Enhancement of adhesive strength of hydroxyapatite films on Ti-29Nb-13Ta-4.6Zr by surface morphology control

Junko Hieda, Mitsuo Niinomi, Masaaki Nakai, Ken Cho, Tatsuya Gozawa, Hirokazu Katsui, Rong Tu, Takashi Goto

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Hydroxyapatite (HAp) films were deposited on a Β-type titanium alloy, Ti-29Nb-13Ta-4.6Zr (TNTZ), by metal organic chemical vapor deposition (MOCVD) in order to improve its hard-tissue compatibility. The surface morphologies of TNTZ substrates were changed by acid treatments and mechanical polishing prior to the HAp film deposition. The adhesive strength of the HAp films formed on TNTZ substrates treated with an HF solution increased to twice that of the HAp film deposited on a TNTZ substrate with a mirror-like finish. Complex microstructures with deeply etched grain boundaries, formed on the TNTZ substrates after immersion in the HF solution, were responsible for the increase in the adhesive strength of the HAp film caused by an interlocking effect. The HAp films on TNTZ substrates treated with a H2SO4 solution exhibited lower adhesive strength than HAp films on TNTZ substrates treated with HF solution, regardless of the surface roughness of the substrates. Additionally, acid treatments using HNO3 and H2O2 solutions did not change the surface morphologies of the TNTZ substrates. The complex microstructures with deeply etched grain boundaries and nanosized asperities formed on the TNTZ substrates are important factors in the improvement of the adhesive strengths of HAp films deposited on TNTZ substrates.

Original languageEnglish
Pages (from-to)232-239
Number of pages8
JournalJournal of the Mechanical Behavior of Biomedical Materials
Volume18
DOIs
Publication statusPublished - 2013 Feb 1

Keywords

  • Acid treatment
  • Adhesive strength
  • Hydroxyapatite film
  • Surface morphology
  • Β-type titanium alloy

ASJC Scopus subject areas

  • Biomaterials
  • Biomedical Engineering
  • Mechanics of Materials

Fingerprint Dive into the research topics of 'Enhancement of adhesive strength of hydroxyapatite films on Ti-29Nb-13Ta-4.6Zr by surface morphology control'. Together they form a unique fingerprint.

  • Cite this