Title:
MANUFACTURE OF METALLIC POWDER
Document Type and Number:
Japanese Patent JP3277823
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To effectively prevent agglomeration of powder with the additives segregated on the surface of metallic powder by adding, into a solution of a metallic salt, metals or semimetals that is insoluble at the heating temperature of the metallic salt, in the production of metallic powder by heating droplet of the metallic salt.
SOLUTION: When metallic powder is manufactured by spray-thermal cracking metals or semimetals that is insoluble under the thermal condition for producing metal powder and hardly liable to form a solid solution into the metallic powder, or one or two and more kinds of compounds producing such oxides are added to one or two and more kinds of metallic salt-containing solution. The metallic powder manufactured by this method has an excellent crystallizability, scarce defects in the interior of grains and little or no grains boundaries. The metals or others decomposed and deposited out of the added compounds are driven out onto the surface of particles simultaneously at the time of generation of metallic particles, and stay segregated in high concentration around the particles surface. As for the segregation generating metals, when silver or silver alloy is chosen as the metallic powder, rhodium, osmium and indium are cited.
Inventors:
Eiichi Asada
Yuji Akimoto
Kazuo Nagashima
Minehito Iwasaki
Yuji Akimoto
Kazuo Nagashima
Minehito Iwasaki
Application Number:
JP27292496A
Publication Date:
April 22, 2002
Filing Date:
September 25, 1996
Export Citation:
Assignee:
Shoei Chemical Industry Co., Ltd.
International Classes:
B22F1/16; B22F1/17; B22F9/30; C23D5/02; H01C17/065; H01G4/008; H05K1/09; (IPC1-7): B22F9/30
Domestic Patent References:
| JP8170112A |
Attorney, Agent or Firm:
Yasuo Yokokura