US 11,667,084 B2
Method for producing an ordered array of interconnected acoustic microchannels
Jacky Novi Mardjono, Moissy-Cramayel (FR); Arnaud Dubourg, Montreal (CA); Edith-Roland Fotsing, Montreal (CA); and Annie Ross, Montreal (CA)
Assigned to SAFRAN AIRCRAFT ENGINES, Paris (FR)
Appl. No. 16/770,335
Filed by SAFRAN AIRCRAFT ENGINES, Paris (FR)
PCT Filed Dec. 6, 2018, PCT No. PCT/FR2018/053135
§ 371(c)(1), (2) Date Jun. 5, 2020,
PCT Pub. No. WO2019/110940, PCT Pub. Date Jun. 13, 2019.
Claims priority of application No. CA 2988222 (CA), filed on Dec. 6, 2017; and application No. 17 61710 (FR), filed on Dec. 6, 2017.
Prior Publication US 2020/0384695 A1, Dec. 10, 2020
Int. Cl. B29C 64/00 (2017.01); B29C 64/40 (2017.01); B33Y 10/00 (2015.01); B33Y 80/00 (2015.01); C08J 9/26 (2006.01); F02C 7/24 (2006.01); G10K 11/162 (2006.01); B33Y 40/00 (2020.01); B29K 91/00 (2006.01); B29K 101/10 (2006.01); B29L 31/00 (2006.01)
CPC B29C 64/40 (2017.08) [B33Y 10/00 (2014.12); B33Y 40/00 (2014.12); B33Y 80/00 (2014.12); C08J 9/26 (2013.01); F02C 7/24 (2013.01); G10K 11/162 (2013.01); B29K 2091/00 (2013.01); B29K 2101/10 (2013.01); B29K 2995/0002 (2013.01); B29L 2031/7504 (2013.01); F05D 2260/96 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A manufacturing method of an acoustic coating in an ordered array of interconnected micro-channels intended to receive, on a reception surface, an incident acoustic wave with a direction normal to the reception surface, the method comprising:
depositing a sacrificial material on a substrate surface to form a three-dimensional scaffold of filaments,
infiltrating at least one part of said three-dimensional scaffold with a thermosetting material,
solidifying said thermosetting material to form a solidified material, and
removing said sacrificial material from said solidified material to form said ordered array of interconnected micro-channels,
wherein, to confer acoustic properties to said ordered array of interconnected micro-channels and form said acoustic coating, said filaments forming by superimposed layers said three-dimensional scaffold are, for a given layer of filaments, oriented in a direction forming, in a plane formed by said layer, a first predetermined angle relative to the direction of said incident acoustic wave, and
wherein a diameter or a cross-section width of the filaments is less than 250 microns.