EP 2104583 A1 20090930 - DIRECT PASSIVATION OF METAL POWDER
Title (en)
DIRECT PASSIVATION OF METAL POWDER
Title (de)
DIREKTE PASSIVIERUNG VON METALLPULVER
Title (fr)
PASSIVATION DIRECTE DE POUDRE MÉTALLIQUE
Publication
Application
Priority
US 2006048828 W 20061222
Abstract (en)
[origin: WO2008079115A1] A method of producing passivated Ti or Ti alloy particles with oxygen concentrations of less than about 900 parts per million (ppm), which includes introducing a halide vapor of Ti or the metal constituents of the alloy at sonic velocity or greater into a stream of liquid alkali or liquid alkaline earth metal or mixtures thereof forming a reaction zone in which the halide is reduced by the liquid metal present in sufficient excess of stoichiometric such that Ti or Ti alloy powder from the reduction of the halide by the liquid metal is friable. After filtration and distillation excess liquid metal is removed fom the Ti or Ti alloy powder that is then maintained at elevated temperature for a time sufficient to grow the particles to average diameters calculated from BET surface area measurement greater than about one micron. After cooling the Ti or Ti alloy powder to temperature of about 800C or less, the cooled Ti or Ti alloy powder is contacted with air and/or water to passivate the particles to produce friable metal powder and to remove other reaction products. A system for accomplishing the method is also shown.
IPC 8 full level
B22F 9/28 (2006.01); C22B 34/12 (2006.01)
CPC (source: EP)
B22F 9/28 (2013.01); C22B 34/1272 (2013.01)
Citation (search report)
See references of WO 2008079115A1
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR
DOCDB simple family (publication)
WO 2008079115 A1 20080703; AU 2006352435 A1 20080703; CN 101568398 A 20091028; EP 2104583 A1 20090930
DOCDB simple family (application)
US 2006048828 W 20061222; AU 2006352435 A 20061222; CN 200680056758 A 20061222; EP 06847931 A 20061222