Hydrothermal crystallization effect on the improvement of erosion resistance and reliability of plasma-sprayed hydroxyapatite coatings

Chung Wei Yang, Truan Sheng Lui, Li Hui Chen

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

The aim of present study is to investigate the crystallization effect of air and hydrothermal heat treatments on the erosion resistance, failure behaviors and reliability of plasma-sprayed HA coatings (HACs). Experimental results show that just 150 °C is required to see a significant increase in crystallinity and phase purity for hydrothermally-treated HACs compared with the high-temperature (600 °C) air heat treatment. The significantly improved bonding strength of hydrothermally-treated HACs can be recognized for the self-healing effect that resulted from the hydrothermal crystallization. Results of erosion test indicated that the erosion resistance decreases with increasing erosion impact angle. The maximum erosion rate occurred at 90° impact angle for all the as-sprayed and heat-treated HACs. The erosion resistance of plasma-sprayed HACs is significantly improved through the crystallization of a coating after heat treatments. Furthermore, it should be worth noting that the erosion resistance for hydrothermally-treated HACs is much better than as-sprayed and air heat-treated HACs at any impact angle. The statistical analysis of Weibull model shows that plasma-sprayed coatings are generally reliable materials with a wear-out failure model (with a Weibull modulus m > 3) of increasing failure rate (IFR). The knowledge of the minimum strength and failure behavior will be very helpful for understanding the HA coating reliability for further biological applications. Crown

Original languageEnglish
Pages (from-to)5380-5385
Number of pages6
JournalThin Solid Films
Volume517
Issue number17
DOIs
Publication statusPublished - 2009 Jul 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

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