CEMENTED CARBIDE, AND MOLD WHICH IS FOR ULTRAHIGH-PRESSURE GENERATING DEVICE AND USES SAME

A cemented carbide including a first phase being composed of a plurality of tungsten carbide grains and a second phase containing cobalt, wherein the cemented carbide contains chromium and vanadium, a mass-based percentage of the chromium to the cobalt is 5% or more and 9% or less, a mass-based percentage of the vanadium to the cobalt is 2% or more and 5% or less, an area ratio of the second phase is 7.5 area% or more and 13.5 area% or less, and a number of the second phases is 1000 or more, wherein the area ratio of the second phase and the number of the second phases are measured in a measurement field of 101 µm2 by performing image processing on a scanning electron microscope image of a cross section of the cemented carbide.