THE INFLUENCE OF Cr-CLADING ON INTERFACE STRUCTURE AND COMPOSITION OF cBN-BOROSILICATE GLASS COMPOSITE MATERIALS

The interface reaction process,interface composition and structure between Cr clading and cBN at 600-1000℃ were studied by DTA,XRD,SEM and EPMA.The composition,structure and properties of vitrified bond-Cr clad cBN composite material during firing are discussed.Test results show that interface reaction between Cr clading and cBN occurs above 600℃ through reaction diffusion,and the epitaxial CrN and CrB₂ form on the cBN surface above 600℃ and 800℃ separately.The Cr clading and epitaxial compound film cBN on surface of cBN improve the adhesion between the cBN grit and the bond,preventing grit from corrosion during firing.