Alignment anvil pressurizing device and assembling method

Abstract

The embodiment of the invention provides an anvil cell pressurizing device and an assembling method, and relates to the technical field of high-pressure optical physical in-situ measurement device.The anvil cell pressurizing device comprises a cylinder, a first light-transmitting hole and a second light-transmitting hole, the extending direction of the first light-transmitting hole is perpendicular to a first end face, and the extending direction of the second light-transmitting hole is perpendicular to a second end face; the extending direction of the second light through hole is inclined relative to the first end surface; the piston is provided with a third light through hole and a fourth light through hole; the cushion block module comprises two cushion blocks which are arranged in a spaced mode, and a fixing groove is formed in the side, close to the other cushion block, of any cushion block; and the two pressing anvils are oppositely arranged, each pressing anvil comprises a matching part and a supporting part, and each matching part is matched with one fixing groove. In the embodiment of the invention, not only can linear optical measurement be carried out, but also oblique incidence type optical measurement can be carried out, and high-pressure optical experiments in different measurement modes, especially optical experiments needing a non-collinear form of light beams, can be met; and meanwhile, the bearing strength of the anvil can be effectively improved.

Description

Technical Field

[0001] The present application relates to the technical field of high-pressure optical physics in-situ measurement devices, and in particular to an anvil pressurizing device and an assembly method. Background Art

[0002] In the related art, the diamond anvil cell (DAC) used in high-pressure optical testing experiments uses a direct incident light beam to measure the properties of samples under high pressure, 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 optical pump-probe experiments, etc. Although the type of diamond anvil cell can be improved, such as using a Boehler-type diamond anvil cell with a large opening angle, these diamond opening angles are also limited, and will greatly reduce the upper limit of diamond pressure loading. Summary of the invention

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes an anvil pressurizing device that can perform not only direct-incidence optical measurement but also oblique-incidence optical measurement, while also facilitating the guarantee of pressure-bearing strength to meet common high-pressure optical measurement requirements.

[0004] An embodiment of one aspect of the present application provides an anvil pressurizing device, comprising:

[0005] 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;

[0006] 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;

[0007] 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;

[0008] 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;

[0009] Wherein, an extension direction of the first light through hole and an extension direction of the second light through hole intersect on an end surface of the support portion close to the first light through hole.

[0010] Furthermore, the exact center of the end surface of the supporting portion is located at the extension line of the extension direction of the second light-transmitting hole.

[0011] Further, a first avoidance hole and a second avoidance hole are provided in a pad block near the first light-through hole, the mating portion includes a mating plane and a mating inclined surface, the size of the first avoidance hole is smaller than the size of the mating plane, and the size of the second avoidance hole is smaller than the size of the mating inclined surface; and / or, a third avoidance hole and a fourth avoidance hole are provided in a pad block near the three light-through holes, the third avoidance hole is located on a line connecting the first light-through hole and the third light-through hole, and the fourth avoidance hole is located on a line connecting the second light-through hole and the fourth light-through hole.

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

[0013] Furthermore, the anvil is provided with a chamfer at a junction between the first plane and the second plane.

[0014] Further, the cylinder is provided with a first matching cavity, the piston comprises an end portion and a guide portion, the guide portion is connected to the end portion, and the guide portion matches with the first matching cavity.

[0015] Furthermore, the cylinder and the piston are both provided with pressurized threaded holes.

[0016] Furthermore, 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 of the second light-through holes intersects with the axis of the first light-through hole on the end surface of the support portion.

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

[0018] Another aspect of the present application provides an assembly method of an anvil pressurizing device, which is applied to the anvil pressurizing device as described above, and includes the following steps:

[0019] 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;

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

[0021] Make the piston fit with the cylinder.

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

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

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0025] Figure 1 A schematic diagram of the structure of an anvil pressurizing device provided in one embodiment of the present application;

[0026] Figure 2 for Figure 1 Schematic diagram of the cross-section structure of AA;

[0027] Figure 3 A schematic diagram of the structure of a cylinder in an anvil pressurizing device provided in one embodiment of the present application;

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

[0029] Figure 5 A schematic diagram of the structure of a piston in an anvil pressurizing device provided in one embodiment of the present application;

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

[0031] Figure 7 A schematic diagram of the structure of a cushion block in an anvil pressure device provided in one embodiment of the present application;

[0032] Figure 8 A schematic structural diagram of a cushion block in an anvil pressurizing device provided in an embodiment of the present application from another perspective;

[0033] Fig. 9A schematic cross-sectional view of a cushion block in an anvil pressure device provided in one embodiment of the present application;

[0034] Fig.10 A schematic diagram of the structure of an anvil in an anvil pressurizing device provided in one embodiment of the present application;

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

[0036] Fig.12 This is the fluorescence peak of the ruby ​​ball under different pressures in an embodiment of the present application, wherein the pressure in the left picture is 0 GPa, the pressure in the right picture is 13.2 GPa, and the diameter of the anvil table used is 800 microns.

[0037] Reference numerals:

[0038] 100, cylinder; 110, first matching cavity; 120, observation hole; 130, first end surface; 140, first light through hole; 150, second light through hole; 160, pressurized threaded hole;

[0039] 200, piston; 210, end portion; 220, guide portion; 230, third light through hole; 240, fourth light through hole;

[0040] 300, pad; 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, anvil; 410, mating portion; 411, mating plane; 412, mating inclined surface; 420, supporting portion; 421, supporting end surface. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

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

[0044] Diamond anvil cell (DAC for short) is an important experimental tool for studying the properties of matter under extremely high pressure. It is widely used in research fields such as planetary and earth sciences, condensed matter physics, chemistry, and materials science. Conventional DAC is mainly composed of three parts: diamond anvils, gaskets, and support guides. The conventional S-type DAC commonly used in experiments uses a pressurized wrench or auxiliary means such as air film pressurization to squeeze the piston and cylinder parts, and then squeeze the diamond anvil bonded to the gasket, generating pressure on the sample cavity, thereby generating 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 conical holes in the front and back to facilitate optical experimental detection.

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

[0046] However, the DACs used in existing high-pressure optical testing experiments all use a straight-incidence beam to measure the properties of samples under high pressure, that is, the incident light is collinear with the reflected light, scattered light, and transmitted light. This approach 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, these diamond opening angles are also limited and will greatly reduce the upper limit of diamond pressure loading.

[0047] In view of this, an embodiment of the first aspect of the present application discloses an anvil pressurizing device to effectively solve the aforementioned problem.

[0048] See also Figures 1 to 10 As shown, an embodiment of the first aspect of the present application discloses an anvil pressurizing device, comprising a cylinder 100 , a piston 200 , a cushion block module and an anvil 400 .

[0049] Specifically, the first end surface 130 of the cylinder 100 is provided with a first light hole 140 and a second light hole 150, the extension direction of the first light hole 140 is perpendicular to the first end surface 130, and the extension direction of the second light hole 150 is inclined compared to the first end surface 130; the piston 200 cooperates with the cylinder 100, and the piston 200 is provided with a third light hole 230 and a fourth light hole 240, the third light hole 230 is located on the extension line of the extension direction of the first light hole 140, and the fourth light hole 240 is located on the extension line of the extension direction of the second light hole 150, and an accommodating cavity is defined between the piston 200 and the cylinder 100; the pad module includes a spacer There are two cushion blocks 300, any one of the cushion blocks 300 is provided with a fixing groove 310 on a side close to the other cushion block 300, 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 extension direction of the second light-transmitting hole 150; there are two anvils 400, the two anvils 400 are arranged opposite to each other, each anvil 400 includes a matching portion 410 and a supporting portion 420, each matching portion 410 is matched with a fixing groove 310 respectively, the two supporting portions 420 are arranged opposite to each other, and the end face of the supporting portion 420, i.e. the supporting end face 421, is parallel to the first end face 130.

[0050] The extension direction of the first light through hole 140 and the extension direction of the second light through hole 150 intersect at the support end surface 421 of the support portion 420 close to the first light through hole 140 .

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

[0052] In some embodiments of the present application, the center of the end surface of the support portion 420 is located at the extension line of the extension direction of the second light through hole 150. Specifically, the end surface of the support portion 420 is a support end surface 421, and the support end surface 421 is used to abut against the sample.

[0053] Furthermore, the center of the support end surface 421 is also located on the extension line of the extension direction of the first light hole 140. In this way, no matter when the incident light enters from the first light hole 140 or the second light hole 150, the incident light can pass through the center of the support end surface 421 and then irradiate the sample.

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

[0055] It is worth to understand that in the embodiment of the present application, both cushion blocks 300 are provided with avoidance holes for light to pass through.

[0056] For details, see Figure 1 and Figure 2 , Fig. 9 and Fig.10 , a first avoidance hole 320 and a second avoidance hole 330 are provided on the pad 300 relatively close to the first light through hole 140 of the two pads 300, the matching portion 410 includes a matching plane 411 and a matching inclined surface 412, the size of the first avoidance hole 320 is smaller than the size of the matching plane 411, and the size of the second avoidance hole 330 is smaller than the size of the matching inclined surface 412. The extension direction of the first avoidance hole 320 is consistent with the extension direction of the first light through hole 140, so that the light beam incident from the first light through hole 140 can pass through the first avoidance hole 320 and irradiate the sample; similarly, the extension direction of the second avoidance hole 330 is consistent with the extension direction of the second light through hole 150.

[0057] It is worth understanding that the size of the first avoidance hole 320 is smaller than the size of the matching plane 411, which means that the size of the first avoidance hole 320 at the abutment with the anvil 400 is smaller than the size of the matching plane 411, so that the catalyst leakage can be prevented when the anvil 400 is bonded to the cushion block 300; similarly, the size of the second avoidance hole 330 is smaller than the size of the matching inclined surface 412, which means that the size of the second avoidance hole 330 at the abutment with the anvil 400 is smaller than the size of the matching inclined surface 412. In this way, the catalyst leakage can be prevented when the anvil 400 is bonded.

[0058] Furthermore, the pad block 300 near the three light holes is provided with a third avoidance hole 340 and a fourth avoidance hole 350 . The third avoidance hole 340 is located on the line connecting the first light hole 140 and the third light hole 230 , and the fourth avoidance hole 350 is located on the line connecting the second light hole 150 and the fourth light hole 240 .

[0059] Among them, the extension direction of the third avoidance hole 340 is consistent with the extension direction of the first light hole 140, so that the light emitted from the first light hole 140 can pass through the third avoidance hole 340 and illuminate the sample; similarly, the extension direction of the fourth avoidance hole 350 is consistent with the extension direction of the second light hole 150.

[0060] In some embodiments of the present application, see Figures 1 to 3 , Figure 5 and Figure 6The cylinder 100 is provided with a first matching cavity 110, and the piston 200 includes an end portion 210 and a guide portion 220, the guide portion 220 is connected to the end portion 210, and the guide portion 220 matches the first matching cavity 110. By matching the guide portion 220 with the first matching cavity 110, it can be ensured that the moving trajectory of the piston 200 and the cylinder 100 is on a preset trajectory during the pressurization process. In this way, the high-pressure optical measurement effect can be guaranteed.

[0061] In some embodiments of the present application, see Figure 7 and Fig. 9 , the first plane 311 and the second plane 312 are mirror polished surfaces. 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, the size and surface flatness of the first plane 311 and the second plane 312 can be ensured, which is conducive to improving the force strength between the anvil 400, thereby ensuring the pressure bearing strength.

[0062] Furthermore, the anvil 400 is provided with a chamfer at the junction of the first plane 311 and the second plane 312. Specifically, the mating portion 410 of the anvil 400 is in abutment with the first plane 311 and the second plane 312 of the fixing groove 310, and the mating portion 410 includes a mating plane 411 and a mating inclined surface 412, and a chamfer is provided between the mating plane 411 and the mating inclined surface 412. By machining the chamfer on the mating surface of the anvil 400 and the fixing groove 310, a sharp transition surface can be avoided on the surface where the anvil 400 contacts the cushion block 300, thereby facilitating the improvement of the pressure bearing strength of the anvil 400.

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

[0064] In some embodiments of the present application, see Figure 3 and Figure 5 , the cylinder 100 and the piston 200 are both provided with a pressurizing threaded hole 160. After the pressurizing threaded hole 160 of the cylinder 100 and the pressurizing threaded hole 160 of the piston 200 are aligned, by inserting a fastening bolt through the pressurizing threaded holes 160 of the two, the cylinder 100 and the piston 200 can be moved toward each other, thereby changing the pressure on the sample.

[0065] In this embodiment, the cylinder 100 is provided with a plurality of pressurized threaded holes 160, and the plurality of pressurized threaded holes 160 are arranged in a circular array along the axis of the first light-transmitting hole 140, wherein the end 210 of the piston 200 is provided with a plurality of pressurized threaded holes 160, and the positions thereof correspond to the pressurized threaded holes 160 in the cylinder 100. In this embodiment, the pressurized threaded holes 160 are arranged at even intervals in the circumferential direction. Thus, the sample can be subjected to even force in the circumferential direction.

[0066] In some embodiments of the present application, see 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 incident light or 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 table. Of course, in other embodiments, anvils 400 of different tables and types can also be selected according to the pressure range required by the specific experiment. The material of the anvil 400 includes but is not limited to diamond, silicon carbide, aluminum oxide, zirconium oxide, etc.

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

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

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

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

[0072] The mating portion 410 of one anvil 400 is fixed to the fixing groove 310 of one of the cushion blocks 300 by bonding, and the mating portion 410 of the other anvil 400 is fixed to the fixing groove 310 of the other cushion block 300 by bonding;

[0073] The two cushion blocks 300 are fixed to the piston 200 and the cylinder 100 respectively;

[0074] The piston 200 is mated with the cylinder 100 .

[0075] The following is a detailed description of the anvil pressurizing device and assembly method of the embodiment of the present application with specific embodiments. It should be noted that the following embodiments are only exemplary descriptions and should not be understood as limiting the embodiments of the present application.

[0076] See also Figures 1 to 10 As shown, the anvil pressure device of this embodiment includes a cylinder 100 , a piston 200 , a cushion 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 follows: Figures 3 to 6 As shown. First, determine the size of the piston 200, cylinder 100, pad 300 and anvil 400. In this embodiment, the common conventional S-type DAC is used. Of course, in other embodiments, other styles of DAC can also be used. The height of the DAC piston 200 module is 23mm, the bottom diameter is 47.7mm, the height of the piston 200 part is 15.2mm, the outer diameter is 18.8mm, and the inner diameter is 14.8mm; the height of the cylinder 100 module is 26.3mm, the bottom diameter is 47.7mm, the diameter of the cylinder 100 part is 18.82mm, and the height is 15.2mm. Then, on the basis of retaining the compressive strength of the press and the original light-through hole, an oblique incident conical light-through hole, i.e., the second light-through hole 150, is added. The angle at which the second light-through hole 150 intersects with the first end face 130 is 40 degrees. In other embodiments, it can also be designed to a specific angle according to specific experimental needs, but it should be noted that it cannot intersect with the first light-through hole 140. During design, the height of the cushion block 300 and the anvil 400 should be set at the same time to ensure that the convergence vertices of the first light-through hole 140 and the second light-through hole 150 are at the exact center of the support end surface 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 exact center of the upper surface of the anvil 400, and the draft circle diameter is 12 mm. The second light-through hole 150 needs to avoid the pressurized threaded hole 160. Among them, the first light-through hole 140 and the second light-through hole 150 are both tapered holes. In the actual design process, the angle and size of the tapered 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 breaking under high pressure.

[0078] (2) Design the pad 300, such as Figures 7 to 9As shown. The height of the pad 300 is 5.6mm, and the bottom and top diameters are 13mm and 11.22mm respectively. The original light-through hole, i.e., the first avoidance hole 320 (or the third avoidance hole 340), is retained, and an oblique incident conical light-through hole consistent with the above angle is added, i.e., the second avoidance hole 330 (or the fourth avoidance hole 350), to ensure that the oblique incident light beam passes through without affecting the vertically incident light beam. The bottom diameter of the second avoidance hole 330 must be greater than or equal to the top diameter of the conical light-through hole of the press to ensure that light is not blocked. The diameter of the junction between the first avoidance hole 320 and the second avoidance hole 330 and the fixing groove 310 is about 1.2mm, which is larger than the spot diameter in most optical experiments. A U-shaped fixing groove 310 is processed on the top of the pad 300 for bonding a specially designed diamond anvil 400. The fixed groove 310 includes a first plane 311 and a second plane 312 inclined at both sides of the first plane 311. The first plane 311 is the bottom surface of the groove, and the second plane 312 is the side surface of the groove. The first plane 311 is perpendicular to the first light hole 140, and the second plane 312 is perpendicular to the second light hole 150. The depth of the fixed groove 310 needs to be designed separately considering the diamond anvil 400 used. The basis of the design is to ensure that the convergence vertex of the second light hole 150 is at the center of the upper surface of the diamond anvil 400. In this embodiment, the depth of the fixed groove 310 is 1.1mm, the bottom width is 1.14mm, and the top width is 3.76mm. Among them, the surface of the fixed groove 310 is mirror polished to ensure the size and surface flatness, which is conducive to improving the force strength between the pad 300 and the diamond anvil 400.

[0079] (3) Processing a conventional diamond anvil 400, such as Fig.10As shown. The anvil 400 has a support portion 420, and the support end face 421 of the support portion 420 has a diameter of 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-through hole 150, namely the matching bevel 412, are cut at the bottom of the anvil 400 to ensure that the light beam can be incident on the sample perpendicular to the diamond. A partial plane, namely the matching plane 411, is retained at the bottom of the anvil 400 to ensure that the vertically incident light beam can be perpendicular to the matching plane 411 and incident on the sample surface. The size of the matching bevel 412 and the matching plane 411 should be larger than the size of the avoidance hole on the pad 300 to prevent the catalyst from leaking when the diamond anvil 400 is bonded. It should be pointed out that the machined matching plane 411 and the matching bevel 412 should be strictly consistent with the size of the above-mentioned fixing groove 310 to ensure uniform force. Since the edges between the surfaces of the fixing groove 310 on the pad 300 will inevitably have errors when processing, the matching plane 411 and the matching inclined surface 412 on the anvil 400 need to be chamfered with a chamfer size of 30 microns. In this way, a sharp transition surface can be formed on the lower surface of the diamond anvil 400, which is conducive to improving the diamond pressure bearing strength.

[0080] (4) Steps are also processed in some areas of the cylinder 100 and the piston 200 to prevent the second light hole 150 from being blocked.

[0081] (5) Assemble the DAC according to the DAC assembly process, bond the diamond to the spacer 300 with epoxy resin, and then fix the spacer 300 to the piston 200 and cylinder 100 modules with a screw. The bonding and fixing process should be carried out under a microscope. Not only should the upper surfaces of the two diamond anvils 400 (i.e., the supporting end faces 421) be as parallel as possible, but also the supporting end faces 421 of the diamond anvils 400 should be visible in each light hole.

[0082] (6) The steps of drilling, loading, pressurizing, and testing are the same as those of conventional DAC. It is worth noting that since the convergence vertex of the obliquely incident second light hole 150 is at the center of the supporting end surface 421 of the diamond anvil 400, the sample should be placed flat at the center of the diamond.

[0083] (7) Fig.11 As shown, the anvil pressurizing device of the present embodiment can realize spectral measurements of multiple incident and output forms at the same time. Exemplarily, the anvil pressurizing device of the present 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, and oblique incidence-oblique transmission.

[0084] (8) In this embodiment, the piston 200, the cylinder 100 and the pad 300 are made of 40Cr steel, which is heat treated to achieve a hardness of HRC55-60, and the overall processing accuracy is less than 20 microns. The diamond is processed on the basis of a Type IIac diamond anvil 400 grown by CVD, the upper table diameter of the diamond anvil 400 is 800 microns, and the overall processing accuracy is better than 10 microns.

[0085] See also Fig.12 , Fig.12 These are the fluorescence peaks of the ruby ​​ball in the anvil pressurizing device processed by the aforementioned method at different pressures, where the pressure in the left figure is 0 GPa and the pressure in the right figure is 13.2 GPa.

[0086] Specifically, the anvil pressure device of this embodiment is used to perform an actual pressure test. The diameter of the support end face 421 of the diamond anvil 400 is 800 microns, the gasket is a brass gasket, the pressure transmission medium is silicone oil, the standard pressure medium is a ruby ​​ball, the test system is a fluorescent standard pressure system, and the test laser wavelength is 532nm. The pressure test results are as follows: Fig.12 After testing, after the pressure was increased to 13.2 GPa and maintained for a period of time, the pressure was then released to normal pressure, and the diamond was intact. During this period, the spectral measurement at direct incidence and oblique incidence could be performed at any time, proving that the anvil pressurizing device of this embodiment can complete the test.

[0087] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply 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 understood as a limitation on the present application.

[0088] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0089] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

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

[0091] It should be understood that, although the steps in the flowchart of the accompanying drawings are displayed in sequence as indicated by the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and they can 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, and these sub-steps or stages are not necessarily executed at the same time, but can be executed at different times, and their execution order is not necessarily sequential, but can be executed in turn or alternately with other steps or at least a part of the 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; Wherein, an extension direction of the first light through hole and an extension direction of the second light through hole intersect on an end surface of the support portion close to the first light through hole.

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 mating portion includes a mating plane and a mating inclined surface, the size of the first avoidance hole is smaller than the size of the mating plane, and the size of the second avoidance hole is smaller than the size of the mating 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.

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