Process for producing a component

Patent metadata

Field	Value
Publication number	US-2017189962-A1
Application number	US-201515324877-A
Country	US
Kind code	A1
Filing date	Jun 30, 2015
Priority date	Jul 9, 2014
Publication date	Jul 6, 2017
Grant date	—

Abstract

A method of producing a component from refractory metal or a refractory metal alloy having a refractory metal content >50 at %. The process includes the steps of providing a powder formed of particles and solidifying the powder under the action of a laser beam or electron beam. The powder has a particle size d 50 as measured laser-optically of >10 μm and an average surface area as measured by the BET method of >0.08 m 2 /g.

First claim

1 - 19 . (canceled)

20 . A method of producing a component from refractory metal or a refractory metal alloy having a refractory metal content >50 at %, the method comprising:
providing a powder formed of particles having a particle size d 50 as measured laser-optically of >10 μm and an average surface area as measured by the BET method of >0.08 m 2 /g; and subjecting the powder to a laser beam or electron beam irradiation for solidifying the powder to form the component.

21 . The method according to claim 20 , wherein a surface of the particles at least partly has pores.

22 . The method according to claim 20 , wherein the particles at least partly have a spherical form.

23 . The method according to claim 20 , wherein the powder has a bimodal or multimodal particle size distribution.

24 . The method according to claim 20 , wherein the powder comprises powder particles in agglomerate form and/or aggregate form which are formed of primary particles.

25 . The method according to claim 20 , wherein the powder comprises 0.005 to 5 at % of at least one element selected from the group consisting of Ni, Co, Fe and Pd.

26 . The method according to claim 20 , wherein the powder is at least partly a composite powder.

27 . The method according to claim 20 , wherein the powder is at least partly a coated powder.

28 . The method according to claim 20 , wherein the particles at least partly have a lower melting point in near-surface regions than in near-center regions thereof.

29 . The method according to claim 28 , wherein a melting point difference, in Kelvin, between the melting points of the near-surface regions and the near-center regions is 0.04 to 0.7 times a melting point, in Kelvin, of the near-center regions.

30 . The method according to claim 20 , which comprises producing the powder with a granulating step.

31 . The method according to claim 30 , which comprises following the granulating step with a reducing step at a temperature >500° C.

32 . The method according to claim 20 , which comprises producing the powder with a coating step.

33 . The method according to claim 20 , wherein the powder comprises >80 at % of at least one element selected from the group consisting of Mo and W.

34 . The method according to claim 20 , wherein a BET surface area of the powder particles is >0.1 m 2 /g.

35 . The method according to claim 34 , wherein the BET surface area of the powder particles is >0.13 m2/g.

36 . The method according to claim 20 , which comprises applying the powder in layers.

37 . The method according to claim 20 , which comprises solidifying the powder with an electron beam, providing the powder layer-wise in layers, with the powder at least partly forming sinter necks in a first step through solid-phase sintering, and at least partly melting the powder in a subsequent step.

38 . The method according to claim 37 , which comprises performing the first step with a defocused electron beam.

39 . The method according to claim 20 , wherein the solidifying step comprises solid-phase sintering or liquid-phase sintering under action of a laser beam.

Assignees

• Plansee Se

Inventors

• Kestler Heinrich
• Leichtfried Gerhard
• O'Sullivan Michael
• Tabernig Bernhard

Classifications

• B22F1/065

  Spherical particles · CPC title

• B22F1/05

  Metallic powder characterised by the size or surface area of the particles · CPC title

• B22F1/17

  Metallic particles coated with metal · CPC title

• B22F10/362

  for preheating · CPC title

• B22F10/28

  Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM] · CPC title