Chemistry of inorganic compounds – Carbon or compound thereof – Binary compound
Reexamination Certificate
2006-10-03
2006-10-03
Langel, Wayne (Department: 1754)
Chemistry of inorganic compounds
Carbon or compound thereof
Binary compound
C423S059000, C977S775000, C977S776000
Reexamination Certificate
active
07115240
ABSTRACT:
The present invention relates to a method of producing nanophase powder, which can be used as materials for high-strength and wear-resistance cemented carbide. It purports to provide a method of producing WC powder of a 10˜20 nm grade by using vapor phase reaction with a precursor containing tungsten. For achieving said objectives, the method of producing WC-based powder according to the present invention comprises preparing a precursor containing tungsten; producing gas by vaporizing said precursor in a reactor; and carburizing said gas in a non-oxidizing atmosphere. The nanophase WC powder produced as such has high-strength and excellent wear-resistance, which can be suitably used as materials for carbide tools, carbide cement, wear-resistance components, or metal molds.
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patent: 6447742 (2002-09-01), Lackner et al.
patent: 6495115 (2002-12-01), Dunmead et al.
Ha Gook Hyun
Kim Byung Kee
Hochberg D. Peter
Korea Institute of Machinery and Materials
Langel Wayne
Mellino Sean
Raetzsch Alvin T
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