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High-impact-resistance polycrystalline diamond compact and manufacturing method thereof

A polycrystalline diamond, high impact resistance technology, used in earth-moving drilling, drill bits, drilling equipment and other directions, can solve the problem of weak impact toughness of fine-grained polycrystalline layer, achieve good bonding effect, improve impact resistance, processing The effect of manufacturing promotion

Pending Publication Date: 2022-08-05
武汉锐特金刚石有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to improve the problem of weak impact toughness of the fine-grained polycrystalline layer when the diamond composite sheet is drilled and cut, the application provides a polycrystalline diamond composite sheet with high impact resistance and its manufacturing method

Method used

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  • High-impact-resistance polycrystalline diamond compact and manufacturing method thereof
  • High-impact-resistance polycrystalline diamond compact and manufacturing method thereof
  • High-impact-resistance polycrystalline diamond compact and manufacturing method thereof

Examples

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Effect test

Embodiment 1

[0056] The embodiment of the present application discloses a high impact resistance polycrystalline diamond composite sheet. refer to figure 1 , the high impact-resistant polycrystalline diamond composite sheet includes a cemented carbide substrate 1 and a diamond layer 2, the diamond layer 2 includes a fine-grained polycrystalline layer 21 and a coarse-grained polycrystalline layer 22, and the coarse-grained polycrystalline layer 22 is columnar and located in At the central axis of the diamond layer 2, the fine-grained polycrystalline layer 21 is annularly attached to the radial peripheral side of the coarse-grained polycrystalline layer 22. flush. More specifically, the coarse-grained polycrystalline layer 22 is cylindrical, the fine-grained polycrystalline layer 21 is annular and the two are coaxial; wherein, the cross-sectional radius r of the coarse-grained polycrystalline layer 22 and the cross-sectional radius R of the diamond layer 2 are The ratio is 1 / 8 < r: R < 2 / 3...

Embodiment 2

[0084] The embodiment of the present application discloses a high impact resistance polycrystalline diamond composite sheet. refer to Figure 4 , the difference from Example 1 is that: the coarse-grained polycrystalline layer 22 is provided with at least one layer; and when the coarse-grained polycrystalline layer 22 is set to multiple layers, the coarse-grained polycrystalline layer closer to the fine-grained polycrystalline layer 21 is The average particle size of the diamond particles in 22 is smaller, only the coarse-grained polycrystalline layer 22 located in the innermost layer is in a columnar shape coaxial with the fine-grained polycrystalline layer 21, and the coarse-grained polycrystalline layers 22 of the remaining layers are all in the same shape as the fine-grained polycrystalline layer 22. The polycrystalline layer 21 is coaxial and annular. In this embodiment, the coarse-grained polycrystalline layer 22 is set to two layers, and the thickness of the columnar co...

Embodiment 3

[0087] The embodiment of the present application discloses a high impact resistance polycrystalline diamond composite sheet. refer to Figure 5 , the difference from Example 1 is that the coarse-grained polycrystalline layer 22 is in the shape of a frustum, and the inner ring wall of the fine-grained polycrystalline layer 21 is fitted with the cone surface of the coarse-grained polycrystalline layer 22 .

[0088] Therefore, when the coarse-grained polycrystalline layer is in the shape of a frustum, compared with when it is in a cylindrical shape, the contact area between the coarse-grained polycrystalline layer 22 and the fine-grained polycrystalline layer 21 is increased, so that the coarse-grained polycrystalline layer 21 is increased during sintering. The bonding effect between the polycrystalline layer 22 and the fine-grained polycrystalline layer 21 is better; at the same time, the internal stress in the fine-grained polycrystalline layer 21 is dispersed and transmitted m...

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Abstract

The invention relates to the field of superhard materials, and particularly discloses a high-impact-resistance polycrystalline diamond compact and a manufacturing method thereof.The high-impact-resistance polycrystalline diamond compact comprises a hard alloy matrix and a diamond layer, and the diamond layer comprises a fine-grained polycrystalline layer and a coarse-grained polycrystalline layer; the coarse-grained polycrystalline layer is columnar and is arranged at the central axis of the diamond layer, the fine-grained polycrystalline layer is annularly attached to the radial circumferential side of the coarse-grained polycrystalline layer, and the outer circumferential wall of the cambered surface of the fine-grained polycrystalline layer is flush with the outer circumferential wall of the cambered surface of the hard alloy base body. The coarse-grained polycrystalline layer located on the inner ring can uniformly and effectively bear the internal stress of the annular fine-grained polycrystalline layer, the phenomenon that the flaky fine-grained polycrystalline layer is cracked after being locally impacted can be effectively avoided, and the impact resistance of the diamond compact is improved while other properties are not affected and the cost is reduced.

Description

technical field [0001] The present application relates to the field of superhard materials, in particular to a high impact resistance polycrystalline diamond composite sheet and a manufacturing method thereof. Background technique [0002] Polycrystalline diamond composite sheet (referred to as "composite sheet") is a superhard material formed by sintering cemented carbide matrix and diamond powder under high temperature and high pressure, with excellent properties of high hardness and high wear resistance. Mainly used in diamond drill bits, it has been widely used in geological drilling, oil, natural gas, shale gas, coal mining and other fields. With the development of exploration and development, the performance of the composite sheet required for the design of drill bits used in complex formations has been continuously improved, especially higher requirements have been placed on the impact resistance of the composite sheet. [0003] Not only to ensure the wear resistance...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B10/46B22F5/00
CPCE21B10/46B22F5/00B22F2005/001
Inventor 贺凯李冈
Owner 武汉锐特金刚石有限公司