Polycrystalline diamond compact substrate

Abstract

The utility model discloses a polycrystalline diamond compact base body, the upper surface of the base body is a combination surface combined with a diamond layer, the combination surface comprises a center part and an edge part, the center of the center part is provided with a circular bulge, first strip-shaped bulges are uniformly radiated outwards from the outer edge of the circular bulge, and a second strip-shaped bulge is arranged between any two first strip-shaped bulges. The second strip-shaped bulge is not in contact with the circular bulge; the outer edge of the core part is an edge part, the core part and the edge part are in arc transition, the edge part is an inclined surface with high inside and low outside, elliptical bulges are uniformly arranged on the edge part, and the outer parts of the elliptical bulges are close to the outer circle of the base body. According to the polycrystalline diamond compact, the bonding surface is optimized, the contact area of the hard alloy matrix and the diamond micro powder is increased, and the abrasion ratio, the impact resistance and the stability of the polycrystalline diamond compact are improved.

Description

Technical Field

[0001] This utility model belongs to the field of drilling equipment technology, specifically relating to a polycrystalline diamond composite substrate. Background Technology

[0002] Polycrystalline diamond composite sheets are made by sintering diamond micropowder and cemented carbide matrix under high temperature and high pressure. They have the high hardness, high wear resistance and thermal conductivity of diamond, as well as the impact toughness of cemented carbide, making them an ideal material for manufacturing cutting tools, drilling bits and other wear-resistant tools.

[0003] The use of polycrystalline diamond composite sheets in drilling requires high impact toughness and stability. The impact toughness and stability of polycrystalline diamond composite sheets are closely related to the groove structure of cemented carbide. However, the traditional polycrystalline diamond composite sheet matrix itself has design defects, which can easily lead to stress concentration and cobalt accumulation at the matrix interface. This makes the product prone to damage at the interface during actual drilling and mining, resulting in poor formation applicability, durability, and stability.

[0004] In summary, how to effectively solve the interface bonding problems caused by unreasonable interface structure design of polycrystalline diamond composite substrate during drilling and production is an urgent problem that needs to be solved by those skilled in the art. Summary of the Invention

[0005] To address the aforementioned problems in the existing technology, this utility model provides a polycrystalline diamond composite sheet matrix.

[0006] The purpose of this utility model is achieved in the following manner: a polycrystalline diamond composite substrate, the upper surface of which is a bonding surface that is combined with a diamond layer, the bonding surface including a core and an edge, a circular protrusion is provided at the center of the core, and first strip-shaped protrusions are uniformly radiated outward from the outer edge of the circular protrusion, and a second strip-shaped protrusion is provided between any two first strip-shaped protrusions, the second strip-shaped protrusions not in contact with the circular protrusion; the outer edge of the core is the edge, the core and the edge are rounded, the edge is a slope with the inner side higher than the outer side, and elliptical protrusions are uniformly provided on the edge, the outer edge of the elliptical protrusions being close to the outer circle of the substrate.

[0007] The diameter of the core is 1 / 2 to 3 / 4 of the diameter of the matrix.

[0008] The angle between the edge and the horizontal direction is 5-15°.

[0009] The circular protrusion is narrower at the top and wider at the bottom.

[0010] Both the first and second strip-shaped protrusions are narrower at the top and wider at the bottom, with one end near the edge being a sloping plane.

[0011] The elliptical protrusion is narrower at the top and wider at the bottom, with the end of the elliptical protrusion near the center being a sloping plane.

[0012] The edges of the circular protrusion, the first strip protrusion, the second strip protrusion, and the elliptical protrusion are all rounded.

[0013] Compared with the prior art, the present invention has the following advantages:

[0014] 1. The various protrusions on the bonding surface of the cemented carbide matrix increase the bonding area with the diamond micropowder, thereby enhancing the bonding strength between the cemented carbide matrix and the diamond layer.

[0015] 2. The striped protrusions form a groove structure that facilitates the diffusion of cobalt in the cemented carbide matrix. This allows cobalt to flow better along the grooves in the high-temperature liquid phase, ensuring uniform dispersion of cobalt in the matrix and preventing cobalt aggregation. This fully catalyzes diamond growth and improves product performance.

[0016] 3. During the high-temperature and high-pressure synthesis process of polycrystalline diamond composite sheets, the pressure is transmitted from the outside to the inside. This groove design adopts a low outside and high inside design, which ensures the consistency of internal and external pressure of polycrystalline diamond composite sheets. This is beneficial to the consistency of wear resistance between the outside and inside of polycrystalline diamond composite sheets and improves the wear resistance performance of the product.

[0017] 4. The substrate edge adopts an elliptical protrusion design, and the outer edge of the elliptical protrusion is close to the outer circle of the cemented carbide. This ensures that the elliptical groove of the edge of the processed polycrystalline diamond composite sheet is exposed. By observing the size and consistency of the exposed edge groove, feedback on processing defects such as concentricity and taper can be obtained. This facilitates the screening of unqualified products and ensures the stability of product quality.

[0018] 5. Based on actual usage results, this type of groove improves impact toughness by more than 30% and wear resistance by more than 20%. Attached Figure Description

[0019] Figure 1 This is a perspective view of the present invention.

[0020] Figure 2 This is a top view of the present invention.

[0021] Figure 3 This is a cross-sectional view of the present invention. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention. After reading the contents of the present invention, those skilled in the art can make various modifications or alterations to the present invention, and these equivalent forms also fall within the scope defined by the present invention.

[0023] like Figure 1 , Figure 2 and Figure 3 As shown, a polycrystalline diamond composite substrate has an upper surface that is bonded to a diamond layer. The bonding surface includes a core 1 and an edge 2. A circular protrusion 3 is provided at the center of the core 1. First strip protrusions 4 are uniformly radiated outward from the outer edge of the circular protrusion 3. A second strip protrusion 5 is provided between any two first strip protrusions 4. The second strip protrusion 5 does not contact the circular protrusion 3. The outer edge of the core 1 is the edge 2. The core 1 and the edge 2 are transitioned by an arc. The edge 2 is a sloped surface with a higher inner surface and a lower outer surface. Elliptical protrusions 6 are uniformly provided on the edge 2. The outer edge of the elliptical protrusions 6 is close to the outer circle of the substrate.

[0024] 1. Circular protrusions 3, first strip protrusions 4, second strip protrusions 5 and elliptical protrusions 6 are provided on the bonding surface of the cemented carbide matrix, which increases the bonding area with diamond micro powder and enhances the bonding strength between the cemented carbide matrix and the diamond layer.

[0025] 2. Between the first strip-shaped protrusion 4 and the second strip-shaped protrusion 5, and between two adjacent second strip-shaped protrusions 5, a strip-shaped groove structure is formed. The strip-shaped groove is conducive to the diffusion of cobalt in the cemented carbide matrix, so that cobalt can flow better along the groove in the high-temperature liquid phase state, ensuring that the cobalt in the matrix is ​​uniformly dispersed, making it difficult for cobalt to aggregate, fully catalyzing the growth of diamond, and improving product performance.

[0026] 3. During the high-temperature and high-pressure synthesis process of polycrystalline diamond composite sheets, the pressure transmission is from the outside to the inside. This groove design adopts a lower outer and higher inner design, which ensures the consistency of internal and external pressure of the polycrystalline diamond composite sheet. This is beneficial to the consistency of wear resistance between the outside and the inside of the polycrystalline diamond composite sheet, and improves the wear resistance performance of the product.

[0027] 4. The substrate edge adopts an elliptical protrusion 6 design, and the outer edge of the elliptical protrusion 6 is close to the outer circle of the cemented carbide, ensuring that the elliptical protrusion 6 is exposed on the edge of the processed polycrystalline diamond composite sheet. By observing the size and consistency of the exposed edge groove, feedback on processing defects such as concentricity and taper can be obtained, which facilitates the screening of unqualified products and ensures the stability of product quality.

[0028] In a further preferred embodiment, the diameter of the core 1 is 1 / 2 to 3 / 4 of the diameter of the matrix, and the matrix groove is a centrally symmetrical structure.

[0029] Furthermore, the angle between side 2 and the horizontal direction is 5-15°.

[0030] Furthermore, the circular protrusion 3 is narrower at the top and wider at the bottom; the first strip protrusion 4 and the second strip protrusion 5 are both narrower at the top and wider at the bottom, with the end near the edge 2 being a sloping plane; the circular protrusion 6 is narrower at the top and wider at the bottom, and the end of the elliptical protrusion 6 near the center is a sloping plane. During the high-temperature and high-pressure synthesis process, the design of the strip protrusions (narrower at the top and wider at the bottom) and the sloping plane at the end near the edge 2, the structure of the elliptical protrusion 6 (narrower at the top and wider at the bottom) and the sloping plane at the end near the center of the elliptical protrusion 6, and the structure of the circular protrusion 3 (narrower at the top and wider at the bottom) facilitates the flow of diamond powder, promotes the uniform distribution and compaction of diamond micropowder, and ensures the consistency of wear resistance and impact performance around the diamond composite sheet due to the centrally symmetrical structure of the matrix groove.

[0031] Furthermore, the edges of the circular protrusion 3, the first strip protrusion 4, the second strip protrusion 5, and the elliptical protrusion 6 are all rounded. The smooth rounded chamfer transition avoids stress concentration caused by sharp corner contact.

[0032] The above description is only a preferred embodiment of the present utility model. It should be noted that those skilled in the art can make several changes and improvements without departing from the overall concept of the present utility model, and these should also be considered within the protection scope of the present utility model.

Claims

1. A polycrystalline diamond composite substrate, wherein the upper surface of the substrate is a bonding surface that is bonded to a diamond layer, characterized in that: The mating surface includes a core (1) and an edge (2). A circular protrusion (3) is provided at the center of the core (1). A first strip protrusion (4) is uniformly radiated outward from the outer edge of the circular protrusion (3). A second strip protrusion (5) is provided between any two first strip protrusions (4). The second strip protrusion (5) does not contact the circular protrusion (3). The outer edge of the core (1) is the edge (2). The core (1) and the edge (2) are connected by a circular arc. The edge (2) is a slope with a higher inner surface and a lower outer surface. Elliptical protrusions (6) are uniformly provided on the edge (2). The outer edge of the elliptical protrusions (6) is close to the outer circle of the substrate.

2. The polycrystalline diamond composite substrate according to claim 1, characterized in that: The diameter of the core (1) is 1 / 2 to 3 / 4 of the diameter of the matrix.

3. The polycrystalline diamond composite substrate according to claim 1, characterized in that: The angle between the side (2) and the horizontal direction is 5-15°.

4. The polycrystalline diamond composite substrate according to claim 1, characterized in that: The circular protrusion (3) is narrow at the top and wide at the bottom.

5. The polycrystalline diamond composite substrate according to claim 1, characterized in that: Both the first strip protrusion (4) and the second strip protrusion (5) are narrower at the top and wider at the bottom, and the end near the edge (2) is a sloping plane.

6. The polycrystalline diamond composite substrate according to claim 1, characterized in that: The elliptical protrusion (6) is narrow at the top and wide at the bottom, and the end of the elliptical protrusion (6) near the center is a sloping plane.

7. The polycrystalline diamond composite substrate according to any one of claims 1-6, characterized in that: The edges of the circular protrusion (3), the first strip protrusion (4), the second strip protrusion (5), and the elliptical protrusion (6) are all rounded.

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