EP 0233574 A2 19870826 - Method for controlling the oxygen content in agglomerated molybdenum powder.
Title (en)
Method for controlling the oxygen content in agglomerated molybdenum powder.
Title (de)
Verfahren zur Überwachung des Sauerstoffgehaltes in einem agglomerierten Molybdänpulver.
Title (fr)
Procédé de contrÔle du pourcentage d'oxygène compris dans une poudre agglomérée de molybdène.
Publication
Application
Priority
- US 82880186 A 19860212
- US 83120086 A 19860220
- US 83120186 A 19860220
Abstract (en)
A method is disclosed for introducing a controlled level of oxygen into agglomerated molybdenum metal powder, in particular into agglomerated molybdenum plasma spray powder. According to a first aspect of the invention, the method involves contacting the powder with a relatively dilute solution containing a sufficient amount of an oxidizing agent for a sufficient time to increase the oxygen content of the powder followed by removing the resulting partially oxidized powder from the resulting solution. According to a second aspect of the invention, the method involves heating the powder at a sufficient temperature for a sufficient time in the presence of water vapor, and a non-oxidizing atmosphere with the amount of non-oxidizing atmosphere being controlled to produce a partially oxidized molybdenum powder. According to a third aspect of the invention, the method involves forming a relatively uniform mixture of agglomerated powders consisting essentially of molydenum and one or more oxygen containing compounds of molybdenum wherein the mixture has an oxygen content of more than about 10% by weight and reducing the mixture at a sufficient temperature for a sufficient time to remove a portion of the oxygen therefrom and form a molybdenum powder having an oxygen content of no greater than about 10% by weight.
Method comprises forming a relatively uniform mixt. of agglomerated powders of Mo and O2 contg. Mo where O2 content is at least 10% by wt. then reducing the mixt. for a sufficient time and at a temp. of 700-1000 deg.C to remove a portion of the O2 leaving a Mo powder with an O2 content of less than 10%, more space 7-10%.
IPC 1-7
IPC 8 full level
B22F 1/02 (2006.01); C22C 1/10 (2006.01); C23C 4/06 (2006.01); C23C 8/16 (2006.01)
CPC (source: EP US)
C22C 1/10 (2013.01 - EP US); C23C 4/06 (2013.01 - EP); C23C 8/16 (2013.01 - EP)
Designated contracting state (EPC)
CH DE GB LI
DOCDB simple family (publication)
EP 0233574 A2 19870826; EP 0233574 A3 19890726; EP 0233574 B1 19930512; DE 233574 T1 19871217; DE 3785775 D1 19930617; DE 3785775 T2 19930812
DOCDB simple family (application)
EP 87101816 A 19870210; DE 3785775 T 19870210; DE 87101816 T 19870210