Synthesis device for preparing diamond from graphite

Abstract

The utility model provides a synthesis device for preparing diamond from graphite. The synthesis device comprises an alloy circular tube for filling materials, the pressure transmitting and heat preserving layer is used for transmitting pressure and preserving heat; the pyrophyllite block is used for transmitting pressure, a round through hole is formed in the pyrophyllite block, an alloy round pipe is arranged in the round through hole, a pressure transmitting heat preservation layer is arranged between the alloy round pipe and the pyrophyllite block, and conductive plugs are arranged at the two ends of the round through hole of the pyrophyllite block; the alloy circular tube comprises an upper alloy circular tube and a lower alloy circular tube which are used for containing materials, one end of each of the upper alloy circular tube and the lower alloy circular tube is sealed, and the other end is opened; graphite cylinder clamping seats for mounting graphite cylinders are arranged in the upper alloy circular tube and the lower alloy circular tube. The heat sources are arranged inside and outside the alloy circular tube, so that the synthesis cavity is uniformly heated, materials are all in the metal circular tube, the risk that the materials are polluted is reduced, and the quality of synthesized diamond is improved.

Description

Technical Field

[0001] The present application relates to the technical field of diamond synthesis, and more specifically, to a device for synthesizing diamond from graphite. Background Art

[0002] With the development of geological exploration, oil extraction, mechanical processing and other industries, artificial diamond drill bits, saw blades, rollers and other tools have been widely used, and artificial diamonds are also developing in the direction of increasing particle size and improving quality. High-quality diamond single crystals have the characteristics of coarse particles and high strength because of the high hardness and good wear resistance of diamonds. However, the cost of using naturally excavated diamonds is high and production is limited. The core of the silicon carbide smelting furnace is graphite. After multiple smeltings of silicon carbide, the core is scrapped and can no longer be used as a resistance furnace for silicon carbide smelting furnace. In order to realize the utilization of the core, the core is prepared into diamond.

[0003] Diamonds are mainly produced by the static pressure catalytic method using a six-sided top press and a pyrophyllite synthesis chamber. The pyrophyllite synthesis block needs to be kept under stable pressure and temperature conditions to ensure the quality of diamond synthesis. However, the temperature of the heated part inside the diamond synthesis chamber is uneven, the pressure is uneven, and the stability is poor, resulting in a low diamond synthesis rate and low quality. Utility Model Content

[0004] The utility model provides a graphite diamond synthesis device, which solves the problems of uneven temperature and poor stability of the heated part inside the diamond synthesis cavity by heating the inside and outside of the synthesis cavity at the same time.

[0005] The utility model is realized through the following technical solutions.

[0006] A graphite preparation diamond synthesis device comprises: an alloy circular tube for filling materials; a pressure transmission and heat insulation layer for conducting pressure and heat preservation; a pyrophyllite block for transmitting pressure, a circular through hole is opened inside the pyrophyllite block, an alloy circular tube is arranged in the circular through hole, a pressure transmission and heat insulation layer is arranged between the alloy circular tube and the pyrophyllite block, and conductive plugs are arranged at both ends of the circular through hole of the pyrophyllite block; the alloy circular tube comprises: an upper alloy circular tube and a lower alloy circular tube for filling materials, the upper alloy circular tube and the lower alloy circular tube are both sealed at one end and open at the other end; a graphite cylinder holder for mounting a graphite cylinder is arranged in the upper alloy circular tube and the lower alloy circular tube.

[0007] By arranging graphite cylinders between metal round tubes, the inside of the synthesis cavity can also be heated to make the heating temperature in the synthesis cavity uniform.

[0008] In a further technical solution, in order to solve the problem of uneven pressure in the synthesis cavity, a pressure boosting block is provided on the outside of the phyllite block.

[0009] The pressure inside the synthesis cavity is made uniform by pyrophyllite and the pressure-boosting block.

[0010] Preferably, in order to keep the external heat of the alloy round tube stable, a graphite sheet layer is provided between the conductive plug and the alloy round tube.

[0011] Preferably, in order to improve the sealing performance and pressure uniformity in the synthesis cavity, a pyrophyllite ring is provided on the outside of the graphite sheet.

[0012] Furthermore, in order to improve the synthesis efficiency, the catalyst and the graphite layer are vertically arranged in sequence inside the alloy round tube.

[0013] Furthermore, in order to make the synthesis cavity heated evenly, heat conducting sheets are provided on the inner sides of the upper alloy round tube and the lower alloy round tube.

[0014] The technical effects of the utility model are:

[0015] The present application arranges heat sources inside and outside the alloy circular tube to ensure uniform heating in the synthesis cavity, and the materials are all in the metal circular tube, thereby reducing the risk of material contamination and improving the quality of synthetic diamonds. The pressure inside the synthesis cavity is made uniform by a booster block, and graphite layers and catalysts are arranged in sequence to increase the diamond generation rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the utility model;

[0017] In the figure: alloy round tube 1; upper alloy round tube 101; lower alloy round tube 102; graphite cylinder 103; graphite cylinder holder 104; pressure transmission and heat insulation layer 3; pressure transmission component 4; pyrophyllite block 401; booster block 402; graphite sheet layer 5; pyrophyllite ring 6; catalyst 7; graphite layer 8; conductive plug 9; thermal conductive sheet 10. DETAILED DESCRIPTION

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0019] Example 1

[0020] Combination Figure 1The utility model discloses a graphite preparation diamond synthesis device, comprising: an alloy round tube 1 for filling materials; a pressure transmission and heat insulation layer 3 for conducting pressure and heat preservation; a pyrophyllite block 11 for transmitting pressure, a circular through hole is provided inside the pyrophyllite block 11, an alloy round tube 1 is arranged in the circular through hole, a pressure transmission and heat insulation layer 3 is arranged between the alloy round tube 1 and the pyrophyllite block 11, and conductive plugs 9 are arranged at both ends of the circular through hole of the pyrophyllite block 11; the alloy round tube 1 comprises: an upper alloy round tube 101 for filling materials And the lower alloy circular tube 102, the upper alloy circular tube 101 and the lower alloy circular tube 102 are both sealed at one end and open at the other end; a graphite cylinder holder 104 for mounting the graphite cylinder 103 is arranged in the upper alloy circular tube 101 and the lower alloy circular tube 102, a booster block 402 is arranged on the outside of the phyllite block 11, a graphite sheet layer 5 is arranged between the conductive plug 9 and the alloy circular tube 1, a phyllite ring 6 is arranged on the outside of the graphite sheet layer 5, and a heat conducting plate 10 is arranged on the inside of the upper alloy circular tube 101 and the lower alloy circular tube 102.

[0021] During the implementation process, the material is loaded into the alloy circular tube 1, which can effectively prevent the internal material from being contaminated and improve the strength of the synthetic diamond. The alloy circular tube 1 is placed above the graphite sheet 5, and the conductive plug 9 is energized to conduct electricity to the graphite sheet 5. The graphite sheet 5 will release heat when it is energized. There is a phyllite ring 6 on the outside of the graphite sheet 5 to make the sealing of the synthesis device better, reduce heat dissipation, and stabilize the temperature in the synthesis cavity. The graphite sheet 5 will conduct electricity to the alloy circular tube 1, and the alloy circular tube 1 will generate heat when it is energized, which ensures the stability of the external temperature of the alloy circular tube 1. A heat conducting sheet 10 is provided on the inner side of the upper alloy circular tube 101 and the lower alloy circular tube 102, which can make the external temperature more stable. The good conduction is to the material inside the alloy circular tube 1, a graphite cylinder 103 is arranged between the upper alloy circular tube 101 and the lower alloy circular tube 102, the alloy circular tube 1 conducts electricity to the graphite cylinder 103, the graphite cylinder 103 will release heat when electrified, and provide temperature to the center of the material inside the alloy circular tube 1, so that the material is heated evenly, the alloy circular tube 1 is provided with a pressure transmission and heat preservation layer 3 on the outside of the conductive layer 2, so that the pressure conduction is uniform and the temperature loss is reduced, the outside of the pressure transmission and heat preservation layer 3 is a phyllite block 11, and the outside of the phyllite block 11 is a booster block, so that the pressure in the synthesis cavity is uniform, after the synthesis is completed, the synthesis device is removed from the six-sided top press, and the synthesized diamond can be obtained from the alloy circular tube 1.

[0022] Example 2

[0023] On the basis of Example 1, the catalyst 7 and the graphite layer 8 are vertically arranged in sequence inside the alloy round tube 1.

[0024] During the implementation process, the catalyst 7 and the graphite layer 8 are arranged vertically in sequence inside the alloy tube 1 so that the graphite can be heated evenly and the rate of generating diamond can be increased.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. A graphite diamond synthesis device, characterized in that: include: An alloy circular tube (1) for filling materials; a pressure transmission and heat insulation layer (3) for conducting pressure and heat preservation; a phyllite block (11) for transmitting pressure, wherein a circular through hole is provided inside the phyllite block (11), the alloy circular tube (1) is arranged inside the circular through hole, a pressure transmission and heat insulation layer (3) is arranged between the alloy circular tube (1) and the phyllite block (11), and conductive plugs (9) are arranged at both ends of the circular through hole of the phyllite block (11); the alloy circular tube (1) comprises: an upper alloy circular tube (101) and a lower alloy circular tube (102) for filling materials, wherein the upper alloy circular tube (101) and the lower alloy circular tube (102) are both sealed at one end and open at the other end; and graphite cylindrical holders (104) for mounting graphite cylindrical holders (103) are arranged inside the upper alloy circular tube (101) and the lower alloy circular tube (102).

2. The graphite preparation diamond synthesis device according to claim 1, characterized in that: A pressure boosting block (4) is arranged outside the pyrophyllite block (11).

3. The graphite preparation diamond synthesis device according to claim 1, characterized in that: A graphite sheet layer (5) is provided between the conductive plug (9) and the alloy round tube (1).

4. The graphite-to-diamond synthesis device according to claim 3, characterized in that: A pyrophyllite ring (6) is provided on the outside of the graphite sheet (5).

5. The graphite-to-diamond synthesis device according to claim 1, characterized in that: A catalyst (7) and a graphite layer (8) are arranged vertically in sequence inside the alloy circular tube (1).

6. The graphite-to-diamond synthesis device according to claim 1, characterized in that: Heat conducting sheets (10) are provided inside the upper alloy round tube (101) and the lower alloy round tube (102).

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