CBN Black (cubic boron nitride)
Cubic boron nitride (CBN) is, after the synthetic diamond, the second hardest material and will be synthesized from hexagonal boron nitride under conditions similar to the ones of production of synthetic diamond of graphite. Desirable properties of an abrasive are big hardness, thoughness, abrasion resistance, thermical and chemical stability as well as the ability during use to keep the sharp cutting edges.
Hardness is a crucial property for every abrasive. However, most of the abrasives suffer under high temperatures during application a hardness loss. One of the physical benefits from CBN after conventional abrasives is that the higher hardness during ambient temperature over a high temperature area remains the same.
CBN abrasives allow during grinding,honing and fine finishing of hardened ferrous materials und difficult machinable alloy in comparison to traditional abrasives a higher productivity and considerably longer tool lifes.
CBN is during grinding of tools as well as grindings for mass production firmly established and is used in the automotive industry as well as in the general mechanical engineering and the aerospace industry. Application examples are camshafts, crankshafts, injectors, transmission parts, transmissions, constant velocity joints, steering parts and components of compressors. Among the many benefits of CBN is the approved surface finish and the production of favorable residual compressive stress on the surface.