کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
616990 | 1454970 | 2015 | 9 صفحه PDF | دانلود رایگان |
• We study the effect of TiC on tribo-mechanical properties of Fe3Al/TiC coatings.
• Fe3Al/TiC powders have been produced via reactive milling of Fe3Al with Ti and C.
• The composite coatings consisted of TiC uniformly dispersed within Fe3Al.
• Addition of more than 30 mol% of TiC was beneficial in improving hardness.
• Coatings with 50 and 70 mol% TiC exhibited excellent sliding wear resistance.
This investigation aims to reveal the effect of TiC particles on the wear resistance of Fe3Al/TiC composite coatings against alumina counterbody. The coating feedstock, in powder form, was produced by high-energy ball milling of Fe3Al, Ti and graphite powders. The coatings were provided by spraying the feedstock on a steel substrate using the High-Velocity Oxy-Fuel (HVOF) technique. The effect of TiC addition on dry sliding wear rates of the coatings at sliding speeds ranging from 0.04 to 0.8 m.s−1 and under a constant load of 5 N was studied. Coatings made from pure Fe3Al exhibited a relatively high wear rate. The Vickers hardness and wear resistance of the coatings increased with increasing TiC content in the Fe3Al matrix. The wear mechanism strongly depends on the sliding speed and the content of TiC particles. It was observed that at low sliding speed, the predominant wear mechanism of the coatings with 0, 10 and 30 mol.% TiC was fatigue wear, whereas at high sliding speeds, the wear mechanism is oxidation. For Fe3Al–50 mol.% TiC and Fe3Al–70 mol.% TiC composites, abrasive and oxidation wear are most likely the dominant wear mechanisms.
Journal: Wear - Volumes 342–343, 15 November 2015, Pages 154–162