STICK COMPOSITIE MATERIALS AND PROCESS FOR PREPARATION THEREOF

摘要

A stick of composite materials comprises a hot-pressed super-hard head member containing higher than 50 vol % of a diamond powder and/or a high pressure boron nitride powder, and a supporting member which is bonded at one of its ends with the hot-pressed super-hard head member. The stick of composite materials is characterized in that: the bonding between the head member and the supporting member is formed during the hot press process of the head member; the stick is of an elongated form, preferably of a cylindrical form of which the sectional diameter or equivalent sectional diameter is not larger than 3 mm; the length of the head member is 0.3 to 2.0 mm in the axial direction of the stick; and that the supporting member is more than five times longer in its axial direction than the head member. The stick of composite materials is usable as a blank for the microdrill, micropunch and the head of the dot character printer. The stick of composite materials is prepared by hot-pressing two layers of materials under a high pressure and at a high temperature to obtain a composite material block composed of a super-hard layer and a supporting layer bonded to the super-hard layer and cutting the same in its axial direction by means of electron spark, electron beam, laser beam or ion beam cutting method into at least two elongated pieces each having a diameter not larger than 3 mm.