EP 0011981 A1 19800611 - Method of manufacturing powder compacts.
Title (en)
Method of manufacturing powder compacts.
Title (de)
Pulvermetallurgisches Verfahren zur Herstellung von Formkörpern.
Title (fr)
Fabrication de pièces par le procédé de la métallurgie des poudres.
Publication
Application
Priority
US 96353978 A 19781124
Abstract (en)
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 1/17 (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)
Citation (search report)
- US 4050933 A 19770927 - SANDEROW HOWARD I, et al
- US 1986197 A 19350101 - HARSHAW WILLIAM J
- US 1793757 A 19310224 - SMITH WILLIAM H
- US 3520680 A 19700714 - ORLEMANN JUSTUS K
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