DiTungsten Pentaboride

DiTungsten Pentaboride (W2B5) is a synthetic compound of tungsten and boron. Its hardness is similar to cBN, while offering a higher resistance to oxidation than synthetic diamond (at high temperatures). It shows good thermal conductivity as well as electrical conductivity.


DiTungsten Pentaboride is e.g. used for making high-speed cutting tools, drilling tools and composite-sheets. The advantage of DiTungsten Pentaboride-coated tools is that they cannot contaminate the steel with carbon.


Another exemplary application is in high‑temperature oxidation‑resistant refractories.


The density is 15.3 g/cm³, the melting point is 2,365 °C.