Tungsten Carbide Button Cobalt Content

As the cobalt content increases, tungsten carbide hardness and wear resistance decrease, bending resistance increase, but the compressive strength is weaker than before. Also coefficient of thermal expansion rises, thermal conductivity falls down; elasticity modulus and rigidity modulus descend. Bearing fatigue point goes up.

When tungsten carbide button cracks, cobalt phase caused plastic deformation. Carbide stays almost the same, its yield strength is quite high, so it has a certain limitation for plastic deformation of cobalt phase. Low cobalt content tungsten carbide fracture toughness is KIC=3+90λ½, high cobalt content tungsten carbide fracture toughness is KIC=57+12λ½. Tungsten carbide fracture toughness ascents along with the increase of cobalt content. The maximum cobalt content is 29 percent. Tungsten carbide bending strength also goes up with cobalt content. But when cobalt content reaches 10 percent or more, bending strength goes down.


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