Abstract: To produce metal powders by rotary atomization molten metal is poured onto the surface of a spinning disk. The central portion of the disk is ceramic. Onto the upper surface of the ceramic portion is bonded a protective layer of metal compatible with the molten metal to be poured. The molten metal is poured directly onto this metal layer which prevents contact with the ceramic. The metal of the protective layer is selected such that proper atomization and no significant contamination of the atomized metal occurs during a run.

Abstract: An atomizer disk for use in the process of making metal powder by pouring molten metal onto the spinning disk is made from a plurality of contiguous, concentric, radially aligned elements having thermal conductivity properties which are selected to achieve appropriate temperature zones on the surface of the disk during operation. The central disk-like element is preferably a ceramic with low thermal conductivity. The outermost element is a high strength reinforcing ring which preferably also has high thermal conductivity. The annular elements between the outer ring and central disk should also have high thermal conductivity. By properly selecting the disk materials the heat extraction from the molten metal can be better controlled and larger disks may be constructed.

Abstract: A method is set forth wherein powder is produced by melting metal in a melting furnace where it is then poured into a tundish which directs the molten metal onto a spinning disc means. The tundish is located at the center of a nozzle plate which contains a plurality of annular nozzle means for directing a coolant flow downwardly around the spinning disc means at different radial positions. Controls are provided for controlling atmosphere in said apparatus. Further, controls are provided to control the speed of the disc means and the mass flow of the cooling fluid through each of the nozzle means.