A Cousin of Tungsten Carbide, Different Hard Phase

Cermet literally means "ceramic" plus "metal," and that's exactly what it is: a powder-metallurgy composite manufactured the same way as cemented tungsten carbide — hard particles pressed and sintered with a metallic binder. The difference is the hard phase. Instead of tungsten carbide, a cermet is built around titanium carbide (TiC) and titanium carbonitride (TiCN) particles, sometimes with a secondary hard phase, bonded together with nickel and/or cobalt. The rounder grain morphology and different chemistry give cermets a distinct wear behavior compared to WC-Co carbide.

Why Cermets Cut So Clean

Cermets are known for excellent wear resistance, especially resistance to the gradual crater and flank wear that degrades surface finish over a long run. That wear resistance lets a cermet edge stay sharp and dimensionally accurate at higher cutting speeds than a general-purpose carbide grade, which is why cermets are a favorite for finishing operations on steel and stainless steel where the goal is a smooth, tight-tolerance surface — in many cases close enough to grinding-quality finish that a separate grinding pass can be skipped.

The Trade-off vs Tungsten Carbide

That wear resistance comes at the cost of shock resistance. Cermets are generally more brittle and less tough than tungsten carbide, so they don't hold up well to heavy roughing, interrupted cuts, or unstable setups where the edge takes repeated impact loading. Cermets are a finishing specialist, not a roughing tool — pick tungsten carbide when the cut is heavy or interrupted, and reach for a cermet when the priority is speed and surface finish on a continuous, lighter cut.