EP 3047925 A4 20170607 - SURFACE TREATMENT METHOD FOR POWDERED METAL MATERIAL
Title (en)
SURFACE TREATMENT METHOD FOR POWDERED METAL MATERIAL
Title (de)
OBERFLÄCHENBEHANDLUNGSVERFAHREN FÜR PULVERFÖRMIGES METALLMATERIAL
Title (fr)
PROCÉDÉ DE TRAITEMENT DE SURFACE POUR MATÉRIAU MÉTALLIQUE EN POUDRE
Publication
Application
Priority
- JP 2013193254 A 20130918
- JP 2014074518 W 20140917
Abstract (en)
[origin: EP3047925A1] Provided is a surface treatment method for safely, simply and quickly improving a powdered metal material to be used as a material in powder metallurgy, thermal spraying, or the like. The present invention involves: using a blast-machining device equipped with a dust collection means for spraying a spray powder and compressed air inside a work space and causing the same to collide with a collidable object, and removing and recovering dust by aspirating the interior of the work space; performing a blast treatment for repeatedly causing collisions at a spraying speed of 100-300 m/sec between a powdered metal material having an average particle diameter of 10-200[mu]m, and a medium material having a hardness equal to or greater than that of the powdered metal material; and detaching a surface oxide from the powdered metal material, and forming a fine-grain region which is near the surface of the powdered metal material and has a finer grain size than that of the center section thereof. The sintered metal obtained by sintering the powdered metal material subjected to the surface treatment has a concordant composition in which the fine-grain region and the large-grain region are concordantly arranged, and exhibits a balance of high ductility and high strength.
IPC 8 full level
B22F 1/00 (2022.01); B22F 1/14 (2022.01); B22F 1/142 (2022.01); B22F 7/06 (2006.01); B24C 1/00 (2006.01); B01J 3/08 (2006.01); B02C 19/06 (2006.01); B22F 9/04 (2006.01); C21D 8/02 (2006.01)
CPC (source: EP US)
B22F 1/00 (2013.01 - EP US); B22F 1/14 (2022.01 - EP US); B22F 1/142 (2022.01 - EP US); B02C 19/06 (2013.01 - US); B22F 2009/044 (2013.01 - EP US); B22F 2009/045 (2013.01 - EP US); B22F 2207/13 (2013.01 - EP US); B22F 2301/052 (2013.01 - US); B22F 2301/10 (2013.01 - US); B22F 2301/35 (2013.01 - US); B22F 2998/10 (2013.01 - EP US); B22F 2999/00 (2013.01 - US); B24C 1/00 (2013.01 - US); C21D 8/0205 (2013.01 - US)
Citation (search report)
- [XI] EP 0687739 A1 19951220 - FUJI KIHAN CO LTD [JP]
- See references of WO 2015041236A1
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
DOCDB simple family (publication)
EP 3047925 A1 20160727; EP 3047925 A4 20170607; EP 3047925 B1 20220413; CN 105339112 A 20160217; CN 105339112 B 20170419; HK 1219075 A1 20170324; JP 2015059236 A 20150330; JP 5723942 B2 20150527; US 2016193658 A1 20160707; WO 2015041236 A1 20150326
DOCDB simple family (application)
EP 14845712 A 20140917; CN 201480035621 A 20140917; HK 16107071 A 20160620; JP 2013193254 A 20130918; JP 2014074518 W 20140917; US 201414895321 A 20140914