US 12,138,686 B2
Additively manufactured refractory metal component, additive manufacturing process and powder
Karl-Heinz Leitz, Reutte (AT); Heinrich Kestler, Reutte (AT); Peter Singer, Reutte (AT); Gerhard Leichtfried, Innsbruck (AT); Jakob Braun, Innsbruck (AT); Lukas Kaserer, Innsbruck (AT); and Janko Stajkovic, Innsbruck (AT)
Assigned to Plansee SE, Reutte (AT)
Appl. No. 17/294,843
Filed by PLANSEE SE, Reutte (AT)
PCT Filed Oct. 3, 2019, PCT No. PCT/AT2019/060323
§ 371(c)(1), (2) Date May 18, 2021,
PCT Pub. No. WO2020/102832, PCT Pub. Date May 28, 2020.
Claims priority of application No. A 50190/2018 (AT), filed on Nov. 19, 2018.
Prior Publication US 2022/0017999 A1, Jan. 20, 2022
Int. Cl. C22C 27/04 (2006.01); B22F 10/28 (2021.01); B22F 10/34 (2021.01); B33Y 10/00 (2015.01); B33Y 70/00 (2020.01); B33Y 80/00 (2015.01); B22F 1/065 (2022.01)
CPC B22F 10/28 (2021.01) [B22F 10/34 (2021.01); B33Y 10/00 (2014.12); B33Y 70/00 (2014.12); C22C 27/04 (2013.01); B22F 1/065 (2022.01); B22F 2301/20 (2013.01); B33Y 80/00 (2014.12)] 14 Claims
OG exemplary drawing
 
1. A component, comprising:
a solid structure having the characteristics of having been manufactured with a laser beam or electron beam in an additive manufacturing process from at least one material selected from the group consisting of molybdenum, a molybdenum-based alloy, tungsten, a tungsten-based alloy, and a molybdenum-tungsten-based alloy;
said solid structure containing one or more alloying elements which have a reducing effect, at least in a temperature range ≥1500° C., for the following:
in the case of molybdenum and the molybdenum-based alloy, for MoO2 and/or MoO3;
in the case of tungsten and the tungsten-based alloy, for WO2 and/or WO3; and
in the case of the molybdenum-tungsten-based alloy, for at least one oxide selected from the group consisting of MoO2, MoO3, WO2 and WO3;
wherein at least one of said one or more alloying elements is present both in at least partially unoxidized form and in oxidized form;
said one or more alloying elements which have a reducing effect being selected to reduce the formation of molybdenum or tungsten oxides at the grain boundaries by offering oxygen a more attractive reaction partner;
wherein:
a molybdenum content, a tungsten content, or a total content of molybdenum and tungsten is more than 60 at %;
an oxygen content is at least 0.25 at %;
a content of the at least one alloying element in the component in unoxidized and oxidized form lies in a range from 0.1 and 10 at % and is at least 50% higher than the oxygen content in at %;
the oxidized form of said at least one alloying element is in the form of fine oxide precipitations having an average size of less than 5 μm;
a content of carbon in the component lies in a range from 0.05 at % to 20 at %;
the component has the characteristics of having been manufactured layer-wise in a build direction, with an average grain extent in a plane parallel to the build direction of less than 5.