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용융염 LiCl-Li_2O-Li_3N에서 316LN SS의 용접부 부식거동
조수행,홍순석,신영준,박성원 한국공업화학회 2003 응용화학 Vol.7 No.1
In the development of the advanced spent fuel management process based on the molten salt technology, it is essential to choose the optimum material for the process equipment handling molten salt. As a part of assessment and application of the strutural material for the molten salt handling system, corrosion behavior of 316LN ss weld in the molten salts was investigated. In a molten salt of LiCI-Li_2O, the oxide scales of LiCrO_2 and Li_4M_0O_5 were formed at the rate of similar linear kinetics. But in the molten salt of lI-Li_2O-Li_3N, the oxide and nitride scales of Li_4M_0O_5 and M_02N were formed at the rate of simliar linear kinetics. The corrosion rate of 316 LN ss in the molten salt of LiCI-Li_2O was lower than that in the molten salt of LiCI-Li_2O-Li_3N.
고온 리튬용융염계에서 오스테나이트 스테인레스강의 부식거동
조수행,홍순석,오승철,박성원 한국공업화학회 2003 응용화학 Vol.7 No.2
In the development of the advanced spent fuel management process based on the molten salt technology, it is essential to choose the optimum material for the process equipment handling molten salt. As a part of assessment and application of the structural material for the molten salt handling system, corrosion behavior of 304, 304L and 316LN in the molten salts was investigated. Corrosion proceeded via three steps; the formation step on corrosion product in which rapid corrosion takes place until stable corrosion product is formed after the beginning of corrosion, the protection step against corrosion until breakaway occurs after the formation step of stable corrosion product and the advancing step of corrosion after the breakaway. In a molten salt of LiCl-8%Li₂O, the final oxide scales of Li₂Ni_(8)O_(10) were formed, and also Li₂Ni_(8)O_(10) in the molten salt of LiCl-8%Li₂O-1%Li_3N.
조수행,윤기석,임종호,박성원 대한금속재료학회 2004 대한금속·재료학회지 Vol.42 No.10
In the development of the advanced spent fuel management process based on the molten salt technology, it is essential to choose the optimum material for the process equipment handling molten salt. The corrosion behaviors of 304 S.S., 321 S.S., 316 LN S.S. and Incoloy 800 H in a molten salt of LiCI-Li₂O were investigated in the temperature range of 650-800℃. The oxide scales consisting of Fe₃O₄i FeCr₂O₄and Cr₂O₃ were formed in the 304 S.S., 321 S.S., 316 LN S.S. and Incoloy 800 H regardless of reaction temperature and time. The order of corrosion rate was Incoloy 800 H < 316 LN S.S. < 321 S.S. < 304 S.S.. Incoloy 800 H showed uniform corrosion behavior, whereas 304 S.S., 321 S.S. and 316 LN S.S. showed intergranular corrosion behavior. Incoloy 800 H with high Ni content exhibited the highest corrosion resistance among the examined alloys. (Received February 27, 2004)
조수행,홍순석,오승철,박성원 한국공업화학회 2004 응용화학 Vol.8 No.1
In the development of the advanced spent fuel management process based on the molten salt technology, it is essential to choose the optimum material for the process equipment handing molten salt. As a part of assessment and application of the structural material for the molten salt handing system, corrosion behavior of Fe-base and Ni-base alloys in the molten salts was investigated in the temperature range of 650~800℃. Ni-base alloys showed of FeCr₂O₄ and Cr₂O₃ were formed in the Fe-abse alloys, also, NiFe₂O₄ and Cr₂O₃ in the Ni-base alloys. Fe-base alloys showed uniform and intergranular corrosion behavior and Ni-base alloys showed uniform and localized corrosion behavior.
GIS의 활용을 위한 가로수 DB 모형 개발의 개념적 설계방안
곽행구,조영환,김용수 木浦大學校 沿岸環境硏究所 1998 沿岸環境硏究 Vol.15 No.1
Various idea of conceptional design of GIS database of street tree of Gum Nam Ro in Kwangju emphasizing location information which is significant for tree manager were compared and analyzed for efficient open space management. The results obtained were as follows. First, the information of location is essential for tree manager based on the findings of the comparative analysis of 3 conceptional design of street tree database. Second, elements of street database except tree location were path, landmark, node, direction, block, district and building. Tree managers differently recognized these elements according to the direction and interrelation of location. Third, ranking of these elements were based on the comparative analysis of 3 conceptional designs. The distance between a targeted tree, a street node and perpendicular line of streets were very important for finding out the location of a targeted tree. Thus, the database which can discover effectively the direction, distance and location of street trees can help to improve the efficiency of timely tree management.
Hot corrosion behavior of magnesia-stabilized ceramic material in a lithium molten salt
Cho, Soo-Haeng,Kim, Sung-Wook,Kim, Dae-Young,Lee, Jong-Hyeon,Hur, Jin-Mok Elsevier 2017 JOURNAL OF NUCLEAR MATERIALS Vol.490 No.-
<P><B>Abstract</B></P> <P>The isothermal and cyclic corrosion behaviors of magnesia-stabilized zirconia in a LiCl-Li<SUB>2</SUB>O molten salt were investigated at 650 °C in an argon atmosphere. The weights of as-received and corroded specimens were measured and the microstructures, morphologies, and chemical compositions were analyzed by scanning electron microscopy, X-ray energy dispersive spectroscopy, and X-ray diffraction. For processes where Li is formed at the cathode during electrolysis, the corrosion rate was about five times higher than those of isothermal and thermal cycling processes. During isothermal tests, the corrosion product Li<SUB>2</SUB>ZrO<SUB>3</SUB> was formed after 216 h. During thermal cycling, Li<SUB>2</SUB>ZrO<SUB>3</SUB> was not detected until after the completion of 14 cycles. There was no evidence of cracks, pores, or spallation on the corroded surfaces, except when Li was formed. We demonstrate that magnesia-stabilized zirconia is beneficial for increasing the hot corrosion resistance of structural materials subjected to high temperature molten salts containing Li<SUB>2</SUB>O.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Corrosion mechanism of MSZin LiCl-Li<SUB>2</SUB>O molten salt is proposed. </LI> <LI> Formation of Li<SUB>2</SUB>ZrO<SUB>3</SUB>is main corrosion mechanism. </LI> <LI> There were no cracks, pores and spallation after corrosion test. </LI> <LI> MSZ shows high corrosion resistance to LiCl-Li<SUB>2</SUB>O molten salt. </LI> </UL> </P>
Corrosion Behavior of Ni-Base Alloys in a Hot Lithium Molten Salt under an Oxidizing Atmosphere
( Soo Haeng Cho ),( Il Je Cho ),( Gil Sung You ),( Ji Sup Yoon ),( Seong Won Park ) 대한금속재료학회 ( 구 대한금속학회 ) 2007 METALS AND MATERIALS International Vol.13 No.4
The electrolytic reduction of a spent oxide fuel involves the liberation of the oxygen in molten LiCl electrolyte, which is a chemically aggressive environment that is excessively corrosive for typical structural materials. Accordingly, it is essential to choose the optimum material for the processing equipment that handles the molten salt. In this study, the corrosion behaviors of Haynes 263, Haynes 75, Inconel 718 and Inconel X-750 in a molten LiCl-Li2O salt under an oxidizing atmosphere were investigated at 650 ℃ for 72 to 216 hrs. The Haynes 263 alloy showed the best corrosion resistance among the examined alloys. The corrosion products of Haynes 263 were Li(Ni,Co)O2 and LiTiO2; those of Haynes 75 were Cr2O3, NiFe2O4, LiNiO2 and Li2NiFe2O4; while Cr2O3, NiFe2O4 and CrNbO4 were identified as the corrosion products of Inconel 718. Inconel X-750 produced Cr2O3, NiFe2O4 and (Cr,Nb,Ti)O2 as its corrosion products. Haynes 263 showed a localized corrosion behavior while Haynes 75, Inconel 718 and Inconel X-750 showed a uniform corrosion behavior.