Effect of precompression on pressure-transmitting efficiency of pyrophyllite gaskets |
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Authors: | Leiming Fang Chao Chen Liye Ding Xiangjie Luo |
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Institution: | Institute of Atomic and Molecular Physics, Sichuan University , Chengdu, 610065, P. R. China |
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Abstract: | Pyrophyllite is widely used both as a gasket material and as a pressure-transmitting medium, especially for a large-volume press. Its pressure-transmitting efficiency mainly depends on the following factors: geometry of anvil and pyrophyllite block, chemical composition, density and strength. For a long time, most studies have been devoted to the first two factors, whereas the third one has been studied less. In this work, we report that the pressure-transmitting efficiency of pyrophyllite is improved by precompressing. The results show that pyrophyllite was fully densified when the pressure reached about 1 GPa. The press load for Ba I–II transition in the cubic large-volume pressure cell is reduced more than 8×105 N by using the densified pyrophyllite, compared with the unprecompressed pyrophyllite. Namely, the press-load utilization efficiency was improved above 15% when the precompressed pyrophyllite is used as a pressure-transmitting medium. |
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Keywords: | Precompression Pressure-transmitting medium Pressure-transmitting efficiency Large-volume press |
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