Cubic boron nitride high-pressure synthesis device

Abstract

This utility model relates to the technical field of superhard material synthesis equipment, and discloses a cubic boron nitride high-pressure synthesis device, including: a frame, six top hammers, six hydraulic cylinders, a heating device, a pressure transmitting medium, an insulating cup, and a control cabinet. This cubic boron nitride high-pressure synthesis device, through a rigid frame structure, consists of a frame composed of twelve columns and eight corner connectors, with six mounting panels forming uniform force support. This reduces structural deformation and pressure fluctuations during high-pressure synthesis, extending the equipment's lifespan. The top hammer extrusion end has a built-in infrared temperature sensor that directly detects the internal temperature through a sapphire window, resulting in a more timely response and preventing localized overheating or insufficient temperature. The insulating cup is sealed with a graphite gasket and a cover plate, reducing contamination from contact between the raw materials and the pressure transmitting medium, while also reducing heat loss.

Description

Technical Field

[0001] This utility model relates to the technical field of superhard material synthesis equipment, specifically a high-pressure synthesis device for cubic boron nitride. Background Technology

[0002] Cubic boron nitride (CBN), as an important category of superhard materials, relies on high-temperature, high-pressure (HTHP) synthesis equipment for its industrial production. In existing technologies, the six-sided top press, as the mainstream equipment, has the following drawbacks: traditional top hammers do not contain temperature detection devices, making it impossible to sense whether the temperature during the synthesis of cubic boron nitride is appropriate; furthermore, conventional heating systems are relatively simple, resulting in large temperature fluctuations, leading to incomplete CBN crystal transformation and significant deviations in product hardness. Utility Model Content

[0003] (a) Technical problems to be solved

[0004] To overcome the aforementioned deficiencies of the prior art, this utility model provides a high-pressure synthesis apparatus for cubic boron nitride, which solves the problems in the prior art:

[0005] Traditional top hammers do not contain temperature detection devices, making it impossible to sense whether the temperature during the synthesis of cubic boron nitride is appropriate. Furthermore, conventional heating systems are relatively simple and experience large temperature fluctuations, leading to incomplete CBN crystal transformation and significant deviations in product hardness.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: a high-pressure synthesis device for cubic boron nitride, comprising: a frame, six top hammers, six hydraulic cylinders, a heating device, a pressure transmitting medium, an insulating cup, and a control cabinet. The frame is a rigid frame structure composed of twelve columns and eight corner connectors, and mounting panels are installed on all six sides. The six top hammers are respectively mounted in the center of the mounting panels by their respective matching six hydraulic cylinders. The heating device includes graphite heating tubes and a hot air circulation assembly. The pressure transmitting medium is composed of an alumina skeleton and a filling material. An insulating cup is provided in the center of the pressure transmitting medium to isolate the graphite heating tubes from the raw materials and prevent contamination.

[0008] Optionally, a sapphire window is provided in the middle of the top hammer extrusion end, and an infrared temperature sensor is provided inside the top hammer extrusion end, which detects temperature through the sapphire window.

[0009] Optionally, a graphite pad is placed at the bottom of the insulating cup, and a graphite cover plate of the same specifications is placed on top.

[0010] Optionally, the pressure-transmitting medium is placed at the center of the device and fixed by compression from six top hammers.

[0011] Optionally, the hot air circulation assembly includes a fan and a guide pipe, which are mounted on the left and right mounting panels of the device. The air outlet of the fan faces the inside of the device, forming a double closed-loop temperature control system with the graphite heating tube.

[0012] (III) Beneficial Effects

[0013] This invention provides a high-pressure synthesis apparatus for cubic boron nitride, which has the following advantages:

[0014] This cubic boron nitride high-pressure synthesis unit features a rigid frame structure consisting of twelve columns and eight corner connectors. The six mounting panels provide uniform support, reducing structural deformation and pressure fluctuations during high-pressure synthesis and extending equipment lifespan. An infrared temperature sensor is integrated into the top hammer extrusion end, directly detecting the internal temperature through a sapphire window for more timely response and to prevent localized overheating or underheating. The insulating cup is sealed with a graphite gasket and cover plate, reducing contamination from contact between the raw material and the pressure-transmitting medium while minimizing heat loss. The pressure-transmitting medium is fixed in the center by the six top hammers, preventing pressure transmission deviations caused by displacement and ensuring more balanced stress on the raw material, reducing defects such as cracks. The hot air circulation components on the left and right mounting panels create symmetrical airflow, minimizing temperature dead zones and ensuring complete crystal transformation. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This utility model Figure 1 Schematic diagram of cross-section structure;

[0017] Figure 3 This utility model Figure 2 A schematic diagram of the structure after the pressure transmission medium has been removed.

[0018] Figure 4 This is a cross-sectional structural diagram of the pressure transmission medium of this utility model;

[0019] Figure 5 This is an exploded structural diagram of the top hammer and hydraulic cylinder of this utility model.

[0020] In the diagram: 1. Frame; 2. Top hammer; 3. Hydraulic cylinder; 4. Heating device; 5. Pressure transmission medium; 6. Insulating cup; 7. Control cabinet; 11. Column; 12. Corner connector; 13. Mounting panel; 21. Infrared temperature sensor; 22. Sapphire window; 41. Graphite heating tube; 42. Hot air circulation assembly; 421. Fan; 422. Guide pipe; 51. Alumina skeleton; 52. Filling material; 61. Graphite gasket; 62. Graphite cover plate. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0022] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by those skilled in the art. The terms "first," "second," and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0023] Example 1:

[0024] Please see Figures 1 to 5 This utility model provides a technical solution: a cubic boron nitride high-pressure synthesis device. The frame 1 is a rigid frame structure composed of twelve columns 11 and eight corner connectors 12, and mounting panels 13 are installed on all six sides. Six top hammers 2 are respectively installed in the center of the mounting panels 13 via six matching hydraulic cylinders 3. A sapphire window 22 is provided in the center of the extrusion end of each top hammer 2, and an infrared temperature sensor 21 is installed inside the extrusion end of the top hammer 2. The infrared temperature sensor 21 detects temperature through the sapphire window 22. The frame 1 is forged from high-strength alloy steel. Multiple columns 11 and corner connectors 12 are fastened together with high-strength bolts to form a rigid frame structure. Six mounting panels 13 are fixed to each side of the frame. The center of the panel is provided with mounting holes and a positioning structure is machined. The top hammer 2 is rigidly connected to the piston rod of the hydraulic cylinder 3 through a flange. The flange has circumferentially distributed connecting holes, which are fastened with bolts. The mounting holes of the hydraulic cylinder 3 and the mounting panel 13 are clearance-fitted to ensure the coaxiality of the top hammer 2. The pressure transmission medium 5 is placed in the center of the device. The extrusion end faces of the six top hammers 2 are symmetrically attached to its outer surface. The hydraulic cylinder 3 applies a pre-tightening force to fix them and prevent displacement during the synthesis process.

[0025] Example 2:

[0026] The heating device 4 includes a graphite heating tube 41 and a hot air circulation assembly 42. The hot air circulation assembly 42 includes a fan 421 and a guide pipe 422, which are installed on the left and right mounting panels 13 of the device. The air outlet of the fan 421 faces the inside of the device, forming a double closed-loop temperature control system with the graphite heating tube 41. The graphite heating tube 41 of the heating device 4 is placed outside the insulating cup 6. The hot air circulation assembly 42 on the left and right mounting panels 13 sends air into the device through the fan 421 and the guide pipe 422. The airflow is guided by the guide pipe 422 to form a circulation, and works with the graphite heating tube 41 to achieve temperature regulation.

[0027] Example 3:

[0028] The pressure transmitting medium 5 is composed of an alumina skeleton 51 and a filling material 52. An insulating cup 6 is provided in the middle of the pressure transmitting medium 5 to isolate the graphite heating tube 41 from the raw material and avoid contamination. The pressure transmitting medium 5 is placed in the center of the device and is fixed by compression by six top hammers 2. The pressure transmitting medium 5 is composed of an alumina skeleton 51 and a filling material 52. It is placed in the center of the device and is fixed by compression by six top hammers 2. The pressure transmitting medium 5 has a reserved space in the middle to accommodate the insulating cup 6. A graphite gasket 61 is placed at the bottom of the insulating cup 6 and a graphite cover plate 62 is covered on the top to form a closed raw material receiving cavity, thereby isolating the graphite heating tube 41 from the raw material and avoiding contamination by impurities.

[0029] All electrical components mentioned in this article are connected to an external main controller and 220V AC mains power, and the main controller can be a conventional known device such as a computer that can control it.

[0030] In this invention, the working steps of the device are as follows:

[0031] First, hexagonal boron nitride is mixed with a catalyst in a certain proportion and placed into an insulating cup 6. Graphite gasket 61 and cover plate are then placed in sequence. The insulating cup 6 is then placed into the center hole of the pressure transmitting medium 5. The pressure transmitting medium 5 is placed in the center of the device. The hydraulic cylinder 3 is activated to drive the top hammer 2 to adhere to its surface and apply pre-tightening force. The control cabinet 7 starts the graphite heating tube 41 to heat up, and the hot air circulation component 42 operates synchronously. The hydraulic cylinder 3 pressurizes at a set rate to maintain the set temperature and pressure conditions. The infrared temperature sensor 21 monitors in real time. The control cabinet 7 adjusts the heating power to keep it stable. After heating stops and cooling is completed, the pressure is slowly released. After the top hammer 2 resets, the pressure transmitting medium 5 is removed, and the insulating cup 6 is disassembled to collect the product.

[0032] Although embodiments of the present 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 present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-pressure synthesis apparatus for cubic boron nitride, characterized in that, include: The frame (1), six top hammers (2), six hydraulic cylinders (3), heating device (4), pressure transmission medium (5), insulating cup (6) and control cabinet (7) are provided. The frame (1) is a rigid frame structure composed of twelve columns (11) and eight corner connectors (12), and mounting panels (13) are installed on all six sides. The six top hammers (2) are respectively installed in the middle of the mounting panel (13) by their respective matching six hydraulic cylinders (3). The heating device (4) includes a graphite heating tube (41) and a hot air circulation assembly (42). The pressure transmission medium (5) is composed of an alumina skeleton (51) and a filling material (52). An insulating cup (6) is provided in the middle of the pressure transmission medium (5) to isolate the graphite heating tube (41) from the raw material and avoid contamination.

2. The apparatus for high-pressure synthesis of cubic boron nitride according to claim 1, characterized by: A sapphire window (22) is provided in the middle of the extrusion end of the top hammer (2), and an infrared temperature sensor (21) is provided inside the extrusion end of the top hammer (2). The infrared temperature sensor detects the temperature through the sapphire window (22).

3. The apparatus for high-pressure synthesis of cubic boron nitride according to claim 1, wherein: The bottom of the insulating cup (6) is covered with a graphite pad (61) and the top is covered with a graphite cover plate (62) of the same specification.

4. The apparatus for high-pressure synthesis of cubic boron nitride according to claim 1, wherein: The pressure-transmitting medium (5) is placed in the center of the device and fixed by being squeezed by six top hammers (2).

5. The apparatus for high-pressure synthesis of cubic boron nitride according to claim 1, wherein: The hot air circulation assembly (42) includes a fan (421) and a guide pipe (422), which are installed on the left and right mounting panels (13) of the device. The air outlet of the fan (421) faces the inside of the device and forms a double closed-loop temperature control system with the graphite heating tube (41).

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