Controllable rapid pressure loading technology for large volume press

A pressure loading method, implemented by using a pressure loading mold, and comprising:

• step 1:
• providing the pressure loading mold, wherein the pressure loading mold comprises secondary anvils and a pressure transmission component, wherein a first structure formed by stacking the secondary anvils is internally provided with a first placement cavity;
• a first shape of the first placement cavity fits a second shape of the pressure transmission component;
• and the pressure transmission component is placed in the first placement cavity,
• wherein the secondary anvils are externally provided with primary anvils:
• a second structure formed by stacking the primary anvils is internally provided with a second placement cavity;
• a third shape of the second placement cavity fits a fourth shape of the first structure formed by stacking all the secondary anvils;
• and the secondary anvils are placed in the second placement cavity,
• wherein the primary anvils are externally provided with a housing:
• the housing is internally formed with a third placement cavity;
• a fifth shape of the third placement cavity fits a sixth shape of the second structure formed by stacking all the primary anvils:
• the primary anvils are placed in the third placement cavity;
• and end covers for closing the third placement cavity are respectively arranged at two ends of the housing,
• wherein the pressure transmission component comprises a regular octahedra, plugs, diamond pistons, and a standard, wherein the regular octahedra is provided with a chamber with openings at two ends of the chamber:
• the standard is placed in the chamber:
• the openings at the two ends of the chamber are respectively blocked by the plugs with an electrically conductive function;
• and each of the diamond pistons is arranged between the standard and a corresponding one of the plugs;
• step 2:
• applying a pre-pressure to the pressure loading mold to compress various components of the pressure loading mold, and recording a current initial pressure value A GPa in a sample cavity;
• step 3:
• obtaining a correspondence relationship between an oil pressure and a pressure in the sample cavity in a manner of calibrating a phase transition of a standard by means of an indirect pressure loading method with a static high pressure, obtaining a pressure correction curve by fitting according to a phase transition point of the standard, and pre-charging a pressure in a pressure loading device according to the pressure correction curve, so that the pressure in the pressure loading device is not lower than an external oil pressure corresponding to a pressure in the sample cavity of (A+10) GPa;
• and
• step 4:
• controlling the pressure loading device to release a pressure to the pressure loading mold, wherein a pressure release time is (20+/−3) ms, and a pressure in the sample cavity reaches (A+10) GPa.