Cemented carbide

Abstract

A cemented carbide is a cemented carbide, composed of: hard phases comprising tungsten carbide as a main ingredient and binder phases comprising cobalt as a main ingredient, wherein the hard phases have a ratio D 10 /D 90 of D 10 being an area-based 10% cumulative particle size to D 90 being an area-based 90% cumulative particle size of 0.30 or more, the binder phases have a ratio D 10 /D 90 of D 10 being an area-based 10% cumulative particle size to D 90 being an area-based 90% cumulative particle size of 0.23 or more, wherein the binder phases have an average particle size of 0.25 μm or more and 0.50 μm or less, and wherein the hard phases have an average particle size of 0.30 μm or more and 0.60 μm or less.

1 . A cemented carbide composed of hard phases and binder phases,
 wherein the hard phases comprise tungsten carbide as a main ingredient,   wherein the binder phases comprise cobalt as a main ingredient,   wherein the hard phases have a ratio D 10 /D 90  of D 10  being an area-based 10% cumulative particle size to D 90  being an area-based 90% cumulative particle size of 0.30 or more,   wherein the binder phases have a ratio D 10 /D 90  of D 10  being an area-based 10% cumulative particle size to D 90  being an area-based 90% cumulative particle size of 0.23 or more,   wherein the binder phases have an average particle size of 0.25 μm or more and 0.50 μm or less, and   wherein the hard phases have an average particle size of 0.30 μm or more and 0.60 μm or less.   
     
     
         2 . The cemented carbide according to  claim 1 ,
 wherein the total of chromium content and vanadium content is 0.6% by mass or more and 2.1% by mass or less,   wherein the chromium content is 0.4% by mass or more and 1.5% by mass or less, and   wherein the vanadium content is 0% by mass or more and 0.6% by mass or less.   
     
     
         3 . The cemented carbide according to  claim 1 ,
 wherein, in a rectangular measurement visual field of 42.3 μm×29.6 μm set in an image obtained by subjecting a section of the cemented carbide to elemental mapping with an energy dispersive X-ray analyzer, the total number of first vanadium-containing particles and first chromium-containing particles is two or less,   wherein the first vanadium-containing particles have a particle size of 1 μm or more, and   wherein the first chromium-containing particles have a particle size of 1 μm or more.   
     
     
         4 . The cemented carbide according to  claim 2 ,
 wherein the chromium content is 0.5% by mass or more and 1.4% by mass or less.   
     
     
         5 . The cemented carbide according to  claim 2 ,
 wherein the vanadium content is 0.1% by mass or more and 0.55% by mass or less.   
     
     
         6 . The cemented carbide according to  claim 1 ,
 wherein a content of the hard phases in the cemented carbide is 84% by mass or more and 92% by mass or less.   
     
     
         7 . The cemented carbide according to  claim 1 ,
 wherein the hard phases have the ratio D 10 /D 90  of D 10  being the area-based 10% cumulative particle size to D 90  being the area-based 90% cumulative particle size of 0.50 or less.   
     
     
         8 . The cemented carbide according to  claim 1 ,
 wherein the binder phases have the ratio D 10 /D 90  of D 10  being the area-based 10% cumulative particle size to D 90  being the area-based 90% cumulative particle size of 0.5 or less.   
     
     
         9 . The cemented carbide according to  claim 1 ,
 wherein an average particle size of the binder phases is 0.25 μm or more and 0.45 μm or less.   
     
     
         10 . The cemented carbide according to  claim 1 ,
 wherein an average particle size of the hard phases is 0.35 μm or more and 0.55 μm or less.