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Polycrystalline diamond compact and preparation method thereof

A polycrystalline diamond and composite sheet technology, which is applied in drilling equipment, earthwork drilling, drill bits, etc., can solve the problems of inability to meet actual use requirements, high cost of top hammer consumption, and low wear resistance of the polycrystalline diamond layer of the composite sheet.

Pending Publication Date: 2022-08-02
SF DIAMOND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the chamber pressure is increased to a certain level, the wear resistance of the polycrystalline diamond composite sheet will no longer be significantly improved. At this time, the anvil consumption cost of the synthetic press is also very high.
Relatively thicker diamond particles improve the impact resistance of the composite sheet to a certain extent, but the wear resistance of the obtained polycrystalline diamond layer of the composite sheet is very low, and often cannot meet the actual use requirements, and the economic benefit is poor

Method used

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  • Polycrystalline diamond compact and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The polycrystalline diamond composite sheet of this embodiment includes a cemented carbide substrate and a single-layer polycrystalline diamond layer compounded on the cemented carbide substrate, and the polycrystalline diamond layer includes polycrystalline diamond formed by combining a plurality of diamond grains with each other, The cobalt binder is present in the interstitial regions between the plurality of diamond grains.

[0039] The average grain size of the polycrystalline diamond layer was 25 μm. The coercive force of the polycrystalline diamond layer is 105Oe, and the specific saturation magnetization is 12.5G·cm 3 / g. The mass percentages of C, Co, and W elements in the polycrystalline diamond layer were detected by energy spectrum and were 92%, 5.5%, and 2.5%, respectively.

[0040] The preparation method of the polycrystalline diamond composite sheet of the present embodiment is as follows, and finally a single-layer material product is formed:

[0041]...

Embodiment 2

[0046] The polycrystalline diamond compact sheet of this embodiment has the same specification and structure as the polycrystalline diamond compact sheet of Example 1, except that the average grain size of the polycrystalline diamond layer is 10 μm. The coercive force of the polycrystalline diamond layer is 95Oe; the specific magnetic saturation intensity is 16G·cm 3 / g. The mass percentage contents of C, Co, and W elements in the polycrystalline diamond layer are 90%, 7%, and 3%, respectively.

[0047] The difference between the preparation method of the polycrystalline diamond compact sheet of the present embodiment and the method of embodiment 1 is described as follows:

[0048] (1) The diamond micropowders with particle diameters of 1 to 3 μm, 6 to 12 μm, and 16 to 30 μm are uniformly mixed in a mass ratio of 10:30:60 to obtain diamond powder.

[0049] (2) The synthesis process adopts: the sintering temperature curve is constant and the pressure is a segmented process, t...

Embodiment 3

[0052] The polycrystalline diamond composite sheet of this embodiment includes a cemented carbide substrate and first and second polycrystalline diamond layers compounded on the cemented carbide substrate. The first and second polycrystalline diamond layers are integrally formed, and the second polycrystalline diamond layer is formed integrally. The layers are bonded to the cemented carbide substrate and the first polycrystalline diamond layer is bonded to the second polycrystalline diamond layer.

[0053] see figure 1 , the cemented carbide substrate 1 is provided with a central boss 2 on one side facing the polycrystalline diamond table, the first and second polycrystalline diamond layers form a polycrystalline diamond table 3, and the polycrystalline diamond table includes a The decobalt portion 30, and the decobalt portion 31 connected to the non-decobalt portion. The non-decobalt portion 30 is an upside-down circular groove, including a groove body, the groove body has a...

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Abstract

The invention belongs to the field of diamond-containing alloys, and particularly relates to a polycrystalline diamond compact and a preparation method thereof. The polycrystalline diamond compact comprises a hard alloy substrate and a polycrystalline diamond layer compounded on the hard alloy substrate, wherein the polycrystalline diamond layer comprises polycrystalline diamond formed by mutually combining a plurality of diamond grains; the coercive force of the polycrystalline diamond layer is lt; 115Oe and / or the specific magnetic saturation is greater than 15 G.cm < 3 > / g; or the polycrystalline diamond layer comprises a cobalt-removed part and a non-cobalt-removed part, and the coercive force of the non-cobalt-removed part is lt; and / or the specific magnetic saturation is greater than 15 G.cm < 3 > / g. According to the polycrystalline diamond compact provided by the invention, products with coercive force and specific magnetic saturation strength meeting the performance are proved to have good wear resistance and impact resistance, and related products can meet the use requirements of drilling tools, wire drawing machinery and other equipment, and belong to high-quality PDC products.

Description

technical field [0001] The invention belongs to the field of diamond-containing alloys, and in particular relates to a polycrystalline diamond composite sheet and a preparation method thereof. Background technique [0002] As a super wear-resistant cutting element, polycrystalline diamond composite sheet is mainly used in drilling tools (such as cutting elements, etc.), processing equipment, bearing equipment, wire drawing machinery and other mechanical equipment. The polycrystalline diamond composite sheet is installed in the sealed cavity through the diamond particles and the cemented carbide matrix. The cemented carbide matrix contains the catalyst material cobalt, and the cobalt in the cemented carbide matrix becomes liquid when compound sintered under high pressure and high temperature conditions. Cobalt will diffuse into the diamond micropowder to fill the gaps between the diamond particles. Cobalt has good wettability, which promotes the bonding between the diamond pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F7/04B22F7/06B22F3/15B22F5/00E21B10/46
CPCB22F7/04B22F7/06B22F5/00B22F3/15E21B10/46B22F2005/001
Inventor 高上攀赵东鹏任海波高华
Owner SF DIAMOND CO LTD