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Nanocrystalline Diamond Coated SiC Balls in Tribometer
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 Title & Authors
Nanocrystalline Diamond Coated SiC Balls in Tribometer
Im, Jong Hwan; Kang, Chan Hyoung;
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 Abstract
Nanocrystalline diamond(NCD) coated SiC balls were applied in a ball-on-disk tribometer. After seeding in an ultrasonic bath containing nanometer diamond powders, thick NCD films were deposited on sintered 3 mm diameter SiC balls at in a 2.45 GHz microwave plasma CVD system. Bare and SiC balls were prepared for comparison as test balls. Tribology tests were performed in air with pairs of three different balls and mirror polished steel(SKH51) disk. The wear tracks on balls and disks were examined by optical microscope and alpha step profiler. Under the load of 3 N, the friction coefficients of steel against , SiC and NCD-coated balls were between 0.4 and 0.8. After a few thousands sliding laps, the friction coefficient of NCD-coated balls dropped from 0.45 to below 0.1 and maintained thereafter. Under a higher load of 10 N or 20 N with a long sliding distance of 2 km, and SiC balls exhibited the similar friction coefficients as above. The friction coefficient of NCD-coated balls was less than 0.1 from the beginning and increased to above 0.1 steadily or with some fluctuations as sliding distance increased. NCD coating layers were found worn out after long duration and/or high load sliding test, which resulted in the friction coefficient higher than 0.1.
 Keywords
Nanocrystalline diamond;Microwave plasma CVD;Tribology;Friction Coefficient;
 Language
Korean
 Cited by
1.
CVD 다이아몬드가 코팅된 알루미늄 방열판의 방열 특성,윤민영;임종환;강찬형;

한국표면공학회지, 2015. vol.48. 6, pp.297-302 crossref(new window)
1.
Heat Spreading Properties of CVD Diamond Coated Al Heat Sink, Journal of the Korean institute of surface engineering, 2015, 48, 6, 297  crossref(new windwow)
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