Phase-sequenced deposition of calcium titanate/hydroxyapatite films with controllable crystallographic texture onto Ti6Al4V by triethyl phosphate-regulated hydrothermal crystallization

Daniel J. Haders, Alexander Burukhin, Yizhong Huang, David J.H. Cockayne, Richard E. Riman

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

The aim of this study was to investigate the use of triethyl phosphate (TEP) to regulate the hydrothermal crystallization of hydroxyapatite (HA) films onto Ti6Al4V substrates. The growth mechanism of the HA film and the development of [0001] HA crystallographic texture were studied. Films were crystallized in a 0.232 m Ca(NO3)2-0.232 m EDTA-0.187 m TEP-1.852 m KOH-H2O chemical system with a final isothermal temperature of 200 °C, and then evaluated at synthesis times from 0 to 46 h by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), energy dispersive X-ray (EDX) analysis, and X-ray pole figures. Thermodynamic phase stability diagrams were calculated to validate experimental findings. XRD, FESEM, TEM, and EDX results demonstrated the crystallization of a CaTiO3 film below 180 °C and a HA film above 180 °C. FESEM and X-ray pole figure analysis revealed a refinement of the orientation of the (0002) HA crystallographic plane and the c-axis of hexagonal single crystals of HA, [0001], with increasing synthesis time. On the basis of these results, it is concluded that the use of TEP-regulated hydrothermal crystallization enables the deposition of CaTiO3 and then HA in a single, phase sequenced process, the first such process reported in the hydrothermal HA literature. The HA film is deposited by means of a competitive growth mechanism that enables the [0001] crystallographic orientation of hexagonal single crystals to be engineered with synthesis time.

Original languageEnglish
Pages (from-to)3412-3422
Number of pages11
JournalCrystal Growth and Design
Volume9
Issue number8
DOIs
Publication statusPublished - 5 Aug 2009
Externally publishedYes

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