Zhang Jiawei, He Duanwei, Fang Leiming, Hu Qiwei, Li Xin, Li Qiang, Wang Junpu, Wang Yipeng
Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China.
Key Laboratory of Neutron Physics and Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621999, China.
Rev Sci Instrum. 2020 Dec 1;91(12):125103. doi: 10.1063/5.0018188.
Size matching between anvils and the pressure transmitting medium (PTM) is a key factor that affects pressure generation and sealing for a large volume cubic press. In this work, we studied the influence of PTM sizes from 30.5 mm to 34.5 mm at a fixed anvil geometry dimension (23.5 mm) on the pressure efficiency and sealing performance by measuring the pressure of the gasket and cell simultaneously at room temperature. Wires made of Bi, Tl, Ba, or Manganin were used for pressure calibration experiments within a pressure range of up to 6 GPa. It was found that a PTM with an edge length of 33.5 mm had the highest pressure-generation efficiency, but its sealing performance was the worst. Furthermore, it was confirmed that a PTM with an edge length of 32.5 mm had the best overall performance for a 23.5 mm anvil when both efficiency and sealing were considered. The results show that the pressure-generation efficiency and sealing performance are highly sensitive to PTM size. It is less rigorous to gauge the performance of the assembly only by the pressure-generation efficiency. This work provides practical guidelines and contributes to optimizing the design of the high-pressure assembly.
顶砧与压力传递介质（PTM）之间的尺寸匹配是影响大腔体立方压机压力产生和密封的关键因素。在本工作中，我们在固定顶砧几何尺寸（23.5 mm）的情况下，通过在室温下同时测量垫片和样品腔的压力，研究了边长从30.5 mm到34.5 mm的PTM尺寸对压力效率和密封性能的影响。由铋、铊、钡或锰铜制成的导线用于高达6 GPa压力范围内的压力校准实验。结果发现，边长为33.5 mm的PTM具有最高的压力产生效率，但其密封性能最差。此外，还证实，当同时考虑效率和密封时，对于边长为23.5 mm的顶砧，边长为32.5 mm的PTM具有最佳的综合性能。结果表明，压力产生效率和密封性能对PTM尺寸高度敏感。仅通过压力产生效率来衡量组件的性能不太严谨。本工作提供了实用指南，并有助于优化高压组件的设计。
