Large-size high-quality synthetic diamond synthesis apparatus

Abstract

The application discloses a large-size high-grade artificial diamond synthesis device and relates to the technical field of diamond synthesis equipment. The large-size high-grade artificial diamond synthesis device comprises a symmetrical ultrahigh-pressure loading mechanism, a composite pressure-bearing cavity, a temperature control system, a high-purity raw material packaging system and a safety protection system. The symmetrical ultrahigh-pressure loading mechanism adopts a six-surface top symmetrical hydraulic pressure loading structure, comprising six main pressure heads and edge auxiliary pressure compensation rings. The six main pressure heads and the edge auxiliary pressure compensation rings are in a split structure, each main pressure head and pressure compensation ring is provided with an independent servo hydraulic cylinder, thereby forming double-stage loading of the main pressure head center main pressure and the pressure compensation ring edge auxiliary pressure. The main pressure head comprises a first hydraulic cylinder, the end of the first hydraulic cylinder is fixedly connected with a base block, and the head surface of the base block is fixedly connected with a first pressure block. The double-stage loading of the main pressure head center main pressure and the pressure compensation ring edge auxiliary pressure improves the accuracy of pressure output and the rapidness of loading response.

Description

Technical Field

[0001] This invention relates to the field of diamond synthesis equipment technology, specifically to a large-size, high-grade synthetic diamond synthesis device. Background Technology

[0002] Synthetic diamonds are widely used in high-end fields such as precision cutting tools, optical windows, and advanced grinding due to their excellent hardness, wear resistance, thermal conductivity, and optical properties. With the development of downstream industries, the demand for large-size (single crystal size ≥12mm, polycrystalline preform size ≥60mm) and high-grade (low defects, high purity, high wear resistance) synthetic diamonds is becoming increasingly urgent.

[0003] Currently, synthetic diamonds are mainly synthesized via the static high-temperature, high-pressure (HPHT) catalytic method, with the core equipment being an ultra-high-pressure synthesis apparatus. Existing synthesis apparatuses have shortcomings for large-size, high-grade synthetic diamonds: large-size synthesis chambers are prone to edge pressure attenuation, leading to excessive pressure gradients between the center and edges of the chamber. This results in defects such as lattice cracking, dislocations, and inclusions during diamond growth, affecting product quality. Existing pressurization mechanisms mostly use uniform hydraulic drives, which lack sufficient pressure compensation capabilities and cannot effectively counteract edge pressure attenuation. Therefore, developing an apparatus capable of solving edge pressure attenuation and adapted for the synthesis of large-size, high-grade diamonds has become a pressing technical problem in this field. Summary of the Invention

[0004] The purpose of this invention is to provide a large-size, high-grade synthetic diamond synthesis device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a large-size, high-grade synthetic diamond synthesis device, comprising a symmetrical ultra-high pressure loading mechanism, a composite pressure-bearing cavity, a temperature control system, a high-purity raw material packaging system, and a safety protection system; The symmetrical ultra-high pressure loading mechanism adopts a six-sided top symmetrical hydraulic pressurization structure, including a six-sided main pressure head and an edge auxiliary pressure compensation ring; The six-sided main pressure head and the edge auxiliary pressure ring are a split structure. Each main pressure head and pressure ring is equipped with an independent servo hydraulic cylinder, forming a two-stage loading of the main pressure head center main pressure and the pressure ring edge auxiliary pressure. The main pressure head includes a first hydraulic cylinder, a base block is fixedly connected to the end of the first hydraulic cylinder, and a first pressure block is fixedly connected to the middle of the head surface of the base block; the tail side of the first pressure block is uniformly provided with sliding grooves; and cylinder grooves are uniformly provided at equal intervals on the edge of the head surface of the base block. The pressure ring includes a base plate that is slidably sleeved with a first pressure block. A second hydraulic cylinder is fixedly and uniformly at equal intervals on the tail surface of the base plate and embedded in a cylinder groove. A centrally symmetrical second pressure block is fixedly and uniformly at equal intervals on the head surface of the base plate. The second pressure blocks are arranged in a ring shape and fit against the first pressure block. The outer side of the head of the second pressure block is chamfered. A slider corresponding to the sliding groove is fixedly connected to the inner side of the tail of the second pressure block. The six-sided main pressure head is provided with a protective cover for embedding the first hydraulic cylinder. The corners of the protective cover are equipped with safety doors, and a base is fixed to the lower side of the protective cover. The composite pressure-bearing cavity includes an external first cavity structure and an internal second cavity structure.

[0006] As a preferred embodiment of the present invention, the first cavity mechanism includes an alloy sleeve assembly, a high-strength steel wire prestressed winding assembly, and a confining pressure auxiliary loading assembly; The alloy sleeve assembly is an improved cubic structure, and its outline is provided with a confining pressure auxiliary loading component; The alloy sleeve assembly includes a side sleeve and upper and lower plugs; an arc groove is formed in the middle of the inner side of both the sleeve and the plug; The confining pressure auxiliary loading component includes a rib hoop fixed to the four sides of the outer side of the sleeve and a ring hoop fixed to the outer edge of the plug.

[0007] As a preferred embodiment of the present invention, a high-strength steel wire prestressed winding assembly is provided in the middle of the outer side of both the sleeve and the plug; The prestressed wire winding assembly includes a swivel base of a fixed alloy sleeve assembly, a rotating disk is rotatably sleeved at the end of the swivel base, a winding column inserted into the swivel base is fixedly connected to the center of the tail face of the rotating disk, and steel ropes are fixedly connected to the winding column at equal intervals and evenly. The initial horizontal steel rope fixing rib of the prestressed wire winding assembly on the sleeve, and the subsequent vertical and diagonal steel rope fixing ring rib. The initial fixing ring of the steel rope of the prestressed winding assembly of the steel wire on the plug.

[0008] As a preferred embodiment of the present invention, the outer surface of the alloy sleeve assembly is provided with a constraint component corresponding to the steel wire prestressed winding assembly. The constraint component includes a first pressure transmitting medium that is embedded with the steel wire prestressed winding assembly, and the first pressure transmitting medium is embedded with nested rings.

[0009] As a preferred embodiment of the present invention, the second cavity mechanism includes a six-sided alloy plate, the inner side edge of the alloy plate being chamfered to form a conical interlocking surface; the corners of the second cavity mechanism form triangular pyramidal notches; A second pressure-transmitting medium with a matching fitting arc groove is fixedly embedded in the middle of the outer side of the alloy plate. An oblique connecting strip is fixedly connected at equal intervals on the outer side of the tail of the second pressure-transmitting medium. The connecting strip is embedded in the alloy plate and extends into the notch. The notch is filled with a sealing block to secure the connecting strip; The alloy plate has a first groove in the middle of its inner side surface.

[0010] As a preferred embodiment of the present invention, the composite pressure-bearing cavity is internally arranged with partitioned composite pressure-transmitting media. The first pressure-transmitting media filling the edge of the composite pressure-bearing cavity is a soft pressure-transmitting media with high compressibility and high pressure-transmitting efficiency, while the second pressure-transmitting media filling the center of the composite pressure-bearing cavity is a hard pressure-transmitting media with low compressibility and high stability.

[0011] As a preferred embodiment of the present invention, the high-purity raw material packaging system is located in a composite pressure-bearing cavity, including an inner mold assembly for high-purity carbon source, catalyst, seed crystal orientation fixation and vacuum sealing, and a bushing assembly assembled together. The inner mold assembly includes a spherical inner mold, and each of the six sides of the inner mold has a second groove. The bushing assembly is adapted between the inner mold assembly and the second cavity mechanism, including a cubic bushing, and the bushing has a mold groove adapted to the inner mold. The bushing has a bushing assembly embedded on all six sides. The bushing assembly includes a first bushing with an outer side adapted to a first groove and a second bushing with an inner side adapted to a second groove.

[0012] Compared with the prior art, the beneficial effects of the present invention are: (1) A large-size high-grade synthetic diamond synthesis device adopts a split structure of a six-sided main pressure head and an edge auxiliary pressure ring, and each pressure head and pressure ring is equipped with an independent servo hydraulic cylinder. This eliminates the disadvantages of pressure regulation by the traditional six-sided top unified hydraulic drive, forming a two-stage loading of the main pressure head center pressure and the pressure ring edge auxiliary pressure, thereby improving the accuracy of pressure output and the speed of loading response.

[0013] (2) A large-size high-grade synthetic diamond synthesis device, wherein the second hydraulic cylinder in the cylinder groove can make the second pressure block apply the compensation pressure to the edge of the composite pressure-bearing cavity through the base plate, and the confining pressure auxiliary loading component on the outline of the alloy sleeve component forms an arc transition at its corner and is thicker than the central area, thereby reducing the edge pressure attenuation, stabilizing the pressure difference of the entire composite pressure-bearing cavity, realizing the isostatic pressure of the entire large-size cavity, providing a stable pressure field to improve the uniformity of diamond growth.

[0014] (3) A large-size high-grade synthetic diamond synthesis device, when placing the composite pressure-bearing cavity of the high-purity raw material packaging system, raises the second pressure block around the first pressure block, so that the head surface of the first pressure block and the end of the second pressure block form a height difference. With the constraint component set on the outer side of the alloy sleeve assembly, the first pressure transmission medium is inserted into the groove formed by the height difference, so that the composite pressure-bearing cavity can be placed more stably and the operation stability can be improved.

[0015] (4) A large-size high-grade synthetic diamond synthesis device, wherein the steel rope of the prestressed wire winding assembly provides pre-tightening constraint force at the edge of the alloy sleeve assembly, suppressing radial expansion and pressure relief at the edge of the composite pressure-bearing cavity under ultra-high pressure, thereby locking the edge pressure; and the auxiliary loading assembly thickens its edge to further enhance the local pressure-bearing capacity, avoiding pressure attenuation from the side wall of the cavity, thereby effectively controlling the pressure relief problem.

[0016] (5) A large-size high-grade synthetic diamond synthesis device, wherein the six-sided main pressure head can completely fit the six sides of the alloy sleeve assembly, enabling more uniform axial and radial loading, higher space utilization, and facilitating the directional growth of large-size block diamond blanks; the contour of the alloy sleeve assembly is provided with a confining pressure auxiliary loading component, forming a rounded transition at the corners and thickening it compared to the central area, thereby reducing the stress concentration at the corners, offsetting the defect of edge pressure attenuation, and improving the adaptability of the alloy sleeve assembly.

[0017] (6) A large-size high-grade synthetic diamond synthesis device, in which the six main pressure heads apply axial pressure to the composite pressure-bearing cavity through the constraint components during the pressurization process. The first pressure transmission medium will naturally flow and diffuse towards the edge with lower pressure due to the pressure. The added ring step will form a physical barrier. The vertical surface of the ring step can directly block the lateral flow of the first pressure transmission medium and prevent it from leaking into the edge gap.

[0018] (7) A large-size high-grade synthetic diamond synthesis device, wherein the ring step is closely fitted with the first pressure transmission medium. When subjected to force, it will generate a reverse clamping force on the first pressure transmission medium, guiding the first pressure transmission medium to feed the pressure back to the center of the composite pressure bearing cavity, reducing the pressure loss in the edge area, thereby achieving the effect of constraining the diffusion of the first pressure transmission medium and supplementing the edge load, and further optimizing the pressure uniformity of the cubic alloy sleeve assembly.

[0019] (8) A large-size high-grade synthetic diamond synthesis device, wherein a mold groove adapted to the inner mold is opened in the bushing to form a structure with thick edges and thin center. Relying on the rigid pressure transmission characteristics of the metal bushing, the pressure is blocked from buffering attenuation on the side wall of the composite pressure-bearing cavity, so as to realize the efficient and lossless transmission of ultra-high pressure load. The thickened bushing edge structure can directionally strengthen the pressure transmission at the edge of the composite pressure-bearing cavity, so that the load can be evenly penetrated to the edge core growth area, accurately compensate for the edge pressure attenuation, and further optimize the pressure uniformity of the entire large-size cavity.

[0020] (9) A large-size high-grade synthetic diamond synthesis device, wherein the bushing assembly is adapted between the inner mold assembly and the second cavity mechanism, and is tightly fitted with the second cavity mechanism and the inner mold assembly without gaps, eliminating the pressure transmission gaps on the side walls and preventing pressure leakage. It works in synergy with the design of the composite pressure-bearing cavity to ensure pressure balance in all aspects. The first bushing of the bushing assembly is adapted to fit into the first groove, and the second bushing of the bushing assembly is adapted to fit into the second groove, effectively reducing defects such as diamond misalignment and improving the stability and yield of large-size high-grade diamond synthesis. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the ultra-high pressure loading mechanism of the present invention; Figure 2 This is a schematic diagram of the pressure compensation ring of the present invention; Figure 3 This is a schematic diagram of the main pressure head of the present invention; Figure 4 This is a schematic diagram of the constraint component of the present invention; Figure 5 This is a schematic diagram of the first cavity mechanism of the present invention; Figure 6 This is a schematic diagram of the sleeve of the present invention; Figure 7 This is a schematic diagram of the plug of the present invention; Figure 8 This is a schematic diagram of the prestressed wire winding assembly of the present invention; Figure 9 This is a schematic diagram showing the location of the second cavity mechanism of the present invention; Figure 10 This is a schematic diagram of the second cavity mechanism of the present invention; Figure 11 This is a schematic diagram showing the location of the high-purity raw material packaging system of the present invention; Figure 12 This is a schematic diagram of the high-purity raw material packaging system of the present invention.

[0022] In the diagram: 1. Ultra-high pressure loading mechanism; 101. First hydraulic cylinder; 102. Base block; 103. First pressure block; 104. Slide groove; 105. Cylinder groove; 106. Base plate; 107. Second hydraulic cylinder; 108. Second pressure block; 109. Slider; 110. Protective cover; 111. Safety door; 112. Base platform; 2. First cavity mechanism; 201. Enclosure; 202. Plug; 203. Arc groove; 204. Rib hoop; 205. Ring hoop; 206. Rotary... 207. Seat; 208. Rotating disc; 209. Steel rope; 3. Second cavity mechanism; 301. Alloy plate; 302. Second pressure transmission medium; 303. Connecting bar; 304. Sealing block; 305. First groove; 4. Constraint assembly; 401. First pressure transmission medium; 402. Ring step; 5. High-purity raw material packaging system; 501. Inner mold; 502. Second groove; 503. Bushing; 504. Mold groove; 505. First liner; 506. Second liner. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Example: Please refer to Figures 1-12 A large-size, high-grade synthetic diamond synthesis device includes a symmetrical ultra-high pressure loading mechanism 1, a composite pressure-bearing cavity, a temperature control system, a high-purity raw material packaging system 5, and a safety protection system. The various systems work together to achieve the synthesis of large-size, high-grade synthetic diamonds based on a static high-temperature and high-pressure catalyst method. The symmetrical ultra-high pressure loading mechanism 1 adopts a six-sided top symmetrical hydraulic pressurization structure, including a six-sided main pressure head and an edge auxiliary pressure compensation ring; The six-sided main pressure head and the edge auxiliary pressure ring are separate structures. Each main pressure head and pressure ring is equipped with an independent servo hydraulic cylinder, forming a two-stage loading of the main pressure head center main pressure and the edge auxiliary pressure of the pressure ring; the edge auxiliary pressure ring can apply additional compensation pressure to reduce the pressure difference across the entire area; The main pressure head includes a first hydraulic cylinder 101, a base block 102 is fixedly connected to the end of the first hydraulic cylinder 101, and a first pressure block 103 is fixedly connected to the middle of the head surface of the base block 102; the tail side of the first pressure block 103 is evenly provided with sliding grooves 104; and the edge of the head surface of the base block 102 is evenly provided with cylinder grooves 105. The pressure ring includes a base plate 106 that is slidably sleeved on the first pressure block 103. The tail surface of the base plate 106 is uniformly fixed with a second hydraulic cylinder 107 that is embedded in the cylinder groove 105. The head surface of the base plate 106 is uniformly fixed with a centrally symmetrical second pressure block 108. The second pressure block 108 is arranged in a ring shape against the first pressure block 103. The outer side of the head of the second pressure block 108 is chamfered. The inner side of the tail of the second pressure block 108 is fixedly connected with a slider 109 that corresponds to the sliding groove 104. The six main pressure heads are provided with a protective cover 110 for the first hydraulic cylinder 101. Safety doors 111 are installed at the corners of the protective cover 110. A base 112 is fixed to the lower side of the protective cover 110. The ultra-high pressure loading mechanism 1 is also equipped with a laser displacement sensor and an automatic leveling module for pressure head off-center loading, which reduces the synchronization error of six-axis displacement. The composite pressure-bearing cavity includes an external first cavity mechanism 2 and an internal second cavity mechanism 3.

[0025] The first cavity mechanism 2 includes an alloy sleeve assembly, a high-strength steel wire prestressed winding assembly, and a confining pressure auxiliary loading assembly; The alloy sleeve assembly is an improved cubic structure with a confining pressure auxiliary loading component on its outline, and the corners are rounded and thicker than the central area. The alloy sleeve assembly includes a side sleeve 201 and upper and lower plugs 202; the inner side of both the sleeve 201 and the plugs 202 is provided with an arc groove 203, and the inner cavity of the alloy sleeve assembly forms a contour similar to a "cube-shaped waist drum". When pressure is applied, stress concentration occurs in the edge area, which automatically replenishes the edge pressure. The confining pressure auxiliary loading component includes a rib hoop 204 fixed to the four sides of the outer side of the sleeve 201 and a ring hoop 205 fixed to the outer edge of the plug 202; together with the ultra-high pressure loading mechanism 1, it forms a three-dimensional isostatic pressure loading of six-sided top pressure and circumferential confining pressure.

[0026] High-strength steel wire prestressed winding components are provided on the middle of the outer side of both the sleeve 201 and the plug 202; The prestressed wire winding assembly includes a swivel seat 206 of a fixed alloy sleeve assembly, a swivel disc 207 is rotatably sleeved at the end of the swivel seat 206, a winding post 208 inserted into the swivel seat 206 is fixedly connected to the middle of the tail face of the winding post 207, and steel ropes 209 are fixedly connected at equal intervals on the winding post 208. The transverse steel rope 209 of the prestressed wire winding assembly on the sleeve 201 is initially fixed to the rib hoop 204, and the vertical and diagonal steel ropes 209 are subsequently fixed to the ring hoop 205. The steel rope 209 of the prestressed wire winding assembly on the plug 202 is initially fixed to the hoop 205.

[0027] The outer surface of the alloy sleeve assembly is provided with a corresponding constraint component 4 covering the prestressed steel wire winding assembly. The constraint component 4 includes a first pressure transmitting medium 401 that is embedded with the prestressed steel wire winding assembly. The first pressure transmitting medium 401 has nested ring steps 402 embedded in it.

[0028] The second cavity mechanism 3 includes a six-sided alloy plate 301, the inner side edge of the alloy plate 301 is chamfered to form a conical interlocking surface; the corners of the second cavity mechanism 3 form triangular pyramidal notches; A second pressure transmitting medium 302 adapted to fit the fitting arc groove 203 is fixedly embedded in the middle of the outer side of the alloy plate 301. An oblique connecting strip 303 is fixedly connected at equal intervals on the outer side of the tail of the second pressure transmitting medium 302. The connecting strip 303 is embedded in the alloy plate 301 and extends into the notch. The notch is filled with sealing block 304 to secure the connecting strip 303; The inner side of the alloy plate 301 has a first groove 305.

[0029] The interior of the composite pressure-bearing cavity is arranged with a partitioned composite pressure-transmitting medium. The first pressure-transmitting medium 401, which is filled at the edge of the composite pressure-bearing cavity, is a soft pressure-transmitting medium with high compressibility and high pressure-transmitting efficiency. The second pressure-transmitting medium 302, which is filled at the center of the composite pressure-bearing cavity, is a hard pressure-transmitting medium with low compressibility and high stability. The pressure-transmitting medium is selected from one or more combinations of pyrophyllite, dolomite, or zirconia ceramics.

[0030] The high-purity raw material packaging system 5 is located in the composite pressure-bearing cavity, including a high-purity carbon source, catalyst, seed crystal orientation fixation and vacuum sealing inner mold assembly and assembled bushing assembly; The inner mold assembly includes a spherical inner mold 501, and each of the six sides of the inner mold 501 is provided with a second groove 502; The bushing assembly is adapted between the inner mold assembly and the second cavity mechanism 3, including a cubic bushing 503. The bushing 503 has a mold groove 504 adapted to the inner mold 501, forming a structure that is thick at the edges and thin at the center. The bushing 503 has a bushing assembly embedded on all six sides. The bushing assembly includes a first bushing 505 with the outer side adapted to the first groove 305 and a second bushing 506 with the inner side adapted to the second groove 502. The high-purity carbon source is nano-grade high-purity graphite powder, and the catalyst is a nickel-manganese-cobalt-based high-purity alloy catalyst; the inner mold component is used to fix the seed crystals in a directional manner to achieve large-size single crystal directional epitaxial growth. The temperature control system uses graphite resistance direct heating, with an operating temperature of 1350~1650℃ and a temperature control accuracy of ±5℃; it adopts an independent temperature control design for upper, middle and lower zones, with a temperature field uniformity of ≤±10℃; and it achieves non-contact temperature measurement through a fiber optic infrared pyrometer to avoid high voltage interference with temperature measurement accuracy. The safety protection system includes an automatic overpressure relief valve, hydraulic overload protection, high-temperature power failure protection, and a hard alloy pressure sleeve fatigue monitoring module, and is equipped with a fully enclosed protective shell.

[0031] The working principle of this invention is as follows: The symmetrical ultra-high pressure loading mechanism 1 adopts a six-sided top symmetrical hydraulic pressurization structure, including a six-sided main pressure head and an edge auxiliary pressure ring. It adopts a split structure of the six-sided main pressure head and the edge auxiliary pressure ring, and each pressure head and pressure ring is equipped with an independent servo hydraulic cylinder. It abandons the disadvantages of pressure regulation by the traditional six-sided top unified hydraulic drive, and forms a two-stage loading of the main pressure head center main pressure and the edge auxiliary pressure of the pressure ring, which improves the accuracy of pressure output and the speed of loading response.

[0032] The second hydraulic cylinder 107 in the cylinder groove 105 can precisely apply compensating pressure to the edge of the composite pressure-bearing cavity through the base plate 106 via the second pressure block 108. Corresponding to the confining pressure auxiliary loading component on the outline of the alloy sleeve assembly, it forms an arc transition at its corners and is thicker than the central area, thereby reducing the edge pressure attenuation, stabilizing and controlling the pressure difference throughout the composite pressure-bearing cavity, realizing isostatic pressure throughout the large-size cavity, providing a stable pressure field to improve the uniformity of diamond growth.

[0033] Under the control of the second hydraulic cylinder 107, the sliding of the second pressure block 108 is limited by the sliding action of the slider 109 and the slide groove 104. When placing the composite pressure-bearing cavity of the high-purity raw material packaging system 5, the second pressure block 108 around the first pressure block 103 is raised, so that the head surface of the first pressure block 103 and the end of the second pressure block 108 form a height difference. With the constraint component 4 set on the outer side of the alloy sleeve assembly, the first pressure transmission medium 401 is inserted into the groove formed by the height difference, so that the composite pressure-bearing cavity can be placed more stably and the operational stability can be improved.

[0034] The high-strength steel wire prestressed winding assembly is installed in the middle of the outer side of the sleeve 201 and the plug 202. For the steel wire prestressed winding assembly on the plug 202, the steel rope 209 is initially fixed to the ring hoop 205. By rotating its rotating disk 207, the steel rope 209 is tightened. For the steel wire prestressed winding assembly on the sleeve 201, initially only its horizontal steel rope 209 is connected to the rib hoop 204. Subsequently, through the encapsulation of the plug 202 and the sleeve 201, the ends of its vertical and diagonal steel ropes 209 are fixed to the ring hoop 205. Then, by tightening its rotating disk 207, the steel rope 209 is tightened. The steel rope 209 of the steel wire prestressed winding assembly provides pre-tightening constraint force at the edge of the alloy sleeve assembly, suppressing radial expansion and pressure relief at the edge of the composite pressure-bearing cavity under ultra-high pressure, thereby locking the edge pressure. With the help of the auxiliary loading assembly to thicken its edge, the local pressure-bearing capacity is further improved, and the pressure is prevented from decaying from the side wall of the cavity, thereby effectively controlling the pressure relief problem.

[0035] The alloy sleeve assembly features an improved cubic structure, which is more compatible with a six-sided symmetrical hydraulic pressurization structure. The six main pressure heads can completely fit the six faces of the alloy sleeve assembly, enabling more uniform axial and radial loading, higher space utilization, and facilitating the directional growth of large-sized block diamond blanks. The alloy sleeve assembly's contour is equipped with confining pressure auxiliary loading components, forming rounded transitions at the corners and thicker than the central area, thereby reducing stress concentration at the corners, offsetting the defects of edge pressure attenuation, and improving the adaptability of the alloy sleeve assembly.

[0036] Both the inner sides of the sleeve 201 and the plug 202 have arc grooves 203 in the middle. The central area of ​​the arc grooves 203 is concave outward, forming a cube-shaped outline inside the composite pressure-bearing cavity. When the composite pressure-bearing cavity is pressurized by the ultra-high pressure loading mechanism 1, stress concentration occurs in the edge area, automatically replenishing the edge pressure. At the same time, the outer side of the alloy sleeve assembly is provided with a corresponding constraint component 4 covering the prestressed steel wire winding assembly. The first pressure transmission medium 401 is embedded with nested ring steps 402. During the pressurization process, the six main pressure heads apply axial pressure to the composite pressure-bearing cavity through the constraint components 4. The first pressure transmission medium 401 will be compressed due to the pressure. The natural tendency for the pressure to diffuse towards the lower pressure edge is generated, and the added ring step 402 forms a physical barrier. The vertical surface of the ring step 402 can directly block the lateral flow of the first pressure transmitting medium 401, preventing it from leaking into the edge gap. At the same time, the ring step 402 is in close contact with the first pressure transmitting medium 401, and when subjected to force, it will generate a reverse clamping force on the first pressure transmitting medium 401, guiding the first pressure transmitting medium 401 to feed the pressure back to the center of the composite pressure bearing cavity, reducing pressure loss in the edge area, thereby achieving the effect of constraining the diffusion of the first pressure transmitting medium 401 and supplementing the edge load, further optimizing the pressure uniformity of the cubic alloy sleeve assembly.

[0037] The bushing assembly includes a cubic bushing 503 with a mold groove 504 adapted to the inner mold 501, forming a structure that is thick at the edges and thin at the center. Relying on the rigid pressure transmission characteristics of the metal bushing, the pressure attenuation at the side wall of the composite pressure-bearing cavity is blocked, achieving efficient and lossless transmission of ultra-high pressure loads. The thickened edge structure of the bushing 503 can directionally enhance the pressure transmission at the edge of the composite pressure-bearing cavity, allowing the load to penetrate evenly to the edge core growth area, accurately compensating for edge pressure attenuation, and further optimizing the pressure uniformity of the entire large-size cavity.

[0038] The bushing assembly is fitted between the inner mold assembly and the second cavity mechanism 3, and fits tightly with both the second cavity mechanism 3 and the inner mold assembly without gaps. This eliminates pressure transmission gaps on the side walls and prevents pressure leakage. It works in synergy with the design of the composite pressure-bearing cavity to ensure pressure balance in all aspects. The first bushing 505 of the bushing assembly fits into the first groove 305, and the second bushing 506 fits into the second groove 502. This effectively reduces defects such as diamond misalignment and improves the stability and yield of large-size, high-grade diamond synthesis.

[0039] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A large-size, high-grade synthetic diamond synthesis device, comprising a symmetrical ultra-high pressure loading mechanism (1), a composite pressure-bearing cavity, a temperature control system, a high-purity raw material packaging system (5), and a safety protection system; Its features are: The symmetrical ultra-high pressure loading mechanism (1) adopts a six-sided top symmetrical hydraulic pressurization structure, including a six-sided main pressure head and an edge auxiliary pressure ring; The six-sided main pressure head and the edge auxiliary pressure ring are a split structure. Each main pressure head and pressure ring is equipped with an independent servo hydraulic cylinder, forming a two-stage loading of the main pressure head center main pressure and the pressure ring edge auxiliary pressure. The main pressure head includes a first hydraulic cylinder (101), a base block (102) is fixedly connected to the end of the first hydraulic cylinder (101), and a first pressure block (103) is fixedly connected to the middle of the head surface of the base block (102); the tail side of the first pressure block (103) is uniformly provided with sliding grooves (104); the edge of the head surface of the base block (102) is uniformly provided with cylinder grooves (105) at equal intervals. The pressure ring includes a base plate (106) that is slidably sleeved with the first pressure block (103). The tail surface of the base plate (106) is uniformly fixed with a second hydraulic cylinder (107) embedded in the cylinder groove (105). The head surface of the base plate (106) is uniformly fixed with a centrally symmetrical second pressure block (108). The second pressure block (108) is arranged in a ring shape with the first pressure block (103). The outer side of the head of the second pressure block (108) is chamfered. The inner side of the tail of the second pressure block (108) is fixedly connected with a slider (109) corresponding to the sliding groove (104). The six-sided main pressure head is provided with a protective cover (110) for embedding the first hydraulic cylinder (101). The corners of the protective cover (110) are equipped with safety doors (111), and a base (112) is fixedly connected to the lower side of the protective cover (110). The composite pressure-bearing cavity includes an external first cavity mechanism (2) and an internal second cavity mechanism (3). The first cavity mechanism (2) includes an alloy sleeve assembly, a high-strength steel wire prestressed winding assembly, and a confining pressure auxiliary loading assembly; The alloy sleeve assembly is an improved cubic structure, and its outline is provided with a confining pressure auxiliary loading component; The second cavity mechanism (3) includes a six-sided alloy plate (301) with chamfered edges on the inner side of the alloy plate (301) forming a conical engagement; the corners of the second cavity mechanism (3) form triangular pyramidal notches.

2. The large-size, high-grade synthetic diamond synthesis device according to claim 1, characterized in that: The alloy sleeve assembly includes a side sleeve (201) and upper and lower plugs (202); the inner side surfaces of the sleeve (201) and the plugs (202) are both provided with arc grooves (203). The confining pressure auxiliary loading component includes a rib hoop (204) fixed to the four sides of the outer side of the sleeve (201) and a ring hoop (205) fixed to the outer edge of the plug (202).

3. The large-size, high-grade synthetic diamond synthesis device according to claim 2, characterized in that: High-strength steel wire prestressed winding assembly is provided on the middle of the outer side of both the sleeve (201) and the plug (202); The prestressed wire winding assembly includes a swivel seat (206) of a fixed alloy sleeve assembly. A rotating disk (207) is rotatably sleeved at the end of the swivel seat (206). A winding post (208) inserted into the swivel seat (206) is fixedly connected to the middle of the tail face of the rotating disk (207). Steel ropes (209) are fixedly connected at equal intervals on the winding post (208). The transverse steel rope (209) of the prestressed wire winding assembly on the sleeve (201) is initially fixed to the rib hoop (204), and the vertical and diagonal steel ropes (209) are subsequently fixed to the ring hoop (205). The steel rope (209) of the prestressed wire winding assembly on the plug (202) is initially fixed to the hoop (205).

4. The large-size, high-grade synthetic diamond synthesis device according to claim 3, characterized in that: The outer surface of each alloy sleeve assembly is provided with a corresponding constraint component (4) covering the prestressed wire winding assembly. The constraint component (4) includes a first pressure transmission medium (401) that is embedded in the prestressed wire winding assembly. The first pressure transmission medium (401) is embedded with nested ring steps (402).

5. The apparatus for synthesizing large-size, high-grade synthetic diamond according to claim 2, characterized in that: The outer side of the alloy plate (301) is fixedly embedded with a second pressure transmission medium (302) that is adapted to fit the fitting arc groove (203). The outer side of the tail of the second pressure transmission medium (302) is fixedly connected with oblique connecting strips (303) at equal intervals. The connecting strips (303) are embedded in the alloy plate (301) and extend into the notch. The notch is filled with a sealing block (304) to secure the connecting strip (303); The alloy plate (301) has a first groove (305) in the middle of its inner side surface.

6. The apparatus for synthesizing large-size, high-grade synthetic diamond according to claim 5, characterized in that: The composite pressure-bearing cavity is filled with a partitioned composite pressure-transmitting medium. The first pressure-transmitting medium (401) filled at the edge of the composite pressure-bearing cavity is a soft pressure-transmitting medium with high compressibility and high pressure-transmitting efficiency, while the second pressure-transmitting medium (302) filled at the center of the composite pressure-bearing cavity is a hard pressure-transmitting medium with low compressibility and high stability.

7. The large-size, high-grade synthetic diamond synthesis device according to claim 6, characterized in that: The high-purity raw material packaging system (5) is located in a composite pressure-bearing cavity, including a high-purity carbon source, catalyst, seed crystal orientation fixation and vacuum sealing inner mold assembly and a bushing assembly assembled together. The inner mold assembly includes a spherical inner mold (501), and each of the six sides of the inner mold (501) is provided with a second groove (502). The bushing assembly is adapted between the inner mold assembly and the second cavity mechanism (3), including a cubic bushing (503), and the bushing (503) has a mold groove (504) adapted to the inner mold (501). The bushing (503) has a bushing assembly embedded on all six sides. The bushing assembly includes a first bushing (505) with the outer side adapted to the first groove (305) and a second bushing (506) with the inner side adapted to the second groove (502).

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