Synthesis of Polycrystalline Cubic Boron Nitride from Hexagonal Boron Nitride after Mechanical Activation and Modification with Aluminum

摘要

The effect of the thermochemical modification of hexagonal BN micropowders with aluminum on the synthesis of cubic-BN-based polycrystals after attritor processing is studied. It is found that the preliminary hBN_(attr) modification with aluminum reduces the parameters of the hBN→cBN phase transformation, namely, p and T, and results in the formation of a cBN-based material and refractory aluminum compounds with the finest structure.