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US 2022/0023941 A1Published application
Metal powder for 3d-printing
AssigneeTaniobis GmbH
InventorsMARKUS WEINMANN, HOLGER BRUMM, CHRISTOPH SCHNITTER, MELANIE STENZEL
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Abstract
The present invention relates to metal powders which are suitable to be employed in 3D printing processes as well as a process for the production of said powders.
Claims26
1-25. (canceled)
26:
- A metal powder suitable for use in a 3D printing process, the metal powder comprising:
- a metal selected from the group consisting of tantalum, titanium and niobium, and alloys of tantalum, titanium and niobium,
- wherein,
- particles of the metal powder comprise an average aspect ratio ΨA of from 0.7 to 1, and
- ΨA=xFeret min/xFeret max.
2 more elements
27:
- The metal powder as recited in claim 26, wherein the metal powder comprises an alloy of titanium and niobium.
28:
- The metal powder as recited in claim 27, wherein the alloy further comprises tantalum.
29:
- The metal powder as recited in claim 26, wherein the metal powder comprises a metal alloy of titanium, niobium and tantalum.
30:
- The metal powder as recited in claim 26, wherein the metal powder further comprises:
- a tap density of 40 to 80% of a theoretical density of the metal powder, each determined according to ASTM B527.
31:
- The metal powder as recited in claim 26, wherein the metal powder further comprises:
- a flowability of less than 25 s/50 g, determined according to ASTM B213.
32:
- The metal powder as recited in claim 26, wherein the metal powder further comprises:
- a particle size distribution D10>2 μm,
- a particle size distribution D90<80 μm, and
- a particle size distribution D50 of 20 to 50 μm,
- each determined according to ASTM B822.
2 more elements
33:
- The metal powder as recited in claim 26, wherein the metal powder further comprises:
- a particle size distribution D10 of >20 μm,
- a particle size distribution D90 of <150 μm, and
- a particle size distribution D50 of 40 to 90 μm,
- each determined according to ASTM B822.
2 more elements
34:
- The metal powder as recited in claim 26, wherein the metal powder further comprises:
- a powder distribution D10 of >50 μm,
- a powder distribution D90 of <240 μm, and
- a powder distribution D50 of 60 to 150 μm,
- each determined according to ASTM B822.
2 more elements
35:
- The metal powder as recited in claim 26, wherein a level of oxygen in the metal powder<3,000 ppm.
36:
- A process for producing the metal powder as recited in claim 26, the process comprising:
- pressing or pressing and sintering powdery components of the metal powder to obtain a metal body;
- atomizing the metal body to obtain a metal powder;
- separating out particles of the metal powder having a particle size of <2 μm, determined according to ASTM B822;
- and
- screening so as to classify particle sizes of the metal powder.
3 more elements
37:
- The process as recited in claim 36, wherein the separating out of the particles of the metal powder having the particle size of <2 μm is performed by sifting the metal powder.
38:
- The process as recited in claim 36, wherein the separating out of the particles of the metal powder having the particle size of <2 μm is performed by de-agglomeration of the metal powder in a water bath using ultra sound and a subsequent decantation.
39:
- The process as recited in claim 36, wherein the separating out of the particles of the metal powder having the particle size of <2 μm is performed by stirring the metal powder in a water bath and a subsequent decantation.
40:
- The process as recited in claim 36, wherein the process further comprises:
- a deoxidation step.
41:
- The process as recited in claim 36, wherein the metal powder is further subjected to an acid treatment.
42:
- A method of using the metal powder as recited in claim 26 in an additive manufacturing process, the method comprising:
- providing the metal powder as recited in claim 26;
- and
- using the metal powder in the additive manufacturing process.
1 more element
43:
- A process for producing a three-dimensional article, the process comprising:
- providing the metal powder as recited in claim 26;
- and
- using the metal powder to build up the three-dimensional article layer by layer.
1 more element
44:
- The process as recited in claim 43, wherein the process is selected from the group consisting of a selective laser melting (SLM, LBM), an electron beam melting (EBM), and a laser cladding (CL).
45:
- The three-dimensional article obtained by the process as recited in claim 43.
46:
- The three-dimensional article as recited in claim 45, wherein the three-dimensional article has an elastic modulus mE of 20 to 100 GPa, determined according to DIN EN ISO 6892-1.
47:
- The three-dimensional article as recited in claim 45, wherein the three-dimensional article has an ultimate strength Rm of 600 to 1400 MPa, determined according to DIN EN ISO 6892-1.
48:
- The three-dimensional article as recited in claim 45, wherein the three-dimensional article has a yield strength Rp0.2 of 500 to 1200 MPa, determined according to DIN EN ISO 6892-1.
49:
- The three-dimensional article as recited in claim 45, wherein the three-dimensional article has,
- an elastic modulus mE of 20 to 100 GPa, determined according to DIN EN ISO 6892-1,
- an ultimate strength Rm of 600 to 1400 MPa, determined according to DIN EN ISO 6892-1, and
- a yield strength Rp0.2 of 500 to 1200 MPa, determined according to DIN EN ISO 6892-1.
1 more element
50:
- The three-dimensional article as recited in claim 45, wherein the three-dimensional article is a medicinal article.