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김성균,김동익,최회진 대한금속재료학회(대한금속학회) 1995 대한금속·재료학회지 Vol.33 No.7
A new process for the metal fiber production by the powder extrusion has been developed. Being compared with the conventional processes, such as the bundle drawing method, the shatter machining method and the in-rotating water melt spinning method, the process has two distinctive advantages. One is that the fibers having a diameter below l0㎛ can be easily manufactured, the other is that the diameter, the length and the cross-sectional shape of the fibers can be controlled easily by the selection of the diameter of initial metal powders, extrusion ratios and extrusion die shapes. The silver fibers of 2㎛ wide and 30㎛ long and aluminum fibers of 5-10㎛ wide 1-3㎜ long were demonstrated.
김성균,나형용,김동익,최회진 대한금속재료학회(대한금속학회) 1994 대한금속·재료학회지 Vol.32 No.10
The steady state shapes of solid-liquid interface under various conditions, during directional solidification of pure materials between two straight walls, were calculated by numerical analysis. The transition from the interface shapes governed by the interface energy to that governed by the mobility can occur as the pulling rate changes. At a high pulling rate where the interface shapes are governed by the mobility anisotropy, there is a critical mobility anisotropy above which the faceted interface appears. At a high pulling velocity and with a high mobility anisotropy, the faceted interface shapes depend on the wetting angle, ψ between the interface and the wall only at the range of π/4$lt;ψ$lt;5π/4. At the other range of wetting angle the macroscopic interface shape is independent of the wetting angle. The faceted interface can be composed of the planes with high crystallographic indices if the mobility anisotropy, at the high pulling velocity, is slightly larger than the critical value or if the wetting angle, at the high pulling velocity and with the high mobility anisotropy, is at a range of π/4$lt;ψ$lt;π2.