532 nm 파장의 큐스위치 Nd:YAG 레이저를 이용한 스테인리스 스틸 표면 제염특성 Decontamination Characteristics of 304 Stainless Steel Surfaces by a Q-switched Nd:YAG Laser at 532 nm원문보기
레이저 용발법에 의한 금속 표면 제염특성을 평가하였다. 레이저로는 파장 532 nm, 펄스에너지 150 mJ, 펄스폭 5 ns의 큐스위치 Nd:YAG를 적용하였고, 금속 표면에 $CsNO_3$, $Co(NH_4)_2(SO_4)_2$, $Eu_2O_3$ 그리고 $CeO_2$를 오염시켜 이들의 제염 특성을 평가하였다. 제염 변수로는 레이저 적용횟수, 레이저 에너지 밀도 및 레이저 조사 각도 특성을 평가하였으며 각각 8, 13.3 J/$cm^2$ 및 $30^{\circ}$의 최적 조건을 확인하였다. 제염 효율은 오염성분의 비점과 관련이 있었으며 $CsNO_3>Co(NH_4)_2(SO_4)_2>Eu_2O_3>CeO_2$ 순이었다. 또한 여러 에너지 밀도 조건에서 스테인레스 스틸 재질의 식각 깊이 제어 특성을 규명하였다.
레이저 용발법에 의한 금속 표면 제염특성을 평가하였다. 레이저로는 파장 532 nm, 펄스에너지 150 mJ, 펄스폭 5 ns의 큐스위치 Nd:YAG를 적용하였고, 금속 표면에 $CsNO_3$, $Co(NH_4)_2(SO_4)_2$, $Eu_2O_3$ 그리고 $CeO_2$를 오염시켜 이들의 제염 특성을 평가하였다. 제염 변수로는 레이저 적용횟수, 레이저 에너지 밀도 및 레이저 조사 각도 특성을 평가하였으며 각각 8, 13.3 J/$cm^2$ 및 $30^{\circ}$의 최적 조건을 확인하였다. 제염 효율은 오염성분의 비점과 관련이 있었으며 $CsNO_3>Co(NH_4)_2(SO_4)_2>Eu_2O_3>CeO_2$ 순이었다. 또한 여러 에너지 밀도 조건에서 스테인레스 스틸 재질의 식각 깊이 제어 특성을 규명하였다.
Metal surface decontamination characteristics were investigated by using a laser ablation method. A second harmonic generation of a Q-switched Nd:YAG laser with a wave length of 532 nm, a pulse energy of 150 mJ and a pulse width of 5 ns was employed to assess the decontamination performance for meta...
Metal surface decontamination characteristics were investigated by using a laser ablation method. A second harmonic generation of a Q-switched Nd:YAG laser with a wave length of 532 nm, a pulse energy of 150 mJ and a pulse width of 5 ns was employed to assess the decontamination performance for metal surfaces contaminated with $CsNO_3$, $Co(NH_4)_2(SO_4)_2$, $Eu_2O_3$ and $CeO_2$. The ablation behavior was investigated for the decontamination variables such as a number of laser shots, laser fluence and an irradiation angle. Their optimum values were found to be 8, 13.3 J/$cm^2$ and $30^{\circ}$, respectively. The decontamination efficiency was different depending on the kinds of the contaminated ions, due to their different melting and boiling points and was in the order: $CsNO_3>Co(NH_4)_2(SO_4)_2>Eu_2O_3>CeO_2$. We also evaluated a correlation between the metal ablation thickness and the number of laser shots for the different laser fluences.
Metal surface decontamination characteristics were investigated by using a laser ablation method. A second harmonic generation of a Q-switched Nd:YAG laser with a wave length of 532 nm, a pulse energy of 150 mJ and a pulse width of 5 ns was employed to assess the decontamination performance for metal surfaces contaminated with $CsNO_3$, $Co(NH_4)_2(SO_4)_2$, $Eu_2O_3$ and $CeO_2$. The ablation behavior was investigated for the decontamination variables such as a number of laser shots, laser fluence and an irradiation angle. Their optimum values were found to be 8, 13.3 J/$cm^2$ and $30^{\circ}$, respectively. The decontamination efficiency was different depending on the kinds of the contaminated ions, due to their different melting and boiling points and was in the order: $CsNO_3>Co(NH_4)_2(SO_4)_2>Eu_2O_3>CeO_2$. We also evaluated a correlation between the metal ablation thickness and the number of laser shots for the different laser fluences.
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제안 방법
The laser was tightly focused on the target. Before transmitting the beam through the focusing lens it was shaped with the help of the configuration of a set of lenses that provide uniform temporal and spatial distribution of energy within the beam. Fig.
A flying articulate optics was used for a transfer and a convergence of a laser beam at the target point. The specimen was irradiated by changing the angle and the number of laser shots. The laser shot number was varied from 1 to 32 and the fluence from 7.
The removal efficiencies for the three contaminants were in the order of CsNO3> Co(NH4)2(SO4)2>Eu2O3>CeO2. We evaluated a correlation between the metal ablation depths and the number of laser shots for the different laser fluences in order to make it possible to estimate ablation conditions such as a number of laser shots and laser fluence required for a designated decontamination factor, which can be different from the case by case.
. We evaluated the effect of decontamination process variables such as a number of laser shots, laser fluence and an allowable irradiation angle on the ablation characteristics. Optimum values of the variables were found to be 8, 13.
대상 데이터
The four kinds of simulated specimens have been used for laser decontamination tests. The experimental specimens were prepared as follows: Co(NH4)2(SO4)2 and CsNO3 solutions which are designated to simulate the ionic contaminations were dropped onto the specimen surfaces, respectively. On the other hand, a Eu2O3 and a CeO2 powder (Aldrich Chemical Company, Inc.
[5] had studied the effect of laser processing parameters on the chemical and structural modifications of iron surfaces. They used a Nd:YAG laser with pulse duration of 5 ns at 355, 532 and 1064 nm, respectively and KrF excimer laser system with pulse duration of 26 ns at 248 nm. From the test results, they reported that some differences were observed in the kinds of oxides detected: FeO is mainly formed with the KrF laser whereas Fe3O4 is more efficiently formed in the case of the Nd:YAG laser.
이론/모형
3 J/cm2, respectively. These flux data were inserted to the HertzKnudsen equation to evaluate the saturation vapor pressure. Then, the obtained vapor pressure data were once again inserted to the Clasius-Clapeyron equation to evaluate the surface temperature.
성능/효과
They used a Nd:YAG laser with pulse duration of 5 ns at 355, 532 and 1064 nm, respectively and KrF excimer laser system with pulse duration of 26 ns at 248 nm. From the test results, they reported that some differences were observed in the kinds of oxides detected: FeO is mainly formed with the KrF laser whereas Fe3O4 is more efficiently formed in the case of the Nd:YAG laser. Tam et al.
[6] reported laser cleaning techniques for the removal of surface particulates. They concluded that the main parameters which affected the cleaning process were laser fluence, pulse duration and a wavelength. Dimogerontakis et al.
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