Patent ID: 7972409
Filing Date: 2011-07-05
Classification: B22F,C22C

Abstract:
1. A cemented carbide comprising: 5 to 10 mass % of cobalt and/or nickel; 0 to 10 mass % of at least one selected from a carbide except for tungsten carbide, a nitride and a carbonitride of at least one selected from the group consisting of metals of groups 4, 5 and 6 of the Periodic Table; and the balanced amount of tungsten carbide, a hard phase comprising mainly tungsten carbide particles, and containing β particles of at least one selected from the carbide, the nitride and the carbonitride, and the hard phase being bonded through a binder phase comprising mainly cobalt and/or nickel, wherein a mean particle size of the tungsten carbide particles is 1 μm or less, and the cemented carbide having a sea-island structure in which plural binder-phase-aggregated portions comprising mainly cobalt and/or nickel are scattered in the proportion of 10 to 70 area % relative to the total area on the surface of the cemented carbide, and wherein a ratio of the total content m