EP 0029389 B1 19840314 - PROCESS FOR PRODUCING SHAPED ARTICLES FROM SPHERICAL METAL-PARTICLE POWDERS
Title (en)
PROCESS FOR PRODUCING SHAPED ARTICLES FROM SPHERICAL METAL-PARTICLE POWDERS
Publication
Application
Priority
FR 7928066 A 19791114
Abstract (en)
[origin: US4391772A] The invention is directed to the production of non-fragile shaped members from powders comprising spheroidal metal particles. For this purpose, the invention provides a process for the production of shaped parts from powders comprising spheroidal metal particles which are mixed with from 0.2% to 2% of lubricant, comprising the combination of the following successive steps, performed in the below-indicated order: (a) mixing the powder formed by spheroidal metal particles with an amount of water-soluble cellulose gum between 0.2% and 2%, and with an amount of water which is also between 0.2% and 2%; (b) a cold compacting operation; (c) an optional oven drying operation; (d) a two-phase sintering operation, in an atmosphere which is neutral or reducing with respect to the compacted powder, the first phase being effected at a temperature of from 300 DEG to 500 DEG C. and the second phase being effected at a temperature which is substantially higher and variable with the nature of the powder.
IPC 1-7
IPC 8 full level
B22F 1/00 (2022.01); B22F 3/10 (2006.01); B22F 3/12 (2006.01)
CPC (source: EP US)
B22F 1/00 (2013.01 - EP US); B22F 3/1017 (2013.01 - EP US); B22F 3/12 (2013.01 - EP US)
Citation (examination)
Pulvermetallurgie Sinter- und Verbundwerkstoffe Seite 342-343
Designated contracting state (EPC)
DE GB IT SE
DOCDB simple family (publication)
EP 0029389 A1 19810527; EP 0029389 B1 19840314; DE 3067034 D1 19840419; FR 2469233 A1 19810522; FR 2469233 B1 19820618; US 4391772 A 19830705
DOCDB simple family (application)
EP 80401633 A 19801114; DE 3067034 T 19801114; FR 7928066 A 19791114; US 20282580 A 19801031