Chemical Composition of Tungsten Carbide Burrs

Tungsten carbide burrs cutters are made from tungsten carbide which allows them to move at high speeds and yet still sustain their cutting edges. Carbide cutting surfaces are often useful when machining through materials such as carbon and stainless steel as well as in situations where other tools would wear away, such as high-quantity production runs. Usually, carbide will leave a better finish on the tool, and permit quicker machining. Carbide tools can also endure higher temperatures than standard high speed tools. The material is usually tungsten-carbide cobalt, also called “cemented carbide”, a metal matrix composite where tungsten carbide particles are the aggregate and metallic cobalt serves as the matrix.

The process of combining tungsten carbide with cobalt is referred to as sintering or Hot Isostatic Pressing (HIP). During this process cobalt eventually will be entering the liquid stage and WC grains (with higher melting point) remain in the solid stage. Machining with carbide can be difficult, as carbide is more brittle than other tool materials, making it susceptible to chipping and breaking. To offset this, many manufacturers sell carbide inserts and matching insert holders. With this setup, the small tungsten carbide insert is held in place by a larger tool made of a less brittle material (usually steel). This gives the benefit of using carbide without the high cost of making the entire tool out of carbide. Most modern face mills use carbide inserts, as well as some lathe tools and end mills.

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