Temperature difference control system for cultivating diamonds

Abstract

The invention relates to the technical field of artificial diamond cultivation through an HTHP temperature difference method, in particular to a temperature difference control system for diamond cultivation, which comprises two groups of cooling ponds and temperature control units, and cooling units are arranged in the two groups of cooling ponds; the temperature control unit is respectively connected with the two groups of cooling units, the temperature control unit senses and controls the temperature of the upper hammer cooling water and the temperature of the lower hammer cooling water, and in the cooling process, the temperature of the upper hammer cooling water and the temperature of the lower hammer cooling water are set to be 10-45 DEG C; the temperature control unit controls the temperature of the upper hammer cooling water and the lower hammer cooling water when the upper hammer cooling water and the lower hammer cooling water enter the cultivation device, so that a temperature difference exists between the upper hammer cooling water and the lower hammer cooling water, the temperature difference is linearly increased along with the cultivation time step, and the temperature difference is set to be 0-15 DEG C. By controlling the temperature of the cooling water in different diamond cultivation time periods, a reasonable temperature difference is formed between the upper end and the lower end of the cultivation device, the diamond is always in the optimal temperature difference state in the growth process, and the quality, the yield and the production efficiency of the initial diamond blank are stably improved.

Description

Technical Field

[0001] The present application relates to the technical field of artificially grown diamonds using the HTHP temperature difference method, and in particular to a temperature difference control system for growing diamonds. Background Art

[0002] The manufacturing principle of high temperature and high pressure cultured diamond is to use the design of the cavity structure and the design of the insulation material to form a temperature difference between the upper and lower parts. This difference, under the action of the catalyst, causes carbon atoms to migrate from the high temperature part to the low temperature part, and finally crystallize into diamond form on the surface of the crystal seed. As time goes by, the crystal grows into a diamond rough.

[0003] For a long time, people have conducted a lot of research and optimization on structural design and material design, and have achieved many results. However, the scheme to improve the temperature difference from the aspects of structural design and material design has reached the extreme, and the temperature difference cannot be accurately controlled by adjusting the structure and materials.

[0004] For example, in the related art, CN116555908A discloses a "Double-layer heating tube device for adjusting the temperature gradient of synthetic cultured diamonds". The device mainly includes a main heating tube and an auxiliary heating tube. The temperature difference is adjusted by adjusting the position of the auxiliary heating tube.

[0005] Theoretically, the temperature difference generated by the heating device during synthetic cultured diamonds should be within the range of 15-20°C, which means that as long as this condition is met, the purpose of growing diamonds can be achieved by any means. However, the diamond cultivation process is a delicate and complex process, and the requirements for temperature difference are different in different time periods. Once the structure and materials of the above-mentioned device are determined, the temperature difference distribution is determined. At this time, it is impossible to change the temperature difference in different time periods during the synthesis process to adapt to the growth of diamonds.

[0006] In view of this, there is an urgent need to provide a temperature difference control system that can provide a temperature difference range that meets the requirements on the basis of improved structure and materials, and the formed temperature difference can be adaptively adjusted in different time periods, so that the diamond growth process is always in the optimal temperature difference state. Summary of the invention

[0007] The present application provides a temperature difference control system for cultured diamonds, which can realize linear control of temperature in different time periods of diamond cultivation, so as to set a reasonable temperature difference in different cultivation time periods, so that the diamond growth process is always in an optimal temperature difference state, so that the quality, yield and production efficiency of diamond embryos can be stably improved.

[0008] The temperature difference control system for cultured diamonds provided in this application adopts the following technical solution:

[0009] A temperature difference control system for cultivating diamonds, comprising:

[0010] There are two groups of cooling pools, one group of cooling pools is used to cool the upper hammer cooling water, and the other group of cooling pools is used to cool the lower hammer cooling water. Both groups of cooling pools are provided with cooling units;

[0011] A temperature control unit is connected to the two groups of cooling units respectively, and the temperature control unit senses the temperature of the upper hammer cooling water and the lower hammer cooling water, and controls the temperature of the upper hammer cooling water and the lower hammer cooling water through the cooling unit;

[0012] During the cooling process, the temperatures of the upper hammer cooling water and the lower hammer cooling water are set to 10-45°C; the temperature control unit controls the temperature of the upper hammer cooling water and the lower hammer cooling water when they enter the cultivation device, so that there is a temperature difference between the upper hammer cooling water and the lower hammer cooling water, and the temperature difference increases linearly with the cultivation time step, and the temperature difference is set to 0-15°C.

[0013] Furthermore, the substrate enters the first stage, the second stage, the third stage, the fourth stage and the fifth stage in sequence during the incubation time;

[0014] Among them, in the first stage, the temperature difference is set to 0-1°C, in the second stage, the temperature difference is set to 1-2°C, in the third stage, the temperature difference is set to 2-4°C, in the third stage, the temperature difference is set to 4-6°C, and in the fourth stage, the temperature difference is set to 6-10°C.

[0015] Furthermore, the incubation time is set to 185 to 195 hours.

[0016] Furthermore, the temperature of the upper hammer cooling water and the lower hammer cooling water is controlled to keep the temperature of the upper hammer cooling water constant and to reduce the temperature of the lower hammer cooling water linearly.

[0017] Furthermore, the temperature of the upper hammer cooling water is set to any value between 35 and 45°C, and the temperature of the lower hammer cooling water is set to 25 to 40°C.

[0018] Furthermore, the temperature of the upper hammer cooling water and the lower hammer cooling water is controlled to keep the temperature of the lower hammer cooling water constant and to increase the temperature of the upper hammer cooling water linearly.

[0019] Furthermore, the temperature of the lower hammer cooling water is set to any value between 30 and 40°C, and the temperature of the upper hammer cooling water is set to 35 to 45°C.

[0020] Furthermore, the temperature of the upper hammer cooling water and the lower hammer cooling water is controlled to be set to linearly reduce the temperature of the lower hammer cooling water and linearly increase the temperature of the upper hammer cooling water.

[0021] Furthermore, the temperature of the upper hammer cooling water is set to 30-45°C, and the temperature of the lower hammer cooling water is set to 25-40°C.

[0022] In summary, the present application includes at least one of the following beneficial technical effects:

[0023] 1. This application divides the cultivation time and finely controls the temperature of the upper hammer cooling water and the lower hammer cooling water in different time periods, thereby adjusting the temperature difference between the upper and lower ends of the cultivation device, and realizing linear controllable temperature difference in different time periods. That is, according to the growth requirements of different time periods, a reasonable temperature difference is set, so that the diamond growth process is always in the best temperature difference state, and the quality and yield of diamond embryos are improved.

[0024] 2. In the present application, the temperature difference between the cooling water of the upper hammer and the cooling water of the lower hammer is increased linearly in steps to ensure that the substrate has a high purity when forming a crystal seed. As time goes by, the crystal seed begins to grow to form a diamond embryo. The diamond embryo grows bigger and bigger, and the area that can accept the C element is getting bigger and bigger. Correspondingly, the size of the temperature difference and the growth rate are also matched and increased. While ensuring the improvement of the quality and output of the diamond blanks, the diamond cultivation efficiency is also improved.

[0025] 3. In this application, adjusting the temperature of the upper hammer cooling water and the lower hammer cooling water plays a major role in forming a temperature difference between the upper and lower parts of the cultivation device, reducing the requirements on the structure and materials of the cultivation device. At the same time, it also greatly reduces the dependence on the stability of the substrate, and the production stability is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the temperature difference control system in this application;

[0027] Figure 2 This is a flow chart for controlling the cooling water of the upper hammer and the lower hammer in this application;

[0028] Figure 3 This is a temperature variation diagram of the upper hammer cooling water and the lower hammer cooling water in Example 1 of the present application;

[0029] Figure 4 This is a temperature variation diagram of the upper hammer cooling water and the lower hammer cooling water in Example 2 of the present application;

[0030] Figure 5 This is a temperature variation diagram of the upper hammer cooling water and the lower hammer cooling water in Example 3 of the present application;

[0031] 1. Cooling pool; 2. Cooling unit; 3. Temperature control unit; 31. Sensor; 32. Controller. DETAILED DESCRIPTION

[0032] The following will be combined with the attached Figure 1-5 The technical solution of the present application is described clearly and completely. The following embodiments are exemplary and are only used to explain the present application, and cannot be interpreted as limiting the present application. In the following description, the same symbols are used to represent the same or equivalent elements, and repeated descriptions are omitted.

[0033] In the description of the present application, it should be understood that the terms "upper", "lower", "inside", "outside", "left", "right", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the products of the present application are conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0034] In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0035] It should be further understood that the term “and / or” used in the specification and corresponding claims of this application refers to any and all possible combinations of one or more of the listed items.

[0036] A temperature difference control system for growing diamonds, referring to Figure 1 and Figure 2 , including cooling pool 1, cooling pool 1 is provided with two groups, among which, one group of cooling pool 1 is used to store upper hammer cooling water, and the other group of cooling pool 1 is used to store lower hammer cooling water, the temperature of upper hammer cooling water and lower hammer cooling water are both set to 10-45°C, the upper hammer cooling water / lower hammer cooling water circulates between the cultivation device and the corresponding cooling pool 1, and the temperature of the upper hammer and the lower hammer of the cultivation device is adjusted by heat exchange to form a temperature difference.

[0037] The upper hammer cooling water and the lower hammer cooling water will absorb part of the heat of the cultivation device. Due to the different temperatures of the upper hammer cooling water and the lower hammer cooling water, there is a difference in the heat absorption capacity between the upper hammer cooling water and the lower hammer cooling water. That is, by controlling the temperature difference between the upper hammer cooling water and the lower hammer cooling water, the temperature control effect on the upper hammer and the lower hammer of the cultivation device can be accurately adjusted. The difference in temperature control effect can realize the controllable temperature difference between the upper hammer and the lower hammer of the cultivation device, thereby providing a suitable temperature for the cultivation of diamonds.

[0038] During the process of the upper hammer cooling water and the lower hammer cooling water cooling the cultivation device, the temperature of the upper hammer cooling water and the lower hammer cooling water when they enter the cultivation device is controlled so that there is a temperature difference between the upper hammer cooling water and the lower hammer cooling water. The temperature difference increases linearly with the cultivation time, and the temperature difference is set to 0-15°C.

[0039] Correspondingly, the temperature difference control system also includes a cooling unit 2 and a temperature control unit 3. There are two groups of cooling units 2, which are arranged one by one with the two groups of cooling pools 1, that is, one group of cooling units 2 is used to cool the upper hammer cooling water, and the other group of cooling units 2 is used to cool the lower hammer cooling water, so as to ensure that the temperature of the upper hammer cooling water and the lower hammer cooling water is always within the range of 10 to 45°C, so as to facilitate the regulation of the temperature difference between the upper hammer and the lower hammer of the cultivation device.

[0040] The cooling unit 2 can be specifically configured according to actual conditions. In a specific embodiment, the cooling unit 2 can be configured as a water chiller, and in another specific embodiment, it can also be configured as other suitable forms to ensure that the upper hammer cooling water and the lower hammer cooling water can be cooled.

[0041] Furthermore, the temperature control unit 3 is used to sense the temperature of the upper hammer cooling water and the lower hammer cooling water, and control the temperature of the upper hammer cooling water and the lower hammer cooling water by controlling the operating state of the cooling unit 2.

[0042] Specifically, the temperature control unit 3 includes a controller 32 and two groups of sensors 31, both groups of sensors 31 are connected to the input end of the controller 32, and both groups of cooling units 2 are connected to the output end of the controller 32. One group of sensors 31 is placed in the cooling pool 1 for storing the upper hammer cooling water to sense the temperature of the upper hammer cooling water, and the other group of sensors 31 is placed in the cooling pool 1 for storing the lower hammer cooling water to sense the temperature of the lower hammer cooling water.

[0043] The two groups of sensors 31 transmit the temperatures of the upper hammer cooling water and the lower hammer cooling water to the controller 32 respectively. The controller 32 controls the power of the cooling unit 2 according to the real-time temperatures of the upper hammer cooling water and the lower hammer cooling water, so that the upper hammer cooling water and the lower hammer cooling water re-enter the cultivation device at a preset temperature for circulating heat exchange.

[0044] Furthermore, the substrate enters the first stage, the second stage, the third stage, the fourth stage and the fifth stage in sequence during the incubation time, and the temperature difference between the upper hammer cooling water and the lower hammer cooling water increases linearly in steps as entering different time periods.

[0045] By dividing the cultivation time and finely controlling the temperature of the upper hammer cooling water and the lower hammer cooling water in different time periods, the temperature difference between the upper and lower ends of the cultivation device is regulated, and the linear control of the temperature difference in different time periods is achieved. That is, according to the growth requirements of different time periods, a reasonable temperature difference is set to keep the diamond growth process in the best temperature difference state.

[0046] This ensures that the substrate has a high degree of purity when forming a crystal seed. As time goes by, the crystal seed begins to grow to form a diamond embryo. The longer the diamond embryo grows, the larger the area that can accept the C element becomes. Correspondingly, the size of the temperature difference and the growth rate of the temperature difference also increase in a matching manner to improve the efficiency of diamond cultivation. The final diamond embryo has a higher quality and yield.

[0047] Specifically, the temperature difference between the upper hammer cooling water and the lower hammer cooling water is set as follows to meet the temperature difference requirements in the upper hammer and lower hammer directions of the cultivation device.

[0048] Among them, in the first stage, the temperature difference is set to 0-1°C, in the second stage, the temperature difference is set to 1-2°C, in the third stage, the temperature difference is set to 2-4°C, in the fourth stage, the temperature difference is set to 4-6°C, and in the fifth stage, the temperature difference is set to 6-10°C.

[0049] Furthermore, the cultivation time is set to 185 to 195 hours. The cultivation time is specifically set according to the actual situation (the size of the inner cavity of the cultivation device, the temperature and pressure provided by the cultivation device). In a specific embodiment, the cultivation time of the diamond embryo is set to 190 hours.

[0050] Furthermore, in a specific embodiment, the temperature of the upper hammer cooling water remains unchanged, and the temperature of the lower hammer cooling water decreases linearly to form a temperature difference. The temperature of the upper hammer cooling water is set to any value between 35 and 45°C, and the temperature of the lower hammer cooling water is set to 25 to 40°C.

[0051] Specifically, refer to Figure 3 In a specific embodiment, the temperature of the upper hammer cooling water is set to 38°C. In the first stage, the lower hammer cooling water is linearly reduced from 38°C to 37°C; in the second stage, the lower hammer cooling water is linearly reduced from 37°C to 36°C; in the third stage, the lower hammer cooling water is linearly reduced from 36°C to 34°C; in the fourth stage, the lower hammer cooling water is linearly reduced from 34°C to 32°C; in the fifth stage, the lower hammer cooling water is linearly reduced from 32°C to 28°C.

[0052] Embodiment 2:

[0053] Reference Figure 4The difference between Example 2 and Example 1 is that the temperature of the upper hammer cooling water and the lower hammer cooling water is controlled to be set as follows: the temperature of the lower hammer cooling water remains unchanged and the temperature of the upper hammer cooling water increases linearly.

[0054] The temperature of the cooling water for the lower hammer is set to any value between 30 and 40°C, and the temperature of the cooling water for the upper hammer is set to 30 to 45°C.

[0055] Specifically, in a specific embodiment, the temperature of the lower hammer cooling water is set to 32°C. In the first stage, the upper hammer cooling water is linearly increased from 32°C to 33°C; in the second stage, the upper hammer cooling water is linearly increased from 33°C to 34°C; in the third stage, the upper hammer cooling water is linearly increased from 34°C to 36°C; in the fourth stage, the upper hammer cooling water is linearly reduced from 36°C to 38°C; in the fifth stage, the upper hammer cooling water is linearly reduced from 38°C to 42°C.

[0056] Embodiment 3:

[0057] Reference Figure 5 The difference between this embodiment 2 and embodiment 1 is that the temperature of the upper hammer cooling water and the lower hammer cooling water is set to: the temperature of the lower hammer cooling water is linearly reduced, and the temperature of the upper hammer cooling water is linearly increased.

[0058] Among them, the temperature of the upper hammer cooling water is set to 30-45°C, and the temperature of the lower hammer cooling water is set to 25-40°C.

[0059] Specifically, in a specific embodiment, in the first stage, the upper hammer cooling water is linearly increased from 31°C to 31.5°C, and the lower hammer cooling water is linearly decreased from 31°C to 30.5°C; in the second stage, the upper hammer cooling water is linearly increased from 31.5°C to 32°C, and the lower hammer cooling water is linearly decreased from 30.5°C to 30°C; in the third stage, the upper hammer cooling water is linearly increased from 32°C to 33°C, and the lower hammer cooling water is linearly decreased from 30°C to 29°C; in the fourth stage, the upper hammer cooling water is linearly increased from 32°C to 33°C, and the lower hammer cooling water is linearly decreased from 29°C to 28°C; in the fifth stage, the upper hammer cooling water is linearly increased from 33°C to 35°C, and the lower hammer cooling water is linearly decreased from 28°C to 26°C.

[0060] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A temperature difference control system for cultured diamonds, characterized in that: include: There are two groups of cooling pools, one group of cooling pools is used to cool the upper hammer cooling water, and the other group of cooling pools is used to cool the lower hammer cooling water. Both groups of cooling pools are provided with cooling units; A temperature control unit is connected to the two groups of cooling units respectively, and the temperature control unit senses the temperature of the upper hammer cooling water and the lower hammer cooling water, and controls the temperature of the upper hammer cooling water and the lower hammer cooling water through the cooling unit; During the cooling process, the temperatures of the upper hammer cooling water and the lower hammer cooling water are set to 10-45°C; the temperature control unit controls the temperature of the upper hammer cooling water and the lower hammer cooling water when they enter the cultivation device, so that there is a temperature difference between the upper hammer cooling water and the lower hammer cooling water, and the temperature difference increases linearly with the cultivation time step, and the temperature difference is set to 0-15°C.

2. A temperature difference control system for cultured diamonds according to claim 1, characterized in that: The substrate enters the first stage, the second stage, the third stage, the fourth stage and the fifth stage in sequence during the incubation time; Among them, in the first stage, the temperature difference is set to 0-1°C, in the second stage, the temperature difference is set to 1-2°C, in the third stage, the temperature difference is set to 2-4°C, in the third stage, the temperature difference is set to 4-6°C, and in the fourth stage, the temperature difference is set to 6-10°C.

3. A temperature difference control system for cultured diamonds according to claim 2, characterized in that: The incubation time is set to 185 to 195 hours.

4. The temperature difference control system for cultured diamonds according to claim 2, characterized in that: The temperature of the upper hammer cooling water and the lower hammer cooling water is controlled to be set to keep the temperature of the upper hammer cooling water constant and reduce the temperature of the lower hammer cooling water linearly.

5. The temperature difference control system for cultured diamonds according to claim 4, characterized in that: The temperature of the upper hammer cooling water is set to any value between 35 and 45°C, and the temperature of the lower hammer cooling water is set to 25 to 40°C.

6. The temperature difference control system for cultured diamonds according to claim 2, characterized in that: The temperature of the upper hammer cooling water and the lower hammer cooling water is controlled to be set to keep the temperature of the lower hammer cooling water constant and increase the temperature of the upper hammer cooling water linearly.

7. The temperature difference control system for cultured diamonds according to claim 6, characterized in that: The temperature of the lower hammer cooling water is set to any value between 30 and 40°C, and the temperature of the upper hammer cooling water is set to 35 to 45°C.

8. The temperature difference control system for cultured diamonds according to claim 2, characterized in that: The temperature of the upper hammer cooling water and the lower hammer cooling water is controlled to be set to: the temperature of the lower hammer cooling water is linearly reduced, and the temperature of the upper hammer cooling water is linearly increased.

9. The temperature difference control system for cultured diamonds according to claim 8, characterized in that: The temperature of the upper hammer cooling water is set to 30-45°C, and the temperature of the lower hammer cooling water is set to 25-40°C.

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