Nanocrystalline Diamond Coating on Steel with SiC Interlayer

Myung, Jaewoo; Kang, Chris

doi:10.5695/jkise.2014.47.2.075

Journal of the Korean institute of surface engineering

2014

DOI: 10.5695/jkise.2014.47.2.075

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Nanocrystalline Diamond Coating on Steel with SiC Interlayer

Jaewoo Myung¹,

Chris Kang²

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Cited by 2 publications

References 13 publications

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Nanocrystalline Diamond Coated SiC Balls in Tribometer

Im¹,

Kang

2014

Journal of the Korean institute of surface engineering

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Nanocrystalline diamond(NCD) coated SiC balls were applied in a ball-on-disk tribometer. After seeding in an ultrasonic bath containing nanometer diamond powders, 2.2 µm thick NCD films were deposited on sintered 3 mm diameter SiC balls at 600 o C in a 2.45 GHz microwave plasma CVD system. Bare ZrO 2 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 ZrO 2 , 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, ZrO 2 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.

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Nanocrystalline Diamond Coated SiC Balls in Tribometer

Im¹,

Kang

2014

Journal of the Korean institute of surface engineering

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Heat Spreading Properties of CVD Diamond Coated Al Heat Sink

Yoon¹,

Im²,

Kang

2015

Journal of the Korean institute of surface engineering

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Nanocrystalline diamond(NCD) coated aluminium plates were prepared and applied as heat sinks for LED modules. NCD films were deposited on 1 mm thick Al plates for times of 2 -10 h in a microwave plasma chemical vapor deposition reactor. Deposition parameters were the microwave power of 1.2 kW, the working pressure of 90 Torr, the CH 4 /Ar gas ratio of 2/200 sccm. In order to enhance diamond nucleation, DC bias voltage of −90 V was applied to the substrate during deposition without external heating. NCD film was identified by X-ray diffraction and Raman spectroscopy. The Al plates with about 300 nm thick NCD film were attached to LED modules and thermal analysis was carried out using Thermal Transient Tester (T3ster) in a still air box. Thermal resistance of the module with NCD/Al plate was 3.88 K/W while that with Al plate was 5.55 K/W. The smaller the thermal resistance, the better the heat emission. From structure function analysis, the differences between junction and ambient temperatures were 12.1 o C for NCD/Al plate and 15.5 o C for Al plate. The hot spot size of infrared images was larger on NCD/Al than Al plate for a given period of LED operation. In conclusion, NCD coated Al plate exhibited better thermal spreading performance than conventional Al heat sink.

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Nanocrystalline Diamond Coating on Steel with SiC Interlayer

Cited by 2 publications

References 13 publications

Nanocrystalline Diamond Coated SiC Balls in Tribometer

Nanocrystalline Diamond Coated SiC Balls in Tribometer

Heat Spreading Properties of CVD Diamond Coated Al Heat Sink

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