EP 0868956 B1 20030903 - Process for preparing metal articles with internal porosity
Title (en)
Process for preparing metal articles with internal porosity
Title (de)
Verfahren zur Herstellung von Metallkörpern mit innerer Porosität
Title (fr)
Procédé de fabrication d'articles métalliques à porosité interne
Publication
Application
Priority
AT 34297 A 19970228
Abstract (en)
[origin: EP0868956A1] Production of metal bodies with homogeneous internal porosity involves (a) homogeneously mixing heavy metal and/or alloy powder, blowing agent powder and optionally non-metallic reactive and/or alloying component and/or a mixing aid; (b) compacting the powder mixture under isostatic pressure optionally in a closed container and/or at elevated temperature; and (c) heat treating the green body at least partially in the region between the solidus and liquidus temperatures of a lower melting heavy metal phase, formed as a result of chemical composition inhomogeneities, and in the region of the reaction and/or decomposition temperature of the blowing agent, to form porosity in the metal body, which is subsequently cooled. Also claimed is a heavy metal or alloy body produced especially by the above process and having ≥ 40 vol.% porosity and a carbon content of 0.05-4.1 wt.% and/or a nitrogen content of 0.002-0.3 wt.%.
IPC 1-7
IPC 8 full level
B22F 3/11 (2006.01)
CPC (source: EP)
B22F 3/1125 (2013.01)
Designated contracting state (EPC)
AT BE CH DE ES FR GB IT LI LU NL SE
DOCDB simple family (publication)
EP 0868956 A1 19981007; EP 0868956 B1 20030903; AT 406557 B 20000626; AT A34297 A 19991115; AT E248675 T1 20030915; DE 59809442 D1 20031009; ES 2202793 T3 20040401
DOCDB simple family (application)
EP 98890051 A 19980226; AT 34297 A 19970228; AT 98890051 T 19980226; DE 59809442 T 19980226; ES 98890051 T 19980226