FEM study on a double-beveled anvil and its application to synthetic diamonds

Abstract

Abstract A new double-beveled anvil for the synthesis of high-quality diamonds has been described, which is used in a China-type large-volume, cubic-anvil, high-pressure apparatus (LV-CHPA, SPD-6X2000). Our results indicate that the pressure generation of a double-beveled anvil is more efficient than that of a single-beveled anvil. To gain the same cell pressure (5.5 GPa), the oil pressure of LV-CHPA using double-beveled anvils decreased by about 10%, compared to using single-beveled anvils. Furthermore, a double-beveled anvil can pressurize a cubic cell of 36 mm3 up to about 6.0 GPa, and simultaneously can increase the temperature up to 1360°C for routine operation. This provides considerable advantages to the synthesis of high-quality diamonds under ultra-high-pressure conditions with the same hydraulic rams. Keywords: anvilcubic-anvilhigh-pressure apparatusdiamondfinite element method Acknowledgements The authors thank Runze Yu, Wei Guo, Hongsheng Jia, Jiangang Guo, Jian Liu, and Guofeng Huang for experimental assistance. We thank Xiaolei Li and Taichao Su for helpful discussions on the manuscript. We also thank the reviewer for helpful comments and suggestions. This research was supported by the National Science Foundation of China under Grant No. 50572032, No. 50731006, and No. 50801030. We are also grateful for the support from the Doctor Science Foundation of the Inner Mongolia University for the Nationalities.