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논문 기본 정보

자료유형
학술저널
저자정보
Woo-Young Lee (Nagoya University) Ju-hyun Choi (Korea Photonics Technology Institute (KOPTI))
저널정보
한국트라이볼로지학회 Tribology and Lubricants 한국윤활학회지 제35권 제2호
발행연도
2019.4
수록면
106 - 113 (8page)

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초록· 키워드

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We investigated the application of tetrahedral amorphous carbon (ta-C) coatings to fabricate a glass lens manufactured using a glass molding process (GMP). In this work, ta-C coatings with different thickness (50, 100, 150 and 200 nm) were deposited on a tungsten carbide (WC-Co) mold using the X-bend filter of a filtered cathode vacuum arc. The effects of thickness on mechanical and tribological properties of the coating were studied. These ta-C coatings were characterized by atomic force microscopy, scanning electron microscopy, nano-indentation measurements, Raman spectrometry, Rockwell-C tests, scratch tests and ball on disc tribometer tests. The nano-indentation measurements showed that hardness increased with an increase in coating thickness. In addition, the G-peak position in the Raman spectra analysis was right shifted from 1520 to 1586 cm<SUP>−1</SUP>, indicating that the sp³ content increased with increasing thickness of ta-C coatings. The scratch test showed that, compared to other coatings, the 100-nm-thick ta-C coating displayed excellent adhesion strength without delamination. The friction test was carried out in a nitrogen environment using a ball-on-disk tribometer. The 100-nm-thick ta-C coating showed a low friction coefficient of 0.078. When this coating was applied to a GMP, the life time, i.e., shot counts, dramatically increased up to 2,500 counts, in comparison with Ir-Re coating.

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Abstract
1. Introduction
2. Experiments
3. Results and Consideration
4. Conclusion
References

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UCI(KEPA) : I410-ECN-0101-2019-551-000671077