Effect of Graphite Intercalation Compounds Prepared by Molten Salts Method on High-Pressure Synthetic B-Doped Diamond

Abstract

B-doped diamond abrasive is an excellent grinding material owing to its high oxidation resistance, mechanical strength and inertness with ferrous metal. This paper presents a new method for synthesis of B-doped diamond grits using graphite intercalation compounds (GICs) prepared by molten salts method. GICs refer to the compounds that form through intercalating other atoms, ions or molecules into graphite planar layers. H 3 BO 3 -GICs were prepared through the reaction of graphite with molten boric acid in vacuum. The stage structures of GICs were analyzed by the mean of XRD. Annealing treatment was performed to remove the impurities. Diamond was synthesized at high pressure and high temperature conditions using B-doped GICs as carbon sources. The structure and properties of the synthetic diamond were investigated using Fourier transform infrared absorption spectra (FTIR), Raman spectra and scanning electron microscope (SEM). The oxidation temperature and the resistance of the synthetic diamond were measured. The results show that B-doped black diamond grits were synthesized using H 3 BO 3 -GICs with the mixed stages. The stages and boron contents of GICs were controlled through adjusting the ratio of H 3 BO 3 and graphite. The lower stages of GICs, the darker color of the diamond transformed from the GICs. Boron doping in diamond gave rise to high oxidation temperature and low resistance.

Electrochemical characteristics of boron doped polycrystalline diamond electrode sintered by high pressure and high temperature

“…The details were introduced in the references [14]. X-ray fluorescence results confirmed that the boron content in the diamond reached about 3.75 9 10 20 cm -3 .…”

“…Previous work in our research group has presented a method to synthesize BDD crystals under the conditions of high pressure and high temperature using boron-doped graphite intercalation compounds (GICs) as carbon sources [14,15]. We have also investigated the electrochemical behavior of BDD powder electrode in the neutral supporting electrolyte and the solution containing K 3 Fe(CN) 6 / K 4 Fe(CN) 6 redox couple [16].…”

Electrode Characteristics of High Pressure Synthetic High Boron Doped Diamond

“…Synthesis of B-doped Conductive Diamond. B-doped diamond was synthesized using B-doped GICs with the mixed stages of 1~5 as carbon sources which was introduced in reference [6]. The powders of GICs were mixed with metal catalyst powders and assembled in the pyrophyllite high-pressure mould.…”