Study on growth of coarse grains of diamond with high quality under HPHT

• 来源期刊: 科学通报(英文版)
• 年，卷（期）: 2009,（1）
• 页码范围: 163-167
• 页数: 5页
• 语种: 英文
• DOI: 10.1007/s11434-008-0577-x

摘要

The growth of coarse grains of diamond was observed with graphite as carbon source and Fe80Ni20 alloy powder as catalyst at HPHT in a China-type SPD 6x1670T cubic high-pressure apparatus with highly exact control system. To synthesize coarse grains of diamond crystal with high quality, ad-vanced indirect heat assembly, powder catalyst technology and catalyst with optimal granularity were used. Especially the nucleation of diamond and the growth rate were strictly controlled by the opti-mized synthesis craft. At last, diamond crystals (about 0.85 mm) in the perfect hex-octahedron shape were successfully synthesized at ~5.4 Gpa and ~1360℃ in 60 min. The characteristic of crystal growth with powder catalyst technology under HPHT was discussed. The results and techniques might be useful for production of coarse grains of diamond.