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http://dx.doi.org/10.9725/kstle.2014.30.2.108

Dry Friction Characteristics of Bulk Amorphous Thermal Spray Coating and Amorphous Metallic Matrix Composites  

Jang, Beomtaek (School of Mechanical Engineering, Kyungpook National University)
Yi, Seonghoon (Dept. of Materials Science and Metallurgy, Kyungpook National University)
Publication Information
Tribology and Lubricants / v.30, no.2, 2014 , pp. 108-115 More about this Journal
Abstract
The friction behaviors of bulk amorphous thermal spray coating (BAC) and second phase-reinforced composite coatings using a high velocity oxy-fuel spraying process were investigated using a ball-on-disk test rig that slides against a ceramic ball in an atmospheric environment. The surface temperatures were measured using an infrared thermometer installed 50 mm from the contact surface. The crystallinities of the coating layers were determined using X-ray diffraction. The morphologies of the coating layers and worn surfaces were observed using a scanning electron microscope and energy-dispersive spectroscopy. The results show that the friction behavior of the monolithic amorphous coating was sensitive to the testing conditions. Under lower than normal loads, a low and stable friction coefficient of about 0.1 was observed, whereas under a higher relative load, a high and unstable friction coefficient of greater than 0.3 was obtained with an instant temperature increase. For the composite coatings, a sudden increase in friction coefficient did not occur, i.e., the transition region did not exist and during the friction test, a gradual increase occurred only after a significant delay. The BAC morphology observations indicate that viscous plastic flow was generated with low loads, but severe surface damage (i.e., tearing) occurred at high loads. For composite coatings, a relatively smooth surface was observed on the worn surface for all applied loads.
Keywords
amorphous thermal spray coating; amorphous metallic matrix composite; friction characteristic; sliding interface temperature;
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