Journal
WEAR
Volume 269, Issue 7-8, Pages 590-601Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.wear.2010.06.006
Keywords
Thermal oxidation; Titanium matrix composite (TMC); Wear mechanism; Tribolayer; Oxygen diffused zone; Abrasion
Funding
- Natural Science and Engineering Council of Canada (NSERC)
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This study employed thermal oxidation (TO) treatment as a way of improving the wear resistance of Ti-6Al-4V/10 vol.% TIC composites (TMCs) - especially at high loading conditions. The study revealed the formation of a uniform oxide layer (2.6 +/- 0.35 mu m thick) supported by an oxygen diffused zone (31.2 +/- 11.6 mu m deep) on the composite's surface when thermal oxidation was carried out at 800 degrees C for 20 min. The dry sliding wear behaviour of the TO-treated and untreated TMCs was investigated using a ball-on-disk tribometer within a load range of 2-10 N. According to the experimental results, different wear behaviours were identified for TMCs and TO-TMCs as a function of applied load. The TO-treatment significantly reduced the wear rates of TMCs, especially at high loading conditions, due to the presence of a hard oxide layer and diffused zone that not only enhanced the load-bearing capacity of the TMCs, but also hindered the abrasive effect of the TiC particles and the extensive plastic deformation of Ti matrix. (C) 2010 Elsevier B.V. All rights reserved.
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