US 11,986,974 B2
Additive manufacturing techniques and applications thereof
Paul D. Prichard, Greensburg, PA (US)
Assigned to KENNAMETAL INC., Latrobe, PA (US)
Filed by Kennametal Inc., Latrobe, PA (US)
Filed on Mar. 24, 2020, as Appl. No. 16/828,657.
Claims priority of provisional application 62/823,149, filed on Mar. 25, 2019.
Prior Publication US 2020/0307018 A1, Oct. 1, 2020
Int. Cl. B28B 1/00 (2006.01); B22F 7/02 (2006.01); B22F 10/28 (2021.01); B22F 10/38 (2021.01); B23K 15/00 (2006.01); B33Y 10/00 (2015.01); B33Y 70/00 (2020.01); B22F 10/14 (2021.01); B22F 10/34 (2021.01); B22F 10/64 (2021.01); B22F 10/66 (2021.01)
CPC B28B 1/001 (2013.01) [B22F 7/02 (2013.01); B22F 10/28 (2021.01); B22F 10/38 (2021.01); B23K 15/0086 (2013.01); B33Y 10/00 (2014.12); B33Y 70/00 (2014.12); B22F 10/14 (2021.01); B22F 10/34 (2021.01); B22F 10/64 (2021.01); B22F 10/66 (2021.01)] 22 Claims
OG exemplary drawing
 
1. A method of making a sintered article comprising:
providing a composite article including a porous exterior printed from a powder composition via one or more additive manufacturing techniques employing powder bed fusion with radiation, the porous exterior defining an interior volume;
providing a loose powder component in the interior volume; and
simultaneously sintering the porous exterior and loose powder component to provide the sintered article comprising a sintered interior and sintered exterior, wherein
the porous exterior exhibits a higher density than a bulk density of the loose powder component;
the porous exterior forms less than 50% by volume of the composite article; and
the powder composition does not contain a binder.