Abstract The powder forming characteristics of spheroidal graphite were studied in this paper. On the domestic SPD6 X 1200 six-face high-temperature high-pressure equipment, flake graphite and spheroidal graphite (both 400 mesh) are used as carbon sources, and iron-based powder catalyst is used as raw material at pressure of 5.5GPa and temperature of about 1400oC. A high quality diamond single crystal was synthesized under the conditions of 300s. The comparison of diamond grown by spheroidal graphite and scaly graphite illustrates the characteristics of spheroidal graphite-iron-based contact media grown diamond. The results show that spheroidal graphite can also be used to synthesize high-quality abrasive-grade diamond single crystals, but the synthesis temperature is about 100oC higher than that of flake graphite. The synthesized diamond particle size is slightly thicker than that of flake graphite. (Diamond and Abrasives Engineering, 2009, Issue 2)
Abstract In this research, high quality diamonds were synthesized in a China—made cubic high-pressure apparatus (CHPA) (SPD-6 1 200) at 5.5 GPa and 1 400oC for 300 s. Natural spectroscopically pure scalelike graphite powder (400 mesh) and spherical graphite (400 mesh) were used separately as carbon source, Fe-based alloy powder (75чm) was used as solvent—catalyst. The results based on the comparison and analysis indicated that high quality diamonds can also be derived from spherical graphite, but the temperature temperature condition of spherical graphite was 1 00oC higher than that from scalelike graphite.Size of synthetic diamond from spherical graphite was coarser Than that from scalelike graphite.
Abstract In this research, high quality diamonds were synthesized in a China—made cubic high-pressure apparatus (CHPA) (SPD-6 1 200) at 5.5 GPa and 1 400oC for 300 s. Natural spectroscopically pure scalelike graphite powder (400 mesh) and spherical graphite (400 mesh) were used separately as carbon source, Fe-based alloy powder (75чm) was used as solvent—catalyst. The results based on the comparison and analysis indicated that high quality diamonds can also be derived from spherical graphite, but the temperature temperature condition of spherical graphite was 1 00oC higher than that from scalelike graphite.Size of synthetic diamond from spherical graphite was coarser Than that from scalelike graphite.
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