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페라이트계 스테인리스 강 MAG 용접의 기계적 물성에 관한 연구
이경철,김재성,김현재,임경호,이보영,Lee, Gyeong-Cheol,Kim, Jae-Seong,Kim, Hyun-Jae,Lim, Kyoung-Ho,Lee, Bo-Young 대한용접접합학회 2009 대한용접·접합학회지 Vol.27 No.2
Ferritic stainless steels have a good heat resistance and economic advantage. They are used for applications such as automotive exhaust systems where resistance to general corrosion is superior to carbon steels. However, there are not enough research for ferritic stainless steels on weldability mainly used as automotive exhaust manifolds. In this study, mechanical and microstructure properties of as-welded STS 429L and STS 444 ferrite stainless steels were confirmed by tensile, bending, hardness test, optical microscopy and scanning electron microscopy. Tensile strength of the STS 444 is higher than the STS 429L when it is a raw material. In contrast to this fact, STS 429L indicated higher tensile strength after butt welded. In addition, the hardness have a increasing tendency as getting down on the bead.
안민영,이경철,이홍규,이상돈,이천,Ahn, Min-Young,Lee, Kyoung-Cheol,Lee, Hong-Kyu,Lee, Sang-Don,Lee, Cheon 한국전기전자재료학회 2000 전기전자재료학회논문지 Vol.13 No.6
The paste on the glass or fabrication of the PDP(Plasma Display Panel) barrier rib was selectively etched using focused A $r_{+}$ laser(λ=514 nm) and Nd:YAG(λ=532, 266 nm) laser irradiation. The depth of the etched grooves increase with increasing a laser fluence and decreasing a laser beam scan speed. Using second harmonic of Nd:YAG laser(532 nm) the etching threshold laser fluence was 6.5 mJ/c $m^2$ for the sample of PDP barrier rib. The thickness of 180 ${\mu}{\textrm}{m}$ of the sample on the glass was clearly removed without any damage on the glass substrate by fluence of 19.5J/c $m^2$beam scan speed of 20${\mu}{\textrm}{m}$ /s. In order to increase the etch rate of the barrier rib material barrier rib samples heated by a resistive heater during laser irradiation. The heated sample has many defects and becomes to be fragile. This imperfection of the structure compared to the sample without heat treatment allows the effective etching by the focused laser beam. The etch rates were 65${\mu}{\textrm}{m}$/s and 270 ${\mu}{\textrm}{m}$/s at room temperature and 20$0^{\circ}C$, respectively.y.
집속 아르곤 이온 레이저 빔을 이용한 레이저 유도 직접 구리 패터닝
이홍규,이경철,안민영,이천,Lee, Hong-Kyu,Lee, Kyoung-Cheol,Ahn, Min-Young,Lee, Cheon 한국전기전자재료학회 2000 전기전자재료학회논문지 Vol.13 No.11
Laser direct writing of micro-patterned copper lines has been achieved by pyrolytic decomposition of copper formate films (Cu(HCOO)$_2$.4$H_2O$), as a metallo-organic precursor, using a focused CW Ar$^{+}$ laser beam (λ=514nm) on PCB boards and glass substrates. The linewidth and thickness of the lines wee investigated as a functin of laser power and scan speed. The profiles of the lines were measured by scanning electron microscope (SEM), surface profiler ($\alpha$-step) and atomic force measured by scanning electron microscope (SEM), surface profiler ($\alpha$-step) and atomic force microscopy (AFM). The electrical resistivities of the patterned lines were also investigated as a function of laser parameters using probe station and semiconductor analyzer. We compared resistivities of the patterned copper lines with these of the Cu bulk. Resistivities decreased due to changes in morphology and porosity of the deposit, which were about 3.8 $\mu$$\Omega$cm and 12$\mu$$\Omega$cm on PCB and glass substrates after annealing at 30$0^{\circ}C$ for 5 minutes.s.