"Cermet" is a generic name for a whole range of different composites. Sometimes the ceramic is the biggest ingredient and acts as the matrix (effectively the base or binder) to which particles of the metal are attached. Cermets used for electrical applications are typically made this way (in other words, they are examples of ceramic matrix composites or CMCs). But the metal component (typically an element such as cobalt, molybdenum, or nickel) can also be the matrix, giving what's called a metal matrix composite (MMC), in which hard ceramic particles are held together by a tough but ductile metal. Cermets used in things like cutting tools are made this way.
Tungsten carbide is a chemical compound containing equal parts of tungsten and carbon atoms. In its most basic form, tungsten carbide is a fine gray powder, but it can be pressed and formed into shapes through a process called sintering for use in industrial machinery, cutting tools, abrasives, armor-piercing shells and jewellery.
Cermet is more brittle than tungsten carbide, so cermet cutting tools are susceptible to chipping and breaking when stressed while taking heavy cuts, he said. As a result, more users consider cermet tools suitable for finishing only at a 0.010" to 0.020" DOC.
