The effect of the main processing parameters on the geometry of amorphous metal ribbons during planar flow casting (PFC)

Abstract

Experimental work on PFC performed with some amorphous alloys is reported. The subject of the investigation is the relationship between the main processing parameters and the resulting ribbon thickness. Calculations applying Bernoulli's equation reveal the relationship between the ribbon thickness and substrate velocity, ejection pressure, nozzle slot breadth and crucible wheel gap distance. Empirical data from numerous experiments are in good agreement with the calculations. Ribbons with smooth surfaces and precise cross-sections can be obtained by melt spinning with a small gap distance. The efficiency of a constrained melt puddle on the ribbon surface was exhibited by topographic measurements and high-speed motion pictures. Results of surface tension measurements have been used to explain the effect of the melt temperature on the ribbon thickness. Calculations and experimental data are a base for practical use of the PFC process in the production of ribbons with predetermined precise cross-section.