All the metals we can see have shapes. They are a body and parts of a car, parts of a pencil case, and a screw. They all have the shapes according to applications. 

 

In giving a shape to a metal, the metal must be cut or shaved. The saw or knife used in such a work is the cemented carbide. Therefore, cemented carbide must be the hardest in metals. In addition, the secret of the hardness is that cemented carbide contains hard substance and tough metals that bond the substance. The hard subsistence is tungsten carbide (WC), carbide of tungsten. Diamond made of carbon is as hard as diamond is, and the composite of tungsten and carbon is the second hardest. Tough metals are cobalt (Co) and nickel (Ni) which are the families of iron. These two metals make a hard and strong alloy in combination with each other. The structure of cemented carbide is shown in Fig. 1 below.

 

 

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