CUTTING TOOL BRAZED WITH VAPOUR PHASE SYNTHETIC DIAMOND THICK FILM

摘要

PURPOSE: To prevent occurrence of break for a long period by brazing vapour phase synthetic diamond thick film of a lamination layer consisting of boron containing layer and noncontaining layer to a cutting tool base. ;CONSTITUTION: A Mo base plate whose surface is subjected to marring process is prepared, this Mo base plate is placed on a base plate holder in the chamber of a direct current arc plasma apparatus, the Mo base plate is held therein and also the first nondope diamond layer of about 70μm thickness is formed by supplying nondope gas for 2.2 hours. Next, boron dope gas in which B₂H₆ gas is added to plasma gas is supplied for three hours and a boron dope diamond layer of about 70μm thickness is formed. The second nondope diamond layer of about 70μm thickness is formed by switching the plasma gas again to the nondope gas, and supplying it for two hours, and lamination diamond thick film of about 210μm total thickness is formed on the Mo base plate. The desired cutting tool is obtained by peeling this lamination diamond thick film from the Mo base plate and next brazing it to a cutting tool base.;COPYRIGHT: (C)1994,JPO