Horno de arco para fabricar vidrios metálicos masivo

Abstract

Se persigue dise~nar un horno de arco para la fabricaci on de aleaciones met alicas v treas masivas mediante la fusi on de la aleaci on madre y su posterior succi on a moldes cil ndricos de dimensiones de 3 a 20 mm de di ametro y de 20 a 50 mm de longitud. El horno estar a compuesto de un hogar de cobre (de muy bajo contenido en ox geno) en el que se funden los constituyentes de la aleaci on alcanzando temperaturas de hasta 2500ºC, mediante corriente el ectrica (alterna) de hasta 150 amperios. El sistema debe mantener una atm osfera controlada, bien vac o (al menos 10 microbar) bien atm osfera de arg on puro en sobrepresi on de hasta 0.5 bar. La fusi on se realizar a mediante un electrodo de cobre, acabado en punta de tungsteno, que pueda girar en su habit aculo 15º respecto de la vertical y desplazarse distancias de hasta 50 mm, para alcanzar diferentes posiciones en el hogar de cobre. Tanto el hogar como el electrodo y su recipiente deben estar refrigerados por agua, este ultimo en circuito cerrado.

An arc-melting furnace has been designed to produce bulk metallic glasses. The fabrication is achieved by arc-melting the mother alloy and subsequent suctioning into appropriate cylindrical copper molds. Their diameter ranges from 3 to 200 mm and their length is 50 mm. The furnace is comprised of a copper hearth onto which pieces of the material constituents, in appropriate weight ratios for a given chemical composition, are melted to produce rstly the mother alloy. Temperatures reaching up to 2500ºC should be attained by arc-melting with alternating currents up to 150 amps. The system should be under controlled atmosphere: a vacuum of at least 10 mbar and high purity argon gas overpressures up to 0,5 bar. Arc-melting is achieved by means of a copper electrode that should be able to rotate away from the vertical axis by 15º and translate axial (upwards and downwards) distances up to 50 mm, in order to reach di erent locations at the copper hearth. This together with the electrode should be refrigerated by running water, the latter in a closed circuit