A synthetic block structure with seed temperature regulation function

Abstract

The utility model relates to six -sided top press high temperature -high pressure diamond single crystal synthesis technical field relates to a kind of synthesis block structure with seed temperature regulating function, including talc powder briquetting, crystal growth container, heating loop and seed heating component, talc powder briquetting includes first talc powder briquetting and second talc powder briquetting, and same diameter cavity is separately arranged in first talc powder briquetting and second talc powder briquetting;Heating loop includes first heating device and second heating device, and first heating device is arranged at the top of crystal growth container, and second heating device is arranged at the bottom of crystal growth container, and first heating device is electrically connected between second heating device;Seed heating component is arranged at the bottom of crystal growth container, and seed heating component is electrically connected with side top hammer by wire, and seed heating component top and seed bottom contact, and the utility model solves the problem that traditional heating power, top hammer temperature regulating changes temperature and gradient simultaneously.

Description

Technical Field

[0001] This utility model relates to the field of high-temperature-high-pressure diamond single crystal synthesis technology using a six-sided top press, and more specifically, to a synthesis block structure with a seed temperature adjustment function. Background Technology

[0002] In the field of growing synthetic diamond single crystals using a six-sided high-temperature-high-pressure equipment and a temperature gradient method, existing synthesis block structures rely on the main heating circuit (including top and bottom heating devices) combined with press heating power and top hammer temperature regulation for temperature control. However, the optimal growth temperature (e.g., 1430℃±10℃) and temperature gradient range for defect-free IIa diamond single crystals are extremely narrow. Furthermore, adjusting the heating power and top hammer temperature simultaneously alters the temperature and gradient within the entire synthesis chamber, making it difficult to simultaneously achieve optimal values ​​at the single crystal growth surface. This necessitates repeated trial-and-error adjustments to the synthesis block consumable parameters, resulting in low efficiency. Moreover, when growing ultra-large single crystals, the conversion of a large amount of graphite into diamond causes shrinkage in the crystal growth container and external components, leading to significant differences in the temperature field between the later and initial stages of growth. Existing adjustment methods are inadequate to adapt to this, making it difficult to maintain optimal growth conditions and affecting the quality and size of the single crystal. Utility Model Content

[0003] The purpose of this invention is to provide a synthetic block structure with seed temperature regulation function to improve the above-mentioned problems. To achieve the above objective, the technical solution adopted by this invention is as follows:

[0004] This application provides a synthetic block structure with seed temperature regulation function, including: a pyrophyllite powder block, a crystal growth container, a heating circuit, and a seed heating component. The pyrophyllite powder block includes a first pyrophyllite powder block and a second pyrophyllite powder block, which are stacked vertically. Each of the first and second pyrophyllite powder blocks has a cavity of the same diameter inside. The crystal growth container is disposed within the cavity. The heating circuit includes a first heating device and a second heating device. The first heating device is disposed at the top of the crystal growth container, and the second heating device is disposed at the bottom of the crystal growth container. The first and second heating devices are electrically connected. The seed heating component is disposed within the crystal growth container and is electrically connected to a side hammer via a wire. A seed crystal is disposed between the seed heating component and the crystal growth container, and the seed crystal is in contact with the top of the seed heating component. The seed heating component is insulated from the heating circuit.

[0005] Optionally, the second heating device includes a first graphite paper pad, a second graphite paper pad, a lower auxiliary heating element, and a lower conductive steel cap. The lower auxiliary heating element is disposed between the first graphite paper pad and the second graphite paper pad, and the bottom of the conductive steel cap is in contact with the second graphite paper pad.

[0006] Optionally, the first pyrophyllite powder block and the second pyrophyllite powder block have different heights. The bottom surface of the first pyrophyllite powder block is flush with the bottom surface of the lower cover of the crystal growth container, and the top surface of the second pyrophyllite powder block is flush with the side of the first graphite paper pad that is close to the seed crystal heating component.

[0007] Optionally, the crystal growth container includes a cylindrical tube, an upper cover, and a lower cover, wherein the upper cover, the lower cover, and the cylindrical tube together form a closed chamber.

[0008] Optionally, the lower cover includes a lower cover insulation ring and a lower cover lid. The lower cover insulation ring has the same outer diameter as the lower cover lid. A through hole is provided in the center of the lower cover insulation ring, and the seed crystal heating component is disposed on the top of the lower cover lid through the through hole.

[0009] Optionally, the crystal growth container is cylindrical, and a graphite heating tube is tightly wrapped around the outside of the crystal growth container.

[0010] Optionally, the seed crystal heating component includes an insulating thermally conductive pad, a heating element, a heat-insulating pad, and a conductive electrode. The heating element is disposed between the insulating thermally conductive pad and the heat-insulating pad, the conductive electrode is disposed on both side walls of the heating element, and the seed crystal is disposed on the top of the insulating thermally conductive pad.

[0011] Optionally, both sides of the insulation pad are provided with a first groove, the conductive electrode has a T-shaped cross-section, and the conductive electrode cooperates with the first groove provided on the side wall of the insulation pad.

[0012] Optionally, the bottom diameter of the graphite heating tube is provided with a second groove at each of the two ends opposite to each other, and the height and width of the second groove are the same as the height and width of the insulation-heat preservation sleeve wrapped around the conductor.

[0013] Optionally, the wire is strip-shaped.

[0014] The beneficial effects of this utility model are as follows:

[0015] This invention utilizes a cavity formed by separate first and second pyrophyllite powder blocks to accommodate a crystal growth container. Combined with a heating circuit consisting of a first heating device at the top and a second heating device at the bottom, it provides a stable high-temperature environment for crystal growth. Furthermore, a seed crystal heating component is located at the bottom of the crystal growth container, electrically connected to the top hammers on both sides via wires, allowing for independent adjustment of the seed crystal temperature. This structure not only meets the basic temperature control requirements for single crystal growth through the heating circuit but also addresses the problem of traditional methods where adjusting heating power and top hammer temperature simultaneously alters the internal temperature and temperature gradient of the entire crystal growth container. This makes it easier to match the optimal temperature and temperature gradient at different stages of single crystal growth, facilitating the growth of large-size, defect-free diamond single crystals. It also reduces the difficulty of manufacturing and assembling the synthetic block components.

[0016] Other features and advantages of this invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing embodiments of the invention. The objects and other advantages of this invention can be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the synthetic block structure with seed temperature regulation function as described in an embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of the seed crystal heating component.

[0020] Figure 3 This is a schematic diagram of the structure of the thermal insulation pad and the conductive electrode.

[0021] The markings in the diagram are as follows: 1. First pyrophyllite powder block; 2. Second pyrophyllite powder block; 3. Wire; 4. Seed crystal; 5. Seed crystal heating element; 6. First graphite paper pad; 7. Lower auxiliary heating element; 8. Second graphite paper pad; 9. Lower conductive steel cap; 10. Round tube; 11. Upper cover; 12. Lower cover; 13. Graphite heating tube; 14. Crystal bed; 15. Insulating thermally conductive pad; 16. Conductive electrode; 17. Thermal insulation pad; 18. Heating element; 19. First groove. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. The components of the embodiments of this utility model described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely to illustrate selected embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0023] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this utility model, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] like Figure 1As shown, this embodiment provides a synthetic block structure with seed temperature regulation function, including: pyrophyllite powder compact, crystal growth container, heating circuit, and seed heating component 5. The pyrophyllite powder compact includes a first pyrophyllite powder compact 1 and a second pyrophyllite powder compact 2, which are stacked vertically. The first pyrophyllite powder compact 1 and the second pyrophyllite powder compact 2 each have cavities of the same diameter inside. The crystal growth container is disposed within the cavity. The heating circuit includes a first heating device and a second heating device. The first heating device is disposed at the top of the crystal growth container, and the second heating device is disposed at the bottom of the crystal growth container. The first heating device and the second heating device are electrically connected. The seed heating component 5 is disposed inside the crystal growth container and is electrically connected to the side hammer via a wire 3. A seed 4 is disposed between the seed heating component 5 and the crystal growth container, and the seed 4 is in contact with the top of the seed heating component 5. The seed heating component 5 is insulated from the heating circuit. This structure is designed for use with a temperature gradient based on a six-sided high-temperature-high-pressure device. In the current method for growing synthetic diamond single crystals, existing technologies rely on heating power and top hammer temperature adjustment to simultaneously change the growth temperature and temperature gradient. This makes it difficult to simultaneously match the narrow optimal growth temperature range (e.g., 1430℃±10℃) and optimal temperature gradient range required for defect-free single crystals. Furthermore, the shrinkage of the container and external components during the growth of ultra-large single crystals can cause the temperature field to deviate significantly from the design conditions in the later stages of growth. To address this issue, a pyrophyllite powder compact containing first and second pyrophyllite powder compacts 2 (forming a cavity to accommodate the crystal growth container), a heating circuit containing a first top heating device and a second bottom heating device (providing a basic stable high temperature and temperature gradient), and a seed heating component 5 are set at the bottom of the crystal growth container. The seed heating component 5 is electrically connected to two oppositely arranged side top hammers via wires 3, thereby achieving independent control of the seed temperature 4. This assists the main heating adjustment method, enabling more precise matching of the optimal temperature and gradient at each stage of single crystal growth, thus solving the shortcomings of existing adjustment methods and meeting the growth requirements of large-size, defect-free diamond single crystals.

[0025] In one specific embodiment of this disclosure, the second heating device includes a first graphite paper pad 6, a second graphite paper pad 8, a lower auxiliary heating element 7, and a lower conductive steel cap 9. The lower auxiliary heating element 7 is disposed between the first graphite paper pad 6 and the second graphite paper pad 8. The bottom of the conductive steel cap is in contact with the second graphite paper pad 8. The only difference between the first heating device and the second heating device is the resistance setting; the other settings are the same and will not be described in detail here. The first heating device and the second heating device work together to provide continuous and uniform heating for the crystal growth container, ensuring the basic high-temperature environment required for single crystal growth.

[0026] In one specific embodiment of this disclosure, the first pyrophyllite powder block 1 and the second pyrophyllite powder block 2 have different heights. The bottom surface of the first pyrophyllite powder block 1 is flush with the bottom surface of the lower cover 12 of the crystal growth container, and the top surface of the second pyrophyllite powder block 2 is flush with the side of the first graphite paper pad 6 near the seed heating component 5. This utility model divides the pyrophyllite powder block into upper and lower parts to simplify the layout requirements of the wire 3 during the assembly of the composite block parts, and avoids installation misalignment or compression of the wire 3 during assembly, ensuring the connection stability of the wire 3 to achieve reliable power supply to the seed heating component. On the other hand, it avoids the complex drilling process required for the related composite block parts to pass through the wire 3 and its surrounding insulating jacket, ensuring precise matching between the pyrophyllite powder block and the crystal growth container, the first graphite paper pad 6 and other surrounding components, reducing the problem of heat preservation and pressure transmission effects caused by component size misalignment, thereby maintaining the stability of the surrounding environment of the crystal growth container and helping to ensure the temperature field and pressure conditions required for single crystal growth.

[0027] In one specific embodiment of this disclosure, the crystal growth container includes a circular tube 10, an upper cover 11, and a lower cover 12. The upper cover 11, the lower cover 12, and the circular tube 10 together form a closed chamber. The lower cover 12 includes a lower cover insulation ring and a lower cover lid. The lower cover insulation ring has the same outer diameter as the lower cover lid. A through hole is provided in the center of the lower cover insulation ring. The seed crystal heating component 5 is disposed on the top of the lower cover lid through the through hole. By specifying that the lower cover 12 has a through hole in its center and that the seed crystal heating component 5 is disposed inside the crystal bed through the through hole, this utility model ensures that the seed crystal heating component 5 can be accurately positioned on the crystal bed 1. The position of the seed crystal heating component 5 near the seed crystal 4 allows for efficient heat transfer to the seed crystal 4 via the insulating thermally conductive pad 15, ensuring the effectiveness of independent temperature adjustment of the seed crystal 4 and avoiding uneven temperature field caused by installation position deviation. On the other hand, the through-hole design provides a channel for the installation of the seed crystal heating component 5 while maintaining the sealed structure of the crystal growth container and reducing heat loss from the installation interface. This maintains the stability of the local temperature field around the crystal bed 14, thereby helping to ensure the temperature gradient conditions required for single crystal growth and providing structural support for achieving large-size, defect-free diamond single crystal growth.

[0028] In one specific embodiment of this disclosure, the crystal growth container is cylindrical, and a graphite heating tube 13 is tightly wrapped around the outer periphery of the crystal growth container. The graphite heating tube 13 can work in conjunction with the heating circuit, which provides the main heating function, providing the single crystal growth temperature and temperature gradient required for diamond single crystal growth to be close to the optimal conditions, and cooperates with the seed heating component 5 to independently adjust the temperature of the seed crystal 4, so that the optimal temperature and gradient range can be achieved in each stage of single crystal growth, while adapting to the temperature field changes caused by the shrinkage of the container volume during the growth of ultra-large single crystals.

[0029] like Figure 2As shown, in one specific embodiment of this disclosure, the seed crystal heating component 5 includes an insulating thermally conductive pad 15, a heating element 18, a heat insulation block 17, and a conductive electrode 16. The heating element 18 is disposed between the insulating thermally conductive pad 15 and the heat insulation block 17. The conductive electrode 16 is disposed on both side walls of the heating element 18. The seed crystal 4 is disposed on the top of the insulating thermally conductive pad 15. The insulating thermally conductive pad 15 can ensure efficient heat transfer from the heating element to the seed crystal 4 while preventing leakage. The heat insulation block 17 can reduce heat loss from the heating element downwards. The conductive electrode 16 ensures stable external current input to the heating element to achieve precise heating. All components work together to ensure the effectiveness and sealing of the heating of the seed crystal 4.

[0030] like Figure 3 As shown in a specific embodiment of this disclosure, the heat insulation pad 17 has a first groove 19 on both sides. The conductive electrode 16 has a T-shaped cross-section. The conductive electrode 16 and the first groove 19 on the side wall of the heat insulation pad 17 are matched. The matching structure of the T-shaped conductive electrode 16 and the first groove 19 can not only achieve stable assembly of the two and prevent the conductive electrode 16 from shifting during the assembly of the composite block or high-pressure growth, and ensure stable current input to the heating element to maintain the continuous heating of the seed crystal 4, but also allow the lower half of the conductive electrode 16 to be embedded in the heat insulation pad 17. By utilizing the insulation and heat preservation characteristics of the heat insulation pad 17, the heat loss of the conductive electrode 16 to the surrounding environment is reduced, and the heat dissipation of the conductive electrode 16 is prevented from causing a decrease in the heating efficiency of the seed crystal 4 or a disturbance in the temperature field around the crystal bed 14. This further improves the accuracy of temperature regulation of the seed crystal 4, helps to ensure the stable temperature field conditions required for single crystal growth, and adapts to the growth requirements of defect-free, large-size diamond single crystals.

[0031] In one specific embodiment of this disclosure, the bottom diameter of the graphite heating tube 13 is provided with a second groove at each of the two opposite ends. The height and width of the second groove are the same as the height and width of the insulation-heat insulation sleeve wrapped around the wire 3. The graphite heating tube 13 is made by rolling graphite paper. The second groove with the same outer size as the wire sleeve is processed at the bottom end of the graphite paper to provide a precise space for the wire 3 to be accommodated and positioned, ensuring that the wire 3 will not be offset or squeezed during the installation process, and avoiding the impact of improper wire position on the heating uniformity and structural stability of the graphite heating tube 13.

[0032] In one specific embodiment of this disclosure, the wire 3 is strip-shaped. The strip-shaped structure enables the wire 3 to form a larger and more closely fitting contact area with the side top hammer surface and the conductive electrode 16 of the seed heating component 5, effectively reducing the contact resistance at the two connection points, avoiding ineffective heating due to excessive contact resistance, preventing additional heating from interfering with the internal temperature field stability of the synthesis block, and ensuring that the seed heating component 5 obtains a stable current to achieve precise temperature control.

[0033] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0034] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0035] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

[0036] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A synthetic block structure with seed temperature regulation function, characterized in that: Pyrophyllite powder compact, the pyrophyllite powder compact includes a first pyrophyllite powder compact (1) and a second pyrophyllite powder compact (2), the first pyrophyllite powder compact (1) and the second pyrophyllite powder compact (2) are stacked vertically, and the first pyrophyllite powder compact (1) and the second pyrophyllite powder compact (2) are respectively provided with cavities of the same diameter inside. A crystal growth container, wherein the crystal growth container is disposed within the cavity; A heating circuit, comprising a first heating device and a second heating device, wherein the first heating device is disposed at the top of the crystal growth container and the second heating device is disposed at the bottom of the crystal growth container, and the first heating device and the second heating device are electrically connected. A seed heating component (5) is disposed inside the crystal growth container. The seed heating component (5) is electrically connected to the side top hammer through a wire (3). A seed (4) is disposed between the seed heating component (5) and the crystal growth container. The seed (4) is in contact with the top of the seed heating component (5). The seed heating component (5) is insulated from the heating circuit.

2. The synthetic block structure with seed temperature regulation function according to claim 1, characterized in that: The second heating device includes a first graphite paper pad (6), a second graphite paper pad (8), a lower auxiliary heating element (7), and a lower conductive steel cap (9). The lower auxiliary heating element (7) is disposed between the first graphite paper pad (6) and the second graphite paper pad (8), and the bottom of the conductive steel cap is in contact with the second graphite paper pad (8).

3. The synthetic block structure with seed temperature regulation function according to claim 2, characterized in that: The first pyrophyllite powder block (1) and the second pyrophyllite powder block (2) have different heights. The bottom surface of the first pyrophyllite powder block (1) is flush with the bottom surface of the lower cover (12) of the crystal growth container, and the top surface of the second pyrophyllite powder block (2) is flush with the side of the first graphite paper pad (6) that is close to the seed heating component (5).

4. The synthetic block structure with seed temperature regulation function according to claim 1, characterized in that: The crystal growth container includes a cylindrical tube (10), an upper cover (11), and a lower cover (12), which together form a closed chamber.

5. The synthetic block structure with seed temperature regulation function according to claim 4, characterized in that: The lower cover (12) includes a lower cover heat preservation ring and a lower cover cover. The lower cover heat preservation ring has the same outer diameter as the lower cover cover. A through hole is provided in the center of the lower cover heat preservation ring. The seed heating component (5) is disposed on the top of the lower cover cover through the through hole.

6. The synthetic block structure with seed temperature regulation function according to claim 1, characterized in that: The crystal growth container is cylindrical, and a graphite heating tube (13) is tightly wrapped around the outside of the crystal growth container.

7. The synthetic block structure with seed temperature regulation function according to claim 1, characterized in that: The seed heating component (5) includes an insulating thermally conductive pad (15), a heating element (18), a heat insulation block (17), and a conductive electrode (16). The heating element (18) is disposed between the insulating thermally conductive pad (15) and the heat insulation block (17). The conductive electrode (16) is disposed on both sides of the heating element (18). The seed crystal (4) is disposed on the top of the insulating thermally conductive pad (15).

8. The synthetic block structure with seed temperature regulation function according to claim 7, characterized in that: The heat insulation pad (17) has a first groove (19) on both sides. The conductive electrode (16) has a T-shaped cross section and the conductive electrode (16) cooperates with the first groove (19) on the side wall of the heat insulation pad (17).

9. The synthetic block structure with seed temperature regulation function according to claim 6, characterized in that: The graphite heating tube (13) has a second groove at each end of its bottom diameter. The height and width of the second groove are the same as the height and width of the insulation-heat insulation sleeve wrapped around the conductor (3).

10. The synthetic block structure with seed temperature regulation function according to claim 1, characterized in that: The conductor (3) is strip-shaped.

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