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TiAl합금의 Al 피복시 Al확산 피복층의 내고온산화성
이철형,최진일 ( C . H . Lee,J . I . Choe ) 한국열처리공학회 1997 熱處理工學會誌 Vol.10 No.2
The effect of variation of pack activators, compositions, temperature and time on the thickness and structure of aluminide coatings formed on the TiAl alloy was studied in one-step packs and two-step packs containing aluminum for the purpose of improvement of oxidation resistance. The thickness of coating layer was increased with increasing NH₄Cl content up to 3wt% and then it was saturated. Oxidation resistance of coating layers carried out at one step pack was superior to that of ones through of two step pack. The improvement of high temperature oxidation resistance was due to the formation of a protective Al₂O₃ surface layers and coating the alloys with TiAl₃phase.
이철형(Lee, C. H.),박완순(Park, W. S.) 한국신재생에너지학회 2005 한국신재생에너지학회 학술대회논문집 Vol.2005 No.06
The Kaplan turbine model has been tested and analyzed. The blade angle and the guide vane opening of the turbine model were designed to be varied according to the best combination of guide vane and runner blade opening. When the changes in head and output were comparatively large, the efficiency drop were small, so the efficiency characteristics and stability of the entire operating condition were maintained in good condition. These results showed that the developed model in this study will be suitable for small hydro power stations with large changes in head and load.
이철형(C. H. Lee),박완순(W. S. Park) 한국유체기계학회 2005 유체기계 연구개발 발표회 논문집 Vol.- No.-
A model, which can analyze the hydrological performance for small hydropower(SHP) plants having no flow duration characteristics has been studied and developed. System performance of existing SHP plant under operating was analyzed by using the developed model. The annual operational rate of SHP plant showed that the data were in good agreement with predicted results from the model. Based on these results, several SHP sites to be exploited were selected and the performance characteristics were analyzed by using the developed model. Also, primary design values such as design flow rate, plant capacity, and operational rate were suggested. As a result, it was found that the methodology used in this study is useful tool to predict the hydrological system performances of SHP sites.