EP 0011981 B1 19831214 - METHOD OF MANUFACTURING POWDER COMPACTS
Title (en)
METHOD OF MANUFACTURING POWDER COMPACTS
Publication
Application
Priority
US 96353978 A 19781124
Abstract (en)
[origin: EP0011981A1] A method of making high density powdered metal compacts and also a method for making high density powder metal sintered products is disclosed. With respect to the compacts, iron powder of coarse or fine configuration is mixed or coated with a low-melting metal additive selected from the group consisting of tin, copper-tin, copper-lead, or lead in a percentage by weight of 2-5% of the admixture. The admixture is subjected simultaneously to both heat (at a temperature level such that the low-melting alloy is in a liquid phase) and pressure which is in the range of 10-30 tsi. Upon relief of heat and pressure, the agglomerated or compacted product will possess an increased density in excess of 80% and an improved hardness and strength level. With respect to a sintered product, the powder metal is selected to have a fine particle size (average range of about 4-5 microns) and the powder is dry impact coated by ball milling with a low-melting additive such as tin, copper-tin, copper-lead or lead; the coated particles are warm briquetted and subjected to a sintering operaton whereby the resulting product has a minimum density of 97% or more.
IPC 1-7
IPC 8 full level
B22F 1/00 (2006.01); B22F 1/02 (2006.01); B22F 1/17 (2022.01); B22F 3/02 (2006.01); C22C 33/02 (2006.01)
CPC (source: EP US)
B22F 1/17 (2022.01 - EP US); C22C 33/0207 (2013.01 - EP); C22C 33/0264 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 0011981 A1 19800611; EP 0011981 B1 19831214; CA 1151384 A 19830809; DE 2966491 D1 19840119; JP S5573801 A 19800603; JP S5653601 B2 19811219
DOCDB simple family (application)
EP 79302649 A 19791121; CA 336663 A 19790928; DE 2966491 T 19791121; JP 14637879 A 19791112