Patent ID: 12202222

Reference numerals in the drawings:1regular octahedra;2plug;3diamond piston;4standard;5first protective sleeve;6second protective sleeve;7secondary anvil;8primary anvil;9housing; and10end cover.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Technical solutions in embodiments of the present disclosure will be clearly and completely described herein below with reference to accompanying drawings in the embodiments of the present disclosure. Apparently, the described embodiments are merely part rather than all embodiments of the present disclosure. On the basis of the embodiments of the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative effect fall within the scope of protection of the present disclosure.

To make the above objective, features, and advantages of the present disclosure more apparent and more comprehensible, the disclosed embodiments are further described in detail below with reference to the accompanying drawings and specific implementations.

As shown inFIG.1toFIG.2, the present disclosure discloses a pressure transmission component, a pressure loading mold, and a pressure loading method, which may also be referred to as a controllable rapid pressure loading technology for a large volume press. The pressure transmission component includes a regular octahedra1, plugs2, diamond pistons3, and a standard4. The regular octahedra1is provided with a cavity with openings at two ends of the cavity. The standard4is placed in the cavity. The openings at the two ends of the cavity are blocked by the conductive plugs2. The diamond piston3is arranged between the standard4and the plug2. Compared with an arrangement manner that the standard4is in direct contact with the plugs2, the arrangement manner of the present disclosure that the standard4is in indirect contact with the plugs2improves the compression efficiency of a sample cavity.

The diamond piston3has a first surface that is in contact with the standard4. The standard4has a second surface that is in contact with the diamond piston3. To make the standard4be pressed uniformly, the first surface is set not to be smaller than the second surface in the present disclosure. To avoid sample flowing and improve a binding effect on the standard4, the standard4is externally sleeved with a first protective sleeve5. The first protective sleeve5is able to cover the standard4in a height direction over at least an overall height of the standard. Similarly, the plug2is externally sleeved with a second protective sleeve6. The second protective sleeve6is also able to cover the plug2in a height direction over an overall height of the plug. In a case that a machining process is feasible, the first protective sleeve5and the second protective sleeves6may also be made into an integrated structure. As a preferred embodiment of the present disclosure, the first protective sleeve5and the second protective sleeve6are of split structures, so as to facilitate machining. The first protective sleeve5, the second protective sleeves6, and the regular octahedra1are all made of materials with a compressive strength not greater than 600 MPa. As a preferred embodiment of the present disclosure, the first protective sleeve5, the second protective sleeves6, and the regular octahedra1may be made of magnesium oxide or zirconium oxide. Other materials with the compressive strength not greater than 600 MPa also belong to a scope of protection of the present disclosure, and examples are not given for this one by one. The plugs2are made of a material that is conductive and has a compressive strength of about 1530 MPa. As a preferred embodiment of the present disclosure, the plugs2are made of molybdenum. Other metal materials that can meet the above requirements also belong to the scope of protection of the present disclosure.

As shown inFIG.3toFIG.6, the pressure loading mold provided by the present disclosure includes secondary anvils7and a pressure transmission component. A structure formed by stacking the secondary anvils7is internally provided with a first placement cavity. A shape of the first placement cavity is adapted to a shape of the pressure transmission component. The pressure transmission component is placed in the first placement cavity. The structure formed by stacking the secondary anvils7may be formed by stacking two secondary anvils7at the top and the bottom, and may also be formed by stacking two, six, or eight secondary anvils7. As a preferred embodiment of the present disclosure, the structure formed by stacking the secondary anvils7may be formed by stacking eight secondary anvils7. At least edges, configured for forming the first placement cavity, of the secondary anvils7are chamfered to form the polyhedron-shaped first placement cavity. To improve the pressure transmission effect, all edges of the secondary anvils7are chamfered. As a preferred embodiment of the present disclosure, the pressure transmission component is of a regular octahedron shape.

The secondary anvils7are externally provided with primary anvils8. A structure formed by stacking the primary anvils8is internally provided with a second placement cavity. A shape of the second placement cavity is adapted to a shape of a structure formed by stacking all secondary anvils7. The secondary anvils7are placed in the second placement cavity. The structure formed by stacking the primary anvils8may be formed by stacking two, six, or eight primary anvils8. As a preferred embodiment of the present disclosure, the structure formed by stacking the primary anvils8may be formed by stacking six primary anvils8. As a preferred embodiment of the present disclosure, the structure formed by stacking all secondary anvils7is of a hexahedron shape.

The primary anvils8are externally provided with a housing9. The housing9is internally formed with a third placement cavity. A shape of the third placement cavity is adapted to a shape of the structure formed by stacking all primary anvils8. The primary anvils8are placed in the third placement cavity. End covers10for closing the third placement cavity are respectively arranged at two ends of the housing9. To improve the binding effect of the housing9on the primary anvils8, the housing9of the present disclosure is preferably of an integrated structure. As a preferred embodiment of the present disclosure, the structure formed by stacking all primary anvils8is of a cylindrical shape.

A pressure loading method provided by the present disclosure, implemented by using the pressure loading mold, and includes the following steps 1-3:

In step 1: a pre-pressure is applied to a pressure loading mold to compress various components of the pressure loading mold, and a current initial pressure value A GPa in a sample cavity is recorded.

In step 2: a correspondence relationship between an oil pressure and a pressure in the sample cavity is obtained in a manner of calibrating a phase transition of a standard by means of an indirect pressure loading method with high pressure, a pressure correction curve is obtained by fitting according to a phase transition point of the standard, and a pressure in a pressure loading device is pre-charged 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 the pressure in the sample cavity of (A+10) GPa.

In step 3: the pressure loading device is controlled to release a pressure to the pressure loading mold, where the pressure release time is (20+/−3) ms, and the pressure in the sample cavity reaches (A+10) GPa.

In step 1, the pre-pressure is applied to the pressure loading mold, so that various components in the pressure loading mold are compressed to reduce gaps between the various components, thus preventing positions of the various components from being too scattered, the too scattered positions of the various components affect a pressure transmission speed of transmitting a pressure to the standard4. A value of the pre-pressing force may be selected as required. As a preferred embodiment of the present disclosure, the pre-pressing force is 10.9 Bar and the initial pressure in the sample cavity is 2.5 GPa.

In step 2, a plurality of groups of relationship curves between a pressure of an external large volume press and the electrical resistance value of the standard4are obtained first in a pressure loading method with a static high pressure. An actual pressure in the sample cavity is obtained through a method/formula of (a final voltage—1.2V)*4.8/1600 according to an oil pressure value corresponding to a sudden change of the electrical resistance value of the standard4, so as to obtain a curve which is obtained by fitting and that shows the relationship between the pressure of an external pressure loading mechanism and the pressure in the sample cavity. The large volume press may be a large volume press with a bladder-type energy storage device, or a large volume press with other structures capable of pre-charging a pressure. A pressure loading medium may be pressurized oil, pressurized gas, or the like. As a preferred embodiment of the present disclosure, the pressure loading medium is the pressurized oil. As a preferred embodiment of the present disclosure, after a pressure is pre-charged, the oil pressure reaches 105 Bar and the pressure of the pressure loading device reaches 14.9 GPa.

In step 3, a pressure release speed of the pressure loading device is controlled by a control device. In a case that a pressure in the sample cavity is detected by means of a pressure sensor to directly monitor whether a pressure loading time is reached, when the pressure in the sample cavity approaches (A+10) GPa, the pressure loading time is directly recorded. In a case that a voltage is detected to monitor whether the pressure loading time is reached, a voltage change jump value (the final voltage-1.2 V) can also be recorded in addition to recording the pressure loading time, where 1.2 V is an initial voltage. A pressure jump value can be obtained by using a formula through a change of a voltage value, so an actual pressure jump value, that is, (the final voltage-1.2V)*4.8/1600, in the sample cavity can be obtained according to a corresponding relationship between a voltage and a pressure of the pressure sensor. As a preferred embodiment of the present disclosure, an oscilloscope is used as a testing instrument, and a voltage of a signal is set as a triggering condition of the oscilloscope. Specifically, when the voltage at a time when the pressure in the sample cavity reaches (A+10) GPa satisfies the triggering condition of the oscilloscope, the time when a driving pressure changes is recorded by using single triggering, and the time when the pressure of the oscilloscope is generated is observed. According to a signal processing method, a rise time is the time when a response curve reaches a steady-state value for the first time from zero, and the pressure generation time of 18.59 ms may be obtained by adjusting the rise time by using the oscilloscope. By the change of the voltage of the oscilloscope, it is calculated that the pressure in the sample cavity reaches 12.4 GPa.

It is to be noted that, for those skilled in the art, it is apparent that the present disclosure is not limited to the details of the above exemplary embodiments and can be implemented in other specific forms without departing from the spirit or basic features of the present disclosure. Therefore, from any point of view, the embodiments are to be regarded as exemplary but not restrictive. The scope of the present disclosure is limited by the attached claims rather than the above description. Therefore, it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present disclosure, and any numeral in the claims shall not be regarded as limiting the claims involved.