A method for reducing the cost of manufacturing synthetic diamond single crystals

Abstract

The present application relates to the technical field of synthetic diamond monocrystal manufacturing, and discloses a method for reducing the cost of synthetic diamond monocrystal manufacturing, which combines the respective advantages of two-face top and six-face top presses for synthesizing monocrystals, simplifies the difficulty of synthesizing monocrystals, uses the same press, reduces the wall thickness of the cylinder, increases the cavity, and simultaneously increases the main cylinder pressure; the yield is naturally increased: the pressure power of the whole machine is increased, the size of the cylinder is increased, the cavity space is greatly expanded, and the yield efficiency is increased by several times; the quality is improved: after the lateral wall of the pressure cavity of the synthetic monocrystal is fully guaranteed, the main pressure of the synthetic monocrystal can be naturally improved and prolonged, and a more reliable, effective and greater guarantee is provided for the high-quality monocrystal synthesis process; the cost is reduced: the service life of the cylinder and the anvil is greatly increased, the expensive and complex composite and winding type cylinder is replaced, the cost of the cylinder is greatly reduced, and the damage of the anvil, the scrapping of the product and the reduction of the production capacity caused by the explosion of the cylinder are reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of synthetic diamond single crystal manufacturing, in particular to a method for reducing the manufacturing cost of synthetic diamond single crystal. BACKGROUND

[0002] Synthetic diamond abrasive is widely used in drilling, cutting and grinding tools, and plays an important role in many industries. In recent years, it has also been applied to the electronic, semiconductor, aerospace and other modern industries due to its excellent thermal conductivity. Currently, there are mainly two ways to synthesize diamond single crystal: cubic anvil press and two-sided anvil press. The so-called cubic anvil high temperature and high pressure device is an oil pressure driven six mutually perpendicular pistons moving towards the center simultaneously. The end of each piston is fixed with a hard alloy anvil. The axes of the six anvils are adjusted to coincide at a point, which is called the structural center of the device. The three straight lines formed by the three pairs of pistons intersect at a point in space, which is called the structural center of the device. The six anvils on the end of the piston should be precisely adjusted so that their axes should also intersect at a point in space, which is called the force center. The device works to achieve the coincidence of the above two centers. In addition, for the synthesis block, there is a mass center. An ideal working state requires the above three centers to be combined. The oil pressure drives six mutually perpendicular pistons to move towards the center simultaneously. The end of each piston is fixed with a hard alloy anvil. The six-sided anvil press for synthesizing diamond single crystal is a device that uses high temperature and high pressure technology to make carbon source and metal catalyst react for a long time to form diamond. The process is to apply uniform six-sided force to the carbon source under high temperature and high pressure, so that carbon atoms gradually crystallize to form diamond. The two-sided anvil press includes a static pressure cylinder composed of single super-thick and multi-layer materials, a hard alloy anvil and other parts. The upper and lower beam structures are made of steel plates welded together. The upper beam is used to install the hydraulic cylinder and is fixed by flange and bolt connection. The lower beam is used to place the two-sided anvil mold device, and the bottom is fixed to the ground by a support plate. The piston rod head end of the pressure cylinder is installed with a pressure hammer, and a pressure hammer is also fixed on the workbench. The piston rod acts on the upper pressure hammer to make it move down. In addition, the press workbench is equipped with auxiliary devices to fix and guide the mold. During operation, the pressure hammers apply pressure to the synthesis cavity from the upper and lower directions respectively. The radial flow of the pressure medium in the cavity is limited by the mold, thereby forming a super-high pressure condition. The principle of two-sided press mainly depends on its two-way pressing basic structure and the pressure provided by the hydraulic source. Through the cooperation of piston, cylinder and other components, as well as the precise control of hard alloy anvil and pressure cylinder space, efficient compression of the material is realized. The press equipment is simple, the pressure source has good general performance, the volume of the high-pressure cavity is large, it is suitable for growing high-quality coarse-grained single crystal diamond, and it is easy to realize the large-scale of the equipment. With the same size of high-pressure cavity, the diamond single yield of two-sided anvil press is 1.5-2 times that of cubic anvil press, and the quality is better than that of cubic anvil press.

[0003] Although the cost of single crystal manufactured by the cubic press is much lower than that of the two-sided press, the quality of the single crystal manufactured by the cubic press is much lower than that of the two-sided press, and the conversion rate of the single crystal is much lower than that of the two-sided press. The bottleneck of the cubic press has already appeared. The hydraulic cylinder diameter of the existing 6x60MN cubic press is 1000mm, the weight of the whole machine is as high as 300 tons, and the height is more than 7 meters. If it continues to be large, the weight and volume will be more massive. Manufacturing, installation, transportation, operation and maintenance will be more difficult, and the manufacturing and use costs will also increase. The reason why the two-sided press manufacturing single crystal route has not been widely popularized is that the expensive hard alloy high-pressure cylinder and hard alloy top hammer consumables are in a long-term high consumption state, resulting in high cost of two-sided press manufacturing single crystal.

[0004] Although the existing cubic manufacturing technology consumes less material and has low production cost, the quality of the single crystal manufactured by the cubic press is poor, and the single output of the single crystal from the same cavity is much lower than that of the two-sided press. Especially the equipment is heavy and large, and the space for further development has reached the ceiling. Although the two-sided manufacturing technology is superior to the cubic manufacturing in many ways, the high manufacturing cost seriously restricts the development of the two-sided press manufacturing. SUMMARY

[0005] The purpose of the present application is to provide a method for reducing the cost of manufacturing single crystal of synthetic diamond. The present application combines the advantages of two-sided and cubic presses for synthesizing single crystals, simplifies the difficulty of synthesizing single crystals, and through reliable, durable and convenient cylinder protection design, the synthesis of single crystals is no longer as cumbersome as the cubic process, and there is no high manufacturing threshold and high cost of two-sided process. The difficulty of synthesizing single crystals is greatly reduced. The production capacity is improved: the synthesis cavity is no longer restricted by the traditional cubic press which is difficult to be large-scale, and the two-sided press cylinder which is difficult to be popularized. The synthesis cavity can be enlarged by several times, and the production capacity can be improved by tens of times. The efficiency is improved: the same press, the cylinder wall thickness is reduced, the cavity is increased, and the main cylinder pressure can be increased. The single output is naturally improved: the whole machine pressure power is improved, the cylinder size is increased, and the cavity space is greatly expanded, and the single output efficiency is increased by several times. The quality is improved: after the synthesis of single crystal pressure cavity is fully protected by the side wall, the main pressure of the synthesized single crystal can be improved and prolonged, which provides more reliable, effective and larger guarantee for the synthesis process of high-quality single crystal. The service life of the cylinder and the top hammer is greatly improved, the number of times of using the cylinder under the clamping block is greatly improved, the expensive and complex composite and winding type cylinder is replaced, the cost of the cylinder is greatly reduced, and the damage of the top hammer caused by the cylinder burst, the scrap of the product and the reduction of the production capacity are reduced. The problems in the above background technology are solved.

[0006] To achieve the above purpose, the present application provides the following technical scheme: a method for reducing the cost of manufacturing single crystal of synthetic diamond, comprising the following steps:

[0007] Step S1: Ensure that the several symmetrical center of the hug ring and the hug clamp block are consistent with the symmetrical center of the upper and lower main cylinder;

[0008] Step S2: Open the four surrounding high-pressure oil cylinder, under the action of the oil pressure of the surrounding high-pressure oil cylinder, the several hug clamp blocks and the hard alloy pressure cylinder at the end of the hug clamp block which are evenly distributed around the synthetic single crystal module move to the center at the same time, and the hug clamp block is tightly clamped by the high-pressure oil cylinder around the periphery.

[0009] Step S3: Open the upper end high-pressure oil cylinder to make the upper hard alloy top hammer translate downward, cooperate with the lower hard alloy top hammer fixed on the workbench, and apply pressure to the synthetic cavity from the upper and lower directions respectively, the two hard alloy top hammers and the hard alloy inner ring cylinder cavity tightly clamped by the several surrounding hug clamp blocks cooperate, and the horizontal, vertical and radial flow of the inner transmission medium is limited by the mold, so as to form an ultra-high pressure condition.

[0010] Step S4: After the completion of the synthetic single crystal, open the upper end high-pressure oil cylinder to make the upper hard alloy top hammer translate upward.

[0011] Step S5: Open the four surrounding high-pressure oil cylinder, under the action of the oil pressure of the surrounding high-pressure oil cylinder, the several hug clamp blocks and the hard alloy pressure cylinder at the end of the hug clamp block which are evenly distributed around the synthetic single crystal module move to the periphery at the same time, and the synthetic single crystal module is taken out.

[0012] Preferably, the hug clamp block and the hard alloy pressure cylinder at the end of the hug clamp block have two, the high-pressure oil cylinder around the hug clamp block has two, and the hard alloy pressure cylinder is a complete inner pressure cylinder ring divided into two.

[0013] Preferably, the hug clamp block and the hard alloy pressure cylinder at the end of the hug clamp block have three, the high-pressure oil cylinder around the hug clamp block has three, and the hard alloy pressure cylinder is a complete inner pressure cylinder ring divided into three.

[0014] Preferably, the hug clamp block and the hard alloy pressure cylinder at the end of the hug clamp block have four, the high-pressure oil cylinder around the hug clamp block has four, and the hard alloy pressure cylinder is a complete inner pressure cylinder ring divided into four.

[0015] Preferably, the hug clamp block is made of tungsten-cobalt alloy or ceramic material.

[0016] Preferably, the hug clamp block is made of tungsten-nickel alloy.

[0017] Preferably, the hug clamp block is made of silicon carbide.

[0018] Preferably, the embracing clamp block is made of silicon nitride.

[0019] Preferably, the embracing clamp block and the hard alloy anvil surface are both installed with leaf talc.

[0020] Preferably, the middle part of the synthetic single crystal module is installed with a conductive ring.

[0021] Compared with the prior art, the present application has the following beneficial effects:

[0022] 1. Simplify the difficulty of synthetic single crystal: the present application combines the respective advantages of the two-sided anvil and the six-sided anvil single crystal synthesis press to simplify the difficulty of synthetic single crystal, and through reliable, durable and convenient cylinder protection design, the single crystal synthesis is no longer as cumbersome as the six-sided anvil process, and there is no high manufacturing threshold and high cost of two-sided anvil process, so the difficulty of synthetic single crystal is greatly reduced.

[0023] 2. Improve productivity: the synthetic cavity of the present application is no longer subject to the constraints of the traditional six-sided anvil, which is difficult to be large, and the two-sided anvil cylinder, which is difficult to be popularized, so the synthetic cavity can be enlarged by several times, and the productivity is improved by several tens of times.

[0024] 3. Improve efficiency: with the same press, reduce the wall thickness of the cylinder, increase the cavity, and at the same time, increase the main cylinder pressure; naturally increase the yield: increase the pressure power of the whole machine, increase the size of the cylinder, greatly expand the cavity space, and increase the yield efficiency by several times.

[0025] 4. Improve quality: after the synthetic single crystal pressure cavity is fully protected by the side wall reinforcement, the main pressure of the synthetic single crystal can be naturally improved and prolonged, which provides more reliable, effective and greater guarantee for the high-quality single crystal synthesis process.

[0026] 5. Reduce cost: the service life of the cylinder and the anvil is greatly improved, the number of times the cylinder is used under the clamping of the clamp block is greatly improved, the expensive and complex composite and winding type cylinder is replaced, the cost of the cylinder is greatly reduced, and the damage of the anvil caused by the explosion of the cylinder, the scrap of the product and the reduction of the productivity are reduced. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is the front view of the present application;

[0028] Figure 2 is the top view of the double-hydraulic-cylinder opposed top symmetrical embracing clamp block of the present application;

[0029] Figure 3 is the top view of the three-hydraulic-cylinder opposed top three-equal-part embracing clamp block of the present application;

[0030] Figure 4 is the top view of the four-hydraulic-cylinder opposed top four-equal-part embracing clamp block of the present application.

[0031] Figure: 1, high-pressure piston; 2, clamping block; 3, hard alloy pressure cylinder; 4, hard alloy top hammer; 5, alloy single crystal module; 6, conductive ring; 7, talc. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only 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 skilled in the art without creative work fall within the scope of protection of the present application.

[0033] Embodiment one:

[0034] Please refer to Figure 1 and Figure 2 , a method for reducing the cost of manufacturing synthetic diamond single crystal, comprising the following steps:

[0035] Step S1: Ensure that the symmetrical centers of the plurality of clamping blocks divided by the clamping ring are coincident with the symmetrical centers of the upper and lower main pressure cylinders;

[0036] Step S2: Start the four surrounding high-pressure oil cylinders. Under the action of the oil pressure of the surrounding high-pressure oil cylinders, the plurality of clamping blocks uniformly distributed around the periphery of the synthetic single crystal module and the hard alloy pressure cylinders at the ends of the clamping blocks simultaneously move towards the center through the transmission of the high-pressure piston. The clamping blocks are tightly clamped by the high-pressure oil cylinders around the periphery, so that the hard alloy inner ring pressure cylinder is tightly clamped by the clamping blocks;

[0037] Step S3: Start the upper high-pressure oil cylinder to make the upper hard alloy top hammer translate downward. The upper and lower hard alloy top hammers cooperate to apply pressure to the synthetic cavity from the upper and lower directions, respectively. The two hard alloy top hammers cooperate with the hard alloy inner ring pressure cylinder cavity tightly clamped by the plurality of surrounding clamping blocks. The transverse, longitudinal and radial flow of the pressure medium is limited by the mold, thereby forming an ultra-high pressure condition;

[0038] Step S4: After the synthetic single crystal is completed, start the upper high-pressure oil cylinder to make the upper hard alloy top hammer translate upward;

[0039] Step S5: Start the four surrounding high-pressure oil cylinders. Under the action of the oil pressure of the surrounding high-pressure oil cylinders, the plurality of clamping blocks uniformly distributed around the periphery of the synthetic single crystal module and the hard alloy pressure cylinders at the ends of the clamping blocks simultaneously move towards the periphery, and the synthetic single crystal module is discharged. The single crystal is taken out.

[0040] By combining the respective advantages of the two-sided top and the six-sided top press to synthesize single crystals, the difficulty of synthesizing single crystals is simplified. Through reliable, durable and convenient cylinder protection design, the synthesis of single crystals is no longer as cumbersome as the six-sided top process, and there is no high manufacturing threshold and high cost of two-sided top process. The difficulty of synthesizing single crystals is greatly reduced; improve productivity: the synthesis cavity is no longer subject to the constraints of traditional six-sided top, and the two-sided top cylinder is difficult to popularize. The synthesis cavity can be enlarged by several times, and the productivity can be improved by tens of times; improve efficiency: reduce the wall thickness of the cylinder, increase the cavity, and at the same time increase the main cylinder pressure; natural increase in yield: increase the pressure power of the whole machine, increase the size of the cylinder, greatly expand the cavity space, and increase the yield efficiency by several times; improve quality: after the synthesis of single crystal pressure cavity is fully protected by side reinforcement, the main pressure of single crystal synthesis can be improved and prolonged, providing more reliable, effective and greater guarantee for high-quality single crystal synthesis process; reduce cost: the service life of the cylinder and the anvil is greatly improved, the number of times the cylinder is used under the clamping block is greatly improved, replacing the expensive and complex composite and winding cylinder, greatly reducing the cost of the cylinder, and reducing the damage to the anvil caused by the cylinder explosion, product scrap and reduced production capacity.

[0041] Further, the two hard alloy cylinders 3 of the clamping block 2 and the end of the clamping block 2 are evenly distributed around the high-pressure oil cylinder, and the hard alloy cylinder 3 is a complete inner pressure cylinder ring divided into two equal parts.

[0042] Example two:

[0043] Please refer to Figure 1 and Figure 3 , a method for reducing the cost of manufacturing synthetic diamond single crystals is shown in the figure, comprising the following steps:

[0044] Step S1: Ensure that the symmetrical center of the clamping ring divided into several clamping blocks coincides with the symmetrical center of the upper and lower main cylinders;

[0045] Step S2: Start the four surrounding high-pressure oil cylinders. Under the push of the oil pressure of the surrounding high-pressure oil cylinder, through the transmission of the high-pressure piston, the several clamping blocks and the hard alloy cylinders at the end of the clamping blocks evenly distributed around the synthesis single crystal module move towards the center at the same time, and the clamping blocks are tightly clamped by the hard alloy inner ring cylinder through the clamping of the surrounding high-pressure oil cylinder;

[0046] Step S3: Start the upper high-pressure oil cylinder to make the upper hard alloy anvil translate downward, cooperate with the lower hard alloy anvil fixed on the workbench, and apply pressure to the synthesis cavity from the upper and lower directions respectively. The two hard alloy anvils and the hard alloy inner ring cylinder cavity tightly clamped by the several surrounding clamping blocks cooperate, and the horizontal, vertical and radial flow of the inner pressure medium is limited by the mold, thereby forming an ultra-high pressure condition;

[0047] Step S4: After the completion of the synthesis of single crystal, the upper end of the high-pressure oil cylinder is opened to make the upper hard alloy top hammer translate upward;

[0048] Step S5: The four surrounding high-pressure oil cylinders are opened, and under the action of the oil pressure of the surrounding high-pressure oil cylinders, the several clamping blocks uniformly distributed around the hard alloy pressure cylinder at the end of the clamping block and the hard alloy pressure cylinder at the end of the clamping block move outward at the same time, the synthesized single crystal module is leaked out, and the single crystal is taken out.

[0049] By combining the respective advantages of the two-sided top and the six-sided top press for synthesizing single crystals, the difficulty of synthesizing single crystals is simplified, and through reliable, durable and convenient cylinder protection design, the synthesis of single crystals is no longer as cumbersome as the six-sided top process, and there is no high manufacturing threshold and high cost of the two-sided top process. The difficulty of synthesizing single crystals is greatly reduced; improve productivity: the synthesis cavity is no longer subject to the constraints of the traditional six-sided top, which is difficult to be large, and the current situation of the two-sided top cylinder, which is difficult to popularize and popularize. The synthesis cavity can be enlarged by several times, and the productivity is increased by tens of times; improve efficiency: reduce the thickness of the cylinder wall of the same press, increase the cavity, and increase the main cylinder pressure; natural increase in yield: increase the pressure power of the whole machine, increase the size of the cylinder, and greatly expand the cavity space, which increases the yield efficiency by several times; improve quality: after the synthesis of single crystal pressure cavity is fully protected by the side wall, the main pressure of the synthesized single crystal can be naturally improved and prolonged, which provides more reliable, effective and larger guarantee for the synthesis process of high-quality single crystal; reduce cost: the service life of the cylinder and the hammer is greatly improved, the number of times of using the cylinder under the clamping of the clamping block is greatly improved, the expensive and complex composite and winding type cylinder is replaced, the cost of the cylinder is greatly reduced, and the damage of the hammer caused by the explosion of the cylinder, the scrap of the product and the reduction of the productivity are reduced.

[0050] Further, the hard alloy pressure cylinder 3 at the end of the clamping block 2 has three, the surrounding high-pressure oil cylinder uniformly distributed around the clamping block 2 has three, and the hard alloy pressure cylinder 3 is a complete internal pressure cylinder ring divided into three equal parts.

[0051] Example three:

[0052] Please refer to Figure 1 and Figure 4 , a method for reducing the manufacturing cost of synthetic diamond single crystal, comprising the following steps:

[0053] Step S1: Ensure that the symmetrical center of the several clamping blocks equally divided by the clamping ring coincides with the symmetrical center of the upper and lower main cylinders;

[0054] Step S2: open the four surrounding high-pressure oil cylinders, under the action of the oil pressure of the surrounding high-pressure oil cylinder, the several clamping blocks evenly distributed around the synthetic single crystal module and the hard alloy pressure cylinder at the end of the clamping block move outward at the same time, and the synthetic single crystal module is discharged, and the single crystal is taken out.

[0055] Step S3: open the upper end high-pressure oil cylinder to make the upper hard alloy top hammer translate downward, cooperate with the lower hard alloy top hammer fixed on the workbench, and apply pressure to the synthetic cavity from the upper and lower directions respectively, the two hard alloy top hammers are tightly clamped with the hard alloy inner ring pressure cylinder cavity surrounded by several clamping blocks, and the transverse, longitudinal and radial flow of the inner pressure medium is limited by the mold, so that the superhigh pressure condition is formed.

[0056] Step S4: after waiting for the completion of the synthetic single crystal, open the upper end high-pressure oil cylinder to make the upper hard alloy top hammer translate upward.

[0057] Step S5: open the four surrounding high-pressure oil cylinders, under the action of the oil pressure of the surrounding high-pressure oil cylinder, the several clamping blocks evenly distributed around the synthetic single crystal module and the hard alloy pressure cylinder at the end of the clamping block move outward at the same time, and the synthetic single crystal module is discharged, and the single crystal is taken out.

[0058] By combining the respective advantages of the two-sided top and the six-sided top single crystal synthesis press, the difficulty of synthetic single crystal synthesis is simplified, and through reliable, durable and convenient cylinder protection design, the synthetic single crystal synthesis is no longer as complicated as the six-sided top process, and there is no high manufacturing threshold and high cost of two-sided top process, so that the difficulty of synthetic single crystal synthesis is greatly reduced; improve the capacity: the synthetic cavity is no longer restricted by the traditional six-sided top which is difficult to be large, and the two-sided top cylinder which is difficult to be popularized, so that the synthetic cavity can be enlarged by several times, and the capacity can be improved by tens of times; improve the efficiency: with the same press, reduce the thickness of the cylinder wall, increase the cavity, and at the same time, increase the main cylinder pressure; natural yield increase: increase the pressure power of the whole machine, increase the size of the cylinder, greatly expand the cavity space, and increase the yield efficiency by several times; improve the quality: after the synthetic single crystal pressure cavity is fully protected by the side reinforcement, the main pressure of the synthetic single crystal can be naturally improved and prolonged, which provides more reliable, effective and larger guarantee for the high-quality single crystal synthesis process; reduce the cost: the service life of the cylinder and the top hammer is greatly improved, the use frequency of the cylinder under the clamping of the clamping block is greatly improved, the expensive and complex composite and winding type cylinder is replaced, the cost of the cylinder is greatly reduced, and the damage of the top hammer caused by the explosion of the cylinder, the scrap of the product and the reduction of the capacity are reduced.

[0059] Further, the hard alloy pressure cylinder 3 at the end of the clamping block 2 has four, the clamping block 2 is evenly distributed around the high-pressure oil cylinder, and the hard alloy pressure cylinder 3 is a complete inner pressure cylinder ring divided into four equal parts.

[0060] It should be noted that the present application also includes hydraulic systems, cooling systems, control systems.

[0061] The working principle of the present application is to take the advantages of both two-sided top and six-sided top press machine technology routes, mainly based on the process route of two-sided top press machine for single crystal manufacturing, and change the static pressure cylinder composed of single super-thick and multi-layer materials into a structure composed of a thinned inner pressure cylinder ring and 2-4 high-pressure oil cylinders connected to the corresponding number of 2-4 clamping blocks of the tight circular ring, so as to form a sufficient protection for the hard alloy inner ring pressure cylinder under the action of ultra-high radial pressure, keep the inner pressure cylinder ring from being extruded and cracked, and effectively assist the upper and lower hard alloy top hammers to exert ultra-high pressure on the workpiece, thus successfully completing the synthesis of single crystal. On the basis of the single crystal manufacturing technology of two-sided top press machine, the main high-pressure process of the upper and lower high-pressure oil cylinders is kept unchanged, and the static clamping structure of the hard alloy composite pressure cylinder is changed to a structure of 2-4 movable circular arc clamping blocks clamping the thinned hard alloy pressure cylinder inner ring, and the clamping blocks are connected to the pistons of the high-pressure oil cylinders. Under the action of the high-pressure oil cylinders, the circular arc clamping blocks tightly clamp the hard alloy inner ring pressure cylinder. Through the clamping blocks held by the peripheral hydraulic cylinders, the inner ring of the pressure cylinder is tightly clamped, which can greatly reduce the thickness of the inner ring of the pressure cylinder. The thickness of the thinned hard alloy pressure cylinder inner ring is only 1 / 5-1 / 3 of the thickness of the original composite and wound pressure cylinder, which is conducive to the large-scale development of the equipment. The circular clamping blocks can be made of tungsten-cobalt, tungsten-nickel alloy (such as YG3-YG10, YN3-YN10), silicon carbide, silicon nitride, etc. The number of clamping blocks is 2, 3 or 4, which are respectively connected to the upper bases of the two pairs of symmetrical, three-equal and four-equal oil cylinder pistons around the pressure cylinder ring. The oil cylinder pistons drive the clamping blocks to tightly clamp or loosen the pressure cylinder ring. The centers of all the clamping rings are symmetrical with the centers of the upper and lower main pressure cylinders. The surfaces of the clamping blocks and the hard alloy top hammers are both installed with leaf talc. Leaf talc has stable chemical properties and does not react with strong acid and strong base. It has good heat resistance and insulation, and is a sealing pressure transmission medium material that can assist in sealing the four sides of the single crystal synthesis module. The middle of the single crystal synthesis module is installed with a conductive ring. The main function of the conductive ring is to provide the necessary current to maintain the synthesis reaction. Specifically, the conductive ring has the following functions: heating: under high temperature and high pressure conditions, the current passing through the conductive ring can generate heat, helping to maintain the high temperature environment required for synthesis; assisting reaction: by providing current, the conductive ring can promote appropriate chemical reactions, enabling carbon atoms to effectively deposit and recombine to form a diamond structure; improving synthesis efficiency: the conductive ring can optimize the distribution and use of energy, thereby improving the efficiency of the synthesis process and saving energy consumption; controlling the quality of finished products: by precisely controlling the current and temperature, the roughness, particle size and crystal quality of synthetic diamonds can be affected, thereby improving the overall quality of the finished products.

[0062] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting; it is not intended to exclude myriad other embodiments of the present application that other inventors can develop based on the same general inventive concepts embodied by the described embodiments. That is, although the present application is described in terms of particular embodiments and illustrative figures, it should be apparent that the application can be varied in a multitude of ways. Such alterations, many of which will be apparent to those skilled in the art, can be based on current technology, and it is intended that the present application encompass any or all such alterations.

[0063] While the embodiments of the application have been shown and described herein, it will be understood by those skilled in the art that many changes, modifications, substitutions and alterations to these embodiments can be made without departing from the principles and spirits of the application, which is defined by the appended claims and their equivalents.

Claims

1. A method of reducing the cost of manufacturing a synthetic diamond single crystal, characterized by, It comprises the following steps: Step S1, ensure that the several clamping blocks of the clamping ring are symmetrically divided and the symmetrical center of the clamping blocks is consistent with the symmetrical center of the upper and lower main cylinders; Step S2, open the four surrounding high-pressure oil cylinders, under the action of the oil pressure of the surrounding high-pressure oil cylinders, through high-pressure piston transmission, the several clamping blocks uniformly distributed around the synthetic single crystal module and the hard alloy pressure cylinder at the end of the clamping blocks move to the center at the same time, and the clamping blocks are tightly clamped by the hard alloy inner ring pressure cylinder through the clamping of the surrounding high-pressure oil cylinders; Step S3, open the upper end high-pressure oil cylinder to make the upper hard alloy top hammer translate downward, cooperate with the lower hard alloy top hammer fixed on the workbench, and apply pressure to the synthetic cavity from the upper and lower directions respectively, the two hard alloy top hammers are tightly clamped with the hard alloy inner ring pressure cylinder cavity surrounded by the several clamping blocks, the transverse, longitudinal and radial flow of the inner transmission medium is limited by the mold, so as to form the superhigh pressure condition; Step S4, after the completion of the synthetic single crystal, open the upper end high-pressure oil cylinder to make the upper hard alloy top hammer translate upward; Step S5, open the four surrounding high-pressure oil cylinders, under the action of the oil pressure of the surrounding high-pressure oil cylinders, the several clamping blocks uniformly distributed around the synthetic single crystal module and the hard alloy pressure cylinder at the end of the clamping blocks move to the periphery at the same time, and the synthetic single crystal module is discharged, and the single crystal is taken out; It also comprises a hydraulic system, a cooling system and a control system. The method takes the advantages of the two-sided top and six-sided top press machine technology routes, and mainly uses the two-sided top press machine manufacturing single crystal process route. The static pressing cylinder composed of a single super-thick and multi-layer material is changed to a structure composed of a thinned inner pressing cylinder ring and 2-4 high-pressure oil cylinders connected to the corresponding number of 2-4 clamping blocks of the clamping ring, thereby forming a sufficient protection for the hard alloy inner ring pressing cylinder under the action of ultra-high radial pressure, keeping the inner pressing cylinder ring from being extruded and cracked, effectively assisting the upper and lower hard alloy top hammers to exert ultra-high pressure on the workpiece to successfully complete the synthesis of single crystal. On the basis of the single crystal manufacturing technology of the two-sided top press machine, the main high-pressure process mode of the upper and lower high-pressure oil cylinders is kept unchanged, and the static clamping structure of the hard alloy composite pressing cylinder is changed to a structure of 2-4 movable arc clamping blocks clamping the thinned hard alloy inner ring pressing cylinder. The clamping blocks are connected to the pistons of the high-pressure oil cylinders, and under the action of the high-pressure oil cylinders, the arc clamping blocks tightly clamp the hard alloy inner ring pressing cylinder. Through the clamping blocks clamped by the peripheral hydraulic cylinders, the thickness of the inner ring of the pressing cylinder can be greatly reduced. The thickness of the thinned hard alloy inner ring of the pressing cylinder is only 1 / 5-1 / 3 of the thickness of the original composite and winding type pressing cylinder, which is beneficial to the development of large-scale equipment. The circular clamping block is made of one of tungsten-cobalt, tungsten-nickel alloy, silicon carbide, and silicon nitride ceramic materials. The number of clamping blocks is 2, 3 or 4, which are respectively connected to the upper bases of the two pairs of symmetrical, three-equal and four-equal oil cylinder pistons around the horizontal pressing cylinder ring. The oil cylinder pistons drive the clamping blocks to tightly clamp and loosen the pressing cylinder ring. The centers of all the clamping rings are symmetrical with the centers of the upper and lower main pressing cylinders. The surfaces of the clamping blocks and the hard alloy top hammers are both installed with leaf talc. Leaf talc has stable chemical properties, generally does not react with strong acid and strong base, has good heat resistance and insulation, and is a sealing pressure transmission medium material that can assist in sealing the four sides of the single crystal synthesis module. The middle of the single crystal synthesis module is installed with a conductive ring to provide the necessary current to maintain the progress of the synthesis reaction.

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