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최주,이종근,최승주 대한금속재료학회(대한금속학회) 1981 대한금속·재료학회지 Vol.19 No.7
Trials were made to develop gamma prime precipitation hardened nickel-base superalloys which have both excellent creep rupture strength and hot corrosion resistance. The factors which influence high temperature characteristics were expressed a function of alloy composition by means of multiple regression analysis. Setting certain conditions on the factors, alloy composition was calculated with use of the computer. The alloys developed by this method are proved to be excellent in creep rupture strength and sulfidation resistance.
모나자이트로부터 분해회수한 희토류화합물을 이용한 폐수중 불소처리
최우진,표나영,김동수,전영신,최주 이화여자대학교 환경문제연구소 1998 이화환경연구 Vol.2 No.-
회토류 혼합산화물의 무기산에 대한 반응성을 혼합 희토류산화물의 주성분인 La₂O₃와 CeO₂에 대해 산의 농도와 종류, 반응시간, 온도등을 변수로 하여 검토하였다. 산의 농도와 종류에 따른 반응성에서는 La₂O₃의 경우 황산, 염산, 질산 모두에 대해 낮은 농도에서도 높은 반응성을 보였으며, CeO₂의 경우에는 황산에 대해서만 반응성을 보였다. 반응신간에 따른 반응성 변화에서는 시간의 증가에 따라 반응률 증가량은 크지 않았으며, 반응온도 증가의 경우에도 반응성에 대한 영향은 크지 않았다. 혼합 희토류산화물 수용액을 불소함유 폐수에 적용시켜 불소 제거 효과를 관찰하였으며, 처리수의 pH변화시에 대한 효과적 처리방안도 강구하였다. 또한 불소함유 폐수 처리시 발생하는 잔사를 처리해 산 가용성 희토류염을 회수하여 재활용하는 방안에 대해서도 검토하였다. The reactivity of mixed rare earth oxides, focusing on La₂O₃and CeO₂ with several mineral acids has been studied depending on acid-concentration, reaction time, and temperature. La₂O₃ showed a high reactivity with H₂SO₄, HCL and HNO₃even at low concentration, but CeO₂showed a discernable reactivity only with H₂SO₄. In the reactivity change according to the reaction time , the reactivity in()rement as time increases was not so big and the same was observed in the increase of reaction temperature. The application of mixed rare earth oxide solution for the removal of fluorine in wastewater was investigated and influential treatment process for the pH change of once-treated wastewater was also studied. We also examined a method in retreating the sludge that occurs during the treatment process in order to recover the acid-soluble rare earth salt.
이상헌,오규환,임창희,박중길,한흥남,최주,이동녕 대한금속재료학회(대한금속학회) 1997 대한금속·재료학회지 Vol.35 No.1
Thermal deformation of slab mold during continuous casting was analysed by the coupled finite element method with heat and thermo-elasto-plastic deformation. In order to consider the effect of air gap on the heat transfer coefficient between strand and mold, thermal deformation of strand and temperature distributions in strand and mold were calculated. The effects of mold thickness, temperature of cooling water, velocity of cooling water and mold taper on deformation of mold was investigated. The deformation of mold was due to the difference of thermal expansion between mold and supporting plate of mold. During heating in continuous casting process, mold was deformed toward the strand, while mold was deformed toward the supporting plate of mold during cooling. The amount of deformation increased with increasing the hot face temperature in mold.