SINTERING POLYCRYSTALLINE BORON NITRIDE IN THE PRESENCE OF AMORPHOUS LIQUID AND GLASS-CRYSTALLINE SILICATE PHASES

摘要

Experimental investigations aimed to determine the effects of phenomena proceeding in an interface during the process of sintering the microcrystalline cBN with two types of binders i.e. fusible amorphous and glass-crystalline silicate materials were carried out.Strength of these materials is mainly bounded up with properties of the cBN-molten silicates interfaces and the final structure of a bonding phase. The chemical composition of the interface corresponding to the characteristic temperature of composite treatment was tested.It was found that a low wetting angle in the cBN-molten silicates system and high work of adhesion had not the explicit connection with a high value of Young's modulus of the abrasive composites.