PERCOBAAN PENGERASAN PERMUKAAN KOMPONEN GERUS ATTRITION MILL

Abstract

In order to be able to grind a relatively hard material, the working component of an attrition mill should have a good strength and hardness. To obtain such a component, it can be done by using a special high quality steel or by using an ordinary carbon steel with surface hardening. One of the hardening method is the surface chromizing. There are two methods of surface chromizing, namely the electroplating method and the diffusion (pack cementation or case hardening) method. Both methods can produce better surface hardness compare to its base metals. The product of electroplated hard chrome can improve its surface hardness to 737 to 852 VHN, while the product of diffusion hardening can reach more than 1100 VHN. The adhesion of diffusion surface also better than the product of electroplated hard chrome because of the existence of diffusion layer between the chrome layer and the base metal. On the other hand, the electroplating product give a drastic different layer between the chrome layer and the base metal. From the technical point of view the diffusion method is more recommended for the surface hardening of the attrition mill working components.