An anvil pressing device and an assembly method thereof

Abstract

The anvil pressing device and assembly method provided by the embodiments of the present application relate to the technical field of high-pressure optical physics in-situ measurement devices. Among them, the anvil pressing device includes: a cylinder provided with a first light passing hole and a second light passing hole, the extending direction of the first light passing hole is perpendicular to the first end face, and the extending direction of the second light passing hole is inclined with respect to the first end face; a piston provided with a third light passing hole and a fourth light passing hole; a spacer module including two spacers arranged at intervals, and a fixing groove is provided on one side of any one spacer close to the other spacer; two anvils arranged oppositely, each anvil includes a mating part and a supporting part, and each mating part is respectively matched with a fixing groove. In the embodiments of the present application, not only can linear optical measurement be performed, but also oblique incidence optical measurement can be performed, which can meet high-pressure optical experiments with different measurement methods, especially optical experiments that require non-collinear light beams; at the same time, the bearing strength of the anvil can be effectively improved.

Description

Technical Field

[0001] This application relates to the technical field of high-pressure optical physics in-situ measurement devices, and particularly to an anvil press device and an assembly method thereof. Background Art

[0002] In related technologies, the diamond anvil cell (abbreviated as DAC) used in high-pressure optical test experiments measures the properties of a sample under high pressure by means of direct light beam incidence, that is, the incident light, reflected light, scattered light, and transmitted light are collinear. This method will limit some optical experiments that require non-collinear forms, such as oblique incidence Raman spectroscopy, ultrafast optical pump-probe experiments, etc. Although the type of diamond anvil can be improved, such as using a Boehler-type diamond anvil with a large opening angle, the opening angles of these diamonds are also limited, and the upper limit of the pressure loading of the diamond will be greatly reduced. Summary of the Invention

[0003] This application aims to solve at least one of the technical problems existing in the prior art. For this purpose, this application provides an anvil press device, which can not only perform direct incidence optical measurement, but also perform oblique incidence optical measurement, and is also conducive to ensuring the bearing strength to meet the common high-pressure optical measurement requirements.

[0004] An embodiment of one aspect of this application provides an anvil press device, including:

[0005] A cylinder, on the first end face of which there are a first light passing hole and a second light passing hole. The extending direction of the first light passing hole is perpendicular to the first end face, and the extending direction of the second light passing hole is inclined with respect to the first end face.

[0006] A piston, which is matched with the cylinder. The piston is provided with a third light passing hole and a fourth light passing hole. The third light passing hole is on the extension line of the extending direction of the first light passing hole, and the fourth light passing hole is on the extension line of the extending direction of the second light passing hole. A receiving cavity is defined between the piston and the cylinder.

[0007] A spacer block module, including two spacer blocks arranged at intervals. On one side of any one of the spacer blocks close to the other spacer block, there is a fixing groove, which includes a first plane and a second plane. The first plane is parallel to the first end face, and the second plane is perpendicular to the extending direction of the second light passing hole.

[0008] Two anvil blocks arranged oppositely. Each anvil block includes a mating part and a supporting part. Each mating part is respectively matched with one of the fixing grooves, and the two supporting parts are arranged oppositely. The end face of the supporting part is parallel to the first end face.

[0009] Wherein, the extending directions of the first light-passing hole and the second light-passing hole intersect on the end face of the supporting portion close to the first light-passing hole.

[0010] Further, the center of the end face of the supporting portion is located on the extension line of the extending direction of the second light-passing hole.

[0011] Further, the cushion block close to the first light-passing hole is provided with a first avoidance hole and a second avoidance hole. The fitting portion includes a fitting plane and a fitting inclined plane. The size of the first avoidance hole is smaller than that of the fitting plane, and the size of the second avoidance hole is smaller than that of the fitting inclined plane; and / or, the cushion block close to the third light-passing hole is provided with a third avoidance hole and a fourth avoidance hole. The third avoidance hole is located on the connection line between the first light-passing hole and the third light-passing hole, and the fourth avoidance hole is located on the connection line between the second light-passing hole and the fourth light-passing hole.

[0012] Further, the first plane and the second plane are mirror-polished surfaces.

[0013] Further, the anvil is provided with a chamfer at the junction corresponding to the first plane and the second plane.

[0014] Further, the cylinder is provided with a first fitting cavity. The piston includes an end portion and a guiding portion. The guiding portion is connected to the end portion, and the guiding portion is fitted with the first fitting cavity.

[0015] Further, both the cylinder and the piston are provided with pressurizing threaded holes.

[0016] Further, there are two second light-passing holes. The two second light-passing holes are respectively located on both sides of the first light-passing hole, and the axis of each second light-passing hole intersects with the axis of the first light-passing hole on the end face of the supporting portion.

[0017] Further, an observation hole is provided on the circumferential side of the cylinder.

[0018] An embodiment of another aspect of the present application provides an assembling method for an anvil pressing device, which is applied to the anvil pressing device as described above, and includes the following steps:

[0019] Fix the fitting portion of one anvil in the fixing groove of one cushion block by bonding, and fix the fitting portion of the other anvil in the fixing groove of the other cushion block by bonding;

[0020] Fix the two cushion blocks on the piston and the cylinder respectively;

[0021] Make the piston cooperate with the cylinder.

[0022] As can be seen from the above technical solutions, the embodiments of the present application at least have the following beneficial effects:

[0023] In the anvil pressing device provided by the embodiment of the present application, a first light passing hole and a second light passing hole are simultaneously provided, so that the anvil pressing device can not only perform linear optical measurement, but also perform oblique incidence optical measurement, which can meet high-pressure optical experiments with different measurement methods, especially optical experiments that require non-collinear light beams. At the same time, the spacer block is connected to the mating part of the anvil through the fixing groove, increasing the contact area between the anvil and the spacer block, and can effectively improve the bearing strength of the anvil. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 is a schematic structural diagram of an anvil pressing device provided by an embodiment of the present application;

[0026] Figure 2 is Figure 1 the sectional structural diagram of A-A in

[0027] Figure 3 is a schematic structural diagram of a cylinder in an anvil pressing device provided by an embodiment of the present application;

[0028] Figure 4 is a schematic structural diagram of the cylinder in the anvil pressing device provided by an embodiment of the present application from another perspective;

[0029] Figure 5 is a schematic structural diagram of a piston in an anvil pressing device provided by an embodiment of the present application;

[0030] Figure 6 is a schematic structural diagram of the piston in the anvil pressing device provided by an embodiment of the present application from another perspective;

[0031] Figure 7 is a schematic structural diagram of a spacer block in an anvil pressing device provided by an embodiment of the present application;

[0032] Figure 8 is a schematic structural diagram of the spacer block in the anvil pressing device provided by an embodiment of the present application from another perspective;

[0033] Figure 9Schematic cross-sectional structure diagram of a spacer block in an anvil pressing device provided in an embodiment of the present application;

[0034] Figure 10 Schematic structure diagram of a pressure anvil in an anvil pressing device provided in an embodiment of the present application;

[0035] Figure 11 Schematic diagrams of two optical detections when a light beam is directly incident and obliquely incident in an embodiment of the present application. In the diagrams, the arrow direction is the light beam direction;

[0036] Figure 12 Fluorescence peaks of a ruby ball under different pressures in an embodiment of the present application. Among them, the pressure in the left figure is 0 GPa, the pressure in the right figure is 13.2 GPa, and the diameter of the anvil table used is 800 microns.

[0037] Reference numerals:

[0038] 100, cylinder; 110, first fitting cavity; 120, observation hole; 130, first end face; 140, first light passing hole; 150, second light passing hole; 160, pressure application threaded hole;

[0039] 200, piston; 210, end part; 220, guiding part; 230, third light passing hole; 240, fourth light passing hole;

[0040] 300, spacer block; 310, fixing groove; 311, first plane; 312, second plane; 320, first avoidance hole; 330, second avoidance hole; 340, third avoidance hole; 350, fourth avoidance hole;

[0041] 400, pressure anvil; 410, fitting part; 411, fitting plane; 412, fitting inclined plane; 420, supporting part; 421, supporting end face. Detailed implementation manners

[0042] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0043] Under ultra-high pressure, the distance between atoms in a substance will be compressed, the interaction between electron layers will change, and thus crystal and electronic structure transformations will occur. Therefore, studying the crystal and electronic structure behaviors of substances under high pressure is of great significance for understanding some basic physical processes, discovering novel physical phenomena, etc.

[0044] The diamond anvil cell (referred to as DAC) is an important experimental tool for studying the properties of materials under extremely high pressures and is widely used in research fields such as planetary and earth sciences, condensed matter physics, chemistry, and materials science. Conventional DAC mainly consists of three parts: diamond anvils, gaskets, and support and guiding devices. In a commonly used conventional S-type DAC in experiments, by using an auxiliary means such as a pressure wrench or pneumatic film pressurization to squeeze the piston and cylinder parts, and then squeeze the diamond anvils bonded to the pads, pressure is generated on the sample chamber, thereby creating a hydrostatic pressure environment around the sample. In this type of DAC, the diamond anvils are designed to be placed in parallel, and the DAC itself has tapered holes at the front and back to facilitate optical experimental detection.

[0045] The conventional high-pressure optical detection mode is the direct incidence detection mode. Among them, the incident light is perpendicular to the DAC and enters the sample surface through the lower surface of the diamond, and spectral information such as reflected light, scattered light, and transmitted light is collected in the backscattering direction and the transmission direction respectively. Common Raman spectroscopy, scattering spectroscopy, infrared absorption spectroscopy, ultrafast spectroscopy, etc. all adopt this type of measurement method. Due to its simple and convenient configuration, it is widely used in various fields.

[0046] However, all the DACs used in existing high-pressure optical test experiments measure the properties of samples under high pressure by means of direct incidence of light beams, that is, the incident light is collinear with the reflected light, scattered light, and transmitted light. This method will limit some optical experiments that require non-collinear forms, such as oblique incidence Raman spectroscopy, ultrafast pump-probe experiments, etc. Although the type of diamond anvils can be improved, such as using Boehler-type diamond anvils with large opening angles, the opening angles of these diamonds are also limited, and it will greatly reduce the upper limit of the pressure loading of the diamonds.

[0047] In view of this, the embodiments of the first aspect of the present application disclose an anvil pressurizing device to effectively solve the foregoing problems.

[0048] See Figures 1 to 10 As shown, the embodiments of the first aspect of the present application disclose an anvil pressurizing device, including a cylinder 100, a piston 200, a pad module, and an anvil 400.

[0049] Specifically, a first light passing hole 140 and a second light passing hole 150 are provided on a first end face 130 of a cylinder 100. The extending direction of the first light passing hole 140 is perpendicular to the first end face 130, and the extending direction of the second light passing hole 150 is inclined with respect to the first end face 130; a piston 200 is fitted with the cylinder 100. The piston 200 is provided with a third light passing hole 230 and a fourth light passing hole 240. The third light passing hole 230 is located on an extension line of the extending direction of the first light passing hole 140, and the fourth light passing hole 240 is located on an extension line of the extending direction of the second light passing hole 150. A receiving cavity is defined between the piston 200 and the cylinder 100; the spacer block module includes two spacer blocks 300 arranged at intervals. On one side of any spacer block 300 close to the other spacer block 300, a fixing groove 310 is provided. The fixing groove 310 includes a first plane 311 and a second plane 312. The first plane 311 is parallel to the first end face 130, and the second plane 312 is perpendicular to the extending direction of the second light passing hole 150; there are two anvil blocks 400 which are arranged oppositely. Each anvil block 400 includes a fitting portion 410 and a supporting portion 420. Each fitting portion 410 is respectively matched with a fixing groove 310. The two supporting portions 420 are arranged oppositely. The end face of the supporting portion 420, i.e., the supporting end face 421, is parallel to the first end face 130.

[0050] Wherein, the extending directions of the first light passing hole 140 and the second light passing hole 150 intersect at the supporting end face 421 of the supporting portion 420 close to the first light passing hole 140.

[0051] In the anvil block pressurizing device provided by the embodiment of the present application, by simultaneously providing the first light passing hole 140 and the second light passing hole 150, the anvil block pressurizing device can not only perform linear optical measurement, but also perform oblique incidence optical measurement, which can meet the high-pressure optical experiments of different measurement methods, especially the optical experiments requiring non-collinear light beams. At the same time, the spacer block 300 is cooperatively connected with the fitting portion 410 of the anvil block 400 through the fixing groove 310, increasing the contact area between the anvil block 400 and the spacer block 300, and effectively improving the bearing strength of the anvil block 400.

[0052] In some embodiments of the present application, the exact center of the end face of the supporting portion 420 is located on the extension line of the extending direction of the second light passing hole 150. Specifically, the end face of the supporting portion 420 is the supporting end face 421, and the supporting end face 421 is used for abutting against a sample.

[0053] Further, the exact center of the supporting end face 421 is also located on the extension line of the extending direction of the first light passing hole 140. In this way, no matter the incident light is incident from the first light passing hole 140 or the second light passing hole 150, the incident light can pass through the exact center of the supporting end face 421 and then irradiate on the sample.

[0054] In this embodiment, the contour of the supporting end face 421 is circular, and the exact center of the supporting end face 421 is located at the center of the circle.

[0055] It should be understood that in the embodiments of the present application, both of the two cushion blocks 300 are provided with avoidance holes for light to pass through.

[0056] Specifically, referring to Figure 1 and Figure 2 、 Figure 9 and Figure 10 and

[0057] On the cushion block 300 that is relatively closer to the first light passing hole 140 among the two cushion blocks 300, a first avoidance hole 320 and a second avoidance hole 330 are provided. The engaging portion 410 includes an engaging plane 411 and an engaging inclined plane 412. The size of the first avoidance hole 320 is smaller than the size of the engaging plane 411, and the size of the second avoidance hole 330 is smaller than the size of the engaging inclined plane 412. Among them, the extending direction of the first avoidance hole 320 is the same as the extending direction of the first light passing hole 140, so that the light beam entering from the first light passing hole 140 can pass through the first avoidance hole 320 and irradiate the sample; similarly, the extending direction of the second avoidance hole 330 is the same as the extending direction of the second light passing hole 150.

[0058] It should be understood that the fact that the size of the first avoidance hole 320 is smaller than the size of the engaging plane 411 means that the size of the first avoidance hole 320 at the contact with the anvil 400 is smaller than the size of the engaging plane 411. In this way, catalyst leakage can be prevented when the anvil 400 adheres to the cushion block 300; similarly, the fact that the size of the second avoidance hole 330 is smaller than the size of the engaging inclined plane 412 means that the size of the second avoidance hole 330 at the contact with the anvil 400 is smaller than the size of the engaging inclined plane 412. Thus, catalyst leakage can be prevented when the anvil 400 adheres.

[0059] Furthermore, the cushion block 300 close to the three-way light hole is provided with a third avoidance hole 340 and a fourth avoidance hole 350. The third avoidance hole 340 is located on the connection line between the first light passing hole 140 and the third light passing hole 230, and the fourth avoidance hole 350 is located on the connection line between the second light passing hole 150 and the fourth light passing hole 240.

[0060] Among them, the extending direction of the third avoidance hole 340 is the same as the extending direction of the first light passing hole 140, so that the light entering from the first light passing hole 140 can pass through the third avoidance hole 340 and irradiate the sample; similarly, the extending direction of the fourth avoidance hole 350 is the same as the extending direction of the second light passing hole 150. Figures 1 to 3 、 Figure 5 and Figure 6, the cylinder 100 is provided with a first mating cavity 110. The piston 200 includes an end portion 210 and a guiding portion 220. The guiding portion 220 is connected to the end portion 210, and the guiding portion 220 mates with the first mating cavity 110. By the mating of the guiding portion 220 and the first mating cavity 110, it can be ensured that the moving trajectories of the piston 200 and the cylinder 100 during pressurization are on a preset trajectory. Thus, the high-pressure optical measurement effect can be ensured.

[0061] In some embodiments of the present application, referring to Figure 7 and Figure 9 , the first plane 311 and the second plane 312 are mirror-polished surfaces. Among them, the mirror-polished surfaces are obtained by mirror-polishing the first plane 311 and the second plane 312. By mirror-polishing the first plane 311 and the second plane 312, it can be ensured the dimensions and surface flatness of the first plane 311 and the second plane 312, which is beneficial to improving the stress intensity with the anvil 400, thereby ensuring the pressure-bearing strength.

[0062] Furthermore, the anvil 400 is provided with a chamfer at the junction corresponding to the first plane 311 and the second plane 312. Specifically, the mating portion 410 of the anvil 400 abuts and mates with the first plane 311 and the second plane 312 of the fixing groove 310. The mating portion 410 includes a mating plane 411 and a mating inclined plane 412, and a chamfer is provided between the mating plane 411 and the mating inclined plane 412. By machining a chamfer on the surface where the anvil 400 mates with the fixing groove 310, it can be avoided that there is a sharp transition surface on the surface where the anvil 400 contacts the spacer 300, thereby being beneficial to improving the pressure-bearing strength of the anvil 400.

[0063] In some embodiments of the present application, referring to Figure 1 and Figure 2 , there are two second light-passing holes 150. The two second light-passing holes 150 are respectively located on both sides of the first light-passing hole 140, and the axis of each second light-passing hole 150 intersects with the axis of the first light-passing hole 140 on the end face of the support portion 420, that is, the support end face 421. It should be noted that the axes of the first light-passing hole 140 and the two second light-passing holes 150 intersect on the support end face 421 of the anvil 400 close to the first light-passing hole 140.

[0064] In some embodiments of the present application, referring to Figure 3 and Figure 5 , both the cylinder 100 and the piston 200 are provided with pressurization threaded holes 160. After the pressurization threaded holes 160 of the cylinder 100 and the piston 200 are aligned, by passing a fastening bolt through the pressurization threaded holes 160 of both, the cylinder 100 and the piston 200 can move towards each other, thereby changing the pressure on the sample.

[0065] In this embodiment, the cylinder 100 is provided with a plurality of pressurizing threaded holes 160, and the plurality of pressurizing threaded holes 160 are arranged in a circular array with the axis of the first light passing hole 140 as the center. Among them, the end 210 of the piston 200 is provided with a plurality of pressurizing threaded holes 160, and their positions correspond to the pressurizing threaded holes 160 in the cylinder 100. In this embodiment, the pressurizing threaded holes 160 are evenly spaced in the circumferential direction. Thus, the sample can be uniformly stressed in the circumferential direction.

[0066] In some embodiments of the present application, referring to Figure 1 and Figure 2 , an observation hole 120 is provided on the circumferential side of the cylinder 100, which can be used to observe the incident light or the outgoing light.

[0067] In one embodiment of the present application, the anvil 400 is a diamond anvil, and the diamond anvil is specifically a Type IIac diamond anvil with an 800-micron tabletop. Of course, in some other embodiments, anvils 400 with different tabletops and types can also be selected according to the specific pressure range required for the experiment. The materials of the anvil 400 include but are not limited to diamond, silicon carbide, alumina, zirconia, etc.

[0068] In one embodiment of the present application, referring to Figure 2 , the first light passing hole 140, the second light passing hole 150, the third light passing hole 230 and the fourth light passing hole 240 are tapered holes.

[0069] In some embodiments of the present application, the materials of the piston 200, the cylinder 100 and the spacer 300 in the opposed anvil pressurizing device are 40Cr stainless steel after heat treatment. Of course, in other embodiments, other materials such as beryllium copper and non-magnetic steel can also be used according to specific experimental requirements.

[0070] In one embodiment of the present application, the opposed anvil pressurizing device is mainly used in the field of high-pressure spectroscopy. It should be understood that, in certain circumstances, the opposed anvil pressurizing device of the embodiments of the present application can also be used in other high-pressure fields, such as high-pressure electromagnetic transport and high-pressure X-ray diffraction.

[0071] An embodiment of the second aspect of the present application discloses an assembly method of an opposed anvil pressurizing device, which is applied to the opposed anvil pressurizing device as described above, and includes the following steps:

[0072] Fix the mating portion 410 of one anvil 400 in the fixing groove 310 of one of the spacers 300 by bonding, and fix the mating portion 410 of the other anvil 400 in the fixing groove 310 of the other spacer 300 by bonding;

[0073] Fix the two spacers 300 on the piston 200 and the cylinder 100 respectively;

[0074] Fit the piston 200 with the cylinder 100.

[0075] The anvil pressurizing device and the assembly method of the embodiments of the present application will be described in detail below with specific embodiments. It should be noted that the following embodiments are only exemplary descriptions and should not be construed as limitations on the embodiments of the present application.

[0076] See Figures 1 to 10 As shown, the anvil pressurizing device of this embodiment includes a cylinder 100, a piston 200, a spacer block module, and an anvil 400. In this embodiment, the anvil 400 is a diamond anvil 400.

[0077] (1) Design the cylinder 100 and the piston 200, as Figures 3 to 6 shown. First, determine the dimensions of the piston 200, the cylinder 100, the spacer block 300, and the anvil 400. In this embodiment, a common conventional S-type DAC is used. Of course, in other embodiments, other styles of DACs can also be used. The height of the DAC piston 200 module is 23 mm, the bottom diameter is 47.7 mm, the height of the piston 200 part is 15.2 mm, the outer diameter is 18.8 mm, and the inner diameter is 14.8 mm; the height of the cylinder 100 module is 26.3 mm, the bottom diameter is 47.7 mm, the diameter of the cylinder 100 part is 18.82 mm, and the height is 15.2 mm. Then, on the basis of retaining the compressive strength of the press and the original light passing hole, add an oblique incident conical light passing hole, that is, the second light passing hole 150. The angle at which the second light passing hole 150 intersects the first end face 130 is 40 degrees. In other embodiments, it can also be designed into a specific angle according to specific experimental needs, but it should be noted that it cannot intersect with the first light passing hole 140. When designing, the heights of the spacer block 300 and the anvil 400 should be set at the same time to ensure that the convergence vertices of the first light passing hole 140 and the second light passing hole 150 are at the center of the support end face 421 of the anvil 400 close to the first through hole. The draft angle is 14.5 degrees. The draft reference plane is about 23 mm away from the center of the upper surface of the anvil 400, and the draft circle diameter is 12 mm. The second light passing hole 150 needs to avoid the pressurizing threaded hole 160. Among them, both the first light passing hole 140 and the second light passing hole 150 are conical holes. In the actual design process, the angle and size of the conical hole can be changed, but attention should be paid to the pressure-bearing capacity of the piston 200 and the cylinder 100 to prevent the device from cracking under high pressure.

[0078] (2) Design the spacer block 300, as Figures 7 to 9As shown in the figure. The height of the spacer 300 is 5.6 mm, and the bottom and top diameters are 13 mm and 11.22 mm respectively. The original light-transmitting hole, i.e., the first avoidance hole 320 (or the third avoidance hole 340), is retained, and an inclined-incidence conical light-transmitting hole consistent with the above angle, i.e., the second avoidance hole 330 (or the fourth avoidance hole 350), is added to ensure that the obliquely incident light beam passes through and does not affect the vertically incident light beam. The bottom diameter of the second avoidance hole 330 should be greater than or equal to the top diameter of the press conical light-transmitting hole to ensure no light blocking. The diameter at the connection of the first avoidance hole 320 and the second avoidance hole 330 with the fixing groove 310 is about 1.2 mm, which is larger than the spot diameter in most optical experiments. A U-shaped fixing groove 310 is machined on the top of the spacer 300 for bonding the specially designed diamond anvil 400. The fixing groove 310 includes a first plane 311 and second planes 312 inclined on both sides of the first plane 311. The first plane 311 is the bottom surface of the groove, and the second planes 312 are the side surfaces of the groove. The first plane 311 is perpendicular to the first light-transmitting hole 140, and the second plane 312 is perpendicular to the second light-transmitting hole 150. The depth of the fixing groove 310 needs to be designed separately considering the diamond anvil 400 used. The design basis is to ensure that the convergence vertex of the second light-transmitting hole 150 is at the center of the upper surface of the diamond anvil 400. In this embodiment, the depth of the fixing groove 310 is 1.1 mm, the bottom width is 1.14 mm, and the top width is 3.76 mm. Among them, the surface of the fixing groove 310 is polished to a mirror finish to ensure the size and surface flatness, which is beneficial to improving the stress strength between the spacer 300 and the diamond anvil 400.

[0079] (3) Process the ordinary diamond anvil 400, such as Figure 10As shown in the figure. The anvil 400 has a support portion 420, and the diameter of the support end face 421 of the support portion 420 is 800 microns. Of course, in some other embodiments, diamond anvils 400 of other sizes can also be selected. Two planes perpendicular to the above-mentioned second light-transmitting hole 150, namely the mating inclined planes 412, are cut at the bottom of the anvil 400 to ensure that the light beam can be incident on the sample perpendicularly to the diamond. A part of the plane is reserved at the bottom of the anvil 400, namely the mating plane 411, to ensure that the perpendicularly incident light beam can be perpendicular to the mating plane 411 and incident on the sample surface. The sizes of the mating inclined planes 412 and the mating plane 411 should be larger than the sizes of the avoidance holes on the spacer 300 to prevent the catalyst from leaking when the diamond anvil 400 is bonded. It should be noted that the processed mating plane 411 and mating inclined planes 412 should be strictly consistent with the sizes of the above-mentioned fixing grooves 310 to ensure uniform stress. Since errors will inevitably occur in the edges between the surfaces during the processing of the fixing grooves 310 on the spacer 300, a chamfer with a size of 30 microns needs to be processed between the mating plane 411 and the mating inclined planes 412 on the anvil 400. In this way, a sharp transition surface can appear on the lower surface of the diamond anvil 400, which is beneficial to improving the pressure-bearing strength of the diamond.

[0080] (4) Steps need to be processed on some areas of components such as the cylinder 100 and the piston 200 to prevent blocking the second light-transmitting hole 150.

[0081] (5) Assemble the DAC according to the assembly process of the DAC. Bond the diamond to the spacer 300, and the binder is epoxy resin. Then fix the spacer 300 to the piston 200 and cylinder 100 modules with set screws. The bonding and fixing processes need to be carried out under a microscope. Not only should the upper surfaces (i.e., the support end faces 421) of the two diamond anvils 400 be made as parallel as possible, but also it is necessary to ensure that the support end faces 421 of the diamond anvils 400 can be seen through each light-transmitting hole.

[0082] (6) Steps such as drilling holes, loading samples, applying pressure, and testing are the same as those of a conventional DAC. It should be noted that since the convergence vertex of the obliquely incident second light-transmitting hole 150 is at the center of the support end face 421 of the diamond anvil 400, the sample should be placed flat at the center of the diamond.

[0083] (7) As Figure 11 shown, the opposed anvil pressure device of this embodiment can simultaneously realize spectral measurements in various incident and outgoing forms. Exemplarily, the opposed anvil pressure device of this embodiment can realize spectral measurements including vertical incidence - vertical reflection / scattering, vertical incidence - vertical transmission, vertical incidence - oblique reflection / scattering, vertical incidence - oblique transmission, oblique incidence - oblique reflection / scattering, oblique incidence - vertical reflection / scattering, oblique incidence - vertical transmission, oblique incidence - oblique transmission, etc.

[0084] In this embodiment, the materials used for the piston 200, the cylinder 100, and the spacer 300 are 40Cr steel, and then heat treatment is performed to make the hardness reach HRC55 - 60, and the overall machining accuracy is less than 20 microns. The diamond is processed on the basis of the Type IIac diamond anvil 400 grown by CVD. The diameter of the upper table surface of the diamond anvil 400 is 800 microns, and the overall machining accuracy is better than 10 microns.

[0085] See Figure 12 , Figure 12 For the fluorescence peaks of the ruby ball in the opposed anvil pressure device processed by the aforementioned method under different pressures. Among them, the pressure in the left figure is 0 GPa, and the pressure in the right figure is 13.2 GPa.

[0086] Specifically, using the opposed anvil pressure device of this embodiment for actual pressure testing, the diameter of the support end face 421 of the diamond anvil 400 is 800 microns, the gasket is a brass gasket, the pressure transmitting medium is silicone oil, the standard pressure medium is a ruby ball, the test system is a fluorescence standard pressure system, the test laser wavelength is 532 nm, and the pressure test results are as Figure 12 shown. After testing, after pressurizing to 13.2 GPa and maintaining for a period of time, and then depressurizing to atmospheric pressure, the diamond is intact, and during this period, direct incidence and oblique incidence spectral measurements can be carried out at any time, proving that the opposed anvil pressure device of this embodiment can complete the test.

[0087] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0088] The terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise specified, the meaning of "a plurality" is two or more.

[0089] In the description of the present application, it should be noted that unless otherwise clearly specified or limited, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0090] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any one or more embodiments or examples in a suitable manner.

[0091] It should be understood that although each step in the flowchart of the accompanying drawings is shown sequentially as indicated by the arrows, these steps are not necessarily executed sequentially in the order indicated by the arrows. Unless clearly stated herein, the execution of these steps is not strictly limited in order, and they may be executed in other orders. Moreover, at least a part of the steps in the flowchart of the accompanying drawings may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same time, but may be executed at different times, and their execution order is not necessarily sequential, but may be executed alternately or in turn with at least a part of other steps or sub-steps or stages of other steps.

Claims

1. An anvil pressurizing device, characterized in that: include: A cylinder, wherein a first light through hole and a second light through hole are provided on a first end surface of the cylinder, wherein an extension direction of the first light through hole is perpendicular to the first end surface, and an extension direction of the second light through hole is inclined relative to the first end surface; A piston, matched with the cylinder, the piston is provided with a third light through hole and a fourth light through hole, the third light through hole is located on the extension line of the extension direction of the first light through hole, the fourth light through hole is located on the extension line of the extension direction of the second light through hole, and an accommodating cavity is defined between the piston and the cylinder; A cushion block module, comprising two cushion blocks arranged at an interval, wherein any one of the cushion blocks is provided with a fixing groove on a side close to the other cushion block, wherein the fixing groove comprises a first plane and a second plane, wherein the first plane is parallel to the first end surface, and the second plane is perpendicular to an extension direction of the second light-through hole; Two anvils are arranged opposite to each other, each of the anvils comprises a matching portion and a supporting portion, each matching portion matches with one of the fixing grooves respectively, the two supporting portions are arranged opposite to each other, and the end surface of the supporting portion is parallel to the first end surface; the matching portion comprises a matching plane and a matching inclined surface; The extension direction of the first light hole and the extension direction of the second light hole intersect on the end surface of the support portion close to the first light hole; the first light hole, the second light hole, the third light hole and the fourth light hole are tapered holes.

2. The anvil pressurizing device according to claim 1, characterized in that: The exact center of the end surface of the supporting portion is located at the extension line of the extending direction of the second light-through hole.

3. The anvil pressurizing device according to claim 1, characterized in that: A first avoidance hole and a second avoidance hole are provided on the pad block near the first light-through hole, the size of the first avoidance hole is smaller than the size of the matching plane, and the size of the second avoidance hole is smaller than the size of the matching inclined surface; and / or, a third avoidance hole and a fourth avoidance hole are provided on the pad block near the three light-through holes, the third avoidance hole is located on the line connecting the first light-through hole and the third light-through hole, and the fourth avoidance hole is located on the line connecting the second light-through hole and the fourth light-through hole.

4. The anvil pressurizing device according to claim 1, characterized in that: The first plane and the second plane are mirror-polished surfaces.

5. The anvil pressurizing device according to claim 4, characterized in that: The anvil is provided with a chamfer at a junction corresponding to the first plane and the second plane.

6. The anvil pressurizing device according to claim 1, characterized in that: The cylinder is provided with a first matching cavity, and the piston comprises an end portion and a guide portion, wherein the guide portion is connected to the end portion, and the guide portion matches with the first matching cavity.

7. The anvil pressurizing device according to claim 1 or 6, characterized in that: The cylinder and the piston are both provided with pressurized threaded holes.

8. The anvil pressurizing device according to claim 1, characterized in that: There are two second light-through holes, which are respectively located on both sides of the first light-through hole, and the axis of each second light-through hole intersects with the axis of the first light-through hole on the end surface of the support portion.

9. The anvil pressurizing device according to claim 1, characterized in that: An observation hole is arranged on the circumferential side of the cylinder.

10. A method for assembling an anvil pressurizing device, characterized in that: The anvil pressurizing device according to any one of claims 1 to 9 comprises the following steps: The mating portion of one anvil is fixed to the fixing groove of one of the cushion blocks by bonding, and the mating portion of the other anvil is fixed to the fixing groove of the other cushion block by bonding; Fix two pads on the piston and the cylinder respectively; Make the piston fit with the cylinder.

Images