Polycrystalline diamond sintered body tool excellent in interfacial bond strength and its manufacturing method

摘要

In a polycrystalline diamond sintered body tool in which a diamond layer (18) containing a metal catalyst made of Co is provided on a cemented carbide substrate (17), the cemented carbide substrate (17) and the diamond layer (18 The average layer thickness of the Co-rich layer (19) formed at the interface with the metal layer) is 30 μm or less, preferably the average Co content CDIA in the diamond layer (18) and the Co content in the Co-rich layer (19). The ratio CMAX / CDIA ratio of the peak value CMAX of the amount is 2 or less, and more preferably 50 μm from the interface between the cemented carbide substrate (17) and the diamond layer (18) to the inside of the diamond layer (18). The average particle diameter D of the WC particles in the region up to is a polycrystalline die satisfying D / Do <2, where Do is the average particle diameter of the WC particles in the cemented carbide substrate (17). Yamamond sintered tool.