펨토초 레이저 공정 환경에 따른 타이타늄 표면의 효과적인 표면 성질 제어

Title
펨토초 레이저 공정 환경에 따른 타이타늄 표면의 효과적인 표면 성질 제어
Authors
박재호정용우정홍수김유찬옥명렬석현광정석전호정
Issue Date
2015-11
Publisher
대한기계학회
Abstract
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.
URI
http://pubs.kist.re.kr/handle/201004/50561
Appears in Collections:
KIST Publication > Conference Paper
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