Cemented carbide and cutting tool using the same

Abstract

The cemented carbide of the present disclosure is a cemented carbide comprising a first phase composed of a tungsten carbide particle and a second phase comprising cobalt as a main component, wherein a total content of the first phase and the second phase in the cemented carbide is 97% by volume or more, an average value of an equivalent circle diameter of the tungsten carbide particle is 0.8 μm or less, a cobalt content of the cemented carbide is 3% by mass or more and 10% by mass or less, a vanadium content of the cemented carbide is 0.01% by mass or more and 0.30% by mass or less, and a maximum value of the vanadium content in an interface region between a (0001) crystal plane of the tungsten carbide particle and the second phase is 15 atomic % or less.

1 . A cemented carbide comprising a first phase composed of a tungsten carbide particle and a second phase comprising cobalt as a main component, wherein
 a total content of the first phase and the second phase in the cemented carbide is 97% by volume or more,   an average value of an equivalent circle diameter of the tungsten carbide particle is 0.8 μm or less,   a cobalt content of the cemented carbide is 3% by mass or more and 10% by mass or less,   a vanadium content of the cemented carbide is 0.01% by mass or more and 0.30% by mass or less, and   a maximum value of the vanadium content in an interface region between a (0001) crystal plane of the tungsten carbide particle and the second phase is 15 atomic % or less.   
     
     
         2 .- 4 . (canceled) 
     
     
         5 . The cemented carbide according to  claim 1 , wherein
 the average value of the equivalent circle diameter of the tungsten carbide particle is 0.2 μm or more.   
     
     
         6 . The cemented carbide according to  claim 1 , wherein
 the maximum value of the vanadium content in the interface region between the (0001) crystal plane of the tungsten carbide particle and the second phase is 1 atomic % or more.   
     
     
         7 . The cemented carbide according to  claim 1 , wherein
 in the second phase, a percentage of cobalt to all of tungsten, chromium, vanadium, and cobalt is 70% by mass or more.   
     
     
         8 . The cemented carbide according to  claim 1 , wherein
 the cobalt content of the cemented carbide is 3% by mass or more and 8% by mass or less.   
     
     
         9 . The cemented carbide according to  claim 1 , wherein
 the vanadium content of the cemented carbide is 0.10% by mass or more and 0.20% by mass or less.   
     
     
         10 . The cemented carbide according to  claim 1 , wherein
 the cemented carbide comprises a third phase consisting of a third phase particle including 10 atomic % or more of vanadium,   a content of the third phase in the cemented carbide is more than 0% by volume and 1% by volume or less, and   a maximum value of an equivalent circle diameter of the third phase particle is 0.5 μm or less.   
     
     
         11 . The cemented carbide according to  claim 1 , wherein a maximum value of a chromium content in the interface region is 20 atomic % or less. 
     
     
         12 . The cemented carbide according to  claim 11 , wherein
 the maximum value of the chromium content in the interface region is 1 atomic % or more.   
     
     
         13 . A cutting tool comprising a cutting edge formed from the cemented carbide according to  claim 1 .