나노다이아몬드가 첨가된 윤활제의 마모 특성 연구
Study on Wear Characteristics of Lubricants with Nano-diamond Additives
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초록
Multiple additives can help improve the performance of generally used lubricants. These additivesinclude MoS2, cadmium, chloride, indium, sulfide, and phosphide, which are harmful to both humans and theenvironment. Thus, researchers in this industry have been trying to reduce the use of these additives by findingalternatives. Nanodiamonds are one of these candidates. Nanodiamond particles are very hard, chemically stable,and highly heat-conductive. This research involved uniformly dispersing nanodiamond particles in marine engineoils via a matrix synthesis method at various concentrations (0, 0.1, 0.3, 0.5, and 1.0 wt). Friction and wear testsinvolved constant loads on ball-on-disk specimens, where the ball was AISI 51200 steel, the disk was AISI 1020steel, and the sliding speed was 0.217 m/s. The lowest wear occurred at a suitable concentration of nanodiamonds(0.3 wt). However, excessive amounts of nanodiamonds caused them to act as abrasive debris because of theirhardness, which increased the wear amount. The friction coefficient decreased as the nanodiamond concentrationincreased because their octagonal, almost spherical shape caused them to act as rolling contact elements betweentwo surfaces.
Abstract
Multiple additives can help improve the performance of generally used lubricants. These additivesinclude MoS2, cadmium, chloride, indium, sulfide, and phosphide, which are harmful to both humans and theenvironment. Thus, researchers in this industry have been trying to reduce the use of these additives by findingalternatives. Nanodiamonds are one of these candidates. Nanodiamond particles are very hard, chemically stable,and highly heat-conductive. This research involved uniformly dispersing nanodiamond particles in marine engineoils via a matrix synthesis method at various concentrations (0, 0.1, 0.3, 0.5, and 1.0 wt). Friction and wear testsinvolved constant loads on ball-on-disk specimens, where the ball was AISI 51200 steel, the disk was AISI 1020steel, and the sliding speed was 0.217 m/s. The lowest wear occurred at a suitable concentration of nanodiamonds(0.3 wt). However, excessive amounts of nanodiamonds caused them to act as abrasive debris because of theirhardness, which increased the wear amount. The friction coefficient decreased as the nanodiamond concentrationincreased because their octagonal, almost spherical shape caused them to act as rolling contact elements betweentwo surfaces.
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