452 / 2019-03-08 16:13:13

Experimental study on the pressure-generation efficiency and pressure-seal mechanism for large volume cubic press

Large volume cubic press; Pressure calibration; Pressure-generation; Pressure-seal; Gasket pressure

全体主题 > High Pressure Physics and Materials Science

Experiments conducted with cubic press could maintain a large sample volume and achieve relatively stable and uniform heating. For these reasons, the large volume cubic press has been a popular device for high-pressure synthesis of super-hard materials in industry and high-pressure research in laboratories. Measuring the pressure of gasket (Pg) and cell (Pc) in situ is the key point to understand the mechanism of pressure-generation and pressure-seal for the widely used large volume cubic press. However, it is a challenge to measure Pg due to the large deformation in the gasket zone and the complex rheological behavior of the pressure transmitting medium (PTM). Although finite-element analysis could simulate the pressure distribution in pyrophyllite gasket and high-pressure cell in a cubic press, it has not yet been experimentally verified and the measuring of Pg is still a challenge.
The poster will introduce an experimental method to measure the pressure of gasket for the widely used large volume cubic press. Based on the results of pressure calibration during the compression and decompression process, the mechanisms on pressure-generation and pressure-seal are discussed. Moreover, a criterion for assessing the performance of the high-pressure assembly was proposed and used to study the optimization design of the size of PTM and the compression process.