Cemented carbide is a powdery metallurgical material; a composite of tungsten carbide (WC) particles and a binder rich in metallic cobalt (Co). Cemented carbides for metal cutting applications consist of more than 80% of hard phase WC. Additional cubic carbonitrides are other important components, especially in gradient sintered grades. The cemented carbide body is formed, either through powder pressing or injection moulding techniques, into a body, which is then sintered to full density.

 

 

​WC grain size is one of the most important parameters for adjusting the hardness/toughness relationship of a grade; the finer grain size means higher hardness at a given binder phase content.

 

The amount and composition of the Co-rich binder controls the grade’s toughness and resistance to plastic deformation. At equal WC grain size, an increased amount of binder will result in a tougher grade, which is more prone to plastic deformation wear. A binder content that is too low may result in a brittle material.

 

Cubic carbonitrides, also referred to as γ-phase, are generally

added to increase hot hardness and to form gradients.

 

Gradients are used to combine improved plastic deformation resistance

with edge toughness. Cubic carbonitrides concentrated in the cutting edge improve the hot hardness where it is needed.Beyond the cutting edge, a binder rich in tungsten carbide structure inhibits cracks and chip hammering fractures.

 

 

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