High-stability diamond synthesis block of cavity with diameter of more than 70
By combining seals made of South African natural cerite and double-section cerite blocks in artificial diamond synthesis, combined with the composite structure of dolomite tubes and graphite wafers, the high-pressure leakage problem caused by the increase in cavity size is solved, and the high-pressure leakage problem is improved. Production stability and reduce costs, providing technical support for the popularization of large six-sided top presses.
Patent Information
- Application Number
- CN202411380595.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-30
- Publication Date
- 2024-12-13
AI Technical Summary
During the high-temperature and high-pressure synthesis of artificial diamonds, as the cavity size increases, the probability of pressure relief and "bubble" is increased, resulting in the intensification of the loss of the hexagonal top pressure set, high production costs, and poor sealing performance, which affects the synthesis stability.
Using seals made of South African natural cerite and double-section cerite blocks, combined with dolomite tubes and graphite wafers, the composite structure and segmentation joints are designed to improve sealing performance, reduce the probability of high-pressure leakage, and pass through plug assembly and convex ring Enhance the sealing effect.
It significantly reduces the probability of high-pressure leakage during synthesis of artificial diamonds in cavity above 70mm, improves production stability, reduces production costs, and provides technical support for the popularization of large six-sided top presses.
Smart Images
Figure CN119113920A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of artificial diamonds, in particular to a high-stability diamond synthetic block with a cavity having a diameter of more than 70 mm. Background Art
[0002] The commonly used synthesis process for artificial diamonds is the high temperature and high pressure method, and the high temperature and high pressure equipment commonly used is the six-sided top press. At present, the development direction of the six-sided top press is large-scale, with the six-sided top press with a cylinder diameter of φ900 and above as the main research direction. The size of the synthesis chamber on the six-sided top press has also increased accordingly, in the hope of synthesizing artificial diamonds of larger sizes. The current synthesis chamber size has reached the range of φ65mm~φ88mm, and is still increasing. The artificial diamonds produced by a single synthesis chamber have increased from 500 carats / piece to 900 carats / piece, and are still increasing. In the production process, the increase in the size of the synthesis chamber makes the probability of pressure relief and "bubble" suddenly increase. In addition, the leakage pressure generated by each "bubble" release reaches more than 60Mpa, which will cause the top hammer loss of the six-sided top press to increase sharply, aggravate the replacement frequency of the top hammer of the six-sided top press, and increase the production cost. Therefore, the production stability of synthetic diamonds synthesized in cavities above φ70mm is poor and the production cost is high. Summary of the invention
[0003] The purpose of the present invention is to solve the above problems and provide a high-stability diamond synthesis block with a cavity with a diameter of more than 70 mm. According to the inventor's research, as the size of the synthesis cavity increases, the overall size of the synthesis block used will also increase; the conventional synthesis block structure includes a double-section pyrophyllite block, a plug assembly, an insulating cup and a heating belt; the double-section pyrophyllite block is a sleeve-shaped block as a whole, and the plug assembly is arranged at the upper and lower ends of the double-section pyrophyllite block as a whole; the insulating cup is set inside the double-section pyrophyllite block; the heating belt is arranged between the insulating cup and the double-section pyrophyllite block; the graphite column used to generate artificial diamond is filled inside the insulating cup. The plug assembly supplies power to the graphite column, applies pressure, and seals it. Because the pyrophyllite material used in the original double-section pyrophyllite block partially undergoes phase change during the high-temperature and high-pressure synthesis process, the rheological properties of the pyrophyllite are deteriorated, and the resilience is insufficient, resulting in poor sealing performance of the eight sealing angles in the heating direction of the double-section pyrophyllite block, and the gas generated during the synthesis process rushes out from one or more sealing angle positions during the pressure relief process, causing the high-pressure "gas cannon" phenomenon.
[0004] The technical scheme of the present invention is: a high-stability diamond synthetic block with a cavity having a diameter of more than 70 mm, which is a cubic block as a whole, and comprises a double-section pyrophyllite block of a rectangular box body, a plug assembly, an annular heating belt, an insulating cup, a graphite column, and a sealing member made of South African natural pyrophyllite; the graphite column is filled in the insulating cup; the heating belt is sleeved outside the insulating cup; the double-section pyrophyllite block is sleeved outside the insulating cup; the plug assembly is installed at the upper and lower ends of the double-section pyrophyllite block; the sealing member is buckled at the upper and lower ends of the double-section pyrophyllite block; the South African natural pyrophyllite is mainly pyrophyllite, followed by kaolinite, and has the characteristics of "high aluminum and low silicon", SiO 2 The content is 58.05%, Al 2 O 3 The content is 31.46%, with a flaky metamorphic structure and high crystallinity; therefore, the seal made of natural pyrophyllite from South Africa has small volume shrinkage at high temperature and excellent rheological properties; when in use, the seal cooperates with ordinary pyrophyllite to provide sealing for the diamond synthesis block, which can greatly reduce the probability of pressure relief high-pressure leakage when synthesizing artificial diamonds in cavities above 70mm, ensure the stability of diamond production, reduce production costs, and play a certain role in promoting the popularization of six-sided top presses with a cylinder diameter of Ø900 or above; a plug hole matching the plug assembly is provided in the center of the seal; the plug assembly is inserted in the plug hole; the plug assembly supplies power to the graphite column and applies pressure.
[0005] Preferably, the high-stability diamond synthetic block with a cavity with a diameter of more than 70 mm also includes a dolomite tube; an embedding groove matching the dolomite tube is provided inside the double-section pyrophyllite block; the dolomite tube is embedded in the embedding groove to form a whole with the double-section pyrophyllite block; the double-section pyrophyllite block and the dolomite tube are a composite structure, the inner diameter of the dolomite tube is consistent with the inner hole size of the double-section pyrophyllite block, and the edge of the dolomite tube is 3-8 mm away from the edge of the double-section pyrophyllite block; the double-section pyrophyllite block and the dolomite tube cooperate with each other to transmit pressure to the graphite column; a horizontal dividing seam is provided in the middle of the double-section pyrophyllite block, which divides the double-section pyrophyllite block into two parts that are buckled together in an upper and lower manner to facilitate the assembly of the diamond synthetic block; the double-section pyrophyllite block is a double-section structure that can be separated from top to bottom.
[0006] Preferably, the high-stability diamond synthetic block with a cavity having a diameter of more than 70 mm further comprises a graphite disc; the circumference of the graphite disc is connected to the inner wall of the double-section pyrophyllite block; there are two graphite discs, which are symmetrically arranged at the upper and lower ends of the insulating cup.
[0007] Preferably, a dividing seam B is provided in the middle of the insulating cup; a dividing seam C is provided in the middle of the iron cup; dividing seam B divides the porcelain cup into two parts, an upper part and an lower part; dividing seam C divides the iron cup into two parts, an upper part and an lower part. This makes it convenient to put the graphite column into the insulating cup.
[0008] Furthermore, the dividing seams A, B and C are on the same horizontal plane, which can reduce the difficulty of assembling the diamond synthetic block.
[0009] Preferably, a convex ring is provided on the inner side of the seal; the outer wall of the convex ring is connected to the inner hole of the double-section pyrophyllite block; the inner wall of the convex ring corresponds to the plug hole; the convex ring cooperates with the plug hole to increase the sealing performance during the synthesis of the diamond synthetic block.
[0010] Furthermore, the plug assembly includes a plug, a pressure-piercing medium, and a talc ring; the plug includes a connected disc and a central axis; the pressure-piercing medium and the talc ring have inner walls connected to the central axis and outer walls connected to the plug hole; the pressure-piercing medium abuts against the disc; the talc ring abuts against the pressure-piercing medium.
[0011] Furthermore, a sinking groove matching the disc is provided at the outer end of the plug hole; the disc is embedded in the sinking groove to reduce the height difference between the end face of the disc and the end face of the seal, which is beneficial to the transmission of pressure.
[0012] Furthermore, the end face of the central shaft, the end face of the pyrophyllite ring, and the inner end face of the seal are flush to evenly transmit pressure.
[0013] Furthermore, the inner end face of the seal is flush with the end face of the dolomite tube, which increases the sealing performance of the double-section pyrophyllite block and prevents "blow-ups" caused by the poor rheological properties and poor resilience of ordinary pyrophyllite during the pressure relief process due to the gas generated during the high-temperature and high-pressure synthesis process.
[0014] The beneficial effects of the present invention are as follows: the high-stability diamond synthetic block with a cavity diameter of more than 70 mm has the following advantages: (1) The seal made of natural pyrophyllite from South Africa and the double-section pyrophyllite block of the present invention provide a seal for the diamond synthesis block, which can greatly reduce the probability of pressure relief high-pressure leakage when synthesizing artificial diamonds with a cavity larger than 70 mm, ensure the stability of diamond production, reduce production costs, and play a certain role in promoting the popularization of six-sided top presses with a cylinder diameter of more than Ø900; (2) The convex ring of the present invention cooperates with the plug hole to improve the sealing performance during the synthesis of the diamond synthetic block.
[0015] (3) The inner end surface of the seal of the present invention is flush with the end surface of the dolomite tube, which increases the sealing performance of the double-section pyrophyllite block and prevents the "blow-up" phenomenon caused by the poor rheological properties and poor resilience of ordinary pyrophyllite during the pressure relief process due to the gas generated during the high-temperature and high-pressure synthesis process. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a three-dimensional diagram of a high-stability diamond synthetic block of a cavity with a diameter of more than 70 mm according to the present invention; Figure 2 yes Figure 1 A top view of Figure 3 yes Figure 2 AA half section view; Figure 4 yes Figure 3 BB cross-sectional view; Figure 5 yes Figure 3 CC section view; Figure 6 This is a real photo of a high-stability diamond synthetic block with a cavity having a diameter of more than 70 in the present invention; In the figure: 1. double-section pyrophyllite block, 11. embedding groove, 12. dividing seam A, 2. plug assembly, 21. plug, 211. disc, 212. central axis, 22. pressure-penetrating medium, 23. pyrophyllite ring, 3. heating belt, 41. insulating cup, 411. dividing seam B, 42. iron cup, 421. dividing seam C, 5. graphite column, 6. sealing element, 61. plug hole, 611. sinking groove, 62. convex ring, 7. dolomite tube, 8. graphite disc. DETAILED DESCRIPTION
[0017] Example 1: See Figure 1-5 A high-stability diamond synthetic block with a cavity diameter of more than 70 mm is a cube as a whole, comprising a double-section pyrophyllite block 1 of a rectangular box body, a plug assembly 2, an annular heating belt 3, an insulating cup 41, a graphite column 5, and a seal 6 made of South African natural pyrophyllite; the graphite column 5 is filled in the insulating cup 41; the heating belt 3 is sleeved outside the insulating cup 41; the double-section pyrophyllite block 1 is sleeved outside the insulating cup 41; the plug assembly 2 is installed at the upper and lower ends of the double-section pyrophyllite block 1; the seal 6 is buckled at the upper and lower ends of the double-section pyrophyllite block 1; the South African natural pyrophyllite is mainly pyrophyllite, followed by kaolinite, and has the characteristics of "high aluminum and low silicon", SiO 2 The content is 58.05%, Al 2 O 3 The content is 31.46%, with a flaky metamorphic structure and a high degree of crystallinity; therefore, the seal 6 made of natural pyrophyllite from South Africa has a small volume shrinkage at high temperature and excellent rheological properties; when in use, the seal 6 cooperates with the double-section pyrophyllite block 1 to provide a seal for the diamond synthesis block, which can greatly reduce the probability of pressure relief high-pressure leakage when synthesizing artificial diamonds in a cavity above 70mm, ensure the stability of diamond synthesis, reduce production costs, and play a certain role in promoting the popularization of six-sided top presses with a cylinder diameter of Ø900 or more; a plug hole 61 matching the plug assembly 2 is provided in the center of the seal 6; the plug assembly 2 is inserted in the plug hole 61; the plug assembly 2 supplies power to the graphite column 5 to apply pressure.
[0018] Compared with the prior art, the seal 6 made of natural pyrophyllite from South Africa and the double-section pyrophyllite block 1 of the present invention provide a seal for the diamond synthesis block, which can greatly reduce the probability of pressure relief high-pressure leakage when synthesizing artificial diamonds in a cavity larger than 70mm, ensure the stability of diamond synthesis, reduce production costs, and play a certain role in promoting the popularization of six-sided top presses with a cylinder diameter of more than Ø900.
[0019] The high-stability diamond synthetic block with a cavity with a diameter of more than 70 mm also includes a dolomite tube 7; an embedding groove 11 matching the dolomite tube 7 is provided inside the double-section pyrophyllite block 1; the dolomite tube 7 is embedded in the embedding groove 11 to form a whole with the double-section pyrophyllite block 1; the double-section pyrophyllite block 1 and the dolomite tube 7 are a composite structure, the inner diameter of the dolomite tube 7 is consistent with the inner hole size of the double-section pyrophyllite block 1, and the edge of the dolomite tube 7 is 3-8 mm away from the edge of the double-section pyrophyllite block 1; in this embodiment, the edge of the dolomite tube 7 is 3 mm away from the edge of the double-section pyrophyllite block 1; the double-section pyrophyllite block 1 and the dolomite tube 7 cooperate with each other to transmit pressure to the graphite column 5; a horizontal dividing seam 12 is provided in the middle of the double-section pyrophyllite block 1, which divides the double-section pyrophyllite block 1 into two parts that are buckled up and down to facilitate the assembly of the diamond synthetic block; the double-section pyrophyllite block 1 is a double-section structure that can be separated up and down.
[0020] The high-stability diamond synthetic block with a cavity diameter of more than 70 mm also includes a graphite disc 8 ; the circumference of the graphite disc 8 is connected to the inner wall of the double-section pyrophyllite block 1 ; there are two graphite discs 8 symmetrically arranged at the upper and lower ends of the insulating cup 41 .
[0021] A dividing seam B 411 is provided in the middle of the insulating cup 41; a dividing seam C 421 is provided in the middle of the iron cup 42; the dividing seam B 411 divides the porcelain cup into two parts, the dividing seam C 421 divides the iron cup 42 into two parts, so that it is convenient to put the graphite column 5 into the insulating cup 41.
[0022] The dividing seam A 12 , dividing seam B 411 , and dividing seam C 421 are on the same horizontal plane, which can reduce the difficulty of assembling the diamond synthetic block.
[0023] The inner side of the seal 6 is provided with a convex ring 62; the outer wall of the convex ring 62 is connected to the inner hole of the double-section pyrophyllite block 1; the inner wall of the convex ring 62 corresponds to the plug hole 61; the convex ring 62 cooperates with the plug hole 61 to increase the sealing performance during the synthesis of the diamond synthetic block.
[0024] The plug assembly 2 includes a plug 21, a pressure-piercing medium 22, and a talc ring 23; the plug 21 includes a connected disc 211 and a center axis 212; the pressure-piercing medium 22 and the talc ring 23 have inner walls connected to the center axis 212, and outer walls connected to the plug hole 61; the pressure-piercing medium 22 abuts against the disc 211; the talc ring 23 abuts against the pressure-piercing medium 22; in this embodiment, the pressure-piercing medium 22 is a dolomite ring.
[0025] The outer end of the plug hole 61 is provided with a sinking groove 611 matching the disc 211; the disc 211 is embedded in the sinking groove 611 to reduce the height difference between the end face of the disc 211 and the end face of the sealing member 6, which is beneficial to the transmission of pressure.
[0026] The end face of the central shaft 212, the end face of the pyrophyllite ring 23, and the inner end face of the seal 6 are flush to evenly transmit pressure.
[0027] Working principle of this embodiment: South African natural pyrophyllite is mainly composed of pyrophyllite, followed by kaolinite, and has the characteristics of "high aluminum and low silicon", with a SiO2 content of 58.05%, an Al2O3 content of 31.46%, a scaly metamorphic structure, and a high degree of crystallinity; therefore, the seal 6 made of South African natural pyrophyllite has a small volume shrinkage at high temperature and excellent rheological properties; when in use, the seal 6 cooperates with the double-section pyrophyllite block 1 to provide sealing for the diamond synthesis block, which can greatly reduce the probability of pressure relief high-pressure leakage when synthesizing artificial diamonds above a 70mm cavity, ensure the stability of diamond synthesis, reduce production costs, and play a certain role in promoting the popularization of six-sided top presses above Ø900 cylinder diameter; the plug assembly 2 supplies power to the graphite column 5 and applies pressure. The convex ring 62 cooperates with the plug hole 61 to increase the sealing performance of the diamond synthesis block during synthesis.
[0028] Embodiment 2: Embodiment 2 is basically the same as Embodiment 1, and the similarities are not repeated here. The differences are as follows: the inner end face of the graphite disc 8 and the end face of the insulating cup 41 are connected, and the inner end face of the seal 6 is flush with the end face of the dolomite tube 7, thereby increasing the sealing performance of the double-section pyrophyllite block 1 and preventing the gas generated during the high-temperature and high-pressure synthesis process from "blasting" during the pressure relief process due to the poor rheological properties and poor resilience of ordinary pyrophyllite.
[0029] The end face of the end cover is aligned with the side face of the double-section pyrophyllite block 1, which can maximize the sealing performance at the end cover.
Claims
1. A high-stability diamond synthetic block with a cavity diameter of more than 70 mm, which is a cubic block as a whole, including a double-section pyrophyllite block in a rectangular box, a plug assembly, a heating element, an insulating cup, an iron cup, a graphite column, and a seal made of natural pyrophyllite from South Africa; the graphite column is filled in the iron cup; the insulating cup is sleeved outside the iron cup; the insulating cup is wrapped with a heating element outside; the double-section pyrophyllite block is sleeved outside the heating element; the plug assembly is installed at the upper and lower ends of the double-section pyrophyllite block; characterized in that, The diamond synthetic block also includes a seal made of natural pyrophyllite from South Africa; the seal is buckled at the upper and lower ends of the double-section pyrophyllite block; a plug hole matching the plug assembly is arranged at the center of the seal; and the plug assembly is inserted into the plug hole.
2. The high stability diamond synthetic block with a cavity diameter of more than 70 mm according to claim 1, characterized in that: It also includes a dolomite tube; an embedding groove matching the dolomite tube is arranged inside the double-section pyrophyllite block; and the dolomite tube is embedded in the embedding groove.
3. The high stability diamond synthetic block with a cavity diameter of more than 70 mm according to claim 1, characterized in that: It also includes a graphite disc; the circumference of the graphite disc is connected to the inner wall of the double-section pyrophyllite block; there are two graphite discs, which are symmetrically arranged at the upper and lower ends of the insulating cup.
4. The high stability diamond synthetic block with a cavity diameter of more than 70 mm according to claim 1, characterized in that: A dividing seam B is arranged in the middle of the insulating cup; and a dividing seam C is arranged in the middle of the iron cup.
5. The high stability diamond synthetic block with a cavity diameter of more than 70 mm according to claim 1, characterized in that: A convex ring is arranged on the inner side of the sealing member; the outer wall of the convex ring is connected with the inner hole of the double-section pyrophyllite block; and the inner wall of the convex ring corresponds to the plug hole.
6. The high stability diamond synthetic block with a cavity diameter of more than 70 mm according to any one of claims 1 to 3, characterized in that: The plug assembly includes a plug, a pressure-penetrating medium, and a pyrophyllite ring; the plug includes a connected disc and a central axis; the pressure-penetrating medium and the pyrophyllite ring have inner walls connected to the central axis and outer walls connected to the plug hole; the pressure-penetrating medium abuts against the disc; the pyrophyllite ring abuts against the pressure-penetrating medium.
7. The high stability diamond synthetic block with a cavity diameter of more than 70 mm according to claim 6, characterized in that: The outer end of the plug hole is provided with a sinking groove matching the disc; the disc is embedded in the sinking groove.
8. The high stability diamond synthetic block with a cavity diameter of more than 70 mm according to claim 6, characterized in that: The end face of the center shaft, the end face of the pyrophyllite ring and the inner end face of the seal are flush.
9. The high stability diamond synthetic block with a cavity diameter of more than 70 mm according to claim 8, characterized in that: The inner end surface of the graphite disc and the end surface of the insulating cup are connected.
10. The high-stability diamond synthetic block with a cavity diameter of more than 70 mm according to claim 8, characterized in that: The inner end face of the seal is flush with the end face of the dolomite pipe.