Abstract
The microstructure of Mo2C or Mo2C and WC contained cermet was studied using optical microscope and SEM. It was found by SEM that extremely fine carbides which had never been observed by optical microscope, co-existed with the carbides with surrounding structure usually observed by optical microscope. Formation mechanism of the former carbides seemed to be the same as that of the latter carbides. It was demonstrated in nitrogen free cermets that, by means of decreasing the size of usually observed carbides, the structure finer than that of nitrogen contained cermets was easily obtained.
