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Abrading increases oxygen and hardness of titanium surface
Osamu Miyakawa1, Seigo Okawa, Masayoshi Kobayashi
1Division of Biomaterial Science, Course for Oral Life Science, Niigata University Graduate School of Medical and Dental Sciences, Japan. miya@dent.niigata-u.ac.jp
Dental Materials Journal
|May 19, 2006
Summary
Abrading titanium (Ti) surfaces with coarse silicon carbide (SiC) grit increases surface oxygen and hardness more than fine grit. Coarse grit causes significant strain, enhancing surface hardening.
Area of Science:
- Materials Science
- Surface Engineering
- Tribology
Background:
- Surface properties of CP Ti are critical for applications.
- Understanding the effects of abrasive treatments is essential for material modification.
Purpose of the Study:
- To investigate the impact of different silicon carbide (SiC) grit sizes on the surface characteristics of CP Ti.
- To analyze the changes in oxygen content, hardness, and strain in abraded titanium surfaces.
Main Methods:
- Mirror-polishing and abrasion of CP Ti using 16 µm and 3 µm SiC papers.
- Surface characterization using Electron Probe Microanalysis (EPMA), X-ray Photoelectron Spectroscopy (XPS), X-ray Diffraction (XRD), and hardness testing.
Main Results:
- Abrasion increased surface oxygen and hardness compared to polished Ti.
- Coarse grit (16 µm) caused significant scratching, hindering oxide film growth but extending the interfacial zone.
- Fine grit (3 µm) resulted in surface rubbing, allowing both oxide film and interfacial zone extension.
- A thicker oxide film (approx. 10 nm) was inferred from the yellow surface color.
- The oxygen-rich interfacial zone exhibited high coherency strain due to lattice mismatch.
Conclusions:
- Both solute oxygen hardening and strain hardening contribute to the surface hardening of abraded Ti.
- Coarse grit abrasion leads to higher, non-uniform strain accumulation in the Ti substrate, resulting in greater surface hardening.
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