Mechanical properties and microarchitecture of nanoporous hydroxyapatite bioceramic nanoparticle coatings on Ti and TiN

Andrei Stanishevsky*, Shafiul Chowdhury, Nathaniel Greenstein, Helene Yockell-Lelievre, Jari Koskinen

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Abstract

Hydroxyapatite (HA) based bioceramic materials are usually prepared at high sintering temperatures to attain suitable mechanical properties. The sintering process usually results in a material which is compositionally and morphologically different from the non stoichiometric nano-crystalline HA phase of hard tissue. At the same time, HA particulates used as precursors in ceramic manufacturing are often very similar to the natural HA nanocrystals. It has been shown that synthetic nanoparticle HA (nanoHA) based materials improve the biological response in vitro and in vivo, but information on the mechanical properties of these materials is scarce. In this work we studied HA nanoparticle (10 - 80 nm mean size) coatings with 30 - 70% porosity prepared by a dip-coating technique on Ti and TiN substrates. It has been found that the mechanical properties of HA nanoparticle coatings are strongly influenced by the initial size, morphology, and surface treatment of nanoparticles. The nanoindentation Young's modulus and hardness of as-deposited nanoHA coatings were in the range of 2.5 - 6.9 GPa and 80 - 230 MPa, respectively. The coatings were stable after annealing up to at least 600 °C, (with Young's modulus reaching 23 GPa and hardness reaching 540 MPa), as well as in simulated body fluids.

Original languageEnglish
Title of host publicationMaterials Research Society Symposium Proceedings
Pages110-115
Number of pages6
Volume975
Publication statusPublished - 2006
MoE publication typeA4 Article in a conference publication
EventMaterials Research Society Fall Meeting - Boston, United States
Duration: 27 Nov 20061 Dec 2006

Conference

ConferenceMaterials Research Society Fall Meeting
Abbreviated titleMRS
CountryUnited States
CityBoston
Period27/11/200601/12/2006

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