EP 0565160 B1 19961106 - Process for making sintered iron components having a pore-free zone
Title (en)
Process for making sintered iron components having a pore-free zone
Title (de)
Verfahren zur Herstellung von Sintereisen-Formteilen mit porenfreier Zone
Title (fr)
Procédé pour la production des pièces frittées à base de fer, ayant un zone non-poreuse
Publication
Application
Priority
DE 4211319 A 19920404
Abstract (en)
[origin: US5453242A] A process for producing from iron materials a sintered molded part which is pore-free in individual zones or boundary zones but porous in the other zones. The process is based on a molded part brought to a residual porosity of about 10% by volume by conventional powder pressing and sintering processes. By additional process steps such as zonal introduction of additional materials or local mechanical recompacting, certain zones or local areas are brought to a residual porosity of 5% by volume or less; at the same time, a closed pore structure is produced in these zones. Under these preconditions, in a final HIP or sintering HIP process step the sintered molded part can be brought to 100% material density in the pretreated zones so that they substantially completely free from pores. The major advantages include local improvement in material properties and calibratability of the finished sintered molded part.
IPC 1-7
IPC 8 full level
B22F 3/24 (2006.01); B22F 3/11 (2006.01); B22F 3/12 (2006.01); B22F 3/26 (2006.01); B22F 5/00 (2006.01); C22C 33/02 (2006.01)
CPC (source: EP US)
B22F 3/1109 (2013.01 - EP US); B22F 3/1266 (2013.01 - EP US); B22F 3/15 (2013.01 - EP US); B22F 3/24 (2013.01 - EP US); B22F 3/26 (2013.01 - EP US); B22F 2998/00 (2013.01 - EP US); B22F 2999/00 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH DE ES FR GB IT LI LU NL SE
DOCDB simple family (publication)
US 5453242 A 19950926; AT E144930 T1 19961115; DE 4211319 A1 19931007; DE 4211319 C2 19950608; DE 59304381 D1 19961212; EP 0565160 A1 19931013; EP 0565160 B1 19961106; ES 2094458 T3 19970116; JP H0610009 A 19940118
DOCDB simple family (application)
US 3815393 A 19930326; AT 93200835 T 19930323; DE 4211319 A 19920404; DE 59304381 T 19930323; EP 93200835 A 19930323; ES 93200835 T 19930323; JP 9886293 A 19930331