PRODUCTION OF NI-BASE SPHERICAL AMORPHOUS METAL GRAIN

摘要

PURPOSE:To make mass production of Ni-base spherical amorphous metal grains of large grain sizes which are extremely industrially advantageous by continuously pouring a specifically composed Ni alloy from a molten state into cooling water which is kept rotated in a specified direction by a stirrer. CONSTITUTION:The melt of the alloy consisting, by atom%, 12-25% P, 0.1-76% =1 kinds among platinum group elements Pd, Pt, Ir, Rh, Ru, and Os and the balance Ni is filled into a furnace body 1. A nozzle 2 is attached to the base of the furnace body 1 and the molten metal is pressurized by gase ous Ar from the top surface. A cooling tank 3 contains the cooling water which is kept stirred by the stirrer 4 so as to rotate at a prescribed flow rate. A stopper of the nozzle 2 is opened in this state to pour the molten metal into the cooling water at a prescribed gushing flow rate. The Ni-base spherical amorphous metal grains are easily produced in a large quantity by the above- mentioned method. The resulted metal grains have good sphericity, large grain sizes and grain size distribution of small variance are thus obtd.