The fracture toughness of cemented carbide is also known as the coefficient of saturation (Kic), which is used as an index to measure the energy and impact load that must be used for the damage of cemented carbide.
The testing method is to make the sample crack and fracture by external force, and the energy value from crack propagation to fracture is the fracture toughness. Fracture toughness represents flexibility, the larger the value, the more difficult to expand the crack.
The fracture toughness increases with the increase of cobalt content and decreases with the decrease of the particle size of tungsten carbide.
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