Energy-saving controllable high-temperature high-pressure cavity and processing method thereof

Abstract

The application discloses an energy-saving controllable high-temperature high-pressure cavity and relates to the technical field of superhard material synthesis devices. The structure comprises a cavity main body and a power supply. A center channel is arranged in the cavity main body. Two plugs are arranged at the two ends of the center channel. The two plugs can be electrically connected with the positive and negative poles of the power supply respectively. A first pressure transmission sealing ring and a second pressure transmission sealing ring are arranged on the plugs. An electrically-conductive current collector is arranged on the inner side of the plug. A heat-insulating throttling ring is arranged on the inner side of the electrically-conductive current collector. A plurality of adjusting through holes are arranged on the heat-insulating throttling ring. A heating cavity is arranged between the two heat-insulating throttling rings. The method comprises the following steps: S1, processing the heat-insulating throttling ring; S2, placing the heat-insulating throttling ring in a muffle furnace for roasting; S3, compacting the heat-insulating throttling ring in a planar press after cooling; S4, assembling all the parts; and S5, pressurizing the six-surface press, and providing the heating cavity with current through the current. The application can control the heating temperature of the superhard material.

Description

Technical Field

[0001] This invention relates to the field of superhard material processing and synthesis equipment, and in particular to an energy-saving and controllable high-temperature and high-pressure cavity and its processing method. Background Technology

[0002] The synthesis of existing superhard material particles and superhard material composite sheets all require high-pressure cavities. A six-sided press applies the same force to the six faces of a cubic pyrophyllite block to create high pressure inside, thus obtaining a high-pressure cavity.

[0003] In the design of high-pressure chambers, once the design is complete, any modifications to the internal structure require corresponding mold components to complete the modification of the component structure. These modifications involve remaking the molds, increasing mold costs. In high-temperature, high-pressure synthesis, electricity needs to be passed through the chamber to generate current for heating. Therefore, current collectors are needed at both ends to achieve electrical conduction. However, the internal heat of the high-pressure chamber will simultaneously be lost through the current collectors.

[0004] Generally, there are two methods to increase the temperature of the cavity: one is to increase the heating power, but increasing the power may cause the current to be too high and may burn out the top hammer; the other is to increase the insulation material, but the cavity itself is limited by the space of the six-sided top press and cannot greatly increase the amount of insulation material.

[0005] Therefore, there is an urgent need in this field for a simple, energy-efficient, and controllable high-temperature and high-pressure cavity and its processing method to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to provide an energy-saving and controllable high-temperature and high-pressure cavity and its processing method, which solves the technical problems existing in the prior art. The heating temperature of the heating cavity for superhard materials is controlled by adjusting the regulating through hole.

[0007] To achieve the above objectives, the present invention provides the following solution:

[0008] This invention discloses an energy-saving and controllable high-temperature and high-pressure cavity, comprising a cavity body and a power supply. The cavity body has a central channel, and each end of the central channel is provided with a plug, which can be electrically connected to the positive and negative terminals of the power supply, respectively. A first pressure-transmitting sealing ring and a second pressure-transmitting sealing ring are fitted on the plugs. A conductive current collector is provided inside the plugs, and a heat-insulating throttling ring is provided inside the conductive current collector. The heat-insulating throttling ring is provided with several adjustment through holes. A heating cavity is provided between the two heat-insulating throttling rings, and the heating cavity is used to place superhard materials.

[0009] Preferably, the cavity body has a regular hexahedral structure and is made of pyrophyllite.

[0010] Preferably, the plug includes a circular plate portion and a cylindrical portion, the cylindrical portion being located inside the circular plate portion, the first pressure-transmitting sealing ring and the second pressure-transmitting sealing ring being sleeved on the cylindrical portion, and the second pressure-transmitting sealing ring being closer to the conductive current collector than the first pressure-transmitting sealing ring.

[0011] Preferably, the first pressure-transmitting sealing ring is a pyrophyllite ring, and the second pressure-transmitting sealing ring is a dolomite ring.

[0012] Preferably, the conductive current collector includes one or more of conductive ceramic sheets, hard alloy sheets, impact steel sheets, and bearing steel sheets.

[0013] Preferably, the heat-insulating throttling ring is a mica sheet ring, a zirconia ring, or a dolomite ring.

[0014] Preferably, the heating cavity includes a heating tube and two heating plates, the axial direction of the heating tube is the same as the axial direction of the central channel, and the two heating plates are respectively fixed to both ends of the heating tube;

[0015] Both the heating tube and the heating element are made of graphite.

[0016] This invention also discloses a method for processing an energy-saving and controllable high-temperature and high-pressure cavity, comprising the following steps:

[0017] S1. Machining the heat insulation throttling ring to match its outer diameter with the inner diameter of the central channel, and machining the adjustment through hole;

[0018] S2. Place the heat-insulating throttling ring in a muffle furnace for roasting;

[0019] S3. After cooling the heat insulation throttling ring, compact it in a flat press.

[0020] S4. Assemble all the parts;

[0021] The S5 six-sided press applies pressure and provides current to the heating chamber to process ultra-hard materials.

[0022] The present invention achieves the following technical effects compared to the prior art:

[0023] This invention achieves energy-saving temperature control by adjusting the number and size of the regulating holes on the heat insulation throttling ring, thereby changing the overall resistance of the ring while ensuring a consistent current supply. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of the energy-saving and controllable high-temperature and high-pressure cavity according to an embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of the structure of the heat-insulating throttling ring in the energy-saving and controllable high-temperature and high-pressure cavity according to an embodiment of the present invention;

[0027] In the diagram: 1-Cavity body; 2-Power supply; 3-Plug; 4-First pressure-transmitting sealing ring; 5-Second pressure-transmitting sealing ring; 6-Conductive current collector; 7-Heat insulation throttling ring; 8-Heating cavity; 9-Top hammer. Detailed Implementation

[0028] 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.

[0029] The purpose of this invention is to provide an energy-saving and controllable high-temperature and high-pressure cavity and its processing method, which solves the technical problems existing in the prior art. The heating temperature of the heating cavity for superhard materials is controlled by adjusting the regulating through hole.

[0030] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] Example 1

[0032] like Figures 1-2 As shown, this embodiment provides an energy-saving and controllable high-temperature and high-pressure cavity, including a cavity body 1 and a power supply 2. The cavity body 1 has a central channel that runs through the entire cavity body 1. The central channel has a circular cross-sectional shape. A plug 3 is provided at each end of the central channel. The two plugs 3 are electrically connected to the positive and negative terminals of the power supply 2, respectively. A first pressure-transmitting sealing ring 4 and a second pressure-transmitting sealing ring 5 are fitted on the plugs 3. A conductive current collector 6 is provided on the inner side of the plug 3. A heat-insulating throttling ring 7 is provided on the inner side of the conductive current collector 6. The heat-insulating throttling ring 7 is provided with several adjustment through holes. A heating cavity 8 is provided between the two heat-insulating throttling rings 7. The heating cavity 8 is used to place ultrahard materials.

[0033] In actual processing, the six hammers 9 of the six-sided press can respectively press the six sides of the main body 1 of the cavity. The two hammers 9 that are in contact with the two plugs 3 are electrically connected to the positive and negative terminals of the power supply 2, respectively. The positive and negative terminals of the power supply 2 are electrically connected to the two plugs 3 through the two hammers 9. The power supply 2 supplies power to the heating cavity 8. The current provided by the power supply 2 flows through the hammers 9, plugs 3, conductive current collectors 6 and heat-insulating throttling rings 7 in sequence, and finally flows into the heating cavity 8, so as to heat the ultra-hard material. When it is necessary to adjust the heat output, it is only necessary to change the size of the adjustment through hole. Under the same current, the smaller the total diameter of the adjustment through hole, the greater its resistance, which increases the heating power and thus the heat output; and vice versa.

[0034] In this embodiment, the main body 1 of the cavity is a regular hexahedron structure, and its specific size must match the six-sided top press. The material of the main body 1 of the cavity is pyrophyllite.

[0035] In this embodiment, the plug 3 includes a circular plate portion and a cylindrical portion. The cylindrical portion is located inside the circular plate portion, and the circular plate portion is located at the port of the central channel. The first pressure-transmitting sealing ring 4 and the second pressure-transmitting sealing ring 5 are both sleeved on the cylindrical portion. The second pressure-transmitting sealing ring 5 is closer to the conductive current collector 6 than the first pressure-transmitting sealing ring 4. The plug 3 is electrically connected to the power supply 2, and its main function is to conduct electricity.

[0036] In this embodiment, the first pressure-transmitting sealing ring 4 is a pyrophyllite ring, and the second pressure-transmitting sealing ring 5 is a dolomite ring. They have the same function: first, to transmit pressure from the six-sided top press; second, to seal and ensure that the interior of the cavity body 1 maintains a high temperature and high pressure environment.

[0037] In this embodiment, the conductive current collector 6 includes one or more of the following: conductive ceramic sheet, hard alloy sheet, impact steel sheet, and bearing steel sheet. That is, any one of these sheet structures can be stacked together, or a mixture of multiple sheet structures can be used. The function of the conductive current collector 6 is to transfer the current from the plug 3 to the heating chamber 8. Furthermore, a harder material is chosen to improve the pressure-passing efficiency, ensuring that more pressure from the six-sided press is transferred to the ultra-hard material, thereby achieving the pressure-boosting effect. It can be seen that the specific pressure can be adjusted by changing the specific structure of the conductive current collector 6.

[0038] In this embodiment, the heat-insulating throttling ring 7 is a mica sheet ring, a zirconia ring, or a dolomite ring. Preferably, it is a mica sheet ring (i.e., a ring structure made of mica sheets). In addition, either natural mica sheets or artificial mica sheets can be used.

[0039] like Figure 2As shown, an adjustment through-hole is provided at the center of the heat insulation throttling ring 7. Under a given power, the larger the diameter of the adjustment through-hole of the heat insulation throttling ring 7, the smaller the local resistance and the less heat is generated; conversely, under a given power, the smaller the diameter of the adjustment through-hole of the heat insulation throttling ring 7, the larger the local resistance, thereby increasing the heating efficiency at that location. The heat loss due to the obstruction of the small diameter is also less, so the required power is smaller.

[0040] In this embodiment, the heating cavity 8 includes a heating tube and two heating plates. The axial direction of the heating tube is the same as the axial direction of the central channel, and the two heating plates are respectively fixed to both ends of the heating tube.

[0041] Both the heating tube and the heating element are made of graphite, meaning that existing graphite heating sheets and heating graphite tubes can be used. Alternatively, other heating materials can be used, as long as they can provide the expected high-temperature environment for the superhard material.

[0042] It should be noted that the high-temperature environment in this embodiment is 1100-1800℃, and the high-pressure environment is 4.5-7.0 GPa. Of course, those skilled in the art can adjust the relevant data appropriately according to the actual situation.

[0043] Example 2

[0044] This embodiment provides a processing method for the energy-saving and controllable high-temperature and high-pressure cavity based on Embodiment 1, including the following steps:

[0045] S1. Process the heat insulation throttling ring 7 so that its outer diameter matches the inner diameter of the central channel, and process an adjustment through hole. The heat insulation throttling ring 7 is made of natural mica sheet with a thickness of 0.15mm, and is processed into a circular sheet with a size equivalent to that of the central channel (the inner diameter of the central channel is 42mm). The center of the natural mica sheet is punched to form an adjustment through hole with a diameter of 8mm.

[0046] S2. Place the heat insulation throttling ring 7 in a muffle furnace for calcination at 600℃ for 20 minutes.

[0047] S3. After cooling the heat insulation throttling ring 7, compact it in a flat press and adjust its thickness to 0.15mm.

[0048] S4. Assemble all the parts, that is, place the heat insulation throttling ring 7 between the heating element and the conductive current collector 6, and install the plug 3, the first pressure transmission sealing ring 4, the second pressure transmission sealing ring 5, and the heating cavity 8.

[0049] S5, the six-sided top press applies pressure to 5GPa, and provides current to the heating chamber 8 through current. The heating power is 4000w, and the temperature reaches 1300℃ after heating for 114 seconds, in order to process the superhard material.

[0050] Example 3

[0051] This embodiment provides a method for processing an energy-saving and controllable high-temperature and high-pressure cavity. Its disclosed technical features are basically the same as those in Embodiment 2, except that it includes the following steps:

[0052] S1. Process a 0.15mm thick natural mica sheet (i.e., heat insulation throttling ring 7) into a circular sheet with a diameter of 42mm, which is equivalent to the size of the central channel. Punch a hole (i.e., an adjustment through hole) in the center of the circular sheet. The diameter of the adjustment through hole is 12mm.

[0053] S2. Place the natural mica sheets in a muffle furnace, set the temperature to 600℃ and bake for 20 minutes;

[0054] S3. After cooling, compact the material in a flatbed press to adjust the thickness to 0.15mm;

[0055] S4. Place the natural mica sheet between the conductive current collector 6 and the heating element, and assemble the other parts.

[0056] S5. Control the six-sided top press to pressurize to 5GPa, with a heating power of 4000w. The temperature reaches 1300℃ after 167 seconds.

Claims

1. An energy-saving and controllable high-temperature and high-pressure cavity, characterized in that: The device includes a cavity body and a power supply. The cavity body has a central channel, and each end of the central channel has a plug. The two plugs can be electrically connected to the positive and negative terminals of the power supply, respectively. A first pressure-transmitting sealing ring and a second pressure-transmitting sealing ring are fitted on the plugs. A conductive current collector is provided inside the plugs. A heat-insulating throttling ring is provided inside the conductive current collector. Several adjustment through holes are provided on the heat-insulating throttling rings. A heating cavity is provided between the two heat-insulating throttling rings. The heating cavity is used to place superhard materials.

2. The energy-saving and controllable high-temperature and high-pressure cavity according to claim 1, characterized in that: The main body of the cavity has a regular hexahedral structure and is made of pyrophyllite.

3. The energy-saving and controllable high-temperature and high-pressure cavity according to claim 1, characterized in that: The plug includes a circular plate portion and a cylindrical portion. The cylindrical portion is located inside the circular plate portion. The first pressure-transmitting sealing ring and the second pressure-transmitting sealing ring are both sleeved on the cylindrical portion. The second pressure-transmitting sealing ring is closer to the conductive current collector than the first pressure-transmitting sealing ring.

4. The energy-saving and controllable high-temperature and high-pressure cavity according to claim 1, characterized in that: The first pressure-transmitting sealing ring is a pyrophyllite ring, and the second pressure-transmitting sealing ring is a dolomite ring.

5. The energy-saving and controllable high-temperature and high-pressure cavity according to claim 1, characterized in that: The conductive current collector includes one or more of the following: conductive ceramic sheet, cemented carbide sheet, impact steel sheet, and bearing steel sheet.

6. The energy-saving and controllable high-temperature and high-pressure cavity according to claim 1, characterized in that: The heat-insulating throttling ring is a mica sheet ring, a zirconia ring, or a dolomite ring.

7. The energy-saving and controllable high-temperature and high-pressure cavity according to claim 1, characterized in that: The heating cavity includes a heating tube and two heating plates. The axial direction of the heating tube is the same as the axial direction of the central channel, and the two heating plates are respectively fixed to both ends of the heating tube. Both the heating tube and the heating element are made of graphite.

8. A processing method for an energy-saving and controllable high-temperature and high-pressure cavity according to any one of claims 1-7, characterized in that, Includes the following steps: S1. Machining the heat insulation throttling ring to match its outer diameter with the inner diameter of the central channel, and machining the adjustment through hole; S2. Place the heat-insulating throttling ring in a muffle furnace for roasting; S3. After cooling the heat insulation throttling ring, compact it in a flat press. S4. Assemble all the parts; The S5 six-sided press applies pressure and provides current to the heating chamber to process ultra-hard materials.

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