Study On The Filamentization During Melt-Extraction Of CoFeSiB Alloy

As a result of the excellent magnetic and mechanical properties, melt extracted amorphous wires have been widely used for potential industrial application. During melt extraction process, the filamentization property is determined by the wetting and puddle properties, as a result to affect the property and application of amorphous wires. So it plays an important role in industry application to study on the filamentization property during melt extraction.This paper bases on the Mass Conservation Equation, Momentum Conservation Equation, Energy Conservation Equation and the specially process condition of melt extraction technique, which is combined with the characteristic of flow function, found the 2D wetting model during the melt extracting. The influence of different heat transmission and momentum transmission parameters on the wetting property is analyzed. The Fluent software is applied to simulate its puddle property. By altering concerned parameters, the influence of wheel and basic process parameters to puddle property is investigated in detail. The simulation results indicate that it can forecast the defects of melt extracted amorphous wires, and can be compared with the experiment data.The wettability of different wheel: copper wheel (less than molybdenum wheel) less than 45# steel wheel consists with static wetting result. The wettability remains as a constant if changing the static wettability between the wheel surface and molten alloy only, so do the temperature and velocity in the puddle. By enhancing the thermal conductivity of wheel, the temperature and the wettability will decrease. It can be obtained much better wettability with an increase of the wheel velocity, the decrease of the puddle length and thickness of the extracted layer. The amorphous wires will form Rayleigh waves defect on the surface when the wheel velocity is low. The molten layer becomes discontinuous with the high wheel velocity easily. The feed rate does not play a important role in the temperature and velocity distribution. The increasing temperatures of the puddle and the molten can effectively improve the wetting behavior during melt extraction process.