Apparatus and method of making filaments

摘要

An improved apparatus and method for making solid filamentary elements from a pendant drop of a high melting point material (e.g. hafnium, zirconium). The improvement constitutes providing a protective layer in the form of a thin film on the circumferential edge of the casting wheel prior to engagement of the drop and release of the elements. The layer material serves to reduce heat flow from the drop material to the wheel as well as prohibit bonding of the drop material thereto. The preferred layer materials are aluminum, carbon (e.g. graphite), boron nitride, and borosilicate glass.