SURFACE COVERED CERMET DRAWING DIE HAVING HARD COVERING LAYER EXCELLENT IN ADHESIVITY

摘要

PURPOSE: To provide a surface covered cermet drawing die excellent in the adhesivity to the surface of the cermet base body of the hard covering layer. CONSTITUTION: A hard covering layer consisting of one single layer or two or more kinds of combined layers out of TiC, TiN, TiCN, TiCO and TiCNO with the Al2 O3 layer at need is formed with the mean thickness of 0.5-20μm on the surface of the cermet base body consisting of WC base cemented carbide, TiC base cermet or (Ti, M)CN base cermet (where M is the metallic element). The first layer in contact with the surface of the cermet base body of the hard covering layer consists of the TiCN layer where the highest peak strength appears on the (4 2 2) face in the X-ray diffraction.