Microstructural healing with interfacial reaction layers on the adhesive strength enhancement of plasma-sprayed hydroxyapatite coatings

Chung Wei Yang, Truan Sheng Lui

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1 Citation (Scopus)

Abstract

The effect of hydrothermal crystallization and adding reinforced intermediate layers on improving the tensile adhesion of plasma-sprayed HA coatings (HAC) was investigated. The experimental results show that the index of crystallinity (IOC) and phase purity of hydrothermally-treated HAC (HT-HAC) are increased by the low-temperature hydrothermal treatment. The microstructural healing effect with nano-size HA crystallites is significant to diminish the defects and prevent mechanical strength degradation for the HT-HAC. XPS analysis demonstrates that hydrothermal crystallization helps to promote the interfacial TiOH chemical reaction. HA composite coatings with CP-Ti and ZrO2 intermediate layers provide another strengthening effect compared with the hydrothermal-heating method. The inter-diffusion of Ca results in a chemical bonding at the HA/ZrO2 interface, which results in the increase of the adhesive strength of composite coatings. The fracture behavior is different between the crystallization-induced HAC and the composite coatings. The HT-HAC remains on the substrate with an evident cohesive failure. The adhesive failure occurred at HA/intermediate layers for composite coatings. Failures with less percentage area of interfacial fracture are indicative of a higher strength of a coating.

Original languageEnglish
Pages (from-to)76-84
Number of pages9
JournalInternational Journal of Modern Physics B
Volume24
Issue number1-2
DOIs
Publication statusPublished - 2010 Jan 20

All Science Journal Classification (ASJC) codes

  • Statistical and Nonlinear Physics
  • Condensed Matter Physics

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