Details

Autor(en) / Beteiligte

• Wang, Song
• Liao, Zhenhua
• Liu, Yuhong
• Liu, Weiqiang

Titel

Influence of thermal oxidation temperature on the microstructural and tribological behavior of Ti6Al4V alloy

Ist Teil von

• Surface & coatings technology, 2014-02, Vol.240, p.470-477

Ort / Verlag

Amsterdam: Elsevier B.V

Erscheinungsjahr

2014

Quelle

Elsevier ScienceDirect Journals

Beschreibungen/Notizen

• Thermal oxidation process under water vapor environment was performed on biomedical titanium alloys for 4h at different treatment temperature changing from 600°C to 800°C to improve the surface properties for the application of artificial joints. In order to ascertain the suitability of thermal oxidized sample as a bio-implant, the morphological features, structural characteristics, microhardness and tribological behavior in dry friction were evaluated. Alumina and rutile as the new phases appeared for the thermal oxidized samples with the hardness increasing. The mechanism of oxidation involved nucleation of a thin layer of oxide followed by its agglomeration and growth to completely cover the surface. The representative coating thickness values for samples oxidized at 600°C, 700°C and 800°C were 1.2, 7.5 and 34.9μm, respectively. The coefficient of friction for oxidized Ti6Al4V alloy was lower than the untreated with the maximum reduction of 62% when oxidized at 700°C. The wear volume results indicated that thermal oxidization effectively improved the tribological behavior with a reduction of 80% at most. In this investigation, the results proved that thermal oxidation temperature could effectively influence the microstructural and tribological behavior of Ti6Al4V alloy and the optimal oxidation temperature was 700°C. •Mechanism of oxidation is analyzed and an enriched rutile TiO2 coating is formed.•Microhardness increases 1.3 times and thickness value reaches 7.5μm at 700°C.•Coefficient of friction decreases with 62% at most after thermal oxidization.•Wear volume decreases with a reduction of 80% at most after thermal oxidization.•Optimal oxidation temperature is 700°C on account of the over-all properties.