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연성금속 분말의 건식 볼 밀링에 있어서 구상형입자의 형성
이길근,박익민,정해용,도변용삼 대한금속재료학회(대한금속학회) 1995 대한금속·재료학회지 Vol.33 No.7
As a model experiment, Cu powders were ball-milled in a tumbiling mill in order to investigate the morphological evolution of ductile metal powder during mechanical alloying. The change of particle morphology was studied by microscopic observations. The particle morphology of Cu powders changed from dendritic particles of feed metals to disk-shaped particles, and then to globular purticles, which was similar to the observation during mechanical alloying of the premix of ductile intemetalic systems. It was found that the morphological change was due to the pure mechanical effect rising from collsions between the tools and powders. The globular particles were formed by the characteristic agglomeration of disik-shaped particles, that is, enclosure, folding, infolding and file-up process. It was also found that the globular particies coarsened by agglomeration and/or by continuous wrapping of the disk-shaped particles.
연성금속분말의 기계적합금화에 있어서 분말입자의 응집과 코팅현상
이동원,이길근,박익민,하국현,도변용삼,김병기 대한금속재료학회(대한금속학회) 1996 대한금속·재료학회지 Vol.34 No.10
Using Cu, Al and Ti powder as model materials, milling experiments were carried out to investigate the particle coagulation and coating on balls surface and or mill container wall during mechanical alloying of ductile metal powders. The change in particle number per unit weight during milling was analyzed as a function of particle coagulation and coating by Gillespie-Langstroth coagulation ratio equation which is based on probability theory. In the initial milling stage, the decrease in particle number was found to be due mainly to the particle coagulation. As the milling time increase, however, the contribution of the particle crating dominated the particle number decrease. It has been demonstrated that the particle coagulation and coating during milling occurred easily with increasing the ductility of metal power.