Description: nowadays, superhard materials (synthetic diamond, natural diamond and cubic boron nitride) will be the most important and preferred tool materials, because these materials can efficiently, accurately and smoothly cut and process the hardest metal and alloy structures.

The borides of rhenium and nitride superhard materials have also made new progress. The borides of rhenium that can be synthesized are rhenium diboride and rhenium tetraboride.

Representative types: ReB2 and ReB4