Title:
【発明の名称】金属炭化物―VIII族金属粉末およびその製造法
Document Type and Number:
Japanese Patent JP2000512688
Kind Code:
A
Abstract:
A transition metal carbide-Group VIII metal powder comprising discrete particles of a transition metal carbide and Group VIII metal wherein: substantially all of the particles have a size of at most 0.4 micrometer; the transition metal carbide is selected from carbides of the group consisting of tungsten, titanium, tantalum, molybdenum, zirconium, hafnium, vanadium, niobium, chromium, mixtures and solid solutions thereof; and the Group VIII metal is selected from the group consisting of iron, cobalt, nickel, mixtures and solid solutions thereof. Said powders are produced by heating an admixture comprising a finishing source of carbon (e.g., acetylene black), a source of a group VIII metal (e.g., Co3O4), and a particulate precursor to a temperature of about 1173 K to about 1773 K for a time sufficient to form a transition metal carbide-Group VIII metal powder, wherein at least about 25% by weight of the carbide precursor is carburized in forming the transition metal carbide of the transition metal carbide-Group VIII metal powder. The particulate precursor generally contains less than 2.5% oxygen by weight and contains compounds which undergo carburization such as a transition metal (e.g., W), lower valence transition metal carbide (W2C) to form the transition metal carbide (e.g., WC)-Group VIII metal powder.
Inventors:
Dunmead, Stephen Dee.
Romanovsky, Michael Jay.
Romanovsky, Michael Jay.
Application Number:
JP50083498A
Publication Date:
September 26, 2000
Filing Date:
June 04, 1997
Export Citation:
Assignee:
OMG Americas, Inc.
International Classes:
C01B31/30; C22C1/05; C22C29/08; C04B35/56; (IPC1-7): B22F1/00; B22F9/00; C04B35/56; C22C29/08
Attorney, Agent or Firm:
Masao Miyake (1 person outside)