Method for producing a powder
AssigneeApplikations - und Technikzentrum fur Energieverfahrens- Umvelt- und Stromungstechnik (Atz-Evus)
InventorGerhard Wolf
Life of this patent
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Abstract
A method for producing a powder by pulverizing a stream of molten metal using a pulverization gas, which directly hits the molten metal stream, whereby a) a reactive gas is used as the pulverization gas such that a compound is formed by the reaction of the pulverization gas with the metal or an alloy component thereof and b) the temperature of the pulverization gas and the cooling speed are set such that the metal or the alloy component thereof is converted into the compound, to a substantial degree completely, in one step.
Claims18
A process for producing a powder by atomizing a jet of molten metal by means of an atomization gas which comes into contact with the jet, comprising the steps of:
- a) using a reactive gas as the atomization gas so as to form a compound by reacting the atomization gas with the metal or an alloying constituent thereof, said compound being in the form of fine particles;
- b) setting a temperature of the atomization gas and a cooling rate such that the temperature of the atomization gas, when said atomization gas comes into contact with the jet, is at least 0.3 times a melting point, in ° C., of the metal and the cooling rate is less than 102 K/s, so that the metal or the alloying constituent thereof is substantially completely converted into the compound in one step, and the particles formed have a substantially homogenous composition consisting essentially of the compound through their entire cross section;
- and,
- c) cooling the particles after the compound has been formed.
Dependencies are inferred from the claim text.