Reaserch on pressure generation efficiency of 6—8 type multianvil high pressure apparatus

In the present study, we investigated the major factors and mechanisms of the pressure generation efficiency of the two-stage multianvils high pressure apparatus, which was recently designed and assembled in our laboratory. A simplified mechanical model of the pressure cell assembly was also proposed to interprete the experimental data. The results with the 10/4 (with octahedral edge-length of 10 mm, and WC cube truncation edge-length of 4 mm) cell assembly indicate that the pressure efficiency is very sensitive to the gaskets size and can be improved with the increased initial density of MgO pressure transmitting medium when cell pressure is about 12 GPa. Above 15 GPa, the pressure efficiency is mainly limited by the yield strength of the second stage WC cubes, as well as the composition and size of gaskets.