Improved bonding strength between TiO2 film and Ti substrate by microarc oxidation

M. H. Hong, D. H. Lee, Kwangmahn Kim, Y. K. Lee

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Titanium (Ti) and its alloys have proved to be very suitable materials for load-bearing bioimplant applications. Unfortunately, Ti and its alloys exhibit poor osteoinductive properties like most metals. This drawback was recently addressed by modified titania (TiO2). However, the bonding strength between TiO2 and substrate is not very strong. Therefore, mechanical properties and biochemical stability are very important. Many techniques have been investigated for modifying the TiO2 layer. Microarc oxidation (MAO) represents a relatively new surface modification technique where thick, hard and anticorrosive oxide coatings can be easily and cost-effectively fabricated. In this study, various chemicals were used as the electrolyte for MAO. Hydroxyapatite (HA) suspension was prepared by dispersing HA powder in distilled water and adjusting the pH in the range of 4-11. Bonding strength between TiO2 film and substrate was determined by modified ASTM C-633 and the ability to form apatite was confirmed after MAO, by soaking in simulated body fluid (SBF). The bonding strength decreased when the electrolyte was changed, but increased with increasing voltage. Bioactivity was only present in NaOH-treated specimens.

Original languageEnglish
Pages (from-to)492-496
Number of pages5
JournalSurface and Interface Analysis
Volume42
Issue number6-7
DOIs
Publication statusPublished - 2010 Jun 1

Fingerprint

Titanium
titanium
Durapatite
Hydroxyapatite
Titanium alloys
Oxidation
Electrolytes
oxidation
Bearings (structural)
Substrates
electrolytes
Apatites
body fluids
soaking
Body fluids
dispersing
Apatite
apatites
Bioactivity
Powders

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

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Improved bonding strength between TiO2 film and Ti substrate by microarc oxidation. / Hong, M. H.; Lee, D. H.; Kim, Kwangmahn; Lee, Y. K.

In: Surface and Interface Analysis, Vol. 42, No. 6-7, 01.06.2010, p. 492-496.

Research output: Contribution to journalArticle

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