COATED CBN

摘要

The invention relates to a coated boron or nitrogen containing superhard abrasive material selected from cBN, boron suboxide and boron carbide comprising: cBN, boron suboxide and/or boron carbide superhard abrasive material substrate; a primary layer of a carbide/nitride/boride forming metal, such metal preferably being Ti and preferably being substantially in the form of the carbide, nitride or boride; a secondary layer of a high melting point metal selected from W, Mo, Cr, Ni, Ta, Au, Pt, Pd and alloys thereof; and an overcoat of Ag, Ni, Cu, Au, Pd, Pt, Rh, Os, Ir, Re, combinations and alloys thereof such as bronze (Cu/Sn), silver/bronze and sifver/tin, the metal of the secondary layer being different to the metal of the overcoat. The invention further relates to methods for the manufacture of such material, use of such materials in tools and tools including such material.