Non-magnetic or feebly magnetic diamond sintered compact and a process for the productin of the same

Abstract

The object of the present invention is to provide a non-magnetic or feebly magnetic diamond sintered compact available for a magnetic article or magnetic material. This object can be achieved by a non-magnetic or feebly magnetic diamond sintered compact whose magnetic susceptibility is at most 3% of Fe, consisting of a high hardness sintered compact comprising at least 50 volume % of diamond with a grain size of 0.1 to 100 .mu.m and a binder phase containing a metallic component selected from the group consisting of ferromagnetic iron group metals such as Ni, Co, Fe, etc. and mixtures thereof, in which at least one of feebly magnetic metal components each having a magnetic susceptibility of at most 5.times.10.sup.-8 (emu/g), for example, Cr, V, Cu, Si, Zn, Al Mo, W, etc. is dissolved in a proportion of 1 to 50 volume % to the binder phase to form an alloy, whereby the magnetic moment of the diamond sintered compact having the binder phase containing the iron group metals and others, as a predominant component, is decreased by at least 80%.

Dependencies are inferred from the claim text.