Kinetics of the Densification of Polycrystals Sintered by the Hpht Method from Diamond Powder Synthesized in the System Mg–Zn-B-C Coated by Titanium

Keywords

diamond powder, composite, HPHT method, graphitization

Abstract

The dependence of the density of diamond polycrystals sintered at different temperatures by HPHT method from diamond powders synthesized in the Mg–Zn–B–C system on the duration of sintering was investigated. The purpose of this work is to use titanium as a protective coating on the surface of diamond powder particles to create an insulating layer during sintering between the oxygen contained in the pores during sintering and the surface of the diamond powder, to reduce the degree of transformation of diamond into graphite. The density and porosity of the sintered polycrystals were measured by hydrostatic weighing. The optimal temperature and duration of sintering for diamond particles synthesized in the Mg-Zn-B-C system with a titanium coating were determined, they are, respectively, 1500℃ and 20–30 seconds.

References

1. Chernienko O.I., Bochechka O.O., Lutsak E.M., Belyaev A.S., Klepko O.Yu. and Lysovenko S.O. Thermal conductivity and electrical resistance of diamond polycrystals and diamond-copper, diamond-copper-titanium composites // Rock-destroying and metal-working tools – technique and technology of its manufacture and application. – 2018. – № 21. – P. 258-267. (in Ukrainian)