| 학회 | 한국재료학회 |
| 학술대회 | 2006년 봄 (05/19 ~ 05/20, 경상대학교 ) |
| 권호 | 12권 1호 |
| 발표분야 | 제 10회 신소재심포지엄 |
| 제목 | Ostwald ripening theory on evolution of foamed metal structure |
| 초록 | Foamed metal is usually produced by two methods, powder metallurgy and melt foaming. Especially, the melt foaming method, addition of a foaming agent to the molten metal is useful for the commercial production of foamed aluminum due to the low cost and the wider industrial application. However this method has a difficulty to produce higher porosity with finer pores because the evolution of pore cannot be avoided during the whole process. In order to control the situation a lot of experimental works and the analysis have been reported already but the theoretical understanding is not sufficient enough. In this study, at first we introduce Ostwald ripening theory on the pore evolution because gas element like hydrogen can diffuse from one pore to another easily thorough the thinner walls of liquid at high temperature. One of the authors had developed the generalized formula of Ostwald ripening that can be applied not only to particles in solid but also gas pores in liquid. Ostwald ripening is a basic evolution process that larger particles or pores grow and smaller ones shrink so as to decrease the total interfacial energy between matrix and particles or pores. Therefore, if the calculation results of Ostwald ripening for pore evolution in melt are in agreement with experimental results, the theory should be given higher priority than any other like a coalescence theory. We show the good agreement between theory and experiments first. |
| 저자 | H. Arai |
| 소속 | Nippon Metal Industry Co. Ltd |
| 키워드 | |
