Superhard Composite Containing Boron Nitride and Silicon Nitride
As a superhard material, next to diamond, the cubic boron nitride (cBN) is of great interest owing to its efficiency in machining ferrous alloys. In nature, only the hexagonal, hBN, exists. In practice, high pressure and high temperature (HPHT) synthesis has to be used to produce small cBN crystals. For larger size machining inserts, the powder-like cBN crystals need to be sintered at specific HPHT conditions using a metallic binder. The present work investigates the sintering of cBN inserts using a Si3N4 binder agent. The results disclosed relatively high hardness for the inserts and revealed their effectiveness in machining high strength steels.
Yuriy Verbovytskyy and António Pereira Gonçalves
A. L. D. Skury et al., "Superhard Composite Containing Boron Nitride and Silicon Nitride", Solid State Phenomena, Vol. 194, pp. 199-203, 2013