• Journal of the Institute of Electronics Engineers of Korea SD
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• v.41 no.1
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• pp.15-20
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• 2004

The interfacial layer between the oxide film and the metal film according to RTP annealing temperature of metal film has been studied. Two types of oxides, BPSG and PETEOS, were used as a bottom layer under multi-layered metal films. We observed the interface between oxide and metal films using SEM (scanning electron microscopy), TEM (transmission electron microscopy), AES (auger electron spectroscopy). Bonding failure was occurred by interfacial reaction between the BPSG oxide and the multi-layered metal films above $650^{\circ}C$ RTP anneal. The phosphorus accumulation layer was observed at interface between BPSG oxide and metal films by AES and TEM measurements. On the other hand, bonding was always good in the sample using PETEOS oxide as a bottom layer. We have known that adhesion between BPSG and multi-layered metal films was improved when the sample was annealed below $650^{\circ}C$.

• Clean Technology
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• v.19 no.4
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• pp.453-458
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• 2013

Fly ash has capacity to oxidize or adsorb mercury in a flue gas. Mercury oxidation and adsorption efficiencies of fly ash vary depending on the properties of fly ash. This study was designed to understand reaction characteristics of mercury with fly ash components. The fly ash components were tested to determine their oxidation and adsorption capabilities for elemental mercury and oxidized mercury. A sample was synthesized with fly ash components and tested. The test results were compared with those of the fly ash sample obtained from a coal-fired power plant. $Fe_2O_3$, CuO and carbon black showed higher oxidation or adsorption efficiency for elemental mercury while CaO, MgO, CuO and carbon black showed higher adsorption efficiency for mercury chloride. In addition, the synthesized sample showed comparable mercury oxidation and adsorption efficiencies to the fly ash sample.

• Journal of the Korean Chemical Society
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• v.46 no.5
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• pp.444-456
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• 2002

To protect the occurrence of the oxidation of car body, we developed antioxidizing device made with sacrificial anode. Because car body is made of iron and iron-alloy and oxidation potential of Mg, Al and Zn is higher than that of iron, sacrificial anodes were made with Mg, Al and Zn. Accordingly, Mg, Al and Zn are better oxidizing than car body, iron and iron-alloy can be protected from oxidizing. We have made an antioxidizing device and evaluated their anti-corrosive effect for iron piece in the solution of hydrochloric, nitric and sulfuric acid using balance, SEM and XPS. When iron pieces were connected with antioxidizing device of car body, weight loss by oxidation was remarkably reduced and surface corrosion of iron piece was protected. It was shown that the surface of iron pieces which is not con-nected to the device was changed to iron(Ⅲ) oxide, Fe$_2$O$_3$. Therefore, if this device is attached to car body, corrosion and oxidation of car body will be reduced, considerably.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.40 no.8
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• pp.560-564
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• 2003

Thick oxide layer was fabricated by anodic reaction and complex oxidation performed by combining low temperature thermal oxidation (50$0^{\circ}C$, 1 hr at $H_2O$/O$_2$) and a RTO (rapid thermal oxidation) process (105$0^{\circ}C$, 1 min). Electrical characteristics of OPSL (oxidized porous silicon layer) were almost the same as those of thermal silicon dioxide prepared at high temperature. The leakage current through the OPSL of 20${\mu}{\textrm}{m}$ thickness was about 100 - 500 ㎀ in the range 0 V to 50 V. The average value of breakdown field was about 3.9 MV/cm. From the XPS analysis, surface and internal oxide films of OPSL prepared by complex process were confirmed completely oxidized and also the role of RTO process was important for the densification of PSL (porous silicon layer) oxidized at low temperature.

• Resources Recycling
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• v.9 no.5
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• pp.22-27
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• 2000

Iron oxide produced form the pickling process at the cold rolling mill in iron & steelmaking industry, use for raw material of electronic an colorant product. Recently, decreasing of the chlorine content in iron oxide is demanded at the market. In this study, under the field test of the spray roaster and the screw conveyer for dechlorination, the experiments of the chlorine content in iron oxide were investigated. From the results of experiment, the chlorine content in iron oxide can be reduced to 1,100 ppm from the spray roaster and, 383 ppm from the screw conveyer.

• 한국신재생에너지학회:학술대회논문집
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• 2006.11a
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• pp.396-398
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• 2006

PdPt/C (Pd:Pt atomic ratio of around 19:1 60wt, %) 촉매를 고분자전해질 연료전지용 전극 촉매소재의 적용하였다. PdPt/C 촉매를 산화극 촉매로, 환원극 촉매로는 Pt/C 촉매를 사용하고 반대로 산화극 촉매는 Pt/C 촉매, 환원극 촉매로는 PdPt/C 촉매를 사용했을 때, PdPt/C 촉매를 산화극과 환원극 촉매로 동시에 사용했을 때의 고분자전해질 연료전지의 단위전지 성능을 각각 비교하였다. PdPt/C촉매를 산화극에만 적용했을 때에 Pt/C 상용촉매를 산화극과 환원극에 모두 적용했을 때의 성능만큼 좋은 성능을 확인할 수 있었다. 환원극 촉매는 Pt/C를 사용하고 산화극 촉매를 PdPt/C Pt/C Pd/C를 사용하였을 매의 성능을 비교하였다. Pd/C를 산화극 촉매로 사용한 단위전지가 나머지 두 경우의 성능에 비하여 현저히 떨어짐을 확인할 수 있었다. 이는 극소량의 Pt 량을 포함한 PdPt/C 촉매가 고분자전해질 연료전지의 산화극 Pt/C 촉매의 대체촉매로 사용 가능함을 보여준다.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2017.05a
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• pp.843-848
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• 2017

Metal exposed to high temperature/high pressure/oxidizer-rich environment may cause rapid oxidation(ignition and combustion). In this study, a DC power supply test system that controls the temperature of specimen by supplying power to the specimen was constructed and after simulating the high temperature/stagnation/oxidizer-rich environment, the metal oxidation and ignition of STS series metal materials were evaluated. As a result, we was confirmed that the deformation (discoloration) of the selected material, the change in the surface roughness and the peeling of the metal surface were observed, and that the weight and the specimen thickness were changed. The most oxidized specimen was STS 304 and the less oxidized specimen was XM-19.

• Proceedings of the Korean Vacuum Society Conference
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• 2016.02a
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• pp.163.2-163.2
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• 2016

타이타늄과 탄소의 비율이 서로 다른 조건에서, 탄소가 도입된 산화타이타늄 (TiO2)을 수열합성법을 이용하여 합성하였다. TEM 이미지를 통하여 일정한 형태의 산화타이타늄이 합성된 것과, XRD 패턴 분석을 통하여 Anatase 형태임을 확인하였다. 본 연구에서는 탄소가 도입된 산화타이타늄을 이종상촉매로 사용하여 일차 및 이차 알코올 산화반응과 메틸렌 블루 분해 실험에 응용하였다.

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2004.05a
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• pp.320-323
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• 2004

두가지 처리방법을 연계처리하여 실험한 결과 펜톤산화를 전처리로 적용하여 실험한 경우가 COD와 Color의 제거면에서 더 높은 처리효율을 보이고 있으며 본 연구의 실험 목적인 RFP상의 수질기준을 만족하였다. 배출수 수질 기준이 강화된 RFP상의 수질기준을 만족하기 위한 고도산화방법의 연계처리방법 중 오존산화와 펜톤산화를 조합한 결과 유기물과 색도를 고루 제거하는 펜톤산화를 전처리 공정으로 적용하고 유기물의 제거보다는 색도제거에 더 효율적인 오존처리 공정을 후처리로 둔 조합공정이 더 적합한 것으로 판단된다.

• Proceedings of the Korean Nuclear Society Conference
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• 1998.05b
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• pp.41-47
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• 1998

플라즈마를 이용한 핵연료재료 건식처리 공정 기초연구로서 플라즈마 기체에 의한 U와 $UO_2$의 산화가속화 연구를 수행하였다. $UO_2$에서는 플라즈마를 사용할 경우 40$0^{\circ}C$에서 약 300%정도, 50$0^{\circ}C$에서는 70%정도의 산화가속화가 일어났으며 금속우라늄의 경우에는 35$0^{\circ}C$에서 50%정도의 산화가속화를 확인할 수 있었고 power가 증가함에 따라 산화량이 증가하는 것을 알 수 있었다. 한편 전체적인 실험 결과가 시간에 따라 산화량이 선형적으로 증가하는 것으로 나타나 400~50$0^{\circ}C$에서는 표면반응이 중요한 반응이라는 것을 확인하였다.