Cubic boron nitride (cBN) is a synthetic allotropic form of boron nitride that is obtained under high pressure and high temperature (HPHT) conditions, usually from hexagonal boron nitride (hBN). Cubic boron nitride compacts are produced by sintering cBN with binder into HPHT conditions at range of 6,0-8,0GPa and temperature between 1600-2000°C during up to 30 minutes. In the present work, composites of cBN with titanium-based binders with cBN ratio of 90%w were sintered under HPHT conditions, 7,7GPa and 2000K. SEM analysis observations showed some porous, as sash, the structure was partially sintered. Hardness and wear resistance were carried through demonstrating good results. The mechanical investigations were performed using a turning machine and a AISI 4140 hardened steel cylinder with 54HRC, in real work conditions without cooling.
Cubic boron nitride; HPHT sintering; cBN-Ti composites
