펨토초 레이저 공정 환경에 따른 타이타늄 표면의 효과적인 표면 성질 제어
- 펨토초 레이저 공정 환경에 따른 타이타늄 표면의 효과적인 표면 성질 제어
- 박재호; 정용우; 정홍수; 김유찬; 옥명렬; 석현광; 정석; 전호정
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- Surface modification engineering by laser has benefits for non-contact machining and selective process depending on the conditions of the laser such as laser beam size, wavelength, power and so on. Especially, femtosecond(fs) lasers have advantages due to their ultrashort pulse duration that minimize the thermal affected zone comparing with longer pulse lasers, because fs laser applies a ultrashort laser pulse that is shorter than thermal transfer time (~10 ps) between atoms and atoms. In addition, via laser surface texture engineering, dual scale roughness structures can be created, which results in modification of surface properties such as wettability. In this study, we could observe different micro/nano structures that are fabricated by laser scanning process on titanium surface under air, He, Ar and Ethanol. As a result, we can demonstrate that the different structures are formed depending on the gas density, fluid state and thermal conductivity in laser processing. Also, we can check surface property by measuring the contact angle on the modified surfaces. Henceforth, through fs laser surface modification, it can be expected to control surface property of various metals and alloy.
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