spraying of HA coatings results in a complex microstructure with partially melted particles.
    • Vacuum heat treatment at 600°C effectively enhances the crystallinity and modifies the surface microstructure of HA coatings.
    • The observed recrystallization and grain formation suggest potential improvements in the coating's performance for biomedical applications.