DEVICE AND METHOD FOR MELTING A MATERIAL WITHOUT A CRUCIBLE AND FOR ATOMIZING THE MELTED MATERIAL IN ORDER TO PRODUCE POWDER

摘要

The invention relates to a device (1) for melting a material without a crucible and for atomizing the melted material in order to produce powder, comprising: an atomizing nozzle (5); an induction coil (4) having windings (4a-d), which become narrower in the direction of the atomizing nozzle (5) at least in some sections; and a material bar (3) at least partially inserted into the induction coil (4). The induction coil (4) is designed to melt the material of the material bar (3) in order to produce a melt flow (16). The induction coil (4) and the atomizing nozzle (5) are arranged in such a way that the melt flow (16) is or can be introduced into the atomizing nozzle (5) through a first opening (20) of the atomizing nozzle (5) in order to atomize the melt flow (16) by means of an atomizing gas (19), which can be introduced into the atomizing nozzle (5). The device is characterized in that the atomizing nozzle (5) is designed in such a way that the atomizing gas (19) can be or is introduced into the atomizing nozzle (5) only through said first opening (20) of the atomizing nozzle (5); that the atomizing nozzle (5) is designed to accelerate the atomizing gas (19) at least up to the speed of sound of the atomizing gas (19) in a direction parallel to the melt flow (16); and that the material bar (3) and the induction coil (4) are arranged in such a way that the melt flow (16) can be or is inductively heated by the induction coil (4) before the melt flow (16) enters the atomizing nozzle (5). The invention further relates to a corresponding method for melting a material without a crucible and for atomizing the melted material in order to produce powder.

主权项

1. A device for the crucible-free melting of a material and for atomising the melted material for manufacturing powder, the device comprising
an atomisation nozzle; an induction coil with windings, which at least in sections become narrower in the direction towards the atomisation nozzle; and a material rod which is introduced at least partly into the induction coil; wherein the induction coil is configured to melt the material of the material rod for producing a melt flow; and wherein the induction coil and the atomisation nozzle are arranged in a manner such that the melt flow can be introduced or is introduced into the atomisation nozzle through a first opening of the atomisation nozzle, for the atomisation of the melt flow by way of an atomisation gas which can be introduced into the atomisation nozzle,and wherein
the atomisation nozzle is configured such that the atomisation gas can only be introduced or is only introduced into the atomisation nozzle through the mentioned first opening of the atomisation nozzle; that the atomisation nozzle is configured to accelerate the atomisation gas in a direction parallel to the melt flow, at least up to the speed of sound of the atomisation gas; and that the material rod and the induction coil are arranged in a manner such that the melt flow is inductively heatable or heated by the induction coil, before entry of the melt flow into the atomisation nozzle.