Powder-bed-based additive manufacturing process
The present disclosure relates to powder-bed-based additive manufacturing processes. Embodiments thereof may include methods for producing a component from a superalloy. For example, a method for producing a component comprising a superalloy may include: preheating a powder bed comprising particles of a core material coated by a ceramic layer, the core material including alloying constituents of the superalloy and building up the component layer by layer in a powder bed by melting particles with an energy beam. The powder bed may be heated to a temperature below a melting point of the core material before the particles are melted.
1. A method for producing a component comprising a superalloy, the method comprising:
preheating a powder bed comprising particles, wherein each particle comprise a core material coated by a ceramic layer, the core material including alloying constituents of the superalloy;
wherein the powder bed is heated to a temperature below a melting point of the core material; and
building up the component layer by layer in a powder bed by melting particles with an energy beam;
wherein the superalloy is defined by a target alloy constituent composition for each respective alloying constituent.
2. The method as claimed in claim 1 , wherein the ceramic layer contains metals comprising an alloying constituent of the superalloy.
3. The method as claimed in claim 2 , wherein an alloy constituent content of the core material is below the target alloy constituent composition and an alloy constituent content of the ceramic layer is above the target alloy constituent composition by a corresponding amount.
4. The method as claimed in claim 1 , wherein the ceramic layer comprises an oxidic or nitridic ceramic.
5. The method as claimed in claim 1 , wherein the ceramic layer has a thickness of at least 1 nm and at most 20 nm.
6. The method as claimed in claim 1 , wherein the particles in the powder bed have a particle size of at least 10 μm and at most 50 μm.
7. The method as claimed in claim 1 , wherein the superalloy comprises a nickel-based superalloy.
8. The method as claimed in claim 7 , wherein the temperature of the powder bed is at least 800° C. and at most 1000° C.
9. The method as claimed in claim 7 , further comprising cooling the component at a rate of at most 1° C. / s.
10. The method as claimed in claim 1 , wherein the ceramic is selected from the group consisting of: aluminum oxide, titanium oxide, silicon oxide, zirconium oxide, yttrium oxide, and aluminum nitride.