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Tribological behavior of carbon nanotube composite coatings on C/C composite
Dae-SoonLim,Jeong-WookAn 한양대학교 세라믹연구소 2002 Journal of Ceramic Processing Research Vol.3 No.3
Carbon nanotube (CNT) composite coatings were applied onto C/C composites to improve their wear behavior. CNT was synthesized by catalytic decomposition of acetylene gas. The nanotube slurry was prepared by mixing CNT, phenolic resin and methanol to deposit on and infiltrate into the C/C composites. The CNT composite coatings on C/C composites were carbonized in a nitrogen atmosphere. The tribological properties were determined using a ball on disk type wear tester. The results showed that the CNT composite coating decreased the wear rate significantly and increased the friction coefficient slightly.
Effect of the Properties of Uniformly Patterned Micro-Diamond Pellets on Sapphire Grinding
Joong-Cheul Yun,Byung-young Wang,Eung-seok Lee,Choong-Hyun Lee,Young-kyun Lim,Dae-SoonLim,Han-Gyoung Cho 한국물리학회 2018 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.73 No.7
If nanoscale roughness of machined surfaces is to be achieved, a machining method using a ductile grinding mode is required. If this using a diamond tool is to be realized, uniform patterned micro-diamond pellets must be produced on the tool surface. In this study, uniform patterned micro-diamond pellets were fabricated by using Lithographie Galvanoformung Abformung (LIGA) technology combined with electroplating technology. The effect of the size of the patterned diamond pellet on sapphire wafer grinding was analyzed using a scanning electron microscope and a surface profiler after grinding. As a result, 12 uniformly patterned micro-diamond pellets were fabricated, and a sapphire substrate was ground to obtain a surface roughness (Ra) of 5 nm or less.