Patent ID: 7390456
Filing Date: 2008-06-24
Classification: C22C,H01M,Y02E,Y02P

Abstract:
1. A powder-metallurgic method, which comprises: providing a ready-to-press powder with grain fractions having a grain size of about 45 μm to about 160 μm and defining an alloy having a portion of at least 20 weight % elementary chromium powder, a master-alloy powder of iron, and at least one additional alloy portion selected from the group consisting of metallic alloy portions and ceramic alloy portions in an aggregate of no more than 10 weight %; wherein the additional alloy portions are added into the ready-to-press powder exclusively in form of a master-alloy powder, and the master-alloy powder is a pre-alloyed powder consisting of: substantially without intermediate mechanical alloying of the ready-to-press powder, pressing the ready-to-press powder in a matrix press to form a pressed powder compact and sintering the pressed powder compact to near final shape of a highly dense part formed of an alloy containing at least 20 weight % chromium, iron, and the at least one additional alloy portion of not more than 10 weight %.