Numerical and Analytical Modeling of Free-Jet Melt Spinning for Fe75−Si10−B15 (at. %) Metallic Glasses

Abstract

Amorphous fiber, ribbon, or film is produced through melt spinning. In this manufacturing process, a continuous delivery of amorphous material is simultaneously dependent on the wheel spinning rate, metallic liquid viscosity, surface tension force, heat transfer inside the melt pool and along the substrate, and other parameters. An analysis of a freejet melt spinning for fiber manufacture has been performed to relate the process control parameters with amorphous formation. We present a numerical simulation of transient impingement of a free melt jet with a rapidly rotating wheel, along with theoretical estimates of melt ribbon thickness, to investigate dynamical characteristics of the flow in melt pool. The nucleation temperature and the critical cooling rate are predicted in the paper for alloy Feys-Siio-Bjs (at. %). Thermal conduction is found to dominate undercooling in melt spinning by comparing the temperature and velocity measurements with our numerical simulation and the analytical solutions.

Cooling Roller Steady-state Heat Flux and Temperature Analysis in Amorphous Ribbon Preparing Process

“…In PFC process, a large amount of high temperature melt conduct heat transfer to the cooling roller resulting in cooling roller outer wall temperature rising sharply, which can affect roller cooling capacity and amorphous ribbon quality. Thus, in order to produce high quality amorphous materials, it is necessary to analyze influencing factors of cooling roller temperature and select the suitable parameter to keep cooling roller temperature within a specified range [4][5][6][7][8] . One of the key boundary conditions acting on cooling roller outer wall is heat flux.…”