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Gd₂O₃doped CeO₂의 소결성에 미치는 Al₂O₃의 첨가효과
최광훈,이주신 경성대학교 공학기술연구소 2002 공학기술연구지 Vol.9 No.-
The effect of Al_2O_3 addition on sintering behavior of 10 mol% Gd_2O_3 doped CeO_2 was systematically investigated from the following aspects: the variation in sintering density, the variation in grain size, and the forms and existence position of Al_2O_3 in CeO_2. Sintering density increased up to 2 mol% Al_2O_3 addition, and then it decreased. Grain size increased up to 2 mol% Al_2O_3 addition also. Over 2 mol% Al_2O_3 addition, grain size was decreased by a pinning effect of AlGdO_3 precipitation at grain boundary. Lattice constant decreased with increasing Al_2O_3 content up to 2 mol%. This decrease will be due to the substitution of smaller Al^3+ ions for Ce^4+ ions in the CeO_2 structure. According to the result of SEM and XRD analysis, the solubility limit of Al_2O_3 in 10 mol% Gd_2O_3 doped CeO_2 can be estimated to be nearly 2 mol%. The addition of Al_2O_3 up to solubility limit was found to promote the sintering properties.
Gd₂O₃-doped CeO₂의 소결성에 미치는 Gd₂O₃의 첨가효과
최광훈,이주신 경성대학교 공학기술연구소 2003 공학기술연구지 Vol.10 No.-
The effects of Ga₂0₃ additions on sintering behavior of Gd₂0₃-doped CeO₂ were systematically investigated from the following aspects: the variation in sintered density, the variation in grain size, and the forms and existence position of Ga₂0₃ in Ce0₂. Sintered density increased up to 5 mo1% Ga₂0₃ addition, and then it decreased. Grain size increased up to 5 mo1% Ga₂0₃ addition also. Over 5 mol% Ga₂0₃ addition, grain size was decreased by a pinning effect of Ga₂0₃ precipitation at grain boundary. Lattice constant decreased with increasing Ga₂0₃ content up to 5 mol%. This decrease will be due to the substitution of smaller Ga^(3+) ions for Ce^(4+) ions in the Ce0₂ structure. According to the results obtained from SEM and XRD analyses, the solubility limit of Ga₂0₃ in Ce_(0.8)Gd(0.2)0_(1.9) ceramics can be estimated to be nearly 5 mol%. The addition of Ga₂0₃ up to solubility limit was found to promote the sintering properties.
특집 2 - 환절기 사양관리 포인트 -환절기 종계 사양관리 중점 포인트 _기온 편차에 적응할 수 있는 적정 환기 실시
최광훈,Choe, Gwang-Hun 대한양계협회 2011 월간 양계 Vol.43 No.9
국내에서 양계를 사양하기 어려운 조건 중 하나가 계절적 요인이라 할 수 있겠다. 4계절이 있는 국내에서 양계 사양관리는 계절변화 요인이 적게 나타나는 동남아와 일부 유럽에 비하여 관리하기 까다로운 것이 사실이다. 국내기후는 건실한 시설과 그에 맞는 관리를 요구하는 환절기가 존재하여 생산성에 영향을 주고 있다고 표현하는 것이 맞는 것 같다. 환절기 사양관리 중에 주의해서 관리해야 할 사항 중 제일 중점적으로 점검해야 할 사항이 환기가 아닌가 한다.
대구광역시 지하상업공간의 에너지 소비 실태 조사에 관한 연구
최광훈,원안나,홍원화 대한건축학회 2001 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.21 No.2
As the korean economy and society continue to develop, the cumber of underground commercial spaces are expected to increase. This increase will demand greater heating and cooling energy as well as a sharp rise in overall energy consumption. This study was aimed at the development of energy conservation and analyzed for 2 underground commercial spaces. This study shows the information, that is, tables, graphs and charts as possible of the trend in energy efficiency in underground commercial spaces between 1999 and 2001.6. We suggested the practical application for energy conservation methods and efficient energy use which was based on the investigations and analyses.
Strontium gallate의 첨가에 따른 Gd_(2)O_(3)-doped Ceo_(2) 세라믹스의 소결특성
최광훈,이주신 경성대학교 공학기술연구소 2004 공학기술연구지 Vol.11 No.-
The densification behavior of Ce_(0.8)Gd_(0.2)O_(1.9) ceramics was investigated with the strontium gallate concentration ranging from 0 to 5 mol%. Sintered density was the highest at the specimen containing 0.5 mol% Sr_(2)Ga_(2)O_(5). 0.5 mol% Sr_(2)Ga_(2)O_(5)-added specimen had the relative density of 97%. Overall, sintered density of specimens containing Sr_(2)Ga_(2)O_(5) was higher than that of pure specimen. Sr_(2)Ga_(2)O_(5) addition gave good effect on sinterability of Gd_(2)O_(3)-doped CeO_(2).