An assembly structure of a polycrystalline diamond compact

Abstract

This utility model relates to the field of polycrystalline diamond, specifically an assembly structure for a polycrystalline diamond synthesis block, comprising pyrophyllite, wherein a graphite cylinder is enclosed within the inner cavity of the pyrophyllite, and a graphite core is disposed within the inner cavity of the graphite cylinder. This utility model utilizes a heating element disposed inside the graphite cylinder, allowing heat to be conducted both internally and externally simultaneously. By incorporating a first insulating tube and a second insulating tube, the heating element is separated, ensuring stable operation at high temperatures. This improves the overall insulation performance and thermal conductivity. It solves the problem that placing the heating element on the outermost side of the graphite core column, due to the low thermal conductivity of dolomite and iron, leads to decreased heat transfer efficiency, potentially causing the internal temperature of the graphite core column to fall below the required synthesis threshold, resulting in overheating on the outside and excessively low internal temperature, thus affecting the polycrystalline diamond synthesis efficiency.

Description

Technical Field

[0001] This utility model relates to the field of polycrystalline diamond, specifically an assembly structure for a polycrystalline diamond composite block. Background Technology

[0002] Polycrystalline diamond is a three-dimensional network structure material formed by numerous nano-sized microcrystals bonded together by unsaturated bonds. It has self-sharpening properties, high toughness, and excellent thermal conductivity, and is widely used in precision machining, semiconductor heat dissipation, and special tool manufacturing.

[0003] The synthesis of polycrystalline diamond requires a specific high-temperature and high-pressure environment. To achieve a balanced and stable high-temperature and high-pressure environment, the existing polycrystalline diamond synthesis block consists of a graphite core, two iron cups, two dolomite insulating cups, and a heating element, from the inside out. However, placing the heating element on the outermost side of the graphite core can lead to a decrease in heat transfer efficiency due to the low thermal conductivity of dolomite and iron. The internal temperature of the graphite core may fall below the required synthesis threshold, resulting in overheating on the outside and underheating on the inside, which affects the synthesis efficiency of polycrystalline diamond. Utility Model Content

[0004] To overcome the shortcomings of existing technologies, the heating element is placed on the outermost side of the graphite core. However, due to the low thermal conductivity of dolomite and iron, the heat transfer efficiency will decrease, and the internal temperature of the graphite core may be lower than the threshold required for synthesis. This will result in overheating on the outside of the graphite core and excessively low internal temperature, affecting the synthesis efficiency of polycrystalline diamond. This invention proposes an assembly structure for polycrystalline diamond synthesis blocks.

[0005] The technical solution adopted by this utility model to solve its technical problem is: an assembly structure of a polycrystalline diamond synthetic block, including pyrophyllite, the inner cavity of the pyrophyllite is wrapped with a graphite cylinder, the inner cavity of the graphite cylinder is provided with a graphite core, the surface of the graphite core is sleeved with a first insulating tube, the surface of the first insulating tube is sleeved with a heating tube, the surface of the heating tube is sleeved with a second insulating tube, and the second insulating tube is disposed in the inner cavity of the graphite cylinder.

[0006] Preferably, both the graphite cylinder and the graphite core are made of graphite, and the heating element is made of an iron-based alloy.

[0007] Preferably, a second metal coating is provided between the pyrophyllite and the graphite cylinder, and a first metal coating is provided between the graphite core and the first insulating tube.

[0008] Preferably, both the first and second insulating tubes are made of a mixture of sodium chloride and zirconium dioxide, and both the second and first metal coatings are made of nickel.

[0009] The advantages of this utility model are: This invention utilizes a heating element located inside a graphite cylinder, allowing heat to be conducted both internally and externally simultaneously. The presence of a first and second insulating tube separates the heating element, ensuring stable operation at high temperatures. This improves overall insulation performance and thermal conductivity. It also solves the problem of placing the heating element on the outermost edge of the graphite core, which, due to the low thermal conductivity of dolomite and iron, leads to reduced heat transfer efficiency and a potential drop in the internal temperature of the graphite core below the required synthesis threshold. This results in overheating on the outside and excessively low temperature inside, negatively impacting the polycrystalline diamond synthesis efficiency. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the structure of the graphite cylinder of this utility model; Figure 3 This utility model Figure 2 A magnified view of a portion of point A in the middle; Figure 4 This utility model Figure 2 A magnified view of a portion of point B in the middle.

[0012] In the figure: 1. Pyrophyllite; 2. Graphite cylinder; 3. Graphite core; 4. First insulating tube; 5. Heating tube; 6. Second insulating tube; 7. Second metal coating; 8. First metal coating. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0014] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail. This application discloses an assembly structure for a polycrystalline diamond composite block. (Refer to...) Figure 1 and Figure 2 An assembly structure for a polycrystalline diamond composite block includes pyrophyllite 1, a graphite cylinder 2 encased in the inner cavity of pyrophyllite 1, a graphite core 3 disposed in the inner cavity of graphite cylinder 2, a first insulating tube 4 sleeved on the surface of graphite core 3, a heating tube 5 sleeved on the surface of the first insulating tube 4, a second insulating tube 6 sleeved on the surface of the heating tube 5, and the second insulating tube 6 disposed in the inner cavity of graphite cylinder 2.

[0015] Reference Figure 2 Both the graphite cylinder 2 and the graphite core 3 are made of graphite, while the heating tube 5 is made of iron-based alloy. The graphite cylinder 2 and the graphite core 3, made of graphite, can serve as the carbon source inside the pyrophyllite 1 and act as a pressure transmission medium. Under high pressure, they can slip and deform, uniformly transmitting external pressure to the synthesis area and ensuring that the pyrophyllite 1 grows uniformly in three-dimensional space. The heating tube 5, made of iron-based alloy, contains chromium, molybdenum, and titanium to optimize resistivity and high-temperature resistance, thereby ensuring the thermal conductivity of the heating tube 5.

[0016] Reference Figure 2 , Figure 3 and Figure 4 A second metal coating 7 is provided between the pyrophyllite 1 and the graphite cylinder 2, and a first metal coating 8 is provided between the graphite core 3 and the first insulating tube 4. The second metal coating 7 and the first metal coating 8 are provided to improve the electrical conductivity and thermal conductivity of the graphite cylinder 2 and the graphite core 3 and to prevent impurities from entering, so as to make the internal and external temperature fields more balanced.

[0017] Reference Figure 2 , Figure 3 and Figure 4 The first insulating tube 4 and the second insulating tube 6 are both made of a mixture of sodium chloride and zirconium dioxide. The second metal coating 7 and the first metal coating 8 are both made of nickel. The mixing ratio of the first insulating tube 4 and the second insulating tube 6, which are made of a mixture of sodium chloride and zirconium dioxide, is usually between 3.5:1.5 and 4.5:0.5, which helps to reduce temperature loss and improve the stability of the cavity under high temperature and high pressure. The second metal coating 7 and the first metal coating 8, which are made of nickel, have excellent electrical and thermal conductivity, as well as good sealing and impurity penetration resistance, which can ensure that the current is evenly distributed inside the pyrophyllite 1 and avoid local overheating or energy loss.

[0018] Working principle: A portion of the graphite cylinder 2 is separated to form a graphite core 3. A first metal coating 8 is applied to the surface of the graphite core 3. A first insulating tube 4 is then fitted over the surface of the graphite core 3. A heating tube 5 is fitted over the surface of the first insulating tube 4. A second insulating tube 6 is fitted over the surface of the heating tube 5. The graphite cylinder 2 is then fitted over the surface of the second insulating tube 6, and a second metal coating 7 is applied to the surface of the graphite cylinder 2. By adjusting the position of the heating tube 5, the situation of overheating on the outside of the graphite core and underheating on the inside when the heating tube 5 is on the outermost side is avoided. Furthermore, the first insulating tube 4 and the second insulating tube 6 act as a separator for the heating tube 5, ensuring stable operation of the heating tube 5 at high temperatures. This improves the overall insulation performance and thermal conductivity, allowing heat to spread evenly inside the pyrophyllite 1 and increasing the synthesis efficiency of the pyrophyllite 1.

[0019] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. An assembly structure for a polycrystalline diamond composite block, comprising pyrophyllite (1), characterized in that: The inner cavity of the pyrophyllite (1) is wrapped with a graphite cylinder (2), and the inner cavity of the graphite cylinder (2) is provided with a graphite core (3). A first insulating tube (4) is sleeved on the surface of the graphite core (3), a heating tube (5) is sleeved on the surface of the first insulating tube (4), and a second insulating tube (6) is sleeved on the surface of the heating tube (5). The second insulating tube (6) is located in the inner cavity of the graphite cylinder (2).

2. The assembly structure of a polycrystalline diamond composite block according to claim 1, characterized in that: The graphite cylinder (2) and the graphite core (3) are both made of graphite, and the heating tube (5) is made of iron-based alloy.

3. The assembly structure of a polycrystalline diamond composite block according to claim 1, characterized in that: A second metal coating (7) is provided between the pyrophyllite (1) and the graphite cylinder (2), and a first metal coating (8) is provided between the graphite core (3) and the first insulating tube (4).

4. The assembly structure of a polycrystalline diamond composite block according to claim 3, characterized in that: The first insulating tube (4) and the second insulating tube (6) are both made of a mixture of sodium chloride and zirconium dioxide, and the second metal coating (7) and the first metal coating (8) are both made of nickel.

Images